WO2012133549A1

WO2012133549A1 - Wet material supplying facility and gasification composite power generation system using wet material

Info

Publication number: WO2012133549A1
Application number: PCT/JP2012/058178
Authority: WO
Inventors: 章悟吉田
Original assignee: 三菱重工業株式会社
Priority date: 2011-03-31
Filing date: 2012-03-28
Publication date: 2012-10-04
Also published as: AU2012233514A1

Abstract

The invention comprises: a pulverizer (23) for pulverizing low-grade coal (101) supplied from a raw coal banker (21); a fluidized-bed dryer (12) for drying pulverized low-grade coal (101A) which has been pulverized; and a dried coal supplying line (35) for supplying dried coal (101B), which has been dried by the fluidized-bed dryer (12), to a coal gasification furnace (14), whereby the dried and pulverized low-grade coal is supplied at a high efficiency to a gasification system which performs gasification. This makes it possible to achieve gasification by merely coarsely pulverizing and drying the low-grade coal, without using a coal powdering machine for powdering as in the prior art, whereby the device and utility cost can be reduced significantly.

Description

Combined gasification combined cycle system using wet raw material supply facility and wet raw material

The present invention relates to a wet raw material supply facility capable of efficiently supplying a gasification system for gasifying a wet raw material such as low grade coal and a gasification combined power generation system using the wet raw material.

For example, a coal gasification combined cycle power generation facility is a power generation facility aiming at higher efficiency and higher environmental performance than conventional coal thermal power by gasifying coal and combining it with combined cycle power generation. This coal gasification combined cycle power generation facility is also a great advantage to be able to use coal rich in resource amount, and it is known that the merit will be further increased by expanding the type of applied coal.

Conventional coal gasification combined cycle power generation facilities generally include a coal feeding device, a drying device, a coal gasification furnace, a gas purification device, a gas turbine equipment, a steam turbine equipment, an exhaust heat recovery boiler, a gas purification device, etc. ing. Therefore, the coal is dried and then crushed, and supplied as pulverized coal to the coal gasification furnace, and air is taken in, and the coal is burned and gasified in this coal gasification furnace to form product gas (flammable Gas) is produced. Then, the product gas is gas-refined and then supplied to the gas turbine equipment to burn it and generate high-temperature and high-pressure combustion gas to drive the turbine. After driving the turbine, the exhaust gas is recovered by the waste heat recovery boiler to generate thermal energy, which is supplied to steam turbine equipment to drive the turbine. This generates power. On the other hand, exhaust gas from which thermal energy has been recovered is released to the atmosphere through a chimney after the harmful substance is removed by the gas purification device.

The coal to be supplied to the integrated coal gasification combined cycle power generation system (IGCC) needs to be pulverized from the viewpoint of reactivity and gas flow in the gasification furnace, and a coal mill is used as a pulverized coal machine. For this reason, the coal supplied as a raw material is first roughly crushed by a crusher, and then dried by a drier and then stored by a dry coal bunker. Then, it is supplied to a coal mill by a coal feeder, pulverized and dried there to be pulverized coal, and then transported from a carrier gas and supplied to a gasification furnace (Patent Document 1).

Japanese Patent Application Laid-Open No. 7-279621

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, it has a relatively low calorific value such as subbituminous coal and brown coal which has a large moisture content It is proposed to gasify using high grade coal (also referred to as "low grade coal" or "high moisture coal"), but this low grade coal has a high moisture content (for example, about 60 %), The amount of water carried in is large, and the power generation efficiency is lowered due to this water content. In the case of low grade coal, low grade coal is dried by the above-mentioned drying apparatus to remove water, and further crushed. In the case of crushing by a mill and supplying to a gasification furnace, there are problems that the number of equipment is large, the system becomes complicated, and the equipment cost becomes high.

Therefore, there is a strong demand for the appearance of low-grade coal supply equipment that can be supplied with high efficiency to a gasification system that gasifies low-grade coal and can reduce costs.

In view of the above problems, it is an object of the present invention to provide a wet raw material supply facility capable of efficiently supplying a gasification system for gasifying low grade coal with high efficiency and a gasification combined power generation system using the wet raw material. Do.

According to a first aspect of the present invention for solving the above-mentioned problems, there are provided a crusher for grinding a wet raw material supplied by a raw material supply means, a drying device for drying the crushed wet raw material, and the drying device. And a dry raw material supply line for supplying dried dry raw material to the gasification furnace.

