JPH1182063A - Gas turbine plant and coal gasification combined cycle power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the output of a gas turbine by providing an intake air cooling part on the air compressor of a gas turbine plant having a gas turbine combustor in the middle between the air compressor and the gas turbine, and cooling the atmospheric air to increase the flow weight followed by supplying. SOLUTION: An intake air cooling part 17 is provided with an ice heat accumulator 18, a pump 19, and an air cooler 20, and the cold water of an artificial ice made in the night by the ice heat accumulator 18 is supplied to the air cooler 20 through the pump 19 and a first control valve 21. The water is made into heated water by taking the heat of the atmospheric air taken there to form a heated water, and the heated water is supplied to an intermediate cooler 10 through a second control valve 22. After the heat of the air having a relatively high pressure ratio from a low pressure air compressor 9 is taken again there, the resulting heated water is returned to the ice heat accumulator 18 to thaw the artificial ice. The air and high-pressure air are cooled by use of the artificial ice made by the ice heat accumulator 18 to increase the flow weight, so that the output of a gas turbine can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine plant and a coal gasification combined cycle power plant, and more particularly to a gas turbine plant and a coal gasification combined cycle which maintain a high output of a gas turbine even in summer when the temperature is high. It relates to a power plant.

[0002]

2. Description of the Related Art Recent gas turbine plants have been able to increase the output, for example, output of 150 MW or more, with the progress of technology, and have combined with a steam turbine plant a so-called combined cycle power plant, a coal gasifier and a steam turbine. Applied to the so-called coal gasification combined cycle power plant combined with the plant,
While accumulating a large number of operation results, it is playing a part in the stable supply of future electric power demand.

[0003] As described above, a gas turbine plant which is expected to be a part of stable supply of future power demand,
As shown in FIG. 5, a low-pressure air compressor 1, an intercooler 2,
The compressor includes a high-pressure air compressor 3, a gas turbine combustor 4, a low-pressure gas turbine 5, a reheat combustor 6, a high-pressure gas turbine 7, and a generator 8. The air at the intermediate pressure is subjected to heat exchange with the cooling water (CW) in the intercooler 2 to lower the temperature and increase its specific weight, and then compressed again by the high-pressure air compressor 3 to a high pressure. The high-pressure air is supplied to the gas turbine combustor 4 together with the fuel F to generate combustion gas, the combustion gas is heated again by the reheat combustor 6, and the high-temperature combustion gas is expanded by the high-pressure gas turbine 7, At this time, the generator 8 is rotationally driven by the generated rotational torque to generate electric power. When the NOx concentration of the generated combustion gas is high, the gas turbine combustor 4 supplies a medium such as water or steam to the combustion gas to lower the NOx concentration.

[0004] It is known that the output of a gas turbine plant fluctuates significantly under the influence of fluctuations in the temperature of the sucked atmospheric AR. For example, as shown in FIG. 6, the temperature of the atmosphere and the gas turbine output have an inversely proportional relationship.
Even if it is designed to be 0%, its output exceeds 100% at a winter temperature of 10 ° C., whereas its output drops to 90% at a summer temperature of 30 ° C. In summer, when the temperature rises, the gas turbine output decreases in inverse proportion to the fact that when the temperature is high, the specific weight of air decreases, and the gas turbine performs expansion work at the air flow rate of the reduced specific weight. Is the cause.

[0005] Further, when one day in summer is taken, the relationship between the atmospheric temperature and the power demand is as shown in FIG. 7, where the power demand is relatively low from midnight to morning, but from morning to evening. Electricity demand has increased significantly.

As described above, as a countermeasure against the power demand in summer, a technology for cooling the air sucked by an air compressor and increasing its specific weight to increase the output of the gas turbine has already been disclosed in Japanese Patent Application Laid-Open No. Hei 6 (1994) -106.
No. 307258 and Japanese Utility Model Laid-Open No. 6-87639.

