CN115306557A - Energy storage type gas-air combined cycle power generation system and method based on Ericsson cycle - Google Patents
Energy storage type gas-air combined cycle power generation system and method based on Ericsson cycle Download PDFInfo
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- CN115306557A CN115306557A CN202211026170.8A CN202211026170A CN115306557A CN 115306557 A CN115306557 A CN 115306557A CN 202211026170 A CN202211026170 A CN 202211026170A CN 115306557 A CN115306557 A CN 115306557A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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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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- 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]
Abstract
An energy storage type gas-air combined cycle power generation system and method based on Ericsson cycle, wherein the power generation system comprises: the gas turbine power generation subsystem utilizes high-temperature and high-pressure flue gas generated by combustion of fuel in the gas turbine to push the turbine to do work and drive the generator to generate power; the air circulation power generation subsystem comprises an Ericsson circulation loop and a generator, utilizes high-temperature flue gas generated after a gas turbine does work to heat air to a constant temperature through heat exchange, and then expands to do work to drive the generator to generate power. The power generation system realizes the multi-stage utilization of energy, improves the energy supply structure and improves the thermal efficiency of the system. Wherein, in Ericsson circulation circuit, realized the energy storage function through set up high pressure gas holder behind high pressure compressor, the flow and the temperature developments of the flow that the during operation made the air that high pressure gas holder flowed out and flue gas match, can guarantee to stabilize the energy supply for the generator to guarantee that power generation system's generating efficiency maintains at the optimum level.
Description
Technical Field
The invention relates to the technical field of combined cycle power generation, in particular to an energy storage type gas-air combined cycle power generation system based on Ericsson (Chinese name: erichsen) cycle and a variable flow operation control method thereof.
Background
At present, the domestic power generation technology mainly adopts thermal power generation, can ensure the stable and reliable operation of a unit, but has the problems of environmental pollution and lower energy utilization rate. The problems of environmental pollution and resource shortage can be effectively avoided by new energy power generation modes such as wind power generation, solar power generation and the like, but the technologies have the defects of low energy density and intermittent power generation. In order to meet the requirement of electrical load and simultaneously avoid environmental pollution, the application provides a novel gas-air combined cycle power generation system which is mainly realized by a gas turbine and an air compressor. The demand difference of the user end to the electric load is large at different time periods, the load of the gas turbine and the air compressor is changed, frequent loading and unloading can cause premature failure of parts of the air compressor, and normal operation of the whole system can be influenced, so that the problem to be solved in the gas-air combined cycle power generation technology is solved.
Disclosure of Invention
The invention is made to solve the above problems, and an object of the invention is to provide an energy storage type gas-air combined cycle power generation system based on an Ericsson cycle and a variable flow operation control method thereof.
The invention provides an energy storage type gas-air combined cycle power generation system based on an Ericsson cycle, which is characterized by comprising the following components: the gas turbine power generation subsystem comprises a gas turbine and a first generator which are connected; the air circulation power generation subsystem comprises an Ericsson circulation loop and a generator, wherein the Ericsson circulation loop takes air as a working medium and comprises a power generation passage, a cooling passage and a regenerative heat exchanger, the power generation passage is connected with the gas turbine and the generator and is used for heating the air by utilizing the waste heat of the flue gas exhausted by the gas turbine, then expanding to do work and providing mechanical energy for the generator, the cooling passage is used for cooling and compressing the air, the regenerative heat exchanger enables the power generation passage and the cooling passage to be communicated to form a circulation loop and is used for exchanging heat between the air expanded to do work in the power generation passage and the air cooled and compressed in the cooling passage; the cooling passage is internally provided with a high-pressure compressor and a high-pressure air storage tank which are sequentially communicated along the air flow direction, and the flow of air flowing out of the high-pressure air storage tank is dynamically adjusted according to the flow and the temperature of flue gas discharged by the gas turbine.
