JP2012233635A - Fluidized bed drying apparatus and gasification composite power generation system using coal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluidized bed drying apparatus capable of compactifying a system, and to provide a gasification composite power generation system using coal.SOLUTION: The fluidized bed drying apparatus includes: a drying chamber body 102 for drying low-grade coal 101; a dried coal discharge line Lfor discharging dried coal 101A from the drying chamber body 102; a fluidizing gas supply line Lfor supplying fluidizing gas 107 to a lower part of the drying chamber body 102 to thus form a fluidized bed 111 together with the low-grade coal; a gas discharge line Lfor discharging therethrough fluidizing gas and generated steam 104 discharged from the drying chamber body; a heating means 103 for heating the low-grade coal 101 supplied into the fluidized bed 111; an electric dust collector 120 provided in a free board F in the drying chamber body 102 and removing fine powder contained in the fluidizing gas and generated steam 104; and a collection means 122 for recovering fine powder separated and removed by the electric dust collector 120 into the fluidized bed.

Description

  The present invention relates to a fluidized bed drying apparatus applicable to a gasification system for gasifying coal and a gasification combined power generation system using coal.

  For example, a combined coal gasification power generation facility is a power generation facility that aims to further increase the efficiency and environmental performance compared to conventional coal-fired power generation by gasifying coal and combining it with combined cycle power generation. This coal gasification combined cycle power generation facility has a great merit that it can use coal with abundant resources, and it is known that the merit can be further increased by expanding the applicable coal types.

  Conventional coal gasification combined power generation facilities generally have a coal supply device, a drying device, a coal gasification furnace, a gas purification device, a gas turbine facility, a steam turbine facility, an exhaust heat recovery boiler, a gas purification device, and the like. ing. Therefore, the coal is dried and then pulverized, supplied to the coal gasifier as pulverized coal, and air is taken in. The coal gas is combusted and gasified in this coal gasifier, and the product gas (combustible) Gas) is produced. Then, the product gas is purified and then supplied to the gas turbine equipment to burn and generate high-temperature and high-pressure combustion gas to drive the turbine. The exhaust gas after driving the turbine recovers thermal energy by the exhaust heat recovery boiler, generates steam and supplies it to the steam turbine equipment, and drives the turbine. As a result, power generation is performed. On the other hand, the exhaust gas from which the thermal energy has been recovered is released into the atmosphere through a chimney after harmful substances are removed by the gas purification device.

  By the way, the coal used in such a coal gasification combined cycle power generation system (IGCC) uses high-grade coal (high-grade coal) having a high calorific value such as bituminous coal and anthracite coal.

  The coal supplied to the combined coal gasification combined power generation system (IGCC) needs to be pulverized from the viewpoint of reactivity in the coal gasification furnace and air current conveyance, and a coal mill is used as a pulverized coal machine. . For this reason, the coal supplied as a raw material is first roughly pulverized by a crusher, then dried by a dryer, and then stored by a dry coal bunker. Subsequently, it is supplied to a coal mill by a coal supply machine, where it is pulverized and dried to be pulverized coal, and then transferred from a carrier gas and supplied to a coal gasifier (Patent Document 1).

JP 7-279621 A

  By the way, in the exhaust gas discharged from the drying device, fine coal is contained, and thus it is removed by a collecting means such as an electric dust collector. Etc., and the equipment must be transported to the downstream equipment, resulting in a problem that the equipment becomes excessive and the system becomes large.

  Therefore, the advent of a fluidized bed drying apparatus that can be supplied to a gasification system that gasifies coal with high efficiency and can be made compact in drying low-grade coal is eagerly desired.

  This invention makes it a subject to provide the gasification combined cycle power generation system using the fluidized-bed drying apparatus and coal which can achieve size reduction of a system in view of the said problem.

  The first invention of the present invention for solving the above-described problems includes a drying chamber main body for drying an object to be dried, a dried product discharge line for discharging the dried product from the drying chamber main body, and the drying chamber main body. A fluidized gas supply line that forms a fluidized bed together with low-quality coal by supplying a fluidized gas to the lower part of the gas, a gas discharge line that discharges the fluidized gas and generated steam discharged from the drying chamber body, and A heating means for heating an object to be dried supplied in a fluidized bed, an electric dust collector provided in a free board in the drying chamber body, for removing fine powder contained in fluidized gas and generated steam, and A fluidized bed drying apparatus comprising: a collecting means for collecting fine powder separated and removed by an electric dust collector into a fluidized bed.

