DESCRIPTION
TITLEOFTHE INVENTION: REFORMEDCOALPRODUCTIONEQUIPMENT, AND
METHOD FOR CONTROLLING SAME
TECHNICAL FIELD
Thepresentinventionrelatestoupgradedcoalproduction
equipment and a method f o r c o n t r o l l i n g t h e same, and is
p a r t i c u l a r l y useful when used t o upgrade c o a l of low rank
( l o w - r a n k c o a l ) , suchasbrowncoalorsubbituminouscoal, which
is porous and has a high water c o n t e n t .
BACKGROUND ART
[0002]
Coal of low rank (low-rank c o a l ) , such as brown coal or
subbituminous coal, which is porous andhas a h i g h w a t e r c o n t e n t
generates a low amount of heat per u n i t weight, and is t h e r e f o r e
dried through a h e a t i n g t r e a t m e n t t o have improved amount of
heat g e n e r a t i o n per u n i t weight.
As upgraded coal production equipment configured t o
perform such upgrade of low-rank c o a l , t h e r e is, f o r example,
equipment including: an i n d i r e c t - h e a t i n g p y r o l y s i s device
which performs p y r o l y s i s on low-rank coal by heating the
low-rank c o a l i n d i r e c t l y by use of a heating gas; and a
combustion furnace which generates t h e heating gas by
combusting a p y r o l y s i s gas generated i n t h e p y r o l y s i s device
and supplied t o t h e combustion furnace through a p y r o l y s i s gas
supply pipe.
[0004]
The p y r o l y s i s gas described above is composed of a
low-boiling component. However, s i n c e t h e low-rank coal is
processed under a r e l a t i v e l y high temperature, t h e p y r o l y s i s
gas is accompanied by t a r ( p y r o l y s i s o i l ) which i s a
high-boiling component. When t h e p y r o l y s i s gas i s cooled, t h e
t a r i s a t t a c h e d t o a wall surface of a duct o r t h e l i k e through
which t h e p y r o l y s i s gas flows. When a l a r g e amount of t a r is
attached, a problem might occur, such as clogging t h e duct.
Hence, varioustechniqueshavebeendevelopedtoremovethetar.
[0005]
For example, Patent Document 1 given below d i s c l o s e s a
decoking method f o r combusting and removing coke attached t o
t h e i n s i d e o f a pipe by use of a gas which is obtained by a d j u s t i n g
a i r t o have an oxygen concentration of 3 vol% t o 2 1 v o l % t h r o u g h
d i l u t i o n with water vapor or an i n e r t gas, and which is a l s o
adjusted t o have a temperature of 350 "C t o 500 OC.
[0006]
Patent Document 2 given below d i s c l o s e s a method f o r
performing a p y r o l y s i s t r e a t m e n t on a p r o c e s s e d o b j e c t by using
an e x t e r n a l heating k i l n . In t h i s method, an oxygen-containing
gas is supplied i n t o an inner c y l i n d e r of t h e e x t e r n a l heating
k i l n t o combust a carbide of organic matter i n t h e processed
object and/or a combustiblegas, whichareproducedbypyrolysis.
Thereby, t h e temperature of a p y r o l y s i s gas i n c r e a s e s , so t h a t
l i q u e f a c t i o n or s o l i d i f i c a t i o n is prevented.
PRIOR ART DOCUMENTS
PATENT DOCUMENTS
[0007]
Patent Document 1: Japanese P a t e n t Application Publication No.
Hei 5-188653 ( s e e , e . g . , paragraphs [0013], [0017], and t h e
l i k e )
Patent Document 2: Japanese Patent A p p l i c a t i o n P u b l i c a t i o n No.
2004-3738 (see, e-g., paragraphs [00111, [00141f [00151f and
the like)
SUMMARY OF THE INVENTION
PROBLEMS TO BE SOLVED BY THE INVENTION
[0008]
By applying the decoking method described in Patent
Document 1to the upgraded coal production equipment described
earlier to directly supply the oxygen-concentration adjusted
gas adjusted for its oxygen concentration to the pyrolysis
device described earlier, tar produced during shutdown is
combusted, sothat attachment ofthe tar tothe pyrolysis device
can be suppressed. However, generating the
oxygen-concentration adjustedgas fromair or froman inert gas
(nitrogenorwater vapor) requires an apparatus specializedfor
that, and this increases costs for producing upgraded coal.
Moreover, the oxygen-concentration adjusted gas has to be
increased in temperature in advance in order for it to react
with the tar. Thus, additional energy is needed. In sum, the
tar cannot be removed efficiently.
[0009]
In the method for performing a pyrolysis treatment on a
processed object by using an external heating kiln described
in Patent Document 2, the carbide itself of organic matter in
the processed object produced by the pyrolysis is combusted.
Thus, when this method is applied to the upgraded coal
production equipment, coal has to be supplied to the pyrolysis
device alsoduringshutdownofthe equipmentto combust the coal
itself. This entails lower production volume of the upgraded
coal.
[OOlO]
In view of t h e above, t h e p r e s e n t i n v e n t i o n has been made
t o solve t h e problems described above, and has an o b j e c t i v e of
providing upgraded coal production equipment and a c o n t r o l l i n g
method f o r t h e same, capable of e f f i c i e n t t a r removal without
loweringtheproductionvolumeofupgradedcoaleveninshutting
down t h e equipment.
MEANS FOR SOLVING THE PROBLEMS
[0011]
Upgraded coal production equipment according t o a f i r s t
aspect of t h e invention f o r solving t h e above problems is
upgraded coal production equipmentwhich includes dryingmeans
f o r drying c o a l , p y r o l y s i s means f o r performing p y r o l y s i s on
t h e d r i e d c o a l , andcoolingmeans f o r cooling t h e coal subjected
t o t h e p y r o l y s i s , t h e p y r o l y s i s m e a n s being anindirect-heating
p y r o l y s i s device having an i n n e r c y l i n d e r i n t o which t h e d r i e d
coal is t r a n s f e r r e d and an o u t e r c y l i n d e r supplied with a
heating gas f o r heating t h e i n n e r c y l i n d e r , and which is
characterized i n t h a t t h e equipment comprises: heating gas
generation means f o r generating t h e heating gas; p y r o l y s i s gas
supplymeans f o r s u p p l y i n g t h e h e a t i n g g a s generationmeanswith
a p y r o l y s i s gas g e n e r a t e d i n t h e i n n e r c y l i n d e r ; waste-heat gas
generation means f o r r e c e i v i n g supply of p a r t of t h e heating
gas generatedintheheatinggasgenerationmeans andgenerating
awaste-heat gas by subjectingtheheatinggasto heat exchange;
and mixed gas d i s t r i b u t i o n supply means f o r d i s t r i b u t i n g and
supplying, t o t h e i n n e r c y l i n d e r , t h e waste-heat gas and a
low-temperature heating g a s generated when t h e heating gas
heats t h e coal i n d i r e c t l y i n s i d e t h e o u t e r c y l i n d e r .
