COAL DRY-DISTILLATION DEVICE AND MODIFIED COAL
PRODUCTION EQUIPMENT USING SAME
TECHNICAL FIELD
5 [OOOl]
The present invention relates to a coal pyrolysis device and a modified
coal production equipment that uses the coal pyrolysis device.
BACKGROUND ART
10 [0002]
Low grade coal (low rank coal) with a high moisture content such as
lignite and subbituminous coal has a low calorific content per unit weight and
therefore such coal is dried and pyrolyzed by heating and then modified so that
the surface activity is reduced in a low oxygen atmosphere, whereby the low
15 grade coal is turned into modified coal having a high calorific content per unit
weight while preventing spontaneous combustion.
[0003]
A rotary kiln-type device is known as a coal pyrolysis device for
pyrolyzing dried coal obtained by drying low grade coal. The rotary kiln-type
20 device rotatably supports an inner tube (main body trunk) inside an outer tube
(jacket) that is fixed and supported, and pyrolyzes under heat while moving and
agitating the dried coal from the one end side of the inner tube to the other end
side thereof, by rotating the inner tube when heating gas is supplied to the
interior of the outer tube (between the outer tube and the inner tube) and when
25 the dried coal is supplied from the one end side of the inner tube to the interior
thereof; so as to send out pyrolyzed coal and pyrolyzed gas from the other end
side of the inner tube.
CITATION LIST
30 Patent Literature
[0004]
Patent Document 1 : Japanese Unexamined Patent Application
Publication No. 2003-176985A
Patent Document 2: Japanese Unexamined Patent Application
35 Publication No. 2004-003738A
Patent Document 3: Japanese Unexamined Patent Application
Publication No. H10-230137A
Patent Document 4: Japanese Unexamined Patent Application
Publication (translation of PCT application) No. 2009-539605A
SUMMARY OF THE INVENTION
5 Technical Problem
[0005]
However, when the dried coal is pyrolyzed, in addition to carbon
monoxide, water vapor, tar, and the like, a pyrolyzed gas (pyrolysis gas) is also
generated containing minute amounts of mercury-based substances such as HgS
10 and HgC12 included in the dried coal.
[0 00 61
Moreover, while the inside of the inner tube (main body trunk) in the
aforementioned rotary kiln-type coal pyrolysis device is covered by the outer
tube (jacket) and the portion (middle in the axial direction) heated by the
15 heating gas is able to maintain a high temperature, a portion (other end side in
the axial direction) that protrudes from the outer tube so as not to be covered
by the outer tube and that is not heated by the heating gas has a lower
temperature.
[0007]
20 As a result, when the pyrolyzed coal and the pyrolyzed gas inside the
inner tube of the coal pyrolysis device are moved to the other end side of the
inner tube, the temperature is reduced and the mercury-based substances in the
pyrolyzed gas adhere to the pyrolyzed coal and thus the pyrolyzed coal sent
from the other end side of the inner tube has a higher concentration of mercury.
25 [0008]
Accordingly, an object of the present invention is to provide a coal
pyrolysis device that is able to suppress an increase in mercury concentration in
the generated pyrolyzed coal, and to provide a modified coal production
equipment that uses the coal pyrolysis device.
3 0
Solution to Problem
[0009]
In order to resolve the aforementioned problems, a coal pyrolysis device
according to a first invention is a rotary kiln-type coal pyrolysis device that
35 rotatably supports an inner tube inside an outer tube and that pyrolyzes under
heat while moving and agitating coal from one end side of the inner tube to
another end side thereof, by rotating the inner tube when heating gas is
supplied to an interior of the outer tube and when the coal is supplied from the
+Dm $PFU MT ? G - m . 2 - ? n 4 + 71 K: 2m
. g ;- .
one end side of the inner tube to an interior thereof, so as to send out pyrolyzed
coal and pyrolyzed gas from the other end side of the inner tube; the coal
pyrolysis device including: a pulverized co a1 supply means that supplies
pulverized coal having a particle diameter of less than or equal to 100 pm to
5 the interior of the inner tube, such that a volume of the pulverized coal is 1-10
wt% relative to an amount of the pyrolyzed coal sent from the other end side of
the inner tube.
[OOl 01
The coal pyrolysis device according to a second invention related to the
10 first invention, wherein the pulverized coal supply means supplies the
pulverized coal nearer the other end where a temperature reduction occurs than
the middle in the axial direction inside the inner tube.
[OOll]
The coal pyrolysis device according to a third invention related to the
15 first or second inventions, wherein an exhaust nozzle is disposed so that a distal
end thereof is positioned between the uppermost position of an opening on the
other end side of the inner tube and a surface position of a layer of the
pyrolyzed coal present in the lowest position of the opening on the other end
side of the inner tube, whereby the pyrolyzed gas is sent out from the other end
20 side of the inner tube.
[0012]
In order to solve the above problem, a modified coal production
equipment according to a fourth invention includes a coal drying means for
drying coal and the coal pyrolysis device described in any of the first to third
25 inventions for pyrolyzing dried coal dried with the coal drying means.
[00 1 31
The modified coal production equipment according to a fifth invention
related to the fourth invention, includes a pyrolyzed coal cooling means for
cooling the pyrolyzed coal pyrolyzed by the coal pyrolysis device.
30 [0014]
The modified coal production equipment according to a sixth invention
related to the fifth invention includes a deactivation treatment means for
deactivating the pyrolyzed coal cooled by the pyrolyzed coal cooling means
using an oxygen-containing gas.
35 [0015]
.The modified coal production equipment according to a seventh
invention related to the fourth invention, wherein the pulverized coal supply
,,*9 I
means supplies pulverized coal generated and recovered accompanying the
I
drying of the coal by the coal drying means.
[0016]
The modified coal production equipment according to an eighth
5 . invention related to the fifth invention, wherein the pulverized coal supply
means supplies pulverized coal that is a portion of the pyrolyzed coal cooled by
the pyrolyzed coal cooling means that is extracted and pulverized.
[00 1 71
The modified coal production equipment according to a ninth invention
10 related to the sixth invention, wherein the pulverized coal supply means I
supplies pulverized coal recovered from the oxygen-containing gas used in the
deactivation treatment of the pyrolyzed coal by the deactivation treatment
means.
15 Advantageous Effects of Invention
[0018]
According to the coal pyrolysis device and the rnodified coal production
equipment that uses the coal pyrolysis device of the present invention, because
the pulverized coal supply means supplies pulverized coal with a particle
20 diameter of less than or equal to 100 pm to the interior of the inner tube so that
the volume of the pulverized coal is 1-10 wt% relative to the amount of the
pyrolyzed coal sent from the other end side of the inner tube, when the
pulverized coal and the pyrolyzed coal are positioned toward the other end side
of the interior of the inner tube, that is, a portion in which the pulverized coal
25 and the pyrolyzed coal are not heated by the heating gas, and when the
temperature of the pulverized coal and the pyrolyzed coal is reduced, a larger
portion of the mercury-based substances in the pyrolyzed gas adheres to the I
pulverized coal than to the pyrolyzed coal because the particle diameter of the
pulverized coal is much smaller than the particle diameter of the pyrolyzed coal
30 and the surface area of the pulverized coal per unit weight is much larger than
that of the pyrolyzed coal, whereby an increase in the generated mercury
concentration in the pyrolyzed coal is suppressed.
Brief Description of Drawings
35 [0019]
FIG. 1 is a schematic configuration diagram of a first embodiment of a
modified coal production equipment according to the present invention.
;*, FIG. 2 is a schematic configuration diagram of a main portion of the coal
pyrolysis device depicted in FIG. 1.
1 FIG. 3 is a schematic configuration diagram of a'second embodiment of
the modified coal production equipment according to the invention.
5 FIG. 4 is a schematic configuration diagram of a main portion o'f the coal
pyrolysis device depicted in FIG. 3.
FIG. 5 is a schematic configuration diagram of a third embodiment of the
modified coal production equipment accordi~lgto the present invention.
I
1 FIG. 6 is a schematic configuration diagram of a fourth embodiment of
I 10 the modified coal production equipment according to the present invention.
I
FIG; 7 is a schematic configuration diagram of a main portion of the coal
pyrolysis device of a fifth embodiment of the' modified coal production
equipment according to the present invention.
FIG. 8 is a schematic configuration diagram of a waste gas treatment
15 device of a sixth embodiment of the modified coal production equipment
according to the present invention.
Description of Embodiments
[0020]
20 While embodiments of the coal pyrolysis device and the modified coal
production equipment using the same according to the present invention will be
described on the basis of the drawings, the present invention is not limited to
the following embodiments described on the basis of the drawings.
[0021]
25 (First embodiment)
A first embodiment of a coal pyrolysis device and a modified coal
production equipment using the same is described below on the basis of FIGS.
1 and 2.
[0022]
30 As illustrated in FIG. 1, a coal drying device 110, which is a coal drying
means for drying low-grade coal (low rank coal) 1 with a high water content
such as lignite or subbituminous coal, includes: a hopper 11 1 for receiving the
low grade coal 1 ; an inner tube (main body trunk) 112 that is rotatably
supported and into which the low-grade coal 1 inside the hopper 11 1 is supplied
35 from one end side (proximal end side); an outer tube (jacket) 113 fixed and
supported so as to cover an outer circumferential surface of the inner tube 112
while allowing the inner tube 112 to rotate, steam 11 that is a heating medium
being supplied to the inside (between the inner tube 11 1 and the outer tube 113)
T P ~~ F MIT - - IK I , % : 2n
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\ of the outer tube 113; and a chute 114 that is coupled to the other end side
(distal end side) of the inner tube 112 so as to allow rotation of the inner tube
11 2 and that sends out dried coal 2 so as to make the dried coal 2 fall
downward from the other end side (distal end side) of the inner tube 1 12.
5 [0023]
The distal end side of an inert gas feeding line 11 5 for feeding an inert
gas 12 such as nitrogen gas is coupled to the one end side (proximal end side)
of the inner tube 112 of the coal drying device 110. The one end side of an
exhaust line 116 for exhausting the inert gas 12 containing carbon monoxide,
10 water vapor and the like is coupled to an upper part of the chute 114. The other
end side of the exhaust line 1 16 is coupled to a cyclone separator 11 7 for
separating and recovering pulverized coal 2a from the inert gas 12, the
pulverized coal 2a being generated accompanying the drying of the low grade
coal 1.
15 [0024]
The one end side (proximal end side) of a recirculating line 11 8 having a
condenser 11 8a for separating and removing water vapor by condensing into
water 13 in the inert gas 12 in which the pulverized coal 2a is separated, is
coupled to the cyclone separator 117. The other end side (distal end side) of
20 the recirculating line 11 8 is coupled to the inert gas feeding line 11 5 in the
middle thereof.
[0025]
The lower part of the chute 114 of the coal drying device 110
communicates with the upstream side in the conveying direction of a dried coal
25 conveying line 11 9 such as a conveyor belt for conveying the dried coal 2 sent
from the chute 114. The downstream side in the conveying direction of the,
dried coal conveying line 119 communicates with a coal pyrolysis device 120
for pyrolyzing the dried coal 2.
[0026]
30 As illustrated in FIGS. 1 and 2, the coal pyrolysis device 120 includes: a
hopper 121 for receiving the dried coal 2 from the dried coal conveying line
119; an inner tube (main body trunk) 122 that is rotatably supported and into
which the dried coal 2 inside the hopper 121 is supplied from one end side
(proximal end side); an outer tube (jacket) 123 that is fixed and supported so as
35 to cover an outer circumferential surface of the inner tube 122 while allowing
the inner tube 122 to rotate and into which a heating gas 17 is supplied as a
heating medium (between the inner tube 12 1 and the outer tube 123); and a
ckte 124 hat 's cou 1 d tathelofPe? cja side (distal end side) of the inner tube
T D n nFi T - >&.-A>- Y A l k
,+>
122 so as to allow the inner tube 122 to rotate and that sends out the pyrolyzed
coal 3 so as to make the pyrolyzed coal 3 fall downward from the other end
side (distal end side) of the inner tube 122.
[0027]
5 As illustrated in FIG. 1, the one end side (proximal end side) of an
exhaust line 126 for exhausting pyrolyzed gas (pyrolysis gas) 14 such as carbon
monoxide, water vapor, and tar is coupled to an upper part of the chute 124 of
the coal pyrolysis device 120. The other end side (distal end side) of the
exhaust line 126 is coupled to a combustion furnace 1 27 into which air 1 5 and a
10 combustion improver 16 are supplied.
[0028]
An extracting line 128 that extracts from the recirculating line 11 8 a
portion of the inert gas 12 from which water 13 is removed by the recirculating
line 11 8 in the coal drying device 11 0 and that supplies the portion of the inert
15 gas 12 into the combustion furnace 127, is coupled to the combustion furnace
127. The one end side (proximal end side) of a heating gas feeding line 125 for
feeding heating gas 17 generated inside the combustion furnace 127, is coupled
to the combustion furnace 127. The other end side (distal end side) of the
heating gas feeding line 125 communicates with the inside of the outer tube
20 123.
[0029]
The lower part of the chute 124 of the coal pyrolysis device 120
communicates with a cooling device 1 30 that is a pyrolyzed coal cooling means
for cooling the pyrolyzed coal 3 sent from the chute 124. The cooling device
25 130 is provided with: a hopper 13 1 for receiving the pyrolyzed coal 3 from the
chute 124 of the coal pyrolysis device 120; an inner tube (main body trunk) 1 32
that is rotatably supported and into which the pyrolyzed coal 3 is supplied from
the hopper 13 1 from the one end side (proximal end side) and inside which
cooling water 18 is sprayed; an outer tube (jacket) 133 that is fixed and
30 supported so as to cover the outer circumferential surface of the inner tube 132
while allowing the inner tube 132 to rotate; and a chute 134 that is coupled to
the other end side (distal end side) of the inner tube 132 so as to allow the inner
tube 132 to rotate and that sends out the cooled pyrolyzed coal 3 so as to make
the cooled pyrolyzed coal 3 fall downward from the other end side (distal end
35 side) of the inner tube 132.
[003 01
The lower part of the chute 134 in the cooling device 130 communicates
with the ugstream side in t co v ying direction of a pyrolyzed coal
=ij-Bn npk MT :n.=%-n- >? m S$l t P . SO
p-( conveying line 139 such as a conveyor belt for conveying the pyrolyzed coal 3
sent from the chute 134. The downstream side in the conveying direction of
the pyrolyzed coal conveying line 139 communicates with an upper part of a
tower body 141 of a deactivation treatment device 140 that is a deactivation
5 treatment means for deactivating the pyrolyzed coal 3. An air feeding line 142
having an air blower 142a for feeding air 15 which is an oxygen-containing gas
into the tower body 14 1, is coupled to the tower body 14 1.