According to a second aspect of the present invention, there is provided a wet raw material supply facility including a dry raw material supply line for supplying fine particles dried and separated by the drying device to the gasification furnace according to the first aspect of the invention.

A third aspect of the present invention is the wet raw material supply facility according to the first or second aspect, further comprising a combustion furnace for burning the coarse particles dried by the drying device.

In a fourth invention according to any one of the first to third inventions, the coarse particles dried by the dryer are supplied to one or both of the upstream side of the crusher and the inlet of the dryer. It is a wet raw material supply facility characterized by having a circulation line.

A fifth aspect of the invention is the wet raw material supply system according to any one of the first to fourth aspects, wherein the empty velocity in the gasification furnace is an empty velocity at which the dried dry material does not fall. In the equipment.

6th invention is 1st invention, The said drying apparatus is a fluid bed drying apparatus which has a fluid bed drying chamber which dries a wet raw material, It grind | pulverizes from the said grinder to the one end side of this fluid bed drying apparatus. And a fluidizing gas feed line for forming a fluid bed with the wet material by feeding the fluidizing gas to the lower part of the fluid bed drying chamber; A gas discharge line for discharging fluidizing gas and generated steam from above, a heating unit for heating the pulverized wet material supplied in the fluid bed, and the vicinity of the upper part of the fluid bed on the side different from the wet material feed line. And a coarse-grained dry raw material for discharging the coarse-grained dry raw material from the vicinity of the bottom of the fluidized bed on the side different from the fine-grain-dried raw material discharge line for discharging the dry raw material for fine grains dried by heating I was provided with a line out, and a wet raw material supply equipment and supplying the fine dry ingredients discharged from fine dry ingredients discharge line to the dry material feed gasifier side by the line.

According to a seventh aspect of the present invention, there is provided a wet raw material supply line according to the sixth aspect, comprising: In the equipment.

An eighth aspect of the invention is a wet raw material supply facility according to any one of the first to seventh aspects, a gasification furnace for processing the dried dry raw material supplied from the wet raw material supply facility and converting it into gasification gas, A gas turbine (GT) operated with gasification gas as fuel, a steam turbine (ST) operated with steam generated by an exhaust heat recovery boiler for introducing turbine exhaust gas from the gas turbine, the gas turbine and / or Alternatively, the present invention provides a gasification combined power generation system using a wet raw material, comprising: a generator (G) connected to the steam turbine.

According to the wet raw material supply facility of the present invention, it becomes possible to gasify only by drying the wet raw material without using the pulverized coal machine as in the prior art, and the equipment and utility costs are significantly reduced. can do.

FIG. 1 is a schematic configuration diagram of a combined gasification combined cycle power generation system using low grade coal having a low grade coal supply facility according to a first embodiment. FIG. 2 is a schematic view of a low grade coal supply facility according to a first embodiment. FIG. 3 is a schematic configuration diagram of a combined gasification combined cycle power generation system using low grade coal having a low grade coal supply facility according to a second embodiment. FIG. 4 is a schematic view of a low grade coal supply facility according to a third embodiment. FIG. 5 is a schematic view of a low grade coal supply facility according to a fourth embodiment. FIG. 6 is a diagram showing the relationship between various coals and the HGI index. FIG. 7 is a view showing an example of the particle size distribution of dry coal.

Hereinafter, preferred embodiments of a low grade coal supply facility according to the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments, and in the case where there are a plurality of embodiments, the present invention also includes those configured by combining the respective embodiments.

FIG. 1 is a schematic configuration diagram of a combined gasification combined cycle power generation system using low grade coal having a low grade coal supply facility according to a first embodiment.

The integrated coal gasification combined cycle (IGCC) using low-grade coal of Example 1 adopts an air combustion system in which coal gas is generated in a gasification furnace using air as an oxidant, and a gas purification apparatus The coal gas purified by the above is supplied as a fuel gas to a gas turbine facility to generate electricity. That is, the integrated coal gasification combined cycle power generation facility of the present embodiment is an air combustion type (air blowing) power generation facility. In the present embodiment, low-grade coal, for example, is used as the wet raw material supplied to the gasification furnace.