[0012]
Upgraded coal production equipment according t o a second
aspect of the invention for solving the above problems is the
upgraded coal production equipment according to the first
aspect of the invention described above, characterizedinthat
the mixed gas distribution supply means is connected to the
inner cylinder at an inlet side of the inner cylinder which
receives the dried coal.
[0013]
Upgraded coal production equipment according to a third
aspect of the invention for solving the above problems is the
upgraded coal production equipment according to the second
aspect of the invention described above, characterized in that
the indirect-heatingpyrolysis device includes gas temperature
measurement means for measuring a gas temperature, the gas
temperature measurement means being provided at an outlet side
from which the dried coal is discharged, and the mixed gas
distribution supply means includes: gas flow rate adjustment
means for adjusting a flow rate of the low-temperature heating
gas and the waste-heat gas supplied to the inner cylinder; and
controlmeans for controlling the gas flow rate adjustment means
based on the gas temperature measured by the gas temperature
measurement means.
[0014]
Upgraded coal production equipment according to a fourth
aspect of the invention for solving the above problems is the
upgraded coal production equipment according to the third
aspect of the invention described above, characterizedin that
the equipment comprises a plurality of equipment main bodies
being arranged in parallel and each having the drying means,
the indirect-heating pyrolysis device, and the cooling means.
[0015]
A method for controlling upgraded coal production
equipment according to a fifth aspect of the invention for
solving the above problems is a method for controlling the
upgraded coal production equipment according to the third
aspect of the invention described above, characterized in that
the method comprises: stopping supply of the coal to the inner
cylinder; supplying the low-temperature heating gas and the
waste-heat gas tothe inner cylinder through control ofthe gas
flow rate adjustment means by the control means, and meanwhile
increasing an amount of fuel supplied to the heating gas
generation means; and stopping the supply of the
low-temperature heating gas and the waste-heat gastothe inner
cylinder through control of the gas flow rate adjustment means
by the control means when the gas temperature measured by the
gas temperature measurement means falls below a predetermined
temperature.
[0016]
A method for controlling upgraded coal production
equipment according to a sixth aspect of the invention for
solving the above problems is a method for controlling the
upgraded coal production equipment according to the fourth
aspect of the invention described above, characterized in that
themethodcomprises: intheequipmentmainbodytobe shutdown,
stopping supply ofthe coal tothe inner cylinder, andmeanwhile,
in the equipment main body in steady operation, increasing an
amount of the coal supplied to the drying means and increasing
an amount of the heating gas supplied to the outer cylinder;
in the equipment main body to be shut down, starting supply of
the low-temperature heating gas and the waste-heat gas to the
inner cylinder through control of the gas flow rate adjustment
means by the control means; in the equipment main body to be
shut down, stopping the supply of the heating gas to the inner
cylinderwhen all the coal is discharged fromtheinner cylinder,
and meanwhile, in the equipment main body in steady operation,
bringing the supply of the heating gas to the outer cylinder
to a steady state; and in the equipment main body to be shut
down, stopping the supply of the low-temperature heating gas
and the waste-heat gas to the inner cylinder through control
of the gas flow rate adjustment means by the control means when
all the pyrolysis gas is discharged from the inner cylinder.
EFFECT OF THE INVENTION
[0017]
According to the present invention, when the equipment
is to be shut down, the heating gas can be supplied to the
indirect-heating pyrolysis means until the coal (pyrolysis
coal) is discharged fromthe indirect-heating pyrolysis means,
so as to prevent tar from being newly generated by cooling of
the coal. By the supply of the low-temperature heating gas and
thewaste-heatgastotheindirect-heatingpyrolysismeans, the
indirect-heating pyrolysis means and the pyrolysis gas supply
means can be purged of the pyrolysis gas. Hence, tar can be
prevented frombeing attachedtothe inner wall surfaces ofthe
indirect-heating pyrolysis means and of the pyrolysis gas
supplymeans. Moreover, the oxygen concentration of each ofthe
low-temperature heating gas and the waste-heat gas is about 2
to 3 %. Thus, even if tar is attached to the inner wall surfaces
of the indirect-heating pyrolysis means and the pyrolysis gas
supply means, the tar can be combusted and removed. Hence, even
in shutting down the equipment, efficient tar removal can be
achievedwithout lowering the productionvolume ofthe upgraded
coal. since theindirect-heatingpyrolysismeans, thepyrolysis
gas supply means, and the like do not need tar removal work,
maintenance and inspection work can be performed efficiently.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018]
[Fig. 11 Fig. 1 is a schematic diagram showing the overall
configuration of upgraded coal production equipment according
to a first embodiment of the present invention.
[Fig. 21 Fig. 2is adiagramshowinga control flowperformed
bytheupgradedcoalproductionequipmentaccordingtothe first
embodiment of the present invention.
[Fig. 31 Fig. 3 is a schematic diagram showing the overall
configuration of upgraded coal production equipment according
to a second embodiment of the present invention.
[Fig. 41 Fig. 4 is adiagramshowinga control flowperformed
by the upgraded coal production equipment according to the
second embodiment of the present invention.
MODE FOR CARRYING OUT THE INVENTION
[0019]
Upgraded coal production equipment and a method for
controlling the upgraded coal production equipment according
to the present invention are described using embodiments.
EMBODIMENT 1
[0020]
Based on Figs. 1 and 2, a description is given of upgraded
coal production equipment according to a first embodiment of
the present invention.
[0021]
In upgraded coal production equipment 100 according to
this embodiment, first, as shown in Fig. 1, low-rank coal 1 such
as brown coal or subbituminous coal is supplied to a drying
devicelllbya hopper or the like (not shown), the dryingdevice
111 being dryingmeans for dryingthe low-rank coal 1. An outlet
of the drying device 111 communicates with an inlet 122a of a
pyrolysis device 121 configured to perform pyrolysis on dried
coal 2. An outlet 122b of the pyrolysis device 121 communicates
with an inlet of a cooling device 131 being cooling means for
cooling pyrolysis coal 3.
[0022]
The pyrolysis device 121 has an inner cylinder 122 and
an outer cylinder 123 surrounding the inner cylinder 122. The
outer cylinder 123 is supplied with a heating gas 11 to be
described later. Thereby, the dried coal 2 supplied into the
inner cylinder 122 is indirectly heated and is subjected to
pyrolysis, to generate the pyrolysis coal 3. In other words,
the pyrolysis device 121 is an indirect-heating device, such
as, e. g., an external heating kiln, in which a hot gas (heating
gas) being a heat source does not come into direct contact with
the low-rank coal 1. The pyrolysis device 121 forms
indirect-heating pyrolysis means.
