CN107524527B - Gas turbine variable back pressure transformation system applicable to combined cycle power station - Google Patents
Gas turbine variable back pressure transformation system applicable to combined cycle power station Download PDFInfo
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- CN107524527B CN107524527B CN201710629936.4A CN201710629936A CN107524527B CN 107524527 B CN107524527 B CN 107524527B CN 201710629936 A CN201710629936 A CN 201710629936A CN 107524527 B CN107524527 B CN 107524527B
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- 230000009466 transformation Effects 0.000 title claims abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 70
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000003546 flue gas Substances 0.000 claims abstract description 44
- 239000002918 waste heat Substances 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 239000000779 smoke Substances 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 239000000446 fuel Substances 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000002407 reforming Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 7
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 206010022000 influenza Diseases 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013486 operation strategy Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/48—Control of fuel supply conjointly with another control of the plant
- F02C9/50—Control of fuel supply conjointly with another control of the plant with control of working fluid flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/48—Control of fuel supply conjointly with another control of the plant
- F02C9/50—Control of fuel supply conjointly with another control of the plant with control of working fluid flow
- F02C9/52—Control of fuel supply conjointly with another control of the plant with control of working fluid flow by bleeding or by-passing the working fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/48—Control of fuel supply conjointly with another control of the plant
- F02C9/50—Control of fuel supply conjointly with another control of the plant with control of working fluid flow
- F02C9/54—Control of fuel supply conjointly with another control of the plant with control of working fluid flow by throttling the working fluid, by adjusting vanes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a combined cycle back pressure changing transformation system of a gas turbine, which belongs to the field of power station energy conservation. The system mainly comprises a gas compressor, a combustion chamber, a gas turbine, a waste heat boiler, a draught fan flue, a draught fan bypass flue, a smoke bypass baffle, a chimney and the like. An induced draft fan flue and an induced draft fan bypass flue are arranged at a flue gas outlet of the waste heat boiler, a flue gas bypass baffle is arranged at the separation position of the two flues, an induced draft fan is arranged in the induced draft fan flue, and the gas pressure in the flue of the waste heat boiler is regulated by utilizing a method of regulating the power of the induced draft fan, so that the exhaust pressure of a gas turbine is changed; when the bypass flue baffle is closed to one side of the induced draft fan flue, the induced draft fan flue is closed, and the exhaust-heat boiler and the gas turbine outlet pressure can be completely recovered. Compared with the conventional combined cycle unit, the gas turbine has the advantages that the gas turbine has improved gas inlet and exhaust temperatures and optimized top cycle and bottom cycle efficiencies under the same load. The combined cycle variable backpressure reforming system of the gas turbine can optimize the operation economy of the combined cycle under the partial load working condition, remarkably improve the peak shaving performance of the combined cycle variable backpressure reforming system and has remarkable economic benefit.
Description
Technical Field
The invention belongs to the field of power station energy conservation, and particularly relates to a variable backpressure reforming system of a gas turbine, which can be used for a combined cycle power station.
Background
Gas turbines and their combined cycle are used in the power generation industry since the 50 s of the 20 th century; the gas-steam combined cycle unit is usually operated under a partial load working condition due to the peak shaving of the power grid, however, the thermal efficiency of the gas-steam combined cycle unit is correspondingly reduced along with the reduction of the load of the gas turbine, so that the deep research on the performance of the combined cycle full working condition has important theoretical and practical significance on the thermal economy of the unit.
The current method for improving the efficiency of the combined cycle variable working condition mainly comprises three methods of variable geometry adjustment, operation strategy adjustment and system integration; variable geometry adjustment includes compressor inlet guide vane adjustment (IGV) adjustment and turbine adjustable Nozzle (NGV) adjustment, and variable operating condition operation performance is improved mainly by changing the throughflow of the compressor and the turbine; optimizing the unit operation strategy adjustment, namely searching an optimal combined cycle variable working condition adjustment mode according to the thermodynamic characteristics of the combined cycle; in addition, the combined cycle efficiency, such as regenerative cycle, can be improved by utilizing the system integration, the air at the inlet of the compressor is heated by utilizing the high-temperature exhaust gas of the turbine, the temperature of the air entering the combustion chamber is improved, and the fuel input into the combustion chamber is reduced, so that the thermal efficiency is improved.