In Example 1, as shown in FIG. 1, the coal gasification combined cycle power generation facility 10A includes a low grade coal supply facility 11 (11A, 11B, 11C) for supplying low grade coal 101, which is raw material coal, and low grade coal. A fluidized bed drying apparatus 12 for drying 101, a coal gasification furnace 14 for supplying dried low grade coal (dry coal) 101B to gasify and generating combustible gas (produced gas, coal gas) 200, and gasified gas , A char recovery device 15 for recovering the char 101C in the combustible gas (product gas, coal gas) 200, a gas purification device 16 for purifying the combustible gas (product gas, coal gas) 200A, and a purified fuel A gas turbine equipment 17 for burning a gas 200B to drive a turbine, and an exhaust heat recovery boiler (Heat Recover for introducing turbine exhaust gas from the gas turbine equipment 17) Steam generator (ST) facility 18 operated by the steam generated by HRSG) 20 and a generator (G) 19 connected to the gas turbine facility 17 and / or the steam turbine facility 18 ing.

The low grade coal supply facility 11 according to the present embodiment has a raw coal bunker 21, a coal supply machine 22, and a crusher 23. The raw coal bunker 21 can store low grade coal 101, and can drop a predetermined amount of low grade coal 101 onto the coal feeder 22. The coal feeder 22 can convey the low-grade coal 101 dropped from the raw coal bunker 21 by, for example, a conveyor, and can drop it onto the crusher 23. The crusher 23 can crush the low-grade coal 101 that has been dropped into a predetermined size, and can make the crushed low-grade coal (crushed coal) 101A.

The fluidized bed drying apparatus 12 flows the low grade coal 101 by supplying drying steam (for example, superheated steam of about 150 ° C.) A to the low grade coal 101 charged by the low grade coal supply facility 11. The drying is carried out while heating, and the water contained in the low grade coal 101 can be removed. Then, the fluid bed drying apparatus 12 is provided with a cooler 31 for cooling the dried dried coal 101B taken out to the outside, and the dried and cooled dried coal 101B is stored in the dried coal bunker 34. Further, the fluidized bed drying apparatus 12 is provided with a dust collector 30 such as a dry charcoal cyclone or the like for separating particles of dry charcoal entrained by generated steam 104 taken out from the upper part. The particles are separated. The steam from which dry coal has been separated by the dust collector 30 such as a cyclone may be compressed by the steam compressor and then supplied to the fluid bed drying apparatus 12 as drying steam.

The dried and cooled dried coal 101 B dried in the fluidized bed drying device 12 and then cooled is then stored in the temporarily dried coal bunker 34 via the bag filter 32 and the bottle system 33.

The coal gasification furnace 14 can be supplied with the dried coal 101B supplied from the dried coal bunker 34, and the char (unburned component of coal) 101C recovered by the char recovery device 15 is returned to be recyclable. ing.

That is, in the coal gasifier 14, the compressed air supply line 41 is connected from the gas turbine equipment 17 (compressor 61), and compressed air compressed by the gas turbine equipment 17 can be supplied. The air separation device 42 separates and generates nitrogen (N ₂ ) and oxygen (O ₂ ) from the air 40 in the atmosphere, and the first nitrogen supply line 43 is connected to the coal gasifier 14, and The nitrogen supply line 43 is connected to the dry charcoal supply line 35. In addition, the second nitrogen supply line 45 is also connected to the coal gasifier 14, and the second nitrogen supply line 45 is connected to the char return line 46 for returning the char 101 C recovered from the char recovery device 15. Furthermore, the oxygen supply line 47 is connected to the compressed air supply line 41. In this case, nitrogen (N ₂ ) is used as a carrier gas for the dried carbon 101 B and the char 101 C, and oxygen (O ₂ ) is used as an oxidant.

The coal gasification furnace 14 is, for example, a spouted bed type gasification furnace, which burns and gasifies dry coal 101B, char 101C, air (oxygen), or steam as a gasifying agent supplied to the inside. At the same time, a combustible gas (product gas, coal gas) 200 mainly composed of carbon monoxide is generated, and the combustible gas 200 is used as a gasifying agent to generate a gasification reaction. The coal gasifier 14 is provided with a foreign matter removing device 48 for removing foreign matter such as molten slag mixed with pulverized coal.
Although a spouted bed gasifier is illustrated as the coal gasifier 14 in the present example, the present invention is not limited to this, and may be, for example, a fluidized bed gasifier or a fixed bed gasifier. And this coal gasifier 14 is provided with the gas production line 49 of the combustible gas 200 toward the char recovery device 15, and the combustible gas 200 containing char 101C can be discharged. In this case, the combustible gas 200 may be cooled to a predetermined temperature and then supplied to the char recovery device 15 by separately providing a gas cooler in the gas generation line 49.