In the energy storage type gas-air combined cycle power generation system based on the Ericsson cycle provided by the invention, the energy storage type gas-air combined cycle power generation system also has the following characteristics: the power generation path comprises a high-pressure heat exchanger, a high-pressure expander, a low-pressure heat exchanger and a low-pressure expander, the heat release side of the high-pressure heat exchanger and the heat release side of the low-pressure heat exchanger are respectively communicated with an exhaust port of the gas turbine, and the heat absorption side of the high-pressure heat exchanger, the high-pressure expander, the heat absorption side of the low-pressure heat exchanger and the low-pressure expander are sequentially communicated; the heat release side of the regenerative heat exchanger is communicated with the low-pressure expander, and the heat absorption side of the regenerative heat exchanger is communicated with the heat absorption side of the high-pressure heat exchanger; the generator comprises a second generator and a third generator, the second generator is connected with the high-pressure expansion machine, and the third generator is connected with the low-pressure expansion machine.
In the energy storage type gas-air combined cycle power generation system based on the Ericsson cycle provided by the invention, the energy storage type gas-air combined cycle power generation system also has the following characteristics: the cooling passage also comprises a low-pressure cooler, a low-pressure air storage tank, a low-pressure compressor and a high-pressure cooler which are sequentially communicated along the air flow direction, and the high-pressure cooler is communicated with the high-pressure compressor; the heat release side of the regenerative heat exchanger is communicated with the low-pressure cooler, and the heat absorption side of the regenerative heat exchanger is communicated with the high-pressure air storage tank.
In the energy storage type gas-air combined cycle power generation system based on the Ericsson cycle, the invention can also have the following characteristics: an air outlet pipeline connected with the high-pressure air storage tank is provided with an air outlet throttle valve for adjusting air outlet flow.
Furthermore, an air outlet pipeline connected with the low-pressure air storage tank is provided with an air outlet throttle valve for adjusting air outlet flow.
In the energy storage type gas-air combined cycle power generation system based on the Ericsson cycle provided by the invention, the energy storage type gas-air combined cycle power generation system also has the following characteristics: further comprising: the flow sensor is used for monitoring the flow of the flue gas discharged by the gas turbine; the temperature sensor is used for monitoring the temperature of the flue gas discharged by the gas turbine; and a controller for controlling the opening of the exhaust throttle valve based on signals of the flow sensor and the temperature sensor.
The invention also provides a variable flow operation control method of the energy storage type gas-air combined cycle power generation system based on the Ericsson cycle, which comprises the following steps: when the gas turbine of the gas turbine power generation subsystem operates in a variable load mode, the flow of air flowing out of the high-pressure air storage tank is dynamically adjusted according to the flow and the temperature of flue gas exhausted by the gas turbine, so that the air can always reach a set value when the temperature is raised by utilizing the waste heat of the flue gas.
Action and Effect of the invention
According to the energy storage type gas-air combined cycle power generation system based on the Ericsson cycle and the variable flow operation control method thereof, because the power generation system comprises a gas turbine power generation subsystem and an air cycle power generation subsystem, the gas turbine power generation subsystem utilizes high-temperature and high-pressure flue gas generated by fuel combustion in a gas turbine to push the turbine to do work and drive the generator to generate power, and the air cycle power generation subsystem utilizes the high-temperature flue gas generated after the gas turbine does work, the air is heated to a fixed temperature through heat exchange, and then the air is expanded to do work and drive the generator to generate power, therefore, the invention realizes the multi-stage utilization of energy, improves the energy supply structure, improves the thermal efficiency of the system, and does not cause environmental pollution while meeting the electric load demand; because the air circulation power generation subsystem adopts an Ericsson circulation loop to supply power to the generator, in the Ericsson circulation loop, the energy storage function is realized by arranging the high-pressure air storage tank behind the high-pressure compressor, and during working, the flow of air flowing out of the high-pressure air storage tank is adjusted to be dynamically matched with the flow and the temperature of flue gas exhausted by the gas turbine, so that the stable power supply to the generator can be ensured.
Drawings
FIG. 1 is a schematic diagram of an energy storage gas-air combined cycle power generation system based on the Ericsson cycle in an embodiment of the present invention.
Description of reference numerals:
1, a gas turbine; 2 a first generator; 3 a second generator; 4 a third generator; 5, a high-pressure heat exchanger; 6, a high-pressure expansion machine; 7, a low-pressure heat exchanger; 8, a low-pressure expander; 9, a regenerative heat exchanger; 10 low-pressure cooler; 11 a low pressure gas tank; 12 a low pressure compressor; 13 high-pressure cooler; 14 a high pressure compressor; 15 high-pressure gas storage tank.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following embodiments are specifically described with reference to the attached drawings.