The gas turbine unit with higher parameter grade (high initial temperature and high pressure ratio) has better variable working condition performance; therefore, in the variable working condition operation range of the unit, the initial temperature of the fuel gas is as high as possible, which is beneficial to improving the combined cycle efficiency; the existing gas turbine units are provided with IGV systems, and the IGV regulation is a variable working condition regulation mode which is widely applied at present and has good effect; the load of the gas turbine is reduced by gradually closing the IGV angle and reducing the inlet flow of the gas compressor, so that the gas temperature of the turbine inlet can be improved to improve the variable working condition efficiency; however, the unit cannot always adjust the load by turning down the IGV angle because when the gas turbine is operated in an equal T3 adjustment, the unit is lowered to a load, and if the IGV angle is turned down further, the gas flow is further reduced, and the expansion ratio of the final stage of the turbine is reduced, which can cause the turbine exhaust to overheat.
The invention provides a variable back pressure reforming system of a gas turbine, which can be used for a combined cycle power station, is suitable for the combined cycle power station of the gas turbine, and has the following core design ideas: the exhaust back pressure of the turbine of the unit in variable working condition operation is regulated by arranging an induced draft fan at the tail flue of the waste heat boiler, the expansion ratio of the final stage of the turbine is improved, so that high-temperature fuel gas can be further expanded and do work in the turbine, the work output of the gas turbine is increased, and the top circulation performance is optimized; meanwhile, the inlet smoke temperature of the waste heat boiler is improved, and the bottom circulation performance is optimized; in order to facilitate the operation and the exit of the induced draft fan, an induced draft fan bypass flue connected with the induced draft fan flue in parallel is arranged, a bypass flue baffle is arranged at the flue separation part, when the induced draft fan is in operation, the induced draft fan bypass flue is closed, and smoke completely enters the induced draft fan flue. The combined cycle variable back pressure reforming system of the gas turbine can expand the load variation range of a unit adopting an equal T3 regulation strategy, improve the economy of variable working condition operation of the unit, and has obvious effects on power station energy conservation and peak regulation performance.
Disclosure of Invention
Aiming at the problems that the heat efficiency of the combined cycle variable working condition of the gas turbine is low, the air inflow of the gas compressor cannot be fully regulated by using an IGV when the unit adopts an equal T3 regulation strategy, and the like, the invention provides a variable back pressure reforming system of the gas turbine, which can be used for a combined cycle power station, and belongs to the field of power station energy conservation.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The system mainly comprises a compressor, a combustion chamber, a gas turbine, a waste heat boiler, a draught fan flue, a draught fan bypass flue, a flue gas bypass baffle, a chimney and other devices; the method is characterized in that: air enters the combustion chamber (2) after being compressed by the compressor (1), fuel enters the gas turbine (3) after being combusted in the combustion chamber, high-temperature flue gas is introduced into the waste heat boiler (4) after being expanded and worked in the turbine, an outlet flue gas channel of the waste heat boiler is respectively arranged into an induced draft fan flue (6) and an induced draft fan bypass flue (10) which are mutually connected in parallel, a bypass flue baffle (9) is arranged at a flue separation position, the bypass flue baffle (9) can be opened to a position (11) of the induced draft fan flue (6) and a position (12) of the induced draft fan bypass flue (10), an induced draft fan (7) is arranged in the induced draft fan flue (6), a converging flue (13) is arranged behind the induced draft fan flue (6) and the induced draft fan bypass flue (10), and the converging flue (13) is connected with a chimney (8).
The flue gas outlet flue of the waste heat boiler is provided with an induced draft fan flue (6), and the induced draft fan flue (6) is provided with an induced draft fan (7); the flue gas at the outlet of the waste heat boiler enters a draught fan flue (6), the flue gas flows through a draught fan (7) in the draught fan flue (6), the draught fan (7) is pressurized, the pressure is increased to be equivalent to the ambient pressure, and the flue gas enters a chimney (8) through a converging flue (13) and is discharged into the atmosphere; the suction force of the induced draft fan (7) is utilized to reduce the gas pressure at the outlets (14) of the waste heat boiler (4) and the gas turbine (3).
The flue gas outlet flue of the waste heat boiler is provided with an induced draft fan bypass flue (10), when the induced draft fan (7) is not put into operation, the flue gas enters the induced draft fan bypass flue (10), the pressure of the flue gas is not changed, then enters a converging flue (13), and finally is discharged into the atmosphere through a chimney (8); after the induced draft fan bypass flue (10) is arranged, whether the induced draft fan (7) is put into operation or not can be flexibly adjusted.
