JP2014173789A - 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 include: a raw coal flow layer banker 102 which accumulates low-grade raw coal 101 temporarily in a flowing state; an impact type pulverizer 103 which pulverizes raw coal coarse particles 101b of, for example, 1 mm or larger extracted from a lower side of the raw coal flow layer banker 102; an air current transfer line Lwhich transfers the impact-pulverized fine coal 101c from the impact type pulverizer 103 with an air current; a flow layer drier 106 which includes a drying chamber for drying the pulverized fine coal 101c and dries the raw coal fine particles 101a and fine coal 101c, supplied to the drying chamber with fluidizing gas, in a flowing state; and a cooler 110 which cools the dry coal 101d having been dried by the flow layer drier 106.

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 moisture brought in is large, and this moisture reduces power generation efficiency. In the case of low-grade coal, the low-grade coal is dried by the above-mentioned drying device to remove moisture and further pulverized. 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 An impact pulverizer that finely pulverizes coarse particles, an airflow conveyance line that conveys impact-pulverized pulverized coal by airflow from the impact-type pulverizer, and a carrier gas from raw coal fine particles introduced from the raw coal fine particle extraction line And a drying chamber for drying pulverized coal supplied from an air flow transfer line and raw coal fine particles from which the carrier gas is separated by the separator, and the raw material supplied to the drying chamber by fluidized gas Flowing coal fines and pulverized coal While a fluidized bed dryer for drying, in the fluidized bed dryer at a dry dry coal, characterized by comprising: a cooler for cooling the low-grade coal drying installation.

  A second invention is the low-grade coal drying facility according to the first invention, wherein the cooler is a cooling and storage bin for storing dry coal.

  According to a third aspect of the present invention, there is provided a low-grade coal drying facility according to the first aspect, further comprising a drying combined storage bin for further fluidly drying the dry coal between the fluidized bed drying device and the cooler. is there.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, a dust removal and storage bin is provided between the fluidized bed drying device and the cooler to separate and store the carrier gas and dust from the dry coal. Located in low-grade coal drying equipment.

  A fifth aspect of the invention is a low-grade coal drying facility according to any one of the first to fourth aspects of the invention, and a coal gasification furnace that processes dry coal supplied from the fluidized bed drying device and converts it into gasification gas. A gas turbine (GT) operated with the gasified gas as fuel, a steam turbine (ST) operated with steam generated by an exhaust heat recovery boiler that introduces turbine exhaust gas from the gas turbine, and the gas turbine And / or a generator (G) connected to the steam 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, it is pulverized into pulverized coal with an impact-type pulverizer such as a cage mill and secondarily dried. And since pulverized coal is sent to a fluidized-bed drying apparatus and fluidized-bed drying is performed here, and the tertiary drying of finishing is carried out, the drying equipment of a 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 diagram of the low-grade coal drying facility according to the second embodiment. FIG. 3 is a schematic diagram of the low-grade coal drying facility according to the third embodiment. FIG. 4 is a schematic diagram of the low-grade coal drying facility according to the fourth embodiment. FIG. 5 is a schematic configuration diagram of a combined gasification combined power generation system according to a fifth 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 view of a low-grade coal drying facility according to the first embodiment.
As shown in FIG. 1, the low-grade coal drying facility 100A according to the first embodiment includes a raw coal fluidized bed bunker 102 that temporarily stores low grade coking coal 101 while flowing, and the raw coal fluidized bed bunker 102. of withdrawing from the upper side for example, 1mm or less of the original coal fine 101a, the raw coal fine withdrawal line L _1, extract the raw coal grit 101b from the lower side e.g. 1mm or more of the raw coal fluidized bed bunker 102, Harasumiara A grain extraction line L ₂ , an impact pulverizer 103 for finely pulverizing the raw coal coarse grains 101 b introduced from the raw coal coarse grain extraction line L _2, and an impact-pulverized (less than 1 mm) pulverized coal 101 c , impact crusher 103 and pneumatic conveying line L ₃ to pneumatic conveying, and separator 104 to separate the carrier gas from the raw coal fine 101a introduced from raw coal fine withdrawal line L _1, the separator Has a drying chamber where carrier gas to dry the pulverized coal 101c supplied from the separated raw coal fine 101a and pneumatic conveying line L ₃ Metropolitan at 104, is supplied to the drying chamber by the flow of gas the raw coal fine 101a and A fluidized bed drying device 106 that dries pulverized coal 101c while flowing, and a cooler 110 that cools dry coal 101d dried by the fluidized bed drying device 106 are provided.

