TECHNICAL FIELD
The present invention relates to a coal pyrolysis device.
BACKGROUND ART
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 in a low-oxygen
atmosphere so that the surface activity is reduced, whereby the low grade coal is
turned into modified coal having a high calorific content per unit weight while
10 preventing spontaneous combustion.
Here, direct heating type devices that directly heat dried coal with a heating
gas (see Patent Documents 1, 2) and indirect heating type devices that indirectly
heat dried coal with a heating gas are known as coal pyrolysis devices for
pyrolysis of dried coal obtained by drying low grade coal as described above. The
15 indirect heating type of device includes, for example, the rotary kiln type device
that includes a fixed supported outer cylinder Uacket), and a rotatably supported
inner cylinder on the inside of the outer cylinder. In such a coal pyrolysis device,
heating gas is supplied within the outer cylinder (between the outer cylinder and
the inner cylinder), and the dried coal is supplied to a first end side of the inner
20 cylinder. By rotating the inner cylinder, the dried coal is heated and pyrolyzed
while being agitated and moving from the first end side of the inner cylinder to a
second end side. The pyrolyzed coal and the pyrolyzed gas are output from the
second end side of the inner cylinder.
25 CITATION LISTS
Patent Literature
Patent Document 1: Japanese Unexamined Patent Application Publication
No. S61-64788A
Patent Document 2: Japanese Unexamined Patent Application Publication
30 No. 2012-241992A
SUMMARY OF THE INVENTION
Technical Problem
The pyrolyzed gas includes not only water vapor, carbon dioxide, low
35 molecular weight hydrocarbons (for example, methane, ethane, and the like), tar,
and the like, but also a minute quantity of sulfur included in the dried coal. In
2
order to promote the release of this minute component in the pyrolysis process, it
is necessary to increase the difference in partial pressure between the pyrolyzed
gas component in the atmosphere gas within the inner cylinder and the pyrolyzed
gas component at the surface of the dried coal. For example, supplying low-
5 oxygen concentration inert gas from the exterior into the inner cylinder to reduce
the concentration of pyrolyzed gas in the atmosphere within the inner cylinder can
be considered.
Normally nitrogen gas is used as the inert gas, but in order to produce
nitrogen gas by separating the nitrogen gas from air, a pressure swing adsorption
10 (PSA) or cryogenic separation device is necessary. The quantity of nitrogen gas
consumed by the coal pyrolysis device increases in accordance with the size of the
coal pyrolysis device (the quantity of dried coal processed by the coal pyrolysis
device), so the capacity of the PSA or cryogenic separation device increases,
which increases the plant cost and the electrical power cost for producing the
15 nitrogen gas.
20
In light of the above, in order to solve the above problems, an object of the
present invention is to provide a coal pyrolysis device capable of obtaining at low
cost an inert gas (low-oxygen concentration gas) for promoting release of the
pyrolyzed gas from the coal.
Solution to Problem
The coal pyrolysis device according to a first invention for solving the
above problems includes: a rotary kiln type coal pyrolysis device main body that
rotatably supports an inner cylinder inside an outer cylinder, the rotary kiln type
25 coal pyrolysis device main body being configured to supply coal into the inner
cylinder from a first end side of the inner cylinder as well as supplying heating gas
into the outer cylinder and rotate the inner cylinder to heat and pyrolyze the coal
while moving the coal from the first end side of the inner cylinder to a second end
side and agitating the coal, and to output the pyrolyzed coal and pyrolyzed gas
30 from the second end side of the inner cylinder; exhaust means provided connected
to the outer cylinder, the exhaust means being for exhausting the heating gas
within the outer cylinder; gas extraction means for extracting a portion of the
heating gas exhausted by the exhaust gas means; and low-oxygen concentration
gas supply means for supplying the heating gas extracted by the gas extraction
35 means into the inner cylinder so that the concentration of oxygen contained in the
heating gas is reduced.
3
The coal pyrolysis device according to a second invention for solving the
above problems is the coal pyrolysis device according to the first invention as
described above. In such a coal pyrolysis device, the low-oxygen concentration
gas supply means include deoxygenation means for removing the oxygen
5 contained in the heating gas, and low-oxygen concentration gas delivery means for
delivering the low-oxygen concentration gas obtained from the deoxygenation
means into the inner cylinder.
The coal pyrolysis device according to a third invention for solving the
above problems is the coal pyrolysis device according to the second invention as
10 described above. In such a coal pyrolysis device, the deoxygenation means include
fuel addition means for adding fuel to the heating gas, and a combustion catalyst
provided so as to come into contact with the heating gas to which the fuel has been
added.
The coal pyrolysis device according to a fourth invention for solving the
15 above problems is the coal pyrolysis device according to the third invention as
described above. Such a coal pyrolysis device further includes heating means
provided in the gas extraction means, the heating means being for heating the
heating gas.
The coal pyrolysis device according to a fifth invention for solving the
20 above problems is the coal pyrolysis device according to the third invention as
described above. Such a coal pyrolysis device further includes desulfurization
means provided in the exhaust means, the desulfurization means being for
removing sulfur oxide contained in the heating gas.
The coal pyrolysis device according to a sixth invention for solving the
25 above problems is the coal pyrolysis device according to the fourth invention as
described above. Such a coal pyrolysis device further includes: oxygen
concentration measuring means for measuring an oxygen concentration of the lowoxygen
concentration gas delivered by the low-oxygen concentration gas delivery
means; and fuel addition quantity control means for controlling a quantity of the
30 fuel added by the fuel addition means on the basis of information obtained by the
oxygen concentration measuring means so that the oxygen concentration of the
low-oxygen concentration gas is 1.5% or less.
The coal pyrolysis device according to a seventh invention for solving the
above problems is the coal pyrolysis device according to the second invention as
35 described above. In such a coal pyrolysis device, the deoxygenation means include
an alternating combustion device that includes a combustion chamber to which the
heating gas is delivered, a burner provided within the combustion chamber, and an
4
alternating type heat exchanger provided within the combustion chamber in a
location to which the heating gas is delivered, and fuel addition means for adding
fuel to the combustion chamber.
The coal pyrolysis device according to an eighth invention for solving the
5 above problems is the coal pyrolysis device according to the seventh invention as
described above. Such coal pyrolysis device further includes: oxygen
concentration measuring means for measuring the concentration of oxygen
contained in the heating gas delivered by the low-oxygen concentration gas
delivery means; and fuel addition quantity control means for controlling a quantity
10 of the fuel added by the fuel addition means on the basis of information obtained
by the oxygen concentration measuring means so that the oxygen concentration of
the low-oxygen concentration gas is 1.5% or less.
The coal pyrolysis device according to a ninth invention for solving the
above problems is the coal pyrolysis device according to the first invention as
15 described above. In such a coal pyrolysis device, the low-oxygen concentration
gas supply means include heating gas delivery means for delivering the heating
gas extracted by the gas extraction means into the inner cylinder, and fuel addition
means for adding fuel to the heating gas delivered into the inner cy Iinder by the
heating gas delivery means.