[0023]
A gas exhaust port of the inner cylinder 122 of the
pyrolysis device 121 communicates with a gas intake port of a
combustion furnace 124 via a pyrolysis gas supply pipe 101.
Thereby, a pyrolysis gas 14 containing gaseous tar (pyrolysis
oil) generated by the pyrolysis is supplied to the gas intake
port of the combustion furnace 124. The gas intake port of the
combustion furnace 124 is also supplied with a fuel (not shown)
such as a natural gas. The combustion furnace 124 generates the
heating gas 11 by combusting the pyrolysis gas 14 and the fuel
such as a n a t u r a l gas. I n o t h e r words, t h e combustion furnace
1 2 4 forms heating gas generation means. A gas exhaust port of
the combustion furnace 124 communicates with a gas i n t a k e p o r t
of t h e o u t e r c y l i n d e r 123 of t h e p y r o l y s i s device 121 via a
heating gas f e e d p i p e 51.
[0024]
Theheatinggas feedpipe51communicateswithagasintake
port of a steam generator 125 v i a a heating gas branch pipe 53.
The steam g e n e r a t o r 125 forms waste-heat gas generation means
forgeneratingawaste-heat gas 13throughheatexchangebetween
the h e a t i n g gas 11 and water t o t h e r e b y g e n e r a t e water vapor.
Agas exhaust p o r t o f t h e steamgenerator 125 communicates with
an exhaust pipe 52 t o be described l a t e r via a waste-heat gas
feed pipe 5 4 .
[0025]
A gas exhaust p o r t of t h e o u t e r c y l i n d e r 123 of t h e
p y r o l y s i s device 121 communicates with a gas i n t a k e p o r t of an
exhaust-gas treatment device 127 v i a t h e exhaust pipe 52, t h e
exhaust-gas treatment device 127 being exhaust-gas
p u r i f i c a t i o n means f o r p u r i f y i n g t h e waste-heat gas 13 and a
low-temperature heating gas 12 which is generated when t h e
h e a t i n g g a s l l h e a t s t h e i n n e r c y l i n d e r 1 2 2 . the low-temperature
heating gas 12 and t h e waste-heat gas 13 a r e discharged t o t h e
outside of t h e system a f t e r undergoing t h e p u r i f i c a t i o n
treatment i n t h e exhaust-gas t r e a t m e n t device 127.
[0026]
The exhaust pipe 52 communicates with a gas i n t a k e p o r t
of a blower 126 via a mixed gas f e e d p i p e 55. A gas exhaust port
of t h e blower 126 communicates with a gas i n t a k e p o r t of t h e
combustion furnace124 via amixedgas supplypipe 56. Themixed
gas supply pipe 56 communicates with a mixed gas branch pipe
102. The mixed gas branch pipe 102 communicates with a mixed
gas communication pipe 104 via a flow rate adjustment valve
(three-way valve) 103, and also communicates with a mixed gas
distribution pipe 105 via the flow rate adjustment valve 103.
The mixed gas communication pipe 104 communicates with the
pyrolysis gas supply pipe 101. The mixed gas distribution pipe
105 communicates with a gas intake port of the inlet 122a side
of the inner cylinder 122 of the pyrolysis device 121.
[0027]
The pyrolysis gas supply pipe 101 is provided with a gas
temperaturemeasurementinstrument106whichis gas temperature
measurement means formeasuringthetemperature of a gas inside
the pipe. The gas temperature measurement instrument 106 is
connected to a control device 109 such that the measured gas
temperature canbe sent tothe control device 109. The pyrolysis
gas supply pipe 101 is provided with differential-pressure
measurement instruments 107a, 107b configured to measure the
differential pressure inside the pipe. The
differential-pressure measurement instruments 107a, 107b are
connected to the control device 109 such that the measured
differential pressure inside the pipe canbe sent tothe control
device 109.
[0028]
The o u t l e t 1 2 2 b o f t h e i n n e r c y l i n d e r 1 2 2 ofthepyrolysis
device 121 is provided with an inner-cylinder gas temperature
measurementinstrument108whichis gas temperaturemeasurement
means for measuring the temperature of a gas inside the inner
cylinder 122. The inner-cylinder gas temperature measurement
instrument 108 is connected to the control device 109 such that
the measured gas temperature inside the inner cylinder can be
sent to the control device 109.
[0029]
The exhaust pipe 52, the waste-heat gas feed pipe 54, the
mixed gas feed pipe 55, the blower 126, the mixed gas supply
pipe 56, the mixed gas branch pipe 102, the flow rate adjustment
valve 103, the mixed gas distribution pipe 105, and the like
form mixed gas distribution supply means. The flow rate
adjustment valve 103 forms gas flow rate adjustment means for
adjusting the amount of the low-temperature heating gas 12 and
the waste-heat gas 13 supplied to the pyrolysis device 121.
[0030]
Based on the measurement values obtained by the various
measurement instruments, the control device 109 controls the
flow rate adjustment valve 103, the amount of fuel supplied to
the combustion furnace 124, the amount of the low-rank coal 1
supplied to the drying device 111, the amount of the heating
gas 11 supplied to the pyrolysis device 121, and the like. In
other words, the control device 109 forms control means for
adjusting the valve position of the flow rate adjustment valve
103 and the like based on the measurement values obtained by
the various measurement instruments.
[0031]
In the upgraded coal production equipment 100 according
to this embodiment thus configured, when the low-rank coal 1
is charged into the hopper, the hopper supplies the low-rank
coal 1 at a room temperature to the drying device 111 a
predetermined amount at a time. The low-rank coal 1 supplied
to the drying device 111 is removed of water and becomes the
dried coal 2 by being heated up to about 200 OC by a drying
combustion gas (about 150 to 300 OC) from a drying combustor
(notshown).Thenfthedriedcoal2istransferredintotheinner
cylinder 122 of the pyrolysis device 121. The dried coal 2
transferred to the pyrolysis device 121 is subjected to
pyrolysis by being indirectly heatedby the heating gas 11 (gas
temperature: about 1050 "C, oxygen concentration: about 2 to
3 % ) from the combustion furnace 124. Thereby, the dried coal
2 becomes the pyrolysis coal 3 as a result of removal of
components such as the pyrolysis gas 14 containinggaseoustar,
and the pyrolysis coal 3 is fed to the cooling device 131. The
pyrolysis coal 3 fed tothe cooling device 131becomes upgraded
coal 4 by being cooled down to about 50 "C.