The char recovery device 15 has a dust collector 51 and a char feeding hopper 52. In this case, the dust collection device 51 is configured of one or more bag filters or cyclones, and can separate the char 101C contained in the flammable gas 200 generated by the coal gasifier 14. Then, the combustible gas 200A from which the char 101C is separated is sent to the gas purification device 16 through the gas discharge line 53. The char supply hopper 52 stores the char 101C separated from the combustible gas 200 by the dust collection device 51. A bin may be disposed between the dust collector 51 and the char feeding hopper 52, and a plurality of feeding hoppers 52 may be connected to the bin. The 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 with respect to the combustible gas 200A from which the char 101C has been separated by the char recovery device 15. Then, the gas purification device 16 purifies the combustible gas 200 A from which the char 101 C is separated to produce the fuel gas 200 B, and supplies this to the gas turbine equipment 17. In the gas purification apparatus 16, since the combustible gas 200A from which the char 101C is separated still contains sulfur (H ₂ S), the sulfur content can be reduced by, for example, removing it with an amine absorbing solution or the like. Finally, it is recovered as gypsum and effectively used.

The gas turbine equipment 17 includes a compressor 61, a combustor 62, and a turbine 63. The compressor 61 and the turbine 63 are connected by a rotating shaft 64. The combustor 62 is connected to the compressed air supply line 65 from the compressor 61, is connected to the fuel gas supply line 66 from the gas purification device 16, and is connected to the combustion gas supply line 67 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 gasifier 14, and a booster 68 is provided in the middle. Therefore, in the combustor 62, the compressed air 40A supplied from the compressor 61 and the fuel gas 200B supplied from the gas purification device 16 are mixed and burned, and the turbine 63 generates a rotation shaft by the generated combustion gas 202. By rotating 64, the generator 19 can be driven.

The steam turbine installation 18 has a turbine 69 connected to a rotating shaft 64 in the gas turbine installation 17, and a generator 19 is connected to the proximal end of the rotating shaft 64. The exhaust heat recovery boiler 20 is provided in an exhaust gas line 70 from the gas turbine equipment 17 (turbine 63), and generates steam 204 by performing heat exchange between the air 40 and the high temperature exhaust gas 203. It is. Therefore, the waste heat recovery boiler 20 is provided with the steam supply line 71 for supplying the steam 204 between the turbine 69 of the steam turbine equipment 18 and the steam recovery line 72, and the steam recovery line 72 is provided with a condenser. 73 are 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 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 integrated coal gasification combined cycle plant 10A of the first embodiment will be described.

In the integrated coal gasification combined cycle power generation facility 10A of the first embodiment, the low grade coal 101, which is raw coal, is stored in the raw coal bunker 21 at the low grade coal supply facility 11 (11A, 11B, 11C). The low-grade coal 101 of the coal bunker 21 is dropped onto the crusher 23 by the coal feeder 22 and is crushed here to a predetermined size. Then, the crushed low-grade coal 101A is heated and dried by the fluidized bed drying device 12 to be dried coal 101B, and then cooled by the cooler 31 to be cooled dried coal 101B. It is stored.

The cooled dry coal 101 B stored in the dry coal bunker 34 is supplied to the coal gasifier 14 through the dry coal supply line 35 by the nitrogen supplied from the air separation device 42. In addition, the char 101C recovered by the char recovery device 15 described later is supplied to the coal gasifier 14 through the char return line 46 by the nitrogen supplied from the air separation device 42. Furthermore, after the compressed air 37 extracted from the gas turbine equipment 17 described later is boosted by the booster 68, it is supplied to the coal gasification furnace 14 through the compressed air supply line 41 together with oxygen supplied from the air separation device 42. .

In the coal gasifier 14, the supplied dry coal 101 B and the char 101 C are burned by the compressed air (oxygen) 37, and the dry coal 101 B and the char 101 C are gasified, thereby combustible gas mainly composed of carbon dioxide. (Coal gas) 200 can be produced. Then, the flammable 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 101C contained in the combustible gas 200 is separated. Then, the combustible gas 200A from which the char 101C is separated is sent to the gas purification device 16 through the gas discharge line 53. On the other hand, the fine particle char 101C separated from the flammable gas 200 is deposited in the feed hopper 52, is returned to the coal gasifier 14 through the char return line 46, and is recycled.

The combustible gas 200A from which the char 101C is separated by the char recovery device 15 is purified by the gas purification device 16 to remove impurities such as sulfur compounds and nitrogen compounds, and the fuel gas 200B is produced. Then, in the gas turbine equipment 17, when the compressor 61 generates the compressed air 40A and supplies it to the combustor 62, the combustor 62 supplies the compressed air 40A supplied from the compressor 61 and the gas purification device 16 The combustion gas 202 is generated by mixing with the fuel gas 200B to be produced, and the combustion gas 202 is generated, and the turbine 63 is driven by the combustion gas 202 to drive the generator 19 via the rotating shaft 64 to generate electric power. be able to.