20 The coal pyrolysis device according to a tenth invention for solving the
above problems is the coal pyrolysis device according to the ninth invention as
described above. Such a coal pyrolysis device further includes: heating gas flow
rate measuring means for measuring a flow rate of the heating gas delivered by the
heating gas delivery means; oxygen concentration measuring means for measuring
25 a concentration of oxygen contained in the heating gas delivered by the heating
gas delivery means; and fuel addition quantity control means for controlling a
quantity of the fuel added by the fuel addition means on the basis of information
obtained by the heating gas flow rate measuring means and the oxygen
concentration measuring means so that the oxygen concentration of the low-
30 oxygen concentration gas is 1.5% or less.
Advantageous Effect of Invention
According to the coal pyrolysis device of the present invention, it is
possible to obtain the inert gas by reducing the concentration of oxygen contained
35 in the heating gas that has indirectly heated the coal, using the low-oxygen
concentration gas supply means. The cost of the low-oxygen concentration gas
supply means itself and the operating cost thereof are lower than those of a PSA or
5
cryogemc separation device, so the inert gas that promotes release of the
pyrolyzed gas from the coal can be obtained at low cost. In the case that
generating the inert gas raises the temperature of the inert gas itself, the coal
within the coal pyrolysis device main body can be heated by the inert gas, which
5 allows the size of the coal pyrolysis device main body to be reduced.
Brief Description of Drawings
FIG. 1 is a schematic view of the configuration of a first embodiment of the
coal pyrolysis device according to the present invention;
10 FIGS. 2A and 2B are schematic views of the configuration of a second
embodiment of the coal pyrolysis device according to the present invention, FIG.
2A is an overall view, and FIG. 2B is a schematic view illustrating an alternating
combustion deoxygenation device provided in the coal pyrolysis device; and
FIG. 3 is a schematic view of the configuration of a third embodiment of the
15 coal pyrolysis device according to the present invention.
Description of Embodiments
The following is a description of embodiments of the coal pyrolysis device
according to the present invention based on the drawings, but the present invention
20 is not limited to only the following embodiments described based on the drawings.
[First Embodiment]
The following is a description of the first embodiment of the coal pyrolysis
device according to the present invention based on FIG. 1.
As illustrated in FIG. 1, a coal pyrolysis device 100 according to the present
25 embodiment includes a coal pyrolysis device main body 110 that is coal pyrolysis
means for obtaining pyrolyzed coal 2 by indirectly heating dried coal 1 with a
heating gas 11. The coal pyrolysis device main body 110 includes a hopper 111, an
inner cylinder (main body trunk) 112, an outer cylinder (jacket) 113, and a chute
114. The hopper 111 is a device that receives the dried coal 1 and supplies the
30 dried coal1 into a first end side (proximal end side) ofthe inner cylinder 112. The
inner cylinder 112 is rotatably supported. The inner cylinder 112 is a device that
rotates to cause the dried coal 1, which has been supplied into the inner cylinder
112, to move from the first end side to a second end side of the inner cylinder 112
while agitating the dried coal 1. The outer cylinder 113 is fixed and supported so
35 as to cover the outer peripheral surface of the inner cylinder 112 while enabling
the inner cylinder 112 to rotate. The outer cylinder 113 is a device that heats the
6
inner cylinder 112 with the heating gas 11, which is a heating medium, that is
delivered to the inside of the outer cylinder 113. The chute 114 is a device that is
connected to the second end side (distal end side) of the inner cylinder 112 so that
the inner cylinder 112 can rotate and is configured to drop the pyrolyzed coal 2,
5 which is obtained by subjecting the dried coal 1 to indirect heating with the
heating gas 11 to pyrolyze the dried coal 1, down from the second end side of the
inner cylinder 112. In other words, the coal pyrolysis device main body 110 is a
rotary kiln type device.
For example, low grade coal (low rank coal) having a high water content
10 such as lignite or subbituminous coal that has been supplied to a dryer (not
illustrated on the drawings), and that is dried by hot gas (150°C to 500°C) that is
distributed within the dryer so that the water content is substantially 0% can be
used as the dried coal 1.
A first end side (proximal end side) of a pyrolyzed gas exhaust line 115 is
15 connected to the top portion of the chute 114 of the coal pyrolysis device main
body 110. A second end side (distal end side) of the pyrolyzed gas exhaust line 115
is coupled to a combustion furnace 116, which is heating gas generation means.
Therefore, pyrolyzed gas (thermal decomposition gas) 15 released from the dried
coal 1 when the dried coal 1 is indirectly heated by the heating gas 11, and that
20 includes water vapor, carbon dioxide, low molecular weight hydrocarbons, tar, and
the like is exhausted from within the inner cylinder 112 to the combustion furnace
116 via the chute 114 and the pyrolyzed gas exhaust line 115.
The combustion furnace 116 is connected to a first end side (proximal end
side) of a heating gas delivery line 117. The combustion furnace 116 is connected
25 to a second end side (distal end side) of an exhaust gas recirculation line 121 that
is described in detail later. A second end side (distal end side) of the heating gas
delivery line 117 is connected to the inside of the outer cylinder 113 of the coal
pyrolysis device main body 110. The pyrolyzed gas 15 has a combustion heat
value of 5 to 15 MJ/Nm3
, and the pyrolyzed gas 15 delivered to the combustion
30 furnace 116 is processed by combustion together with supporting fuel (combustion
improver) 16 such as natural gas, and the exhaust gas 13. Therefore, the heating
gas (combustion gas) 11 generated within the combustion furnace 116 is delivered
to the inside of the outer cylinder 113 via the heating gas delivery line 117.
The outer cylinder 113 is connected to a first end side (proximal end side)
35 of an exhaust gas exhaust line 118. A boiler 118a, a flow rate adjustment valve
118b, and an exhaust fan 118c are provided from a first end side of the exhaust gas
exhaust line 118. The waste heat of heating gas 12 after heating the inner cy Iinder
7
112 is recovered by the boiler 118a. By controlling the flow rate adjustment valve
118b and the exhaust fan 118c, the heating gas 12 after heating the inner cylinder
112 flows from the first end side to the second end side (distal end side) of the
exhaust gas exhaust line 118.
5 A first end side (proximal end side) of a heating gas bypass line 119 is
connected between the proximal end side and the distal end side of the heating gas
delivery line 117. A second end side (distal end side) of the heating gas bypass line
119 is connected to the exhaust line 118 between the flow rate adjustment valve
118b and the exhaust fan 118c. A boiler 119a and a flow rate adjustment valve
10 119b are provided on the heating gas bypass line 119 from a first end side thereof.
The waste heat of the heating gas 11 is recovered by the boiler 119a. By
controlling the flow rate adjustment valve 119b and the exhaust fan 118c, a portion
of the heating gas 11 generated within the combustion furnace 116 is fed to the
second end side (distal end side) of the exhaust gas exhaust line 118 from the
15 heating gas delivery line 117 via the heating gas bypass line 119.
20
Therefore, by controlling the flow rate adjustment valves 118b, 119b and
the exhaust fan 118c, the exhaust gas 13 that is a mixed gas from mixing the
heating gases 11, 12 is fed to the second end side (distal end side) of the exhaust
gas exhaust line 118.
An exhaust gas processing device 13 0 that processes the exhaust gas 13 is
provided on the second end side (distal end side) of the exhaust gas exhaust line
118.
