JP4468283B2 - Coal gasification combined power generation facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide coal gasification combined power generation facilities capable of improving power generation efficiency at low manufacturing cost and low operation cost. <P>SOLUTION: The facilities are provided with a coal gasification furnace 5 processing powdered coal and converting the same to gas fuel, gas turbine facilities 9 operated with using gas fuel as fuel, steam turbine facilities 11 operated by steam generated by a exhaust heat collecting boiler 13 introducing combustion exhaust gas of the gas turbine facilities therein, a power generator G connected to the gas turbine facilities 9 and/or the steam turbine facilities 11, flue gas desulfurizing facilities 15 desulfurising combustion exhaust gas discharged from the exhaust heat collecting boiler 13, and a coal supply device 3 supplying the coal gasification furnace 5 with powdered coal as slurry. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an integrated coal gasification combined cycle (IGCC) used for gas turbine combined power generation by converting solid fuel coal into coal gasification gas by a coal gasification furnace.

  Coal gasification combined power generation facilities use abundant reserves of coal resources, have higher thermal efficiency than conventional pulverized coal thermal power generation, emit less air pollutants such as carbon dioxide, Ashes are discharged as vitreous molten slag, and the volume is reduced. Therefore, the coal gasification combined power generation facility is being developed as a technology that will become the main power of future coal thermal power generation.

For supplying pulverized coal to a coal gasification furnace in a coal gasification combined power generation facility, as shown in Patent Document 1 or Patent Document 4, a wet coal supply system in which pulverized coal and water are mixed and supplied as a slurry, As shown in Patent Document 2 or Patent Document 3, there is a dry coal supply system in which pulverized coal is pressurized and supplied with a pressurized gas such as air or nitrogen in a dry state.
In the wet coal supply method, heat (evaporation latent heat) for evaporating the water contained in the slurry is required in the coal gasification furnace, so that this latent heat of evaporation becomes a heat loss and the efficiency is lowered. .
For this reason, it is the actual situation that the dry coal supply system was frequently used. However, in the dry coal supply system, there is a problem that the equipment becomes complicated and the manufacturing cost increases, for example, a lock hopper system is required to pressurize dry pulverized coal.
For this reason, the wet coal supply system has been reviewed from the viewpoint of manufacturing cost.

JP-A-5-280373 (paragraphs [0005] to [0011] and FIG. 3) JP 2002-250206 A (paragraphs [0010] to [0012] and FIG. 1) Japanese Patent No. 2733188 (paragraphs [0014] to [0026] and FIG. 1) Japanese Patent Laid-Open No. 10-266871 (paragraphs [0005] to [0011] and FIG. 1)

By the way, in a coal gasification combined power generation facility, gas purification is usually performed before gaseous fuel generated in a coal gasification furnace is supplied to a gas turbine. Gas purification includes wet gas purification as shown in Patent Document 1 or Patent Document 2 and dry gas purification as shown in Patent Document 4.
However, when wet gas purification is used, when combined with wet coal supply (Patent Document 1), steam generated from moisture in the slurry charged into the gasifier is condensed and removed by the gas purification equipment, resulting in heat loss. However, there is a problem that the power generation efficiency is greatly reduced.
On the other hand, when dry gas refining is used, when combined with wet coal supply, the steam contained in the gaseous fuel is introduced into the gas turbine without condensing on the way and expands, so there is not much heat loss. However, since the expanded water is discharged from the chimney and cannot be recovered, there is a problem that a large amount of water needs to be replenished from the outside in order to produce the slurry, resulting in high operating costs.

  In view of the above problems, an object of the present invention is to provide a combined coal gasification combined power generation facility that is low in manufacturing cost and operation cost and that can improve power generation efficiency.

In order to solve the above problems, the present invention employs the following means.
That is, the combined coal gasification combined power generation facility according to the present invention includes a coal gasification furnace that processes pulverized coal and converts it into gaseous fuel, a gas turbine facility that is operated using the gaseous fuel as fuel, and a gas turbine facility. Steam turbine equipment operated by steam generated in the exhaust heat recovery boiler that introduces combustion exhaust gas, the gas turbine equipment and / or the generator connected to the steam turbine equipment, and exhaust gas from the exhaust heat recovery boiler A flue gas desulfurization facility that desulfurizes the combustion exhaust gas, and a coal supply device that supplies the pulverized coal as a slurry to the coal gasification furnace, provided between the coal gasification furnace and the gas turbine facility. the char fraction is separated and recovered from the gaseous fuel by char recovery apparatus, characterized that you supplied to the coal feed device as part of the material of the slurry.