As shown in FIG. 1, the raw coal fluidized bed bunker 102 is provided on the upstream side of the impact pulverizer 103, and pre-drys the low-grade coal of the raw coal 101 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. Since the separated raw coal fine particles 101a are fine powder, they are directly supplied to the fluidized bed drying apparatus 106 via the supply line L ₄ .

Here, as the fluidizing gas 122 supplied from the rectifying plate 121 into the raw coal fluidized bed bunker 102, for example, nitrogen, air, or cooling exhaust gas at the time of cooling dry coal is used.
A heating means 102a for heating the fluidized bed is also provided.

  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 from above to 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 the separator 104, the exhaust gas 130 is separated and the raw coal fine particles 101 a are introduced into the fluidized bed drying device 106.
The dust 132 and the exhaust gas 130 separated by the separator 104 are sent to a dust removal facility 131, where the dust 132 is separated, the condensed water 134 is separated by a condenser 133, and the separated condensed water 134 is separated by a wastewater treatment facility. It is processed separately.
Further, the exhaust gas 135 separated by the condenser 133 is reused as the fluidized gas 122 of the raw coal fluidized bed bunker 102 (* 2).

Further, dust 132 separated in dust equipment 131 is sent to the storage bin 107a (described later) by the dust supply line L _11.

  In addition, since the raw coal coarse particles 101b are put into the impact pulverizer 103 after the foreign matter 123 is removed, extra crushing in the impact pulverizer 103 is not necessary. As a result, the power of the impact pulverizer 103 can be reduced.

  In addition, since the large foreign matter 123 is removed in advance, trouble in the impact pulverizer 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 which was withdrawn in the original Sumiara particle withdrawal line L _2, for example by an impact pulverizer 103 such as cage mill or a hammer mill, a predetermined particle size (e.g., 1mm) is ground to below, together with the carrier gas, It is supplied from the upper part of the drying chamber of the fluidized bed drying apparatus 106.

  The impact pulverizer 103 is supplied with direct heating steam (gas) 103a for directly heating the raw coal coarse particles 101b. The heating steam 103a contributes to secondary drying during pulverization and also serves as a carrier gas for the pulverized coal 101c.

  Here, the predetermined particle size when pulverizing with the impact pulverizer 103 is the maximum particle size allowed as gasified fuel in the coal gasification furnace 14 and is appropriately changed by the coal gasification furnace 14. .

Here, the impact-type pulverizer 103 that crushes the raw coal coarse particles 101b is a pulverized coal 101c of 1 mm or less by impact pulverization using, for example, a cage mill or a hammer mill.
The illustrated cage mill is, for example, an impact pulverizer having a structure in which two large and small ridges in which a large number of metal rods are arranged in a circle are overlapped on a concentric shaft and rotated at high speed in the opposite direction ( For example, a “cage mill” manufactured by Furukawa Industrial Systems Co., Ltd. can be exemplified.

  Then, the pulverized coal 101c pulverized by the impact pulverizer 103 such as a cage mill is sent to the fluidized bed drying device 106 where final tertiary drying is performed.

Here, a gas discharge line L ₅ provided above the drying chamber of the fluidized bed drying apparatus 106 is provided with a dust removal equipment 141 such as a cyclone for removing dust in the generated steam 106 a and a downstream side of the dust removal equipment 141. In addition, a latent heat recovery facility 142 such as a compressor for recovering the heat of the generated steam 106a is provided.