[0007]

As the output of a gas turbine plant increases, the pressure ratio of the air compressor necessarily increases. Therefore, the air compressor is divided into two stages, one for low pressure and one for high pressure. It is common to install an intercooler in the area. In this case, the intercooler includes a cooling medium supply device that cools air having a relatively high pressure ratio from the low-pressure air compressor,
For example, a refrigerator is required.

[0008] However, the gas turbine plant must supply driving power to the cooling medium supply device.
In particular, when the industrial and consumer sectors are consuming a lot of power, such as in summer, supplying power to the cooling medium supply unit itself will not be able to supply power to the industrial and consumer sectors, thereby improving plant thermal efficiency. Considering fuel saving while trying to do so is not preferable.

Further, in the gas turbine plant, when power as power is supplied to a cooling medium supply device for supplying a cooling medium to an intercooler, the stage efficiency of the low-pressure air compressor divided into two stages is designed. If the gas turbine output falls below the design output, the gas turbine output will be lower than the design output.

[0010] The present invention has been made in view of such a point, and when cooling the air sucked by the air compressor, the cooled air is sucked into the air compressor without consuming any power and the gas is cooled. An object of the present invention is to provide a gas turbine plant and a coal gasification combined cycle power plant that improve turbine output.

[0011]

In order to achieve the above object, a gas turbine plant according to the present invention divides an air compressor into a low-pressure compressor and a high-pressure compressor. An intermediate cooler is provided between the low-pressure and high-pressure ones, and the gas turbine is divided into a low-pressure one and a high-pressure one.A reheat combustor is provided between the low-pressure one and the high-pressure one. In a gas turbine plant provided with a gas turbine combustor in the middle between a gas turbine and the gas turbine, the air conditioner is provided with an intake cooling unit.

According to a second aspect of the present invention, a gas turbine plant according to the present invention is provided.
An air compressor for low pressure is provided with an air cooler on the inlet side.

According to a third aspect of the present invention, a gas turbine plant according to the present invention is provided.
The intake cooling unit is characterized by being an ice regenerator.

According to a fourth aspect of the present invention, a gas turbine plant according to the present invention is provided.
The ice regenerator is formed as a closed circuit that supplies the generated cold water of ice making to an air cooler and an intermediate cooler, and recirculates the cold water that has cooled the air to melt the ice making.

According to a fifth aspect of the present invention, there is provided a gas turbine plant according to the present invention.
The air conditioner is divided into low pressure and high pressure, and an intermediate cooler is provided between the low pressure and high pressure, and the gas turbine is divided into low pressure and high pressure. A gas turbine provided with a gas turbine combustor in the middle of the air compressor and the gas turbine, and an air cooler provided on the inlet side of the air compressor, The air conditioner includes an intake cooling unit that supplies a cooling medium to the intercooler, and a humidifier and a regenerator provided between the high-pressure air compressor and the gas turbine combustor.

Further, in order to achieve the above object, a coal gasification combined cycle power plant according to the present invention has the following features.
In a coal gasification combined cycle power plant combining a gas turbine plant, an exhaust heat recovery boiler and a steam turbine plant, an intake cooling unit is provided in the gas turbine plant.

In order to achieve the above object, the coal gasification combined cycle power plant according to the present invention is configured such that the intake cooling unit includes an ice regenerator, an air cooler, and an intercooler. With the air cooler, the air supplied to the air compressor of the gas turbine plant is cooled by the cold water from the ice regenerator, and the intercooler is supplied from the air compressor to the gasifier of the coal gas plant. The supplied high-pressure air is cooled by cold water from the ice regenerator.

In order to achieve the above object, the coal gasification combined cycle power plant according to the present invention has an intake cooling unit applied to an air-blown coal gasification plant. is there.

In order to achieve the above object, in the coal gasification combined cycle power plant according to the present invention, the intake cooling unit is applied to an oxygen-blown coal gasification plant. .

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a gas turbine plant and a coal gasification combined cycle power plant according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic system diagram showing a first embodiment of a gas turbine plant according to the present invention.

