CN113623039B - Air-carbon dioxide combined cycle power generation system and method - Google Patents
Air-carbon dioxide combined cycle power generation system and method Download PDFInfo
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- CN113623039B CN113623039B CN202111095524.XA CN202111095524A CN113623039B CN 113623039 B CN113623039 B CN 113623039B CN 202111095524 A CN202111095524 A CN 202111095524A CN 113623039 B CN113623039 B CN 113623039B
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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Abstract
The invention discloses an air-carbon dioxide combined cycle power generation system and method. An air-carbon dioxide combined cycle power generation system comprises an air secondary reheating cycle power generation system and a supercritical carbon dioxide reheating cycle power generation system. An air-carbon dioxide combined cycle power generation method comprises an air secondary reheating cycle power generation method and a supercritical carbon dioxide reheating cycle power generation method. According to the invention, the air secondary reheating cycle power generation system is superimposed on the recently emerging supercritical carbon dioxide cycle power generation system, so that the cascade utilization of the combustion energy of the fuel in the boiler is realized, and the economy of the cycle power generation of the thermal power plant is improved. In addition, no matter the air secondary reheating cycle power generation system or the supercritical carbon dioxide reheating cycle power generation system adopts the cycle working medium which is not water or water vapor, so that the selection of a high-efficiency clean power generation mode is increased for vast water-deficient areas in China.
Description
Technical Field
The invention belongs to the technical field of power generation equipment, and particularly relates to an air-carbon dioxide combined cycle power generation system and method.
Background
Air is used as a circulating working medium in a power plant less, but in consideration of the characteristic that air can be continuously discharged into a boiler furnace to participate in fuel combustion after the air turbine does work, in addition, compared with the traditional power plant, the water or water vapor used as the circulating working medium has the advantages that facilities such as a large cooling tower, a circulating water pump and a circulating water pipeline are required to be built, and the air turbine can not be built. At present, less researches are conducted on air as a circulating working medium of a power plant, but researches on power generation by adopting air as the circulating working medium in other fields except the power plant are primarily involved. In chinese patent publication No. CN213684392, when the date of authority is 2021, 07, 13, a strong wind generated during the driving process of the vehicle is used to generate electricity, and the electric energy is stored in the electric storage module to provide electric power for the 5G micro base station. The device utilizes strong wind generated by the vehicle in the running process to generate electricity, and the strong wind generated by the vehicle in the running process is limited by the engine power of the vehicle, so that the device can only be applied to miniaturization by utilizing air to generate electricity. The large-scale power plant-level applications for generating electricity using air turbines are also relatively few. The invention is also provided for the first time in the invention, wherein the combined cycle power generation of air secondary reheating and supercritical carbon dioxide backheating is adopted in the thermal power plant to improve the cycle heat efficiency, and the exhaust gas of the high-pressure air turbine enters the boiler hearth for multiple times for multiple reheating.
In summary, there is no universal and convenient and reliable power generation scheme for the power generation attempt of the combined cycle power generation system and method adopting the air double reheat-supercritical carbon dioxide regenerative heat in the thermal power plant.
Disclosure of Invention
The invention aims to provide an air-carbon dioxide combined cycle power generation system and method which are high in efficiency, low in investment and applicable to water-deficient areas in China.
The invention is realized by adopting the following technical scheme:
an air-carbon dioxide combined cycle power generation system comprises an air secondary reheating cycle power generation system and a supercritical carbon dioxide reheating cycle power generation system;
the air double reheat cycle power generation system comprises: the air preheater is arranged at the highest temperature in the boiler hearth, is coaxially connected with the high-pressure air turbine, is used for taking away heat carried by compressed air in the low-pressure air compressor, and also comprises the high-pressure air preheater, the high-pressure air turbine, the medium-pressure air reheater, the medium-pressure air turbine, the low-pressure air reheater, the low-pressure air turbine and pipelines connected with all devices, wherein the high-pressure air preheater, the high-pressure air turbine, the medium-pressure air reheater, the medium-pressure air turbine, the low-pressure air reheater and the pipelines are connected with the high-pressure air compressor in sequence according to air flow directions; the high-pressure air preheater, the medium-pressure air reheater and the low-pressure air reheater are arranged in the boiler furnace; the outlet of the low-pressure air turbine is positioned in the boiler hearth;
the supercritical carbon dioxide regenerative cycle power generation system comprises: the supercritical carbon dioxide preheater is arranged at the lowest temperature of a boiler hearth, and the supercritical carbon dioxide turbine, the heat regenerator, the supercritical carbon dioxide condenser, the supercritical carbon dioxide compressor, the inter-compressor-stage cooler and the pipelines connected with all the devices are sequentially arranged at the outlet of the supercritical carbon dioxide preheater according to the supercritical carbon dioxide flow direction, wherein the heat absorption side of the inter-compressor-stage cooler is the flow of supercritical carbon dioxide, and the heat absorption side is the flow of low-pressure compressor outlet air; the second generator is coaxially connected with the supercritical carbon dioxide turbine.
