WO2012147752A1

WO2012147752A1 - Fluidized bed drying apparatus and integrated coal gasification combined cycle system

Info

Publication number: WO2012147752A1
Application number: PCT/JP2012/060994
Authority: WO
Inventors: 澤津橋　徹哉; 功鳥居; 竜平高島; 啓二山崎
Original assignee: 三菱重工業株式会社
Priority date: 2011-04-28
Filing date: 2012-04-24
Publication date: 2012-11-01
Also published as: AU2012248415A1; AU2012248415B2; JP2012233073A

Abstract

This system is provided with: a fluidized bed drying device (102) in which fluidized gas (107) is fed to a drying chamber to thereby fluidize and dry low-grade coal fed to the drying chamber; a raw-coal fluidized bed bunker (50) for temporarily fluidizing and retaining low-grade raw coal (101), the raw-coal fluidized bed bunker being disposed on the upstream side of the fluidized bed drying device (102); a raw-coal particulates removal line L₁₁ for removing raw-coal particulates (101A) from the upper side of the raw-coal fluidized bed bunker (50); a raw-coal coarse particles removal line L₁₂ for removing raw-coal coarse particles (101B) from the lower side of the raw-coal fluidized bed bunker (50); a pulverizer (56) for pulverizing the raw-coal coarse particles (101B); and a pulverized coal fed line L₁ for feeding pulverized coarse coal (101C) to the drying chamber.

Description

Gasification combined cycle system using fluidized bed drying equipment and coal

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

For example, the combined coal gasification combined power generation facility is a power generation facility aiming at higher efficiency and higher environmental performance than conventional coal-fired power 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).

By the way, when drying by the extrusion type (plug flow type) with steam fluidized bed drying, the moisture load at the inlet portion becomes the highest, and moisture condenses on the surface of the coal, resulting in poor flow. is there.
Conventionally, as an apparatus for drying coal, the supply amount of fluidized gas at the inlet is adjusted so that coal that is to be dried does not flow poorly (Patent Document 2).

Japanese Patent Laid-Open No. 7-279621 JP-A-6-299176

However, since the moisture concentration of coal is high at the inlet, there is a problem that the amount of fluidized gas becomes excessive, increasing the equipment and running costs.
As a countermeasure, a method of reducing the moisture load at the inlet by circulating dry charcoal at the inlet is proposed, but there is a problem that ancillary equipment (for example, a conveyor, a hopper, etc.) for circulation becomes large. .

Moreover, there exists a foreign material, such as earth and sand contained in coal, and there exists a problem that the trouble of a crusher and a drying apparatus generate | occur | produces.
Furthermore, regarding the crushing of the raw coal, there is a problem that fine particles are contained in the raw coal, and if all the raw coal is crushed with a crusher, useless power is consumed.

Therefore, the advent of a fluidized bed drying facility that can be supplied to a gasification system that gasifies coal with high efficiency and can reduce costs when drying low-grade coal is eagerly desired.

In view of the above problems, an object of the present invention is to provide a fluidized bed drying facility capable of reducing a drying cost and a gasification combined power generation system using coal.

The first invention of the present invention for solving the above-mentioned problems is a fluidized bed drying apparatus for flowing and drying low-grade coal supplied to a drying chamber by supplying a fluidizing gas to the drying chamber; A raw coal fluidized bed bunker that is provided on the upstream side of the bed dryer and stores low-quality coking coal while temporarily flowing, and raw coal fines extracted from the upper side of the raw coal fluidized bed bunker A fine particle extraction line, a raw coal coarse particle extraction line for extracting raw coal coarse particles from the lower side of the raw coal fluidized bed bunker, a pulverizer for pulverizing the raw coal coarse particles, and the pulverized pulverized coal in a drying chamber A fluidized bed drying facility comprising a pulverized coal supply line to be supplied.

According to a second invention, in the first invention, a partition wall is formed in a fluidized bed of the raw coal fluidized bed bunker, and a raw coal fine particle extraction line for discharging raw coal fine particles extracted from the partition wall is provided. It is in the fluidized bed drying facility characterized by this.