The gas turbine plant according to this embodiment includes a low-pressure air compressor 9, an intercooler 10, a high-pressure air compressor 11, a gas turbine combustor 12, and a low-pressure gas turbine 1.
3, reheat combustor 14, high-pressure gas turbine 15, generator 1
6 and an intake cooling unit 17.

The intake cooling unit 17 includes an ice regenerator 18, a pump 19, and an air cooler 20, and cools the ice cold water generated by the ice regenerator 18 at night through the pump 19 and the first control valve 21. And heats the atmosphere AR to produce heated water. The heated water is supplied to the intercooler 10 via the second control valve 22, where it is compared again from the low-pressure air compressor 9. After removing the heat of the air having a high target pressure ratio, the heated water is returned to the ice regenerator 18 to melt the ice. The intake cooling unit 17 opens the third control valve 23 and the fourth control valve 24 according to the magnitude of the load on the gas turbine, and supplies the cold water from the ice regenerator 18 directly to the intercooler 10. ing.

On the other hand, the low-pressure air compressor 9 includes the air cooler 2
The air AR cooled at 0 was sucked and compressed into relatively high pressure air to an intermediate pressure, and the air at the intermediate pressure was subjected to heat exchange with cold water in the intercooler 10 to lower the temperature and increase its specific weight. Thereafter, the high-pressure air compressor 11 compresses the compressed air again to a high pressure, supplies the high-pressure air together with the fuel F to the gas turbine combustor 12 to generate combustion gas, and raises the temperature of the combustion gas again in the reheat combustor 14. The high-temperature combustion gas is expanded by the high-pressure gas turbine 15, and the generator 16 is rotated by the generated rotational torque to generate electric power. The gas turbine combustor 12
When the NOx concentration of the generated combustion gas is high, a medium such as water or steam is supplied to the combustion gas to lower the NOx concentration.

As described above, in the gas turbine plant according to the present embodiment, the low-pressure air compressor and the intercooler are provided with the intake cooling unit, and the cold water of the ice making generated from the ice regenerator of the intake cooling unit is used. Cooling the air and high-pressure air, increasing the flow weight and reducing the power supplied to the intake cooling unit, it is possible to maintain a high output as designed in the summer, and to the industrial and consumer sectors. Electric power can be supplied in a stable state.

FIG. 2 is a schematic system diagram showing a second embodiment of the gas turbine plant according to the present invention. The first
Parts that are the same as or correspond to the components of the embodiment are given the same reference numerals.

The gas turbine plant according to the present embodiment is provided with an intake cooling unit 17 for circulating cold water in the air cooler 20 and the intercooler 10 to lower the temperature of the atmosphere AR, increase the flow weight thereof, and reduce the compression. In addition to increasing the pressure of the air, a humidifier 25 and a regenerator 26 are provided to further increase the temperature of the compressed air, and the high-temperature compressed air is subjected to expansion work by the high-pressure gas turbine 15 to further increase the pressure. This is for output.

The intake cooling unit 17 supplies the cold water generated at night by the ice regenerator 18 to the air cooler 20 via the pump 19, where it becomes heated water that has taken the heat of the atmosphere AR. The water is again supplied to the intercooler 10 and removes the heat of the compressed air from the low-pressure air compressor 9 to become heated water again. The heated water is returned to the ice regenerator 18 to melt the ice. .

On the other hand, the low-pressure air compressor 9 includes the air cooler 2
The air AR cooled at 0 is compressed into compressed air of an intermediate pressure, and the compressed air is cooled by an intercooler 10 and supplied to a high-pressure air compressor 11 to increase the pressure, and the high-pressure air is humidified by a humidifier 25. The superheated steam is added to raise the temperature, and the high-temperature and high-pressure air is heated again by the regenerator 26 using the exhaust gas (exhaust heat) of the low-pressure gas turbine 13 as a heating source. The combustion gas is supplied to the reheat combustor 14 together with the fuel F, and the combustion gas is expanded by the high-pressure gas turbine 15. The combustion gas is subjected to expansion work in a low-pressure gas turbine 13, and the generator 1 is driven by the rotational torque generated during the expansion.
6 is driven to rotate to generate electric power.