According to the present invention, since the pulverized coal is supplied as a slurry from the coal feeder to the coal gasifier, the equipment configuration can be simplified and the manufacturing cost can be greatly increased compared to the case where the pulverized coal is supplied in a dry state. Can be reduced.
Moreover, since the gaseous fuel produced | generated by the coal gasification furnace is supplied to gas turbine equipment as it is, the thermal energy of the vapor | steam (water | moisture content) contained in gaseous fuel can be collect | recovered effectively by gas turbine equipment. Furthermore, the latent heat of condensation of the steam can be recovered by heating the feed water of the exhaust heat recovery boiler. By these, since the calorie | heat amount which pulverized coal has can be used effectively, the power generation efficiency of coal gasification combined cycle power generation equipment can be improved.

In the coal gasification combined power generation facility according to claim 2, moisture recovered from the flue gas desulfurization facility is supplied to the coal feeder as the material of the slurry.

  According to the present invention, since the moisture recovered from the flue gas desulfurization equipment is supplied to the coal feeder as the material of the slurry, the amount of water supplied to the coal feeder can be greatly reduced, and the operating cost can be reduced. .

Moreover, in the coal gasification combined power generation facility according to claim 1 , the char portion separated and recovered from the gaseous fuel by the char recovery device provided between the coal gasification furnace and the gas turbine facility is used as the slurry. It supplies to the said coal feeder as a part of material of this.

  In this way, the char portion separated and recovered from the gaseous fuel by the char recovery device is supplied to the coal feed device as the slurry material, so the char portion is supplied from the coal feed device to the coal gasifier. It will be. For this reason, since an expensive char burner or the like for supplying the char portion to the coal gasification furnace becomes unnecessary, the manufacturing cost of the coal gasification combined power generation facility can be further reduced.

In the combined coal gasification combined power generation method according to the present invention , pulverized coal is supplied as a slurry to a coal gasification furnace to be converted into gaseous fuel, the gaseous fuel is burned in a gas turbine facility, and the exhaust heat recovery boiler Steam is generated using combustion exhaust gas from the gas turbine equipment as a heat source to drive the steam gas turbine equipment, and power is generated using the power of the gas turbine equipment and / or the steam turbine equipment, and is discharged from the exhaust heat recovery boiler. The combustion exhaust gas is desulfurized by a flue gas desulfurization facility and discharged.

According to this reference , since the pulverized coal is supplied as a slurry to the coal gasification furnace, the device configuration can be simplified and the manufacturing cost can be greatly reduced as compared with the case where the pulverized coal is supplied in a dry state.
Moreover, since the gaseous fuel produced | generated by the coal gasification furnace is supplied to gas turbine equipment as it is, the thermal energy of the vapor | steam (water | moisture content) contained in gaseous fuel can be collect | recovered effectively by gas turbine equipment. Furthermore, the latent heat of condensation of the steam can be recovered by heating the feed water of the exhaust heat recovery boiler. By these, since the calorie | heat amount which pulverized coal has can be used effectively, the power generation efficiency of coal gasification combined cycle power generation equipment can be improved.

According to the present invention, since pulverized coal is supplied as a slurry from the coal supply device to the coal gasifier, the manufacturing cost can be greatly reduced as compared with the dry coal supply method.
Moreover, since the gaseous fuel produced | generated with the coal gasification furnace is supplied to gas turbine equipment as it is, the vapor | steam (water | moisture content) contained in gaseous fuel can be effectively utilized with gas turbine equipment as thermal energy. And since this steam is recovered as condensation latent heat in the flue gas desulfurization facility, the amount of heat of the pulverized coal can be used effectively, and the power generation efficiency of the coal gasification combined power generation facility can be improved.
Furthermore, since the water | moisture content collect | recovered from flue gas desulfurization equipment is supplied to the coal supply apparatus as a material of a slurry, an operating cost can be reduced.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, the combined coal gasification combined power generation facility 1 according to the first embodiment of the present invention will be described with reference to FIG.
As shown in Figure 1, Integrated Coal Gasification Combined Cycle (IGCC)
Gasification Combined Cycle) 1 includes a coal supply device 3, a coal gasification furnace 5, a char recovery device 7, a gas turbine facility 9, a steam turbine facility 11, a waste heat recovery boiler (HRSG) 13, and a desulfurization. Equipment 15.

