JP2004204109A - Coal gasification combined facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide coal gasification combined facility in which states of nitrogen oxide (NOx) and sulfur oxide (SOx), soot and dust, etc., can nearly be equivalent to those of exhaust gas of a combined facility equipped with a gas turbine for burning a fuel such as natural gas. <P>SOLUTION: The coal gasification combined facility is equipped with a gas turbine 6 in which a gas fuel gasified in a coal gasification furnace 1 is burned, a discharged heat recovery boiler 7 in which a exhaust gas of the gas turbine 6 fed is thermally recovered and a denitration catalyst 25 is provided in a smoke passage and an activated carbon treatment means 32 in which the discharged gas thermally recovered by the exhaust heat-recovering boiler 7 is introduced and a catalyst layer 33 of an activated carbon fiber layer is provided. The coal gasification combined facility enables removal of soot and dust and sulfur oxide (SOx) by the catalyst layer 33 of the exhaust gas passing through the exhaust heat recovering boiler 7 and reduces soot and dust and the sulfur oxide (SOx) of the exhaust gas and improves the environmental performance. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coal gasification combined facility including a gas turbine that burns a fuel obtained by gasifying coal.
[0002]
[Prior art]
BACKGROUND ART A coal gasification combined facility including a gas turbine that burns a fuel obtained by gasifying coal is known. In a coal gasification combined facility, coal is gasified in a gasification furnace, and the gasified gasified fuel is dust-removed by a dust filter and then desulfurized by a desulfurization device and sent to a gas turbine. Exhaust gas from a gas turbine is recovered by a waste heat recovery boiler and released to the atmosphere (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-7-247807
[Problems to be solved by the invention]
In recent years, environmental issues have tended to be emphasized, and at present, it has become necessary to remove nitrogen oxides (NOx) and sulfur oxides (SOx) in exhaust gas at higher levels.
[0005]
The present invention has been made in view of the above circumstances, and even in a coal gasification combined facility equipped with a gas turbine that burns fuel obtained by gasifying coal, it is also possible to use nitrogen oxides (NOx) and sulfur oxides (SOx). It is an object of the present invention to provide a coal gasification combined facility capable of making the state of dust and the like substantially the same as the exhaust gas of a combined facility provided with a gas turbine for burning fuel such as natural gas.
[0006]
[Means for Solving the Problems]
The coal gasification combined facility of the present invention for achieving the above object,
A coal gasifier for gasifying coal,
A gas turbine in which gas fuel gasified in the coal gasifier is burned,
An exhaust heat recovery boiler, which receives the exhaust gas of the gas turbine and recovers heat, and has a denitration means in the flue;
Exhaust gas taken out of the exhaust heat recovery boiler is sent, pulverized coal drying means for pulverizing coal and drying pulverized coal while sending it.
A bag filter for separating the pulverized coal dried by the pulverized coal drying means and supplying it to the coal gasifier,
Activated carbon processing means provided with an activated carbon fiber layer catalyst through which exhaust gas passing through the bag filter flows,
Combining means for combining the exhaust gas from the activated carbon processing means with the exhaust gas heat recovered by the waste heat recovery boiler.
[0007]
And in the coal gasification combined facility of claim 1,
The denitration means includes a first denitration catalyst layer and a second denitration catalyst layer provided from the upstream side, an ammonia decomposition catalyst layer provided between the first and second denitration catalyst layers, and an inlet of the first denitration catalyst layer. A coal gasification combined facility characterized in that it is an ammonia decomposition type denitration catalyst in which ammonia is added in an amount equal to or greater than the reaction amount of nitrogen oxides (NOx) in exhaust gas.
[0008]
The coal gasification combined facility of the present invention for achieving the above object,
A coal gasifier for gasifying coal,
A gas turbine in which gasified fuel gasified in the coal gasifier is burned,
An exhaust heat recovery boiler, which receives the exhaust gas of the gas turbine and recovers heat, and has a denitration means in the flue;
And an activated carbon treatment means provided with a catalyst for the activated carbon fiber layer into which the exhaust gas heat recovered by the exhaust heat recovery boiler is introduced.