[0032]
Meanwhile, the heating gas 11 (gas temperature: about
1050 "C, oxygen concentration: about 2 to 3 %) generated in the
combustion furnace 124 is fed to the outer cylinder 123 of the
pyrolysis device 121 via the heating gas feed pipe 51. The
heating gas 11 used inside the outer cylinder 123 to heat the
inner cylinder 122 becomes the low-temperature heating gas 12
(gas temperature: about 350 "C, oxygen concentration: about 2
to 3 % ) . the low-temperatureheatinggas 12 is fedtothe exhaust
pipe 52. Meanwhile, the heating gas 11 is also fed to the steam
generator 125 via the heating gas feed pipe 51 and the heating
gasbranchpipe 5 3 . T h e h e a t i n g g a s 1 1 u s e d i n t h e s t e a m g e n e r a t o r
125 for generation of water vapor becomes the waste-heat gas
13 (gas temperature: about 350 "C, oxygen concentration: about
2 to 3 % ) . The waste-heat gas 13 is fed to the exhaust pipe 52
via the waste-heat gas feed pipe 54.
[0033]
Part of the low-temperature heating gas 12 and the
waste-heat gas 13 is supplied to the exhaust-gas treatment
device 127. The low-temperature heating gas 12 and the
waste-heat gas 13 undergo the purification treatment in the
exhaust-gas treatment device 127 and are then dischargedtothe
outside of the system. The rest of the low-temperature heating
gas 12 and the waste-heat gas 13 (gas temperature: about 350
OC, oxygen concentration: about 2 to 3 %) is fed to the blower
126 via the mixed gas feed pipe 55.
[0034]
Part of the low-temperature heating gas 12 and the
waste-heat gas 13 fed to the blower 126 is supplied to the
combustion furnace 124 via the mixed gas supply pipe 56. The
rest of the low-temperature heating gas 12 and the waste-heat
gas 13 (gas temperature: about 350 "C, oxygen concentration:
about 2 to 3 % ) fed to the blower 126 is supplied to the mixed
gas branch pipe 102. The rest of the low-temperature heating
gas 12 and the waste-heat gas 13 (gas temperature: about 350
OC, oxygen concentration: about 2 to 3 % ) supplied to the mixed
gas branch pipe 102 is suppliedtothe pyrolysis gas supply pipe
101 via the flow rate adjustment valve 103 and the mixed gas
communication pipe 104, or supplied to the inlet 122a side of
the inner cylinder 122 of the pyrolysis device 121 via the flow
rate adjustment valve 103 and the mixed gas distribution pipe
105.
[0035]
The valve position of the flow rate adjustment valve 103
is controlled by the control device 109 based on the gas
temperature measured by the gas temperature measurement
instrument 106. For example, the control device 109 adjusts the
flow rate adjustment valve 103 by opening it to increase the
aperture when the gas temperature measured by the gas
temperature measurement instrument 106 is equal to or higher
than 400 "C, and adjusts the flow rate adjustment valve 103 by
narrowing it when the gas temperature exceeds 550 "C. Thereby,
the low-temperature heating gas 12 and the waste-heat gas 13
(oxygen concentration: about 2 to 3 % ) are mixed with the
pyrolysis gas 14 (gas temperature: about 400 "C, oxygen
concentration: about 0 % ) , and this mixed gas has an oxygen
concentration adjusted to about 1 to 2 %. As a result, gaseous
tar (pyrolysis oil) is oxidatively decomposed (decoking) to
become light in weight, and thereby attachment of the tar to
the pyrolysis gas supply pipe 101 can be prevented. The tar is
reduced in weight to become a light gas, and this light gas is
combusted. Thus, decrease in the gas temperature is prevented.
Thereby, attachment of the tar to the pyrolysis gas supply pipe
101 can be prevented. Specifically, the decoking is performed
just when the tar is about to be attached to the inner wall
surface of the pyrolysis gas supply pipe 101 by adjustment of
the amount of the low-temperature heating gas 12 and the
waste-heat gas 13 supplied to the pyrolysis gas supply pipe 101
based on the gas temperature inside the pyrolysis gas supply
pipe 101. Hence, the tar can be efficiently removed.
[0036]
With reference to Fig. 2, a description is given of
operation performed when shutting down the upgraded coal
production equipment 100 according to this embodiment
configured as above.
As shown in Fig. 2, first, the upgraded coal production
equipment 100 is in steady operation (Step SA1) . To shut down
this upgraded coal production equipment 100, transfer of the
dried coal 2 to the inner cylinder 122 of the pyrolysis device
121 is stopped (Step SA2).
LO0371
Next, the flow proceeds to Step SA3 as well as to Step
SA11. In Step SA11, since the dried coal 2 is not newly
transferred to the inner cylinder 122 of the pyrolysis device
121, the amount of the pyrolysis gas 14 generated decreases.
The decrease in the generated amount of the pyrolysis gas 14
results in a decreased amount of the pyrolysis gas 14 supplied
tothe combustion furnace124. However, by increasing the amount
of fuel, such as a natural gas, supplied to the combustion
furnace 124 to increase the amount of additional gas to be
supplied to the combustion furnace 124, decrease in the gas
temperature and generated amount of the heating gas 11 can be
suppressed. In sum, the amount of additional gas to be supplied
tothe combustion furnace is increased (Step SA12). Thereafter,
all the pyrolysis coal3is discharged fromthepyrolysis device
121 (Step SA13). This means that the pyrolysis device 121
generates no more pyrolysis gas 14.
[0038]
Meanwhile, in Step SA3, the control device 109 adjusts
the flow rate adjustment valve 103 to start supply of the
low-temperature heating gas 12 and the waste-heat gas 13 to the
inlet122a sideofthe inner cylinder122 ofthepyrolysis device
121 via the mixed gas distribution pipe 105. In other words,
the low-temperature heating gas 12 and the waste-heat gas 13
are forcibly supplied into the inner cylinder 122 of the
pyrolysis device 121 from the inlet 122a side thereof. Thereby,
the inner cylinder 122 of the pyrolysis device 121 and the
pyrolysis gas supply pipe 101 are purged of the pyrolysis gas
14.
[0039]
Subsequently, since all the pyrolysis coal 3 is
discharged from the inside of the inner cylinder 122 of the
pyrolysis device 121, no pyrolysis gas 14 is generated by the
indirect heating of the dried coal 2. As a result, no pyrolysis
gas 14 is supplied to the combustion furnace 124. Thus, the
amount of additional gas to be supplied to the combustion
furnace 124 is decreased (Step SA4). This consequently
decreases the gas temperature and generated amount of the
heating gas 11 generated in the combustion furnace 124 (Step
SA5) .
[0040]
Next, since the heating gas 11 which is less in amount
and lower in temperature than in the steady operation is
supplied to the outer cylinder 123 of the pyrolysis device 121,
thetemperatureofthepyrolysisdevice121decreases (StepSA6).
