CN219826984U - Gas-steam combined cycle system - Google Patents
Gas-steam combined cycle system Download PDFInfo
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- CN219826984U CN219826984U CN202321136019.XU CN202321136019U CN219826984U CN 219826984 U CN219826984 U CN 219826984U CN 202321136019 U CN202321136019 U CN 202321136019U CN 219826984 U CN219826984 U CN 219826984U
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- heat exchanger
- pipeline
- flue gas
- gas
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003546 flue gas Substances 0.000 claims abstract description 44
- 239000007789 gas Substances 0.000 claims abstract description 41
- 239000002918 waste heat Substances 0.000 claims description 11
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 5
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 238000010977 unit operation Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
Abstract
The utility model provides a gas-steam combined cycle system, includes gas turbine (1) and generator (7), exhaust-heat boiler (2), sets up flue gas heat exchanger (3) in exhaust-heat boiler's (2) exhaust-gas pipeline, the heat medium entry with the delivery port intercommunication of flue gas heat exchanger (3), the heat medium export with refrigerator (4) of the water inlet intercommunication of flue gas heat exchanger (3) for heat or reduce inlet gas turbine air temperature's heat exchanger (5), the water inlet pass through third pipeline (10) with the delivery port intercommunication of flue gas heat exchanger (3), the delivery port pass through fourth pipeline (11) with heat equipment (6) of the water inlet intercommunication of flue gas heat exchanger (3). According to the technical scheme provided by the utility model, the stability of the mass flow of the air entering the air compressor is maintained by adjusting the temperature of the air entering the air compressor, so that the potential safety hazard in the operation process of the gas turbine is eliminated, and the combustion efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of gas-steam combined cycle, in particular to a gas-steam combined cycle system.
Background
The gas-steam combined cycle power generation technology has been rapidly developed since the 90 s of the 20 th century. The combined gas-steam cycle power generation technology is a system which is formed by combining a gas turbine, a steam turbine, a waste heat utilization boiler and other thermodynamic equipment according to certain functional and technological requirements.
The main working principle is as follows: the heated natural gas enters a combustion chamber of the gas turbine and is mixed with high-pressure air pressed in by the gas compressor for combustion, so that high-temperature high-pressure air flow is generated to push the gas turbine to do work; the high-temperature gas discharged from the gas turbine enters a waste heat boiler to heat water into high-temperature high-pressure steam; the high-temperature high-pressure steam pushes the steam turbine to rotate to apply work, and the internal energy is converted into mechanical energy. At present, the J-type gas-steam combined cycle generator set has the combined cycle efficiency of about 64 percent, and if the combined cycle efficiency can recycle the waste heat of the flue gas, the combined cycle efficiency still has a further improvement room.
In general, the volumetric air flow at the compressor inlet of a gas turbine is designed to be constant, i.e., the volumetric air flow entering the compressor is also constant while the rotational speed of the compressor remains constant. The difference in air density can cause a large change in the compressor inlet air mass flow due to the difference in air density at different ambient temperatures. If the ambient temperature is reduced from 40 ℃ to-10 ℃, the mass air flow into the compressor can be increased by more than 18%. During operation of a gas turbine, air flow is typically limited by adjusting compressor Inlet Guide Vane (IGV) blade angles to control turbine outlet temperature substantially unchanged. Under lower ambient temperature such as winter, the air mass flow entering the air compressor is obviously increased, if the IGV opening and the synthetic gas mass flow are kept at higher ambient temperature such as summer, the low-frequency vibration of the combustion chamber is caused to be overlarge, which is not beneficial to the safe and stable operation of the gas turbine; on the other hand, at higher ambient temperature, such as summer, the mass flow of air entering the air compressor is obviously reduced, the unit operation load, and the power generation thermal efficiency and the power generation amount fluctuate greatly. The gas turbine is difficult to operate in a high-efficiency area under both working conditions, and the combustion efficiency is reduced.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides a gas-steam combined cycle system. The heat efficiency of the gas-steam combined cycle system can be improved, and the influence on the safe and stable operation of the gas turbine caused by the change of the mass flow of air entering the gas compressor due to the change of the ambient temperature is avoided.