[003 11
Ailower part of the tower body 141 of the deactivation treatment device
10 140 communicates with a kneading device 15 1 which is a kneading means for
kneading deactivated modified coal 4 with a binder 5 such as starch and water 6.
The kneading device 15 1 communicates with a compressing device 152 which
is a compressing means for molding by compressing the modified coal 4
kneaded with the binder 5 and the water 6 into molded coal 7.
15 [0032]
The one end side (proximal end side) of a waste air line 143 for sending
out waste air 19, which is oxygen-containing air used for deactivating the
pyrolyzed coal 3, from the inside of the tower body 141 is coupled to the tower
body 141 of the deactivation treatment device 140. The other end side (distal
20 end side) of the waste air line 143 is coupled to a cyclone separator 144 for
separating and recovering pulverized coal 4a in the waste air 19.
[003 31
A lower part of the cyclone separator 144 of the deactivation treatment
device 140 communicates with a pulverized coal conveying device 17 1 for
25 conveying from the cyclone separator 144 the pulverized coal 4a separated
from the waste air 19. The first side (right side in FIG. 1) of the pulverized
coal conveying device 17 1 communicates with a recovery container 172 for
recovering the pulverized coal 4a.
[0034]
30 The second side (left side in FIG. 1) of the pulverized coal conveying
device 171 communicates with a hopper 173 for receiving the pulverized coal
4a. A lower part of the hopper 173 is coupled to the proximal end side of a
feeder 174 for sending in fixed amounts the pulverized coal 4a inside the
hopper 173. The distal end side of the feeder 174 communicates with the
3 5 hopper 12 1 of the coal pyrolysis device 120 via a conveyor 175.
100351
The one end side (proximal end side) of a waste gas line 161 having a
sending blower 161a for exhaustin waste gas 17a of the heating gas 17 from
f6)n ngSkM: r . c - F E 7 - 2 R ~ ~ I&!: rn
4% the inside of the outer tube 113, is coupled to the outer tube 113 of the coal
pyrolysis device 120. A condenser 161 b for cooling the waste gas 17a is
provided in the waste gas line 16 1.
[003 61
5 The other end side (distal end side) of the waste gas line 161
communicates with a gas receiving part of a NOx removal device 162 which is
a NOx removal means that atomizes an ammonium chloride aqueous solution
21 onto the waste gas 17a. A gas sending part of the NOx removal device 162
communicates with a gas receiving part of an electric dust collection device
10 163 which is a dust removal means for separating and removing dust and the
like from the waste gas 17a. A gas sending part of the electric dust collection
device 163 communicates with a gas receiving part of desulfurization device
164 which is a desulfurization means for blowing a calcium carbonate slurry 22
into the waste gas 17a. A gas sending part of the desulfurization device 164
15 communicates with outside the system.
[0037]
In this embodiment, the coal drying device 110 is configured by the
hopper 1 11, the inner tube 11 2, the outer tube 11 3, the chute 1 14, the inert gas
feeding line 11 5, the exhaust line 1 16, the cyclone separator 11 7, the
20 recirculating line 11 8, the dried coal conveying line 1 19, and the like; the coal
pyrolysis device 120 is configured by the hopper 121, the inner tube 122, the
outer tube 123, the chute 124, the heating gas feeding line 125, the exhaust line
126, the combustion furnace 127, the extracting line 128, and the like; the
cooling device 130 is configured by the hopper 13 1, the inner tube 132, the
25 outer tube 133, the chute 134, the dried coal conveying line 139, and the like;
the deactivation treatment device 140 is configured by the tower body 141, the
air feeding line 142, the waste air line 143, the cyclone separator 144, and the
like; a molded coal manufacturing device 150 which is a molded coal
manufacturing means is configured by the kneading device 15 1, the
30 compressing device 152, and the like; a waste gas treatment device 160 which
is a waste gas treatment means is configured by the waste gas line 161, the
NOx removal device 162, the electric dust collection device 163, the
desulfurization device 164, and the like; the pulverized coal supply device 170
which is a pulverized coal pulverized coal supply means is configured by the
35 pulverized coal conveying device 17 1, the recovery container 172, the hopper
173, the feeder 174, the conveyor 175, and the like; and the modified coal
production equipment 100 is configured by the coal drying device 1 10, the coal
sis device 120, the co lin deyi e 30, the deactivation treatment device
T D n n g ~ ~ $-' 2 -2 e s - % A
WO 20 141024504 10 PCTlJP20 131053825
1 r 140, the molded coal manufacturing device 150, the waste gas treatment device
160, the pulverized coal supply device 170, and the like.
'COO3 81
Principal operations of the above-mentioned modified coal production
5 equipment' 100 will be described first.
[0039]
When the steam 11 is supplied into the outer tube (jacket) 123 of the
coal drying device 110, the low grade coal 1 (average particle diameter:
approximately 10 mm) is put into the hopper 11 1 so that the low grade coal 1 is
10 supplied into the inner tube (main body trunk) 112, and when the inert gas 12 is
fed into the inner tube 11 2, the low grade coal 1 is moved from the one end side
to the other end side of the inner tube 112 while being agitated due to the
rotation of the inner tube 11 2 whereby the low grade coal 1 is evenly heat-dried
(approximately 150 to 200°C) to form dried coal 2 (average particle diameter:
15 approximately 5 mm), and the dried coal 2 is sent out via the chute 114 to the
dried coal conveying line 11 9 and supplied to the hopper 12 1 of the coal
pyrolysis device 120.
[0040]
The inert gas 12 (approximately 150 to 200°C) fed into the inner tube
.20 112 of'the coal drying device 110 is fed with water vapor and pulverized coal
2a (particle diameter: 100 pm or less) generated accompanying the drying of
the low grade coal 1 from the upper part of the chute 114 via the exhaust line
116 to the cyclone separator 117, and the pulverized coal 2a is separated and
then fed to the recirculating line 11 8. After the ine,rt gas 12 is cooled by the
25 condenser 11 8a so that water 13 is separated and removed, a large portion
(approximately 85%) of the inert gas 112 is returned to the inert gas feeding
line 11 5 and fed again into the inner tube 112 to be reused along with new inert
gas 12, and a portion (approximately 15%) of the inert gas 12 is fed to the
combustion furnace 127 of the coal pyrolysis device 120 via the extracting line
30 128.
[004 11
The dried coal 2 (approximately 150 to 200°C) supplied to the hopper
121 of the coal pyrolysis device 120 is fed into the inner tube (main body
trunk) 122 and moved from the one end side of the inner tube 122 to the other
35 end side while being agitated due to the rotation of the inner tube 122, whereby
the dried coal 2 is evenly pyrolyzed under heat (350 to 450°C) with the heating
gas 17 (approximately 1000 to 1100°C) fed into the outer tube (jacket) 123
from the c~mbustio fur a e 127 v i t~P heating gas feeding line 125 so as to
T p n nF\ MT ;paa.-n2-7.n?.% % & - sf5
WO 20 141024504 11 PCTlJP20131053825
I ,P: form pyrolyzed coal 3 (average particle diameter: approximately 5 mm), which
is supplied via the chute 124 into the hopper 131 of the cooling device 130.
[0042]
The pyrolyzed gas 14 (approximately 350 to 450°C) generated
5 accompanying the pyrolysis inside the. inner tube 122 of the coal pyrolysis
device 120 is fed from the upper part of the chute 124 to the combustion
furnace 127 via the exhaust line 126 and is burned along with the inert gas 12
(including carbon monoxide and the like) and air 15 (the combustion improver
16 if required) to be used in the generation of the heating gas 17.
10 [0043]
The pyrolyzed coal 3 (350 to 450°C) supplied. to the hopper 131 of the
cooling device 130 is fed into the inner tube (main body trunk) 132 and is
moved from the one end side to the other end side of the inner tube 132 while
being agitated due to the rotation of the inner tube 132, whereby the pyrolyzed
15 coal 3 is evenly cooled (approximately 50 to 60°C) due to the cooling water 18
being sprayed inside the inner tube 132, and then sent out via the chute 134 to
the pyrolyzed coal conveying line 139 to be supplied fi-om above into the tower
body 141 of the deactivation treatment device 140.
[0044]
20 The cooling water 18 sprayed inside the inner tube 132 of the cooling
device 130 is evaporated along with the cooling of the pyrolyzed coal 3 and
sent out outside the system as water vapor 20 from the top of the chute 134.
[004 51
The pyrolyzed coal 3 (approximately 50 to 60°C) supplied from above
25 into the tower body 141 of the deactivation treatment device 140 is deactivated
due to the active spots (radicals) generated during the pyrolysis reacting with
oxygen in the air 15 fed by the air blower 142a in the air feeding line 142 so as
to form modified coal 4 (average particle diameter: approximately 5 mm)
which is fed from the bottom of the tower body 141 to the kneading device 151.
30 [0046]
Waste air 19 (approximately 50 to 70°C) used in the deactivation
treatment of the pyrolyzed coal 3 inside the tower body 141 of the deactivation
treatment device 140 is fed along with pulverized coal 4a (particle diameter:
100 pm or less) generated in the deactivation treatment to the cyclone separator
35 144 via the waste air line 143, and after being separated from the pulverized
coal 4a, the waste air 19 is exhausted outside the system.
[0047]
The modified coal 4 (approximately 30°C) fed to the kneading device
15 1 is kneaded along with the binder 5 and the water 6 and then fed to the
molding device 152 to be compressed and molded to form molded coal 7.
[0048]
When the dried coal 2 is pyrolyzed during the manufacturing of the
molded coal 7 from the low grade coal 1 in this. way, gases with minute
amounts of mercury-based substances such as HgS and HgC12 are included in
the pyrolyzed gas 14.
COO491
In this case, a temperature reduction occurs in a portion (other end side
in the axial direction) of the inner tube 122 that protrudes from the outer tube
123 so as not to be covered by the outer tube 123 and that is not heated by the
heating gas 17 iil the above-mentioned rotary kiln-type coal pyrolysis device
120. Thus, conventionally, the mercury-based substances re-adhere to the
pyrolyzed coal 3 in the portion (other end side in the axial direction) of the
inner tube 122 protruding from the outer tube 123 so as not to be covered by
the outer tube 123 and thus not heated by the heating gas 17, and the mercury
concentration in the pyrolyzed coal 3 sent from the other end side of the inner
tube 122 is increased.
[0050]
In order to suppress the increase in the mercury concentration in the
pyrolyzed coal 3, the modified coal production equipment 100 according to this
embodiment that addresses this problem further operates as follows.
[005 11
The pulverized coal 4a (particle diameter: 100 pm or less) separated and
recovered in the cyclone separator 144 of the deactivation treatment device 140
is fed from the lower part of the cyclone separator 144 into the hopper 173 via
the pulverized coal conveying device 171, and is fed by the feeder 174 along
with dried coal 2 into the hopper 121 of the coal pyrolysis device 120 via the
conveyor 175 so that the volume of the pulverized coal 4a is 1-10 wt%
(preferably 3-5 wt%) relative to the amount of the pyrolyzed coal 3 sent from
the other end side of the inner tube 122 of the coal pyrolysis device 120, that is
the pyrolyzed coal 3 sent falling downward from the chute 124.
[0052]
If the amount of the pulverized coal 4a supplied from the cyclone
separator 144 into the hopper 173 is too much at this time, the pulverized coal
conveying device 171 is made to operate temporarily in the reverse direction so
n , t hdt3the ~xge_s~=pylyqiggq~a l f)qs:rqcpvered in the recovery container 172.
~ As illustrated in FIG. 2, while the pulverized coal 4a supplied to the
I hopper 121 of the coal pyrolysis device 120 in this way is fed into the inner
tube 122 along with the dried coal 2 and moved from the one end side to the
5 other end side of the inner tube 122 while floating inside the inner tube 122
accompanying the rotation of the inner tube 122, the dried coal 2 is evenly
pyrolyzed under heat (350 to 450°C) with the heating gas 17 (approximately,
1000 to 11 00°C) as described above to form pyrolyzed coal 3 and, at the same
time, the pyrolyzed gas 14 containing gas with minute amounts of a mercury-
10 based substance 23 such as HgS or HgC12 is also generated.
[0054]
When the pulverized coal 4a and the pyrolyzed coal 3 move toward the
other end side o f the inner tube 122, that is, the pulverized coal 4a and the
pyrolyzed coal 3 are positioned at the portion not heated by the heating gas 17
15 and the temperature of the pulverized coal 4a and the pyrolyzed coal 3
decreases, a larger portion of the mercury-based substance 23 in the pyrolyzed
gas 14 adheres to the pulverized coal 4a than to the pyrolyzed coal 3 because
the particle diameter (1 00 pm or less) of the pulverized coal 4a is much smaller
than the particle diameter (approximately 5 mm) of the pyrolyzed coal 3 and
20 the surface area of the pulverized coal 4a per unit weight is much larger than
that of the pyrolyzed coal 3.
[005S]
As a result, an increase in the mercury concentration of the pyrolyzed
coal 3 sent from the chute 124 of the coal pyrolysis device 120 is suppressed.
25 [0056]
Meanwhile, the pulverized coal 4a to which the mercury-based
substance 23 is adhered is fed along with the pyrolyzed gas 14 to the
combustion furnace 127, via the exhaust line 126, from the top of the chute 124
of the coal pyrolysis device 120 as illustrated in FIG. 1, whereby the pyrolyzed
30 gas 14 and the pulverized coal 4a are burned along with the inert gas 12
(including carbon monoxide and the like) and air 15 (the combustion improver
16 if required) as described above to be used in the generation of the heating
gas 17.
[0057]
35 At this time, the mercury-based substance 23 such as HgS and HgC12
adhered to the pulverized coal 4a becomes present as gaseous Hg in the heating
gas 17 (approximately 1000 to 1 100°C) due to the burning.
The waste gas 17a of the heating gas 17 used in the pyrolysis heating of
the dried coal 2 inside the inner tube 122 by being fed into the outer tube 123
of the coal drying device 120 from the combustion furnace 127 via the heating
gas feeding line 125 is exhausted from the outer tube 123 to the waste gas line
16 1, and after being cooled (approximately 3 50°C) by the condenser 1 18a, the
waste gas 17a is fed via the sending blower 161a to the NOx removal device
162.
