JP2013253611A - Gas turbine plant, method of operating the same, and gasification fuel power generation facility including gas turbine plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas turbine plant capable of effectively charging moisture to fuel gas and effectively reducing NOx while maintaining soundness of equipment, to provide a method of operating the gas turbine plant, and to provide a gasification fuel power generation facility including the gas turbine plant.SOLUTION: A gas turbine plant includes: a gas turbine 5 having a combustor 5a burning fuel gas; and a diluent supply device 31 connected to the combustor 5a to supply a diluent diluting the fuel gas. The diluent supply device 31 includes: a multistage diluent compressor 33 compressing the diluent to make the diluent have pressure higher than atmospheric pressure; and a moisture supply means 34. A heat exchanger 38 cooling the diluent is installed at an intermediate stage of the diluent compressor 33. The moisture supply means 34 is connected to a diluent flow passage arranged in the wake flow of the diluent compressor 33 to supply moisture to the diluent compressed by the diluent compressor 33.

Description

  The present invention relates to a gas turbine plant, a method for operating the gas turbine plant, and a gasification fuel power generation facility including the gas turbine plant, and more particularly, to a means for supplying moisture to fuel gas.

  As a method of suppressing NOx discharged from the combustor of the gas turbine, the injection of steam into the combustor, the direct injection of water into the combustor, the use of fuel gas diluted with nitrogen, water, steam, etc. in advance, patent As disclosed in Document 1, nitrogen is introduced into a combustor as a diluent. In addition, in order to reduce carbon dioxide generated after burning fuel gas, carbon monoxide contained in fuel gas is reacted with steam in advance to generate carbon dioxide, and the generated carbon dioxide is removed. Things have been done.

Japanese Patent No. 3973772

However, in order to reduce carbon dioxide, when vapor is supplied to carbon monoxide in the fuel gas and reacted to generate carbon dioxide, a large amount of hydrogen is generated. For this reason, there is a problem that the concentration of hydrogen in the fuel gas increases and NOx is likely to be generated. In addition, when water is directly injected into the combustor, there are problems such as corrosion of equipment due to moisture, high-temperature heat resistance, and performance deterioration.
Patent Document 1 discloses a method for cooling equipment using steam or high-pressure air generated by heat exchange in a power generation facility. However, it is possible to effectively reduce carbon dioxide and NOx by adding moisture. Is not disclosed.

  The present invention has been made in view of such circumstances, and is a gas turbine capable of effectively reducing NOx while effectively supplying moisture to fuel gas and maintaining the soundness of equipment. It aims at providing a plant, its operating method, and the gasification fuel power generation equipment provided with this.

In order to solve the above problems, the gas turbine plant of the present invention, the operation method thereof, and the gasification fuel power generation facility equipped with the gas turbine plant employ the following means.
That is, a gas turbine plant according to the present invention includes a gas turbine including a combustor that burns fuel gas, and a diluent supply device that is connected to the combustor and supplies a diluent that dilutes the fuel gas. In the gas turbine plant, the diluent supply device includes a multistage diluent compressor that compresses the diluent to a pressure higher than atmospheric pressure, and moisture supply means, and an intermediate stage of the diluent compressor. Includes a heat exchanger for cooling the diluent, and the water supply means is connected to a diluent flow path provided downstream of the diluent compressor and compressed by the diluent compressor. Moisture is supplied to the diluted diluent.

  According to the above configuration, since moisture is supplied to the diluent compressed to a pressure higher than atmospheric pressure by the diluent compressor, the moisture is gasified by the sensible heat of the diluent that has been compressed to a high temperature. The In the combustor, the diluent, gasified moisture, and fuel gas are mixed and burned. Therefore, compared to direct humidification of fuel gas and direct water injection to the combustor, it is possible to prevent the corrosion resistance, high temperature heat resistance and functional deterioration of the equipment and to effectively suppress the generation of NOx. it can.

  In addition, by providing a heat exchanger for cooling the diluent in the middle stage of the diluent compressor, it is possible to reduce power for driving the latter diluent compressor. In addition, in a pipe or a combustor for transferring fuel gas, a high temperature surface may be damaged by thermal shock when moisture is in direct contact. Since water supply means is provided in the diluent flow path provided downstream of the diluent compressor so that the fuel gas and water are not mixed directly, the fuel gas is mixed with water or in the combustor. Compared with the case of injecting fuel gas and moisture, the fuel gas and diluent containing moisture can be burned more safely, and the generation of NOx can be suppressed.