According to a third aspect of the present invention, there is provided a first or second fluidized bed drying facility, a coal gasification furnace that converts dry coal supplied from the fluidized bed drying apparatus into gasified gas, and fuels the gasified gas. 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 facility of the present invention, a part of the dry coal is extracted and supplied to the wet low-grade coal again, thereby reducing the moisture load at the low-grade coal charging portion.

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

Hereinafter, preferred embodiments of a fluidized bed drying facility according to the present invention will be described 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 facility according to the first embodiment.
As shown in FIG. 1, the fluidized bed drying facility 100 A according to the present embodiment is a flow in which low-grade coal supplied to the drying chamber is flowed and dried by supplying fluidized gas (steam) 107 to the drying chamber. A bed drying device 102, a raw coal fluidized bed bunker 50 provided on the upstream side of the fluidized bed drying device 102 and storing the low-grade raw coal 101 while temporarily flowing, and the raw coal fluidized bed bunker 50 The raw coal fine particle extraction line L ₁₁ for extracting the raw coal fine particles 101A from the upper side, the raw coal coarse particle extraction line L ₁₂ for extracting the raw coal coarse particles 101B from the lower side of the raw coal fluidized bed bunker 50, and the raw material A pulverizer 56 for pulverizing the coarse coal particles 101B and a pulverized coal supply line L ₁ for supplying the pulverized pulverized coal 101C to the drying chamber are provided.

As shown in FIG. 1, the raw coal fluidized bed bunker 50 is provided on the upstream side of the fluidized bed drying apparatus 102, and preliminarily drys the raw coal (low-grade coal) 101 with the fluidized gas 52.
During this pre-drying, the raw coal fine 101A that is pre-dried is present in soar gas into the freeboard F, by the line L ₁₁ extracts the raw coal fine 101A raw coal fine, withdrawal, raw coal fine separating the exhaust gas 55 and the raw coal fine 101A by a cyclone 54 which is interposed in the line L ₁₁ withdrawal. The separated raw coal fine 101A is joined to the grinding coal supply line L ₁ for supplying crushed pulverized coal 101C with a pulverizer 56, and is supplied to the fluidized bed dryer 102.

Here, as the fluidizing gas 52 supplied from the rectifying plate 51 into the raw coal fluidized bed bunker 50, for example, nitrogen, air, or cooling exhaust gas 113 at the time of cooling dry coal is used.

Aeration of the fluidized gas 52 into the raw coal 101 facilitates segregation, and the raw coal fine particles 101A are separated into the upper portion and the raw coal coarse particles 101B are separated into the lower portion.

By setting the flow rate of the fluidizing gas 52 to the optimum flow rate, the raw coal fine particles 101A are supplied to the fluidized bed drying apparatus 102 via the cyclone 54 from above.

On the other hand, when the raw coal coarse particles 101B are concentrated on the lower side of the fluidized bed and fluidized, the large foreign matter 53 is extracted from the lower part.
In addition, the raw coal coarse particles 101B are separated from the foreign matter 53 by being extracted from a predetermined position from the bottom of the fluidized bed to the middle stage.

Raw coal fine 101A of raw coal fluidized bed bunker 50 is when flown up in the freeboard F, by air classification is withdrawn into the cyclone 54 by raw coal fine withdrawal line L _11.
Moreover, since the raw coal coarse particles 101B are put into the pulverizer 56 after removing the foreign matter, extra crushing is not required in the pulverizer 56. Thereby, the power of the pulverizer 56 can be reduced.

Further, since the large foreign matter 53 is removed in advance, troubles in the pulverizer 56 are avoided. For example, the foreign matter 53 may be separated into metal, earth and sand, etc. with a sorter or the like, and again introduced into the raw coal fluidized bed bunker 50 together with the raw coal 101.

As described above, according to the present embodiment, by promoting segregation in the raw coal fluidized bed bunker 50 and classifying the raw coal 101, the raw coal fine particles 101A, the raw coal coarse particles 101B, and the large mass foreign matter 53, The fine coal particles 101A are supplied to the fluidized bed drying apparatus 102 as they are, so that the pulverization by the pulverizer 56 is omitted and the pulverization efficiency of the pulverizer 56 is improved.