[0059]
Nitrogen oxides such as nitric monoxide in the waste gas 17a fed to the
NOx removal device 162 are replaced by nitrogen gas and the mercury is
replaced by mercury chloride due to the ammonium chloride aqueous solution
21 being atomized (see formulas (1) and (2) below).
[0060]
4N0+4NH3+02+4N2+6H20 (1)
~ ~ + ' 1 / 2 0 2 + 2 ~ ~ 1 + ~ ~ ~ 1 + 2 ~ 2 0 (2)
[006 11
Next, dust and the like in the waste gas 17a is separated and removed in
the electric dust collection device 163 and then the waste gas 17a is fed to the
desulfurization device 164.
[0062]
The waste gas 17a fed to the desulfurization device 164 is subjected to
post-treatment so that the mercury chloride is dissolved in water and recovered
by the calcium carbonate slurry 22 being blown therein, and after sulfur oxides
such as sulfur dioxide are replaced by calcium sulfate and the like (see
formulas (3), (4), (5) below) and recovered, the waste gas 17a is exhausted
outside the system.
[0063]
HgCl+H2O+HgClaq (3)
SO2+CaCO3+l/2H20+CaSO3 1 /2H20+C02 (4)
CaS03 112H20+1/202+3/2H~0+CaS- 02~H 20 (5)
[0064]
In other words, in this embodiment, by supplying the pulverized coal 4a
(particle diameter: 100 pm or less) to the inner tube 122 so that the volume
thereof is 1- 10 wt% (preferably 3-5 wt%) relative to the amount of the
pyrolyzed coal 3 generated in the coal pyrolysis device 120, that is, the amount
of the pyrolyzed coal 3 sent from the other end side of the inner tube 122, more
of the mercury-based substance 23 in the pyrolyzed gas 14 is made to adhere to
n iFr , t ~ f u l v p & z ~ ~ ~ g a l 4 - + t,b$ss~p~yr$&0!g ed coal 3, and the pulverized coal 4a
is separated from the pyrolyzed coal 3 to be exhausted along with the pyrolyzed
gas 14.
[0065]
Therefore, according to this embodiment, an increase in the generated
mercury concentration in the pyrolyzed coal 3 to be generated can be
suppressed.
[0066]
Moreover, since unneeded pulverized coal 4a separated and recovered
from the waste air 19 sent from the tower body 141 of the deactivation
treatment device 140 is used, the suppression of the increase in the mercury
concentration in the pyrolyzed coal 3 can be realized in an extremely low-cost
and simple manner.
[0067]
The particle diameter of the pulverized coal supplied to the inner tube
122 of the coal pyrolysis device 120 needs to be set to 100 pm or less (the size
that passes through a 100 pm square mesh). The reason for this is that when
the particle diameter exceeds 100 pm, separating the pulverized coal from the
pyrolyzed coal 3 and exhausting the pulverized coal with the pyrolyzed gas 14
becomes difficult. Meanwhile, while the lower limit of the particle diameter of
the pulverized coal is not limited in particular, practical difficulties may arise if
the particle diameter is less than 10 pm and therefore is not desired.
[0068]
Moreover, the amount of the pulverized coal supplied to the inner tube
122 of the coal pyrolysis device 120 needs to be 1- 10 wt% (preferably 3-5
wt%) relative to the amount of the pyrolyzed coal 3 sent from the other end
side of the inner tube 122 in the coal pyrolysis device 120. The reason for this
is that if the amount of the pulverized coal is less than 1 wt%, the mercurybased
substance 23 in the pyrolyzed gas 14 cannot be adhered and removed
sufficiently. 1f the amount exceeds 10 wt%, an amount that exceeds the amount
required for .adhering and removing the mercury-based substance 23 in the
pyrolyzed gas 14 will be used in a wasteful manner.
[0069]
(Second embodiment)
A second embodiment of a coal pyrolysis device and a modified coal
production equipment using the same according to the present invention is
described below on the basis of FIGS. 3 and 4. Portions similar to portions in
the above-mentioned embodiment are provided with the same reference
T P ~ , n w r a l % g usB%c.l-Jn_ t$%e%p&na&i~fs&. he above-mentioned embodiment and
explanations that duplicate explanations of the above-mentioned embodiment
will be omitted.
[0070]
As illustrated in FIG. 3, the one end side (proximal end side) of a
pulverized coal feed tube 275 is coupled to the distal end side of the feeder 174.
A cariier gas feeding line 276 for supplying the inert gas 12 such as nitrogen
gas is coupled to the connecting portion of the distal end side of the feeder 174
and the pulverized coal feed tube 275. The gas sending part of the
desulfurization device 164 communicates with outside the system and is
coupled to the carrier gas feeding line 276 in the middle thereof via a return
line 277 having a return blower 277a. The other end side (distal end side),of
the pulverized coal feed tube 275 is inserted inside the other end side of the
inner tube 122 of the coal pyrolysis device 120.
[007 11
As illustrated in FIG. 4, the other end (distal end) of the pulverized coal
feed tube 275 is positioned nearer the other end where a temperature reduction
occurs more than the middle in the axial direction of the inside of the inner
tube 122 of the coal pyrolysis device 120, that is, at a boundary portion B
between a portion covered by the outer tube 123 and heated with the heating
gas 17 and the other end side of a portion not covered by the outer tube 123 and
not heated with the heating gas 17.
[0072]
In this embodiment, a pulverized coal supply device 270, which is a
pulverized coal supply means, is configured by the pulverized coal conveying
device 17 1, the recovery container 172, the hopper 173, the feeder 174, the
pulverized coal feed tube 275, the carrier gas feeding line 276, the return line
276, and the like.
[0073]
A modified coal production equipment 200 according to this
30 embodiment provided with the pulverized coal supply device 270 as described
above is able to manufacture the molded coal 7 from the low grade coal 1 by
performing the same principal operations as those performed by the modified
coal production equipment 100 in the aforementioned first embodiment.
100741
35 The waste gas 17a exhausted from the desulfurization device 164 is fed
in addition to the inert gas 12 to the carrier gas feeding line 276 by the return
blower 277a in the return line 277, and when the pulverized coal 4a (particle
n n IF: I dimeteg kO9 ,ppj ar jeLqh,iqsidqt, & e : h s ~ ~1e7r3 is fed by the feeder 174 to the
WO 20 141024504 17 PCT/JP2013/053825
'A<
' one end side (proximal end side) of the pulverized coal feed tube 275 so that
the volume of the pulverized coal 4a is 1-10 wt% (preferably 3-5 wt%) relative
to the amount of the pyrolyzed coal 3 sent from the other end side of the inner
tube 122 in the coal pyrolysis device 120, the pulverized coal 4a is carried by
5 gas flow toward the other end side (distal end side) inside the pulverized coal
feed tube 275 by a carrier gas 24 comprising the waste gas 17a and the inert gas
12, and the pulverized coal 4a is supplied without being heated by the heating
gas 17 to the boundary portion B inside the inner tube 122 of the coal pyrolysis
device 120.
10 [0075]
The pulverized coal 4a supplied to the boundary portion B without being
heated inside the inner tube 122 of the coal pyrolysis device 120 in this way is
moved from the one end side toward the other end side inside the inner tube
122 and is positioned at the boundary portion B with a temperature
15 (approximately 50°C) much lower than the temperature of the pyrolyzed coal 3
(approximately 350 to 450°C) subjected to pyrolysis under heat, whereby more
of the mercury-based substance 23 in the pyrolyzed gas 14 actively adheres to
the pulverized coal 4a than to the pyrolyzed coal 3.
[0076]
20 As a result, an increase in the mercury concentration of the pyrolyzed
coal 3 sent from the chute 124 of the coal pyrolysis device 120 is further
suppressed than in the above-mentioned embodiment.
[0077]
Therefore, an increase in the generated mercury concentration in the
25 pyrolyzed coal 3 to be generated can be further suppressed according to this
embodiment than in the above-described embodiment.
[0078]
(Third embodiment)
A third embodiment of a coal pyrolysis device and a modified coal
30 production equipment using the same according to the present invention is
described below on the basis of FIG 5. Portions similar to portions in the
previous embodiments are provided with the same reference numerals as used
in the explanations for the previous embodiments and explanations that
duplicate explanations of the previous embodiments will be omitted.
35 [0079]
As illustrated in FIG. 5, a pyrolyzed coal extracting line 37 1 for
extracting a portion of the pyrolyzed coal 3 carried'by the pyrolyzed coal
n Icwjeyiqgdindg9i~qqwqcte$ tq tfiepyrolyzed coal conveying line 139 in the
- middle thereof. The pyrolyzed coal extracting line 371 communicates with a
pyrolyzed coal conveying device 372 for conveying the pyrolyzed coal 3
extracted by the pyrolyzed coal extracting line 371. The first side (left side in
FIG. 5) of the pyrolyzed coal conveying device 372 communicates with the
5 pyrolyzed coal conveying line 139 in the middle thereof via a pyrolyzed coal
return line 373.
[0080]
The second side (right side in FIG. 5) of the pyrolyzed coal conveying
device 372 communicates with a hopper 374 for receiving the pyrolyzed coal 3.
10 A lower part of the hopper 374 is coupled to a proximal end side of a feeder
375 for sending in fixed amounts the pyrolyzed coal 3 inside the hopper 374.
The distal end side of the feeder 375 communicates with a receiving part of a
pulverizing device 376 for pulverizing (particle diameter: 100 pm or less) the
pyrolyzed coal 3. A sending part of the pulverizing device 376 communicates
15 with a receiving port of the hopper 173 via a conveyor 376.
[008 11
In this embodiment, a pulverized coal manufacturing device 370 is
configured by the.pyrolyzed coal extracting line 371, the pyrolyzed coal
conveying device 372, the pyrolyzed coal return line 373, the hopper 374, the
20 feeder 375, the pulverizing device 376, and the like, and a pulverized coal
supply means is configured by the pulverized coal supply device 270, the
pulverized coal manufacturing device 370, and the like.
[0082]
A modified coal production equipment 300 according to this
25 embodiment provided with the pulverized coal supply device 170 and the
pulverized coal manufacturing device 370, and the like as described above is
able to manufacture the molded coal 7 from the low grade coal 1 by performing
the same principal operations as those performed by the modified coal
production equipment 100 in the aforementioned first embodiment.
30 [0083]
Moreover, when the amount of the pulverized coal 2a supplied to the
hopper 173 via the pulverized coal conveying device 171 from the cyclone
separator 144 in the deactivation treatment device -140 is insufficient, a portion
of the pyrolyzed coal 3 conveyed by the pyrolyzed coal conveying line 139 is
35 extracted from the pyrolyzed coal extracting line 371 and supplied to the
hopper 374 via the pyrolyzed coal conveying device 372 and fed in fixed
amounts into the pulverizing device 376 by the feeder 375, whereby the
WO 20141024504 19 PCTIJP20 131053825
pyrolyzed coal 3 is pulverized (particle diameter: 100 pm or less) to form
pulverized coal 3a which is supplied to the hopper 173.
[0084]
At this time, if the amount of coal 3 or 3a supplied to the hoppers 173 or
5 374 is excessive, the pyrolyzed coal conveying device 372 is made to operate in
the reverse direction so as to return the pyrolyzed coal 3 extracted from the
pyrolyzed coal conveying line 139 to the pyrolyzed coal conveying line 139 via
the pyrolyzed coal return line 373.
[0085]
' 10 As a result, even if the amount of the pulverized coal 3a recovered with
the cyclone separator 144 of the deactivation treatment device 140 becomes too
small, a sufficient amount of the pulverized coal 3a and 4a can be constantly
supplied to the inner tube 122 of the coal pyrolysis device 120.
[0086]
15 Thus, according to this embodiment, the same effects as the previous
embodiments can be realized and moreover the suppression of an increase in
the mercury concentration in the pyrolyzed coal 3 can be conducted in a more
stable manner than the previous embodiments.
[0087]
20 (Fourth embodiment)
A fourth embodiment of a coal pyrolysis device and a modified coal
production equipment using the same according to the present invention is
described below on the basis of FIG 6. Portions similar to portions in the
previous embodiments are provided with the same reference numerals as used
25 in the explanations for the previous embodiments and explanations that
duplicate explanations of the previous embodiments will be omitted.
[008 81
As illustrated in FIG. 6, a lower part of the cyclone separator 117 of the
coal drying device 11 0 communicates with a pulverized coal conveying device
30 471 for conveying from the cyclone separator 11 7 the pulverized coal 2a
separated from the inert gas 12. The first side (left side in FIG. 6) of the
pulverized coal conveying device 471 communicates with a recovery container
472 for recovering the pulverized coal 2a. The second side (right side in FIG.
6) of the pulverized coal conveying device 471 communicates with a hopper
35 473 for receiving the pulverized coal 2a. A lower part of the hopper 473 is
coupled to a proximal end side of a feeder 474 for sending in fixed amounts the
pulverized coal 2a inside the hopper 473. The distal end side of the feeder 474
WO 20 141024504 20 PCTIJP20131053825
;*
communicates with the dried coal conveying line 11 9 of the coal drying device
In this embodiment, a pulverized coal supply device 470 is configured
5 by the pulverized coal conveying device 471, the recovery container 472, the
hopper 473, the feeder 474, and the like, and a pulverized coal supply means is
configured by the pulverized coal supply devices 270 and 470, pulverized coal
manufacturing device 370, and the like.
[0090]
10 A modified coal production equipment 400 according to this
embodiment that configures a pulverized coal supply means with the pulverized
coal supply devices 270 and 470, the pulverized coal manufacturing device 370,
and the like as described above is able to manufacture the molded coal 7 fiom
the low grade coal 1 by performing the same principal operations as those
15 performed by the modified coal production equipment 100 in the
aforementioned first embodiment.
[0091]
Moreover, the pulverized coal 2a (particle diameter: 100 pm or less)
separated and recovered with the cyclone separator 117 of the coal drying
20 device 110 is supplied to the hopper 473 via the pulverized coal conveying
device 471, supplied in fixed amounts by the feeder 474 to the dried coal
conveying line 1 19 of the coal drying device 1 10, and supplied along with the
dried coal 2 from the hopper 121 of the coal pyrolysis device 120 into the inner
tube 122, and the pulverized coal 3a and 4a are fed in fixed amounts with the
25 feeder 174 so that the total volume of the pulverized coal 3a and 4a and the
pulverized coal 2a supplied into the inner tube 122 is 1-10 wt% (preferably 3-5
wt%) relative to the amount of the pyrolyzed coal 3 sent from the other end
side of the inner tube 122 in the coal pyrolysis device 120, and supplied into
the inner tube 122 of the coal pyrolysis device 120 via the pulverized coal feed
30 tube 275 with the carrier gas 24.