Then, the exhaust gas 203 discharged from the turbine 63 in the gas turbine equipment 17 exchanges heat with the air 40 in the exhaust heat recovery boiler 20 to generate steam 204, and the generated steam 204 is used as a steam turbine equipment 18 Supply to In the steam turbine equipment 18, by driving the turbine 69 with the steam 204 supplied from the waste heat recovery boiler 20, 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 discharged from the chimney 75 to the atmosphere.

FIG. 2 is a schematic view of a low grade coal supply facility according to a first embodiment.
As shown in FIG. 2, the low-grade coal supply facility 11A according to the present embodiment is a fluidized bed that forms a drying chamber for drying the pulverized low-grade coal (brown coal) 101A having a high water content pulverized by the pulverizer 23. A heat transfer member (heating means) provided in the drying device 12 and the fluidized bed drying device 12 and supplying superheated steam (for example, steam at 150 ° C.) A to the inside of the tube to remove moisture in the pulverized low grade coal 101A ), A generated steam line 29 for discharging the generated steam 104 generated when the pulverized low grade coal 101A is dried by the heat transfer member 103 to the outside of the fluidized bed drying device 12, and the generated steam line 29 And a dust collector 30 such as a cyclone for removing dust in the generated steam 104, and a heat recovery system for recovering the heat of the generated steam 104 interposed downstream of the dust collector 30 in the generated steam line 29 06, in which and a cooler 31 for cooling the dried coal 101B withdrawn from the fluidized bed dryer 12.
In addition, the code | symbol 116 illustrates the straightening vane which rectifies | straightens the fluidization vapor | steam 107 which is fluidization gas.

In the low-grade coal supply facility 11A, the low-grade coal 101 is supplied to the crusher 23 by a supply hopper (not shown) and pulverized into a pulverized low-grade coal 101A. The pulverized low-grade coal 101A is introduced into the interior of the fluidized bed drying apparatus 12 from the inlet (not shown), and is fluidized by the fluidized steam 107 separately introduced into the fluidized bed drying apparatus 12 to form the fluidized bed 111.

The heat transfer member 103 is disposed in the fluidized bed 111. In the heat transfer member 103, for example, drying steam (superheated steam) A at 150 ° C. is supplied, and the low-grade coal 101A is indirectly crushed using the latent heat of the high temperature drying steam (superheated steam) A. I try to dry it. The drying steam (superheated steam) A used for drying is discharged to the outside of the fluid bed drying apparatus 12 as condensed water B at, for example, 150 ° C.

That is, since the drying vapor (superheated vapor) A condenses and becomes a liquid (moisture) on the inner surface of the heat transfer member 103 which is the heating means, the latent heat of condensation radiated at this time is dried in the pulverized low grade coal 101A. Is effectively used for heating. Any heat medium may be used as long as it is accompanied by a phase change, except for the high temperature drying steam (superheated steam) A. For example, fluorocarbon, pentane, ammonia and the like can be exemplified. In addition to using a heat medium as the heat transfer member 103, an electric heater may be installed.

The generated steam 104 generated when the pulverized low-grade coal 101A is dried by the heat transfer member 103 is generated from the freeboard portion F formed in the upper space of the fluidized bed 111 in the fluidized bed drying device 12. Thus, the fluid is discharged to the outside of the fluid bed drying device 12. Since the generated steam 104 contains the dried and finely pulverized lignite 101A, it is collected by, for example, the dust collector 30 and separated as the solid component 115.
The solid component 115 is joined to the dry coal supply line 35, mixed with the dry coal 101 B extracted from the fluidized bed drying device 12, cooled by the cooler 31, and then supplied to the coal gasifier 14.

On the other hand, since the generated steam 104 collected by the dust collector 30 is, for example, steam at 105 to 110 ° C., the heat is recovered by the heat recovery system 106 and then processed by the water treatment unit 112. The fluid is discharged to the outside of the fluidized bed drying device 12. The generated steam 104 collected by the dust collector 30 may be applied to, for example, a heat exchanger, a steam turbine, or the like to effectively use the heat.