The exhaust gas processing device 130 includes a denitrification device
(denitrification means) 131, an electrical dust collector (dust removal means) 132,
25 and a desulfurization device ( desulfurization means) 13 3.
The denitrification device 131 removes nitrogen oxides (NOx) contained in
the exhaust gas 13. For example, a device that reduces nitrogen oxides such as
nitric oxide to nitrogen gas by spraying an aqueous solution of ammonium
chloride (not illustrated on the drawings) into the exhaust gas 13 can be used as
30 the denitrification device 131.
The electrical dust collector 132 separates and removes fine particulate
solid matter such as dust included in the exhaust gas 13.
The desulfurization device 133 removes sulfur oxides (SOx) included in the
exhaust gas 13. For example, a wet type device that converts sulfur oxides such as
35 sulfur dioxide into calcium sulfide or the like by blowing a calcium carbonate
slurry (not illustrated on the drawings) into the exhaust gas 13 can be used as the
desulfurization device 13 3. In this way, the SOx concentration of the exhaust gas
8
5
13 can be reduced to 50 ppm or less, so the reduction in performance due to S
poisoning the combustion catalyst that is described later can be minimized, and the
increase in operating cost due to replacement of the combustion catalyst can be
minimized.
Therefore, the NOx, dust, and SOx is removed from the exhaust gas 13 by
processing in the devices 131 to 133 as described above. The exhaust gas 13 that
has been processed in this way is exhausted outside the system.
A first end side (proximal end side) of the exhaust gas recirculation line
121 is connected to the exhaust gas exhaust line 118 between the exhaust fan 118 c
10 and the denitrification device 131. The second end side (distal end side) of the
exhaust gas recirculation line 121 is connected to the combustion furnace 116. A
flow rate adjustment valve 121 a is provided on the exhaust gas recirculation line
121. By controlling the exhaust fan 118c and the flow rate adjustment valve 121a,
a portion of the exhaust gas 13 flowing through the exhaust gas exhaust line 118 is
15 recirculated to the combustion furnace 116 via the exhaust gas recirculation line
121.
The coal pyrolysis device mam body 110 as described above further
includes an inert gas generation device 140 that generates inert gas 14 for
promoting the release of pyrolyzed gas 15 from the dried coal 1.
20 The inert gas generation device 140 includes an exhaust gas extraction line
141 provided connected at a first end side (proximal end side) thereof between the
second end side (distal end side) of the exhaust gas exhaust line 118 and the
desulfurization device 133. The second end side (distal end side) of the exhaust
gas extraction line 141 is connected to a gas inlet of a combustion catalyst
25 deoxygenation device (deoxygenation device) 142. A flow rate adjustment valve
141 a, an extraction fan 141 b, and a heat exchanger (heating means) 143 are
provided on the exhaust gas extraction line 141 from the first end side (proximal
end side) thereof. By controlling the flow rate adjustment valve 141a and the
extraction fan 141 b, a portion of the exhaust gas 13 that has passed through the
30 desulfurization device 133 flows to the exhaust gas exhaust line 141 via the
exhaust gas exhaust line 118.
A first end side (proximal end side) of an exhaust gas bypass line 144 is
connected to the exhaust gas exhaust line 141 between the extraction fan 141 b and
the heat exchanger 143. A second end side (distal end side) of the exhaust gas
35 bypass line 144 is connected to the exhaust gas extraction line 141 between the
heat exchanger 143 and the combustion catalyst deoxygenation device 142. A flow
rate adjustment valve 144a is provided on the exhaust gas bypass line 144. By
9
controlling the flow rate adjustment valves 141 a, 144a, and the extraction fan 141 b,
the proportion of the exhaust gas 13 flowing to the combustion catalyst
deoxygenation device 142 via the heat exchanger 143, and the exhaust gas 13
flowing to the combustion catalyst deoxygenation device 142 via the exhaust gas
5 bypass line 144 can be adjusted, so the temperature of the exhaust gas 13 flowing
to the combustion catalyst deoxygenation device 142 is adjustedo
A first end side (distal end side) of an oxygen consuming fuel supply line
145 that delivers an oxygen consuming fuel 17 for consuming oxygen in the
exhaust gas 13, for example a hydrocarbon fuel such as natural gas, is provided
10 connected to a gas inlet of the combustion catalyst deoxygenation device 142. A
tank 146 that stores the oxygen consuming fuel 1 7 is provided connected to a
second end side (proximal end side) of the oxygen consuming fuel delivery line
145. A flow rate adjustment valve 145a is provided on the oxygen consuming fuel
delivery line 145.
15 The combustion catalyst deoxygenation device 142 includes a pre-mixing
chamber (not illustrated on the drawings) capable of generating a pre-mixed gas
that is a mixture of the exhaust gas 13 and the oxygen consuming fuel 1 7, and a
combustion catalyst (not illustrated on the drawings) filling a location adjacent to
the pre-mixing chamber and coming into contact with the pre-mixed gas, that
20 causes the oxygen in the exhaust gas 13 to react with the oxygen consuming fuel
17 to consume the oxygen.
For example, a base material formed in a honeycomb shape and the catalyst
that includes a noble metal provided on the base material can be used as the
combustion catalyst. For example, the base material can be made of cordierite.
25 The noble metal may be platinum or palladium, for example. The method of
providing the noble metal on the base material can be, for example, an
impregnation and supporting method or a coating method.
A first end side (proximal end side) of an inert gas delivery line 147 that
delivers the inert gas 14 obtained by reducing the oxygen concentration of the
30 exhaust gas 13 obtained from the combustion catalyst deoxygenation device 142 is
provided connected to a gas outlet of the combustion catalyst deoxygenation
device 142. A second end side (distal end side) of the inert gas delivery line 147 is
connected to a first end side (proximal end side) of the inner cylinder 112 of the
coal pyrolysis device main body 110 via the heat exchanger 143. As described in
35 detail later, the temperature of the inert gas 14 is raised to 550°C to 750°C, and the
exhaust gas 13 can be preheated to the ignition temperature 150°C to 350°C of the
10
fuel 1 7 by the inert gas 14 in the heat exchanger 14 3. The inert gas 14 is delivered
to the inner cylinder 112 of the coal pyrolysis device main body 110.
A temperature sensor 141c that can measure the temperature of the exhaust
gas 13 flowing through the exhaust gas extraction line 141 is provided between the
5 distal end side of the exhaust gas extraction line 141 and the heat exchanger 143.
The temperature sensor 14lc is connected to the flow rate adjustment valve 144a
of the exhaust gas bypass line 144 via a temperature signal cable. The degree of
opening of the flow rate adjustment valve 144a can be adjusted on the basis of
information (exhaust gas 13 temperature) obtained by the temperature sensor 141c.
10 An oxygen sensor (oxygen concentration measurement means) 14 7 a capable
of measuring the oxygen concentration of the inert gas 14 flowing through the
inert gas supply line 14 7 is provided on the inert gas delivery line 14 7.