This consequently decreases the temperature of the
low-temperature heating gas 12 itself and also the temperature
of the waste-heat gas 13 (Step SA7).
[0041]
Then, the flow proceeds to Step SA8 in which the control
device 109makes a judgment basedon the gas temperature inside
the inner cylinder measured by the inner-cylinder gas
temperature measurement instrument 108. When the gas
temperature near the outlet 122b of the inner cylinder 122 of
the pyrolysis device 121 is higher than 300 "C, the flow returns
to Step SA4. On the other hand, when the gas temperature near
the outlet122b ofthe inner cylinder122 ofthe pyrolysis device
121 is equal to or lower than 300 "C, the flow proceeds to Step
SA9 in which the control device 109 controls the flow rate
adjustment valve 103 to close the flow rate adjustment valve
103. In other words, supply of the low-temperature heating gas
12 and the waste-heat gas 13 to the inner cylinder 122 of the
pyrolysis device 121 is stopped.
[0042]
Hence, in the upgraded coal production equipment 100
according to this embodiment, in shutting down the equipment,
the low-temperature heating gas 12 and the waste-heat gas 13
are supplied to the inlet 122a side of the inner cylinder 122
ofthe pyrolysis device 121to forciblydischargethepyrolysis
gas 14 inside the inner cylinder 122 of the pyrolysis device
1 2 1 a n d i n s i d e t h e p y r o l y s i s gas supplypipe101. Moreover, this
pyrolysis gas 14 is combusted in the combustion furnace 124.
[0043]
Further, since the oxygen concentration of the
low-temperature heating gas 12 and the waste-heat gas 13 is
about 2 to 3 %, tar can be oxidativelydecomposedtobecomelight
in weight. The gas thus reduced in weight flows the combustion
furnace 124 and combusted inside the combustion furnace 124.
Even if tar is attached to the inner wall surface of the inner
cylinder 122 of the pyrolysis device 121 or the inner wall
surface of the pyrolysis gas supply pipe 101, the tar can be
removed by combustion.
[0044]
Thus, even in shutting down the equipment, tar can be
efficiently removed without lowering the production volume of
the upgraded coal 4. In addition, since tar can be prevented
from being attached to the inner wall surfaces of the inner
cylinder 122 of the pyrolysis device 121 and the pyrolysis gas
supply pipe 101, maintenance and inspection work can be
efficiently performed.
EMBODIMENT 2
[0045]
Based on Figs. 3, 4A, and 4B, upgraded coal production
equipment according to a second embodiment of the present
invention is described.
[0046]
As showninFig. 3, theupgradedcoalproductionequipment
according to this embodiment includes three upgraded coal
production equipmentmain bodies 100A, 100B, and 100C arranged
in parallel. Like the upgraded coal production equipment 100
accordingtothe firstembodimentdescribedabove, the upgraded
coal production equipment main bodies 100A, 100B, and 100C each
include a drying device 111, a pyrolysis device 121, and a
cooling device 131.
[0047]
L i k e t h e u p g r a d e d c o a l p r o d u c t i o n e q u i p m e n t 1 0 0 according
to the first embodiment described above, the upgraded coal
production equipment according tothis embodiment includes one
combustion furnace 124, one blower 126, and one exhaust-gas
treatment device 127. A gas exhaust port of the blower 126
communicates with a gas intake port of the combustion furnace
124 via a mixed gas supply pipe 56. A gas exhaust port of the
combustion furnace 124 communicates with an outer cylinder 123
of a pyrolysis device 121 of each of the equipment main bodies
100A, 100B, and lOOC via a corresponding one of heating gas feed
pipes 51a to 51c.
[0048]
The heating gas feed pipes 51a to 51c communicate with
gas intake ports of steam generators 125 via heating gas branch
pipes 53a to 53c, respectively. Gas exhaust ports of the steam
generators 125 communicate with waste-heat gas feed pipes 54a
to 54c, respectively.
[0049]
Gas exhaust ports of the outer cylinders 123 of the
pyrolysis devices 121cornmunicatewithexhaustpipes 52ato 52c,
respectively. Part of awaste-heat gas 13 andalow-temperature
heating gas 12 which is generated when a heating gas 11 heats
inner cylinders 122 is supplied via waste-heat gas feed pipe
54a to 54c or the exhaust pipes 52a to 52c to the exhaust-gas
treatment device 127 being exhaust gas purification means for
performing purification treatment on the low-temperature
heating gas 12 and the waste-heat gas 13, and is discharged to
the outside of the system after undergoing the purification
treatment in the exhaust-gas treatment device 127. The rest of
the low-temperature heating gas 12 and the waste-heat gas 13
is supplied to the blower 126 via the exhaust pipes 52a to 52c
or the waste-heat gas feed pipes 54a to 54c and the mixed gas
feed pipe 55.
[0050]
Gas exhaust ports of the inner cylinders 122 of the
pyrolysis devices 121 communicate with gas intake ports of the
combustion furnace 124 via pyrolysis gas supply pipes 101a to
101c, respectively.
[0051]
The mixed gas supply pipe 56 communicates with mixed gas
branch pipes 102a to 102c. The mixed gas branch pipes 102a to
102ccommunicatewithmixedgas communicationpipes104ato104c
via flow rateadjustment valves (three-wayvalves) 103ato103cf
respectively, and also communicate with mixed gas distribution
pipes 105a to 105c via the flow rate adjustment valves 103a to
103c, respectively. The mixed gas communication pipes 104a to
104c communicate with the pyrolysis gas supply pipes lOla to
101cr respectively. The mixed gas distribution pipes 105a to
105c communicate with gas intake ports of the inlet 122a side
of the inner cylinders 122 of the pyrolysis devices 121,
respectively.
[00521
The pyrolysis gas supply pipe l0la is provided with a gas
temperature measurement instrument 106 being gas temperature
measurement means for measuring the gas temperature inside the
pipe. The gas temperature measurement instrument 106 is
connected to the control device 109 such that the measured gas
temperature can be sent to the control device 109. Like the
pyrolysis gas supply pipe lola, the pyrolysis gas supply pipes
lOlb and l0lc are each provided with a gas temperature
measurement instrument (not shown), as well. These gas
temperature measurement instruments are also connected to the
control device 109 such that the gas temperature measured by
the gas temperature measurement instruments can be sent to the
control device 109.
[0053]
The pyrolysis gas supply pipe lOla is provided with the
differential-pressure measurement instruments 107ar 107b
configured to measure the differential pressure in the pipe.