The invention is further improved in that the high-pressure air preheater, the medium-pressure air reheater and the low-pressure air reheater are tubular air preheaters or reheaters, the tubular sides of which can bear the outlet air pressure of the high-pressure compressor, the exhaust pressure of the high-pressure air turbine and the exhaust pressure of the medium-pressure air turbine respectively.
The invention further improves that the supercritical carbon dioxide preheater is a tubular supercritical carbon dioxide preheater with a tube side capable of bearing the supercritical carbon dioxide pressure at the outlet of the supercritical carbon dioxide compressor.
A further improvement of the invention is that the flow direction of the cold and hot fluid in the regenerator is arranged in a counter-current manner.
A further development of the invention is that the cold-hot fluid flow direction in the inter-compressor stage cooler is arranged in a countercurrent manner.
The invention further improves that the invention also comprises a feeder for conveying fuel to the boiler furnace, wherein the fuel in the feeder is comprehensively considered according to the characteristics of local fuel or the price factor of the fuel, and biomass, municipal refuse, natural gas and light diesel oil are selected to replace the fuel.
The invention further improves that the high-pressure air turbine, the medium-pressure air turbine and the low-pressure air turbine can be increased or decreased according to the actual expansion process, when the low-pressure air turbine is decreased, the exhaust gas of the medium-pressure air turbine can be discharged into a boiler hearth through proper diffusion, when the medium-pressure air turbine and the low-pressure air turbine are decreased, the exhaust gas of the high-pressure air turbine can be discharged into the boiler hearth through proper diffusion, when the air turbine is increased after the low-pressure air turbine, the exhaust gas of the high-pressure air turbine and the low-pressure air turbine can be sequentially arranged according to the arrangement mode of the high-pressure air turbine, the medium-pressure air turbine and the low-pressure air turbine.
The air-carbon dioxide combined cycle power generation method is based on the air-carbon dioxide combined cycle power generation system, and comprises an air secondary reheating cycle power generation method and a supercritical carbon dioxide regenerative cycle power generation method, wherein the air secondary reheating cycle power generation method comprises the following steps:
air enters the low-pressure compressor through the low-pressure compressor inlet pipeline to be compressed;
the compressed air in the low-pressure compressor enters the inter-compressor cooler through a low-pressure compressor outlet to an inlet pipeline of the inter-compressor cooler, compressed air with higher temperature in the inter-compressor cooler is cooled by supercritical carbon dioxide, and the cooled air enters the high-pressure compressor through an outlet of the inter-compressor cooler to an inlet pipeline of the high-pressure compressor to be continuously compressed;
continuously compressing air in the high-pressure compressor, discharging the compressed air from the high-pressure compressor, entering the high-pressure air preheater through an outlet pipeline of the high-pressure compressor, absorbing heat of the air through the high-pressure air preheater arranged at the highest temperature of a boiler hearth, and heating;
when the temperature of the air at the outlet of the high-pressure air preheater reaches the set temperature of the inlet of the high-pressure air turbine, the air in the air inlet pipeline of the high-pressure air turbine enters the high-pressure air turbine to expand and do work, and the air turbine drives a first generator connected with a shaft of the first generator to generate power;
the air expanded and acting in the high-pressure air turbine enters a medium-pressure air reheater arranged at the highest temperature position in a boiler hearth through an exhaust pipeline of the high-pressure air turbine to absorb heat again;
the air after absorbing heat again in the medium-pressure air reheater enters the medium-pressure air turbine through the medium-pressure air turbine air inlet pipeline to do expansion work again, and the medium-pressure air turbine drives a third generator connected with a shaft of the third generator to generate power;
the air after expansion work in the medium-pressure air turbine enters the low-pressure air reheater through the medium-pressure air turbine exhaust pipeline to be reheated, and the air after the reheating enters the low-pressure air turbine through the low-pressure air turbine air inlet pipeline;
