JP2014173790A - Low-grade coal drying facility and gasification hybrid power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide low-grade coal drying facilities and a gasification hybrid power system.SOLUTION: Low-grade coal drying facilities includes: a raw coal fine particle extraction line Lwhich extracts raw coal fine particles 101a from an upper side of a raw coal flow layer banker 102; a raw coal coarse particle extraction line Lwhich extracts raw coal coarse particles 101b from a lower side thereof; a pulverizer 103 which pulverizes the raw coal coarse particles 101b; an air current transfer line Lwhich transfers the pulverized fine coal 101c from the pulverizer 103 with an air current; a separator 104 which separates a transfer gas from the respectively introduced raw coal fine particles 101a and fine coal 101c; a flow layer drying bin 105 which supplies the fine coal 101c having the transfer gas separated to a drying chamber through a fine coal supply line Land dries the fine coal 101c supplied to a drying chamber in a flowing state with fluidizing gas 105b so as to accumulate dry coal; and a pressure bin 107 which supplies the dry coal 101d having been dried by the flow layer drying bin 105 to a coal gasification furnace 14 by a predetermined amount.

Description

  The present invention relates to a low-grade coal drying facility and a gasification combined power generation system that efficiently dry low-grade coal having a high water content.

  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 power generation facility (IGCC) is also known to be able to use coal with abundant resources, and it is known that the benefits will be further increased by expanding the applicable coal types. .

  Conventional coal gasification combined power generation facilities (IGCC) generally include coal supply equipment, drying equipment, coal gasification furnace, gas purification equipment, gas turbine equipment, steam turbine equipment, exhaust heat recovery boiler, gas purification equipment, etc. have. 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 facility (IGCC) is a high-grade coal (high-grade coal) having a high calorific value such as bituminous coal or anthracite coal.
Coal supplied to the coal gasification combined power generation facility (IGCC) needs to be pulverized from the viewpoints of reactivity in the 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 coarsely pulverized by a pulverizer (for example, Hanmark Crusher), and then the coarsely pulverized product is dried by a dryer and stored in a dry coal bunker. Subsequently, it is supplied to a coal mill (for example, vertical mill etc.) by a coal feeder, where it is pulverized and dried to be pulverized coal. Thereafter, the pulverized coal is transported from the transport gas and supplied to the gasifier (Patent Document 1).

JP 7-279621 A

  By the way, in recent years, in addition to high-grade coal (high-grade coal) having a high calorific value such as bituminous coal and anthracite coal, for example, low moisture having a relatively high calorific value such as sub-bituminous coal and lignite coal. Although it has been proposed to gasify using low-grade coal (also referred to as “low-grade coal” or “high-moisture coal”), this low-grade coal has a high water content (for example, about 60 moisture). %), The amount of water brought in is large and power generation efficiency decreases due to this moisture. In the case of low-grade coal, the low-grade coal is dried by the above-mentioned drying device to remove moisture, and further coal When pulverized by a mill and supplied to a gasification furnace, there are problems that the number of equipment increases, the system becomes complicated, and the equipment cost required for drying increases.

  Therefore, the appearance of a low-grade coal drying facility that can be supplied in a compact manner to a gasification system that gasifies low-grade coal and can reduce costs is eagerly desired.

  In view of the above problems, an object of the present invention is to provide a low-grade coal drying facility and a combined gasification power generation system that can be compactly supplied to a gasification system that gasifies low-grade coal.

  A first invention of the present invention for solving the above-described problems is a raw coal fluidized bed bunker that stores low grade coking coal while temporarily flowing, and raw coal from above the raw coal fluidized bed bunker. The raw coal fine particle extraction line for extracting fine particles, the raw coal coarse particle extraction line for extracting the raw coal coarse particles from the lower side of the raw coal fluidized bed bunker, and the raw coal introduced from the raw coal coarse particle extraction line A pulverizer for finely pulverizing coarse particles, an airflow conveyance line for conveying the pulverized pulverized coal by airflow from the pulverizer, a raw coal fine particle extraction line, and a raw coal fine particle and fine powder respectively introduced from the airflow conveyance line A separator for separating the carrier gas from the charcoal, and a drying chamber to which the pulverized coal from which the carrier gas has been separated by the separator is supplied, and drying while flowing the pulverized coal supplied by the fluidizing gas Fluidized bed drying container for storing charcoal If there the dry coal was dried in a fluid bed drying bottles, the low-grade coal drying installation, characterized in that it comprises a predetermined quantity supplied pressurized bottle to the coal gasification furnace.