Furthermore, since the water supply means for supplying water to the compressed diluent is connected to the diluent flow path provided downstream of the diluent compressor, the temperature can be sufficiently lowered by the heat exchanger. The temperature of the diluent that could not be reduced can be lowered. In addition, as described above, since the supplied water can be gasified by the sensible heat of the diluent that has been compressed by the diluent compressor and the temperature is increased, the heat is higher than when no water supply means is provided. The capacity of the exchanger can be reduced.
In addition, since it is sufficient to add a water supply means to the conventional general equipment structure, the equipment installation cost can be reduced.

  In the gas turbine plant according to the present invention, the moisture supplied from the moisture supply means to the diluent compressed by the diluent compressor is gasified by sensible heat of the compressed diluent. To the fuel gas.

  As a result, the diluent and gasified water are mixed with the fuel gas and burned. Therefore, compared to direct humidification of the fuel gas or direct water injection into the combustor, the corrosion resistance and high temperature heat resistance of the equipment In addition to preventing functional deterioration, generation of NOx can be effectively suppressed.

  An operation method of a gas turbine plant according to the present invention is an operation method of a gas turbine plant in which a diluent is supplied to a fuel gas supplied to a combustor of the gas turbine to dilute the fuel gas. The agent is compressed to a pressure higher than atmospheric pressure by a multistage diluent compressor, the diluent is heat-exchanged and cooled in an intermediate stage of the diluent compressor, and on the downstream side of the diluent compressor, Water is supplied to the cooled diluent, and the moisture is gasified by sensible heat of the diluent that has been compressed to a high temperature.

  According to the above operating method, moisture is gasified by the sensible heat of the diluent by supplying the moisture to the diluent that has been compressed by the diluent compressor and has a pressure higher than atmospheric pressure and higher. For this reason, in the combustor, the diluent, gasified moisture, and the fuel gas are mixed and burned. Therefore, compared to direct humidification of fuel gas and direct water injection to the combustor, it is possible to prevent the corrosion resistance, high temperature heat resistance and functional deterioration of the equipment and to effectively suppress the generation of NOx. it can.

  A gasification fuel power generation facility according to the present invention includes the gas turbine plant according to any one of the above, a gasification facility that generates fuel gas supplied to the combustor of the gas turbine, and the gas turbine. A steam turbine that is driven by steam generated by an exhaust gas boiler into which exhaust gas discharged from the plant is introduced, and a generator that generates electric power using the gas turbine and the steam turbine.

Compared to direct humidification of fuel gas and direct water injection to the combustor, it can prevent the corrosion resistance, high temperature heat resistance, and functional deterioration of the equipment, thus maintaining the soundness of gasification fuel power generation equipment The generation of NOx can be effectively suppressed.
In addition, typically as a gasification installation, the coal gasification installation which gasifies coal is mentioned.

  According to the present invention, since moisture is supplied to the compressed diluent, the moisture is gasified by the sensible heat of the diluent that has been compressed by the diluent compressor to a high temperature. In the combustor, the diluent, gasified moisture, and fuel gas are mixed and burned. Therefore, compared to direct humidification of fuel gas and direct water injection to the combustor, it is possible to prevent the corrosion resistance, high temperature heat resistance and functional deterioration of the equipment and to effectively suppress the generation of NOx. it can.

It is a schematic block diagram of the gasification fuel power generation equipment which concerns on this invention. It is a schematic block diagram which shows the principal part of the gas turbine plant of the gasification fuel power generation equipment shown in FIG. 1 which concerns on 1st reference embodiment. It is a schematic block diagram which shows the principal part of the gas turbine plant of the gasification fuel power generation equipment shown in FIG. 1 which concerns on 2nd reference embodiment. It is a schematic block diagram which shows the principal part of the gas turbine plant of the gasification fuel power generation equipment shown in FIG. 1 which concerns on 1st Embodiment. It is a schematic block diagram which shows the principal part of the gas turbine plant of the gasification fuel power generation equipment shown in FIG. 1 which concerns on 3rd reference embodiment.