Examples
FIG. 1 is a schematic diagram of an energy storage gas-air combined cycle power generation system based on an Ericsson cycle.
As shown in FIG. 1, the present embodiment provides an energy storage type gas-air combined cycle power generation system based on an Ericsson cycle, which includes a gas turbine power generation subsystem and an air cycle power generation subsystem.
The gas turbine power generation subsystem comprises a gas turbine 1 and a first generator 2, and an output shaft of the gas turbine 1 is connected with the first generator 2. When the gas turbine works, high-temperature and high-pressure flue gas generated by combustion of fuel in the gas turbine 1 pushes the turbine to do work, and the first generator 2 is driven to generate electricity.
The air cycle power generation subsystem comprises an Ericsson cycle loop using the flue gas discharged by the gas turbine 1 as a heat source, a second generator 3 and a third generator 4. The Ericsson circulation loop generates electricity by using the flue gas discharged by the gas turbine 1 through processes of approximately isothermal compression, isothermal expansion, isobaric heat absorption and isobaric heat release based on an Ericsson circulation principle.
The Ericsson cycle loop includes a high pressure heat exchanger 5, a high pressure expander 6, a low pressure heat exchanger 7, a low pressure expander 8, a recuperative heat exchanger 9, a low pressure cooler 10, a low pressure gas tank 11, a low pressure compressor 12, a high pressure cooler 13, a high pressure compressor 14, and a high pressure gas tank 15. Specifically, the heat release side of the high-pressure heat exchanger 5 and the heat release side of the low-pressure heat exchanger 7 are respectively communicated with an exhaust port of the gas turbine 1, the heat absorption side of the high-pressure heat exchanger 5, the high-pressure expander 6, the heat absorption side of the low-pressure heat exchanger 7 and the low-pressure expander 8 are sequentially communicated to form a power generation passage, an output shaft of the high-pressure expander 6 is connected with the second power generator 3, and an output shaft of the low-pressure expander 8 is connected with the third power generator 4. The low-pressure cooler 10, the low-pressure air storage tank 11, the low-pressure compressor 12, the high-pressure cooler 13, the high-pressure compressor 14 and the high-pressure air storage tank 15 are communicated in sequence to form a cooling passage. The heat release side of the regenerative heat exchanger 9 is communicated with the low-pressure expander 8 and the low-pressure cooler 10, the heat absorption side of the regenerative heat exchanger 9 is communicated with the heat absorption side of the high-pressure heat exchanger 5 and the high-pressure air storage tank 15, and the regenerative heat exchanger 9 enables the power generation passage and the cooling passage to form a circulation loop.
Wherein the actual expansion process is brought close to an isothermal process by the arrangement of the low pressure heat exchanger 7 between the high pressure expander 6 and the low pressure expander 8.
By arranging a high-pressure cooler 13 between the low-pressure compressor 12 and the high-pressure compressor 14, the actual compression process is brought close to an isothermal process.
By arranging the low-pressure cooler 10 between the regenerative heat exchanger 9 and the low-pressure air tank 11, the air flowing out of the low-pressure expander 8 through the regenerative heat exchanger 9 is cooled to a set temperature and then stored in the low-pressure air tank 11.
Through arranging high-pressure air storage tank 15 behind high-pressure compressor 14 in series, make high-pressure air store in high-pressure air storage tank 15, realized the energy storage function for the air flow of Ericsson circulation circuit can carry out the developments with the flow and the temperature of the gas turbine 1 exhaust flue gas and match, thereby guarantees electric load's stable output.
Further, in order to dynamically adjust the air flow of the Ericsson cycle, in this embodiment, an exhaust throttle valve is installed on an outlet pipe connected to the high-pressure air tank 15, and a flow sensor for monitoring the flow rate of the flue gas discharged from the gas turbine 1, a temperature sensor for monitoring the temperature of the flue gas discharged from the gas turbine 1, and a controller for controlling the opening degree of the exhaust throttle valve according to signals of the flow sensor and the temperature sensor are further configured. Of course, an exhaust throttle valve may be installed in the outlet pipe to which the low pressure gas tank 11 is connected.