The differential-pressure measurement instruments 107ar 107b
are connected to the control device 109 such that the measured
differential pressure in the pipe can be sent to the control
device 109. Like the pyrolysis gas supply pipe lola, the
pyrolysis gas supply pipes lOlb and lOlc are each provided with
differential-pressure measurement instruments (not shown), as
well. These differential-pressure measurement instruments are
also connected to the control device 109 such that the
differential pressure in the pipe measured by the
differential-pressure measurement instruments can be sent to
the control device 109.
[0054]
The o u t l e t 1 2 2 b o f t h e i n n e r c y l i n d e r 1 2 2 ofthe pyrolysis
device 121 of the equipment main body lOOA is provided with an
inner-cylinder gas temperature measurement instrument 108
configured to measure the temperature of the gas inside the
inner cylinder 122. The inner-cylinder gas temperature
measurement instrument 108 is connected to the control device
109 such that the measured temperature of the gas inside the
inner cylinder can be sent to the control device 109. Like the
equipment main body 100A, the outlet 122b of the inner cylinder
122 of the pyrolysis device 121 of each of the equipment main
bodies lOOB and lOOC is also provided with an inner-cylinder
gas temperature measurement instrument (not shown) configured
to measure the temperature of the gas inside the inner cylinder
122. These inner-cylinder gas temperature measurement
instruments are also connected to the control device 109 such
that the measured temperature of gas inside the inner cylinder
can be sent to the control device 109.
[0055]
Theexhaustpipes 52ato52c,thewaste-heat gas feedpipes
54a to 54c, the mixed gas feed pipe 55, the blower 126, the mixed
gas supply pipe 56, the mixed gas branch pipes 102a to 102c,
the flow rate adjustment valves 103a to 103c, the mixed gas
distribution pipes 105a to 105c, and the like form mixed gas
distributionsupplymeans. The flow rate adjustment valves 103a
to 103c form gas flow rate adjustment means for adjusting the
amount of the low-temperature heating gas 12 and the waste-heat
gas 13 supplied to the pyrolysis devices 121 of the equipment
main bodies 100A, 100B, and 100C, respectively.
[0056]
Based on the measurement values of the various
measurement instruments, the control device 109 controls the
flow rate adjustment valves 103a to 103c, the amount of fuel
supplied to the combustion furnace 124, the amount of the
low-rank coal 1 supplied to the drying device 111 of each of
the equipment main bodies 100A, 100B, and 100C, the amount of
the heating gas 11 supplied to the pyrolysis device 121 of each
ofthe equipmentmainbodies 100A, 100B, andlOOC, and the like.
In other words, the control device 109 forms control means for
adjustingthevalvepositions ofthe flow rate adjustment valves
103a to 103c and the like based on the measurement values
obtained by the various measurement instruments.
[0057]
In the upgraded coal production equipment according to
this embodiment thus configured, the operation for performing
control toprevent attachment of tar tothe pyrolysis gas supply
pipes lola, 101b, and lOlc during the steady operation is the
sameasthatperformedbytheupgradedcoalproductionequipment
100 according to the first embodiment described above, and is
therefore not described again here.
[0058]
With reference to Figs. 4A and 4B, operation performed
when a upgraded coal production equipment main body of the
upgradedcoalproductionequipmentaccordingtothisembodiment
is shut down and then r e t u r n s t o a s t e a d y o p e r a t i o n s t a t e .
In a c a s e d e s c r i b e d , w h i l e t h e upgraded c o a l p r o d u c t i o n
equipment main bodies lOOB and 100C a r e i n a s t e a d y o p e r a t i o n
s t a t e , t h e upgraded c o a l p r o d u c t i o n equipment main body lOOA
is shut down and then r e t u r n s t o t h e s t e a d y o p e r a t i o n s t a t e .
[0059]
As shown i n Figs. 4A and 4B, f i r s t , t h e upgraded c o a l
p r o d u c t i o n e q u i p m e n t m a i n b o d y 1 0 0 A i s i n s t e a d y o p e r a t i o n (Step
SB1) . The upgraded coal p r o d u c t i o n equipment main bodies lOOB
and lOOC a r e a l s o i n s t e a d y o p e r a t i o n (Step SC1).
[0060]
To shut down t h e upgraded c o a l p r o d u c t i o n equipment main
body 100A, t r a n s f e r of t h e d r i e d c o a l 2 t o t h e i n n e r c y l i n d e r
122 of t h e p y r o l y s i s device 121 is stopped ( S t e p SB2). Since
t h i s d e c r e a s e s t h e amount of t h e d r i e d c o a l 2 i n s i d e t h e i n n e r
c y l i n d e r 122 of t h e p y r o l y s i s d e v i c e 121 o f t h e equipment main
body 100A, t h e amount of t h e h e a t i n g gas 11 s u p p l i e d from t h e
combustion furnace 124 t o t h e o u t e r c y l i n d e r 123 of t h e
p y r o l y s i s d e v i c e 1 2 1 i s d e c r e a s e d ( S t e p S B 3 ) . Thus, thermal load
in t h e p y r o l y s i s device 121 of t h e equipment main body lOOA
d e c r e a s e s . Meanwhile, intheequipmentmainbodies lOOBandlOOC,
the amount o f t h e d r i e d c o a l 2 t r a n s f e r r e d t o t h e i n n e r c y l i n d e r
122 of t h e p y r o l y s i s device 121 of e a c h o f t h e equipment main
bodies lOOB and lOOC is i n c r e a s e d ( S t e p SC2). Since t h i s
i n c r e a s e s t h e amount of t h e d r i e d c o a l 2 i n s i d e t h e i n n e r
c y l i n d e r 1 2 2 o f t h e p y r o l y s i s d e v i c e 1 2 1 0 f e a c h o f t h e e q u i p m e n t
main bodies lOOB and 100C, t h e amount of t h e h e a t i n g gas 11
supplied from t h e combustion furnace 124 t o t h e o u t e r c y l i n d e r
123 of each p y r o l y s i s device 121 is i n c r e a s e d (Step SC3). Thus,
thermal l o a d i n t h e p y r o l y s i s d e v i c e 1 2 1 o f e a c h o f t h e e q u i p m e n t
main b o d i e s lOOB and lOOC i n c r e a s e s .