the air subjected to secondary reheating in the low-pressure air reheater enters a low-pressure air turbine through a low-pressure air turbine air inlet pipeline to expand and do work, and the low-pressure air turbine drives a fourth generator connected with a shaft of the fourth generator to generate power;
the air expanded and acted in the low-pressure air turbine enters the boiler hearth through the low-pressure air turbine exhaust pipeline and continues to participate in the combustion of the fuel fed into the boiler hearth by the feeder through the boiler fuel inlet pipeline;
the supercritical carbon dioxide regenerative cycle power generation method comprises the following steps:
supercritical carbon dioxide after heat is absorbed by the heat absorption side of the inter-compressor-stage cooler enters the heat regenerator through the heat absorption side inlet pipeline of the heat regenerator to continuously absorb heat;
the supercritical carbon dioxide after absorbing heat in the heat regenerator enters the supercritical carbon dioxide preheater arranged at the lowest temperature of the boiler hearth through an outlet pipeline at the heat absorbing side of the heat regenerator to continuously absorb heat;
when the temperature of the supercritical carbon dioxide at the outlet of the supercritical carbon dioxide preheater reaches the set temperature of the inlet of the supercritical carbon dioxide turbine, the supercritical carbon dioxide enters the supercritical carbon dioxide turbine to expand and do work, and the supercritical carbon dioxide turbine drives a second generator connected with a shaft of the second generator to generate power;
the supercritical carbon dioxide after expansion and work in the supercritical carbon dioxide turbine enters a regenerator through an exhaust pipeline of the supercritical carbon dioxide turbine to release heat;
the supercritical carbon dioxide after being discharged in the heat regenerator enters a supercritical carbon dioxide condenser through an inlet pipeline of the supercritical carbon dioxide condenser to be condensed;
the supercritical carbon dioxide condensed in the supercritical carbon dioxide condenser enters a supercritical carbon dioxide compressor through an outlet pipeline of the supercritical carbon dioxide condenser to be compressed and boosted;
and (3) enabling the compressed and boosted supercritical carbon dioxide in the supercritical carbon dioxide compressor to enter a heat absorption side of an inter-compressor cooler through an outlet pipeline of the supercritical carbon dioxide compressor to absorb heat again, and continuously completing the next supercritical carbon dioxide regenerative power generation cycle.
The invention has at least the following beneficial technical effects:
the invention provides an air-carbon dioxide combined cycle power generation system and a method, wherein an air secondary reheating cycle power generation system is overlapped on the basis of a recently rising supercritical carbon dioxide cycle power generation system, so that the cascade utilization of combustion energy of fuel in a boiler is realized, and the economy of cycle power generation of a thermal power plant is improved. In addition, no matter the air secondary reheating cycle power generation system or the supercritical carbon dioxide reheating cycle power generation system adopts the cycle working medium which is not water or water vapor, so that the selection of a high-efficiency clean power generation mode is increased for vast water-deficient areas in China.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numerals illustrate:
class of equipment:
1. the device comprises a first generator, 2, a low-pressure compressor, 3, a high-pressure compressor, 4, a high-pressure air turbine, 5, a compressor inter-stage cooler, 6, a medium-pressure air turbine, 7, a low-pressure air turbine, 8, a high-pressure air preheater, 9, a medium-pressure air reheater, 10, a low-pressure air reheater, 11, a feeder, 12, a boiler furnace, 13, a second generator, 14, a supercritical carbon dioxide turbine, 15, a regenerator, 16, a supercritical carbon dioxide compressor, 17, a supercritical carbon dioxide condenser, 18, a supercritical carbon dioxide preheater, 19, a third generator, 20 and a fourth generator.
Pipeline type:
l1, low pressure compressor inlet pipeline, L2, low pressure compressor export to compressor inter-stage cooler inlet pipeline, L3, compressor inter-stage cooler export to high pressure compressor inlet pipeline, L4, high pressure compressor export pipeline, L5, high pressure air turbine inlet pipeline, L6, high pressure air turbine exhaust pipe, L7, medium pressure air turbine inlet pipeline, L8, medium pressure air turbine exhaust pipe, L9, low pressure air turbine inlet pipeline, L10, low pressure air turbine exhaust pipe.