Hereinafter, several embodiment of the coal gasification combined cycle power generation equipment (gasification fuel power generation equipment) concerning the present invention is described.
As shown in FIG. 1, an integrated coal gasification combined cycle (IGCC) 1 using coal as fuel is mainly composed of a coal gasification furnace (gasification facility) 3 and a gas turbine plant. 4 and steam turbine equipment 7.
A coal supply facility 10 for supplying pulverized coal to the coal gasifier 3 is provided on the upstream side of the coal gasifier 3. The coal supply facility 10 includes a pulverizer (not shown) that pulverizes raw coal into pulverized coal of several μm to several hundred μm. The pulverized coal pulverized by the pulverizer is a plurality of hoppers 11. , 11... Are stored.

The pulverized coal stored in each hopper 11 is conveyed to the coal gasification furnace 3 together with nitrogen supplied from the air separation device 15 at a constant flow rate.
The coal gasification furnace 3 is connected to the coal gasification unit 3a formed so that gas flows from below to above and to the downstream side of the coal gasification unit 3a, and gas flows from above to below. The heat exchange part 3b formed in this way is provided.
The coal gasification unit 3a is provided with a combustor 13 and a reductor 14 from below. The combustor 13 burns a part of the pulverized coal and char, and the remainder is a part that is released as volatile components (carbon monoxide, hydrogen, lower hydrocarbons) by thermal decomposition. The combustor 13 has a spouted bed. However, it may be a fluidized bed type or a fixed bed type.

The combustor 13 and the reductor 14 are provided with a combustor burner 13a and a reductor burner 14a, respectively, and pulverized coal is supplied from the coal supply facility 10 to the burners 13a and 14a.
The combustor burner 13 a is supplied with air from the air booster 17 together with oxygen separated in the air separation device 15. As described above, the combustor burner 13a is supplied with air whose oxygen concentration is adjusted.
In the reductor 14, the pulverized coal is gasified by the high temperature gas from the combustor 13. Thereby, combustible gas (fuel gas), such as carbon monoxide and hydrogen, is produced | generated from coal. The coal gasification reaction is an endothermic reaction in which carbon in pulverized coal and char reacts with carbon dioxide and moisture in high-temperature gas to generate carbon monoxide and hydrogen.

A plurality of heat exchangers are installed in the heat exchange part 3b of the coal gasification furnace 3, and steam is generated by obtaining sensible heat from the fuel gas guided from the reductor 14. The steam generated in the heat exchanger is mainly used as driving steam for the steam turbine 7b.
The fuel gas that has passed through the heat exchanging unit 3 b is guided to the char recovery device 20. The char recovery device 20 includes a porous filter, and captures and recovers char mixed in the fuel gas by passing through the porous filter. The char collected in this way is returned to the combustor burner 13a of the coal gasification furnace 3 together with the nitrogen separated in the air separation device 15 and recycled.

The fuel gas that has passed through the char recovery device 20 is sent to the combustor 5 a of the gas turbine 5 through the pipe 25.
A pipe 25 connecting the char recovery device 20 and the combustor 5 a of the gas turbine 5 is provided with a branch path 22, and a ground is provided downstream of the branch path 22 via an on-off valve 23. A flare 24 is provided. The ground flare 24 is a facility that completely burns the fuel gas that is not introduced into the gas turbine 5 and releases it into the atmosphere as a harmless clean gas.

The gas turbine plant 4 includes a gas turbine 5 and a diluent supply device 31.
The gas turbine 5 includes a combustor 5a, a gas turbine 5b driven by fuel gas, and a turbo compressor 5c that sends high-pressure air to the combustor 5a. In the combustor 5a, the fuel gas guided by the pipe 25, the nitrogen that is the diluent supplied from the diluent supply device 31, and the gasified moisture are combusted. The gas turbine 5b and the turbo compressor 5c are connected by the same rotating shaft 5d. The air compressed in the turbo compressor 5c is guided to the air booster 17 separately from the combustor 5a. The exhaust gas that has passed through the gas turbine 5 b is guided to the exhaust gas boiler 30.