As described above, in the gas turbine plant according to the present embodiment, the air AR is cooled by the intake cooling unit 17 to increase the flow rate weight, and the cooled air is compressed by the low / high pressure air compressors 9 and 10. The humidifier 25 added superheated steam to the high-pressure air to increase the flow rate weight again, and further heated the regenerator 26 to increase the temperature and pressure of the gas turbine driving gas to the high-pressure gas turbine 15. Therefore, the output of the gas turbine can be greatly increased as compared with the related art, and stable power can be supplied to the industrial and consumer sectors even when the temperature is high and the power consumption is severe as in summer.

FIG. 3 is a schematic system diagram showing an embodiment of a coal gasification combined cycle power plant according to the present invention in which a gas turbine plant is combined with a coal gasification plant, a steam turbine plant, and an exhaust gas recovery boiler.

In the coal gasification combined cycle power plant according to the present embodiment, the air compressor 28 of the gas turbine plant 27 is provided with the intake cooling unit 29 similarly to the first embodiment, and the air sucked by the air compressor 28 is provided. Is cooled to increase the flow weight thereof, and the high-pressure air compressed by the air compressor 28 is used as an oxidant in the coal gasification plant 30.
When the air is supplied to the chiller, the air is cooled by the intake air cooling unit 29 to increase the flow rate weight, thereby further increasing the output.

Recent combined cycle power plants use high-quality fuel, for example, LNG, to cope with the reduction of NOx concentration. However, the LNG is limited, and there is a risk of depletion of LNG. For this reason, a coal gasification combined cycle power plant that uses coal as a gas fuel by gasifying and refining coal has been realized, and is expected as a thermal power plant that will play a part in future fuel saving.

This coal gasification combined cycle power plant is, as shown in FIG.
0, a gas turbine plant 27, a steam turbine plant 31, and an exhaust heat recovery boiler 32.

The coal gasification plant 30 includes a booster 33,
Gasifier 34, gas cooler 35, gas cooler drum 3
6. A gas purifier 37 is provided, and high-pressure air as an oxidizing agent pressurized by the pressurizer 33 is supplied to the gasification furnace 34 together with the dried or slurryed coal, and a crude gas is generated here. Gas cooler 35 using sensible heat
Then, heat exchange is performed with the saturated water from the gas cooler drum 36, and the cooled crude gas is subjected to desulfurization, dedusting, denitrification, and the like by the gas purification device 37, and is supplied to the gas turbine plant 27 as gas fuel.

The gas turbine plant 27 includes an air compressor 28, a gas turbine combustor 38, and a gas turbine 3
9. Equipped with a generator 40, the air AR sucked by the air compressor 28 is compressed to a high pressure, the high-pressure air is supplied together with a gas fuel from a gas purifier 37, a combustion gas is generated, and the combustion gas is converted into a gas. The generator 40 is expanded by the turbine 39 to rotate the generator 40.

The exhaust heat recovery boiler 32 is accommodated in a casing 41, and is disposed in the superheater 4 in order along the flow of the gas turbine exhaust gas (exhaust gas) from the gas turbine 39.
2. An evaporator 44 and an economizer 45 communicating with the steam drum 43 are provided. Part of the saturated water generated by the economizer 45 is supplied to the gas cooler dome 36, and the rest is supplied to the steam drum 43, and The saturated steam from the gas cooler drum 36 is combined with the steam, and the combined steam is superheated by the superheater 42 and supplied to the steam turbine plant 31.

The steam turbine plant 31 includes a steam turbine 46, a generator 47, a condenser 48, and a feed water heater 4.
9. A deaerator 50 is provided, and the superheated steam from the superheater 42 is expanded by the steam turbine 46 to rotate the generator 47. The expanded turbine exhaust is condensed by the condenser 48, and the condensed water is heated by feed water. The water is regenerated by a vessel 49 to supply water, and the supplied water is deoxidized by a deaerator 50 and returned to the economizer 45.

