CN108869213B - Photon-enhanced thermionic emission and carbon dioxide circulation combined power generation device and method - Google Patents
Photon-enhanced thermionic emission and carbon dioxide circulation combined power generation device and method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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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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- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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Abstract
The invention provides a photon enhanced thermionic emission and carbon dioxide circulation combined power generation device, which comprises a solar light condenser and a receiver, wherein the receiver is connected with a photon enhanced thermionic emission module group, the photon enhanced thermionic emission module group is connected with a cooling loop, and is connected with supercritical carbon dioxide circulation through an intermediate heat exchanger, and the supercritical carbon dioxide circulation comprises: the device comprises a compressor, a low-temperature heat regenerator, a high-temperature heat regenerator, a turbine, a generator and a precooler. The invention also provides a photon enhanced thermionic emission and carbon dioxide circulation combined power generation method, wherein solar energy firstly passes through the photon enhanced thermionic emission module to convert part of energy into electric energy, and the rest of energy is transmitted to supercritical carbon dioxide circulation in the form of anode waste heat to form a combined circulation system. The invention reduces the heat loss released to the environment, and has the advantages of high overall power generation efficiency, compact structure and wide application range of the combined cycle system.
Description
Technical Field
The invention relates to a photon enhanced thermionic emission and supercritical carbon dioxide circulation combined power generation device, and belongs to the technical field of solar power generation.
Background
Solar energy is inexhaustible green energy, and solar thermal power generation is one of the main modes of solar energy utilization. In recent years, the technology is developed rapidly, and mature technologies comprise solar concentrating and heat collecting power generation technologies such as groove type, tower type, fresnel type and disc type. Solar heat transfers heat to the power cycle system through an intermediate medium and heat exchanger, for example: the steam turbine generator set and the Stirling engine convert heat energy into electric energy.
Because the running temperature level of the current power circulation system is not high, the energy conversion efficiency is relatively low, and the competitive advantage of solar thermal power generation relative to photovoltaic power generation is not obvious. On one hand, a power circulation system with higher efficiency needs to be developed, the main current research and development direction is supercritical carbon dioxide circulation, and meanwhile, the temperature parameter of the circulation is improved; on the other hand, new energy conversion modes are introduced, and new breakthrough points, in particular, new thermoelectric converters, such as: the thermionic emission device has the cathode running at high temperature, and the waste heat of higher temperature generated by the anode can continuously provide heat for bottom circulation.
In recent years, solar power generation technology based on photon enhancement thermal ion emission effect is being widely developed at home and abroad, and combined with anode waste heat power generation to form a solar combined power generation device, so that the efficiency of solar power generation can be greatly improved. However, how to match the solar power generation technology based on the photon enhanced thermionic emission effect with the advanced power cycle to form a combined power generation system is a problem to be solved at present.
Disclosure of Invention
The invention aims to solve the technical problem that how to match a solar power generation technology based on photon enhanced thermionic emission effect with advanced power cycle to form a combined power generation system so as to improve the overall power generation efficiency of the combined power generation system.
In order to solve the technical problems, the technical scheme of the invention is to provide a photon-enhanced thermionic emission and carbon dioxide cycle combined power generation device, which is characterized in that: the solar energy collector comprises a solar light collector and a receiver, wherein the solar light collector and the receiver are oppositely arranged, and the receiver is connected with a photon enhanced thermionic emission module group;
the photon enhanced thermionic emission module components are divided into a first photon enhanced thermionic emission module group and a second photon enhanced thermionic emission module group, and the anode temperature corresponding to the first photon enhanced thermionic emission module group is lower than the anode temperature corresponding to the second photon enhanced thermionic emission module group;
the anodes of the first photon enhanced thermionic emission module group and the second photon enhanced thermionic emission module group are respectively connected with the first cooler and the second cooler; the outlet of the first cooler is connected with the heat transfer medium side inlet of the first intermediate heat exchanger, the heat transfer medium side outlet of the first intermediate heat exchanger is connected with the inlet of the first medium pump, and the outlet of the first medium pump is connected with the inlet of the first cooler to form a first cooling loop; the outlet of the second cooler is connected with the heat transfer medium side inlet of the second intermediate heat exchanger, the heat transfer medium side outlet of the second intermediate heat exchanger is connected with the inlet of the second medium pump, and the outlet of the second medium pump is connected with the inlet of the second cooler to form a second cooling loop;
the carbon dioxide side of the first intermediate heat exchanger and the carbon dioxide side of the second intermediate heat exchanger are connected with a supercritical carbon dioxide circulating system, and the heat of the heat transfer medium in the first cooling loop and the heat transfer medium in the second cooling loop are released to the carbon dioxide working medium of the supercritical carbon dioxide circulating system.