The steam turbine 7b of the steam turbine facility 7 is connected to the same rotating shaft 5d as the gas turbine 5, and is a so-called single-shaft combined system. High-pressure steam is supplied from the coal gasification furnace 3 and the exhaust gas boiler 30 to the steam turbine 7b. 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 5d driven by the gas turbine 5b and the steam turbine 7b is provided on the opposite side of the gas turbine 5b via the steam turbine 7b. The arrangement position of the generator G is not limited to this position, and may be any position as long as power can be obtained from the rotating shaft 5d.

  The exhaust gas boiler 30 generates steam by the exhaust gas from the gas turbine 5b. The steam generated in the exhaust gas boiler 30 is supplied to the steam turbine 7b.

[First embodiment]
FIG. 2 shows the configuration of the gas turbine plant 4 according to the first reference embodiment of the present invention.
The gas turbine plant 4 includes a gas turbine 5 and a diluent supply device 31.
The gas turbine 5 includes a combustor 5a, a gas turbine 5b driven by fuel gas, and a turbo compressor 5c that sends high-pressure air to the combustor 5a. In the combustor 5a, the fuel gas guided by the pipe 25, the nitrogen that is the diluent supplied from the diluent supply device 31 through the pipe 35, and the gasified moisture are combusted. The gas turbine 5b and the turbo compressor 5c are connected by the same rotating shaft 5d. The air compressed in the turbo compressor 5c is guided to the air booster 17 (see FIG. 1) separately from the combustor 5a. The exhaust gas that has passed through the gas turbine 5b is guided to the exhaust gas boiler 30 (see FIG. 1).

The diluent supply device 31 includes a diluent compressor 32 and moisture supply means 34.
The diluent compressor 32 is a single stage compressor 32a. The diluent compressor 32 includes a compressor 32a, a motor M, and a rotating shaft 32b driven by the motor M. The diluent compressor 32 is supplied with nitrogen as a diluent from the air separation device 15 (see FIG. 1). When the rotating shaft 32b is driven by the motor M, the compressor 32a provided in the rotating shaft 32b is rotationally driven and compresses nitrogen.
The moisture supply means 34 is provided on a pipe 35 (diluent flow path) connected to the downstream of the diluent compressor 32. The moisture supply means 34 supplies moisture to the nitrogen led out to the pipe 35.
The pipe 35 is provided between the diluent compressor 32 and the pipe 25.

Next, an operation method of the coal gasification combined power generation facility 1 and the gas turbine plant 4 will be described with reference to FIGS. 1 and 2.
After the raw coal is pulverized by a pulverizer, it is guided to the hopper 11 and stored. The pulverized coal stored in the hopper 11 is supplied to the reductor burner 14a and the combustor burner 13a together with the nitrogen separated in the air separation device 15. Further, not only pulverized coal but also char collected in the char collection device 20 is supplied to the combustor burner 13a.
As the combustion air for the combustor burner 13a, air obtained by adding the oxygen separated by the air separation device 15 to the compressed air obtained by further boosting the compressed air extracted from the turbo compressor 5c by the air booster 17 is used. . In the combustor 13, the pulverized coal and char are partially burned by the combustion air, and the remainder is thermally decomposed into volatile components (carbon monoxide, hydrogen, lower hydrocarbons).

In the reductor 14, the pulverized coal supplied from the reductor burner 14a and the char released from the volatile matter in the combustor 13 are gasified by the high-temperature gas rising from the combustor 13, and combustible gases such as carbon monoxide and hydrogen are produced. (Fuel gas) is generated.
The fuel gas that has passed through the reductor 14 gives its sensible heat to each heat exchanger while passing through the heat exchange section 3b of the coal gasification furnace 3, thereby generating steam. The steam generated in the heat exchange unit 3b is mainly used for driving the steam turbine 7b.
The fuel gas that has passed through the heat exchanging section 3b is guided to the char recovery device 20, and the char is recovered. The collected char is returned to the coal gasifier 3.
The flow rate of the fuel gas that has passed through the char recovery device 20 is adjusted by the flow rate control valve 23, and a part thereof is guided to the ground flare 24 and completely burned by the ground flare 24. The remainder of the fuel gas that has passed through the char recovery device 20 is supplied from the pipe 25 to the combustor 5 a of the gas turbine 5.