The oxygen sensor 147a is connected to the flow rate adjustment valve
145a provided on the oxygen consuming fuel delivery line 145 via an oxygen
15 concentration signal cable. The degree of opening of the flow rate adjustment
valve 145a can be adjusted on the basis of information (oxygen concentration of
the inert gas 14) obtained by the oxygen sensor 14 7 a. In other words, the coal
pyrolysis device 100 includes a control device (fuel addition quantity control
means) that is not illustrated on the drawings, and the control device can control
20 the quantity of oxygen consuming fuel 17 added by the oxygen consuming fuel
delivery line 145, the flow rate adjustment valve 145a, and the tank 146 so that the
oxygen concentration of the inert gas 14 is, for example, 1.5% or less, on the basis
of the information (oxygen concentration of the inert gas 14) obtained by the
oxygen sensor 14 7 a.
25 In the present embodiment as described above, exhaust means include the
exhaust gas exhaust line 118, the boiler 118a, the flow rate adjustment valve 118b,
the exhaust fan 118c, the exhaust gas processing device 130, and the like. Gas
extraction means include the exhaust gas extraction line 141, the flow rate
adjustment valve 14la, the extraction fan 14lb, the heat exchanger 143, the
30 exhaust gas bypass line 144, the flow rate adjustment valve 144a, and the like.
Fuel addition means include the oxygen consuming fuel delivery line 145, the flow
rate adjustment valve 145a, the tank 146, and the like. Deoxygenation means
include the combustion catalyst deoxygenation device 142, the fuel addition means,
and the like. Low-oxygen concentration gas delivery means include the exhaust
35 gas extraction line 141, the flow rate adjustment valve 14la, the extraction fan
14lb, the inert gas delivery line 147, and the like. Low-oxygen concentration gas
supply means include the low-oxygen concentration gas delivery means, the
11
5
deoxygenation means~ and the like. The coal pyrolysis device 100 includes the
coal pyrolysis device main body 110, the exhaust means, the gas extraction means~
the low-oxygen concentration gas supply means~ the fuel addition control means~
and the like.
The following is a description of a coal pyrolysis processing method for
pyrolysis of dried coal 1 using the coal pyrolysis device 100 according to the
present embodiment configured in this way.
When dried coal 1 is fed into the hopper 111 of the coal pyrolysis device
main body 11 0~ the dried coal 1 within the hopper 111 is supplied from the first
10 end side (proximal end side) to the interior of the inner cylinder 112. The dried
coal 1 within the inner cylinder 112 is moved from the first end side (proximal end
side) to the second end side (distal end side) of the inner cylinder 112 by the
rotation of the inner cylinder 112. The inner cylinder 112 is heated by the heating
gas 11 delivered within the outer cylinder 113, so when the dried coal 1 is moving
15 from the first end side to the second end side of the inner cylinder 112~ the dried
coal 1 is indirectly heated (300°C to 500°C) by the heating gas 1 L In this way, the
pyrolyzed gas (thermal decomposition gas) 15 that includes water vapor, carbon
dioxide, low molecular weight hydrocarbons, tar, and the like, together with
minute quantities of sulfur is released from the dried coal 1, and the separated
20 pyrolyzed coal 2 is obtained.
The pyrolyzed coal 2 drops down from the second end side of the inner
cylinder 112 via the chute 114. The pyrolyzed coal 2 that has dropped down from
the chute 114 is supplied to a cooler that is not illustrated on the drawings, for
example, and is cooled (150°C to 200°C). Active sites (radicals) produced by
25 pyrolysis are inactivated by an inactivation processing device (not illustrated on
the drawings), then the product is mixed with binder and water by a mixing device
(not illustrated on the drawings), and coal briquettes are formed by compression
and molding in a molding device (not illustrated on the drawings).
The pyrolyzed gas 15 separated and removed from the dried coal 1 IS
30 delivered to the combustion furnace 116 via the pyrolyzed gas exhaust line 115.
Within the combustion furnace 116, the heating gas (combustion gas) 11 1s
generated by combustion processing of the pyrolyzed gas 15 together with the
supporting fuel 16 and the exhaust gas 13. In the combustion furnace 116, the ratio
of the supporting fuel 16 and the air flow rate is controlled by controlling the
35 combustion air ratio, and normally the combustion excess air ratio is set to 1.0 or
higher in order to prevent generation of unburned components such as soot, and
prevent lowering of the combustion efficiency. Therefore, the oxygen
12
concentration in the heating gas (combustion gas) 11 is in the order of 2 to 5%0
By controlling the flow rate adjustment valve 118b and the exhaust fan 118c, a
portion of the heating gas 11 is delivered to within the outer cylinder 113 through
the heating gas deli very line 11 7, and after the inner cylinder 112 is heated, the
5 heating gas 12 flows to the distal end side of the exhaust gas exhaust line 118 from
within the outer cylinder 113 0 The remainder of the heating gas 11 is delivered to
the exhaust gas exhaust line 118 via the heating gas bypass line 119 o The heating
gas 12, from which the waste heat has been recovered by the boiler 118a, has a
specific temperature (for example, 350°C)o The heating gas 11 flowing through the
10 heating gas bypass line 119, from which the waste heat has been recovered by the
boiler 119a, has a specific temperature (for example, 350°C)o Exhaust gas (mixed
gas) 13 that is a mixture of the heating gas 12 from which the waste heat has been
recovered in the boiler 118a and the heating gas 11 from which the waste heat has
been recovered in the boiler 119a is delivered to the second end side (distal end
15 side) of the exhaust gas exhaust line 118 by the exhaust fan 118c, and is processed
in the exhaust gas processing device 13 0.
A portion of the exhaust gas 13 that flows through the exhaust gas exhaust
line 118 is recirculated to the combustion furnace 116 via the exhaust gas
recirculation line 121, by controlling the flow rate adjustment valve 121ao
20 The exhaust gas 13 that is not circulated to the exhaust gas recirculation
line 121 but flows to the distal end side of the exhaust gas exhaust line 118 has
NOx removed by the denitrification device 131, solid matter removed by the
electrical dust collector 132, and SOx removed by the desulfurization device 13 3,
and is released outside the systemo
25 When producing the pyrolyzed coal 2 from the dried coal 1 in this way, the
quantity of inert gas that promotes release of the pyrolyzed gas 15 from the dried
coal 1 increases in accordance with the quantity of pyrolyzed coal 2 produced, and
the capacity of the PSA or cryogenic separation device that produces the inert gas
is increased accordingly, so the plant cost and the electrical power cost are
30 increasedo
35
In the coal pyrolysis device 100 according to this embodiment that
addresses this problem, in order to reuse the exhaust gas 13 exhausted outside the
system through the exhaust gas exhaust line 118, the following operation is
additionally carried out.
By controlling the flow rate adjustment valve 141 a and the extraction fan
141 b provided on the exhaust gas extraction line 141, a portion of the exhaust gas
13 that has passed through the desulfurization device 13 3 is not exhausted outside
l3
the system via the exhaust gas exhaust line 118 but flows to the exhaust gas
extraction line 141. By controlling the flow rate adjustment valve 144a on the
basis of the information (temperature of the exhaust gas 13) obtained from the
temperature sensor 141 c, the proportion of the exhaust gas 13 flowing to the
5 combustion catalyst deoxygenation device 142 via the heat exchanger 143, and the
exhaust gas 13 flowing to the combustion catalyst deoxygenation device 142 via
the exhaust gas bypass line 144 is adjusted, so the exhaust gas 13, which has been
preheated to the ignition temperature 150°C to 350°C of the oxygen consuming
fuel 17 in the heat exchanger 143, flows to the combustion catalyst deoxygenation
10 device 142. By providing the exhaust gas bypass line 144 and the flow rate
adjustment valve 144a, the preheating temperature of the exhaust gas 13 can be
adjusted accordingly, even if the ignition temperature of the oxygen consuming
fuel 17 rises due to degradation in the performance of the combustion catalyst of
the combustion catalyst deoxygenation device 142 with time.