[0092]
If the amount of the pulverized coal 2a supplied from the cyclone
separator 11 7 into the hopper 473 is too much, the pulverized coal conveying
device 471 is made to operate temporarily in the reverse direction so that the
35 excess pulverized coal 2a is recovered in the recovery container 472.
[0093]
That is, an increase in mercury concentration in the pyrolyzed coal 3 is
T P n~ ~ u ~?~ z s s ~ ~ - t ~ ~ e m b ,bqy @$ isipngq& te pulverized coal 2a separated and
,&
.,' ' recovered from the inert gas 12 generated accompanying the drying of the low
grade coal 1 in the coal drying device 110.
[0094]
Thus, according to this embodiment, the same effects as the previous
5 embodiments can be realized and moreover the generated amount of the molded
coal 7 can be increased in comparison to the third embodiment described above
because a portion of the pyrolyzed coal 3 conveyed by the pyrolyzed coal
conveying line 139 is extracted and pulverized with the pulverizing device 376
so that the usage amount of the pulverized coal 3a to be replenished is reduced.
10 [0095]
(Fifth embodiment)
A fifth embodiment of a coal pyrolysis device and a modified coal
production equipment using the same according to the present invention is
described below on the basis of FIG 7. Portions similar to portions in the
15 previous embodiments are provided with the same reference numerals as used
in the explanations for the previous embodiments and explanations that
duplicate explanations of the previous embodiments will be omitted.
[0096]
As illustrated in FIG. 7, an exhaust nozzle 529 for sending out the
20 pyrolyzed gas 14 from the other end side of the inner tube 122 is provided in
the chute 124 of the coal pyrolysis device 120. The exhaust nozzle 529 is
disposed so that the proximal end side (one end side) thereof is coupled to the
proximal end side (one end side) of the exhaust line 126, and a receiving port
529a on the distal end (other end) is positioned between an uppermost position
25' DH of an opening part (port for coupling with the chute 124) 122a on the other
end side of the inner tube 122 and a surface position CF of the layer of the
pyrolyzed coal 3 present in the lowest position DL portion of an opening part
(port for coupling with the chute 124) 122a on the other end side of the inner
tube 122.
30 [0097]
A modified coal production equipment 500 according to this
embodiment provided with the coal pyrolysis device 120 having the exhaust
nozzle 529 as described above is able to manufacture the molded coal 7 from
the low grade coal 1 by performing the same principal operations as those
35 performed by the modified coal production equipment 100 in the
aforementioned first embodiment.
[0098]
At this time, the amount of the pulverized coal 2a to 4a following the
pyrolyzed coal 3 that falls inside the chute 124 can be reduced because the
receiving port 529a of the exhaust nozzle 529 is positioned between the
uppermost position DH and the surface position CF, the pulverized coal 2a to
4a floating inside the inner tube 122 is brought nearer an inflow port of the
exhaust line 126 in which the pyrolyzed gas 14 circulates at a speed faster than
the circulation speed inside the inner tube 122.
[0099]
Thus, according to this embodiment, the same effects as the previous
embodiments can be realized and moreover the suppression of an increase in
mercury concentration in the pyrolyzed coal 3 can be conducted more reliably
than the previous embodiments.
[O 1001
(Sixth embodiment)
A sixth embodiment of a coal pyrolysis device and a modified coal
production equipment using the same according to the present invention is
described below on the basis of FIG 8. Portions similar to portions in the
previous embodiments are provided with the same reference numerals as used
in the explanations for the previous embodiments and explanations that
duplicate explanations of the previous embodiments will be omitted.
[OlOl]
As illustrated in FIG. 8, a gas sending part of the NOx removal device
162 communicates with a gas receiving part of a desulfurization device 663 for
blowing a calcium hydroxide slurry 25 into the waste gas 17a. A sending part
of the desulfurization device 663 communicates with a receiving part of a bag
filter 664 for separating and removing dust and the like in the waste gas 17a. A
gas sending part of the bag filter 664 communicates with outside the system.
An activated carbon injection device 665 for injecting activated carbon 26 into
the waste gas 17a is connected between the desulfurization device 663 and the
bag filter 664.
[O 1021
That is, while the explanation was provided that the waste gas treatment
device 160 (wet desulfurization method) in the modified coal production
equipment 100, 200, 300, 400, and 500 according to the aforementioned
embodiments is used to replace nitrogen oxides such as nitric monoxide with
nitrogen gas (see formula (1)) by atomizing the ammonium chloride aqueous
solution 21 into the waste gas 17a with the NOx removal device 162, and afier
cury jscfep\3gd_ by#efpryfQori4q(see formula (2)) and after TDcn Il"b,F$E l the dust .e , >
WO 20 141024504 23 PCTlJP20131053825
,+.
I and the like is separated and removed by the electric dust collection device 163,
the calcium carbonate slurry 22 is blown into the waste gas 17a with the
desulfurization device 164 so that the mercury chloride is dissolved in water
and recovered (see formula (3)), and sulfur oxides such as sulfur dioxide are
5 recovered by being replaced by calcium sulfate and the like (see formula (4)
and (5)). However, in this embodiment, a waste gas treatment device 660 (dry
desulfurization method) is used to replace nitrogen oxides such as nitric
monoxide with nitrogen gas (see formula (1)) by atomizing the ammonium
chloride aqueous solution 21 into the waste gas 17a with the NOx removal
10 device 162, and after mercury is replaced by mercury chloride (see formula (2)),
while the sulfur oxides such as sulfur dioxide are replaced by calcium sulfate
and the like (see formulas (6) and (7) below) by blowing the calcium hydroxide
slurry 25 into the waste gas 17a with the desulfurization device 663, the
activated carbon 26 is injected into the waste gas 17a with the activated carbon
15 injection device 665 so that the mercury ch1orid.e adheres to the activated
carbon 26 whereby the calcium sulfate and the activated carbon 26 are
separated and recovered with the bag filter 664.
[0 1031
S02+Ca(OH)pCaS03 112H20+ 112H2O (6)
20 CaS03 1/2H20+ 1 /202+3/2H20+CaS04 2H20 (7)
[0 1041
Thus, according to this embodiment, the same effects as the previous
embodiments are realized.
[0 1051
25
While the modified coal production equipment 300 in which the
pulverized coal supply means is configured by the pulverized coal supply
. device 270, the pulverized coal' manufacturing device 370, and the like is
described in the above-mentioned third embodiment, as another embodiment,
3 0 for example, a pulverized coal supply means may be configured by omitting the
pulverized coal supply device 270 to supply the pulverized coal 3a obtained by
the pulverized coal manufacturing device 370 to the inner tube 122 of the coal
pyrolysis device 120 via the pulverized coal feed tube 275 or the hopper 11 1.
[O 1061
35 Moreover, while the modified coal production equipment 400 that
configures the pulverized coal supply means with the pulverized coal supply
devices 270 and 470, the pulverized coal manufacturing device 370, and the
a 8"8 liksig des,cgb_e& ip ths, HqrmenCictted;f~qrth embodiment, as another
*, embodiment, for example, the pulverized coal supply means may be configured
by omitting the pulverized coal manufacturing device 370 to supply the
pulverized coal 2a and 4a obtained with the pulverized coal supply devices 270
and 470 to the inner tube 122 of the coal pyrolysis device 120 via the
5 pulverized coal feed tube 275 or'the hopper 11 1, or the pulverized coal supply.
means may be configured by omitting the pulverized coal supply device 270 to
supply the pulverized coal 2a and 4a obtained with the pulverized coal supply
device 470 and the pulverized coal manufacturing device 370 to the inner tube
122 of the coal pyrolysis device 120 via the pulverized coal feed tube 275 or
10 the hopper 1 11, or furthermore, the pulverized coal supply means may be
configured by omitting the both pulverized coal supply device 270 and the
pulverized coal manufacturing device 370 to supply the pulverized coal 2a
obtained with the pulverized coal supply device 470 to the inner tube 122 of the
coal pyrolysis device 120 via the pulverized coal feed tube 275 or the hopper
15 111.
[O 1071
Furthermore, while in the aforementioned sixth embodiment, sulfur
oxides such as sulfur dioxide is replaced by calcium sulfate and the like by
blowing the calcium hydroxide slurry 25 into the waste gas 17a with the
20 desulfurization device 663 by connecting the activated carbon injection device
665 between the desulfurization device 663 and the bag filter 664, and then
after the activated carbon 26 are injected into the waste gas 17a with the
activated carbon injection device 665 to make the mercury chloride adheres to
the activated carbon 26, the calcium sulfate and the activated carbon 26 are
25 separated and recovered with the bag filter 664, as another embodiment for
example, the activated carbon 26 is injected into the waste gas 17a with the
activated carbon injection device 665 to make the mercury chloride adhere to
the activated carbon 26 by connecting the activated carbon injection device 665
between the NOx removal device 162 and the desulfurization device 663, and
30 then after the sulfur oxides such as sulfur dioxide are replaced by calcium
sulfate and the like by blowing the calcium hydroxide slurry 25 into the waste
gas 17a with the desulfurization device 663, the calcium sulfate' and the
activated carbon 26 are separated and recovered with the bag filter 664, or for
example, after the sulfur oxides such as sulfur dioxide are replaced by calcium
35 sulfate and the like by blowing the calcium hydroxide slurry 25 into the waste
gas 17a with the desulfurization device 663 by connecting the activated carbon
injection device 665 to the desulfurization device 663, and the activated carbon
26~+nje~t~dj~o,the2w~st;e1g7ag sw igb3he activated carbon injection device
T B n~m
WO 20 141024504 25 PCTlJP20131053825
:Y,
665 to make the mercury chloride adhere to the activated carbon 26, the
calcium sulfate and the activated carbon 26 can he separated and recovered
with the bag filter 664.
5 Industrial Applicability
[0 1081
The coal pyrolysis device and the modified coal production equipment
that uses the coal pyrolysis device according to the present invention are able
to suppress an increase in generated mercury concentration in pyrolyzed coal
10 and thus can be used in a very advantageous manner in industrial applications..
Reference Signs List
[0 1091
1 Low grade coal (low rank coal)
15 2 Dried coal
2a Pulverized coal
3 Pyrolyzed coal
3a Pulverized coal
4 Modified coal
20 4a Pulverized coal
5 Binder
6 Water
7 Molded coal
11 Steam
25 12 Inert gas
13 Water
14 Pyrolyzed gas
15 Air
16 Combustion improver
30 17 Heating gas
17a Waste gas
18 Cooling water
19 Waste air
20 Water vapor
35 21 Ammonium chloride aqueous solution
22 Calcium carbonate slurry
23 Mercury-based substance
a ~ nn~ ? 4 ~ ~ C q r & ~ g q ~ 3 X- 2K :n 2x n~
,a:, 25 Calcium hydroxide slurry
26 Activated carbon
100 Modified coal production equipment
1 10 Coal drying device
5 111 Hopper
1 12 Inner tube (main body trunk)
11 3 Outer tube (jacket)
114 Chute
115 Inert gas feeding line
10 116 Exhaust line
11 7 Cyclone separator
11 8 Recirculating line
11 8a Condenser
11 9 Dried coal conveying line
15 120 Coal pyrolysis device
121 Hopper
122 Inner tube (main body trunk)
122a Opening
123 Outer tube (jacket)
20 124 Chute
125 Heating gas feeding line
126 Exhaust line
127 Combustion furnace
128 Extracting line
25 130 Cooling device
131 Hopper
132 Inner tube
133 Outer tube
134 Chute
30 139 Pyrolyzed coal conveying line
140 Deactivation treatment device
141 Tower body
142 Air feeding line
142a Air blower
35 143 Waste air line
144 Cyclone separator
150 Molded coal manufacturing device
apn wpk15&,a ~ , ~ ! b ! % ~ e ~1,i K9 ~1s Kt !: :Kl
('1
152 Molding device
Waste gas treatment device
Waste gas line
Sending blower
Condenser
NOx removal device
Electric dust collection device
Desulfurization device
Pulverized coal supply device
Pulverized coal conveying device
Recovery container
Hopper
Feeder
Conveyor
Modified coal production equipment
Pulverized coal supply device
Pulverized coal feeding tube
Carrier gas feeding line
Return line
Return blower
Modified coal production equipment
Pulverized coal manufacturing device
Pyrolyzed coal extracting line
Pyrolyzed coal conveying device
Pyrolyzed coal return line
Hopper
Feeder
Pulverizing device
Modified coal
Pulverized coal supply device
Recovery container
Recovery container
Hopper
Feeder
Modified coal production equipment
Exhaust nozzle
Receiving port
,~h.':
' , 663 Desulfurization device
664 Bag-filter
- - - .-
665 Activated carbon injection device
'62%
/ 'T CLAIMS
[Claim 11
A rotary kiln-type coal pyrolysis device that rotatably supports an inner
tube inside an outer tube and that pyrolyzes under heat while moving and
agitating coal from one end side of the inner tube to another end side thereof by
rotating the inner tube upon heating gas being supplied to an interior of the
outer tube and upon the coal being supplied from the one end side of the inner
tube to an interior thereof, so as to send out pyrolyzed coal and pyrolyzed gas
from the other end side of the inner tube, the coal pyrolysis .device, comprising:
a pulverized coal supply means that supplies pulverized coal having a
particle diameter of less than or equal to 100 pm to the interior of the inner
tube, such that a volume of the pulverized coal is 1- 10 wt% relative to an
amount of the pyrolyzed coal sent from the other end side of the inner tube.
[Claim 21
The coal pyrolysis device according to claim 1, wherein ~
the pulverized coal supply means supplies the pulverized coal nearer the
other end where a temperature reduction occurs than a middle in an axial I
direction inside the inner tube.
[Claim 31
The coal pyrolysis device according to claim 1 or 2, wherein
an exhaust nozzle is provided so that a distal end thereof is positioned
between an uppermost position of an opening on the other end side of the inner
tube and a surface position of a layer of the pyrolyzed coal present in a lowest
position of the opening on the other end side of the inner tube so as to send out
the pyrolyzed gas from the other end side of the inner tube.
[Claim 41
A modified coal production equipment, comprising: a coal drying means
for drying coal; and
the coal pyrolysis device described in any one of claims 1 to 3 for
pyrolyzing dried coal dried with the coal drying means.
[Claim 51
The modified coal production equipment according to claim 4, further
comprising
a pyrolyzed coal cooling means for cooling the pyrolyzed coal pyrolyzed
by the coal pyrolysis device.