In addition, since the large foreign matter 53 is discharged out of the system, only the raw coal coarse particles 101B can be selectively supplied to the pulverizer 56, so that efficient pulverization becomes possible. Therefore, the pulverization capacity of the pulverizer 56 can be reduced and the power can be reduced. Further, since the foreign matter 53 is removed in advance, troubles during pulverization can be avoided.

A gas discharge line L ₄ provided above the drying chamber of the fluidized bed drying apparatus 102 is provided with a dust collector 105 such as a cyclone for removing dust in the generated steam 104 and a downstream side of the dust collector 105. A latent heat recovery system 106 that recovers the heat of the generated steam 104 is provided.

The main body of the fluidized bed drying apparatus 102 is fluidized by fluidized steam 107 introduced from the pores of the rectifying plate 116 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 pulverized charcoal 101C is indirectly dried using the latent heat of the high temperature drying steam (superheated steam) A. I am doing so. The drying steam (superheated steam) A used for drying is discharged to the outside of the fluidized bed drying apparatus 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 heating means, the condensed latent heat radiated at this time is used to heat the pulverized coal 101C for drying. It is used effectively. 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.

The generated steam 104 generated when the pulverized coal 101C pulverized by the heat transfer member 103 is dried is discharged from the free board F formed in the upper space of the fluidized bed 111 in the fluidized bed drying apparatus 102 to the gas discharge line L. ₄ is discharged to the outside of the fluidized bed drying apparatus 102. Since this generated steam 104 contains dried and pulverized powder, it is collected by, for example, a dust collector 105 and separated as dried fine powder 115.
The dried fine powder 115 is merged with the pulverized coal 101C from the pulverizer 56 and is put into the fluidized bed drying apparatus 102.
Dry coal 101D from the fluidized bed dryer 102 is withdrawn from the dry coal discharge line L ₂ is cooled in cooler 110, cooling dry coal 101E is supplied to the coal gasification furnace 14 (see FIG. 3 to be described later) . Note that the dry fine powder 115 may join the dry charcoal 101D.
In the cooler 110, dry coal 101D is cooled by a cooling gas 112 such as nitrogen or air.

On the other hand, the generated steam 104 after being collected by the dust collector 105 is, for example, steam at 105 to 110 ° C., so that the heat is recovered by the latent heat recovery system 106 and then processed by the water treatment unit to be cooled by the cooling water 108. Is contributed to cooling by the cooler 110. 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.

Further, a part of the generated steam 104 after being collected by the dust collector 105 is sent into the fluidized bed drying device 102 by, for example, the circulation fan 114 interposed in the fluidizing gas supply line L ₃ , It is used as fluidized steam 107 for fluidizing a fluidized bed 111 of graded coal 101. 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.

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 low grade coal indirectly was demonstrated, it is not restricted to this, The flow which flows the fluidized bed 111 of low grade coal A configuration in which the low-grade coal is directly dried by the chemical vapor 107, or a configuration in which a fluidizing gas for heating is supplied and dried may be employed.

In this embodiment, the raw coal fine particles 101A and the raw coal coarse particles 101B are obtained by fluidizing the raw coal 101 with the fluidizing gas 52 in the raw coal fluidized bed bunker 50 in the stage before drying in the fluidized bed drying apparatus 102. Since the raw coal coarse particles 101B preliminarily dried with the fluidized gas are pulverized by the pulverizer 56, the low-grade coal supplied to the fluidized bed dryer 102 can be efficiently dried. Can be done.

FIG. 2 is a schematic diagram of a fluidized bed drying facility according to the second embodiment.
As shown in FIG. 2, in the fluidized bed drying equipment 100B according to the present embodiment, a partition wall 81 is partially overflowed in the fluidized bed of the raw coal fluidized bed bunker 50, and the upper part of the partition wall 81 is overflowed in the vicinity of the upper part of the fluidized bed. And an extraction portion 82 for extracting the raw coal fine particles 101A.