[0009]
And in the coal gasification combined facility of claim 3,
The denitration means includes a first denitration catalyst layer and a second denitration catalyst layer provided from the upstream side, an ammonia decomposition catalyst layer provided between the first and second denitration catalyst layers, and an inlet of the first denitration catalyst layer. It is characterized in that it is an ammonia decomposition type denitration catalyst in which ammonia is added in an amount equal to or more than the reaction amount of nitrogen oxides (NOx) in the exhaust gas.
[0010]
Further, in the coal gasification combined facility according to claim 3 or 4,
Exhaust gas taken out from the middle of the heat recovery boiler is sent to pulverize coal and dry pulverized coal while pulverized coal means,
The pulverized coal dried by the pulverized coal means is separated and supplied to a coal gasification furnace, and a bag filter is provided for merging the passed exhaust gas with the exhaust gas of the exhaust heat recovery boiler.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a schematic system of a coal gasification combined facility according to a first embodiment of the present invention, and FIG. 2 shows a schematic configuration of activated carbon treatment means.
[0012]
As shown in FIG. 1, a coal gasifier 1 for gasifying pulverized coal is provided. The coal gasifier 1 is pulverized by a pulverized coal machine 2 as pulverized coal drying means and captured by a bag filter 3. The collected pulverized coal is supplied.
[0013]
The gas fuel (coal gas) G1 gasified in the coal gasifier 1 is collected by a dust filter 4 and then desulfurized by a desulfurizer 5. The collected and desulfurized coal gas G1 is sent to the gas turbine 6, where the coal gas G1 is burned with compressed air in a combustor (not shown) and driven by the combustion gas.
[0014]
Exhaust gas G2 from the gas turbine 6 is recovered in the exhaust heat recovery boiler 7, and is discharged from the chimney 12 to the atmosphere. The flue of the exhaust heat recovery boiler 7 is provided with a denitration catalyst 11 as denitration means.
[0015]
The denitration catalyst 11 includes, for example, a first denitration catalyst layer and a second denitration catalyst layer provided from the upstream side, an ammonia decomposition catalyst layer provided between the first denitration catalyst layer and the second denitration catalyst layer, and a first denitration catalyst. An ammonia-decomposition type denitration catalyst is added to the inlet of the bed in which ammonia is added in an amount equal to or more than the reaction amount of nitrogen oxides (NOx) in the exhaust gas. By applying the ammonia decomposition type denitration catalyst, it is possible to significantly reduce the amount of acidic ammonium sulfate generated by sulfur oxide (SOx) and residual ammonia in exhaust gas. For this reason, when gypsum is precipitated by supplying lime slurry to dilute sulfuric acid in a later process, gypsum quality can be improved.
[0016]
Exhaust gas G3 (for example, 300 ° C.) is taken out of the exhaust heat recovery boiler 7 and sent to the pulverized coal machine 2, where the pulverized coal is dried and sent to the bag filter 3. Exhaust gas G4 from the bag filter 3 is sent to an activated carbon treatment means 8 provided with an activated carbon fiber layer catalyst, and is subjected to dust removal and desulfurization by the activated carbon treatment means 8, and is supplied to a waste heat recovery boiler 7 by a blower 9 as a joining means. Combined with exhaust gas.
[0017]
The activated carbon processing means 8 will be described based on FIG.
[0018]
The activated carbon treatment means 8 has a desulfurization tower 16 provided with a catalyst layer 15 formed of an activated carbon fiber layer inside. Water for producing sulfuric acid is supplied to the catalyst layer 15 from a watering nozzle 17 on the upper side. . Water (industrial water) from a water tank 18 is supplied to the watering nozzle 17 via a pump 19. Exhaust gas from the bag filter 3 is supplied with cooling water to be saturated (for example, 50 ° C.), and is introduced into the desulfurization tower 16 from the inlet 20. The SOx is reacted and removed from the exhaust gas by passing the exhaust gas through the inside of the catalyst layer 15 in which water is sprayed from above. The exhaust gas that has passed through the catalyst layer 15 is discharged from the discharge port 21.
[0019]
On the surface of the activated carbon fiber layer of the catalyst layer 15, for example, a desulfurization reaction occurs by the following reaction. That is,
(1) Adsorption of sulfur dioxide SO ₂ on the activated carbon fiber layer of the catalyst tank 15.