The coal feeder 3 includes a raw coal bunker 17 that stores coal, a pulverized coal machine 19 that pulverizes coal into pulverized coal, a slurry production device 21, a primary ventilator (PAF) 23, and a slurry pump 25. And are provided.
The pulverized coal machine 19 pulverizes the coal supplied from the raw coal bunker 17 to obtain a pulverized coal of several μm to several hundred μm. The pulverized coal pulverized by the pulverized coal machine 19 is conveyed to the slurry production apparatus 21 by the air supplied from the primary ventilator 23.
In the slurry manufacturing apparatus 21, pulverized coal (65 to 70%) and water (30 to 35%) are agitated to produce a slurry. This slurry is pressurized by the slurry pump 25 and conveyed to the coal gasification furnace 5.

The coal gasification furnace 5 is connected to a coal gasification unit 27 formed so that gas flows from below to above and to the downstream side of the coal gasification unit 27, and gas flows from above to below. The heat exchange part 29 formed so that it may be formed is provided.
The coal gasifier 27 is provided with a combustor 31 and a reductor 33 from below. The combustor 31 burns a part of the pulverized coal and char, and the rest is a part that is released as volatile matter (CO, H ₂ , lower hydrocarbon) by thermal decomposition. The combustor 33 employs a spouted bed. However, it may be a fluidized bed type.

The combustor 31 and the reductor 33 are provided with a combustor burner 31a and a reductor burner 33a, respectively, and pulverized coal is supplied as slurry from the coal feeder 3 to the burners 31a and 33a.
The combustor burner 31a is supplied with oxygen from an air separation device (ASU) 35.
The combustor burner 31a may be supplied with air instead of oxygen. Further, oxygen may be added to the air to adjust and supply the oxygen amount.
In the reductor 33, the pulverized coal is gasified by the high-temperature combustion gas from the combustor 31. Thus, combustible gas such as CO or H ₂ is produced from coal. The coal gasification reaction is an endothermic reaction in which pulverized coal and carbon in char react with CO ₂ and H ₂ O in a high-temperature gas to generate CO and H ₂ .

A plurality of heat exchangers are installed in the heat exchange unit 29 of the coal gasification furnace 5, and steam is generated by obtaining sensible heat from the generated gas guided from the reductor 33. The steam generated in the heat exchanger is used as part of the steam for driving the steam turbine 51.
The product gas that has passed through the heat exchange unit 29 is guided to the char recovery device 7. The char collection device 7 includes a porous filter 37, a charlock hopper 39, and a char supply hopper 41.
The porous filter 37 includes a filter medium made of, for example, ceramic, and is configured to filter out char in the generated gas when the generated gas passes through the filter medium.
The captured char is deposited on the filtration surface of the porous filter 37 to form a char layer. In the char layer, the Na and K components contained in the product gas are condensed, and as a result, the Na and K components are also removed by the char recovery device 7, and significant corrosion in the gas turbine 9 can be prevented.

The filtered char is dropped downward by flowing backwashing gas such as nitrogen in a direction opposite to the flow of the gas fuel at a predetermined timing, and is deposited on the charlock hopper 39.
The charlock hopper 39 is provided with a pressure adjusting mechanism. When a predetermined amount of char is stored, the char is boosted to the pressure in the coal gasification furnace 5 and supplied to the char supply hopper 41.
The char stored in the char supply hopper is air-flowed by the nitrogen separated in the air separation device 35, returned to the combustor burner 31a of the coal gasification furnace 5, and recycled.
The Na and K components returned to the combustor burner 31a together with the char are discharged from below the coal gasification unit 27 together with the finally melted ash of pulverized coal. The molten and discharged ash is quenched with water and crushed into glassy slag.

The product gas that has passed through the char recovery device 7 is sent to the combustor 43 of the gas turbine equipment 9 as fuel gas.
The gas turbine equipment 9 includes a combustor 43 in which the produced gas is combusted, a gas turbine 45 driven by the combustion gas, and a turbo compressor 47 that sends high-pressure air to the combustor 43.
The gas turbine 45 and the turbo compressor 47 are connected by the same rotating shaft 49.
The combustion exhaust gas that has passed through the gas turbine 45 is guided to the exhaust heat recovery boiler 13.