Then, the upper portion of the partition wall 81 is dropped to the extraction unit 82 overflowed raw coal fine 101A, by the line L ₁₃ extracts the extracted raw coal particulate 101A raw coal fine, supplies pulverized coal 101C which was ground by a grinder 56 It joins with the pulverized charcoal supply line L ₁ and supplies it to the fluidized bed drying apparatus 102.

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

The gasification combined cycle power generation system (IGCC: Integrated Coal Gasification Combined Cycle) using coal of Example 3 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 3, as shown in FIG. 3, the coal gasification combined power generation facility 10 dries the raw coal 101 provided with the raw coal fluidized bed bunker 50 that predrys the low-grade coal 101 that is the raw coal. Coal gas for supplying combustible gas (product gas, coal gas) 200 by supplying fluidized bed drying equipment 100A (100B) composed of fluidized bed drying apparatus 102A (102B) and cooling dry coal (dry coal) 101E to gasify Gas purification apparatus 15 for purifying the combustor 14, the char recovery device 15 for recovering the char 101F in the combustible gas (product gas, coal gas) 200 as the gasification gas, and the combustible gas (product gas, coal gas) 200A The apparatus 16, the gas turbine equipment 17 that drives the turbine by burning the refined fuel gas 200 B, and the turbine exhaust gas from the gas turbine equipment 17 are introduced. A steam turbine (ST) facility 18 operated by steam generated by a heat recovery boiler (HRSG) 20 and a generator (G) connected to the gas turbine facility 17 and / or the steam turbine facility 18 19).

The low-grade coal supply facility 11 according to this embodiment includes a raw coal fluidized bed bunker 50 and a crusher 56. The raw coal bunker (not shown) can store the raw coal (low-grade coal) 101 and can drop a predetermined amount of the raw coal 101 into the raw coal fluidized bed bunker 50. The raw coal coarse particles 101B dried by the raw coal fluidized bed bunker 50 are crushed to a predetermined size by a pulverizer 56 to obtain crushed coal 101C.

The fluidized bed drying apparatus 102A (102B) uses the apparatus of Example 1 or 2, and after the preliminary drying and classification in the raw coal fluidized bed bunker 50, drying steam ( For example, by supplying superheated steam A) of about 150 ° C., the low-grade coal is heated and dried while flowing, and the moisture contained in the coal 101 can be removed. The fluidized bed drying apparatus 102A (102B) is provided with a cooler 110 that cools the dried dry coal 101D taken out to the outside, and the dried and cooled dried coal 101E is stored in the dried coal bunker 34. . Further, the fluidized bed drying apparatus 102A (102B) 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 particles are generated from the generated steam 104. Dry charcoal particles are separated. The steam from which the dry coal is separated by the dust collector 105 such as a dry coal cyclone may be supplied as the drying steam A to the fluidized bed drying apparatus 102 after being compressed by the steam compressor.

The dried and cooled dry coal 101E dried by the fluidized bed drying apparatus 102 and then cooled by the cooler 110 passes through the dry coal discharge line 123, and then temporarily passes through the bag filter 32 and the bottle system 33. It is stored in the dry charcoal bunker 34.

The coal gasification furnace 14 can supply fine dry coal 101E supplied from the dry coal bunker 34 and can be recycled by returning the char (unburned coal) 101F recovered by the char recovery device 15. It has become.

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 discharge line 123. The second nitrogen supply line 45 is also connected to the coal gasification furnace 14, and the char return line 46 for returning the char 101 F 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 transport gas for dry charcoal 101E and char 101F, and oxygen (O ₂ ) is used as an oxidizing agent.