15 By controlling the flow rate adjustment valve 145a on the basis of the
information (oxygen concentration of the inert gas 14) obtained from the oxygen
sensor 147a, a specific quantity of oxygen consuming fuel 17 is delivered to the
combustion catalyst deoxygenation device 142. In other words, the oxygen
concentration of the inert gas 14 can be reduced to a specific value or lower by
20 feedback control. Preferably, the specific value is 1.5% or less. In this way, the
pyrolysis loss due to the oxygen in the inert gas 14 reacting with the dried coal 1
can be minimized.
In the combustion catalyst deoxygenation device 142, the mixed gas
obtained by pre-mixing the exhaust gas 13 and the oxygen consuming fuel 17
25 comes into contact with the combustion catalyst, which causes the oxygen
consuming fuel 17 to burn and the oxygen in the exhaust gas 13 to be consumed,
to reduce the oxygen concentration of the exhaust gas 13. At this time, the
temperature of the inert gas 14 formed by reducing the oxygen concentration of
the exhaust gas 13 is raised to 550°C to 750°C by the heat of reaction. The inert
30 gas 14 is supplied to the inner cylinder 112 of the coal pyrolysis device main body
110 via the inert gas delivery line 14 7. The quantity of inert gas 14 to be delivered
is adjusted to 0.1 N.m3 to 0.3 N.m3 per 1 kg of dried coal 1 supplied to the inner
cylinder 112. In this way, the partial pressure of the pyrolyzed gas 15 at the
surface of the dried coal 1 is reduced, which promotes the release of the pyrolyzed
35 gas 15 from the dried coal 1.
Therefore, according to the coal pyrolysis device 100 of the present
embodiment, it is possible to process the exhaust gas 13 produced by the coal
14
pyrolysis device main body 110 in the combustion catalyst deoxygenation device
142 to obtain the inert gas 14. The cost of the combustion catalyst deoxygenation
device 142 itself and the operating cost thereof are lower than those of a PSA or
cryogenic separation device, so the inert gas 14 that promotes release of the
5 pyrolyzed gas 15 from the dried coal 1 can be obtained at low cost.
Also, the temperature of the inert gas 14 obtained from the combustion
catalyst deoxygenation device 142 is about 550°C to 750°C, so the dried coal 1
within the inner cylinder 112 is directly heated by the inert gas 14 in addition to
being indirectly heated by the heating gas 11. In other words, in addition to the
10 heating gas 11, the inert gas 14 can be used as the heat source (pyrolysis heat
source) when pyrolyzing the dried coal 1. In this way, the quantity of heat supplied
from outside the coal pyrolysis device main body 110 as the pyrolysis heat source,
in other words the flow rate of the heating gas 11, can be reduced, and the heat
load of the coal pyrolysis device main body 110 can be reduced. As a result, the
15 total length of the outer cylinder 113 (coal pyrolysis device main body 11 0) can be
reduced compared with when the heating gas 11 only is used as the pyrolysis heat
source.
[Second Embodiment]
The following is a description of a second embodiment of the coal pyrolysis
20 device according to the present invention based on FIGS. 2A and 2B.
The present embodiment is configured by modifying the deoxygenation
device provided in the first embodiment as described above and illustrated in FIG.
1. The rest of the configuration is generally the same as that described above and
illustrated in FIG. 1, so the same equipment is given the same reference numeral
25 and duplicated descriptions are omitted as appropriate.
As illustrated in FIG. 2A and 2B, a coal pyrolysis device 200 according to
the present embodiment includes an inert gas generation device 240 that generates
inert gas 24 for promoting the release of pyrolyzed gas 15 from dried coal 1.
The inert gas generation device 240 includes an exhaust gas extraction line
30 241 provided connected at a first end side (proximal end side) thereof between the
second end side (distal end side) of the exhaust gas exhaust line 118 and the
desulfurization device 13 3. The second end side (distal end side) of the exhaust
gas extraction line 241 is connected to a gas inlet of an alternating combustion
deoxygenation device (deoxygenation device) 242. A flow rate adjustment valve
35 241 a and an extraction fan 241 b are provided on the exhaust gas extraction line
241 from the first end side (proximal end side) thereof. By controlling the flow
15
rate adjustment valve 241 a and the extraction fan 241 b, a portion of the exhaust
gas 13 that has passed through the desulfurization device 13 3 flows to the exhaust
gas extraction line 241 via the exhaust gas exhaust line 118.
A first end side (distal end side) of an oxygen consuming fuel delivery line
5 245 that delivers an oxygen consuming fuel 27 for consuming oxygen in the
exhaust gas 13, for example, a hydrocarbon fuel such as natural gas, is provided
connected in the vicinity of a gas inlet (a side wall in the vicinity of the top
portion of a device main body 242b that is described later) of the alternating
combustion deoxygenation device 242. A tank 246 that stores the oxygen
10 consuming fuel 27 is provided connected to a second end side (proximal end side)
of the oxygen consuming fuel supply line 245. A flow rate adjustment valve 245a
is provided on the oxygen consuming fuel delivery line 245.
The alternating combustion deoxygenation device 242 includes the device
main body 242b provided with a combustion chamber 242a in the interior thereof.
15 A burner 242c is provided in the lower portion of the device main body 242b.
Temperature maintaining fuel 28 and temperature maintaining fuel combustion air
29 are supplied to the burner 242c. The temperature maintaining fuel 28 is burned
in the burner 242c, thereby maintaining the temperature of the atmosphere in the
combustion chamber 242a at a high temperature of about 1200°C. In this way,
20 even when the concentration of oxygen in the exhaust gas 13 is a low
concentration of 2 to 5%, the oxygen consuming fuel 27 can be stably burned with
the low concentration of oxygen contained in the exhaust gas 13.