(2) Oxidation to sulfur trioxide SO ₃ by the reaction between the adsorbed sulfur dioxide SO ₂ and oxygen O ₂ in the flue gas (can be supplied separately).
(3) Formation of sulfuric acid H ₂ SO ₄ by dissolving oxidized sulfur trioxide SO ₃ in water H ₂ O.
(4) Desorption of the generated sulfuric acid H ₂ SO _{4 from} the activated carbon fiber layer.
[0020]
The reaction formula at this time is as follows.
SO ₂ + 1 / 2O ₂ + H ₂ O → H ₂ SO ₄
[0021]
The sulfuric acid H ₂ SO ₄ removed by the reaction is used as it is, or a lime slurry is supplied to deposit gypsum.
[0022]
In the coal gasification combined facility described above, the activated carbon treatment means 8 provided with the catalyst layer 15 formed of the activated carbon fiber layer is installed downstream of the bag filter 3, so that the dust and sulfur oxides ( SOx) can be removed. For this reason, dust and sulfur oxides (SOx) in the exhaust gas from the bag filter 3 are reduced, and the environmental performance is improved. Further, even when the bag filter 3 is damaged, the rise of dust and sulfur oxides (SOx) at the entrance of the chimney 12 is small, so that the plant can be continuously operated and the reliability is improved.
[0023]
By installing the activated carbon treatment means 8 downstream of the bag filter 3, the ratio of the exhaust gas G3 sent to the pulverized coal machine 2 to the gas amount at the inlet of the exhaust heat recovery boiler 7 (for example, 10%) is provided. It is possible to reduce dust and sulfur oxides (SOx).
[0024]
Assuming that the dust concentration at the outlet of the bag filter 3 is, for example, normally 10 mg / Nm ³ degrees, the dust concentration when the bag filter 3 is damaged increases from several tens to several hundreds mg / Nm ³ degrees, The dust concentration at the inlet of the chimney 12 (the limit value is, for example, 20 mg / Nm ³ ) increases, and the operation cannot be continued. By installing the activated carbon treatment means 8, for example, about 98% of the dust is removed, and the dust concentration at the inlet of the chimney 12 does not substantially increase, and the operation of the plant can be continued.
[0025]
In addition, since the moisture in the coal is evaporated in the pulverized coal machine 2, the outlet of the pulverized coal machine 2 has a low temperature (for example, 80 ° C.), and the flow rate of the cooling water supplied to the exhaust gas entering the activated carbon treatment means 8 is reduced. be able to.
[0026]
A second embodiment of the present invention will be described with reference to FIG.
[0027]
FIG. 3 shows a schematic system of a coal gasification combined facility according to a second embodiment of the present invention. The same members as those shown in FIG. 1 are denoted by the same reference numerals.
[0028]
As shown in FIG. 3, a coal gasifier 1 for gasifying pulverized coal is provided. The coal gasifier 1 is pulverized by a pulverizer 2 as pulverized coal means and collected by a bag filter 3. The supplied pulverized coal is supplied.
[0029]
The gasified fuel (coal gas) G1 gasified in the coal gasifier 1 is collected by a dust filter 4 and then desulfurized by a desulfurizer 5. The collected and desulfurized coal gas G1 is sent to the gas turbine 6, where the coal gas G1 is burned with compressed air in a combustor (not shown) and driven by the combustion gas.
[0030]
Exhaust gas G2 from the gas turbine 6 is recovered by an exhaust heat recovery boiler 7, and the flue of the exhaust heat recovery boiler 7 is provided with a denitration catalyst 25 as denitration means.
[0031]
The exhaust gas having recovered heat in the exhaust heat recovery boiler 7 is subjected to heat exchange in a gas gas heater 31 and sent to an activated carbon processing means 32. The activated carbon processing means 32 has basically the same configuration as the activated carbon processing means 8 shown in FIG.
[0032]
Exhaust gas is supplied to the pulverized coal machine 2 from the middle of the exhaust heat recovery boiler 7, and the exhaust gas from the bag filter 3 is joined to the upstream side of the gas gas heater 31.
[0033]
That is, the activated carbon treatment means 32 has a desulfurization tower 34 provided with a catalyst layer 33 formed of an activated carbon fiber layer inside, and water for sulfuric acid generation is supplied to the catalyst layer 33 from an upper watering nozzle 35. Is done. Water (industrial water) from a water tank 36 is supplied to the watering nozzle 35 via a pump 37.