  Part of the nitrogen separated by the air separation device 15 is introduced into the diluent compressor 32. Nitrogen introduced into the diluent compressor 32 is compressed by a compressor 32 a driven by a motor M. The compressed nitrogen and high temperature is led out to the pipe 35. Moisture is supplied to the derived nitrogen from the water supply means 34 provided on the pipe 35. The supplied moisture is gasified by the sensible heat of the compressed nitrogen that has reached a high temperature. Moreover, the high-temperature compressed nitrogen led out to the pipe 35 is cooled by the supplied moisture. The cooled compressed nitrogen and the gasified moisture are led to the pipe 25 through the pipe 35.

  The fuel gas whose flow rate is adjusted by the flow rate adjusting valve 23 and led to the pipe 25, the compressed nitrogen and gasified moisture led out from the pipe 35, and the compressed air supplied from the turbo compressor 5 c are a gas turbine. 5 to the combustor 5a and burned. The gas turbine 5b is rotated by the exhaust gas generated by fueling them, and the rotating shaft 5d is driven.

  The exhaust gas that has passed through the gas turbine 5b is guided to the exhaust gas boiler 30, and steam is generated by utilizing the sensible heat of the exhaust gas. The steam generated in the exhaust gas boiler 30 is mainly used for driving the steam turbine 7b.

The steam turbine 7 b is rotated by the steam from the coal gasification furnace 3 and the steam from the exhaust gas boiler 30, and drives the same rotating shaft 5 d as the gas turbine 5. The rotating force of the rotating shaft 5d is converted into electric power by the generator G.
The exhaust gas that has passed through the exhaust gas boiler 30 is released from the chimney 28 to the atmosphere.

As described above, the gas turbine plant 4 according to the present embodiment has the following operational effects.
Since moisture is supplied to the compressed nitrogen, the moisture is gasified by the sensible heat of the nitrogen that has been compressed by the diluent compressor 32 (32a) to a high temperature. In the combustor 5a, compressed nitrogen, gasified moisture, and fuel gas are mixed and burned. Therefore, compared to direct humidification of fuel gas or direct water injection to the combustor 5a, it is possible to prevent the corrosion resistance, high temperature heat resistance and functional deterioration of the equipment and effectively suppress the generation of NOx. Can do.

  In addition, compared to direct humidification of fuel gas or direct water injection to the combustor 5a, the corrosion resistance, high temperature heat resistance, and functional deterioration of the equipment can be prevented, so the soundness of the coal gasification combined power generation facility 1 Can be maintained, and generation of NOx can be effectively suppressed.

In addition, in this reference embodiment, although demonstrated using coal gasification gas as fuel gas, this invention is not limited to this, Heavy oil gasification gas etc. may be sufficient.
Moreover, in this reference embodiment, although demonstrated using the coal gasification combined cycle power generation equipment 1, this invention is not limited to this, It has the combustor 5a which burns carbon monoxide and hydrogen as fuel gas. Any facility that generates power using the gas turbine 5 may be used.

[Second embodiment]
Hereinafter, a second reference embodiment of the present invention will be described with reference to FIG. In the configuration of the combined coal gasification combined power generation facility and the gas turbine plant according to the present embodiment, a two-stage compressor is used as a diluent compressor, and a moisture supply means is provided in an intermediate stage of the two-stage compressor. This is different from the first reference embodiment in the points, and the other points are the same.
The operation method of the coal gasification combined power generation facility and the gas turbine plant is different in that the diluent compressor compresses nitrogen in two stages, and the others are the same.
Therefore, about the same structure and operation method, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

Diluent compressor 33 is a two-stage compressor 33a, 33b. The diluent compressor 33 includes a front-stage compressor 33a, a rear-stage compressor 33b, a motor M, and a rotating shaft 33c driven by the motor M. The diluent compressor 33 is supplied with nitrogen, which is a diluent, from the air separation device 15 (see FIG. 1). When the rotary shaft 33c is driven by the motor M, the compressors 33a and 33b provided on the rotary shaft 33c are rotationally driven to compress nitrogen in two stages.
The moisture supply means 34 is provided at an intermediate stage between the compressor 33a at the front stage and the compressor 33b at the rear stage of the diluent compressor 33.
A pipe 36 is connected between the moisture supply means 34 and the preceding compressor 33a. A pipe 37 having a sufficient pipe length for gasifying the water is connected between the water supply means 34 and the downstream compressor 33b. A pipe 35 is provided between the diluent compressor 33 and the pipe 25.