The specific working process of the air circulation power generation subsystem is as follows: firstly, part of the flue gas waste heat of the gas turbine 1 is transmitted to the air through the high-pressure heat exchanger 5, so that the temperature of the air is raised to T0, then the air does work in the high-pressure expansion machine 6, and the second generator 3 is driven to output electric load to the outside. Then, the air after applying work from the high-pressure expander 6 exchanges heat with another part of high-temperature flue gas from the gas turbine 1 in the low-pressure heat exchanger 7, so that the temperature of the air is increased to T0 again, then the air flows into the low-pressure expander 8 to apply work, and the third generator 4 is driven to output electric load to the outside. After working in the low-pressure expander 8, the low-pressure medium-temperature air with the temperature and pressure reduced to T3 and P3 enters the regenerative heat exchanger 9, heat is transferred to the cold-end air before entering the high-pressure heat exchanger 5, the temperature of the cold-end air is reduced to T4, and meanwhile the temperature of the cold-end air is increased to T2. Then, the air from the regenerative heat exchanger 9 enters a low-pressure cooler 10, is cooled to T1, and is sent to a low-pressure air tank 11. Then, the low-temperature and low-pressure air in the low-pressure air storage tank 11 flows to the low-pressure compressor 12 to be compressed, enters the high-pressure cooler 13 to be cooled after being compressed to a certain pressure P1, enters the high-pressure compressor 14 to be compressed again after being cooled to a temperature T1, and enters the high-pressure air storage tank 15 to be stored after being compressed to a certain pressure P2. Thus, the gas-air combined cycle power generation is realized.
The variable flow operation control method of the energy storage type gas-air combined cycle power generation system based on Ericsson cycle comprises the following steps: when the gas turbine 1 of the gas turbine power generation subsystem operates in a variable load mode, the flow of air flowing out of the high-pressure air storage tank 15, namely the air flow of an Ericsson circulation loop of the air circulation power generation subsystem, is dynamically calculated and adjusted according to the flow and the temperature of flue gas discharged by the gas turbine 1, so that the air can always reach a set value when heated by using waste heat of the flue gas, namely the air temperatures at the heat absorption side outlets of the high-pressure heat exchanger 5 and the low-pressure heat exchanger 7 reach a set value T0, the air entering the high-pressure expander 6 and the low-pressure expander 8 keep constant temperatures, the high-pressure expander 6 and the low-pressure expander 8 respectively provide stable mechanical energy for the second power generator 3 and the third power generator 4, the second power generator 3 and the third power generator 4 stably output electric loads outwards, and the power generation efficiency of the gas-air combined cycle power generation system keeps an optimal level.
Effects and effects of the embodiments
According to the energy storage type gas-air combined cycle power generation system based on Ericsson cycle, the energy storage type gas-air combined cycle power generation system comprises a gas turbine power generation subsystem and an air cycle power generation subsystem, the gas turbine power generation subsystem utilizes high-temperature and high-pressure flue gas generated by fuel combustion in a gas turbine to push a turbine to do work and drive a generator to generate power, the air cycle power generation subsystem utilizes the high-temperature flue gas generated after the gas turbine does work, air is heated to a fixed temperature through heat exchange, and then expansion work is performed to drive the generator to generate power, so that the power generation system realizes multi-stage utilization of energy, improves an energy supply structure, improves heat efficiency, and does not cause environmental pollution while meeting the demand of electric load; because the air circulation power generation subsystem adopts the Ericsson circulation loop to supply energy to the generator, in the Ericsson circulation loop, the energy storage function is realized by arranging the high-pressure air storage tank behind the high-pressure compressor, during operation, the flow of air flowing out of the high-pressure air storage tank is adjusted, so that the air storage tank is dynamically matched with the flow and the temperature of flue gas exhausted by the gas turbine, and stable energy supply to the generator can be ensured.
The structure of the power generation passage, the structure of the cooling passage and the connection relationship between the power generation passage and the cooling passage and the regenerative heat exchanger are described in the embodiments, and the detailed description is omitted here.