Preferably, the supercritical carbon dioxide circulation system comprises a compressor, and the outlet of the compressor is divided into two paths: one path is connected with a low-temperature side inlet of the low-temperature heat regenerator, and the other path is connected with a carbon dioxide side inlet of the first intermediate heat exchanger; the low-temperature side outlet of the low-temperature heat regenerator is connected with the low-temperature side inlet of the high-temperature heat regenerator after being combined with the carbon dioxide side outlet of the first intermediate heat exchanger, the low-temperature side outlet of the high-temperature heat regenerator is connected with the carbon dioxide side inlet of the second intermediate heat exchanger, the carbon dioxide side outlet of the second intermediate heat exchanger is connected with the turbine inlet, the turbine outlet is connected with the high-temperature side inlet of the high-temperature heat regenerator, the high-temperature side outlet of the high-temperature heat regenerator is connected with the high-temperature side inlet of the low-temperature heat regenerator, the high-temperature side outlet of the low-temperature heat regenerator is connected with the precooler inlet, and the precooler outlet is connected with the compressor inlet; the compressor, the turbine and the generator are coaxially connected.
Preferably, the condenser is a dish condenser, a tower condenser or a fresnel lens condenser.
Preferably, the receiver is a direct-lit receiver of a cavity structure.
Preferably, the anode temperature of the first photon enhanced thermionic emission module group is 150-300 ℃; the anode temperature of the second photon enhanced thermionic emission module group is 500-700 ℃.
Preferably, the heat transfer medium of the first cooling loop is heat transfer oil; the heat transfer medium of the second cooling loop is low-melting-point metal liquid (such as alkali metal liquid) or molten salt.
Preferably, the first cooler and the second cooler are provided with an extended heat radiating surface, for example: fins (strips).
Preferably, the first intermediate heat exchanger and the second intermediate heat exchanger are partition wall heat exchangers, and heat exchange wall surfaces of carbon dioxide sides of the first intermediate heat exchanger and the second intermediate heat exchanger are provided with expansion heat exchange surfaces, for example, outer fin heat exchange tubes are adopted, and carbon dioxide is arranged outside the tubes.
Preferably, the low temperature regenerator and the high temperature regenerator are compact heat exchangers.
The invention also provides a photon-enhanced thermionic emission and carbon dioxide cycle combined power generation method, which is characterized in that: the photon-enhanced thermionic emission and carbon dioxide cycle combined power generation device comprises the following steps: sunlight is focused to a receiver through a condenser, the receiver heats cathodes of the first photon enhanced thermionic emission module group and the second photon enhanced thermionic emission module group, electrons emitted by the cathodes reach an anode through a gap between two poles and simultaneously output electric energy from the two poles, and the first cooler and the second cooler cool the anode and transfer waste heat to a heat transfer medium;
the first medium pump and the second medium pump continuously circulate and convey the heat transfer medium from the first cooler and the second cooler to the first intermediate heat exchanger and the second intermediate heat exchanger, and the heat transfer medium releases heat to the carbon dioxide working medium of the supercritical carbon dioxide circulating system;
in a supercritical carbon dioxide circulating system, a compressor compresses a carbon dioxide working medium, and the carbon dioxide working medium at an outlet of the compressor is divided into two paths: one path enters a low-temperature heat regenerator, and the other path enters a first intermediate heat exchanger; the two paths of carbon dioxide working media are fed into a high-temperature heat regenerator together, then fed into a second intermediate heat exchanger for further heating, and fed into a turbine for expansion work, so as to push a generator to generate electric energy; the turbine exhaust gas sequentially enters a high-temperature heat regenerator and a low-temperature heat regenerator, part of heat is transferred to a carbon dioxide working medium, and then is cooled by a precooler, and finally returns to the compressor.
Compared with the prior art, the photon enhanced thermionic emission and supercritical carbon dioxide cycle combined power generation device provided by the invention has the following beneficial effects:
1. the anode waste heat of the photon enhanced thermionic emission module is transferred to supercritical carbon dioxide circulation, heat loss released to the environment is reduced, and the overall power generation efficiency of the combined cycle system is high.
2. The photon enhancement thermionic emission module is an area type power generation device, has high power density and high power generation efficiency, is a high-efficiency compact solar power generation device, and can design different anode temperatures according to the characteristics of bottom circulation.
3. The supercritical carbon dioxide circulation structure is compact, high efficiency is maintained in a large power generation span (hundreds of kW level to hundreds of MW level), and the supercritical carbon dioxide circulation structure and the photon enhanced thermionic emission module can form a small and compact power generation device, and can also form a medium and large power generation device, so that different application requirements are met.