  A part of the nitrogen separated by the air separation device 15 (see FIG. 1) is introduced into the diluent compressor 33. Nitrogen introduced into the diluent compressor 33 is compressed by a preceding compressor 33 a driven by a motor M. The compressed nitrogen and high temperature is led out to the pipe 36. Moisture is supplied from the moisture supply means 34 to the compressed nitrogen led out to the pipe 36. The amount of water supplied from the water supply means 34 is controlled by the component of the fuel gas supplied from the pipe 25 to the combustor 5 a and the temperature of nitrogen in the downstream of the diluent compressor 33. The supplied water is gasified by passing through a pipe 37 having a sufficient pipe length to gasify the sensible heat of nitrogen and the gas that have been compressed to a high temperature. Further, the nitrogen that has been compressed and heated to a high temperature by the former compressor 33a is cooled by the supplied moisture. The cooled compressed nitrogen and the gasified moisture are introduced from the pipe 37 to the subsequent compressor 33b. The introduced nitrogen is further compressed to a high pressure by the subsequent compressor 33b. Nitrogen compressed by the downstream compressor 33b and the gasified moisture are led to the pipe 25 via the pipe 35.

As described above, the gas turbine plant 4 according to the present embodiment has the following operational effects.
Since moisture is supplied to the intermediate stage of the diluent compressor 33, the temperature of nitrogen introduced to the compressor 33b provided at the subsequent stage of the moisture supply means 34 can be lowered. As a result, the power of the subsequent compressor 33b can be reduced. Therefore, the generation of NOx can be suppressed and the power consumed can be reduced.

In the reference embodiment, the diluent compressor 33 has been described as the two-stage compressors 33a and 33b. However, the present invention is not limited to this and may be a multistage compressor having three or more stages. good.
Moreover, although the piping 37 provided in the downstream of the diluent supply means 34 has been described as having a sufficient pipeline length for gasifying moisture, the present invention is not limited to this. A steam separator may be provided on the pipe 37 to shorten the pipe length of the pipe 37.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG. The configuration of the combined coal gasification combined power generation facility and gas turbine plant of this embodiment uses a two-stage compressor as a diluent compressor, and a heat exchanger for cooling nitrogen is provided in the middle stage of the two-stage compressor. In this respect, it is different from the first reference embodiment, and the others are the same.
The operation method of the coal gasification combined cycle power generation facility and the gas turbine plant is different in that the diluent compressor compresses nitrogen in two stages, and the compressed and heated nitrogen is cooled by the heat exchanger. Others are the same.
Therefore, about the same structure and operation method, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

Diluent compressor 33 is a two-stage compressor 33a, 33b. The diluent compressor 33 includes a front-stage compressor 33a, a rear-stage compressor 33b, a motor M, and a rotating shaft 33c driven by the motor M. The diluent compressor 33 is supplied with nitrogen, which is a diluent, from the air separation device 15 (see FIG. 1). When the rotary shaft 33c is driven by the motor M, the compressors 33a and 33b provided on the rotary shaft 33c are rotationally driven to compress nitrogen in two stages.
The heat exchanger 38 cools nitrogen introduced by using water as a refrigerant. The heat exchanger 38 is provided in an intermediate stage between the compressor 33a at the front stage and the compressor 33b at the rear stage of the diluent compressor 33.
A pipe 36 is connected between the heat exchanger 38 and the preceding compressor 33a. A pipe 39 is connected between the heat exchanger 38 and the downstream compressor 33b. A pipe 35 is provided between the diluent compressor 33 and the pipe 25.