P1, a supercritical carbon dioxide turbine inlet pipeline, P2, a supercritical carbon dioxide turbine exhaust pipeline, P3, a supercritical carbon dioxide condenser inlet pipeline, P4, a supercritical carbon dioxide condenser outlet pipeline, P5, a supercritical carbon dioxide compressor outlet pipeline, P6, a regenerator heat absorption side inlet pipeline, P7 and a regenerator heat absorption side outlet pipeline.
Fuel type:
f1, boiler fuel inlet duct.
Transmission shafts:
s1, a high-pressure air turbine drives a shaft of a first generator, S2, a supercritical carbon dioxide turbine drives a shaft of a second generator, S3, a medium-pressure air turbine drives a shaft of a third generator, and S4, a low-pressure air turbine drives a shaft of a fourth generator.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in FIG. 1, the invention provides an air-carbon dioxide combined cycle power generation system, which comprises an air secondary reheating cycle power generation system and a supercritical carbon dioxide regenerative cycle power generation system.
The air double reheat cycle power generation system comprises: an air preheater 8 arranged at the highest temperature in the boiler furnace 12, a low-pressure compressor 2, a high-pressure compressor 3, a first generator 1, and a compressor inter-stage cooler 5 for taking heat carried by the compressed air in the low-pressure compressor 2, which are coaxially connected to the high-pressure air turbine 4. In addition, there are a high-pressure air preheater 8, a high-pressure air turbine 4, a medium-pressure air reheater 9, a medium-pressure air turbine 6, a low-pressure air reheater 10, a low-pressure air turbine 7, and pipes connected to each other, which are connected to the high-pressure compressor 3 in this order in terms of air flow direction.
The supercritical carbon dioxide regenerative cycle power generation system comprises: a supercritical carbon dioxide preheater 18 arranged at the lowest temperature of the boiler furnace 12, a supercritical carbon dioxide turbine 14, a regenerator 15, a supercritical carbon dioxide condenser 17, a supercritical carbon dioxide compressor 16, an inter-compressor stage cooler 5 and pipes interconnecting the respective devices, which are arranged in this order in the supercritical carbon dioxide flow direction at the outlet of the supercritical carbon dioxide preheater 18. Wherein the heat absorption side of the inter-compressor stage cooler 5 is the flow of supercritical carbon dioxide, and the heat release side is the flow of air at the outlet of the low-pressure compressor 2. Finally, a second generator 13 is coaxially connected to the supercritical carbon dioxide turbine 14.
The invention provides an air-carbon dioxide combined cycle power generation method, which comprises an air double reheat cycle power generation method and a supercritical carbon dioxide regenerative cycle power generation method.
The air double reheat cycle power generation method is established on the air double reheat cycle power generation system. The air double reheat cycle power generation method comprises the following steps:
step 1: air enters the low-pressure compressor 2 through the low-pressure compressor inlet pipeline L1 for compression. Turning to step 2;
step 2: the air compressed in the low-pressure compressor 2 enters the inter-compressor stage cooler 5 through the low-pressure compressor outlet to the inter-compressor stage cooler inlet line L2. The compressed air with higher temperature in the inter-compressor stage cooler 5 is cooled by supercritical carbon dioxide, and the cooled air enters the high-pressure compressor 3 through the outlet of the inter-compressor stage cooler to the inlet pipeline L3 of the high-pressure compressor to be continuously compressed. Turning to step 3;
step 3: the air which continues to be compressed in the high-pressure compressor 3 is discharged from the high-pressure compressor 3 and enters the high-pressure air preheater 8 through the high-pressure compressor outlet line L4. The air absorbs heat through the high-pressure air preheater 8 disposed at the highest temperature of the boiler furnace 12 and then heats up. Turning to step 4;