Drawings
FIG. 1 is a schematic diagram of a photon enhanced thermionic emission and carbon dioxide cycle cogeneration apparatus provided in this embodiment;
reference numerals illustrate:
the system comprises a 1-condenser, a 2-receiver, a 3-first photon enhanced thermionic emission module group, a 4-first cooler, a 5-first intermediate heat exchanger, a 6-first medium pump, a 7-second photon enhanced thermionic emission module group, an 8-second cooler, a 9-second intermediate heat exchanger, a 10-second medium pump, an 11-compressor, a 12-low temperature regenerator, a 13-high temperature regenerator, a 14-turbine, a 15-generator and a 16-precooler.
Detailed Description
The invention will be further illustrated with reference to specific examples.
Fig. 1 is a schematic diagram of a combined power generation device for photon enhanced thermionic emission and carbon dioxide cycle provided in this embodiment, where the combined power generation device for photon enhanced thermionic emission and carbon dioxide cycle includes a concentrator 1 of sunlight and a receiver 2, where the concentrator 1 is disposed opposite to the receiver 2, and the receiver 2 is connected to a photon enhanced thermionic emission module group including a plurality of modules. In this embodiment, the photon enhanced thermionic emission module groups include a first photon enhanced thermionic emission module group 3 and a second photon enhanced thermionic emission module group 7, and the corresponding anodes thereof have a low temperature and a high temperature (the low temperature and the high temperature are relative concepts herein, and in this embodiment, the anode temperature corresponding to the first photon enhanced thermionic emission module group 3 is lower than the anode temperature corresponding to the second photon enhanced thermionic emission module group 7).
The low-temperature and high-temperature anode is connected to the first cooler 4 and the second cooler 8, respectively. The outlet of the first cooler 4 is connected with the heat transfer medium side inlet of the first intermediate heat exchanger 5, the heat transfer medium side outlet of the first intermediate heat exchanger 5 is connected with the inlet of the first medium pump 6, and the outlet of the first medium pump 6 is connected with the inlet of the first cooler 4 to form a first cooling loop. The outlet of the second cooler 8 is connected with the heat transfer medium side inlet of the second intermediate heat exchanger 9, the heat transfer medium side outlet of the second intermediate heat exchanger 9 is connected with the inlet of the second medium pump 10, and the outlet of the second medium pump 10 is connected with the inlet of the second cooler 8 to form a second cooling loop.
The first intermediate heat exchanger 5 and the second intermediate heat exchanger 9 are connected with a supercritical carbon dioxide circulating system. The supercritical carbon dioxide circulation system includes: the compressor 11, the outlet of the compressor 11 is divided into two paths, one path is connected with the low-temperature side inlet of the low-temperature heat regenerator 12, and the other path is connected with the carbon dioxide side inlet of the first intermediate heat exchanger 5; the low-temperature side outlet of the low-temperature heat regenerator 12 and the carbon dioxide side outlet of the first intermediate heat exchanger 5 are combined and then connected with the low-temperature side inlet of the high-temperature heat regenerator 13, the low-temperature side outlet of the high-temperature heat regenerator 13 is connected with the carbon dioxide side inlet of the second intermediate heat exchanger 9, the carbon dioxide side outlet of the second intermediate heat exchanger 9 is connected with the inlet of the turbine 14, the outlet of the turbine 14 is connected with the high-temperature side inlet of the high-temperature heat regenerator 13, the high-temperature side outlet of the high-temperature heat regenerator 13 is connected with the high-temperature side inlet of the low-temperature heat regenerator 12, the high-temperature side outlet of the low-temperature heat regenerator 12 is connected with the inlet of the precooler 16, and the outlet of the precooler 16 is connected with the inlet of the compressor 11; the compressor 11, turbine 14, and generator 15 are coaxially connected.
The integrated alkali metal thermoelectric converter provided by the embodiment is connected with each device of the carbon dioxide circulating power generation device through a pipeline, and according to the control requirement of the system, devices such as a valve, an instrument and the like can be arranged on the pipeline. Auxiliary facilities, electrical systems, control systems, etc. may also be included in the system.