  A part of the nitrogen separated by the air separation device 15 (see FIG. 1) is introduced into the diluent compressor 33. Nitrogen introduced into the diluent compressor 33 is compressed by a preceding compressor 33 a driven by a motor M. The compressed nitrogen and high temperature is led out to the pipe 36. The compressed nitrogen led out to the pipe 36 is introduced into the heat exchanger 38. The high-temperature nitrogen introduced into the heat exchanger 38 is cooled by exchanging heat with water. The cooled compressed nitrogen is led out from the heat exchanger 38 to the pipe 39 and introduced into the subsequent compressor 33b. Nitrogen compressed to a higher pressure by the subsequent compressor 33 b is led out to the pipe 35. Moisture is supplied to the high-pressure nitrogen led out to the pipe 35 from a water supply means 34 provided on the pipe 35. The supplied moisture is gasified by the sensible heat of nitrogen that has been compressed to a high temperature. Further, the nitrogen that has been compressed by the diluent compressor 33 to a high temperature is cooled by the supplied moisture. The cooled compressed nitrogen and the gasified moisture are led to the pipe 25 through the pipe 35.

As described above, the gas turbine plant 4 according to the present embodiment has the following operational effects.
By providing the heat exchanger 38 for cooling nitrogen in the intermediate stage of the diluent compressor 33, the power for driving the downstream compressor 33b can be reduced. Further, the pipe 25, the combustor 5a, and the like that transfer the fuel gas may be damaged by a thermal shock when the moisture is in direct contact. Since the water supply means 34 is provided in the pipe (diluent flow path) 35 provided downstream of the diluent compressor 33 so that the fuel gas and the water are not directly mixed, the water is mixed with the fuel gas. In comparison with the case where the fuel gas and moisture are injected into the combustor 5a, the fuel gas and nitrogen containing moisture can be burned more safely and the generation of NOx can be suppressed.

  In the present embodiment, the moisture supply means 34 has been described as being provided on the pipe 35 connected between the diluent compressor 33 and the pipe 25, but the present invention is not limited to this. A heat exchanger having a refrigerant that exchanges heat with nitrogen compressed by a downstream compressor 33b on a pipe 35 connected between the diluent compressor 33 and the pipe 25, and a moisture supply means 34 You may provide in order. In this case, moisture supply means supplies moisture (for example, steam) having the same temperature as nitrogen derived from the heat exchanger provided on the pipe 35 connected between the diluent compressor 33 and the pipe 25. By supplying from 34, the start-up operation in the cold state of the coal gasification combined cycle facility 1 can be facilitated.

  In the present embodiment, the diluent compressor 33 has been described as the two-stage compressors 33a and 33b. However, the present invention is not limited to this and may be a multistage compressor having three or more stages. .

[Third Reference Embodiment]
Hereinafter, a third reference embodiment of the present invention will be described with reference to FIG. In the configuration of the combined coal gasification combined power generation facility and gas turbine plant of the present embodiment, a two-stage compressor is used as a diluent compressor, and a heat exchanger that cools nitrogen is provided in an intermediate stage of the two-stage compressor. It is different from the first reference embodiment in that a moisture supply means is provided, and the others are the same.
Moreover, the operation method of the coal gasification combined power generation facility and the gas turbine plant is such that the diluent compressor compresses nitrogen in two stages, and the compressed and heated nitrogen is cooled by the heat exchanger, The difference is that water is supplied from the water supply device to the derived nitrogen, and the others are the same.
Therefore, about the same structure and operation method, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

Diluent compressor 33 is a two-stage compressor 33a, 33b. The diluent compressor 33 includes a front-stage compressor 33a, a rear-stage compressor 33b, a motor M, and a rotating shaft 33c driven by the motor M. Nitrogen is supplied to the diluent compressor 33 from the air separation device 15 (see FIG. 1). When the rotary shaft 33c is driven by the motor M, the compressors 33a and 33b provided on the rotary shaft 33c are rotationally driven to compress nitrogen in two stages.
The heat exchanger 38 uses water as a refrigerant and cools the introduced nitrogen. The heat exchanger 38 is provided in an intermediate stage between the compressor 33a at the front stage and the compressor 33b at the rear stage of the diluent compressor 33.
The moisture supply means 34 is an intermediate stage between the compressor 33 a at the front stage and the compressor 33 b at the rear stage of the diluent compressor 33, and is provided downstream of the heat exchanger 38.
A pipe 36 is connected between the front-stage compressor 33a and the heat exchanger 38. In addition, a pipe 37 having a pipe length sufficient for gasifying moisture is connected between the heat exchanger 38 and the subsequent compressor 33b. The moisture supply means 34 is provided upstream of the pipe 37. A pipe 35 is provided between the diluent compressor 33 and the pipe 25.