In addition, a part of the generated steam 104 collected by the dust collection device 30 is sent into the fluidized bed drying device 12 by, for example, the circulation fan 109 interposed in the branch line 108, and the pulverized low-grade coal 101A Is used as fluidizing steam 107 that causes the fluid bed 111 to flow. In addition, although a part of generated steam 104 is reused as a fluidizing medium for fluidizing the fluid bed 111, the present invention is not limited to this, for example, nitrogen, carbon dioxide or low oxygen concentration containing these gases Air may be used.

Although the fluidized bed drying apparatus 12 described above exemplifies a tube-shaped heat transfer member as the heat transfer member 103 in the present embodiment, the present invention is not limited thereto. For example, a plate-shaped heat transfer member May be used.
Further, although the configuration has been described in which the drying steam (superheated steam) A is supplied to the heat transfer member 103 to indirectly dry the pulverized low grade coal 101A, the present invention is not limited to this, the fluidized bed 111 of the pulverized low grade coal 101A. Alternatively, the low-grade coal 101A may be directly dried by the fluidizing steam 107 flowing, or may be supplied with a fluidizing gas for heating and dried.

In the present embodiment, the drying and low-level operation is performed without installing the pulverized coal machine used in high-grade coal (high-grade coal) having a high calorific value such as bituminous coal and anthracite which are supplied to conventional gasifiers. Since the graded coal 101B is supplied as it is to the gasification furnace 14, equipment of the pulverizer and its utility cost can be reduced.

This is because HGI (Hard), which is an indicator of the crushability of coal, has a high water content (for example, 50 to 60%), such as subbituminous coal and lignite, used in the present invention (eg, 50 to 60%). As the Grove Index) index is high, the crushability is good.

Here, HGI refers to grinding a certain amount of coal for a predetermined time, and taking a weight ratio of a predetermined particle size or less as an index thereof. For this reason, it is said that the larger the number, the easier it is to be crushed coal. Normally, the HGI index is around 50, and the HGI index of 40 or less is considered to be hard, and conversely, the HGI index of 60 or more is determined to be fragile.

FIG. 6 is a diagram showing the relationship between various coals and the HGI index.
It can be seen from FIG. 6 that lignite, which is low-grade coal, has a high HGI index of 80 or more and is softer than low-grade coal, bituminous coal.
As a result, atomization of coarse particles due to friction and collision in the fluidized bed 111 can be achieved, and the ratio of atomization rate can be improved.

FIG. 7 is a view showing an example of the particle size distribution of dry coal.
The distribution of FIG. 7 is a relationship diagram between the weight ratio on the sieve and the mesh (μm) when the brown coal A of FIG. 6 is dried by the fluidized bed drying device 12 using the pulverized material of 5 mm or less.
As shown in FIG. 7, when dried by the fluid bed drying device 12, it was found that the particle size distribution had a width having a peak at around 1000 μm.

The particle size of the pulverized low-grade coal 101A depends on the degree of pulverization of the grinder 23, but for example, 10 mm or less, preferably 5 mm or less is good for drying on the downstream side with the drying device and The transport is good and preferred.
Here, the target particle size range at the time of pulverization in the pulverizer 23 is about 2 mm or less, but the present invention is not limited to this.

Although the degree of drying in the fluidized bed drying device 12 varies depending on the water content of the pulverized low-grade coal 101A supplied, the degree of drying is preferably 15% or less, more preferably 10% or less. This is because when the dry state is good, the transportability is improved and the energy loss in gasification is reduced.

From FIG. 6 and FIG. 7, although low-grade coal, lignite has a high water content, it is softer because it has a higher HGI than high-grade coal. And since it is fluidized while removing water by drying in the fluidized bed dryer 12, the ratio of the mesh diameter 2000 μm or less is large, and the low-grade coal is easily gasified, along with the property that the gasification furnace is as it is The dry coal 101B has the characteristic of being easily gasified.
Therefore, in the low grade coal supply facility 11A, it is possible to dispense with the pulverizing treatment with a crusher such as coal as in the prior art. As a result, the installation of the pulverized coal machine becomes unnecessary, and the equipment to be supplied to the gasification combined cycle power generation system can be made compact.

Moreover, it is preferable to set the superficial velocity in the gasification furnace 14 as the superficial velocity in which the dried and cooled cooled dry coal 101B supplied directly into the furnace does not fall. Thereby, favorable gasification of dry charcoal 101B is attained.

FIG. 3 is a schematic configuration diagram of a combined gasification combined cycle power generation system using low grade coal having a low grade coal supply facility according to a second embodiment. The members having the same functions as those of the above-described embodiment are denoted by the same reference numerals, and the detailed description thereof is omitted.