  The drying chamber of the fluidized bed drying apparatus 106 is fluidized by fluidized steam 106c introduced from the pores of the rectifying plate 106b to form a fluidized bed 106d.

  The heat transfer member 106e is disposed in the fluidized bed 106d. For example, 150 ° C. drying steam (superheated steam) A is supplied into the heat transfer member 106e, and the pulverized coal 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 106 as condensed water B at 150 ° C., for example.

  That is, since the drying steam (superheated steam) A condenses into liquid (moisture) on the inner surface of the heat transfer member 106e as the heating means, the condensed latent heat radiated at this time is used to heat the drying of the pulverized coal 101c. 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 106e, an electric heater may be installed. The condensed water B generated by drying is used as heating means 102a for heating the fluidized bed of the raw coal fluidized bed bunker 102 (* 1).

Generating steam 106a that is generated when the pulverized coal 101c is dried by the heat transfer member 106e is fluidized in the fluidized bed dryer 106, the gas discharge line L ₅ from the free board F which is formed in the upper space of the fluidized layer 106d It is discharged to the outside of the layer drying device 106. Since this generated steam 106a contains dried and pulverized powder, for example, dust is removed by the dust removing equipment 141 and separated as dry fine powder 106f.
This dry fine powder 106f is merged with the pulverized coal 101c from the impact type pulverizer 103, and is put into the fluidized bed drying apparatus 106 again.

Dry coal 101d from the fluidized bed dryer 106 is withdrawn from the dry coal discharge line L ₆ is cooled by the cooler 110, cooling dry coal 101e is stored bins 107a for storing the cooling dry coal 101e, the cooling dry coal 101e The gas is supplied to the coal gasifier 14 (see FIG. 5 described later) through a bin system 107 such as a pressure bottle 107 b that is pressurized and supplied to the coal gasifier 14 and a dry coal supply line L ₈ . The drying fines 106f may be merged to dry coal 101d that extracted from dry coal discharge line L _6.
Cooling gas such as nitrogen or air, cooling water, and the like are supplied to the cooler 110 to cool the dry coal 101d directly or indirectly.

On the other hand, the generated steam 106a after being dust-removed by the dust removal equipment 141 is, for example, steam at 105 to 110 ° C., so that heat is recovered by the latent heat recovery equipment 142 and then processed by the water treatment section. The obtained cooling water contributes to cooling by the cooler 110.
The recovered heating steam is used as the heating steam 103a of the impact pulverizer 103 (* 3).

Moreover, removal part of the steam generated 106a after being dust removal by the dust equipment 141 is sent to the fluidized bed dryer 106 by interposed fluidizing gas supply line L ₇ the example circulation fan (not shown) It is used as fluidized steam 106c that causes fluidized bed 106d of pulverized coal 101c to flow (* ₂ ). In the present embodiment, as the fluidizing medium for fluidizing the fluidized bed 106d, a part of the generated steam 106a is reused, but 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 106e 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 vapor | steam for drying (superheated steam) A to the heat-transfer member 106e and dries the pulverized coal 101c indirectly was demonstrated, it is not restricted to this, The flow which flows the fluidized bed 106d of the pulverized coal 101c A configuration in which the pulverized coal 101c is directly dried by the chemical vapor 106c, or a configuration in which a fluidizing gas for heating is supplied and dried may be employed.

According to the low-grade coal drying facility 100A of the present embodiment, first, the raw coal coarse particles 101b are separated while the raw coal fluidized bed bunker 102 pre-drys the raw coal 101 of the low-grade coal, and the separated raw coal coarse particles are separated. 101b is made into pulverized coal 101c of 1 mm or less using, for example, a cage mill which is an impact pulverizer 103.
Then, the pulverized pulverized coal 101c is supplied to the fluidized bed drying device 106, where the moisture is dried to 10% or less.
Depending on the situation, the pulverized coal 101c may be returned to the inlet side of the cage mill once and further pulverized, and then supplied to the fluidized bed drying apparatus 106.