  A second invention is the fluidized bed drying apparatus according to the first invention, wherein a gas hole is provided in the recovery means and a part of the fluidizing gas is supplied.

  According to a third aspect of the present invention, there is provided the first or second fluidized bed drying device, a coal gasification furnace that processes the dry coal supplied from the fluidized bed drying device and converts it into gasified gas, and the gasified gas as fuel. A gas turbine (GT) operated as a steam turbine (ST) operated by steam generated by a heat recovery steam generator that introduces turbine exhaust gas from the gas turbine, the gas turbine and / or the steam turbine, A combined gasification combined power generation system using coal, characterized in that it includes a generator (G) connected thereto.

  According to the fluidized bed drying apparatus of the present invention, by installing the electrostatic precipitator in the drying chamber main body, as compared with the case where the electrostatic precipitator is separately provided outside as in the prior art, the heating of the pipe is performed.・ Heat insulation is not required, and there is no need for equipment for transporting recovered coal from the electrostatic precipitator, making the system more compact.

FIG. 1 is a schematic diagram of a fluidized bed drying apparatus according to the first embodiment. FIG. 2 is a plan view of the fluidized bed drying apparatus according to the first embodiment. FIG. 3 is a schematic configuration diagram of a gasification combined power generation system using coal according to the second embodiment.

  Exemplary embodiments of a fluidized bed drying apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

FIG. 1 is a schematic diagram of a fluidized bed drying apparatus according to the first embodiment. FIG. 2 is a plan view of the fluidized bed drying apparatus according to the first embodiment.
As shown in FIGS. 1 and 2, a fluidized bed drying apparatus 100 according to this embodiment includes a drying chamber body 102 that dries low-grade coal 101 that is an object to be dried, and a dried material that is dried from the drying chamber body 102. The dry coal discharge line L ₁ for discharging the dry coal 101A and the fluidized gas supply line L ₂ for forming the fluidized bed 111 together with the low quality coal by supplying the fluidized gas 107 to the lower part of the drying chamber main body 102. A gas discharge line L ₃ for discharging the fluidized gas and generated steam 104 discharged from the drying chamber main body, and a heat transfer member which is a heating means for heating the low-grade coal 101 supplied into the fluidized bed 111 103, an electrostatic precipitator 120 provided in a free board F in the drying chamber main body 102 and removing fine powder contained in fluidized gas and generated steam 104, and separated by the electrostatic precipitator 120 The removed by fines are those comprising a recovery means 122 for recovering the fluidized bed. Reference numeral 116 illustrates a current plate.
In this embodiment, the raw low-grade coal 101 is pulverized in advance by a pulverizer (not shown).

  In the drying chamber main body 102, it is fluidized by the fluidized vapor 107 introduced to form a fluidized bed 111.

  The heat transfer member 103 is disposed in the fluidized bed 111. For example, 150 ° C. drying steam (superheated steam) A is supplied into the heat transfer member 103, and the low-grade coal 101 is indirectly dried using the latent heat of the high-temperature drying steam (superheated steam) A. I try to let them. The drying steam (superheated steam) A used for drying is discharged to the outside of the drying chamber main body 102 as, for example, 150 ° C. condensed water B.

  That is, since the drying steam (superheated steam) A condenses into liquid (moisture) on the inner surface of the heat transfer member 103 as a heating means, the condensation latent heat radiated at this time is used to dry the low-grade coal 101. It is effectively used for heating. In addition to the high-temperature drying steam (superheated steam) A, any heating medium that accompanies phase change may be used, and examples thereof include Freon, pentane, and ammonia. Moreover, you may install an electric heater other than using a heat medium as a heat-transfer member.

In addition, although the present Example has illustrated the tube-shaped heat transfer member as the heat transfer member 103 mentioned above, this invention is not limited to this, For example, you may make it use a plate-shaped heat transfer member. .
Moreover, although the structure which supplies the steam (superheated steam) A for drying to the heat-transfer member 103 and dries the low grade coal 101 indirectly was demonstrated, it does not restrict to this but the fluidized bed 111 of the low grade coal 101 flows. Alternatively, the low-grade coal 101 may be directly dried by the fluidized steam 107 to be dried, or the heating fluidized gas may be supplied and dried.