  The second invention includes the low-grade coal drying facility of the first invention, a coal gasification furnace that processes dry coal supplied from the low-grade coal drying facility and converts it into gasification gas, and the gasification gas. Turbine (ST) operated with steam generated by an exhaust heat recovery boiler that introduces turbine exhaust gas from the gas turbine, the gas turbine and / or the steam A gasification combined power generation system comprising a generator (G) connected to a turbine.

  According to the present invention, primary drying is performed with a raw coal fluidized bed bunker, and raw coal of low-grade coal is separated into raw coal fine particles and raw coal coarse particles while pre-drying, and the separated raw coal coarse particles are: For example, crushing and drying are simultaneously performed by a crusher such as a vertical mill. Since the pulverized coal is subjected to fluidized-bed drying using a fluidized-bed drying bottle and finish-dried, the drying equipment for low-grade coal can be made compact.

FIG. 1 is a schematic view of a low-grade coal drying facility according to the first embodiment. FIG. 2 is a schematic configuration diagram of the combined gasification power generation system according to the second embodiment.

  Hereinafter, preferred embodiments of 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 low-grade coal drying facility according to the present embodiment.
As shown in FIG. 1, a low-grade coal drying facility 100 according to the present embodiment includes a raw coal fluidized bed bunker 102 that temporarily stores low grade coking coal 101 while flowing, and a raw coal fluidized bed bunker 102. extracting the following raw coal fine 101a from the upper side for example 1mm, as raw coal fine withdrawal line L _1, extract the raw coal grit 101b from the lower side e.g. 1mm or more of raw coal fluidized bed bunker 102 extracts original Sumiara particle and line L _2, the raw Sumiara particle extraction line L ₂ from the introduced the original Sumiaratsubu 101b pulverizer milling (vertical mill, cage mill) and 103, ground e.g. 1mm or less of the pulverized coal 101c and a pneumatic conveying line L ₃ to the air flow conveyed from the crusher 103, the raw coal fine withdrawal line L _1, from the raw coal fine 101a and pulverized coal 101c which are each introduced from the pneumatic conveying line L ₃ Metropolitan A separator 104 which separates the feed gas, the pulverized coal 101c which conveying gas is separated in separator 104, and supplied to the drying chamber by charcoal supply line L _4, which is supplied to the drying chamber by fluidizing gas 105b fines A fluidized bed drying bin 105 that dries while flowing the charcoal 101c and stores the dried charcoal, and a pressure bin 107 that supplies a predetermined amount of the dried charcoal 101d dried in the fluidized bed drying bin 105 to the coal gasification furnace 14. It has.

As shown in FIG. 1, the raw coal fluidized bed bunker 102 is provided on the upstream side of the pulverizer 103 and preliminarily drys the raw low-grade coal with the fluidizing gas 122.
During this pre-drying, the raw coal fine 101a which is pre-dried is present in soar gas into the freeboard F, by the line L ₁ extracts the raw coal fine 101a raw coal fine, withdrawal, raw coal fine the extraction line L separator 104, such as is interposed example cyclone ₁ separates the exhaust gas 130 and the raw coal fine 101a. The separated raw coal fine 101a is because it is pulverized coal 101c, through the pulverized coal feed line L _4, and then supplied directly to the fluidized bed drying bottle 105.

  Here, as the fluidizing gas 122 supplied from the rectifying plate 121 into the raw coal fluidized bed bunker 102, for example, nitrogen or air is used. Moreover, you may make it provide the heating means for heating a fluidized bed from the outside.

  By aeration of the fluidizing gas 122 in the raw coal 101, segregation is promoted, 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 122 to the optimum flow rate, the raw coal fine particles 101a are supplied to the fluidized bed drying bottle 105 from above via the separator 104 such as a cyclone.

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 123 is extracted from the lower part.
The raw coal coarse particles 101b are separated from the foreign matter 123 by being extracted from a predetermined position from the bottom of the fluidized bed to the middle stage.

When the raw coal fine particles 101a in the raw coal fluidized bed bunker 102 soar into the free board F, they are extracted to the separator 104 by the raw coal fine particle extraction line L ₁ by air classification.

  In addition, since the raw coal coarse particles 101b are put into the pulverizer 103 after removing the foreign matter, the pulverizer 103 does not need to be excessively crushed. Thereby, the power of the pulverizer 103 can be reduced.

  In addition, since the large foreign matter 123 is removed in advance, trouble in the crusher 103 is avoided. For example, the foreign matter 123 may be separated from metal, sand, and the like with a sorter or the like, and re-entered into the raw coal fluidized bed bunker 102 together with the raw coal 101.