In Example 2, as shown in FIG. 3, the integrated coal gasification combined cycle facility 10 B includes the dry coal 101 B in the fluidized bed drying device 12, dry coal (fine particles) 101 B _{F (FINE)} and dry coal (coarse particles) It is separated into 101B _{R (ROUGH)} . Then, only the separated dried coal (fine particles) 101 B _F is supplied to the coal gasifier 14 through the dried coal supply line 35. Then, coarse particles 101B _R of dry coal 101B are supplied to a separately provided combustion furnace 80 and burned.

FIG. 4: is the schematic of the low grade coal supply installation which concerns on a present Example. The members having the same functions as those of the above-described embodiment are denoted by the same reference numerals, and the detailed description thereof is omitted.
As shown in FIG. 4, the fluidized bed drying apparatus 12 according to the low grade coal supply facility 11B according to the present embodiment is a low grade coal 101A pulverized from the crusher 23 at one end side of the fluidized bed drying apparatus 12. And a branch line 108 for forming the fluidized bed 111 together with the low grade coal by supplying the fluidized steam 107 which is a fluidizing gas to the lower part of the fluidized bed drying chamber; Heat transfer member 103, which is a heating unit for heating the low-grade coal 101A supplied into the fluidized bed 111, and the generated steam line 29 for discharging the fluidizing gas and the generated steam 104 from the upper side of the bed dryer 12. When a fine dry coal discharge line 121 for discharging the dried coal 101B _F of fine heated drying from the upper vicinity of the low-grade coal input line 120 and different side of the fluidized bed 111, the low-grade Sumito It will be provided with coarse dry coal discharge line 122 for discharging the dried coal 101B _R heating dry coarse from the vicinity of the bottom of the line 120 with different side of the fluidized bed 111, and is discharged from the fine dry coal discharge line 121 Fine-grained dry coal 101 B _F is supplied to the gasification furnace 14 through the dry coal supply line 35.

In this embodiment, fine particle drying for discharging fine dry carbon 101 B _F using the property of distribution of deviation between fine dry carbon 101 B _F and coarse dry carbon 101 B _R formed in the fluidized bed 111 a coal discharge line 121, and a coarse dry coal discharge line 122 for discharging the dried coal 101B _R coarse grains, and by providing on the layer upper the layer bottom of the fluidized bed 111, separate the coarse particles and fine particles discharged can do.
Thereby, the dispersion of the particle size supplied to the coal gasifier 14 can be suppressed.
Moreover, also when installing a pulverized coal machine on the downstream side, the equipment capacity of a downstream process can be reduced by supplying only coarse particles.

In the present invention, the type of coal is not particularly limited, and high-grade coal (high-grade coal) having a high calorific value such as bituminous coal and anthracite coal, such as high moisture content such as subbituminous coal and brown coal Any of low grade coal (low grade coal or high moisture coal) can be applied (eg, 50 to 60%).

When high-grade coal (high-grade coal) with high calorific value such as bituminous coal or anthracite is applied to the spouted bed gasifier, a pulverizer is installed without using a coarse crusher / dryer. However, for example, in the case of low-grade coal (low grade coal or high moisture coal) such as subbituminous coal and lignite having a high water content (for example, 50 to 60%), install a coarse crusher and a dryer. Since the coal 101B crushed and dried by the equipment can be supplied as it is to the coal gasifier 14, the equipment of the pulverizer and its utility cost can be reduced.

The fine particles 101B _F discharged from the fine particle dried carbon discharge line 121 are cooled by the cooler 31 and only the cooled dried coal (fine particles) 101B _F is supplied through the dry carbon supply line 35. As a result, while maintaining the conventional gasification efficiency, it is possible to omit a pulverizing coal machine for pulverizing high-grade coal such as conventional bituminous coal, thereby reducing the cost.

On the other hand, dry charcoal (coarse particles) 101B _R is supplied to the separately installed combustion furnace 80 shown in FIG. 3 (* 1), and is burned here to recover heat.

Here, the classification of the particle size of the fine particles and the coarse particles may be appropriately changed according to the scale of the gasification furnace 14 and the superficial velocity, etc. However, according to the particle size distribution shown in FIG. Although the following thing can be made into a fine particle, it is not limited to this.
Here, when the particle size distribution is separated, it is preferable to set the fine particles to 500 to 1000 μm or less and the coarse particles to 500 to 1000 μm or more, but the present invention is not limited to this.

In the present embodiment, since dry carbon (fine particles) 101B _F is introduced into the gasification furnace 14, the gasification efficiency in the gasification furnace 14 is improved, and the transportability is also improved.