In the present embodiment, the electrostatic precipitator 120 is further installed in the free board F of the drying chamber main body 102. By installing this electric dust collector 120 inside, the fine powder 101a contained in the fluidized gas and the generated steam 104 is collected. The electrostatic precipitator 120 is electrically insulated from the drying chamber body.
The electric dust collector 120 according to the present embodiment includes three dust collection chambers 120A to 120C, and electrodes 121A to 121C are provided in the dust collection chambers 120A to 120C.

  An inlet (not shown) for introducing fluidized gas and generated steam 104 is provided on the side surfaces of the dust collection chambers 120A to 120C, and fine powder is collected in each of the dust collection chambers 120A to 120C.

  And the dry charcoal (fine powder) 101a collect | recovered with the electric dust collector 120 is paid out on the collection | recovery means 122 from the lower part of each dust collection chamber 120A-120C. Then, a part 107a of the flowing gas is formed in the recovery means 122 and introduced from the gas hole 122a, and while flowing on the upper surface of the recovery means 122, the dry charcoal (fine powder) 101a is returned to the inlet X side to flow. It is dropped into the layer 111 and circulated.

  As shown in FIG. 2, the recovery means 122 is provided only on the lower side of the electrostatic precipitator 120, and only in a part above the fluidized bed 111, in this embodiment, the side wall in the longitudinal direction of the drying chamber main body 102. Along the line, the outlet side (Y) of the dry coal 101A is inclined to the inlet side (X) of the low-grade coal 101.

  By installing the electrostatic precipitator 120 in the drying chamber main body 102 as in the present embodiment, the heating and heat insulation of the pipe is compared to the case where the electrostatic precipitator is separately provided outside as in the prior art. Is not necessary, and a facility for transporting recovered coal from the electrostatic precipitator is not required. Thereby, the fluidized-bed drying apparatus which can achieve size reduction of a system can be provided.

  Moreover, since the generated steam 104 after being collected by the dust collector 120 is, for example, steam at 105 to 110 ° C., the heat is recovered by a latent heat recovery system (not shown). Note that the generated steam 104 after being collected by the dust collector 105 may be applied to, for example, a heat exchanger, a steam turbine, or the like to effectively use the heat.

In addition, some of the steam generated 104 after being dust collecting by the dust collector 125 (※ 1) is sent to the drying chamber body 102 by a fluidizing gas supply line L ₂ for example the circulation fan 114 interposed Thus, it is used as fluidized steam 107 that causes the fluidized bed 111 of the low-grade coal 101 to flow. In this embodiment, as the fluidizing medium for fluidizing the fluidized bed 111, a part of the generated steam 104 is reused. However, the present invention is not limited to this. For example, nitrogen, carbon dioxide, or these gases may be used. You may use the air of the low oxygen concentration which contains.

  FIG. 3 is a schematic configuration diagram of a gasification combined power generation system using coal according to the second embodiment.

  The gasification combined power generation system (IGCC: Integrated Coal Gasification Combined Cycle) using the coal of Example 2 adopts an air combustion system that generates coal gas in a coal gasification furnace using air as an oxidizer, and is a gas purification device. The refined coal gas is supplied as fuel gas to the gas turbine equipment for power generation. That is, the combined coal gasification combined power generation facility of this embodiment is a power generation facility of an air combustion system (air blowing). In this embodiment, low-grade coal is used as a coal raw material supplied to the coal gasifier 14.

  In Example 2, as shown in FIG. 3, the coal gasification combined power generation facility 10 includes a low-grade coal supply facility 11 that supplies coal 101 that is raw coal, and a fluidized-bed drying apparatus 100 that dries the low-grade coal 101. A coal gasification furnace 14 that gasifies and generates combustible gas (product gas, coal gas) 200 by supplying dry low-grade coal (dry coal) 101A, and combustible gas (product gas, gasification gas) Char gas recovery device 15 for recovering char 101C in coal gas) 200, gas purification device 16 for purifying combustible gas (product gas, coal gas) 200A, and combustion of purified fuel gas 200B to drive the turbine Gas turbine equipment 17 and a heat recovery steam generator for introducing turbine exhaust gas from the gas turbine equipment 17 (Heat Recovery Steam Generator) A steam turbine (ST) facility 18, which is operated by the generated steam in HRSG) 20, which comprises a said gas turbine equipment 17 and / or the steam turbine plant 18 and linked generator (G) 19.