An alternating type heat exchanger 242d is provided in the device main
body 242b. The alternating type heat exchanger 242d includes a first heat
25 exchanger main body 242da and a second heat exchanger main body 242db that
are provided adjacently. The second end side (distal end side) of the exhaust gas
extraction line 241 is connected to the first heat exchanger main body 242da. A
first end side (proximal end side) of an inert gas delivery line 247 is connected to
the second heat exchanger main body 242db. A rotary valve 242e is provided in
30 the vicinity of the distal end side of the exhaust gas extraction line 241 and in the
vicinity of the proximal end side of the inert gas supply line 24 7, so that the distal
end side of the exhaust gas extraction line 241 and the proximal end side of the
inert gas delivery line 247 can be switched using the rotary valve 242e. In this way,
the exhaust gas 13 delivered to the alternating combustion deoxygenation device
35 242 from the exhaust gas extraction line 241 is preheated to 800°C to 1 000°C by
the alternating type heat exchanger 242d provided at the gas inlet of the
16
alternating combustion deoxygenation device 242 and supplied to the combustion
chamber 242a of the alternating combustion deoxygenation device 2420
By burning the oxygen consuming fuel 27 in the burner 242c together with
the temperature maintaining fuel 28, the oxygen in the exhaust gas 13 is consumed
5 and the inert gas 24, which is a gas with a low-oxygen concentration, is generatedo
A second end side (distal end side) of the inert gas delivery line 24 7 is
connected to the first end side (proximal end side) of the inner cylinder 112 of the
coal pyrolysis device main body 11 Oo In this way, the inert gas 24 whose
temperature has become 70°C to 150°C in the alternating type heat exchanger
10 242d provided at the gas outlet of the alternating combustion deoxygenation
device 242 is delivered to the inner cylinder 112 of the coal pyrolysis device main
body 1100
An oxygen sensor (oxygen concentration measuring means) 247a capable of
measuring the oxygen concentration of the inert gas 24 flowing through the inert
15 gas delivery line 247 is provided on the inert gas supply line 2470
The oxygen sensor 247a is connected to the flow rate adjustment valve
245a provided on the oxygen consuming fuel delivery line 245 via an oxygen
concentration signal cableo The degree of opening of the flow rate adjustment
valve 245a can be adjusted on the basis of information (oxygen concentration of
20 the inert gas 24) obtained by the oxygen sensor 247ao In other words, the coal
pyrolysis device 200 includes a control device (fuel addition control means) that is
not illustrated on the drawings, and the control device can control the quantity of
oxygen consuming fuel 27 added by the oxygen consuming fuel delivery line 245,
the flow rate adjustment valve 245a, and the tank 246 so that the oxygen
25 concentration of the inert gas 24 is, for example, 1 05% or less, on the basis of the
information (oxygen concentration of the inert gas 24) obtained by the oxygen
sensor 24 7 ao
In the present embodiment as described above, exhaust means include the
exhaust gas extraction line 241, the flow rate adjustment valve 241 a, the extraction
30 fan 241 b, and the like. Fuel addition means include the oxygen consuming fuel
delivery line 245, the flow rate adjustment valve 245a, the tank 246, and the like.
Deoxygenation means include the alternating combustion deoxygenation device
242, the fuel addition means, and the like. Low-oxygen concentration gas delivery
means include the exhaust gas extraction line 241, the flow rate adjustment valve
35 241 a, the extraction fan 241 b, the inert gas delivery line 24 7, and the like. Lowoxygen
concentration gas supply means include the low-oxygen concentration gas
delivery means, the deoxygenation means, and the like. The coal pyrolysis device
17
200 includes the coal pyrolysis device main body 110, the exhaust means, the gas
extraction means, the low-oxygen concentration gas supply means, the fuel
addition control means, and the like. The other means each include similar
equipment as the first embodiment described above.
5 In the coal pyrolysis device 200 according to the present embodiment that
10
includes the inert gas generation device 240 as described above, it is possible to
produce the pyrolyzed coal 2 from the dried coal 1 by causing the same central
operation as the coal pyrolysis device 1 00 according to the first embodiment as
described previously.
Also, by controlling the flow rate adjustment valve 241 a and the extraction
fan 241 b provided on the exhaust gas extraction line 241, a portion of the exhaust
gas 13 that has passed through the desulfurization device 13 3 via the exhaust gas
exhaust line 118 is not exhausted outside the system but flows to the exhaust gas
extraction line 241. By controlling the flow rate adjustment valve 245a on the
15 basis of the information (oxygen concentration of the inert gas 24) obtained from
the oxygen sensor 247a, a specific quantity of oxygen consuming fuel 27 is
delivered to the alternating combustion deoxygenation device 242. In other words,
the oxygen concentration of the inert gas 24 can be reduced to a specific value or
lower by feedback control. Preferably, the specific value is 1.5% or less. In this
20 way, the pyrolysis loss due to the oxygen in the inert gas 24 reacting with the dried
coal 1 can be minimized.
By preheating the exhaust gas 13 to 800°C to 1000°C in the alternating type
heat exchanger 242d and delivering it to the combustion chamber 242a within the
alternating combustion deoxygenation device 242, the temperature maintaining
25 fuel 28 is burned together with the oxygen consuming fuel 27, the oxygen within
the exhaust gas 13 is consumed, and the oxygen concentration of the exhaust gas
13 is reduced. The temperature of the inert gas 24, which is the exhaust gas 13
with a reduced oxygen concentration, becomes 70°C to 150°C in the alternating
type heat exchanger 242d, and is delivered to the inner cylinder 112 of the coal
30 pyrolysis device main body 110 via the inert gas delivery line 24 7. The quantity of
inert gas 24 to be delivered is adjusted to 0.1 N.m3 to 0.3 N.m3 per 1 kg of dried
coal 1 supplied to the inner cylinder 112. In this way, the partial pressure of the
pyrolyzed gas 15 at the surface of the dried coal 1 is reduced, which promotes the
release of the pyrolyzed gas 15 from the dried coal 1.
35 In this way, in the present embodiment, by processing the exhaust gas 13
produced in the coal pyrolysis device main body 110 using the alternating
18
combustion deoxygenation device 242, it can be used as the inert gas 24 to
promote the release of the pyrolyzed gas 15 from the dried coal 1 o
Therefore, according to the coal pyrolysis device 200 of to the present
embodiment, it is possible to process the exhaust gas 13 produced by the coal
5 pyrolysis device main body 11 0 in the alternating combustion deoxygenation
device 242 to obtain the inert gas 240 The cost of the alternating combustion
deoxygenation device 242 itself and the operating cost are lower than those of a
PSA or cryogenic separation device, so the inert gas 24 that promotes release of
the pyrolyzed gas 15 from the dried coal 1 can be obtained at low cosL
10 Also, the temperature of the inert gas 24 obtained from the alternating
combustion deoxygenation device 242 is about 70°C to 150°C, so the dried coal 1
within the inner cylinder 112 is directly heated by the inert gas 24 in addition to
being indirectly heated by the heating gas 11 0 In other words, in addition to the
heating gas 11, the inert gas 24 can be used as the heat source (pyrolysis heat
15 source) when pyrolyzing the dried coal 10 In this way, the quantity of heat supplied
from outside the coal pyrolysis device main body 110 as the pyrolysis heat source,
in other words, the flow rate of the heating gas 11, can be reduced, and the heat
load of the coal pyrolysis device main body 110 can be reducedo As a result, the
total length of the outer cylinder 113 (coal pyrolysis device main body 11 0) can be
20 reduced compared with when the heating gas 11 only is used as the pyrolysis heat
sourceo
[Third embodiment]
The following is a description of a third embodiment of the coal pyrolysis
device according to the present invention based on FIG 30
25 The present embodiment is configured by modifying the deoxygenation
device provided in the first embodiment as described above and illustrated in FIG
1 o The rest of the configuration is generally the same as that described above and
illustrated in FIG 1, so the same equipment is given the same reference numeral
and duplicated descriptions are omitted as appropriate<
30 As illustrated in FIG 3, a coal pyrolysis device 300 according to the present
embodiment includes an inert gas generation device 340 that generates from the
exhaust gas 13 inert gas (not illustrated on the drawings) for promoting the release
of pyrolyzed gas 15 from the dried coal 1.