FIG. 5: is the schematic of the low grade coal supply installation which concerns on a present Example. The members having the same functions as those of the above-described embodiment are denoted by the same reference numerals, and the detailed description thereof is omitted.

As shown in FIG. 5, the low-grade coal supply facility 11C according to the present embodiment is the same as the third embodiment, and the dry coal 101B is dry coal (fine particles) 101B _{F (FINE)} and dry coal (coarse particles) 101B _{R ( ROUGH)} and separated dry coal (coarse particles) 101B _R is used as one or both of the inlet side of the fluidized bed drying device 12 and the upstream side of the crusher 23 in the coarse dry carbon circulation line 123 I'm trying to get back through.
In this case, a classifier for classifying coarse particles is provided in the coarse-grain dry carbon circulation line 123, and large particles having a predetermined particle size or more are returned to the upstream side of the crusher 23, and are crushed again by the crusher 23. In this way, the overall crushing efficiency is further improved, and the drying efficiency is also improved.

In each of the above-described embodiments, low-grade coal is used as the wet raw material, but even high-grade coal is applicable, and it is not limited to coal, but is used as an organic resource derived from renewable organisms. It is also possible to use, for example, thinned timber, waste wood, driftwood, grasses, waste, sludge, tires, and recycled fuel (pellets or chips) made from these, etc. .

10A, 10B Integrated coal gasification combined cycle power plant 11 Low grade coal supply equipment 12 Fluid bed drying equipment 14 Coal gasification furnace 15 Char recovery equipment 16 Gas purification equipment 17 Gas turbine equipment 18 Steam turbine equipment 19 Generator 20 Exhaust heat recovery boiler 101 Low-grade coal 101A Pulverized low-grade coal (pulverized coal)
101B dry low grade coal (dry coal)
103 Heat transfer member (heating means)
104 Steam A Drying steam (superheated steam)
B condensed water

Claims

A grinder for grinding the wet raw material supplied by the raw material supply means;
A drying device for drying the crushed wet material;
A dry raw material supply line for supplying a dry raw material dried by the drying device to a gasification furnace;
Wet raw material supply equipment characterized by having.
In claim 1,
A wet raw material supply facility characterized by comprising a dry raw material supply line for supplying fine particles dried and separated by the drying device to a gasification furnace.
In claim 1 or 2,
A wet raw material supply facility characterized by comprising a combustion furnace which burns coarse particles dried by the drying device.
In any one of claims 1 to 3,
A wet raw material supply facility characterized by comprising a recirculation line for supplying coarse particles dried by the drying device to either or both of the upstream side of the crusher and the inlet of the drying device.
In any one of claims 1 to 4,
A wet raw material supply facility characterized in that the superficial velocity in the gasification furnace is a superficial velocity at which dried dry feedstock does not fall.
In claim 1,
The drying device is a fluid bed drying device having a fluid bed drying chamber for drying the wet material,
A wet material feeding line for feeding the wet material pulverized from the crusher to one end of the fluidized bed drying apparatus;
A fluidizing gas supply line that forms a fluid bed with the wet material by supplying fluidizing gas to the lower part of the fluid bed drying chamber;
A gas discharge line for discharging fluidizing gas and generated steam from above the fluidized bed drying device;
A heating unit that heats the pulverized wet raw material supplied into the fluidized bed;
A particulate dry raw material discharge line which discharges a dry particulate dry material which has been heated and dried from the vicinity of the upper part of the fluidized bed different from the wet raw material feed line;
And a coarse-grained dry material discharge line for discharging the coarse-grained dry material that has been heated and dried from the vicinity of the bottom of the fluid bed on the side different from the wet-material charging line.
A wet raw material supply facility characterized in that the dry raw material of fine particles discharged from the fine particle dry raw material discharge line is supplied to the gasification furnace side by the dry raw material supply line.
In claim 6,
What is claimed is: 1. A wet raw material supply facility characterized by comprising a coarse-grained dry material circulation line for supplying separated coarse-grained dry material into the fluidized bed drying chamber from the vicinity of the wet material feed line.
The wet raw material supply facility according to any one of claims 1 to 7.
A gasification furnace that processes dried dry raw material supplied from the wet raw material supply facility and converts it into gasified gas;
A gas turbine (GT) operated using the gasified gas as a fuel;
A steam turbine (ST) operated by steam generated by a waste heat recovery boiler for introducing turbine exhaust gas from the gas turbine;
An integrated gasification combined cycle system using a wet raw material, comprising: a generator (G) connected to the gas turbine and / or the steam turbine.