  The low-grade coal supply facility 11 according to the present embodiment includes a raw coal bunker 21, a coal supply machine 22, and a pulverizer 23. The raw coal bunker 21 can store the low-grade coal 101, and can drop a predetermined amount of the low-grade coal 101 into the coal feeder 22. The coal feeder 22 can transport the low-grade coal 101 dropped from the raw coal bunker 21 by, for example, a conveyor and drop it on the crusher 23. The crusher 23 can crush the dropped low-grade coal 101 into a predetermined size to obtain the pulverized coal 101.

  The fluidized bed drying apparatus 100 uses the apparatus of Example 1 or 2 to supply drying steam (for example, superheated steam at about 150 ° C.) A to the low-grade coal 101 introduced by the low-grade coal supply facility 11. Thus, the low-grade coal 101 is heated and dried while flowing, and the moisture contained in the low-grade coal 101 can be removed. The fluidized bed drying apparatus 100 is provided with a cooler 31 for cooling the dried dry coal 101A taken out to the outside, and the dried and cooled dry coal 101A is stored in the dry coal bunker 34. Further, the drying chamber main body 102 is provided with a dust collector 105 such as a dry coal cyclone for separating dry coal particles accompanying the generated steam 104 taken out from the upper portion, and fine dry coal particles are generated from the generated steam 104. Are separated. Note that the steam from which the dry coal is separated by the dust collector 105 such as a cyclone may be supplied as drying steam to the drying chamber main body 102 after being compressed by the steam compressor.

  The dried and cooled dry charcoal 101A that has been dried in the drying chamber main body 102 and then cooled in the cooler 31 is temporarily dried through the fine dry charcoal discharge line 123 and then through the bag filter 32 and the bottle system 33. It is stored in the charcoal bunker 34.

  The coal gasification furnace 14 can supply the dry coal 101A supplied from the dry coal bunker 34, and the char (unburned coal) 101C recovered by the char recovery device 15 is returned to be recycled. ing.

That is, the coal gasification furnace 14 is connected to the compressed air supply line 41 from the gas turbine equipment 17 (compressor 61), and can supply compressed air compressed by the gas turbine equipment 17. The air separation device 42 separates and generates nitrogen (N ₂ ) and oxygen (O ₂ ) from the air 40 in the atmosphere. The first nitrogen supply line 43 is connected to the coal gasifier 14, and the first The nitrogen supply line 43 is connected to the dry coal supply line 123. The second nitrogen supply line 45 is also connected to the coal gasification furnace 14, and a char return line 46 for returning the char 101 C recovered from the char recovery device 15 is connected to the second nitrogen supply line 45. Further, the oxygen supply line 47 is connected to the compressed air supply line 41. In this case, nitrogen (N ₂ ) is used as a transfer gas for dry charcoal 101A and char 101C, and oxygen (O ₂ ) is used as an oxidizing agent.

The coal gasification furnace 14 is, for example, a spouted bed type gasification furnace, and combusts and gasifies dry coal 101A, char 101C, air (oxygen) supplied therein, or water vapor as a gasifying agent. At the same time, a combustible gas (generated gas, coal gas) 200 containing carbon monoxide as a main component is generated, and a gasification reaction is generated using the combustible gas 200 as a gasifying agent. The coal gasification furnace 14 is provided with a foreign matter removing device 48 for removing foreign matters such as molten slag mixed with pulverized coal.
In this example, a spouted bed gasification furnace is illustrated as the coal gasification furnace 14, but the present invention is not limited to this, and may be, for example, a fluidized bed gasification furnace or a fixed bed gasification furnace. The coal gasification furnace 14 is provided with a gas generation line 49 of the combustible gas 200 toward the char recovery device 15, and the combustible gas 200 including the char 101C can be discharged. In this case, a gas cooler is separately provided in the gas generation line 49 so that the combustible gas 200 is cooled to a predetermined temperature and then supplied to the char recovery device 15.