Hara Sumiaratsubu 101b withdrawn in the original Sumiara particle withdrawal line L _2, for example, a grinder 103, such as vertical mill or a cage mill, a predetermined particle size (e.g., 1mm) is ground to below, together with the carrier gas, stream It is transported to a separator 104 such as a cyclone by a transport line L ₃ , where the transport gas is separated together with dust as exhaust gas 130, and the pulverized coal 101 c is transported to the fluidized bed drying bottle 105 by the pulverized coal line L ₄ .
The crusher 103 is supplied with a direct heating gas (steam) 103a that directly heats the raw coal coarse particles 101b, and also serves as a carrier gas.
Here, the predetermined particle size refers to the maximum particle size allowed as gasified fuel in the coal gasification furnace 14 and is appropriately changed by the coal gasification furnace 14.

The separated dust and exhaust gas are sent to the dust removal equipment 131, where the dust 132 is separated, the condensed water 134 is separated by the condenser 133, and the separated condensed water 134 is separately treated by the waste water treatment equipment.
Further, the separated exhaust gas 135 is reused as fluidized gas in the raw coal fluidized bed bunker 102, for example.

The dust 132 separated by the dust removal equipment 131 is sent to the fluidized bed drying bottle 105 via the dust supply line L ₅ .

  The main body of the fluidized bed drying bottle 105 is fluidized by the fluidized gas 105b introduced from the pores of the rectifying plate 105a to form the fluidized bed 105c.

  The heat transfer member 105d is disposed in the fluidized bed 105c. For example, 150 ° C. drying steam (superheated steam) A is supplied into the heat transfer member 105d, and the pulverized coal 101c is indirectly finished and 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 out of the fluidized bed drying bottle 105 as, for example, condensed water B at 150 ° C.

  That is, since the drying steam (superheated steam) A condenses into a liquid (moisture) on the inner surface of the heat transfer member 105d as a heating means, the condensed latent heat radiated at this time is used to heat the drying of the pulverized coal 105c. 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. In addition to using a heat medium as the heat transfer member 105d, an electric heater may be installed.

Generating steam 105e that is generated when the pulverized coal 101c is dried by the heat transfer member 105d is in a fluidized bed drying bottle 105, the fluidized bed by the gas discharge line L ₆ from the free board which is formed in the upper space of the fluidized layer 105c It is discharged outside the drying bottle 105. Since the generated steam 105e contains dried and pulverized powder, it is removed by, for example, the dust removing equipment 131 and separated as dust 132. The separated dust 132 is supplied to the fluidized bed drying bottle 105 through the dust supply line L ₅ .

Dry coal 101d from the fluidized bed drying bottle 105 is withdrawn from the dry coal discharge line L ₇ is sent to the pressure bottle 107, it is supplied to the coal gasification furnace 14.

  A part of the generated steam collected by the dust removal equipment 131 is sent into the fluidized bed drying bottle 105 and used as fluidized steam that causes the fluidized bed 105c of the pulverized coal 101c to flow. In this embodiment, the fluidized medium for fluidizing the fluidized bed 105c reuses a part of the generated steam, but is not limited thereto, and includes, for example, nitrogen, carbon dioxide, or these gases. Low oxygen concentration air may be used.

In addition, although a present Example has illustrated the tube-shaped heat transfer member as the heat transfer member 105d 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 105d and dries the pulverized coal 101c indirectly was demonstrated, it is not restricted to this, The flow which flows the fluidized bed 105c of the pulverized coal 101c A configuration in which the pulverized coal 101c is directly dried by chemical vapor, or a configuration in which a heating fluidizing gas is supplied and dried may be employed.

In this example, primary drying is performed in the raw coal fluidized bed bunker 102, and the raw coal 101 of the low-grade coal is separated into raw coal fine particles 101a and raw coal coarse particles 101b while being pre-dried. The particles 101b are simultaneously pulverized and dried by a pulverizer 103 such as a vertical mill.
Drying by the pulverizer 103 is secondary drying, and the pulverized coal water at the mill outlet is controlled within a range not blocked by the conveying system in order to convey the pulverized coal 101c by airflow.

  Here, as the moisture content in the range without clogging, for example, 60% is dried to about 55% or less.

  The pulverized coal 101c finely pulverized by the vertical mill is conveyed to the IGCC coal gasification furnace 14 to the fluidized bed drying bin 105 of the pulverized coal supply system by airflow conveyance.

  Here, the drying heat source at the time of pulverization in the pulverizer 103 such as a vertical mill can utilize waste heat such as exhaust gas from the boiler for the trace steam, and heat strengthening such as heating by supplying steam to the pulverization table etc. Can also be done.