[0061]
Subsequently, t h e c o n t r o l d e v i c e 109 a d j u s t s t h e flow
r a t e adjustment valve 103a t o supply t h e low-temperature
h e a t i n g gas 12 and t h e waste-heat g a s 1 3 t o t h e i n l e t 122a s i d e
of t h e i n n e r c y l i n d e r 122 of t h e p y r o l y s i s d e v i c e 121 v i a t h e
mixed gas d i s t r i b u t i o n pipe 105a ( S t e p SB4). By t h e
low-temperature h e a t i n g g a s 12 and t h e waste-heat gas 13, t h e
inner c y l i n d e r 122 o f t h e p y r o l y s i s d e v i c e 1 2 1 a n d t h e p y r o l y s i s
gas supply pipe lOla of t h e equipment main body 100A a r e purged
of t h e p y r o l y s i s gas 1 4 . Moreover, t h e oxygen c o n c e n t r a t i o n of
the gas i n s i d e t h e i n n e r c y l i n d e r 122 and t h e p y r o l y s i s gas
supply p i p e 101a becomes about 1 t o 2 %, so t h a t t h e t a r is
o x i d a t i v e l y decomposedto be r e d u c e d i n weight. Then, t h e l i g h t
gas o b t a i n e d by t h e weight r e d u c t i o n is combusted. Hence,
attachment of t h e t a r t o t h e wall s u r f a c e of t h e i n n e r c y l i n d e r
122 and t h e w a l l s u r f a c e of t h e p y r o l y s i s gas supply pipe lOla
is prevented.
[0062]
Subsequently, a l l t h e p y r o l y s i s c o a l 3 is d i s c h a r g e d from
the i n n e r c y l i n d e r 122 of t h e p y r o l y s i s d e v i c e 121 of t h e
equipment main body 100A (Step SB5), and t h e supply of t h e
heating gas 11 t o t h e o u t e r c y l i n d e r 1 2 3 o f t h e p y r o l y s i s device
121 of t h e equipment main body lOOA i s stopped (Step SB6).
Consequently, thermal load i n t h e p y r o l y s i s d e v i c e 121 of t h e
equipmentmainbodylOOAdecreases. Meanwhile, i n t h e equipment
main bodies lOOB and 100C, t h e supply of t h e h e a t i n g gas 11 t o
the o u t e r c y l i n d e r 123 of t h e p y r o l y s i s d e v i c e 121 of each of
the equipmentmainbodies lOOB and 100 C i s b r o u g h t t o t h e steady
state (Step SC4). Thereby, the pyrolysis device 121 of each of
the equipment main bodies lOOB and lOOC maintains the state of
the increased thermal load.
[0063]
Next, in the equipment main body 100A, when a
predetermined period of time elapses after the stop of the
supply of the heating gas 11 to the outer cylinder 123 of the
pyrolysis device121ofthe equipmentmainbody100A (Step SB7),
the pyrolysis gas 14 is no longer in the inner cylinder 122 of
the pyrolysis device 121andthe pyrolysis gas supply pipe lOla
of the equipment main body 100A, and therefore no more supply
of the low-temperature heating gas 12 and the waste-heat gas
13isnecessary. Thus, thesupplyofthe low-temperatureheating
gas 12 and the waste-heat gas 13 to the inlet 122a side of the
inner cylinder 122 of the pyrolysis device 121 of the equipment
main body 100A is stopped (Step SB8). In this Step SB8, work
suchasmaintenanceandinspectionisperformedontheequipment
main body lOOA when necessary.
[0064]
Next, once the work such as maintenance and inspection
is finished, to bring the equipment main body lOOA back to the
steady operation state, first, in the equipmentmainbodylOOA,
transfer of the dried coal 2 from the drying device 111 into
the inner cylinder 122 of the pyrolysis device 121 is started
(Step SB9). Thereby, the amount of the dried coal 2 inside the
inner cylinder 122 of the pyrolysis device 121 of the equipment
main body 100A increases. Thus, the amount of the heating gas
11 supplied from the combustion furnace 124 to the outer
cylinder 123 of the pyrolysis device 121 is increased (Step
SB10) . Thereby, thermal load in the pyrolysis device 121 of the
equipmentmainbodylOOAincreases. Meanwhile, in the equipment
main bodies lOOB and 100C, the amount of the dried coal 2
transferred to the inner cylinder 122 of the pyrolysis device
121 of each of the equipment main bodies lOOB and lOOC is
decreased (Step SC5). Since this decreases the amount of the
dried coal 2 inside the inner cylinder 122 of the pyrolysis
device 121 of each of the equipment main bodies 100B and 100C,
the amount of the heating gas 11 supplied from the combustion
furnace 124 to the outer cylinder 123 of each pyrolysis device
121 is decreased (Step SC6). Consequently, thermal load in the
pyrolysis device 121 of each of the equipment main bodies lOOB
and lOOC decreases.
[0065]
Thereafter, when the amount of the dried coal 2 supplied
to the inner cylinder 122 of the pyrolysis device 121 of the
equipmentmainbodylOOAreaches apredeterminedamountandalso
when the amount of the heating gas 11 supplied to the outer
cylinder123 ofthepyrolysisdevice 121reaches apredetermined
amount, the equipment main body lOOA is back in the steady
operation state (Step SB11) . Meanwhile, when the amount of the
dried coal2 s u p p l i e d t o t h e i n n e r c y l i n d e r 1 2 2 ofthe pyrolysis
device 121 of each of the equipment main bodies 100B and lOOC
reaches a predetermined amount and also when the amount of the
heating gas 11 supplied to the outer cylinder 123 of each
pyrolysis device 121 reaches a predetermined amount, the
equipment main bodies lOOB and 100C are also back in the steady
operation state (Step SC7).
[0066]
In a case of shutting down the equipment main body 100B
or the equipment main body 100C, operation according to the
procedures as described for the equipment main body 100A above
can also prevent attachment of tar to the inner wall surfaces
of the inner cylinder 122 of the pyrolysis device 121 and the
pyrolysis gas supply pipe lOlb or lOlc of the equipment main
body lOOB or 100C. In other words, by performing the
above-described operation sequentially on equipment main
bodies to be shut down, tar can be efficiently removed in each
equipmentmainbodytobe shutdown, while suppressinglowering
of the operating rate of the entire upgraded coal production
equipment.
[0067]
Hence, in the upgraded coal production equipment of this
embodiment, like the upgraded coal production equipment 100
according tothe first embodiment described above, to shut down
an equipment main body, the low-temperature heating gas 12 and
the waste-heat gas 13 are supplied to the inlet 122a side of
the inner cylinder 122 of the pyrolysis device 121 of the
equipment main body to be shut down, in order to forcibly
discharge the pyrolysis gas 14 inside the inner cylinder 122
of the pyrolysis device 121 and inside the pyrolysis gas supply
pipe. This pyrolysis gas 14 is combusted in the combustion
furnace 124.
[0068]
Further, since the oxygen concentration of the
low-temperature heating gas 12 and the waste-heat gas 13 is
about2to 3 %, tar canbe oxidativelydecomposedtobecomelight
in weight. The gas thus reduced in weight flows the combustion
furnace 124 and is combusted inside the combustion furnace 124.
Even if tar is attached to the inner wall surface of the inner
cylinder 122 of the pyrolysis device 121 or the inner wall
surface ofthe pyrolysis gas supply pipe, the tar canbe removed
by the combustion.