  In the cage mill which is the impact type pulverizer 103, for example, by heating the steam 103a for heating inside the cage tube, the secondary drying of the wet raw material which is high moisture coal is performed together with the pulverization.

Dry coal 101d from the outlet of the fluidized bed dryer 106 is withdrawn from the dry coal discharge line L _6, since the particle diameter is 1mm or less, it is possible to omit an expensive vertical mill which has been conventionally used, bin Dry coal 101d can be conveyed directly to the IGCC plant via the system 107.
In addition, since the vertical mill has a limited amount of pulverization, it is necessary to use a plurality of vertical mills. However, for example, a cage mill requires only one unit, so that the cost of the equipment can be reduced. In addition, the vertical mill uses a pulverizer-type crusher to classify the particle size by wind power, so in the case of coal that has a lot of foreign matter (minerals and woody components) and is difficult to pulverize, such as brown coal, There is a problem in that particles accumulate on the surface and cause equipment damage.
On the other hand, in the cage mill, since the lignite that has been thrown in due to gravity drop is extracted by gravity and centrifugal force, there is an advantage that even if foreign matters such as large lumps are mixed, the risk of blockage is low and it is difficult to cause equipment damage. .

  Here, the dry charcoal 101d discharged from the fluidized bed drying device 106 is transported to the bin system 107 of the bin IGCC by a mechanical transport facility such as a conveyor, or transported to the bin system 107 by airflow transport. Good.

  By pulverizing the raw coal coarse particles 101b with the impact pulverizer 103, an expensive vertical mill can be omitted, and the entire IGCC gasification system using high moisture coal can be simplified.

  In addition, by using the impact pulverizer 103 to make fine powder, the flow rate of the fluidizing gas can be reduced, and the size of the incidental equipment (for example, a fluidizing gas pushing fan or dust removing equipment) can be reduced.

  Furthermore, primary drying of the raw coal 101 is performed with the raw coal fluidized bed bunker 102, secondary drying is performed with the cage mill, and then tertiary drying is performed with the fluidized bed drying device 106, thereby dispersing the drying capacity of the drying device. It is possible to reduce the size of the main body of the drying apparatus and reduce the size of the incidental equipment, leading to cost reduction.

FIG. 2 is a schematic diagram of the low-grade coal drying facility according to the second embodiment. In addition, the same code | symbol is attached | subjected to the member which overlaps with the structure of the low grade coal drying equipment which concerns on Example 1 of FIG. 1, and the description is abbreviate | omitted.
As shown in FIG. 2, the low-grade coal drying equipment 100B according to the present embodiment includes a cooling and storage bin 111 having a cooling function instead of installing the cooler 110 according to the first embodiment alone. .

  The main body of the cooling and storage bin 111 is fluidized by a fluidizing gas 111b introduced from the pores of the rectifying plate 111a to form a fluidized bed 111c.

  The heat transfer member 111d is disposed in the fluidized bed 111c. For example, cooling water is supplied into the heat transfer member 111d to indirectly cool the dry charcoal 101d.

Generating steam 111e of dry coal 101d is generated when it is drying, the gas discharge line L ₁₀ from the free board F which is formed in the upper space is discharged to the outside of the cooling shared storage bin 111. Since the generated steam 111e contains dried and pulverized powder, the generated steam 111e is separated as dust 132 by dust removal equipment 131, for example. Dust 132 separated is supplied to the cooling shared storage bin 111 by dust supply line L _11.

By using the cooling / storage bin 111, installation of an independent cooler can be omitted.
In addition, since the cooling and storage bin 111 can be installed above the pressurizing bin 107b, the bin system can be made compact.