The inert gas generation device 340 includes an exhaust gas extraction line
35 341 provided connected at a first end side (proximal end side) thereof between the
19
second end side (distal end side) of the exhaust gas exhaust line 118 and the
desulfurization device 133.
A second end side (distal end side) of the inert gas supply line 341 is
connected to the first end side (proximal end side) of the inner cylinder 112 of the
5 coal pyrolysis device main body 110. A flow rate adjustment valve 341a and an
extraction fan 341 b are provided on the exhaust gas extraction line 341 from the
proximal end side thereof.
In addition, a flow rate meter (exhaust gas flow rate measuring means) 341c
that measures the flow rate of the exhaust gas 13 flowing through the exhaust gas
10 extraction line 341, and an oxygen sensor (oxygen concentration measuring
means) 341 d that measures the oxygen concentration of the exhaust gas 13 flowing
through the exhaust gas extraction line 341 are provided on the exhaust gas
extraction line 341.
In addition, a first end side (distal end side) of an oxygen consuming fuel
15 supply line 345 that delivers an oxygen consuming fuel 37 for consuming oxygen
in the exhaust gas 13, for example a hydrocarbon fuel such as natural gas, is
provided connected to the exhaust gas extraction line 341 between the oxygen
sensor 341 d and the second end side (distal end side) of the exhaust gas extraction
line 341. A tank 346 that stores the oxygen consuming fuel 3 7 is provided
20 connected to a second end side (proximal end side) of the oxygen consuming fuel
delivery line 345. A flow rate adjustment valve 345a is provided on the oxygen
consuming fuel delivery line 345.
The inert gas generation device 340 further includes a control device
(computer) 348 connected to the flow rate meter 341c via a flow rate signal cable,
25 connected to the oxygen sensor 34ld via an oxygen concentration signal cable, and
connected to the flow rate adjustment valve 345a via a control signal cable. The
control device 348 controls the degree of opening of the flow rate adjustment
valve 345a on the basis of information (flow rate of the exhaust gas 13) obtained
from the flow rate meter 341c and information (oxygen concentration of the
30 exhaust gas 13) obtained from the oxygen sensor 341 d, to adjust the supply flow
rate of the oxygen consuming fuel 37 to be delivered to the exhaust gas extraction
line 341.
In the present embodiment as described above, gas extraction means
include the exhaust gas extraction line 341, the flow rate adjustment valve 341 a,
35 the exhaust fan 341 b, and the like. Fuel addition means include the oxygen
consuming fuel delivery line 345, the flow rate adjustment valve 345a, the tank
346, and the like. The gas extraction means and the like form heating gas delivery
20
means. Low-oxygen concentration gas supply means include the heating gas
delivery means, the fuel addition means, and the like. The control device 348
forms fuel addition quantity control meanso The coal pyrolysis device 300 include
the coal pyrolysis device main body 110, the exhaust means, the gas extraction
5 means, the low-oxygen concentration gas supply means, the fuel addition control
means, and the likeo The other means each include similar equipment as the first
embodiment described aboveo
In the coal pyrolysis device 300 according to the present embodiment that
includes the inert gas generation device 340 as described above, it is possible to
10 produce the pyrolyzed coal 2 from the dried coal 1 by causing the same central
operation as the coal pyrolysis device 1 00 according to the first embodiment as
described previouslyo
Also, by controlling the flow rate adjustment valve 341 a and the extraction
fan 341 b provided on the exhaust gas extraction line 341, a portion of the exhaust
15 gas 13 that has passed through the desulfurization device 13 3 is not exhausted
outside the system but flows to the exhaust gas extraction line 341 via the exhaust
gas exhaust line 118. By controlling the flow rate adjustment valve 345a on the
basis of information (flow rate of the exhaust gas 13) obtained from the flow rate
meter 341 c and information (oxygen concentration of the exhaust gas 13) obtained
20 from the oxygen sensor 341 d, a specific quantity of the oxygen consuming fuel 3 7
is delivered to the first end side (proximal end side) of the inner cylinder 112 of
the coal pyrolysis device main body 110 via the exhaust gas extraction line 341.
The control device 348 calculates the oxygen flow rate of the exhaust gas 13 on
the basis of information (flow rate of the exhaust gas 13) obtained from the flow
25 rate meter 341 c and information (oxygen concentration of the exhaust gas 13)
obtained from the oxygen sensor 34ld, and performs feedback control of the flow
rate of the oxygen consuming fuel 3 7 so that the flow rate of the oxygen
consuming fuel 37 is equal to or greater than equivalence of the calculated oxygen
flow rate of the exhaust gas 13, in other words, so that the excess oxygen ratio of
30 the oxygen consuming fuel 38 is LO or lesso
The inner cylinder 112 is heated by the heating gas 11 delivered to within
the outer cylinder 113, so the exhaust gas 13 and the oxygen consuming fuel 3 7
supplied to within the inner cylinder 112 is heated, the exhaust gas 13 and the
oxygen consuming fuel 37 react in priority over the exhaust gas 13 and the dried
35 coal 1, so the oxygen in the exhaust gas 13 is consumed and the oxygen
concentration of the exhaust gas 13 is reduced. By reducing the oxygen
21
concentration of the exhaust gas 13, it is used as inert gas within the inner cylinder
112.
In this way, in the present embodiment, the exhaust gas 13 produced by the
coal pyrolysis device main body 110 is premixed with the oxygen consuming fuel
5 3 7, and by heating the dried coal 1 during pyrolysis using the heat source, the
oxygen in the exhaust gas 13 is consumed and its oxygen concentration is reduced,
so it can be used as the inert gas to promote the release of the pyrolyzed gas 15
from the dried coal 1.
Therefore, according to the coal pyrolysis device 300 of the present
10 embodiment, by adjusting the quantity of the oxygen consuming fuel 3 7 to be
delivered to the exhaust gas 13 on the basis of information (flow rate of the
exhaust gas 13, oxygen concentration of the exhaust gas 13) regarding the exhaust
gas 13 flowing through the exhaust gas extraction line 341, so that the oxygen in
the exhaust gas 13 within the inner cylinder 112 of the coal pyrolysis device main
15 body 110 is burned by the oxygen consuming fuel 3 7 and the oxygen concentration
is reduced, the inert gas can be obtained. The cost of the flow rate meter 341 c, the
oxygen sensor 341d, the oxygen consumption fuel supply line 345, the flow rate
adjustment valve 345a, and the control device 348 and the operating cost are less
compared with those of a PSA, a cryogenic separation device, or the like.
20 Therefore, the inert gas that promotes release of the pyrolyzed gas 15 from the
dried coal 1 can be obtained at low cost.
The oxygen consuming fuel 3 7 reacts with the oxygen in the exhaust gas 13
within the inner cylinder 112 and generates heat, so during pyrolysis of the dried
coal 1, the heat of reaction between the oxygen in the exhaust gas 13 and the
25 oxygen consuming fuel 37 can be used as a heat source (pyrolysis heat source) in
addition to the heating gas 11. In this way, the quantity of heat supplied from
outside the coal pyrolysis device main body 110 as the pyrolysis heat source, in
other words, the flow rate of the heating gas 11, can be reduced, and the heat load
of the coal pyrolysis device main body 110 can be reduced. As a result, the total
30 length of the outer cylinder 113 (coal pyrolysis device main body 11 0) can be
reduced compared with when the heating gas 11 only is used as the pyrolysis heat
source.