step 4: when the temperature of the air at the outlet of the high-pressure air preheater 8 reaches the set temperature of the inlet of the high-pressure air turbine 4, the air in the air inlet pipeline L5 of the high-pressure air turbine enters the high-pressure air turbine 4 to expand and do work, and the air turbine drives the first generator 1 connected with the shaft S1 of the first generator to generate power. Turning to step 5;
step 5: the air expanded and acting in the high-pressure air turbine 4 enters the medium-pressure air reheater 9 arranged at the highest temperature in the boiler furnace 12 through the high-pressure air turbine exhaust pipeline L6 to absorb heat again. Turning to step 6;
step 6: the air after absorbing heat again in the medium-pressure air reheater 9 enters the medium-pressure air turbine 6 through the medium-pressure air turbine air inlet pipeline L7 to do expansion work again, and the medium-pressure air turbine drives the third generator 19 connected with the shaft S3 of the third generator to generate electricity. Turning to step 7;
step 7: the air expanded and acting in the medium-pressure air turbine 6 enters the low-pressure air reheater 10 through the medium-pressure air turbine exhaust pipeline L8 for secondary reheating. The air after the secondary reheating enters the low-pressure air turbine 7 through the low-pressure air turbine air inlet pipeline L9. Turning to step 8;
step 8: the air subjected to secondary reheating in the low-pressure air reheater 10 enters the low-pressure air turbine 7 through the low-pressure air turbine air inlet pipeline L9 to expand and do work, and drives the fourth generator 20 connected with the shaft S4 of the fourth generator through the low-pressure air turbine to generate electricity. Turning to step 9;
step 9: the air expanded and acting in the low-pressure air turbine 7 enters the boiler furnace 12 through the low-pressure air turbine exhaust pipeline L10 and continues to participate in the combustion of the fuel fed into the boiler furnace 12 by the feeder 11 through the boiler fuel inlet pipeline F1.
The supercritical carbon dioxide regenerative cycle power generation method is established on the supercritical carbon dioxide regenerative cycle power generation system. The supercritical carbon dioxide regenerative cycle power generation method comprises the following steps:
step 10: supercritical carbon dioxide after heat absorption at the heat absorption side of the inter-compressor stage cooler 5 enters the heat regenerator 15 through the heat regenerator heat absorption side inlet pipeline P6 to continue absorbing heat. Turning to step 11;
step 11: the supercritical carbon dioxide absorbed in the regenerator 15 enters the supercritical carbon dioxide preheater 18 arranged at the lowest temperature of the boiler furnace 12 through the regenerator heat absorbing side outlet pipe P7 to continue absorbing heat. Turning to step 12;
step 12: when the temperature of the supercritical carbon dioxide at the outlet of the supercritical carbon dioxide preheater 18 reaches the set temperature at the inlet of the supercritical carbon dioxide turbine 14, the supercritical carbon dioxide enters the supercritical carbon dioxide turbine 14 to expand and do work. And the supercritical carbon dioxide turbine drives the second generator 13 connected with the shaft S2 of the second generator to generate electricity. Turning to step 13;
step 13: the supercritical carbon dioxide expanded and worked in the supercritical carbon dioxide turbine 14 enters the regenerator 15 through the exhaust pipeline P2 of the supercritical carbon dioxide turbine to release heat. Go to step 14;
step 14: the supercritical carbon dioxide after heat release in the heat regenerator 15 enters the supercritical carbon dioxide condenser 17 through the supercritical carbon dioxide condenser inlet pipeline P3 to be condensed. Turning to step 15;
step 15: the supercritical carbon dioxide condensed in the supercritical carbon dioxide condenser 17 enters the supercritical carbon dioxide compressor 16 through the supercritical carbon dioxide condenser outlet pipeline P4 to be compressed and boosted. Go to step 16;
step 16: the supercritical carbon dioxide compressed and boosted in the supercritical carbon dioxide compressor 16 enters the heat absorption side of the inter-compressor stage cooler 5 through the outlet pipeline P5 of the supercritical carbon dioxide compressor to absorb heat again, and the next supercritical carbon dioxide regenerative power generation cycle is completed continuously.