On the other hand, the gas turbine plant 27 is provided with an intake cooling unit 29.

The intake cooling unit 29 includes an ice regenerator 51, an air cooler 52, and an intermediate cooler 53, and pumps ice cold water generated by the ice regenerator 51 at night to the pump 54 and the first control valve 5.
5, the air AR is cooled, the flow rate weight is increased by cooling the air AR, and the chilled water that has cooled the air AR is supplied to the intercooler 53 through the second control valve 56, and the air is compressed. A part of the high-pressure air from the unit 28 is cooled to increase its flow rate weight, and the cooled high-pressure air is supplied to the gasification furnace 34 as an air-blown oxidant via a booster 33. Reference numeral 57 denotes a third control valve, and reference numeral 58 denotes a fourth control valve. These control valves 57 and 58 are used according to the load of the gas turbine 39.

As described above, in the present embodiment, the air cooling unit 29 and the intercooler 53 are provided in the gas turbine plant 27 to cool the atmosphere AR and supply the air AR to the air compressor 28 whose flow rate weight is increased. Since a part of the high-pressure air of the air compressor 28 was cooled and its flow weight was increased and supplied to the gasification furnace 34 via the booster 33, the flow weight was as designed even when the temperature in summer was high. And electric power can be output, and stable power can be supplied to the industrial and consumer sectors.

FIG. 4 is a schematic system diagram showing a second embodiment of the coal gasification combined cycle power plant according to the present invention. The same reference numerals are given to the same or corresponding parts as the components of the first embodiment of the coal gasification combined cycle power plant, and redundant description will be omitted.

In the coal gasification combined cycle power plant according to the present embodiment, the oxidizing agent supplied to the coal gasification furnace 34 is acid-blown, and the atmospheric AR sucked by the booster 33 is compressed to a high pressure. The high-pressure air is supplied to an air separator 59 via an intercooler 53, where oxygen is separated, the oxygen gas is compressed by an oxygen compressor 60, the pressure is increased, and the oxygen gas is supplied to a gasification furnace 34. is there. In this case, the ice regenerator 51 provided in the gas turbine plant 27
Supplies the cold water of ice making generated at night to the air cooler 52 through the pump 54 and the first control valve 55, cools the atmospheric AR to increase its flow weight, and cools the cold water that has cooled the atmospheric AR 2 to the intercooler 53 via the control valve 56,
The high-pressure air from the booster 33 is cooled to increase the flow rate weight, the cooled water is returned to the ice regenerator 51, and the ice in the ice regenerator 51 is thawed.

As described above, also in this embodiment, the air AR supplied to the air compressor 28 is cooled by the air cooler 52 to increase the flow rate weight, and the oxygen supplied to the gasification furnace 34 is supplied to the intercooler 52. And the flow rate weight was increased, so that the electrical output according to the design value can be obtained even in summer.

[0045]

As described above, both the gas turbine plant and the coal gasification combined cycle power plant according to the present invention are provided with an intake cooling unit to cool the atmosphere and increase the flow rate weight. Supplied to the air compressors and gasifiers of coal gasification plants, so that it can produce electrical output as designed even when temperatures are high, such as in summer, and during the daytime when electricity demand in the industrial and consumer sectors is the highest, However, power can be supplied stably.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing a first embodiment of a gas turbine plant according to the present invention.

FIG. 2 is a schematic system diagram showing a second embodiment of the gas turbine plant according to the present invention.

FIG. 3 is a schematic system diagram showing a first embodiment of a coal gasification combined cycle power plant according to the present invention.

FIG. 4 is a schematic system diagram showing a second embodiment of a coal gasification combined cycle power plant according to the present invention.

FIG. 5 is a schematic diagram showing a conventional gas turbine plant.

FIG. 6 is a diagram showing a relationship between a gas turbine rotation torque (output) and the air temperature of the atmosphere.