  The char recovery device 15 includes a dust collector 51 and a char supply hopper 52. In this case, the dust collector 51 is constituted by one or a plurality of bag filters or cyclones, and can separate the char 101C contained in the combustible gas 200 generated in the coal gasification furnace 14. The combustible gas 200 </ b> A from which the char 101 </ b> C has been separated is sent to the gas purification device 16 through the gas discharge line 53. The char supply hopper 52 stores the char 101 </ b> C separated from the combustible gas 200 by the dust collector 51. A bin may be disposed between the dust collector 51 and the supply hopper 52, and a plurality of char supply hoppers 52 may be connected to the bin. A char return line 46 from the supply hopper 52 is connected to the second nitrogen supply line 45.

The gas purification device 16 performs gas purification by removing impurities such as sulfur compounds and nitrogen compounds from the combustible gas 200A from which the char 101C has been separated by the char recovery device 15. Then, the gas purifier 16 purifies the combustible gas 200A from which the char 101C is separated to produce the fuel gas 200B, and supplies this to the gas turbine equipment 17. In this gas purification device 16, since the combustible gas 200A from which the char 101C has been separated still contains a sulfur content (H ₂ S), the sulfur content is removed by, for example, an amine absorbing solution. Is finally collected as gypsum and used effectively.

  The gas turbine equipment 17 includes a compressor 61, a combustor 62, and a turbine 63, and the compressor 61 and the turbine 63 are connected by a rotating shaft 64. The combustor 62 has a compressed air supply line 65 connected to the compressor 61, a fuel gas supply line 66 connected to the gas purifier 16, and a combustion gas supply line 67 connected to the turbine 63. Further, the gas turbine equipment 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the coal gasification furnace 14, and a booster 68 is provided in the middle. Therefore, in the combustor 62, the compressed air 40 </ b> A supplied from the compressor 61 and the fuel gas 200 </ b> B supplied from the gas purification device 16 are mixed and burned, and the rotating shaft is generated by the generated combustion gas 202 in the turbine 63. The generator 19 can be driven by rotating 64.

  The steam turbine facility 18 includes a turbine 69 that is coupled to the rotating shaft 64 in the gas turbine facility 17, and the generator 19 is coupled to the base end portion of the rotating shaft 64. The exhaust heat recovery boiler 20 is provided in the exhaust gas line 70 from the gas turbine equipment 17 (the turbine 63), and generates steam 204 by exchanging heat between the air 40 and the high temperature exhaust gas 203. It is. Therefore, the exhaust heat recovery boiler 20 is provided with a steam supply line 71 for supplying the steam 204 to and from the turbine 69 of the steam turbine equipment 18, a steam recovery line 72 is provided, and the steam recovery line 72 has a condenser. 73 is provided. Therefore, in the steam turbine equipment 18, the turbine 69 is driven by the steam 204 supplied from the exhaust heat recovery boiler 20, and the generator 19 can be driven by rotating the rotating shaft 64.

  The exhaust gas 205 whose heat has been recovered by the exhaust heat recovery boiler 20 is freed of harmful substances by the gas purification device 74, and the purified exhaust gas 205A is released from the chimney 75 to the atmosphere.

  Here, the action | operation of the coal gasification combined cycle power generation equipment 10 of Example 2 is demonstrated.

  In the combined coal gasification combined power generation facility 10 of the second embodiment, the low-grade coal 101 that is raw coal is stored in the raw coal bunker 21 in the low-grade coal supply facility 11, and the low-grade coal of the raw coal bunker 21 is stored. 101 is dropped into the pulverizer 23 by the coal feeder 22 and crushed into a predetermined size. The crushed pulverized coal 101 is heated and dried by the fluidized bed drying apparatus 100, and after the dry coal 101A is extracted through the fine particle dry coal discharge line 123, it is cooled by the cooler 31 and cooled. The dry coal 101A is stored in the dry coal bunker 34.

  The fine dry coal 101A stored in the dry coal bunker 34 is supplied to the coal gasifier 14 through the dry coal discharge line 123 by nitrogen supplied from the air separator 42. Further, the char 101C recovered by the char recovery device 15 to be described later is supplied to the coal gasification furnace 14 through the char return line 46 by nitrogen supplied from the air separation device 42. Further, compressed air 37 extracted from a gas turbine facility 17 to be described later is pressurized by a booster 68 and then supplied to the coal gasifier 14 through the compressed air supply line 41 together with oxygen supplied from the air separation device 42. .