In order to solve the technical problems, the gas-steam combined cycle system comprises a gas turbine and a generator driven by the gas turbine, a waste heat boiler connected with a flue gas pipe of the gas turbine, a flue gas heat exchanger arranged in a flue gas pipeline of the waste heat boiler, a refrigerating machine, an air inlet heat exchanger, a heat medium outlet and a heat utilization device, wherein the heat medium inlet is communicated with a water outlet of the flue gas heat exchanger through a first pipeline, the heat medium outlet is communicated with a water inlet of the flue gas heat exchanger through a second pipeline, the air inlet heat exchanger is used for heating or reducing the temperature of air entering the gas turbine, the water inlet is communicated with a water outlet of the flue gas heat exchanger through a third pipeline, the water outlet is communicated with a refrigerating liquid outlet of the refrigerating machine through a fourth pipeline, the water inlet of the air inlet heat exchanger is communicated with a refrigerating liquid outlet of the refrigerating machine through a fifth pipeline, the water outlet of the air inlet heat exchanger is communicated with a refrigerating liquid inlet of the refrigerating machine through a seventh pipeline, and the water outlet of the air inlet heat exchanger is communicated with the water inlet of the flue gas heat exchanger through an eighth pipeline; the first pipeline, the third pipeline, the sixth pipeline, the fifth pipeline and the eighth pipeline are all provided with regulating valves.
As a further improved technical scheme, the gas-steam combined cycle system provided by the utility model is characterized in that the water inlet of the gas inlet heat exchanger is also communicated with the water outlet of the flue gas heat exchanger through a ninth pipeline, and the ninth pipeline is provided with a regulating valve.
As a further improved technical scheme, the gas-steam combined cycle system provided by the utility model is characterized in that the refrigerator is a lithium bromide hot water type refrigerator.
The above described improvements may be implemented alone or in combination without conflict.
According to the technical scheme provided by the utility model, under a lower environmental temperature, the air entering the air compressor is heated, under a higher environmental temperature, the temperature of the air entering the air compressor is constant by cooling the air entering the air compressor, so that the stability of the mass flow of the air entering the air compressor is maintained, the potential safety hazard in the operation process of the gas turbine is eliminated, the optimal load and efficiency requirements of the gas turbine are met by adjusting the mass flow of the air entering the air compressor, the unit operation load, the power generation thermal efficiency and the power generation capacity can be stabilized, the gas turbine can be operated in a high-efficiency area, and the combustion efficiency is improved. At lower ambient temperature, the return water of the heat utilization equipment is utilized by the air inlet heat exchanger, so that the return water temperature entering the flue gas heat exchanger is further reduced, the air inlet temperature and efficiency of the gas turbine are improved, and meanwhile, the water inlet temperature of the flue gas heat exchanger is reduced, so that the heat recovery amount of the flue gas heat exchanger is improved, and the heat efficiency of the system is further improved.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model, and are not to be construed as limiting the utility model in any way. In the drawings:
FIG. 1 is a schematic diagram of an embodiment gas-steam combined cycle system.
Description of the embodiments
Embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.
The gas-steam combined cycle system shown in fig. 1 comprises a gas turbine 1 and a generator 7 driven by the gas turbine, a waste heat boiler 2 connected with a flue gas pipe of the gas turbine 1, a flue gas heat exchanger 3 arranged in a flue gas exhaust pipe of the waste heat boiler 2, a refrigerating machine 4 with a heat medium inlet communicated with a water outlet of the flue gas heat exchanger 3 through a first pipe 8 and a heat medium outlet communicated with a water inlet of the flue gas heat exchanger 3 through a second pipe 9, an air inlet heat exchanger 5 for heating or reducing the temperature of air entering the gas turbine, a water inlet communicated with a water outlet of the flue gas heat exchanger 3 through a third pipe 10, a heat utilization device 6 with a water outlet communicated with a water inlet of the flue gas heat exchanger 3 through a fourth pipe 11, a water inlet of the air inlet heat exchanger 5 communicated with a refrigerating liquid outlet of the refrigerating machine 4 through a fifth pipe 12, a water inlet of the air inlet heat exchanger 5 also communicated with a water outlet of the refrigerating machine 4 through a sixth pipe 13, a water outlet of the air inlet heat exchanger 5 communicated with a refrigerating liquid inlet of the refrigerating machine 4 through a seventh pipe 14, and a water outlet of the air inlet heat exchanger 5 also communicated with a water inlet of the flue gas inlet of the eighth pipe 15 through the air inlet heat exchanger 3; the first pipeline 8, the third pipeline 10, the sixth pipeline 13, the fifth pipeline 12 and the eighth pipeline 15 are all provided with regulating valves.
The flue gas heat exchanger 3 and the air inlet heat exchanger 5 are both plate heat exchangers with low resistance, and the refrigerator 4 is a lithium bromide hot water type refrigerator.
As one embodiment, the water inlet of the air inlet heat exchanger 5 is also communicated with the water outlet of the flue gas heat exchanger 3 through a ninth pipeline 16, and the ninth pipeline 16 is provided with a regulating valve.