The steam turbine 51 of the steam turbine equipment 11 is connected to the same rotating shaft 49 as the gas turbine 45, and is a so-called single-shaft combined system.
High-pressure steam is supplied to the steam turbine 51 from the coal gasification furnace 5 and the exhaust heat recovery boiler 13.
In addition, it is not limited to a single-shaft combined system, and may be a separate-shaft combined system.
A generator G that outputs electricity from a rotating shaft 49 driven by the gas turbine 45 and the steam turbine 51 is provided on the opposite side of the gas turbine equipment 9 with the steam turbine equipment 11 in between.
The arrangement position of the generator G is not limited to this position, and may be any position as long as an electrical output can be obtained from the rotating shaft 49.

  The exhaust heat recovery boiler 13 heats boiler feed water with combustion exhaust gas from the gas turbine 45 to generate steam. A boiler water supply piping system (not shown) that circulates between the steam turbine 51 and the exhaust heat recovery boiler 13 and in which water repeatedly changes its state in the order of feed water, steam, and condensate is provided. The combustion exhaust gas passage of the exhaust heat recovery boiler 13 is provided with a portion of the boiler feed water piping system that receives heat from the combustion exhaust gas and changes from feed water to steam. Of these, the part located downstream of the flue gas flow is the part where the feed water is preheated and the temperature is low, so some of the steam in the flue gas is deprived of heat and condensed into water and It has become.

A desulfurization facility 15 is provided downstream of the combustion exhaust gas flow of the waste heat recovery boiler 13.
The desulfurization facility 15 is provided with a flue gas desulfurization facility (FGD) 53 and a wet electrostatic precipitator (Wet-EP) 59.
As the flue gas desulfurization facility 53, for example, a known flue gas desulfurization facility such as a flue gas desulfurization facility using a limestone-gypsum method or a flue gas desulfurization facility using a magnesium hydroxide slurry method can be used.
In the flue gas desulfurization equipment 53, the absorbing liquid stored in the lower part is sprayed from the upper part, and when this is circulated, sulfur content (mainly SO ₂ ) in the exhaust gas is removed by the absorbing liquid. .
Part of the absorbent stored in the lower part of the flue gas desulfurization facility 53 is conveyed to the waste water treatment device 55. In the waste water treatment device 55, the absorbent is processed to produce a by-product, and water is discharged. This discharged water is conveyed and supplied to the slurry production apparatus 21 by the water supply pump 57.

A wet electric dust collection facility 59 is provided downstream of the flue gas flow of the flue gas desulfurization facility 53. The wet electrostatic precipitator removes SO ₃ mainly remaining as mist in exhaust gas and soot mainly composed of ammonium sulfate. Instead of the wet electric current collecting equipment 59, other types of dust collecting equipment may be used.
An induction fan (BUF) 61 is provided downstream of the combustion exhaust gas flow of the wet electrostatic precipitator 59. This attraction fan 61 induces the gas turbine combustion exhaust gas to release the combustion exhaust gas from the chimney 63 to the atmosphere.

  In addition, instead of the combination of the flue gas desulfurization facility 53 and the wet electrostatic precipitator 59 as the desulfurization facility 15, an activated carbon fiber (ACF) having an action of a catalyst that oxidizes sulfur is provided. Carbon desulfurization equipment may be used.

Next, operation | movement of the coal gasification combined cycle power generation equipment 1 concerning this embodiment comprised as mentioned above is demonstrated.
The coal supplied from the raw coal bunker 17 is pulverized into pulverized coal by the pulverized coal machine 19 and then supplied to the slurry production apparatus 21 by the air from the primary ventilator 23. In the slurry manufacturing apparatus 21, pulverized coal is mixed with water supplied from the waste water treatment apparatus 55 by the feed water pump 57 and other supplementary water (not shown) to form a slurry.
Thus, since the water collected from the waste water treatment device 55 of the desulfurization facility 53 is supplied to the slurry manufacturing device 21 as a slurry material, the amount of water supplied to the slurry manufacturing device 21 can be significantly reduced. The operating cost can be reduced.

The slurry produced by the slurry production apparatus 21 is supplied by the slurry pump 25 to the reductor burner 33a and the combustor burner 31a. Furthermore, the char recovered by the char recovery device 7 is supplied to the char burner 32a provided separately.
As the combustion gas for the combustor burner 31a, oxygen separated in the air separation device 35 is used. In the combustor 31, pulverized coal and char are partially burned by combustion oxygen.