The coal gasification furnace 14 is, for example, a spouted bed type gasification furnace that combusts and gasifies dry coal 101E, char 101F, 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 101F 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 collection device 15 has a dust collector 58 and a char supply hopper 59. In this case, the dust collector 58 is constituted by one or a plurality of bag filters or cyclones, and can separate the char 101F contained in the combustible gas 200 generated in the coal gasification furnace 14. The combustible gas 200 A from which the char 101 F has been separated is sent to the gas purification device 16 through the gas discharge line 60. The char supply hopper 59 stores the char 101F separated from the combustible gas 200 by the dust collector 58. A bin may be disposed between the dust collector 58 and the supply hopper 59, and a plurality of char supply hoppers 59 may be connected to the bin. A char return line 46 from the char supply hopper 59 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 101F has been separated by the char recovery device 15. Then, the gas purifier 16 purifies the combustible gas 200A from which the char 101F is separated to produce the fuel gas 200B, and supplies this to the gas turbine equipment 17. In this gas purifier 16, since the combustible gas 200A from which the char 101F has been separated still contains sulfur (H ₂ S), for example, by removing it with an amine absorbent or the like, the sulfur content 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 A supplied from the compressor 61 and the fuel gas 200 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 has a turbine 69 connected to the rotating shaft 64 in the gas turbine facility 17, and the generator 19 is connected 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.

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

Here, the operation of the coal gasification combined cycle facility 10 of the third embodiment will be described.

In the combined coal gasification combined power generation facility 10 of the third embodiment, the coal as the raw coal 101 is separated into the raw coal fine particles 101A and the raw coal coarse particles 101B by the raw coal fluidized bed bunker 50 in the low-grade coal supply facility 11. . The separated raw coal coarse particles 101B are supplied to the pulverizer 56 where they are crushed to a predetermined size. Then, the crushed pulverized coal 101C is heated and dried by the fluidized bed drying apparatus 102, and after this dry coal 101D is extracted from the dry coal discharge line 123, the pulverized coal 101C is cooled by the cooler 110 and cooled to dry fine coal 101E. And stored in the dry coal bunker 34.

The cooled dry coal 101E 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 separation device 42. Further, the char 101F recovered by the char recovery device 15 described later is supplied to the coal gasifier 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 101E and char 101F are combusted by compressed air (oxygen) 37, and the dry charcoal 101E and char 101F 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 58, whereby the char 101F contained in the combustible gas 200 is separated here. The combustible gas 200 A from which the char 101 F has been separated is sent to the gas purification device 16 through the gas discharge line 60. On the other hand, the fine char 101F separated from the combustible gas 200 is deposited on the char supply hopper 59, returned to the coal gasifier 14 through the char return line 46, and recycled.

The combustible gas 200A from which the char 101F has been separated by the char recovery device 15 is subjected to gas purification 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 A and supplies it to the combustor 62, the combustor 62 is supplied from the compressed air 40 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 of 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 facility 11 Low-grade coal supply facility 14 Coal gasification furnace 15 Char recovery device 16 Gas purification device 17 Gas turbine facility 18 Steam turbine facility 19 Generator 20 Waste heat recovery boiler 50 Raw coal

fluidized bed bunker

100A, 100B Fluidized bed drying equipment 101 Coking coal (low grade coal)
101A Raw coal fine particles 101B Raw coal coarse particles 101C

Crushed coal

102, 102A, 102B Fluidized bed dryer 103 Heat transfer member (heating means)
104 Generated steam 110 Cooling machine A Drying steam (superheated steam)
B Condensate

Claims

A fluidized bed drying device that flows and dries low-grade coal supplied to the drying chamber by supplying fluidized gas to the drying chamber;
A raw coal fluidized bed bunker that is provided on the upstream side of the fluidized bed drying apparatus and temporarily stores low-grade coking coal,
A raw coal fine particle extraction line for extracting raw coal fine particles from the upper side of the raw coal fluidized bed bunker;
A raw coal coarse particle extraction line for extracting raw coal coarse particles from the lower side of the raw coal fluidized bed bunker;
A crusher for crushing the raw coal coarse particles;
A fluidized bed drying facility comprising a pulverized coal supply line for supplying pulverized pulverized coal to a drying chamber.
In claim 1,
A fluidized bed drying facility comprising: a partition wall formed in a fluidized bed of the raw coal fluidized bed bunker, and a raw coal fine particle extraction line for discharging raw coal fine particles extracted from the partition wall.
Fluidized bed drying equipment 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.