The separation part of the induced draft fan flue (6) and the induced draft fan bypass flue (10) behind the waste heat boiler (4) is provided with a bypass flue baffle (9), when the induced draft fan (7) is required to be put into operation, the bypass flue baffle (9) is adjusted to the position (12) of the induced draft fan bypass flue (10), the flue gas at the outlet of the waste heat boiler (4) enters the induced draft fan flue (6), is pressurized by the induced draft fan (7), enters the converging flue (13), and is discharged by the chimney (8); when the induced draft fan (7) is not required to be put into operation, the bypass flue baffle (9) is adjusted to the position (11) of the induced draft fan flue (6), and the flue gas at the outlet of the waste heat boiler (4) enters the induced draft fan bypass flue (10), then enters the converging flue (13) and is discharged from the chimney (8); when adjusting whether draught fan (7) put into operation, accessible bypass flue baffle (9) are nimble to be adjusted the flue gas passageway, avoid draught fan (7) not put into operation to cause resistance loss to the flue gas.
The variable back pressure reforming system of the gas turbine, which can be used for the combined cycle power station, has the following characteristics:
1. When the load of the combined cycle unit of the gas turbine is reduced from 100%, the IGV is adopted to adjust and control the air inflow of the gas compressor, the fuel quantity is adjusted, the gas temperature (T3) at the inlet of the turbine is kept unchanged, the induced draft fan is not put into operation, a bypass flue baffle is opened to the position (11), a induced draft fan flue is closed, smoke is discharged through the bypass flue of the induced draft fan, the induced draft fan is opened when the gas temperature of the turbine is reduced to a limit value along with the load, the bypass flue baffle is opened to the position (12), the induced draft fan flue is opened, the smoke is discharged after being pressurized by the induced draft fan, the gas turbine exhaust back pressure is changed through the power adjustment of the induced draft fan, and the high-temperature gas can be further expanded in the turbine, so that the gas temperature of the unit can still keep the gas temperature of the turbine within a safe range under the condition that the initial temperature of the turbine is unchanged; when the IGV angle is closed to the minimum value, a bypass flue baffle is opened to the position (11), a draught fan bypass flue is opened, the draught fan is closed, the flue gas is discharged through the draught fan bypass flue, the fuel quantity is adopted for adjusting, the inlet flow of the air compressor is not reduced any more, and the fuel quantity is continuously reduced to reduce the load; the air inflow of the air compressor is fully regulated by the IGV, the load range of equal T3 regulation is enlarged, the running performance of the top circulation and the bottom circulation under the variable working condition is optimized, and the variable working condition running economy of the unit is improved.
2. The turbine back pressure is reduced by using the induced draft fan, the expansion process of the flue gas in the turbine is expanded, the temperature of the flue gas at the inlet of the turbine can be maintained at a design value of 1327 ℃, the exhaust gas of the turbine is ensured not to be overtemperature, compared with a traditional unit, the expansion and the lifting of the flue gas utilization temperature zone of the turbine are realized, the turbine efficiency is greatly improved, meanwhile, the exhaust gas temperature of the turbine is correspondingly improved, the temperature is maintained at about 650 ℃, the improvement of the efficiency of a waste heat boiler is facilitated, and the operation economy of the unit is greatly improved.
3. The energy-saving effect of the system depends on the adjusting range of the flow of the compressor, and the energy-saving effect is more remarkable when the adjusting range is larger, so that the variable back pressure transformation still has the same thermal characteristics under different running schemes, different rotating speed adjustment and different system integration schemes, and particularly aims at strategies or integrated systems capable of bringing flow changes.
4. The system can flexibly change the flow path of the smoke through the adjustment of the baffle plate, so that the condition that the smoke continuously flows through the flue of the induced draft fan to cause excessive smoke pressure loss under the condition that the induced draft fan is not put into operation is avoided, and the economy of a unit is influenced.
5. The system can facilitate the maintenance of the induced draft fan, when the induced draft fan needs to be maintained, the induced draft fan flue is closed by the bypass flue baffle, and the induced draft fan can be unfolded and maintained under the condition that the operation of a unit is not influenced.
Drawings
FIG. 1 is a schematic diagram of a gas turbine combined cycle variable backpressure modification system. In the figure: 1-a compressor; 2-combustion chamber; 3-gas turbine; 4-a waste heat boiler; a 5-generator; 6-a draught fan flue; 7-induced draft fan; 8-chimney; 9-a bypass flue baffle; 10-a bypass flue of an induced draft fan; 11-;12-; 13-converging flues.