In the reductor 33, the pulverized coal in the slurry supplied from the reductor burner 33a and the char released from the volatile matter in the combustor 31 are gasified by the high-temperature gas rising from the combustor 31, and are combustible gases such as CO and H _2. (Production gas) is generated.
The produced gas that has passed through the reductor 33 gives sensible heat to each heat exchanger while passing through the heat exchange section 29 of the coal gasification furnace 5 to generate steam. The steam generated in the heat exchange unit 29 is used for driving the steam turbine 51.
The product gas that has passed through the heat exchanging unit 29 is guided to the porous filter 37 of the char recovery device 7, and the char is filtered and recovered by the filter medium. At this time, Na content and K content in the gas are condensed here and taken into the char.

The char filtered by the porous filter 37 is dropped downward by flowing a backwashing gas such as nitrogen in a direction opposite to the flow of the gas fuel at a predetermined timing, and is deposited on the charlock hopper 39.
When a predetermined amount of char is stored in the charlock hopper 39, the pressure in the charlock hopper 39 is increased to the pressure in the coal gasification furnace 5, and in this state, the char lock hopper 41 communicates with the char supply hopper 41. Supplied to.
After the stored char is supplied to the char supply hopper 41, the pressure in the charlock hopper 39 is returned to the original state, and the char from the porous filter 37 is received again.
On the other hand, the char stored in the char supply hopper 41 is pneumatically transported in a pressurized state by nitrogen separated in the air separation device 35 and supplied to the char burner 32 a of the coal gasification furnace 5.

The product gas that has passed through the char recovery device 7 is guided to the combustor 43 of the gas turbine equipment 9 and burned together with the compressed air supplied from the turbo compressor 47. The gas turbine 45 is rotated by the combustion gas, and the rotating shaft 49 is driven.
The combustion exhaust gas that has passed through the gas turbine 45 is guided to the exhaust heat recovery boiler 13, and steam is generated by utilizing the sensible heat of the combustion exhaust gas. The steam generated in the exhaust heat recovery boiler 13 is used for driving the steam turbine 51.
At the time of such exhaust heat recovery of the combustion exhaust gas, the boiler feed water flowing through the boiler feed water piping system is heated by the high-temperature combustion exhaust gas and becomes steam on the upstream side of the combustion exhaust gas introduced into the exhaust heat recovery boiler 13. The combustion exhaust gas whose temperature has decreased due to this heat exchange passes through a boiler feed water piping system installed on the downstream side to heat and cool the low temperature boiler feed water. At this time, a part of the steam contained in the combustion exhaust gas is condensed into water, and the condensation latent heat is supplied to the boiler feed water as a heat quantity.

The steam turbine 51 is rotated by the steam from the coal gasification furnace 5 and the steam from the exhaust heat recovery boiler 13 and drives the same rotating shaft 49 as the gas turbine equipment 9. The rotational force of the rotating shaft 49 is converted into electrical output by the generator G.
The combustion exhaust gas that has passed through the exhaust heat recovery boiler 13 is guided to the flue gas desulfurization facility 53, where the sulfur content (SO ₂ ) is removed. For example, when removing by the limestone-gypsum method, the limestone (CaCO ₃ ) slurry mixed with the water in the flue gas desulfurization facility 53 and the sulfur content (SO ₂ ) are reacted, and the sulfur content is changed to gypsum (CaSO ₄ ). As removed.

The combustion exhaust gas from which the sulfur content (SO ₂ ) has been removed by the flue gas desulfurization facility 53 still contains mist-like sulfur content (SO ₃ ) and soot mainly composed of ammonium sulfate. It is removed by the dust facility 59. The soot dust is removed by the dust collecting action of the wet electric dust collecting equipment 59, and the SO ₃ is also mist-like, so that it is removed by the original dust collecting action of the wet electric dust collecting equipment 59.
The combustion exhaust gas from which the sulfur content (SO ₂ , SO ₃ ) and dust are removed is discharged from the chimney 63 to the atmosphere via the induction fan 61. The induction fan 61 attracts the combustion exhaust gas discharged from the wet electrostatic precipitator 59 and pumps it toward the chimney 63.