  In the coal gasification furnace 14, the supplied dry charcoal 101A and char 101C are combusted by compressed air (oxygen) 37, and the dry charcoal 101A and char 101C are gasified, so that combustibility is mainly composed of carbon monoxide. A gas (coal gas) 200 can be generated. The combustible gas 200 is discharged from the coal gasifier 14 through the gas generation line 49 and sent to the char recovery device 15.

  In the char recovery device 15, the combustible gas 200 is first supplied to the dust collector 51, whereby the char 101 </ b> C contained in the combustible gas 200 is separated here. The combustible gas 200 </ b> A from which the char 101 </ b> C has been separated is sent to the gas purification device 16 through the gas discharge line 53. On the other hand, the fine char 101C separated from the combustible gas 200 is deposited on the char supply hopper 52, returned to the coal gasifier 14 through the char return line 46, and recycled.

  The combustible gas 200A from which the char 101C has been separated by the char recovery device 15 is gas purified by removing impurities such as sulfur compounds and nitrogen compounds in the gas purification device 16 to produce a fuel gas 200B. In the gas turbine equipment 17, when the compressor 61 generates the compressed air 40 </ b> A and supplies it to the combustor 62, the combustor 62 is supplied from the compressed air 40 </ b> A supplied from the compressor 61 and the gas purification device 16. The fuel gas 200B is mixed and burned to generate a combustion gas 202. By driving the turbine 63 with the combustion gas 202, the generator 19 is driven via the rotating shaft 64 to generate power. be able to.

  The exhaust gas 203 discharged from the turbine 63 in the gas turbine equipment 17 generates heat 204 by exchanging heat with the air 40 in the exhaust heat recovery boiler 20, and the generated steam 204 is used as the steam turbine equipment 18. To supply. In the steam turbine facility 18, the turbine 69 is driven by the steam 204 supplied from the exhaust heat recovery boiler 20, whereby the generator 19 can be driven via the rotating shaft 64 to generate power.

  Thereafter, in the gas purification device 74, harmful substances in the exhaust gas 205 discharged from the exhaust heat recovery boiler 20 are removed, and the purified exhaust gas 205A is released from the chimney 75 to the atmosphere.

  In this example, low-grade coal was used as a coal raw material, but even high-grade coal can be applied, and is not limited to coal, and can be used as a renewable bio-derived organic resource. Biomass may be used, and for example, thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets and chips) using these as raw materials can be used.

DESCRIPTION OF SYMBOLS 10 Coal gasification combined cycle power generation equipment 11 Low grade coal supply equipment 14 Coal gasification furnace 15 Char recovery device 16 Gas refinement device 17 Gas turbine equipment 18 Steam turbine equipment 19 Generator 20 Waste heat recovery boiler 31 Cooler 100 Fluidized bed drying device 101 Low-grade coal 101A Dry low-grade coal (dry coal)
101a Fine powder 102 Drying chamber body 103 Heat transfer member (heating means)
104 Generated steam 120 Electric dust collector 121A-C Electrode 122 Recovery means A Drying steam (superheated steam)
B Condensate

Claims (3)

A drying chamber body for drying an object to be dried;
A dry matter discharge line for discharging dry matter from the drying chamber body;
A fluidized gas supply line that forms a fluidized bed with low-quality coal by supplying fluidized gas to the lower part of the drying chamber body;
A gas discharge line for discharging fluidized gas and generated steam discharged from the drying chamber body;
Heating means for heating the material to be dried supplied into the fluidized bed;
An electrostatic precipitator that is provided in a freeboard in the drying chamber body and removes fine powder contained in fluidized gas and generated steam;
A fluidized bed drying apparatus comprising: a collecting unit that collects the fine powder separated and removed by the electric dust collector into a fluidized bed. In claim 1,
A fluidized bed drying apparatus characterized in that a gas hole is provided in the recovery means and a part of fluidized gas is supplied. The fluidized bed drying apparatus according to claim 1 or 2,
A coal gasification furnace that processes the dry coal supplied from the fluidized bed drying device and converts it into gasification gas;
A gas turbine (GT) operated using the gasified gas as fuel;
A steam turbine (ST) operated by steam generated by an exhaust heat recovery boiler for introducing turbine exhaust gas from the gas turbine;
A gasification combined power generation system using coal, comprising the generator (G) connected to the gas turbine and / or the steam turbine.

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