Detailed Description
The invention provides a combined cycle variable back pressure reforming system of a gas turbine. The description below refers to the accompanying drawings and examples.
In the schematic diagram of the variable back pressure reforming system of the gas turbine shown in fig. 1, the system mainly comprises a gas compressor, a combustion chamber, a gas turbine, a waste heat boiler, a draught fan flue, a draught fan bypass flue, a flue gas bypass baffle, a chimney and other devices; the method is characterized in that: air enters the combustion chamber (2) after being compressed by the compressor (1), fuel enters the gas turbine (3) after being combusted in the combustion chamber, high-temperature flue gas is introduced into the waste heat boiler (4) after being expanded and worked in the turbine, an outlet flue gas channel of the waste heat boiler is respectively arranged into an induced draft fan flue (6) and an induced draft fan bypass flue (10) which are mutually connected in parallel, a bypass flue baffle (9) is arranged at a flue separation position, the bypass flue baffle (9) can be opened to a position (11) of the induced draft fan flue (6) and a position (12) of the induced draft fan bypass flue (10), an induced draft fan (7) is arranged in the induced draft fan flue (6), a converging flue (13) is arranged behind the induced draft fan flue (6) and the induced draft fan bypass flue (10), and the converging flue (13) is connected with a chimney (8).
As shown in fig. 1, a draught fan flue (6) is arranged in a flue gas outlet flue of the waste heat boiler, and a draught fan (7) is arranged in the draught fan flue (6); flue gas at the outlet of the waste heat boiler enters a draught fan flue (6), the flue gas flows through a draught fan (7) in the draught fan flue (6), the draught fan (7) is pressurized, the pressure is increased to be equivalent to the ambient pressure, and the flue gas enters a chimney (8) through a converging flue (13) and is discharged into the atmosphere. The suction force of the induced draft fan (7) is utilized to reduce the gas pressure at the outlets (14) of the waste heat boiler (4) and the gas turbine (3).
As shown in fig. 1, a draught fan bypass flue (10) is arranged at a flue gas outlet flue of the waste heat boiler, when the draught fan (7) is not put into operation, the flue gas enters the draught fan bypass flue (10), the pressure of the flue gas does not change, then enters a converging flue (13), and finally is discharged into the atmosphere from a chimney (8); after the induced draft fan bypass flue (10) is arranged, whether the induced draft fan (7) is put into operation or not can be flexibly adjusted.
As shown in fig. 1, a bypass flue baffle (9) is arranged at the separation position of a draught fan flue (6) and a draught fan bypass flue (10) behind the waste heat boiler (4), when the draught fan (7) is required to be put into operation, the bypass flue baffle (9) is adjusted to the position (12) of the draught fan bypass flue (10), flue gas at the outlet of the waste heat boiler (4) enters the draught fan flue (6), is pressurized by the draught fan (7), enters a converging flue (13), and is discharged by a chimney (8); when the induced draft fan (7) is not required to be put into operation, the bypass flue baffle (9) is adjusted to the position (11) of the induced draft fan flue (6), the flue gas at the outlet of the waste heat boiler (4) enters the induced draft fan bypass flue (10), then enters the converging flue (13), and is discharged from the chimney (8). When adjusting whether draught fan (7) put into operation, accessible bypass flue baffle (9) are nimble to be adjusted the flue gas passageway, avoid draught fan (7) not put into operation to cause resistance loss to the flue gas.
The invention provides a combined cycle back pressure changing transformation system of a gas turbine for the first time; when the unit operates under a variable working condition by adopting an operation strategy regulated by an IGV (IGV) of a T < 3+ > compressor, a draught fan is started when the temperature of the exhaust gas of the turbine rises to a limit value along with the reduction of load, the back pressure of the turbine is reduced by using the draught fan, the expansion process of the flue gas in the turbine is enlarged, the temperature of the flue gas at the inlet of the turbine can be maintained at a design working condition value, and the exhaust gas of the turbine is ensured not to exceed the temperature, compared with the traditional unit, the expansion and the improvement of the utilization temperature area of the flue gas of the turbine are ensured, the turbine efficiency is greatly improved, and meanwhile, the exhaust gas temperature of the turbine is correspondingly improved, so that the improvement of the efficiency of a waste heat boiler is facilitated, and the operation economy of the unit is greatly improved; meanwhile, the system can ensure the economy of unit operation through the regulation of the baffle to the smoke flow path and ensure the convenience of maintenance of the induced draft fan through the closing and opening of the bypass flue baffle to the induced draft fan flue.