[0034]
The exhaust gas that has undergone heat exchange in the gas gas heater 31 is supplied with cooling water and introduced into the desulfurization tower 34 from the inlet 38. SOx is reacted and removed from the exhaust gas by passing the exhaust gas through the inside of the catalyst layer 33 in which water is sprayed from above. The exhaust gas that has passed through the catalyst layer 33 is discharged from the outlet 21, exchanges heat with the gas gas heater 31, and is discharged from the chimney 12 to the atmosphere.
[0035]
On the surface of the activated carbon fiber layer of the catalyst layer 33, a desulfurization reaction occurs as described above.
That is,
SO ₂ + 1 / 2O ₂ + H ₂ O → H ₂ SO ₄
SOx is reacted and removed by the above reaction, and the sulfuric acid H ₂ SO ₄ removed by the reaction is used as it is, or a lime slurry is supplied to precipitate gypsum.
[0036]
In the above-mentioned coal gasification combined facility, since the activated carbon processing means 32 provided with the catalyst layer 33 formed of the activated carbon fiber activated carbon fiber layer is installed downstream of the exhaust heat recovery boiler 7, it is released to the atmosphere. It is possible to reduce dust and sulfur oxides (SOx) in exhaust gas, so that the levels of dust and sulfur oxides (SOx) are, for example, approximately the same as when natural gas fuel was burned be able to.
[0037]
A third embodiment of the present invention will be described with reference to FIGS.
[0038]
4 shows a schematic system of a coal gasification combined facility according to a third embodiment of the present invention, FIG. 5 shows a schematic configuration of an ammonia decomposition type denitration catalyst, and FIG. 6 shows characteristics of the ammonia decomposition type denitration catalyst. is there. The same members as those shown in FIG. 3 are denoted by the same reference numerals, and overlapping description is omitted.
[0039]
As shown in FIG. 4, the coal gasification combined facility according to the third embodiment is different from the coal gasification combined facility shown in FIG. A catalyst 41 is provided.
[0040]
As shown in FIG. 5, the ammonia decomposition type denitration catalyst 41 is provided with a first denitration catalyst layer 42 and a second denitration catalyst layer 43 from the upstream side, and the first denitration catalyst layer 42 and the second denitration catalyst layer 43 An ammonia decomposition catalyst layer 44 is provided therebetween. Ammonia (NH3) is added to the inlet of the first denitration catalyst layer 42 at a rate higher than the reaction amount of nitrogen oxides (NOx) in the exhaust gas.
[0041]
That is, the first denitration catalyst layer 42 is added with ammonia (NH ₃ ) in an amount equal to or more than the reaction amount of nitrogen oxide (NOx), and the first denitration catalyst layer 42 is denitrated by 90% or more. The unreacted NH ₃ flowing out of the catalyst layer 42 is decomposed by the ammonia decomposition catalyst layer 44 to adjust the concentration of NOx and NH ₃ at the inlet of the downstream second denitration catalyst layer 43. (NOx) and ammonia (NH ₃₎ to levels below 1 ppm.
[0042]
As shown in FIG. 6, when the ratio (molar ratio) of NH ₃ to NOx contained in the exhaust gas is higher than 1, the concentration of NOx at the outlet side is reduced as indicated by the line marked with ● in the figure. Thus, the concentration of NH3 on the outlet side can be made substantially zero, as indicated by the line marked with a triangle in the figure. Therefore, by the first denitration catalyst layer 42 is added nitrogen oxide reaction equivalent or more of ammonia (NOx) (NH _3), it can be seen that NOx, is NH ₃ becomes low level (1 ppm or less).
[0043]
The ammonia decomposition type denitration catalyst 41 NOx, the NH ₃ gas, which is at a low level, the cooling water is introduced into the desulfurization tower 34 from the inlet 38 is supplied. SOx is reacted and removed from the exhaust gas by passing the exhaust gas through the inside of the catalyst layer 33 in which water is sprayed from above. The exhaust gas that has passed through the catalyst layer 33 is discharged from the outlet 21, exchanges heat with the gas gas heater 31, and is discharged from the chimney 12 to the atmosphere.