[Other Embodiments]
Note that in the above, the coal pyrolysis device 100, 200, 300 have been
35 described with a single exhaust fan 118c provided in the exhaust gas exhaust line
118, but a coal pyrolysis device in which a portion of the exhaust gas exhaust line
22
118 is divided into two systems, and an exhaust fan and a flow rate adjustment
valve are provided in each system is also possible.
Reference Signs List
5 1 Dried coal
2 Pyrolyzed coal
11 Heating gas
12 Heating gas
13 Exhaust gas (mixed gas)
10 14 Inert gas (low-oxygen concentration gas)
15 Pyrolyzed gas (thermal decomposition gas)
16 Supporting fuel (combustion improver)
1 7 Oxygen consuming fuel
24 Inert gas (low-oxygen concentration gas)
15 27 Oxygen consuming fuel
28 Temperature maintaining fuel
29 Temperature maintaining fuel combustion air
3 7 Oxygen consuming fuel
110 Coal pyrolysis device main body
20 111 Hopper
112 Inner cylinder (main body trunk)
113 Outer cylinder (jacket)
114 Chute
115 Pyrolyzed gas exhaust line
25 116 Combustion furnace
117 Heating gas delivery line
118 Exhaust gas exhaust line
118a Boiler
118b Flow rate adjustment valve
30 118c Exhaust fan (outlet blower)
119 Heating gas bypass line
119a Boiler
119b Flow rate adjustment valve
121 Exhaust gas recirculation line
35 12la Flow rate adjustment valve
130 Exhaust gas processing device
131 Denitrification device
23
132 Electric dust collector
133 Desulfurization device
140 Inert gas generation device
141 Exhaust gas extraction line
5 14la Flow rate adjustment valve
141b Extraction fan (suction fan)
141 c Temperature sensor
142 Combustion catalyst deoxygenation device (deoxygenation device)
143 Heat exchanger
10 144 Exhaust gas bypass line
144a Flow rate adjustment valve
145 Oxygen consuming fuel delivery line
145a Flow rate adjustment valve
146 Tank
15 14 7 Inert gas supply line
147a Oxygen sensor
240 Inert gas generation device
241 Exhaust gas extraction line
241 a Flow rate adjustment valve
20 241 b Extraction fan (suction fan)
242 Alternating combustion deoxygenation device (deoxygenation device)
242a Combustion chamber
242b Device main body
242c Burner
25 242d Alternating type heat exchanger
242da First heat exchanger main body
242db Second heat exchanger main body
242e Rotary valve
245 Oxygen consuming fuel delivery line
30 245a Flow rate adjustment valve
246 Tank
24 7 Inert gas delivery line
247a Oxygen sensor
340 Inert gas generation device
35 341 Exhaust gas extraction line
341 a Flow rate adjustment valve
341 b Extraction fan (suction fan)
24
34lc Flow rate meter
34ld Oxygen sensor
345 Oxygen consuming fuel delivery line
345a Flow rate adjustment valve
5 346 Tank
348 Control device (computer)

WE CLAIM:
1. A coal pyrolysis device comprising:
a rotary kiln type coal pyrolysis device mam body that rotatably
supports an inner cylinder inside an outer cylinder, the rotary kiln type coal
pyrolysis device main body being configured to supply coal into the inner
cylinder from a first end side of the inner cylinder as well as supplying
heating gas into the outer cylinder and rotate the inner cylinder to heat and
pyrolyze the coal while moving the coal from the first end side of the inner
cylinder to a second end side and agitating the coal, and to output the
pyrolyzed coal and pyrolyzed gas from the second end side of the inner
cylinder;
exhaust means provided connected to the outer cylinder, the exhaust
means being for exhausting the heating gas within the outer cylinder;
gas extraction means for extracting a portion of the heating gas
exhausted by the exhaust gas means; and
low-oxygen concentration gas supply means for supplying the
heating gas extracted by the gas extraction means into the inner cylinder so
that a concentration of oxygen contained in the heating gas is reduced.
2. The coal pyrolysis device according to claim 1, wherein
3.
4.
the low-oxygen concentration gas supply means include
deoxygenation means for removing the oxygen contained in the heating gas,
and low-oxygen concentration gas delivery means for delivering the lowoxygen
concentration gas obtained from the deoxygenation means into the
inner cylinder.
The coal pyrolysis device according to claim 2, wherein
the deoxygenation means include fuel addition means for adding fuel
to the heating gas, and a combustion catalyst provided so as to come into
contact with the heating gas to which the fuel has been added.
The coal pyrolysis device according to claim 3, further comprising
heating means provided in the gas extraction means, the heating
means being for heating the heating gas.
The coal pyrolysis device according to claim 3, further comprising
26
5
10
15
20
25
30
35
6.
70
80
desulfurization means provided m the exhaust means, the
desulfurization means being for removing sulfur oxide contained in the
heating gas.
The coal pyrolysis device according to claim 4, further comprising:
oxygen concentration measuring means for measuring an oxygen
concentration of the low-oxygen concentration gas delivered by the lowoxygen
concentration gas delivery means; and
fuel addition quantity control means for controlling a quantity of the
fuel added by the fuel addition means based on information obtained by the
oxygen concentration measuring means so that the oxygen concentration of
the low-oxygen concentration gas is 1 .5% or lesso
The coal pyrolysis device according to claim 2, wherein
the deoxygenation means include an alternating combustion device
that includes a combustion chamber to which the heating gas is delivered, a
burner provided within the combustion chamber, and an alternating type
heat exchanger provided within the combustion chamber in a location to
which the heating gas is delivered, and fuel addition means for adding fuel
to the combustion chamber.
The coal pyrolysis device according to claim 7, further comprising:
oxygen concentration measuring means for measuring the
concentration of oxygen contained in the heating gas delivered by the lowoxygen
concentration gas delivery means; and
fuel addition quantity control means for controlling a quantity of the
fuel added by the fuel addition means based on information obtained by the
oxygen concentration measuring means so that the oxygen concentration of
the low-oxygen concentration gas is 1.5% or less.
9. The coal pyrolysis device according to claim 1, wherein
the low-oxygen concentration gas supply means include heating gas
delivery means for delivering the heating gas extracted by the gas
extraction means into the inner cylinder, and fuel addition means for adding
fuel to the heating gas delivered into the inner cylinder by the heating gas
delivery means.
27
5
10
15
1 0" The coal pyrolysis device according to claim 9, further comprising:
heating gas flow rate measuring means for measuring a flow rate of
the heating gas delivered by the heating gas delivery means;
oxygen concentration measuring means for measuring a
concentration of oxygen contained in the heating gas delivered by the
heating gas delivery means; and
fuel addition quantity control means for controlling a quantity of the
fuel added by the fuel addition means based on information obtained by the
heating gas flow rate measuring means and the oxygen concentration
measuring means so that the oxygen concentration of the low-oxygen
concentration gas is 1.5% or less"