  The transported pulverized coal 101c is stored in the bin of the IGCC pulverized coal supply system. In this embodiment, fluidized bed drying is performed using the fluidized bed drying bin 105 in the bin system of the storage facility. I try to finish dry.

In the fluidized bed drying bottle 105, as the fluidizing gas 105b, for example, surplus N _{2 of the} IGCC plant, inert N ₂ , exhaust gas of the trace steam boiler, surplus steam, or the like can be used.

  As a heat source for indirect heating of the fluidized bed drying bottle 105, steam turbine extraction steam or the like in the plant can be used.

In this embodiment, the use of the bottle of the IGCC pulverized coal supply system as the storage container / drying device eliminates the need to provide a separate large drying device.
As a result, the entire pulverized coal supply system from the drying of low-grade coal (high moisture coal) to the coal gasification furnace 14 can be simplified.
Therefore, since the low-grade coal drying equipment 100 of the present embodiment does not use a large fluidized bed drying equipment as in the prior art, the drying equipment can be made compact.

  In addition, instead of a large-scale drying facility, primary drying, secondary drying, and tertiary drying are shared, so that the moisture content is, for example, 30% and dry coal 101d with some moisture remaining, When there is a demand for gasification in the coal gasification furnace 14 using such dry coal 101d containing a large amount of moisture, it is possible to avoid significant equipment and costs for drying low-grade coal. Become.

In the present embodiment, the pulverized coal 101c pulverized by the pulverizer 103 can be conveyed to the IGCC pulverized coal supply system by airflow conveyance. Therefore, conventional safety measures (N ₂ inerting, airtight structure) are taken. For example, it is not necessary to separately install mechanical transport equipment such as a scraper chain conveyor.

  Further, since the fluidized bed drying of the pulverized coal 101c having a predetermined particle size or less is performed, it is not necessary to use a large fluidized bed drying apparatus, the compact fluidized bed drying bottle 105 can be used, and the gas flow rate of the fluidized gas. In addition, since the heat transfer coefficient outside the tube by indirect heating can be increased, the drying performance is higher than that of the coarse-grained fluidized bed drying equipment.

  Further, since the dried dry charcoal 101d is conveyed to the lower pressure bottle 107 in a fluidized state, the risk of blockage and the like is reduced.

Here, the bottom of the conventional storage bin is usually inclined to ensure the angle of repose of the powder (coal) or more, but by using the fluidized bed drying bin 105, there is a risk of clogging / adhering the pulverized coal 101c. In order to reduce, it becomes possible to make a bottom part into a flat structure.
For this reason, unlike the conventional bottle which secures the angle of repose or more, it contributes to the reduction of the overall height of the pulverized coal supply system including the fluidized bed drying bottle 105 and the pressure bottle 107, and the apparatus configuration is made compact. Can be achieved.

  Thus, according to the present embodiment, by promoting segregation in the raw coal fluidized bed bunker 102 and classifying into the raw coal 101, the raw coal fine particles 101a, the raw coal coarse particles 101b, and the large foreign matter 123, The raw coal fine particles 101a are supplied as they are to the fluidized bed drying bottle 105, so that the pulverization in the pulverizer 103 is omitted and the pulverization efficiency of the pulverizer 103 is improved.

  Further, since the large foreign matter 123 is discharged out of the system, only the raw coal coarse particles 101b can be selectively supplied to the pulverizer 103, so that efficient pulverization is possible. Therefore, it is possible to reduce the pulverization capacity of the pulverizer 103 and reduce the power. In addition, since the foreign matter 123 is removed in advance, troubles during pulverization can be avoided.

A gas discharge line L ₆ provided above the drying chamber of the fluidized bed drying bottle 105 is sent to a dust removal equipment 131 such as a cyclone that removes dust in the generated steam 105e, where the dust 132 is separated and a condenser. In 133, the condensed water 134 is separated, and the separated condensed water 134 is separately treated in a wastewater treatment facility.

  FIG. 2 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. 2, the coal gasification combined power generation facility 10 pulverizes raw coal fluidized bed bunker 102 that pre-drys low-grade coal as raw coal 101 and raw coal coarse particles 101b. A low-grade coal drying facility 100 comprising a pulverizing machine 103, a fluidized bed drying bottle 105 for drying the pulverized coal 101c finely pulverized by the pulverizer 103, and a dry coal 101d for gasification and combustible gas (Generated gas, coal gas) 200, a coal gasification furnace 14, a char recovery device 15 that recovers char 101F in combustible gas (generated gas, coal gas) 200, which is a gasification gas, and a combustible gas (Production gas, coal gas) A gas purification device 16 for purifying 200A, a gas turbine facility 17 for burning the purified fuel gas 200B to drive a turbine, and a gas turbine facility 17 It is connected to a steam turbine (ST) facility 18 operated by steam generated by a heat recovery steam generator (HRSG) 20 that introduces the turbine exhaust gas, and a gas turbine facility 17 and / or a steam turbine facility 18. Generator (G) 19.