The adjustment of the air flow of the Ericsson circulation loop can be realized by adjusting the opening of an exhaust throttle valve connected with a high-pressure air storage tank, and a flow sensor, a temperature sensor and a controller can be configured to realize automatic monitoring and adjustment. In addition, an exhaust throttle valve can be arranged on an air outlet pipeline connected with the low-pressure air storage tank so as to realize the adjustment of the air flow of the Ericsson circulating loop.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (7)
1. An energy storage type gas-air combined cycle power generation system based on an Ericsson cycle, comprising:
the gas turbine power generation subsystem comprises a gas turbine and a first generator which are connected; and
the air circulation power generation subsystem comprises an Ericsson circulation loop and a generator, wherein the Ericsson circulation loop takes air as a working medium and comprises a power generation passage, a cooling passage and a regenerative heat exchanger, the power generation passage is connected with the gas turbine and the generator and is used for heating the air by using the waste heat of the flue gas exhausted by the gas turbine and then expanding and applying work to provide mechanical energy for the generator, the cooling passage is used for cooling and compressing air, and the regenerative heat exchanger enables the power generation passage and the cooling passage to be communicated to form a circulation loop and is used for exchanging heat between the air expanded and applied work in the power generation passage and the air cooled and compressed in the cooling passage;
the cooling passage is internally provided with a high-pressure compressor and a high-pressure air storage tank which are sequentially communicated along the air flow direction, and the flow of air flowing out of the high-pressure air storage tank is dynamically adjusted according to the flow and the temperature of flue gas discharged by the gas turbine.
2. An Ericsson cycle based energy storage gas-air combined cycle power generation system according to claim 1, wherein:
the power generation passage comprises a high-pressure heat exchanger, a high-pressure expander, a low-pressure heat exchanger and a low-pressure expander, the heat release side of the high-pressure heat exchanger and the heat release side of the low-pressure heat exchanger are respectively communicated with an exhaust port of the gas turbine, and the heat absorption side of the high-pressure heat exchanger, the high-pressure expander, the heat absorption side of the low-pressure heat exchanger and the low-pressure expander are sequentially communicated;
the heat release side of the regenerative heat exchanger is communicated with the low-pressure expander, and the heat absorption side of the regenerative heat exchanger is communicated with the heat absorption side of the high-pressure heat exchanger;
the generators include a second generator coupled to the high pressure expander and a third generator coupled to the low pressure expander.
3. The Ericsson cycle based energy storage gas-air combined cycle power generation system according to claim 1 or 2, wherein:
the cooling passage also comprises a low-pressure cooler, a low-pressure air storage tank, a low-pressure compressor and a high-pressure cooler which are sequentially communicated along the air flow direction, and the high-pressure cooler is communicated with the high-pressure compressor;
and the heat release side of the regenerative heat exchanger is communicated with the low-pressure cooler, and the heat absorption side of the regenerative heat exchanger is communicated with the high-pressure gas storage tank.
4. The Ericsson cycle based energy storage gas-air combined cycle power generation system of claim 3, wherein:
and an exhaust throttle valve for adjusting the outlet flow is arranged on an outlet pipeline connected with the high-pressure gas storage tank.
5. The Ericsson cycle based energy storage gas-air combined cycle power generation system of claim 4, wherein:
and an exhaust throttle valve for regulating the outlet flow is arranged on an outlet pipeline connected with the low-pressure gas storage tank.
6. The Ericsson cycle based energy storage gas-air combined cycle power generation system of claim 4 or 5, further comprising:
the flow sensor is used for monitoring the flow of the flue gas discharged by the gas turbine;
a temperature sensor for monitoring the temperature of the flue gas discharged by the gas turbine;
and a controller for controlling the opening of the exhaust throttle valve according to signals of the flow sensor and the temperature sensor.
7. A variable flow operation control method of an energy storage type gas-air combined cycle power generation system based on an Ericsson cycle according to any one of claims 1 to 6, characterized by comprising the following steps:
when the gas turbine of the gas turbine power generation subsystem operates in a variable load mode, the flow of air flowing out of the high-pressure air storage tank is dynamically adjusted according to the flow and the temperature of flue gas exhausted by the gas turbine, so that the air can always reach a set value when the temperature is raised by utilizing the waste heat of the flue gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211026170.8A CN115306557A (en) | 2022-08-25 | 2022-08-25 | Energy storage type gas-air combined cycle power generation system and method based on Ericsson cycle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211026170.8A CN115306557A (en) | 2022-08-25 | 2022-08-25 | Energy storage type gas-air combined cycle power generation system and method based on Ericsson cycle |
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