[0044]
On the surface of the activated carbon fiber layer of the catalyst layer 33, a desulfurization reaction occurs as described above.
That is,
SO ₂ + 1 / 2O ₂ + H ₂ O → H ₂ SO ₄
SOx is reacted and removed by the above reaction, and the sulfuric acid H ₂ SO ₄ removed by the reaction is used as it is, or a lime slurry is supplied to precipitate gypsum.
[0045]
Coal gasification combined equipment described above, the exhaust heat recovery boiler 7 NOx, the provided ammonia decomposing type denitration catalyst 41 to the NH ₃ in the low level, with activated carbon繊活carbon fiber layer on the downstream of the exhaust heat recovery boiler 7 Since the activated carbon treatment means 32 provided with the formed catalyst layer 33 is installed, the sulfur oxides (SOx) in the exhaust gas and the acidic ammonium produced by the residual ammonia are greatly reduced and released to the atmosphere. It is possible to reduce dust and sulfur oxides (SOx) in exhaust gas, so that the levels of dust and sulfur oxides (SOx) are, for example, approximately the same as when natural gas fuel was burned be able to.
[0046]
For this reason, when the gypsum is deposited by supplying the lime slurry to the dilute sulfuric acid removed by the reaction in a later process, it becomes possible to improve the gypsum quality.
[0047]
【The invention's effect】
The coal gasification combined facility of the present invention includes a coal gasifier for gasifying coal, a gas turbine in which gas fuel gasified in the coal gasifier is burned, and heat recovery by sending exhaust gas from the gas turbine. Exhaust heat recovery boiler provided with denitration means in flue gas, pulverized coal drying means for sending flue gas taken out from the middle of the exhaust heat recovery boiler to pulverize coal and dry pulverized coal, and drying with pulverized coal drying means A bag filter for separating separated pulverized coal and supplying it to a coal gasifier, an activated carbon treatment unit having an activated carbon fiber layer catalyst through which exhaust gas passing through the bag filter flows, and an exhaust gas from the activated carbon treatment unit And a merging means for merging with the exhaust gas heat recovered by the waste heat recovery boiler, so that dust and sulfur oxides (SOx) are removed by the activated carbon fiber layer of the exhaust gas passing through the bag filter. Possible to become. Therefore, dust and sulfur oxides (SOx) in the exhaust air of the bag filter are reduced, and the environmental performance is improved. Further, even when the bag filter is damaged, the rise in sulfur oxide (SOx) is small, so that the plant can be continuously operated, and the reliability is improved.
[0048]
Further, in the coal gasification combined facility of the present invention, in the coal gasification combined facility according to claim 1, the denitration means is provided with a first denitration catalyst layer and a second denitration catalyst layer from the upstream side, and the first denitration catalyst is provided. An ammonia decomposition type denitration catalyst in which an ammonia decomposition catalyst layer is provided between the catalyst layer and the second denitration catalyst layer and ammonia is added to the inlet of the first denitration catalyst layer in an amount not less than the reaction amount of nitrogen oxides (NOx) in the exhaust gas. Therefore, it is possible to significantly reduce the amount of ammonium ammonium sulfate generated by sulfur oxides (SOx) and residual ammonia in the exhaust gas.
[0049]
The coal gasification combined facility of the present invention includes a coal gasifier for gasifying coal, a gas turbine in which gas fuel gasified in the coal gasifier is burned, and heat recovery by sending exhaust gas from the gas turbine. The exhaust heat recovery boiler provided with denitration means in the flue and the activated carbon treatment means provided with the catalyst of the activated carbon fiber layer in which the exhaust gas heat recovered by the waste heat recovery boiler was introduced,
Dust and sulfur oxides (SOx) can be removed by the activated carbon fiber layer of the exhaust gas passing through the exhaust heat recovery boiler. For this reason, dust and sulfur oxides (SOx) of exhaust gas are reduced, and environmental performance is improved.