  The low-grade coal drying facility 100 according to this embodiment includes a primary drying raw coal fluidized bed bunker 102, a secondary drying pulverizer 103, and a tertiary drying fluidized bed drying bottle 105. The raw coal bunker (not shown) can store the raw coal 101 of low-grade coal, and can drop a predetermined amount of raw coal 101 into the raw coal fluidized bed bunker 102. The raw coal coarse particles 101b primarily dried by the raw coal fluidized bed bunker 102 are pulverized to a predetermined size by a pulverizer 103 to form pulverized coal 101c.

  The dry charcoal 101 d subjected to the tertiary drying in the fluidized bed drying bin 105 is supplied to the coal gasification furnace 14 via the pressure bin 107.

  The coal gasification furnace 14 can supply the fine dry coal 101d, and the char (unburned coal) 101F recovered by the char recovery device 15 is returned and can be recycled.

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 nitrogen supply line 43 is connected to a dry coal supply line L _8. 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 101d 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 101d, 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 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 101F 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> F has been separated is sent to the gas purifier 16 through the gas discharge line 53. The char supply hopper 52 stores the char 101F separated from the combustible gas 200 by the dust collector 51. A bin may be disposed between the dust collector 51 and the char supply hopper 52, and a plurality of char supply hoppers 52 may be connected to the bin. A char return line 46 from the char 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 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 </ 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 operation of the coal gasification combined cycle facility 10 of the second embodiment will be described.

  In the coal gasification combined power generation facility 10 of the second embodiment, in the low-grade coal drying facility 100, the low-grade coal as the raw coal 101 is changed into the raw coal fine particles 101a and the raw coal coarse particles 101b in the raw coal fluidized bed bunker 102. To separate. The separated raw coal coarse particles 101b are supplied to the pulverizer 103, where they are crushed to a predetermined size. The crushed pulverized coal 101c is then sent to the fluidized bed drying bottle 105, where it is finish-heated and dried and stored.

Pooled dry coal 101d via a pressure bottle 107, supplied by the nitrogen supplied from the air separation unit 42 through a dry coal supply line L ₈ to the coal gasification furnace 14. 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 101d and char 101F are combusted by the compressed air (oxygen) 37, and the dry charcoal 101d and char 101F are gasified, thereby combustible mainly containing 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 F contained in the combustible gas 200 is separated here. The combustible gas 200 </ b> A from which the char 101 </ b> F has been separated is sent to the gas purifier 16 through the gas discharge line 53. On the other hand, the fine char 101F separated from the combustible gas 200 is deposited on the char supply hopper 52, returned to the coal gasification furnace 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 </ 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 14 Coal gasification furnace 15 Char recovery equipment 16 Gas refinement equipment 17 Gas turbine equipment 18 Steam turbine equipment 19 Generator 20 Waste heat recovery boiler 100 Low-grade coal drying equipment 101 Coal coal (low-grade coal)
101a Raw coal fine particles 101b Raw coal coarse particles 101c Fine coal 101d Dry coal 102 Raw coal fluidized bed bunker 103 Pulverizer 104 Separator 105 Fluidized bed drying bottle

Claims (2)

Raw coal fluidized bed bunker that stores low-quality coking coal while temporarily flowing,
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 pulverizer for finely pulverizing the raw coal coarse particles introduced from the raw coal coarse particle extraction line;
An air current conveying line for air conveying the pulverized pulverized coal from the pulverizer;
A separator that separates the carrier gas from the raw coal fine particles and the pulverized coal introduced from the raw coal fine particle extraction line and the air flow conveyance line, respectively;
A fluidized bed drying bottle that has a drying chamber to which pulverized coal from which the carrier gas is separated by the separator is supplied, is dried while flowing the pulverized coal supplied by the fluidizing gas, and stores dry coal;
A low-grade coal drying facility, comprising: a pressurized bin for supplying a predetermined amount of dry coal dried in the fluidized bed drying bin to a coal gasification furnace. The low-grade coal drying facility of claim 1;
A coal gasification furnace that processes dry coal supplied from the low-grade coal drying facility 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 comprising the generator (G) connected to the gas turbine and / or the steam turbine.

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