Claims (1)
1. The utility model provides a gas turbine that can be used to combined cycle power plant becomes backpressure transformation system, including compressor (1), combustion chamber (2), gas turbine (3), exhaust-heat boiler (4), induced draft fan flue (6), induced draft fan (7), induced draft fan bypass flue (10), bypass flue baffle (9) and chimney (8), characterized in that, air gets into combustion chamber (2) after compressor (1) compression, the high temperature flue gas that fuel produced after combustion chamber (2) combustion gets into gas turbine (3), high temperature flue gas lets in exhaust-heat boiler (4) after expanding acting in gas turbine (3), the export flue gas passageway of exhaust-heat boiler (4) sets up as induced draft fan flue (6) and induced draft fan bypass flue (10) that are connected in parallel each other respectively, set up bypass flue baffle (9) in the flue separation department, bypass flue baffle (9) can open to induced draft fan flue (6) position (11) or induced draft fan bypass flue (10) position (12), set up (7) in induced draft fan flue (6), set up and join flue (13) after induced draft fan flue (6) and induced draft fan bypass flue (10), join (8) chimney (8) connect;
When the high-temperature flue gas flows through the induced draft fan (7) in the induced draft fan flue (6), the induced draft fan (7) is pressurized, the pressure is increased to be equivalent to the ambient pressure, and the high-temperature flue gas enters the chimney (8) through the converging flue (13) and is discharged into the atmosphere; the suction force of the induced draft fan (7) is utilized to reduce the gas pressure at the outlets of the waste heat boiler (4) and the gas turbine (3);
The gas pressure at the outlets of the waste heat boiler (4) and the gas turbine (3) can be flexibly adjusted by adjusting the power of the induced draft fan (7) in the induced draft fan flue (6);
When the load of the combined cycle unit of the gas turbine is reduced from 100%, the IGV is adopted to adjust and control the air inflow of the gas compressor (1), the fuel quantity is adjusted at the same time, the turbine inlet gas temperature T3 is maintained unchanged, the induced draft fan (7) is not put into operation, a bypass flue baffle (9) is opened to the position (11) of the induced draft fan flue (6), the induced draft fan flue (6) is closed, the flue gas is discharged through the induced draft fan bypass flue (10), the induced draft fan (7) is opened when the turbine exhaust temperature rises to a limit value along with the reduction of the load, the bypass flue baffle (9) is opened to the position (12) of the induced draft fan bypass flue (10), the induced draft fan flue (6) is opened, the flue gas is discharged after being pressurized by the induced draft fan (7), the exhaust back pressure of the gas turbine (3) is changed through the adjustment of fan power, the high-temperature gas can be further expanded in the turbine, the exhaust temperature is reduced, and the turbine exhaust temperature can be kept within a safe range under the condition that the turbine exhaust temperature is unchanged; when the IGV angle is closed to the minimum value, a bypass flue baffle (9) is opened to a position (11) of a draught fan flue (6), a draught fan bypass flue (10) is opened, a draught fan (7) is closed, the smoke is discharged through the draught fan bypass flue (10), the fuel quantity is adopted for adjusting, the inlet flow of the air compressor (1) is not reduced any more, and the fuel quantity is continuously reduced to reduce the load; the air inflow of the air compressor (1) is fully regulated by the IGV, the load range of equal T3 regulation is enlarged, the running performance of top circulation and bottom circulation under variable working conditions is optimized, and the variable working condition running economy of the unit is improved.
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| CN201710629936.4A CN107524527B (en) | 2017-07-28 | 2017-07-28 | Gas turbine variable back pressure transformation system applicable to combined cycle power station |
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| CN201710629936.4A CN107524527B (en) | 2017-07-28 | 2017-07-28 | Gas turbine variable back pressure transformation system applicable to combined cycle power station |
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| CN107524527B true CN107524527B (en) | 2024-04-26 |
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| CN112516747A (en) * | 2020-12-21 | 2021-03-19 | 重庆科技学院 | Combined type natural gas compressor waste gas treatment device |
| CN114635801B (en) * | 2022-03-23 | 2023-11-21 | 合肥工业大学 | Back pressure characteristic optimization method and device for gas generator |
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| CN105020026A (en) * | 2015-06-24 | 2015-11-04 | 北京源深节能技术有限责任公司 | Fuel machine backpressure protection device |
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