[0050]
Further, in the coal gasification combined facility of the present invention, in the coal gasification combined facility according to claim 3, the denitration means includes a first denitration catalyst layer and a second denitration catalyst layer from an upstream side, and the first denitration catalyst. An ammonia decomposition type denitration catalyst in which an ammonia decomposition catalyst layer is provided between the catalyst layer and the second denitration catalyst layer and ammonia is added to the inlet of the first denitration catalyst layer in an amount not less than the reaction amount of nitrogen oxides (NOx) in the exhaust gas. Therefore, it is possible to significantly reduce the amount of ammonium ammonium sulfate generated by sulfur oxides (SOx) and residual ammonia in the exhaust gas.
[Brief description of the drawings]
FIG. 1 is a schematic system diagram of a coal gasification combined facility according to a first embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of activated carbon processing means.
FIG. 3 is a schematic system diagram of a coal gasification combined facility according to a second embodiment of the present invention.
FIG. 4 is a schematic system diagram of a coal gasification combined facility according to a third embodiment of the present invention.
FIG. 5 is a schematic configuration diagram of an ammonia decomposition type denitration catalyst.
FIG. 6 is a graph showing characteristics of an ammonia decomposition type denitration catalyst.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coal gasifier 2 Pulverized coal machine 3 Bag filter 4 Dust collection filter 5 Desulfurizer 6 Gas turbine 7 Exhaust heat recovery boiler 8, 32 Active carbon treatment means 11 Denitration catalyst 12 Chimney 15, 33 Catalyst layer 16, 34 Desulfurization tower 17 , 35 Watering nozzle 18, 36 Water tank 19, 37 Pump 20, 38 Inlet 21 Outlet 25 Denitration catalyst 31 Gas gas heater 41 Ammonia decomposition type denitration catalyst 42 First denitration catalyst layer 43 Second denitration catalyst layer 44 Ammonia decomposition catalyst layer

Claims (5)

A coal gasifier for gasifying coal,
A gas turbine in which gas fuel gasified in the coal gasifier is burned,
Exhaust heat recovery boiler with exhaust gas from gas turbine sent and heat recovered and flue gas denitration means installed,
Exhaust gas taken out from the middle of the heat recovery boiler is sent, pulverized coal drying means for pulverizing coal and drying pulverized coal.
A bag filter for separating pulverized coal dried by pulverized coal drying means and supplying the separated coal to a coal gasifier;
Activated carbon processing means provided with an activated carbon fiber layer catalyst through which exhaust gas passing through the bag filter flows,
A coal gasification combined facility comprising: a merging means for merging exhaust gas from the activated carbon processing means with exhaust gas heat recovered by the waste heat recovery boiler. The coal gasification combined facility according to claim 1,
The denitration means includes a first denitration catalyst layer and a second denitration catalyst layer provided from an upstream side, an ammonia decomposition catalyst layer provided between the first denitration catalyst layer and the second denitration catalyst layer, and an inlet of the first denitration catalyst layer. A coal gasification combined facility, characterized in that it is an ammonia decomposition type denitration catalyst in which ammonia is added to the exhaust gas in an amount not less than the reaction amount of nitrogen oxides (NOx). A coal gasifier for gasifying coal,
A gas turbine in which gas fuel gasified in the coal gasifier is burned,
An exhaust heat recovery boiler, in which the exhaust gas of the gas turbine is sent to recover heat and has a denitration means in its flue;
A combined coal gasification facility comprising: an activated carbon treatment unit that receives exhaust gas recovered by heat recovery from an exhaust heat recovery boiler and includes an activated carbon fiber layer catalyst. The coal gasification combined facility according to claim 3,
The denitration means includes a first denitration catalyst layer and a second denitration catalyst layer provided from an upstream side, an ammonia decomposition catalyst layer provided between the first denitration catalyst layer and the second denitration catalyst layer, and an inlet of the first denitration catalyst layer. A coal gasification combined facility, characterized in that it is an ammonia decomposition type denitration catalyst in which ammonia is added to the exhaust gas in an amount not less than the reaction amount of nitrogen oxides (NOx). In the coal gasification combined facility according to claim 3 or 4,
Exhaust gas taken out of the exhaust heat recovery boiler is sent to pulverize coal while pulverizing coal and drying pulverized coal,
A coal gasification combined facility comprising: a bag filter for separating pulverized coal dried by pulverized coal means, supplying the separated pulverized coal to a coal gasifier, and merging passed exhaust gas with exhaust gas of an exhaust heat recovery boiler. .

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