[Claim 61
The modified coal production equipment according to claim 5, further
+ D n ngi & ' F p r ~ & g - n , - + 1 r; 1 7 n
a deactivation treatment means for deactivating the pyrolyzed coal
cooled by the pyrolyzed coal cooling means using an oxygen-containing gas.
[Claim 71
The modified coal production equipment according to claim 4, wherein
the pulverized coal supply means supplies pulverized coal generated and
recovered accompanying the drying of,the coal by the coal drying means.
[Claim 81
The modified coal production equipment according to claim 5, wherein
the pulverized coal supply means supplies pulverized coal that is a
portion of the pyrolyzed coal cooled by the pyrolyzed coal cooling means that
is extracted and pulverized.
[Claim 91
The modified coal production equipment according to claim 6, wherein
the pulverized coal supply means supplies pulverized coal recovered
from the oxygen-containing gas used in the deactivation treatment of the
pyrolyzed coal by the deactivation treatment means.
ABSTRACT
I
A rotary kiln-type coal dry-distillation device (120) that: rotatably
u supports an inner tube (112) inside an outer tube (1 13); supplies heating gas
(17) to the interior of the outer tube (1 13); moves dried coal (2) from one end
side of the inner tube (1 12) to the other end side, and agitates and dry-distills
the dried coal (2) under'heat by supplying the dried coal (2) from the one end
side of the inner tube (112) to the interior, and rotating the inner tube (112);
sends out dry-distilled coal (3) and dry-distilled gas (14) from the other end
side of the inner tube (1 12); and has provided therein a pulverized coal supply
device (170) that supplies pulverized coal (4a) having a particle diameter of no
more than 100 pm to the interior of the inner tube (1 12), such that the volume
of the pulverized coal is 1-10 wt% relative to the amount of dry-distilled coal
(3) sent from the other end side of the inner tube (1 12). I

CERTIFICATION
I, Yasuyuki Tanaka, c/o MITSUISHI LAW & PATENT OFFICE, TAKU-Akasaka
Bldg. 4F, 4-9-6 Akasaka, Minato-ku, Tokyo Japan hereby certify that I am the
translator of the certified copy of the documents in respect of an application No.
2012-173647 for a patent filed in Japan on August 6, 2012, and certify that the
following is a true and correct translation to the best of my knowledge and belief.
Date: This 24th day of December 2014
6k 4,
r . [Document Name] Patent Application
[Code No.]
[Filing Date]
201200577
August 6, 2012
[Addressed to] Commissioner of t h e P a t e n t Office
[International Patent Classification] F23G 5/27
[Inventor]
[Address or Residence] c/o MITSUBISHI HEAVY INDUSTRIES, LTD.
16-5, Konan 2-chome, Minato-ku, Tokyo
[Name] Keiichi NAKAGAWA
[Inventor]
[Address or Residence] c/o MITSUBISHI HEAVY INDUSTRIES, LTD.
16-5, Konan 2-chome, Minato-ku, Tokyo
[Name] Setsuo OMOTO
[Inventor]
[Address or Residence] c/o MITSUBISHI HEAVY INDUSTRIES, LTD.
16-5, Konan 2-chome, Minato-ku, Tokyo
[Name] Fumiaki SAT0
[Inventor]
[Address or Residence] c/o MITSUBISHI HEAVY INDUSTRIES, LTD.
16-5, Konan 2-chome, Minato-ku, Tokyo
[Name] Katsuhiko YOKOHAMA
[Applicant for patent]
[Identification Code No.] 000006208
[Name or Appellation] MITSUBISHI HEAVY INDUSTRIES, LTD.
[Identification Code No.] 100078499
[Patent Attorney]
[Name or Appellation] Toshiro Mitsuishi
[Telephone No.] 03-3583-7058
[Identification Code No.] 230112449
[Attorney-at-law]
[Name or Appellation] Shumpei Mitsuishi
[Telephone No.] 03-3583-7058
[Identification Code No.] 100102945
[Patent Attorney]
[Name or Appellation] Yasuyuki Tanaka
[Telephone No.] 03-3583-7058
[Identification Code No.] 100120673
[Patent Attorney]
[Name or Appellation] Hiroshi Matsumoto
[Telephone No.] 03-3583-7058
[Identification Code No.] 100182224
[Patent Attorney]
[Name or Appellation] Tetsuzo Yamada
[Telephone No.] 03-3583-7058
[Indication of Charge]
[Payment Register No. ] 00007607
[Amount] Z15,OOO
[Index of Enclosed Documents]
[Enclosure]
[Enclosure]
[Enclosure]
[Enclosure]
Specification 1
Claims 1
Abstract 1
Drawings 1 -
I , .;i
[Document Name] Description
[Title of Invention] COAL DRY-DISTILLATION DEVICE AND MODIFIED
COAL PRODUCTION EQUIPMENT USING SAME
[Technical Field]
[OOO 11
The present invention relates to a coal pyrolysis device and a modified
coal production equipment that uses the coal pyrolysis device.
[Background Art]
[0002]
Low grade coal (low rank coal) with a high moisture content such as
lignite and subbituminous coal has a low calorific content per unit weight and
therefore such coal is dried and pyrolyzed by heating and then modified so that
the surface activity is reduced in a low oxygen atmosphere, whereby the low
grade coal is turned into modified coal having a high calorific content per unit
weight while preventing spontaneous combustion.
[0003]
A rotary kiln-type device is known as a coal pyrolysis device for
pyrolyzing dried coal obtained by drying low grade coal. The rotary kiln-type
device rotatably supports an inner tube (main body trunk) inside an outer tube
(jacket) that is fixed and supported, and pyrolyzes under heat while moving and
agitating the dried coal from the one end side of the inner tube to the other end
side thereof, by rotating the inner tube when heating gas is supplied to the
interior of the outer tube (between the outer tube and the inner tube) and when
the dried coal is supplied from the one end side of the inner tube to the interior
thereof; so as to send out pyrolyzed coal and pyrolyzed gas from the other end
side of the inner tube.
[Citation List]
[Patent Literatures]
[0004]
[Patent Literature 11 Japanese Unexamined Patent Application
Publication No. 2003-1 76985A
[Patent Literature 21 Japanese Unexamined Patent Application
Publication No. 2004-003738A
[Patent Literature 31 Japanese Unexamined Patent Application
Publication No. HI 0-230137A
[Patent Literature 41 Japanese Unexamined Patent Application
Publication (translation of PCT application) No. 2009-539605A
[Summary of Invention]
-~~bq-~-rrw~--~-w~~m?i-~-~r$;-rr -;"a~
1
,&,; [Technical Problem]
[0005]
However, when the dried coal is pyrolyzed, in addition to carbon
monoxide, water vapor, tar, and the like, a pyrolyzed gas (pyrolysis gas) is also
generated containing minute amounts of mercury-based substances such as HgS
and HgC12 included in the dried coal.
[0006]
Moreover, while the inside of the inner tube (main body trunk) in the
aforementioned rotary kiln-type coal pyrolysis device is covered by the outer
tube (jacket) and the portion (middle in the axial direction) heated by the
heating gas is able to maintain a high temperature, a portion (other end side in
the axial direction) that protrudes from the outer tube so as not to be covered
by the outer tube and that is not heated by the heating gas has a lower
temperature.
[0007]
As a result, when the pyrolyzed coal and the pyrolyzed gas inside the
inner tube of the coal pyrolysis device are moved to the other end side of the
I inner tube, the temperature is reduced and the mercury-based substances in the
pyrolyzed gas adhere to the pyrolyzed coal and thus the pyrolyzed coal sent
from the other end side of the inner tube has a higher concentration of mercury.
Accordingly, an object of the present invention is to provide a coal
pyrolysis device that is able to suppress an increase in mercury concentration in
the generated pyrolyzed coal, and to provide a modified coal production
equipment that uses the coal pyrolysis device.
[Solution to Problem]
[0009]
In order to resolve the aforementioned problems, a coal pyrolysis device
according to a first invention is a rotary kiln-type coal pyrolysis device that
rotatably supports an inner tube inside an outer tube and that pyrolyzes under
heat while moving and agitating coal from one end side of the inner tube to
another end side thereof, by rotating the inner tube when heating gas is
supplied to an interior of the outer tube and when the coal is supplied from the
one end side of the inner tube to an interior thereof, so as to send out pyrolyzed
coal and pyrolyzed gas from the other end side of the inner tube; the coal
pyrolysis device including: a pulverized coal supply means that supplies
pulverized coal having a particle diameter of less than or equal to 100 pm to
the interior of the inner tube, such that a volume of the pulverized coal is 1-1 0
, wt% relative to an amount of the pyrolyzed coal sent from the other end side of
t
the inner tube.
[OOl 01
1 The coal pyrolysis device according to a second invention related to the
first invention, wherein the pulverized coal supply means supplies the
pulverized coal nearer the other end where a temperature reduction occurs than
the middle in the axial direction inside the inner tube.
[OO 1 11
The coal pyrolysis device according to a third invention related to the
first or second inventions, wherein an exhaust nozzle is disposed so that a distal
end thereof is positioned between the uppermost position of an opening on the
other end side of the inner tube and a surface position of a layer of the
pyrolyzed coal present in the lowest position of the opening on the other end
side of the inner tube, whereby the pyrolyzed gas is sent out from the other end
side of the inner tube.
[0012]
In order to solve the above problem, a modified coal production
equipment according to a fourth invention includes a coal drying means for
drying coal and the coal pyrolysis device described in any of the first to third
inventions for pyrolyzing dried coal dried with the coal drying means.
[00 131
The modified coal production equipment according to a fifth invention
related to the fourth invention, includes a pyrolyzed coal cooling means for
cooling the pyrolyzed coal pyrolyzed by the coal pyrolysis device.
[00 141
The modified coal production equipment according to a sixth invention
related to the fifth invention includes a deactivation treatment means for
deactivating the pyrolyzed coal cooled by the pyrolyzed coal cooling means
using an oxygen-containing gas.
[00 1 51
The modified coal production equipment according to a seventh
invention related to the fourth invention, wherein the pulverized coal supply
means supplies pulverized coal generated and recovered accompanying the
drying of the coal by the coal drying means.
[00 161
The modified coal production equipment according to an eighth
invention related to the fifth invention, wherein the pulverized coal supply
+, means supplies pulverized coal that is a portion of the pyrolyzed coal cooled by
the pyrolyzed coal cooling means that is extracted and pulverized.
[00 171
The modified coal production equipment according to a ninth invention .
related to the sixth invention, wherein the pulverized coal supply means
supplies pulverized coal recovered from the oxygen-containing gas used in the
deactivation treatment of the pyrolyzed coal by the deactivation treatment
means.
[Advantageous Effect of Invention]
[00 1 81
According to the coal pyrolysis device and the modified coal production
equipment that uses the coal pyrolysis device of the present invention, because
the pulverized coal supply means supplies pulverized coal with a particle
diameter of less than or equal to 100 pm to the interior of the inner tube so that
the volume of the pulverized coal is 1-10 wt% relative to the amount of the
pyrolyzed coal sent from the other end side of the inner tube, when the
pulverized coal and the pyrolyzed coal are positioned toward the other end side
of the interior of the inner tube, that is, a portion in which the pulverized coal
and the pyrolyzed coal are not heated by the heating gas, and when the
temperature of the pulverized coal and the pyrolyzed coal is reduced, a larger
portion of the mercury-based substances in the pyrolyzed gas adheres to the
pulverized coal than to the pyrolyzed coal because the particle diameter of the
pulverized coal is much smaller than the particle diameter of the pyrolyzed coal
and the surface area of the pulverized coal per unit weight is much larger than
that of the pyrolyzed coal, whereby an increase in the generated mercury
concentration in the pyrolyzed coal is suppressed.
[Brief Description of Drawings]
[00 191
[FIG. 11 FIG. 1 is a schematic configuration diagram of a first embodiment
of a modified coal production equipment according to the present invention.
[FIG. 21 FIG. 2 is a schematic configuration diagram of a main portion of
the coal pyrolysis device depicted in FIG. 1.
[FIG. 31 FIG. 3 is a schematic configuration diagram of a second
embodiment of the modified coal production equipment according to the
present invention.
[FIG. 41 FIG. 4 is a schematic configuration diagram of a main portion of
the coal pyrolysis device depicted in FIG. 3.
,&I [FIG. 51 FIG. 5 is a schematic configuration diagram of a third
embodiment of the modified coal production equipment according to the
present invention.
[FIG. 61 FIG. 6 is a schematic configuration diagram of a fourth
embodiment of the modified coal production equipment according to the
present invention.
[FIG. 71 FIG. 7 is a schematic configuration diagram of a main portion of
the coal pyrolysis device of a fifth embodiment of the modified coal production
equipment according to the present invention.
[FIG. 81 FIG. 8 is a schematic configuration diagram of a waste gas
treatment device of a sixth embodiment of the modified coal production
equipment according to the present invention.
[Description of Embodiments]
[0020]
While embodiments of the coal pyrolysis device and the modified coal
production equipment using the same according to the present invention will be
described on the basis of the drawings, the present invention is not limited to
the following embodiments described on the basis of the drawings.
[002 11

A first embodiment of a coal pyrolysis device and a modified coal
production equipment using the same is described below on the basis of FIGS.
1 and 2.
[0022]
As illustrated in FIG. 1, a coal drying device 11 0, which is a coal drying
means for drying low-grade coal (low rank coal) 1 with a high water content
such as lignite or subbituminous coal, includes: a hopper 11 1 for receiving the
low grade coal 1; an inner tube (main body trunk) 112 that is rotatably
supported and into which the low-grade coal 1 inside the hopper 11 1 is supplied
from one end side (proximal end side); an outer tube (jacket) 11 3 fixed and
supported so as to cover an outer circumferential surface of the inner tube 112
while allowing the inner tube 112 to rotate, steam 11 that is a heating medium
being supplied to the inside (between the inner tube 11 1 and the outer tube 113)
of the outer tube 113; and a chute 114 that is coupled to the other end side
(distal end side) of the inner tube 11 2 so as to allow rotation of the inner tube
112 and that sends out dried coal 2 so as to make the dried coal 2 fall
downward from the other end side (distal end side) of the inner tube 112.
[0023]
- -
DWUB t B b U MU ~ Lbs. - U.U, 2 - 2 $ 4. 1 u-. . 2 P
5
e x ,
The distal end side of an inert gas feeding line 11 5 for feeding an inert
gas 12 such as nitrogen gas is coupled to the one end side (proximal end side)
of the inner tube 11 2 of the coal drying device 11 0. The one end side of an
exhaust line 116 for exhausting the inert gas 12 containing carbon monoxide,
water vapor and the like is coupled to an upper part of the chute 114. The other
end side of the exhaust line 11 6 is coupled to a cyclone separator 11 7 for
separating and recovering pulverized coal 2a from the inert gas 12, the
pulverized coal 2a being generated accompanying the drying of the low grade
coal 1.