Here, the bottom part of the storage bin 107a as shown in FIG. 1 generally used is inclined to ensure a repose angle equal to or greater than the repose angle of the powder (coal). Since the risk of clogging / adhering the pulverized coal 101c is reduced, the bottom can be made flat.
For this reason, unlike the conventional storage bin 107a that secures an angle of repose or more, it contributes to a reduction in the height of the entire pulverized coal supply system that combines the fluidized bed cooling and storage bin 111 and the pressure bin 107b, and the device configuration Can be made compact.

FIG. 3 is a schematic diagram of the low-grade coal drying facility according to the third embodiment. In addition, the same code | symbol is attached | subjected to the member which overlaps with the structure of the low grade coal drying equipment which concerns on Example 1 of FIG. 1, and the description is abbreviate | omitted.
As shown in FIG. 3, the low-grade coal drying equipment 100 </ b> C according to the present embodiment includes a drying / storage bin 112 having a drying function on the upstream side of the cooler 110 according to the first embodiment.
By performing the fourth-order refinish drying in the drying / storage reservoir 112, the dry charcoal 101d having a lower moisture content than that of the first embodiment can be obtained.

  The main body of the drying / storage bin 112 of this embodiment is fluidized by the fluidizing gas 112b introduced from the pores of the rectifying plate 112a to form a fluidized bed 112c.

  The heat transfer member 112d is disposed in the fluidized bed 112c. For example, 150 ° C. drying steam (superheated steam) A is supplied into the heat transfer member 112d, 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 to the outside of the drying / storage bottle 112 as, for example, condensed water B at 150 ° C.

Generating steam 112e generated when charcoal 101c is dried by the heat transfer member 112d is dried, the dried combined storage bin 112, the gas discharge line L ₁₀ from the free board F which is formed in the upper space of the fluidized layer 112c It is discharged to the outside of the combined storage bin 112. Since the generated steam 112e includes dried and pulverized powder, the dust is removed by the dust removing equipment 131 and separated as dust 132, for example. Dust 132 separated is supplied to the drying combined storage bin 112 by dust supply line L _11.

  Here, in the present embodiment, the cooling and storage bin 112 has a flat shape, but may be a general hopper type.

  In the case of a flat shape, the bin system can be made compact as in the second embodiment.

FIG. 4 is a schematic diagram of the low-grade coal drying facility according to the fourth embodiment. In addition, the same code | symbol is attached | subjected to the member which overlaps with the structure of the low grade coal drying equipment which concerns on Example 1 of FIG. 1, and the description is abbreviate | omitted.
As shown in FIG. 4, the low-grade coal drying facility equipment 100 </ b> D according to the present embodiment includes a dust removal and storage bin 143 having a dust removal function on the upstream side of the cooler 110 of the first embodiment.
The dust removal and storage bin 143 separates and stores carrier gas and dust from the dry charcoal 101d.

By using the storage bin 107a as a storage bin for the drying apparatus, for example, having an electric dust collection function, it is possible to unify dust removal equipment.
As a dust removal facility, the storage bin that is also used as an electric dust collector is made into a hopper form and is equipped with storage, dust removal, and drying functions to simplify the entire system.

  FIG. 5 is a schematic configuration diagram of a combined gasification combined power generation system using coal according to the fifth embodiment.

  The gasification combined power generation system (IGCC: Integrated Coal Gasification Combined Cycle) using coal of Example 5 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. 5, the coal gasification combined power generation facility 10 pulverizes the raw coal fluidized bed bunker 102 that pre-drys the low-grade coal that is the raw coal 101 and the raw coal coarse particles 101b. A low-grade coal drying facility 100A comprising a shock bed pulverizer 103, a fluidized bed drying apparatus 106 for tertiary drying the pulverized coal 101c finely pulverized by the impact pulverizer 103, and a cooler 110, and a cooling coal 101e. To recover the char 101F in the combustible gas (product gas, coal gas) 200, which is a gasification gas, and the coal gasification furnace 14 for generating the combustible gas (product gas, coal gas) 200 Char recovery device 15, gas purification device 16 for purifying combustible gas (product gas, coal gas) 200A, and gas turbine equipment for driving the turbine by burning the purified fuel gas 200B 7, a steam turbine (ST) facility 18 operated by steam generated by a heat recovery steam generator (HRSG) 20 that introduces turbine exhaust gas from the gas turbine facility 17, a gas turbine facility 17 and / or Or the generator (G) 19 connected with the steam turbine equipment 18 is comprised.