  A part of the nitrogen that is the diluent separated by the air separation device 15 (see FIG. 1) is introduced into the diluent compressor 33. Nitrogen introduced into the diluent compressor 33 is compressed by a preceding compressor 33 a driven by a motor M. The compressed nitrogen and high temperature is led out to the pipe 36. The compressed nitrogen led out to the pipe 36 is introduced into the heat exchanger 38. The high-temperature nitrogen introduced into the heat exchanger 38 is cooled by exchanging heat with water. The cooled compressed nitrogen is led out from the heat exchanger 38 to the pipe 37. Moisture is supplied to the nitrogen led out to the pipe 37 from the water cooling means 34 provided in the pipe 37. The supplied water is gasified by passing through a sensible heat of nitrogen that has been compressed to a high temperature and a pipe 37 having a pipe length sufficient to gasify the supplied water. Further, the temperature of the nitrogen which has been compressed by the compressor 33a in the previous stage and becomes high temperature is further lowered by the moisture supplied from the heat exchanger 38 and the moisture supply means 34. The compressed nitrogen and the gasified moisture whose temperature has been lowered are introduced from the pipe 37 to the compressor 33b at the subsequent stage. Nitrogen and gasified moisture further compressed by the subsequent compressor 33 b are guided to the pipe 25 through the pipe 35.

As described above, the gas turbine plant 4 according to the present embodiment has the following operational effects.
In the middle stage of the diluent compressor 33, a heat exchanger 38 for cooling nitrogen and a moisture supply means 34 are provided. Therefore, the temperature of nitrogen that could not be lowered sufficiently by the heat exchanger 38 can be lowered. Further, the supplied water can be gasified by sensible heat of nitrogen which has been compressed by the diluent compressor 33 and whose temperature has increased. Therefore, the capacity of the heat exchanger 38 can be reduced and the generation of NOx can be suppressed as compared with the case where the water supply means 34 is not provided.
Moreover, since it is sufficient to add the water supply means 34 to the conventional general equipment structure, the equipment installation cost can be reduced.

  In the present embodiment, the diluent compressor 33 has been described as the two-stage compressors 33a and 33b. However, the present invention is not limited to this and may be a multistage compressor having three or more stages. .

4 Gas Turbine Plant 5 Gas Turbine 5a Combustor 31 Diluent Supply Device 32, 33 Diluent Compressor 34 Moisture Supply Means

Claims (4)

A gas turbine comprising a combustor for burning fuel gas;
In a gas turbine plant comprising: a diluent supply device connected to the combustor for supplying a diluent for diluting a fuel gas;
The diluent supply apparatus includes a multistage diluent compressor that compresses the diluent to a pressure higher than atmospheric pressure, and moisture supply means.
The middle stage of the diluent compressor includes a heat exchanger that cools the diluent,
The water supply means is connected to a diluent flow path provided downstream of the diluent compressor, and supplies water to the diluent compressed by the diluent compressor. Gas turbine plant.   The water supplied from the water supply means to the diluent compressed by the diluent compressor is gasified by the sensible heat of the compressed diluent and then mixed with the fuel gas. The gas turbine plant according to claim 1. An operation method of a gas turbine plant for diluting the fuel gas by supplying a diluent to the fuel gas supplied to the combustor of the gas turbine,
The diluent is compressed to a pressure higher than atmospheric pressure by a multistage diluent compressor,
In the middle stage of the diluent compressor, the diluent is heat exchanged and cooled,
Supplying water to the cooled diluent on the downstream side of the diluent compressor;
A method for operating a gas turbine plant, characterized in that water is gasified by sensible heat of a diluent that has been compressed to a high temperature. A gas turbine plant according to claim 1 or 2,
A gasification facility for generating fuel gas to be supplied to the combustor of the gas turbine;
A steam turbine driven by steam generated by an exhaust gas boiler into which exhaust gas discharged from the gas turbine plant is introduced;
A gasification fuel power generation facility, comprising: a generator that generates electric power using the gas turbine and the steam turbine.

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