[0024]
The one end side (proximal end side) of a recirculating line 11 8 having a
condenser 11 8a for separating and removing water vapor by condensing into
water 13 in the inert gas 12 in which the pulverized coal 2a is separated, is
coupled to the cyclone separator 117. The other end side (distal end side) of
the recirculating line 1 18 is coupled to the inert gas feeding line 11 5 in the
middle thereof.
[0025]
The lower part of the chute 114 of the coal drying device 11 0
communicates with the upstream side in the conveying direction of a dried coal
conveying line 11 9 such as a conveyor belt for conveying the dried coal 2 sent
from the chute 114. The downstream side in the conveying direction of the
dried coal conveying line 11 9 communicates with a coal pyrolysis device 120
for pyrolyzing the dried coal 2.
[0026]
As illustrated in FIGS. 1 and 2, the coal pyrolysis device 120 includes: a
hopper 121 for receiving the dried coal 2 from the dried coal conveying line
11 9; an inner tube (main body trunk) 122 that is rotatably supported and into
which the dried coal 2 inside the hopper 12 1 is supplied from one end side
(proximal end side); an outer tube (jacket) 123 that is fixed and supported so as
to cover an outer circumferential surface of the inner tube 122 while allowing
the inner tube 122 to rotate and into which a heating gas 17 is supplied as a
heating medium (between the inner tube 121 and the outer tube 123); and a
chute 124 that is coupled to the other end side (distal end side) of the inner tube
122 so as to allow the inner tube 122 to rotate and that sends out the pyrolyzed
coal 3 so as to make the pyrolyzed coal 3 fall downward from the other end
side (distal end side) of the inner tube 122.
[0027]
,+% As illustrated in FIG. 1, the one end side (proximal end side) of an
exhaust line 126 for exhausting pyrolyzed gas (pyrolysis gas) 14 such as carbon
monoxide, water vapor, and tar is coupled to an upper part of the chute 124 of
the coal pyrolysis device 120. The other end side (distal end side) of the
exhaust line 126 is coupled to a combustion furnace 127 into which air 15 and a
combustion improver 16 are supplied.
[0028]
An extracting line 128 that extracts from the recirculating line 11 8 a
portion of the inert gas 12 from which water 13 is removed by the recirculating
line 11 8 in the coal drying device 11 0 and that supplies the portion of the inert
gas 12 into the combustion furnace 127, is coupled to the combustion furnace
127. The one end side (proximal end side) of a heating gas feeding line 125 for
feeding heating gas 17 generated inside the combustion furnace 127, is coupled
to the combustion furnace 127. The other end side (distal end side) of the
heating gas feeding line 125 communicates with the inside of the outer tube
123:
[0029]
The lower part of the chute 124 of the coal pyrolysis device 120
communicates with a cooling device 130 that is a pyrolyzed coal cooling means
for cooling the pyrolyzed coal 3 sent from the chute 124. The cooling device
130 is provided with: a hopper 13 1 for receiving the pyrolyzed coal 3 from the
chute 124 of the coal pyrolysis device 120; an inner tube (main body trunk) 132
that is rotatably supported and into which the pyrolyzed coal 3 is supplied from
the hopper 13 1 from the one end side (proximal end side) and inside which
cooling water 18 is sprayed; an outer tube (jacket) 133 that is fixed and
supported so as to cover the outer circumferential surface of the inner tube 132
while allowing the inner tube 132 to rotate; and a chute 134 that is coupled to
the other end side (distal end side) of the inner tube 132 so as to allow the inner
tube 132 to rotate and that sends out the cooled pyrolyzed coal 3 so as to make
the cooled pyrolyzed coal 3 fall downward from the other end side (distal end
side) of the inner tube 132.
[0030]
The lower part of the chute 134 in the cooling device 130 communicates
with the upstream side in the conveying direction of a pyrolyzed coal
conveying line 139 such as a conveyor belt for conveying the pyrolyzed coal 3
sent from the chute 134. The downstream side in the conveying direction of
the pyrolyzed coal conveying line 139 communicates with an upper part of a
tower body 141 of a deactivation treatment device 140 that is a deactivation
-
It I t B k - I H Ii h. 1 4 : i P
7
, treatment means for deactivating the pyrolyzed coal 3. An air feeding line 142
./ .
having an air blower 142a for feeding air 15 which is an oxygen-containing gas
into the tower body 14 1, is coupled to the tower body 141.
[003 11
A lower part of the tower body 141 of the deactivation treatment device
140 communicates with a kneading device 15 1 which is a kneading means for
kneading deactivated modified coal 4 with a binder 5 such as starch and water 6.
The kneading device 15 1 communicates with a compressing device 152 which ~ is a compressing means for molding by compressing the modified coal 4
kneaded with the binder 5 and the water 6 into molded coal 7.
[0032]
The one end side (proximal end side) of a waste air line 143 for sending
out waste air 19, which is oxygen-containing air used for deactivating the
pyrolyzed coal 3, from the inside of the tower body 141 is coupled to the tower
body 141 of the deactivation treatment device 140. The other end side (distal
end side) of the waste air line 143 is coupled to a cyclone separator 144 for
separating and recovering .pulverized coal 4a in the waste air 19.
[0033]
A lower part of the cyclone separator 144 of the deactivation treatment
device 140 communicates with a pulverized coal conveying device 17 1 for
conveying from the cyclone separator 144 the pulverized coal 4a separated
from the waste air 19. The first side (right side in FIG. 1) of the pulverized
coal conveying device 17 1 communicates with a recovery container 172 for
recovering the pulverized coal 4a.
[0034]
The second side (left side in FIG. 1) of the pulverized coal conveying
device 171 communicates with a hopper 173 for receiving the pulverized coal
4a. A lower part of the hopper 173 is coupled to the proximal end side of a
feeder 174 for sending in fixed amounts the pulverized coal 4a inside the
hopper 173. The distal end side of the feeder 174 communicates with the
hopper 121 of the coal pyrolysis device 120 via a conveyor 175.
LO03 51
The one end side (proximal end side) of a waste gas line 161 having a
sending blower 16 1 a for exhausting waste gas 17a of the heating gas 17 from
the inside of the outer tube 11 3, is coupled to the outer tube 11 3 of the coal
pyrolysis device 120. A condenser 161 b for cooling the waste gas 17a is
provided in the waste gas line 16 1
;+ ,
The other end side (distal end side) of the waste gas line 161
communicates with a gas receiving part of a NOx removal device 162 which is
a NOx removal means that atomizes an ammonium chloride aqueous solution
2 1 onto the waste gas 17a. A gas sending part of the NOx removal device 162
communicates with a gas receiving part of an electric dust collection device
163 which is a dust removal means for separating and removing dust and the
like from the waste gas 17a. A gas sending part of the electric dust collection
device 163 communicates with a gas receiving part of desulfurization device
164 which is a desulfurization means for blowing a calcium carbonate slurry 22
into the waste gas 17a. A gas sending part of the desulfurization device 164
communicates with outside the system.
[003 71
In this embodiment, the coal drying device 110 is configured by the
hopper 11 1, the inner tube 112, the outer tube 11 3, the chute 114, the inert gas
feeding line 11 5, the exhaust line 1 16, the cyclone separator 1 17, the
recirculating line 11 8, the dried coal conveying line 11 9, and the like; the coal
pyrolysis device 120 is configured by the hopper 12 1, the inner tube 122, the
outer tube 123, the chute 124, the heating gas feeding line 125, the exhaust line
126, the combustion furnace 127, the extracting line 128, and the like; the
cooling device 130 is configured by the hopper 13 1, the inner tube 132, the
outer tube 133, the chute 134, the dried coal conveying line 139, and the like;
the deactivation treatment device 140 is configured by the tower body 141, the
air feeding line 142, the waste air line 143, the cyclone separator 144, and the
like; a molded coal manufacturing device 150 which is a molded coal
manufacturing means is configured by the kneading device 15 1, the
compressing device 152, and the like; a waste gas treatment device 160 which
is a waste gas treatment means is configured by the waste gas line 161, the
NOx removal device 162, the electric dust collection device 163, the
desulfurization device 164, and the like; the pulverized coal supply device 170
which is a pulverized coal pulverized coal supply means is configured by the
pulverized coal conveying device 17 1, the recovery container 172, the hopper
173, the feeder 174, the conveyor 175, and the like; and the modified coal
production equipment 100 is configured by the coal drying device 110, the coal
pyrolysis device 120, the cooling device 130, the deactivation treatment device
140, the molded coal manufacturing device 150, the waste gas treatment device
160, the pulverized coal supply device 170, and the like.
[0038]
J, Principal operations of the above-mentioned modified coal production
/
equipment 100 will be described first.
[0039]
When the steam 11 is supplied into the outer tube (jacket) 123 of the
coal drying device 110, the low grade coal 1 (average particle diameter:
approximately 10 mm) is put into the hopper 11 1 so that the low grade coal 1 is
supplied into the inner tube (main body trunk) 11 2, and when the inert gas 12 is
fed into the inner tube 112, the low grade coal 1 is moved from the one end side
to the other end side of the inner tube 112 while being agitated due to the
rotation of the inner tube 112 whereby the low grade coal 1 is evenly heat-dried
(approximately 150 to 200°C) to form dried coal 2 (average particle diameter:
approximately 5 mm), and the dried coal 2 is sent out via the chute 114 to the
dried coal conveying line 1 19 and supplied to the hopper 12 1 of the coal
pyrolysis device 120.
[0040]
The inert gas 12 (approximately 150 to 200°C) fed into the inner tube
11 2 of the coal drying device 11 0 is fed with water vapor and pulverized coal
2a (particle diameter: 100 pm or less) generated accompanying the drying of
the low grade coal 1 from the upper part of the chute 114 via the exhaust line
116 to the cyclone separator 11 7, and the pulverized coal 2a is separated and
then fed to the recirculating line 11 8. After the inert gas 12 is cooled by the
condenser 11 8a so that water 13 is separated and removed, a large portion
(approximately 85%) of the inert gas 112 is returned to the inert gas feeding
line 11 5 and fed again into the inner tube 112 to be reused along with new inert
gas 12, and a portion (approximately 15%) of the inert gas 12 is fed to the
combustion furnace 127 of the coal pyrolysis device 120 via the extracting line
128.
[004 11
The dried coal 2 (approximately 150 to 200°C) supplied to the hopper
121 of the coal pyrolysis device 120 is fed into the inner tube (main body
trunk) 122 and moved from the one end side of the inner tube 122 to the other
end side while being agitated due to the rotation of the inner tube 122, whereby
the dried coal 2 is evenly pyrolyzed under heat (350 to 450°C) with the heating
gas 17 (approximately 1000 to 11 00°C) fed into the outer tube (jacket) 123
from the combustion furnace 127 via the heating gas feeding line 125 so as to
form pyrolyzed coal 3 (average particle diameter: approximately 5 mm), which
is supplied via the chute 124 into the hopper 13 1 of the cooling device 130.
[0042]
-
i ~l-, 1a 11 unlk-n w P~ ~ g -.% u, t a - 2i.u u ib, u.4- Y Y
10
.by I' I
The pyrolyzed gas 14 (approximately 350 to 450°C) generated
accompanying the pyrolysis inside the inner tube 122 of the coal pyrolysis
device 120 is fed from the upper part of the chute 124 to the combustion
furnace 127 via the exhaust line 126 and is burned along with the inert gas 12
(including carbon monoxide and the like) and air 15 (the combustion improver
16 if required) to be used in the generation of the heating gas 17.
[0043]
The pyrolyzed coal 3 (350 to 450°C) supplied to the hopper 13 1 of the
cooling device 130 is fed into the inner tube (main body trunk) 132 and is
moved from the one end side to the other end side of the inner tube 132 while
being agitated due to the rotation of the inner tube 132, whereby the pyrolyzed
coal 3 is evenly cooled (approximately 50 to 60°C) due to the cooling water 18
being sprayed inside the inner tube 132, and then sent out via the chute 134 to
the pyrolyzed coal conveying line 139 to be supplied from above into the tower
body 14 1 of the deactivation treatment device 140.
[0044]
The cooling water 18 sprayed inside the inner tube 132 of the cooling
device 130 is evaporated along with the cooling of the pyrolyzed coal 3 and
sent out outside the system as water vapor 20 from the top of the chute 134.
[0045]
The pyrolyzed coal 3 (approximately 50 to 60°C) supplied from above
into the tower body 14 1 of the deactivation treatment device 140 is deactivated
due to the active spots (radicals) generated during the pyrolysis reacting with
oxygen in the air 15 fed by the air blower 142a in the air feeding line 142 so as
to form modified coal 4 (average particle diameter: approximately 5 mm)
which is fed from the bottom of the tower body 141 to the kneading device 15 1.
[0046]
Waste air 19 (approximately 50 to 70°C) used in the deactivation
treatment of the pyrolyzed coal 3 inside the tower body 141 of the deactivation
treatment device 140 is fed along with pulverized coal 4a (particle diameter:
100 pm or less) generated in the deactivation treatment to the cyclone separator
144 via the waste air line 143, and after being separated from the pulverized
coal 4a, the waste air 19 is exhausted outside the system.
[0047]
The modified coal 4 (approximately 30°C) fed to the kneading device
15 1 is kneaded along with the binder 5 and the water 6 and then fed to the
molding device 152 to be compressed and molded to form molded coal 7.
3- When the dried coal 2 is pyrolyzed during the manufacturing of the
molded coal 7 from the low grade coal 1 in this way, gases with minute
amounts of mercury-based substances such as HgS and HgC12 are included in
the pyrolyzed gas 14.
[0049]
In this case, a temperature reduction occurs in a portion (other end side
in the axial direction) of the inner tube 122 that protrudes from the outer tube
123 so as not to be covered by the outer tube 123 and that is not heated by the
heating gas 17 in the above-mentioned rotary kiln-type coal pyrolysis device
120. Thus, conventionally, the mercury-based substances re-adhere to the
pyrolyzed coal 3 in the portion (other end side in the axial direction) of the
inner tube 122 protruding from the outer tube 123 so as not to be covered by
the outer tube 123 and thus not heated by the heating gas 17, and the mercury
concentration in the pyrolyzed coal 3 sent from the other end side of the inner
tube 122 is increased.