  The low-grade coal drying facility 100 according to this embodiment includes a primary drying raw coal fluidized bed bunker 102, a secondary drying impact pulverizer 103, and a tertiary drying fluidized bed drying apparatus 106. . 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 an impact pulverizer 103 to form pulverized coal 101c.

  The dry charcoal 101d subjected to the tertiary drying by the fluidized bed drying apparatus 106 is cooled by the cooler 110, and the cooled charcoal 101e is supplied to the coal gasifier 14 through the pressure bottle 107b.

  The coal gasification furnace 14 can supply fine cooling coal 101e, and char (unburned coal) 101F recovered by the char recovery device 15 can be returned and 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 the cooling charcoal 101e and the char 101F, and oxygen (O ₂ ) is used as an oxidant.

The coal gasification furnace 14 is, for example, a spouted bed type gasification furnace, which combusts and gasifies cooling charcoal 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 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 action | operation of the coal gasification combined cycle power generation equipment 10 of Example 5 is demonstrated.

  In the coal gasification combined power generation facility 10 of the fifth embodiment, in the low-grade coal drying facility 100A, 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 impact pulverizer 103, where they are crushed to a predetermined size. The crushed pulverized coal 101c is then sent to the fluidized bed drying device 106, where it is finish-heated and dried, cooled by the cooler 110, and stored in the storage bin 107a.

Storing cooling charcoal 101e via a pressure bottle 107 b, it is supplied by the nitrogen supplied from the air separation unit 42 through the cooling coal supply line L ₈ to the coal gasifier 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 cooling coal 101e and char 101F are combusted by the compressed air (oxygen) 37, and the cooling coal 101e and char 101F are gasified, so that the combustibility is mainly composed of carbon monoxide. A gas (coal gas) 200 can be generated. The combustible gas 200 is discharged from the coal gasifier 14 through the gas generation line 49 and sent to the char recovery device 15.

  In the char recovery device 15, the combustible gas 200 is first supplied to the dust collector 51, whereby the char 101 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 101e Cooled coal 102 Raw coal fluidized bed bunker 103 Impact type pulverizer 104 Separator 106 Fluidized bed dryer 107 Bin system 110 Cooler

Claims (5)

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;
An impact 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 impact-pulverized pulverized coal from the impact-type pulverizer;
A separator for separating the carrier gas from the raw coal fine particles introduced from the raw coal fine particle extraction line;
It has a drying chamber that dries the raw coal fine particles separated from the carrier gas by the separator and the pulverized coal supplied from the air current conveying line, and flows the raw coal fine particles and pulverized coal supplied to the drying chamber by the fluidizing gas A fluidized bed drying device for drying while
A cooler for cooling dry charcoal dried by the fluidized bed dryer;
A low-grade coal drying facility characterized by comprising: In claim 1,
The low-grade coal drying facility, wherein the cooler is a cooling and storage bin that stores dry coal. In claim 1,
A low-grade coal drying facility comprising a drying and storage tank for further fluidly drying dry coal between the fluidized bed dryer and the cooler. In claim 1,
A low-grade coal drying facility having a dust removal and storage bin for separating and storing carrier gas and dust from dry coal between the fluidized bed drying device and the cooler. Low-grade coal drying equipment according to any one of claims 1 to 4,
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 comprising the generator (G) connected to the gas turbine and / or the steam turbine.

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