[0069]
Thus, even in shutting down an equipment main body, tar
can be efficiently removed without lowering the production
volume of the upgraded coal 4. In addition, since tar can be
prevented frombeing attachedtothe inner wall surfaces ofthe
inner cylinder122 ofthe pyrolysis d e v i c e 1 2 1 a n d t h e p y r o l y s i s
gas supply pipe, maintenance and inspection work can be
efficiently performed.
[0070]
OTHER EMBODIMENTS
Although the upgraded coal production equipment
described above has three upgraded coal production equipment
main bodies 100A, 100B, and lOOC arranged in parallel, the
number of the upgraded coal production equipment main bodies
is not limited to three, but the upgraded coal production
equipment may have two or four or more upgraded coal production
equipment main bodies arranged in parallel.
[0071]
The upgraded coal production equipment described above
is configuredto stop supply ofthe low-temperature heating gas
12 and the waste-heat gas 13 to the inner cylinder 122 of the
pyrolysis device 121 of the equipment main body 100A based on
a period of time elapsed after the stop of the supply of the
heating gas lltothe outer cylinder123 ofthe pyrolysis device
121 of the equipment main body 10OA. The upgraded coal
production equipment can also stop the supply of the
low-temperature heating gas tothe inner
cylinder of the pyrolysis device of the equipment main body to
be shut down, based on measurement values obtained by
measurement instruments, such as the differential-pressure
measurement instruments 107a, 107b, of the equipment main body
to be shut down.
INDUSTRIAL APPLICABILITY
[0072]
The upgraded coal production equipmentandthemethod for
controlling the same according to the present invention can
remove tar efficiently without lowering the production volume
of upgraded coal even in shutting down the equipment, and can
therefore be utilized significantly beneficially in various
industries.
EXPLANATION OF REFERENCE NUMERALS
[0073]
1 low-rank coal
2 dried coal
3 pyrolysis coal
4 upgraded coal
11 heating gas
12 low-temperature heating gas
13 waste-heat gas
14 pyrolysis gas
51, 51a to 51c heating gas feed pipe
52, 52a to 52c exhaust pipe
53, 53a to 53c heating gas branch pipe
54, 54a to 54c waste-heat gas feed pipe
55 mixed gas feed pipe
56 mixed gas supply pipe
100 upgraded coal production equipment
100A, 100B, lOOC upgraded coal production
equipment main body
101, lOla to lOlc pyrolysis gas supply pipe
102, 102a to 102c mixed gas branch pipe
103, 103a to 103c flow rate adjustment valve
(three-way valve)
104, 104a to 104c mixed gas communication pipe
105, 105a to 105c mixed gas distribution pipe
106 gas temperature measurement instrument
107a, 107b differential pressure measurement
instrument
108 inner-cylinder gas temperature measurement
instrument
109 control device
111 drying device
121 pyrolysis device
122 inner cylinder
123 outer cylinder
124 combustion furnace
125 steam generator
12 6 blower
127 exhaust gas treatment device
131 cooling device
CLAIMS
[Claim 11
Upgraded coal production equipment including
drying means for drying coal,
pyrolysis means for performing pyrolysis on the
dried coal, and
coolingmeans for cooling the coal subjectedtothe
pyrolysis,
the pyrolysis means being an indirect-heating pyrolysis
device having an inner cylinder into which the dried coal is
transferred and an outer cylinder which is supplied with a
heating gas for heating the inner cylinder,
characterized in that the equipment comprises:
heating gas generation means for generating the
heating gas;
pyrolysis gas supply means for supplying the
heating gas generation means with a pyrolysis gas generated in
the inner cylinder;
waste-heat gas generation means for receiving
supply of part of the heating gas generated in the heating gas
generation means and generating a waste-heat gas by subjecting
the heating gas to heat exchange; and
mixed gas distribution supply means for
distributing and supplying, to the inner cylinder, the
waste-heat gas anda low-temperatureheatinggas generatedwhen
the heating gas heats the coal indirectly inside the outer
cylinder.
[Claim 21
Theupgradedcoalproductionequipmentaccordingto claim
1, characterized in that
the mixed gas distribution supply means is connected to
the inner cylinder at an inlet side of the inner cylinder which
receives the dried coal.
[Claim 31
~ h e u p g r a d e d c o a l p r o d u c t i o n e q u i p m e n t a c c o r d i n g t o c l a i m
2, characterized in that
the indirect-heating pyrolysis device includes gas
temperature measurement means for measuring a gas temperature,
the gas temperature measurement means being provided at an
outlet side from which the dried coal is discharged, and
the mixed gas distribution supply means includes
gas flow rate adjustment means for adjusting a flow
rate of the low-temperature heating gas and the waste-heat gas
supplied to the inner cylinder, and
control means for controlling the gas flow rate
adjustment means based on the gas temperature measured by the
gas temperature measurement means.
[Claim 41
Theupgradedcoalproductionequipmentaccordingto claim
3, characterized in that
the equipment comprises a plurality of equipment main
bodies being arranged in parallel and each having the drying
means, the indirect-heating pyrolysis device, and the cooling
means.
[Claim 51
A method for controlling the upgraded coal production
equipmentaccordingtoclaim3, characterizedinthat themethod
comprises:
stopping supply of the coal to the inner cylinder;
supplying the low-temperature heating gas and the
waste-heat gas tothe inner cylinder through control ofthe gas
flow rate adjustment means by the control means, and meanwhile
increasing an amount of fuel supplied to the heating gas
generation means; and
stopping the supply of the low-temperature heating gas
and the waste-heat gas to the inner cylinder through control
of the gas flow rate adjustment means by the control means when
the gas temperaturemeasuredby the gas temperaturemeasurement
means falls below a predetermined temperature.
[Claim 61
A method for controlling the upgraded coal production
equipment according to claim 4, the method comprising:
in the equipment main body to be shut down, stopping supply
of the coal to the inner cylinder, and meanwhile, in the
equipment main body in steady operation, increasing an amount
ofthecoalsuppliedtothedryingmeans andincreasinganamount
of the heating gas supplied to the outer cylinder;
inthe equipmentmainbodytobeshutdown, startingsupply
of the low-temperature heating gas and the waste-heat gas to
the inner cylinder through control of the gas flow rate
adjustment means by the control means;
in the equipment main body to be shut down, stopping the
supply of the heating gas to the inner cylinder when all the
coal is discharged from the inner cylinder, and meanwhile, in
theequipmentmainbodyinsteadyoperation, bringingthe supply
of the heating gas to the outer cylinder to a steady state; and
in the equipment main body to be shut down, stopping the
supply of the low-temperature heating gas and the waste-heat
gas to the inner cylinder through control of the gas flow rate
adjustment means by the control means when all the pyrolysis
gas is discharged from the inner cylinder.