While the invention has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (8)
1. The air-carbon dioxide combined cycle power generation system is characterized by comprising an air double reheat cycle power generation system and a supercritical carbon dioxide regenerative cycle power generation system;
the air double reheat cycle power generation system comprises: the high-pressure air preheater (8) is arranged at the highest temperature in the boiler furnace (12), the low-pressure air compressor (2), the high-pressure air compressor (3) and the first generator (1) are coaxially connected with the high-pressure air turbine (4), the inter-compressor-stage cooler (5) is used for taking heat carried by compressed air in the low-pressure air compressor (2), and the high-pressure air preheater (8), the high-pressure air turbine (4), the medium-pressure air reheater (9), the medium-pressure air turbine (6), the low-pressure air reheater (10), the low-pressure air turbine (7) and pipelines which are connected with all devices are sequentially arranged according to the air flow direction and are connected with the high-pressure air compressor (3); the high-pressure air preheater (8), the medium-pressure air reheater (9) and the low-pressure air reheater (10) are arranged in the boiler furnace (12); the outlet of the low-pressure air turbine (7) is positioned in a boiler furnace (12);
the supercritical carbon dioxide regenerative cycle power generation system comprises: a supercritical carbon dioxide preheater (18) arranged at the lowest temperature of the boiler furnace (12), and a supercritical carbon dioxide turbine (14), a heat regenerator (15), a supercritical carbon dioxide condenser (17), a supercritical carbon dioxide compressor (16), an inter-compressor-stage cooler (5) and pipelines connected with all devices which are sequentially arranged at the outlet of the supercritical carbon dioxide preheater (18) according to the supercritical carbon dioxide flow direction, wherein the heat absorption side of the inter-compressor-stage cooler (5) is that supercritical carbon dioxide flows, and the heat release side is that the outlet air of the low-pressure compressor (2) flows; the second generator (13) is coaxially connected with the supercritical carbon dioxide turbine (14).
2. An air-carbon dioxide combined cycle power generation system according to claim 1, wherein the high-pressure air preheater (8), the medium-pressure air reheater (9) and the low-pressure air reheater (10) are tubular air preheaters or reheaters, the tubular side of which can bear the outlet air pressure of the high-pressure compressor (3), the exhaust pressure of the high-pressure air turbine (4) and the exhaust pressure of the medium-pressure air turbine (6), respectively.
3. An air-carbon dioxide combined cycle power generation system according to claim 1, wherein the supercritical carbon dioxide preheater (18) is a tubular supercritical carbon dioxide preheater with a tubular side capable of withstanding supercritical carbon dioxide pressure at an outlet of the supercritical carbon dioxide compressor (16).
4. An air-carbon dioxide combined cycle power generation system according to claim 1, characterized in that the flow direction of the cold-hot fluid in the regenerator (15) is arranged in a counter-current manner.
5. An air-carbon dioxide combined cycle power generation system according to claim 1, characterized in that the cold-hot fluid flow direction in the inter-compressor stage cooler (5) is arranged in a counter-current manner.
6. An air-carbon dioxide combined cycle power generation system according to claim 1, further comprising a feeder (11) for delivering fuel to the boiler furnace (12), wherein the fuel in the feeder (11) is selected from biomass, municipal waste, natural gas and light diesel instead of fuel based on local fuel characteristics or fuel price factors.
7. An air-carbon dioxide combined cycle power generation system according to claim 1, characterized in that the high-pressure air turbine (4), the medium-pressure air turbine (6) and the low-pressure air turbine (7) can be increased or decreased according to the actual expansion process, when the low-pressure air turbine (7) is decreased, the exhaust gas of the medium-pressure air turbine (6) can be properly diffused into the boiler furnace (12), when the medium-pressure air turbine (6) and the low-pressure air turbine (7) are decreased, the exhaust gas of the high-pressure air turbine (4) can be properly diffused into the boiler furnace (12), and when the air level is increased after the low-pressure air turbine (7), the high-pressure air turbine (4), the medium-pressure air turbine (6) and the low-pressure air turbine (7) can be sequentially arranged in the arrangement manner.