Working principle: and the flue gas heat exchanger 3 is adopted to recycle the flue gas waste heat, so that the heat efficiency of the unit is further improved.
At a lower ambient temperature, the air inlet heat exchanger 5 utilizes the hot water generated by heat energy recovered by the flue gas heat exchanger 3 or the hot water used by the heat utilization equipment 6 to heat the air entering the gas turbine 1; at a higher ambient temperature, the refrigerator 4 utilizes the hot water generated by heat energy recovered by the flue gas heat exchanger 3 to generate chilled water, and the air inlet heat exchanger 5 utilizes the chilled water to cool the air entering the gas turbine 1, so that the temperature and the mass flow of the air entering the gas compressor are ensured to be stable.
According to the technical scheme provided by the utility model, under a lower environmental temperature, the air entering the air compressor is heated, under a higher environmental temperature, the temperature of the air entering the air compressor is constant by cooling the air entering the air compressor, so that the stability of the mass flow of the air entering the air compressor is maintained, the potential safety hazard in the operation process of the gas turbine is eliminated, the optimal load and efficiency requirements of the gas turbine are met by adjusting the mass flow of the air entering the air compressor, the unit operation load, the power generation thermal efficiency and the power generation capacity can be stabilized, the gas turbine can be operated in a high-efficiency area, and the combustion efficiency is improved. At lower ambient temperature, the air inlet heat exchanger 5 utilizes backwater of the heat utilization device 6 to further reduce backwater temperature entering the flue gas heat exchanger 3, and the air inlet temperature and efficiency of the gas turbine are improved, and meanwhile, the water inlet temperature of the flue gas heat exchanger 3 is reduced, so that the heat recovery amount of the flue gas heat exchanger 3 is improved, and the heat efficiency of the system is further improved.
It is apparent that the present utility model is not limited to the above preferred embodiments, but various changes and modifications can be made within the spirit of the present utility model as defined in the claims and specification, which can solve the same technical problems and achieve the intended technical effects, and thus is not repeated. All modifications which may occur to those skilled in the art from the present disclosure are intended to be included within the scope of the utility model as defined in the appended claims.
Claims (3)
1. A gas-steam combined cycle system comprising a gas turbine (1) and a generator (7) driven by the gas turbine, a waste heat boiler (2) connected to a flue gas pipe of the gas turbine (1), characterized in that: the system comprises a waste heat boiler (2), a flue gas heat exchanger (3) arranged in a flue gas exhaust pipeline of the waste heat boiler, a heat medium inlet is communicated with a water outlet of the flue gas heat exchanger (3) through a first pipeline (8), a heat medium outlet is communicated with a water inlet of the flue gas heat exchanger (3) through a second pipeline (9), an air inlet heat exchanger (5) for heating or reducing the temperature of air entering the gas turbine is arranged, the water inlet is communicated with the water outlet of the flue gas heat exchanger (3) through a third pipeline (10), the water outlet is communicated with a heat utilization device (6) which is communicated with the water inlet of the flue gas heat exchanger (3) through a fourth pipeline (11), the water inlet of the air inlet heat exchanger (5) is communicated with a refrigerating fluid outlet of the refrigerating fluid exchanger (4) through a fifth pipeline (12), the water inlet of the air inlet heat exchanger (5) is also communicated with the water outlet of the heat utilization device (6) through a sixth pipeline (13), the water outlet of the air inlet heat exchanger (5) is communicated with the refrigerating fluid inlet of the refrigerating fluid (4) through a seventh pipeline (14), and the water inlet of the flue gas heat exchanger (5) is also communicated with the refrigerating fluid inlet of the flue gas (3) through an eighth pipeline (15); the first pipeline (8), the third pipeline (10), the sixth pipeline (13), the fifth pipeline (12) and the eighth pipeline (15) are all provided with regulating valves.
2. The gas-steam combined cycle system according to claim 1, wherein: the water inlet of the air inlet heat exchanger (5) is also communicated with the water outlet of the flue gas heat exchanger (3) through a ninth pipeline (16), and the ninth pipeline (16) is provided with a regulating valve.
3. The gas-steam combined cycle system according to claim 1, wherein: the refrigerator (4) is a lithium bromide hot water type refrigerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321136019.XU CN219826984U (en) | 2023-05-12 | 2023-05-12 | Gas-steam combined cycle system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321136019.XU CN219826984U (en) | 2023-05-12 | 2023-05-12 | Gas-steam combined cycle system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219826984U true CN219826984U (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321136019.XU Active CN219826984U (en) | 2023-05-12 | 2023-05-12 | Gas-steam combined cycle system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219826984U (en) |
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2023
- 2023-05-12 CN CN202321136019.XU patent/CN219826984U/en active Active
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