Hereinafter, the operation and effect of this embodiment will be described.
According to the present embodiment, since the pulverized coal is supplied as a slurry from the coal feeder 3 to the coal gasifier 5, the equipment configuration can be simplified and manufactured as compared with the case where the pulverized coal is supplied in a dry state. Cost can be greatly reduced.
Further, since the produced gas generated in the coal gasification furnace 5 is supplied to the gas turbine equipment 9 as it is, the steam contained in the produced gas generated from the moisture of the slurry is effectively used as heat energy in the gas turbine equipment 9. Can be used. The steam is also used for heating the feed water of the exhaust heat recovery boiler 13 and is condensed and recovered as moisture. At this time, the amount of heat lost as condensation latent heat in the coal gasification furnace 5 is lost. Can be recovered. By these, since the calorie | heat amount which pulverized coal has can be utilized effectively, the power generation efficiency of the coal gasification combined cycle power generation facility 1 can be improved.
Furthermore, since the water collected from the flue gas desulfurization facility 53 is supplied to the coal feeder 3 as a slurry material, the amount of water supplied to the coal feeder 3 can be greatly reduced, and the operating cost can be reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The basic configuration of the combined coal gasification combined power generation facility 1 of the present embodiment is the same as that of the first embodiment, but the configuration of the char recovery device 7 is different from that of the first embodiment. Therefore, in this embodiment, the char collection | recovery apparatus 7 is demonstrated using FIG. 2, and the overlapping description is abbreviate | omitted about another part.
In addition, the same code | symbol is attached | subjected to the component same as 1st embodiment, and the detailed description is abbreviate | omitted.
As shown in FIG. 2, the coal gasification combined power generation facility 1 of the present embodiment includes a coal supply device 3, a coal gasification furnace 5, a char recovery device 7, a gas turbine facility 9, and a steam turbine facility 11. And an exhaust heat recovery boiler 13 and a desulfurization facility 15 are provided.

In the present embodiment, the char recovery device 7 is provided with a porous filter 37, a decompression hopper 65, and a rotary feeder 67.
The decompression hopper 65 has a function of storing the char falling from the porous filter 37.
The rotary feeder 67 is configured to supply the char discharged from the decompression hopper 65 to the slurry manufacturing apparatus 21 in an atmospheric pressure state.

In the present embodiment configured as described above, the char recovered by the porous filter 37 of the char recovery device 7 falls downward by flowing backwashing gas such as nitrogen in a direction opposite to the flow of gas fuel at a predetermined timing. And is stored in the decompression hopper 65.
The char stored in the decompression hopper 65 is decompressed and then supplied to the slurry production apparatus 21 by the rotary feeder 67.
In the slurry manufacturing apparatus 21, the char is made into a slurry together with the pulverized coal, and is supplied again into the coal gasification furnace 5 by the slurry pump 25.

In the present embodiment, the following operations and effects are provided in addition to the operations and effects of the first embodiment.
That is, the char portion separated and recovered from the product gas by the char recovery device 7 is supplied to the slurry production device 21 as a slurry material, so that the char portion is supplied from the coal supply device 3 into the coal gasification furnace 5. Will be supplied. This eliminates the need for an expensive pneumatic conveying system that adjusts the pressure to supply the char to the high-pressure coal gasification furnace 5. Further, a dedicated char burner 32a for supplying char becomes unnecessary. For this reason, the manufacturing cost of the coal gasification combined power generation facility 1 can be further reduced.

  In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably.

It is a block diagram which shows schematic structure of the coal gasification combined cycle power generation facility concerning 1st embodiment of this invention. It is a block diagram which shows schematic structure of the coal gasification combined cycle facility concerning 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coal gasification combined cycle power generation equipment 3 Coal supply equipment 5 Coal gasification furnace 7 Char recovery equipment 9 Gas turbine equipment 11 Steam turbine equipment 13 Waste heat recovery boiler 15 Flue gas desulfurization equipment G Power generation equipment

Claims (2)

A coal gasifier that processes pulverized coal and converts it to gaseous fuel;
A gas turbine facility operated using the gaseous fuel as a fuel;
A steam turbine facility operated by steam generated by an exhaust heat recovery boiler that introduces combustion exhaust gas of the gas turbine facility;
A generator coupled to the gas turbine equipment and / or the steam turbine equipment;
Flue gas desulfurization equipment for desulfurizing the combustion exhaust gas discharged from the exhaust heat recovery boiler;
A coal feeder for supplying the pulverized coal as a slurry to the coal gasifier ,
Rukoto to supply the char fraction is separated and recovered from the gaseous fuel by char recovery device provided between said gas turbine equipment and the coal gasification furnace, the coal feed device as part of the material of the slurry Coal gasification combined power generation facility characterized by   2. The coal gasification combined power generation facility according to claim 1, wherein moisture recovered from the flue gas desulfurization facility is supplied to the coal feeder as a material of the slurry.

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