8. An air-carbon dioxide combined cycle power generation method, characterized in that the method is based on an air-carbon dioxide combined cycle power generation system as claimed in any one of claims 1 to 7, and comprises an air double reheat cycle power generation method and a supercritical carbon dioxide regenerative cycle power generation method, wherein the air double reheat cycle power generation method comprises:
air enters the low-pressure compressor (2) through the low-pressure compressor inlet pipeline (L1) for compression;
the compressed air in the low-pressure compressor (2) enters the inter-compressor stage cooler (5) through a low-pressure compressor outlet to an inter-compressor stage cooler inlet pipeline (L2), compressed air with higher temperature in the inter-compressor stage cooler (5) is cooled by supercritical carbon dioxide, and the cooled air enters the high-pressure compressor (3) through the inter-compressor stage cooler outlet to a high-pressure compressor inlet pipeline (L3) to be continuously compressed;
the air which is continuously compressed in the high-pressure compressor (3) is discharged from the high-pressure compressor (3), enters the high-pressure air preheater (8) through a high-pressure compressor outlet pipeline (L4), absorbs heat through the high-pressure air preheater (8) arranged at the highest temperature of the boiler furnace (12), and then rises in temperature;
when the temperature of air at the outlet of the high-pressure air preheater (8) reaches the set temperature of the inlet of the high-pressure air turbine (4), air in the air inlet pipeline (L5) of the high-pressure air turbine enters the high-pressure air turbine (4) to expand and do work, and the air turbine drives a first generator (1) connected with a shaft (S1) of the first generator to generate power;
the air expanded and acting in the high-pressure air turbine (4) enters a medium-pressure air reheater (9) arranged at the highest temperature position in a boiler furnace (12) through a high-pressure air turbine exhaust pipeline (L6) to absorb heat again;
the air after absorbing heat again in the medium-pressure air reheater (9) enters the medium-pressure air turbine (6) through the medium-pressure air turbine air inlet pipeline (L7) to do expansion work again, and the medium-pressure air turbine drives a third generator (19) connected with a shaft (S3) of the third generator to generate power;
air after expansion work in the medium-pressure air turbine (6) enters the low-pressure air reheater (10) through the medium-pressure air turbine exhaust pipeline (L8) to be reheated, and the air after the reheating enters the low-pressure air turbine (7) through the low-pressure air turbine air inlet pipeline (L9);
the air subjected to secondary reheating in the low-pressure air reheater (10) enters the low-pressure air turbine (7) through the low-pressure air turbine air inlet pipeline (L9) to expand and do work, and drives a fourth generator (20) connected with a shaft (S4) of the fourth generator to generate electricity through the low-pressure air turbine;
air expanded and acting in the low-pressure air turbine (7) enters the boiler furnace (12) through the low-pressure air turbine exhaust pipeline (L10) and continuously participates in the combustion of fuel sent into the boiler furnace (12) by the feeder (11) through the boiler fuel inlet pipeline (F1);
the supercritical carbon dioxide regenerative cycle power generation method comprises the following steps:
supercritical carbon dioxide after heat is absorbed by the heat absorption side of the inter-compressor-stage cooler (5) enters the heat regenerator (15) through the heat absorption side inlet pipeline (P6) of the heat regenerator to continue absorbing heat;
the supercritical carbon dioxide after absorbing heat in the heat regenerator (15) enters a supercritical carbon dioxide preheater (18) arranged at the lowest temperature of the boiler furnace (12) through an outlet pipeline (P7) at the heat absorbing side of the heat regenerator to continuously absorb heat;
when the temperature of supercritical carbon dioxide at the outlet of the supercritical carbon dioxide preheater (18) reaches the set temperature of the inlet of the supercritical carbon dioxide turbine (14), the supercritical carbon dioxide enters the supercritical carbon dioxide turbine (14) to expand and do work, and the supercritical carbon dioxide turbine drives a second generator (13) connected with a shaft (S2) of the second generator to generate power;
the supercritical carbon dioxide after expansion work in the supercritical carbon dioxide turbine (14) enters a regenerator (15) through a supercritical carbon dioxide turbine exhaust pipeline (P2) to release heat;
the supercritical carbon dioxide after heat release in the heat regenerator (15) enters a supercritical carbon dioxide condenser (17) through a supercritical carbon dioxide condenser inlet pipeline (P3) to be condensed;
the supercritical carbon dioxide condensed in the supercritical carbon dioxide condenser (17) enters the supercritical carbon dioxide compressor (16) through the outlet pipeline (P4) of the supercritical carbon dioxide condenser to be compressed and boosted;
the supercritical carbon dioxide compressed and boosted in the supercritical carbon dioxide compressor (16) enters the heat absorption side of the inter-compressor-stage cooler (5) through the outlet pipeline (P5) of the supercritical carbon dioxide compressor to absorb heat again, and the next supercritical carbon dioxide regenerative power generation cycle is completed continuously.
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