FIG. 7 is a diagram showing the relationship between the air temperature of the atmosphere, the power demand, and the time of the day in summer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-pressure air compressor 2 Intercooler 3 High-pressure air compressor 4 Gas turbine combustor 5 Low-pressure gas turbine 6 Reheat combustor 7 High-pressure gas turbine 8 Generator 9 Low-pressure air compressor 10 Intercooler 11 High-pressure air compressor 12 Gas turbine combustor 13 Low pressure gas turbine 14 Reheat combustor 15 High pressure gas turbine 16 Generator 17 Intake cooling unit 18 Ice regenerator 19 Pump 20 Air cooler 21 First control valve 22 Second control valve 23 Third control valve 24 Fourth control valve 25 Humidifier 26 Regenerator 27 Gas turbine plant 28 Air compressor 29 Inlet cooling unit 30 Coal gasification plant 31 Steam turbine plant 32 Exhaust heat recovery boiler 33 Booster 34 Gasifier 35 Gas cooler 36 Gas cooler drum 37 Gas Generator 38 Gas turbine combustor 39 Gas turbine 40 Power generation Machine 41 Casing 42 Superheater 43 Steam drum 44 Evaporator 45 Economizer 46 Steam turbine 47 Generator 48 Condenser 49 Feedwater heater 50 Deerator 51 Ice regenerator 52 Air cooler 53 Intercooler 54 Pump 55 First control valve 56 Second Control valve 57 Third control valve 58 Fourth control valve

Claims (9)

[Claims] An air compressor is divided into a low pressure type and a high pressure type, an intermediate cooler is provided between the low pressure type and the high pressure type, and a gas turbine is divided into a low pressure type and a high pressure type. In a gas turbine plant having a reheat combustor in the middle between low pressure and high pressure, and a gas turbine combustor in the middle between the air compressor and the gas turbine, the air conditioner has an intake cooling unit. A gas turbine plant characterized by being provided. 2. The gas turbine plant according to claim 1, wherein the low-pressure air compressor is provided with an air cooler on an inlet side thereof. 3. The gas turbine plant according to claim 1, wherein the intake cooling unit is an ice regenerator. 4. The ice regenerator is formed as a closed circuit that supplies the produced ice-cooled water to an air cooler and an intermediate cooler, and recirculates the cooled water that has cooled the air to melt the ice. The gas turbine plant according to claim 3, wherein 5. An air conditioner is divided into a low pressure type and a high pressure type, an intermediate cooler is provided between the low pressure type and the high pressure type, and a gas turbine is divided into a low pressure type and a high pressure type. A gas turbine provided with a gas turbine combustor in the middle between the air compressor and the gas turbine, while having a reheat combustor in the middle between the low-pressure and high-pressure ones, provided on the inlet side of the air compressor. An air cooling unit that supplies a cooling medium to the air cooler and the intercooler; and a humidifier and a regenerator provided between the high-pressure air compressor and the gas turbine combustor. And a gas turbine plant. 6. A coal gasification combined cycle power plant combining a coal gasification plant, a gas turbine plant, an exhaust heat recovery boiler and a steam turbine plant, wherein the gas turbine plant is provided with an intake cooling unit. Coal gasification combined cycle power plant. 7. An intake cooling unit includes: an ice regenerator, an air cooler,
An intercooler is provided, and the air supplied to the air compressor of the gas turbine plant is cooled by the cold water from the ice regenerator by the air cooler, and the air compressor is supplied from the air compressor to the coal gas plant by the intercooler. The coal gasification combined cycle power plant according to claim 6, wherein high-pressure air supplied to the gasification furnace is cooled by cold water from the ice regenerator. 8. The coal gasification combined cycle power plant according to claim 6, wherein the intake cooling unit is applied to an air-blown coal gasification plant. 9. The coal gasification combined cycle power plant according to claim 6, wherein the intake cooling unit is applied to an oxygen-blown coal gasification plant.