[0050]
In order to suppress the increase in the mercury concentration in the
pyrolyzed coal 3, the modified coal production equipment 100 according to this
embodiment that addresses this problem further operates as follows.
[005 11
The pulverized coal 4a (particle diameter: 100 pm or less) separated and
recovered in the cyclone separator 144 of the deactivation treatment device 140
is fed from the lower part of the cyclone separator 144 into the hopper 173 via
the pulverized coal conveying device 17 1, and is fed by the feeder 174 along
with dried coal 2 into the hopper 121 of the coal pyrolysis device 120 via the
conveyor 1 75 so that the volume of the pulverized coal 4a is 1 - 10 wt%
(preferably 3-5 wt%) relative to the amount of the pyrolyzed coal 3 sent from
the other end side of the inner tube 122 of the coal pyrolysis device 120, that is
the pyrolyzed coal 3 sent falling downward from the chute 124.
[0052]
If the amount of the pulverized coal 4a supplied from the cyclone
separator 144 into the hopper 173 is too much at this time, the pulverized coal
conveying device 171 is made to operate temporarily in the reverse direction so
that the excess pulverized coal 4a is recovered in the recovery container 172.
[0053]
As illustrated in FIG. 2, while the pulverized coal 4a supplied to the
hopper 121 of the coal pyrolysis device 120 in this way is fed into the inner
tube 122 along with the dried coal 2 and moved from the one end side to the
;), other end side of the inner tube 122 while floating inside the inner tube 122 '* I
accompanying the rotation of the inner tube 122, the dried coal 2 is evenly
pyrolyzed under heat (350 to 450°C) with the heating gas 17 (approximately
1000 to 11 00°C) as described above to form pyrolyzed coal 3 and, at the same
time, the pyrolyzed gas 14 containing gas with minute amounts of a mercurybased
substance 23 such as HgS or HgC12 is also generated.
[0054]
When the pulverized coal 4a and the pyrolyzed coal 3 move toward the
other end side of the inner tube 122, that is, the pulverized coal 4a and the
pyrolyzed coal 3 are positioned at the portion not heated by the heating gas 17
and the temperature of the pulverized coal 4a and the pyrolyzed coal 3
decreases, a larger portion of the mercury-based substance 23 in the pyrolyzed
gas 14 adheres to the pulverized coal 4a than to the pyrolyzed coal 3 because
the particle diameter (100 pm or less) of the pulverized coal 4a is much smaller
than the particle diameter (approximately 5 mm) of the pyrolyzed coal 3 and
the surface area of the pulverized coal 4a per unit weight is much larger than
that of the pyrolyzed coal 3.
[0055]
As a result, an increase in the mercury concentration of the pyrolyzed
coal 3 sent from the chute 124 of the coal pyrolysis device 120 is suppressed.
[0056]
Meanwhile, the pulverized coal 4a to which the mercury-based
substance 23 is adhered is fed along with the pyrolyzed gas 14 to the
combustion furnace 127, via the exhaust line 126, from the top of the chute 124
of the coal pyrolysis device 120 as illustrated in FIG. 1, whereby the pyrolyzed
gas 14 and the pulverized coal 4a are burned along with the inert gas 12
(including carbon monoxide and the like) and air 15 (the combustion improver
16 if required) as described above to be used in the generation of the heating
gas 17.
[0057]
At this time, the mercury-based substance 23 such as HgS and HgC12
adhered to the pulverized coal 4a becomes present as gaseous Hg in the heating
gas 17 (approximately 1000 to 11 00°C) due to the burning.
[005S]
The waste gas 17a of the heating gas 17 used in the pyrolysis heating of
the dried coal 2 inside the inner tube 122 by being fed into the outer tube 123
of the coal drying device 120 from the combustion furnace 127 via the heating
gas feeding line 125 is exhausted from the outer tube 123 to the waste gas line
* WIII I B ' b . . ~ FJ-u - ' p
*n=urkk 13
:i, 161, and after being cooled (approximately 350°C) by the condenser 11 8a, the
,t-; @
waste gas 17a is fed via the sending blower 16 1 a to the NOx 'removal device
162.
[0059]
Nitrogen oxides such as nitric monoxide in the waste gas 17a fed to the
NOx removal device 162 are replaced by nitrogen gas and the mercury is
replaced by mercury chloride due to the ammonium chloride aqueous solution
21 being atomized (see formulas (1) and (2) below).
[0060]
4N0+4NH3+02+4N2+6H20 (1)
Hg+ 1 /202+2HC1+HgC1+2H20 (2)
[0061]
Next, dust and the like in the waste gas 17a is separated and removed in
the electric dust collection device 163 and then the waste gas 17a is fed to the
desulfurization device 164.
100621
The waste gas 17a fed to the desulfurization device 164 is subjected to
post-treatment so that the mercury chloride is dissolved in water and recovered
by the calcium carbonate slurry 22 being blown therein, and after sulfur oxides
such as sulfur dioxide are replaced by calcium sulfate and the like (see
formulas (3), (4), (5) below) and recovered, the waste gas 17a is exhausted
outside the system.
COO631
HgCl+H20+HgClaq (3)
S02+CaC03+1/2H20+CaS03 1/2H20+C02 (4)
CaS03 1/2H20+1/202+3/2H20+CaS042.H 20 (5)
[0064]
In other words, in this embodiment, by supplying the pulverized coal 4a
(particle diameter: 100 pm or less) to the inner tube 122 so that the volume
thereof is 1.-10 wt% (preferably 3-5 wt%) relative to the amount of the
pyrolyzed coal 3 generated in the coal pyrolysis device 120, that is, the amount
of the pyrolyzed coal 3 sent from the other end side of the inner tube 122, more
of the mercury-based substance 23 in the pyrolyzed gas 14 is made to adhere to
the pulverized coal 4a than to the pyrolyzed coal 3, and the pulverized coal 4a
is separated from the pyrolyzed coal 3 to be exhausted along with the pyrolyzed
gas 14:
[0065]
I 'b> j . Therefore, according to this embodiment, an increase in the generated
I mercury concentration in the pyrolyzed coal 3 to be generated can be
suppressed.
[0066]
Moreover, since unneeded pulverized coal 4a separated and recovered
from the waste air 19 sent from the tower body 141 of the deactivation
treatment device 140 is used, the suppression of the increase in the mercury
concentration in the pyrolyzed coal 3 can be realized in an extremely low-cost
and simple manner.
[0067]
The particle diameter of the pulverized coal supplied to the inner tube
122 of the coal pyrolysis device 120 needs to be set to 100 pm or less (the size
that passes through a 100 pm square mesh). The reason for this is that when
the particle diameter exceeds 100 pm, separating the pulverized coal from the
pyrolyzed coal 3 and exhausting the pulverized coal with the pyrolyzed gas 14
becomes difficult. Meanwhile, while the lower limit of the particle diameter of
the pulverized coal is not limited in particular, practical difficulties may arise if
the particle diameter is less than 10 pm and therefore is not desired.
[0068]
Moreover, the amount of the pulverized coal supplied to the inner tube
122 of the coal pyrolysis device 120 needs to be 1 - 10 wt% (preferably 3-5
wt%) relative to the amount of the pyrolyzed coal 3 sent from the other end
side of the inner tube 122 in the coal pyrolysis device 120. The reason for this
is that if the amount of the pulverized coal is less than 1 wt%, the mercurybased
substance 23 in the pyrolyzed gas 14 cannot be adhered and removed
sufficiently. If the amount exceeds 10 wt%, an amount that exceeds the amount
required for adhering and removing the mercury-based substance 23 in the
pyrolyzed gas 14 will be used in a wasteful manner.
[0069]
A second embodiment of a coal pyrolysis device and a modified coal
production equipment using the same according to the present invention is
described below on the basis of FIGS. 3 and 4. Portions similar to portions in
the above-mentioned embodiment are provided with the same reference
numerals as used in the explanations for the above-mentioned embodiment and
explanations that duplicate explanations of the above-mentioned embodiment
will be omitted.
[0070]
A,; As illustrated in FIG. 3, the one end side (proximal end side) of a
pulverized coal feed tube 275 is coupled to the distal end side of the feeder 174.
A carrier gas feeding line 276 for supplying the inert gas 12 such as nitrogen
gas is coupled to the connecting portion of the distal end side of the feeder 174
and the pulverized coal feed tube 275. The gas sending part of the
desulfurization device 164 communicates'with outside the system and is
coupled to the carrier gas feeding line 276 in the middle thereof via a return
line 277 having a return blower 277a. The other end side (distal end side) of
the pulverized coal feed tube 275 is inserted inside the other end side of the
inner tube 122 of the coal pyrolysis device 120.
[007 11
As illustrated in FIG. 4, the other end (distal end) of the pulverized coal
feed tube 275 is positioned nearer the other end where a temperature reduction
occurs more than the middle in the axial direction of the inside of the inner
tube 122 of the coal pyrolysis device 120, that is, at a boundary portion B
between a portion covered by the outer tube 123'and heated with the heating
gas 17 and the other end side of a portion not covered by the outer tube 123 and
not heated with the heating gas 17.
[0072]
In this embodiment, a pulverized coal supply device 270, which is a
pulverized coal supply means, is configured by the pulverized coal conveying
device 17 1, the recovery container 172, the hopper 173, the feeder 174, the
pulverized coal feed tube 275, the carrier gas feeding line 276, the return line
276, and the like.
[0073]
A modified coal production equipment 200 according to this
embodiment provided with the pulverized coal supply device 270 as described
above is able to manufacture the molded coal 7 from the low grade coal 1 by
performing the same principal operations as those performed by the modified
coal production equipment 100 in the aforementioned first embodiment.
[0074]
The waste gas 17a exhausted from the desulfurization device 164 is fed
in addition to the inert gas 12 to the carrier gas feeding line 276 by the return
blower 277a in the return line 277, and when the pulverized coal 4a (particle
diameter: 100 pm or less) inside the hopper 173 is fed by the feeder 174 to the
one end side (proximal end side) of the pulverized coal feed tube 275 so that
the volume of the pulverized coal 4a is 1-1 0 wt% (preferably 3-5 wt%) relative
to the amount of the pyrolyzed coal 3 sent from the other end side of the inner
- -
(il tube 122 in the coal pyrolysis device 120, the pulverized coal 4a is carried by
gas flow toward the other end side (distal end side) inside the pulverized coal
feed tube 275 by a carrier gas 24 comprising the wastc gas 17a and the inert gas
12, and the pulverized coal 4a is supplied' without being heated by the heating
gas 17 to the boundary portion B inside the inner tube 122 of the coal pyrolysis
device 120.
[0075]
The pulverized coal 4a supplied to the boundary portion B without being
heated inside the inner tube 122 of the coal pyrolysis device 120 in this way is
moved from the one end side toward the other end side inside the inner tube
122 and is positioned at the boundary portion B with a temperature
(approximately 50°C) much lower than the temperature of the pyrolyzed coal 3
(approximately 350 to 450°C) subjected to pyrolysis under heat, whereby more
of the mercury-based substance 23 in the pyrolyzed gas 14 actively adheres to
the pulverized coal 4a than to the pyrolyzed coal 3.
[0076]
As a result, an increase in the mercury concentration of the pyrolyzed
coal 3'sent from the chute 124 of the coal pyrolysis device 120 is further
suppressed than in the above-mentioned embodiment.
[0077]
Therefore, an increase in the generated mercury concentration in the
pyrolyzed coal 3 to be generated can be further suppressed according to this
embodiment than in the above-described embodiment.
[0078]

A third embodiment of a coal pyrolysis device and a modified coal
production equipment using the same according to the present invention is
described below on the basis of FIG 5. Portions similar to portions in the
previous embodiments are provided with the same reference numerals as used
in the explanations for the previous embodiments and explanations that
duplicate explanations of the previous embodiments will be omitted.
[0079]
As illustrated in FIG. 5, a pyrolyzed coal extracting line 371 for
extracting a portion of the pyrolyzed coal 3 carried by the pyrolyzed coal
conveying line 139 is connected to the pyrolyzed coal conveying line 139 in the
middle thereof. The pyrolyzed coal extracting line 371 communicates with a
pyrolyzed coal conveying device 372 for conveying the pyrolyzed coal 3
extracted by the pyrolyzed coal extracting line 371. The first side (left side in
r & r ~ i l s @ k i H 8 % i,i" I
;Ll FIG. 5) of the pyrolyzed coal conveying device 372 communicates with the
pyrolyzed coal conveying line 139 in the middle thereof via a pyrolyzed coal
return line 373.
[0080]
The second side (right side in FIG. 5) of the pyrolyzed coal conveying
device 372 communicates with a hopper 374 for receiving the pyrolyzed coal 3
A lower part of the hopper 374 is coupled to a proximal end side of a feeder
375 for sending in fixed amounts the pyrolyzed coal 3 inside the hopper 374.
The distal end side of the feeder 375 communicates with a receiving part of a
pulverizing device 376 for pulverizing (particle diameter: I00 pm or less) the
pyrolyzed coal 3. A sending part of the pulverizing device 376 communicates
with a receiving port of the hopper 173 via a conveyor 376.
[0081]
In this embodiment, a pulverized coal manufacturing device 370 is
configured by. the pyrolyzed coal extracting line 3 7 1, the pyrolyzed coal
conveying device 372, the pyrolyzed coal return line 373, the hopper 374, the
feeder 375, the pulverizing device 376, and the like, and a pulverized coal
supply means is configured by the pulverized coal supply device 270, the
pulverized coal manufacturing device 370, and the like.
[0082]
A modified coal production equipment 300 according to this
embodiment provided with the pulverized coal supply device 170 and the
pulverized coal manufacturing device 370, and the like as described above is
able to manufacture the molded coal 7 from the low grade coal 1 by performing
the same principal operations as those performed by the modified coal
production equipment 100 in the aforementioned first embodiment.
[0083]
Moreover, when the amount of the pulverized coal 2a supplied to the
hopper 173 via the pulverized coal conveying device 17 1 from the cyclone
separator 144 in the deactivation treatment device 140 is insufficient, a portion
of the pyrolyzed coal 3 conveyed by the pyrolyzed coal conveying line 139 is
extracted from the pyrolyzed coal extracting line 371 and supplied to the
hopper 374 via the pyrolyzed coal conveying device 372 and fed in fixed
amounts into the pulverizing device 376 by the feeder 375, whereby the
pyrolyzed coal 3 is pulverized (particle diameter: 100 pm or less) to form
pulverized coal 3a which is supplied to the hopper 173.
[0084]
- -
b,;., At this time, if the amount of coal 3 or 3a supplied to the hoppers 173 or
374 is excessive, the pyrolyzed coal conveying device 372 is made to operate in
the reverse direction so as to return the pyrolyzed coal 3 extracted from the
pyrolyzed coal conveying line 139 to the pyrolyzed coal conveying line 139 via
the pyrolyzed coal return line 373.
[OOSS]
As a result, even if the amount of the pulverized coal 3a recovered with
the cyclone separator 144 of the dea.ct.ivation treatment device 140 becomes too
small, a sufficient amount of the pulverized coal 3a and 4a can be constantly
supplied to the inner tube 122 of the coal pyrolysis device 120.
[0086]
Thus, according to this embodiment, the same effects as the previous
embodiments can be realized and moreover the suppression of an increase in
the mercury concentration in the pyrolyzed coal 3 can be conducted in a more
stable manner than the previous embodiments.
[008 71

A fifth embodiment of a coal pyrolysis device and a modified coal
production equipment using the same according to the present invention is
described below on the basis of FIG 7. Portions similar to portions in the
previous embodiments are provided with the same reference numerals as used
in the explanations for the previous embodiments and explanations that
duplicate explanations of the previous embodiments will be omitted.
[0096]
As illustrated in FIG. 7, an exhaust nozzle 529 for sending out the
pyrolyzed gas 14 from the other end side of the inner tube 122 is provided in
the chute 124 of the coal pyrolysis device 120. The exhaust nozzle 529 is
disposed so that the proximal end side (one end side) thereof is coupled to the
proximal end side (one end side) of the exhaust line 126, and a receiving port
529a on the distal end (other end) is positioned between an uppermost position
DH of an opening part (port for coupling with the chute 124) 122a on the other
end side of the inner tube 122 and a surface position CF of the layer of the
pyrolyzed coal 3 present in the lowest position DL portion of an opening part
(port for coupling with the chute 124) 122a on the other end side of the inner
tube 122.
[0097]
A modified coal production equipment 500 according to this
embodiment provided with the coal pyrolysis device 120 having the exhaust
nozzle 529 as described above is able to manufacture the molded coal 7 from
the low grade coal 1 by performing the same principal operations as those
performed by the modified coal production equipment 100 in the
aforementioned first embodiment.
[0098]
At this time, the amount of the pulverized coal 2a to 4a following the
pyrolyzed coal 3 that falls inside the chute 124 can be reduced because the
receiving port 529a of the exhaust nozzle 529 is positioned between the
- p~ ~
(i,4,a floating inside the inner tube 122 is brought nearer an inflow port of the
exhaust line 126 in which the pyrolyzed gas 14 circulates at a speed faster than
the circulation speed inside the inner tube 122.
[0099]
Thus, according to this embodiment, the same effects as the previous
embodiments can be realized and moreover the suppression of an increase in
mercury concentration in the pyrolyzed coal 3 can be conducted more reliably
than the previous embodiments.
[O 1 001

A sixth embodiment of a coal pyrolysis device and a modified coal
production equipment using the same according to the present invention is
described below on the basis of FIG 8. Portions similar to portions in the
previous embodiments are provided with the same reference numerals as used
in the explanations for the previous embodiments and explanations that
duplicate explanations of the previous embodiments will be omitted.
[OlOl]
As illustrated in FIG. 8, a gas sending part of the NOx removal device
162 communicates with a gas receiving part of a desulfurization device 663 for
blowing a calcium hydroxide slurry 25 into the waste gas 17a. A sending part
of the desulfurization device 663 communicates with a receiving part of a bag
filter 664 for separating and removing dust and the like in the waste gas 17a. A
gas sending part of the bag filter 664 communicates with outside the system.
An activated carbon injection device 665 for injecting activated carbon 26 into
the waste gas 17a is connected between the desulfurization device 663 and the
bag filter 664.
[O 1 021
That is, while the explanation was provided that the waste gas treatment
device 160 (wet desulfurization method) in the modified coal production
equipment 100, 200, 300,400, and 500 according to the aforementioned
embodiments is used to replace nitrogen oxides such as nitric monoxide with
nitrogen gas (see formula (1)) by atomizing the ammonium chloride aqueous
solution 2 1 into the waste gas 1 7a with the NOx removal device 162, and after
mercury is replaced by mercury chloride (see formula (2)) and after the dust
and the like is separated and removed by the electric dust collection device 163,
the calcium carbonate slurry 22 is blown into the waste gas 17a with the
desulfurization device 164 so that the mercury chloride is dissolved in water
and recovered (see formula (3)), and sulfur oxides such as sulfur dioxide are
$.. recovered by being replaced by calcium sulfate and the like (see formula (4)
and (5)). However, in this embodiment, a waste gas treatment device 660 (dry
desulfurization method) is used to replace nitrogen oxides such as nitric
monoxide with nitrogen gas (see formula (1)) by atomizing the ammonium
chloride aqueous solution 2 1 into the waste gas 17a with the NOx removal
device 162, and after mercury is replaced by mercury chloride (see formula (2)),
while the sulfur oxides such as sulfur dioxide are replaced by calcium sulfate
and the like (see formulas (6) and (7) below) by blowing the calcium hydroxide
slurry 25 into the waste gas 17a with the desulfurization device 663, the
activated carbon 26 is injected into the waste gas 17a with the activated carbon
injection device 665 so that the mercury chloride adheres to the activated
carbon 26 whereby the calcium sulfate and the activated carbon 26 are
separated and recovered with the bag filter 664.
[0 1031
S02+Ca(OH)2+CaS03. 1 / 2 ~ 2 0 + 1 / 2 ~ 2 0 (6)
CaS03. 1/2Hz0+1/202+3/2H20+CaS042. H20 (7)
[0 1 041
Thus, according to this embodiment, the same effects as the previous
embodiments are realized.
[0 1051

While the modified coal production equipment 300 in which the
pulverized coal supply means is configured by the pulverized coal supply
device 270, the pulverized coal manufacturing device 370, and the like is
described in the above-mentioned third embodiment, as another embodiment,
for example, a pulverized coal supply means may be configured by omitting the
pulverized coal supply device 270 to supply the pulverized coal 3a obtained by
the pulverized coal manufacturing device 370 to the inner tube 122 of the coal
pyrolysis device 120 via the pulverized coal feed tube 275 or the hopper 11 I.
[0106]
Moreover, while the modified coal production equipment 400 that
configures the pulverized coal supply means with the pulverized coal supply
devices 270 and 470, the pulverized coal manufacturing device 370, and the
like is described in the aforementioned fourth embodiment, as another
embodiment, for example, the pulverized coal supply means may be configured
by omitting the pulverized coal manufacturing device 370 to supply the
pulverized coal 2a and 4a obtained with the pulverized coal supply devices 270
b., pulverized coal feed tube 275 or the hopper 11 1, or the pulverized coal supply
means may be configured by omitting the pulverized coal supply device 270 to
supply the pulverized coal 2a and 4a obtained with the pulverized coal supply
device 470 and the pulverized coal manufacturing device 370 to the inner tube
122 of the'coal pyrolysis device 120 via the pulverized coal feed tube 275 or
the hopper 1 1 1, or furthermore, the pulverized coal supply means may be
configured by omitting the both pulverized coal supply device 270 and the
pulverized coal manufacturing device 370 to supply the pulverized coal 2a
obtained with the pulverized coal supply device 470 to the inner tube 122 of the
coal pyrolysis device 120 via the pulverized coal feed tube 275 or the hopper
111.
[0 1 071
Furthermore, while in the aforementioned sixth embodiment, sulfur
oxides such as sulfur dioxide is replaced by calcium sulfate and the like by
blowing the calcium hydroxide slurry 25 into the waste gas 17a with the
desulfurization device 663 by connecting the activated carbon injection device
665 between the desulfurization device 663 and the bag filter 664, and then
after the activated carbon 26 are injected into the waste gas 17a with the
activated carbon injection device 665 to make the mercury chloride adheres to
the activated carbon 26, the calcium sulfate' and the activated carbon 26 are
separated and recovered with the bag filter 664,. as another embodiment for
example, the activated carbon 26 is injected into the waste gas 17a with the
activated carbon injection device 665 to make the mercury chloride adhere to
the activated carbon 26 by connecting the activated carbon injection device 665
between the NOx removal device 162 and the desulfurization device 663, and
then after the sulfur oxides such as sulfur dioxide are replaced by calcium
sulfate and the like by blowing the calcium hydroxide slurry 25 into the waste
gas 17a with the desulfurization device 663, the calcium sulfate and the
activated carbon 26 are separated and recovered with the bag filter 664, or for
example, after the sulfur oxides such as sulfur dioxide are replaced by calcium
sulfate and the like by blowing the calcium hydroxide slurry 25 into the waste
gas 17a with the desulfurization device 663 by connecting the activated carbon
injection device 665 to the desulfurization device 663, and the activated carbon
26 is injected into the waste gas 17a with the activated carbon injection device
665 to make the mercury chloride adhere to the activated carbon 26, the
calcium sulfate and the activated carbon 26 can be separated and recovered
with the bag filter 664.
[Industrial Applicability]
- - 3- .b -3 - -2 B- .8 8- 11 . -4 -2 4-* '
\:bi [0108]
The coal pyrolysis device and the modified coal production equipment
that uses the coal pyrolysis device according to the present invention are able
to suppress an increase in generated mercury concentration in pyrolyzed coal
and thus can be used in a very advantageous manner in industrial applications.
[Reference Signs List]
[0 1 091
1 Low grade coal (low rank coal)
2 Dried coal
.2a Pulverized coal
3 Pyrolyzed coal
3a Pulverized coal
4 Modified coal
4a Pulverized coal
5 Binder
6 Water
7 Molded coal
11 Steam
12 Inert gas
13 Water
14 Pyrolyzed gas
15 Air.
16 Combustion improver
17 Heating gas
17a Waste gas
18 Cooling water
19 Waste air
20 Water vapor
2 1 Ammonium chloride aqueous solution
22 Calcium carbonate slurry
23 Mercury-based substance
24 Carrier gas
25 Calcium hydroxide slurry
26 Activated carbon
100 Modified coal production equipment
1 10 Coal drying device
111 Hopper
, & 3 Outer tube (jacket)
114 Chute
- - 1 15 - Inert gas feeding line
1 16 Exhaust line
1 17 Cyclone separator
11 8 Recirculating line
1 18a Condenser
1 19 Dried coal conveying line
120 Coal pyrolysis device
121 Hopper
122 Inner tube (main body trunk)
122a Opening
123 Outer tube (jacket)
124 Chute
125 Heating gas feeding line
126 Exhaust line
127 Combustion furnace
128 Extracting line
130 Cooling device
131 Hopper
132 Inner tube
133 Outer tube
134 Chute
139 Pyrolyzed coal conveying line
140 Deactivation treatment device
141 Tower body
142 Air feeding line
Air blower
Waste air line
Cyclone separator
Molded coal manufacturing device
Kneading device
Molding device
Waste gas treatment device
Waste gas line
Sending blower
Condenser
NOx removal device
I - ;$, 163 Electric dust collection device
I 164 Desulfurization device
! - - 170 Pulverized coal supply device
I 171 Pulverized coal conveying device
I 172 Recovery container
173 Hopper
174 Feeder
1 175 Conveyor
200 Modified coal production equipment
270 Pulverized coal supply device
275 Pulverized coal feeding tube
I 276 Carrier gas feeding line
277 Return line
277a Return blower
300 Modified coal production equipment
370 Pulverized coal manufacturing device
37 1 Pyrolyzed coal extracting line
372 Pyrolyzed coal conveying device
373 Pyrolyzed coal return line
374 Hopper
375 Feeder
376 Pulverizing device
400 Modified coal
470 Pulverized coal supply device
471 Recovery container
472 Recovery container
473 Hopper
474 Feeder
500 Modified coal production equipment
529 Exhaust nozzle
529a Receiving port
660 Waste gas treatment device
663 Desulfurization device
664 Bag filter
665 Activated carbon injection device
I*,,. [Document Name] Claims
[Claim 11
A rotary kiln-type coal pyrolysis device that rotatably supports an inner
tube inside an outer tube and that pyrolyzes under heat while moving and
agitating coal from one end side of the inner tube to another end side thereof by
rotating the inner tube upon heating gas being supplied to an interior of the
outer tube and upon the coal being supplied from the one end side of the inner
tube to an interior thereof, so as to send out pyrolyzed coal and pyrolyzed gas
from the other end side of the inner tube, the coal pyrolysis device, comprising:
a pulverized coal supply means that supplies pulverized coal having a
particle diameter of less than or equal to 100 pm to the interior of the inner
tube, such that a volume of the pulverized coal is 1-1 0 wt% relative to an
amount of the pyrolyzed coal sent from the other end side of the inner tube.
[Claim 21
The coal pyrolysis device according to claim 1, wherein
the pulverized coal supply means supplies the pulverized coal nearer the
other end where a temperature reduction occurs than a middle in an axial
direction inside the inner tube.
[Claim 31
The coal pyrolysis device according to claim 1 or 2, wherein
an exhaust nozzle is provided so that a distal end thereof is positioned
between an uppermost position of an opening on the other end side of the inner
tube and a surface position of a layer of the pyrolyzed coal present in a lowest
position of the opening on the other end side of the inner tube so as to send out
the pyrolyzed gas from the other end side of the inner tube.
[Claim 41
A modified coal production equipment, comprising: a coal drying means
for drying coal; and
the coal pyrolysis device described in any one of claims 1 to 3 for
pyrolyzing dried coal dried with the coal drying means.
[Claim 51
The modified coal production equipment according to claim 4, further
comprising
a pyrolyzed coal cooling means for cooling the pyrolyzed coal pyrolyzed
by the coal pyrolysis device.
[Claim 61
The modified coal production equipment according to claim 5, further
comprising
$,- - a deactivation treatment means for deactivating the pyrolyzed coal
cooled by the pyrolyzed coal cooling means using an oxygen-containing gas.
[Claim 71
The modified coal production equipment according to claim 4, wherein
the pulverized coal supply means supplies pulverized coal generated and
recovered accompanying the drying of the coal by the coal drying means.
[Claim 81
The modified coal production equipment according to claim 5, wherein
the pulverized coal supply means supplies pulverized coal that is a
portion of the pyrolyzed coal cooled by the pyrolyzed coal cooling means that
is extracted and pulverized.
[Claim 91
The modified coal production equipment according to claim 6, wherein
the pulverized coal supply means supplies pulverized coal recovered
from the oxygen-containing gas used in the deactivation treatment of the
pyrolyzed coal by the deactivation treatment means.