The specific implementation steps of the photon enhanced thermionic emission and supercritical carbon dioxide cycle combined power generation device provided by the embodiment are as follows:
sunlight is focused to the receiver 2 through the condenser 1, the receiver 2 heats the cathodes of the first photon enhanced thermionic emission module group 3 and the second photon enhanced thermionic emission module group 7, electrons emitted by the cathodes reach the anode through a gap between the two poles and simultaneously output electric energy from the two poles, and the first cooler 4 and the second cooler 8 cool the anode and transfer waste heat to a heat transfer medium. The heat transfer medium of the first cooler 4 is heat transfer oil, the temperature of which is about 200 c. The heat transfer medium of the second cooler 8 is sodium metal liquid, the temperature of which is about 600 ℃. The first medium pump 6 and the second medium pump 10 continuously circulate and convey the heat transfer medium from the first cooler 4 and the second cooler 8 to the first intermediate heat exchanger 5 and the second intermediate heat exchanger 9, and the heat transfer medium releases heat to working media of the supercritical carbon dioxide circulation system.
The compressor 11 compresses the carbon dioxide working medium to 25MPa, the carbon dioxide working medium at the outlet of the compressor 11 is divided into two paths, one path enters the low-temperature heat regenerator 12, the other path enters the first intermediate heat exchanger 5, the temperature of the two paths of carbon dioxide working medium reaches about 180 ℃, then enters the high-temperature heat regenerator 13, then enters the second intermediate heat exchanger 9 to be further heated to about 580 ℃, and then enters the turbine 14 to expand and do work so as to push the generator 15 to generate electric energy. The turbine 14 exhaust gas enters the high temperature heat regenerator 13 and the low temperature heat regenerator 12, part of heat is transferred to the carbon dioxide working medium, and then is cooled to the vicinity of normal temperature through the precooler 16, and finally returns to the compressor 11.
The solar power generation peak efficiency of the photon enhanced thermionic emission and supercritical carbon dioxide cycle combined power generation device can be estimated by the parameters and can reach more than 45%. The system can be further provided with a heat storage facility, and heat input can be continuously provided for supercritical carbon dioxide circulation when no sunlight exists or the sunlight is weak.
It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. A photon-enhanced thermionic emission and carbon dioxide cycle combined power generation device is characterized in that: the solar energy collector comprises a solar light collector (1) and a receiver (2), wherein the solar light collector (1) and the receiver (2) are arranged oppositely, and the receiver (2) is connected with a photon enhanced thermionic emission module group;
the photon enhanced thermionic emission module components are divided into a first photon enhanced thermionic emission module group (3) and a second photon enhanced thermionic emission module group (7), and the anode temperature corresponding to the first photon enhanced thermionic emission module group (3) is lower than the anode temperature corresponding to the second photon enhanced thermionic emission module group (7);
the anodes of the first photon enhanced thermionic emission module group (3) and the second photon enhanced thermionic emission module group (7) are respectively connected with a first cooler (4) and a second cooler (8); the outlet of the first cooler (4) is connected with the heat transfer medium side inlet of the first intermediate heat exchanger (5), the heat transfer medium side outlet of the first intermediate heat exchanger (5) is connected with the inlet of the first medium pump (6), and the outlet of the first medium pump (6) is connected with the inlet of the first cooler (4) to form a first cooling loop; the outlet of the second cooler (8) is connected with the heat transfer medium side inlet of the second intermediate heat exchanger (9), the heat transfer medium side outlet of the second intermediate heat exchanger (9) is connected with the inlet of the second medium pump (10), and the outlet of the second medium pump (10) is connected with the inlet of the second cooler (8) to form a second cooling loop;
the carbon dioxide side of the first intermediate heat exchanger (5) and the carbon dioxide side of the second intermediate heat exchanger (9) are connected with a supercritical carbon dioxide circulation system, and the heat of the heat transfer medium in the first cooling loop and the heat transfer medium in the second cooling loop are released to a carbon dioxide working medium of the supercritical carbon dioxide circulation system;
the supercritical carbon dioxide circulating system comprises a compressor (11), wherein the outlet of the compressor (11) is divided into two paths: one path is connected with a low-temperature side inlet of the low-temperature heat regenerator (12), and the other path is connected with a carbon dioxide side inlet of the first intermediate heat exchanger (5); the low-temperature side outlet of the low-temperature heat regenerator (12) and the carbon dioxide side outlet of the first intermediate heat exchanger (5) are combined and then connected with the low-temperature side inlet of the high-temperature heat regenerator (13), the low-temperature side outlet of the high-temperature heat regenerator (13) is connected with the carbon dioxide side inlet of the second intermediate heat exchanger (9), the carbon dioxide side outlet of the second intermediate heat exchanger (9) is connected with the turbine (14) inlet, the turbine (14) outlet is connected with the high-temperature side inlet of the high-temperature heat regenerator (13), the high-temperature side outlet of the high-temperature heat regenerator (13) is connected with the high-temperature side inlet of the low-temperature heat regenerator (12), the high-temperature side outlet of the low-temperature heat regenerator (12) is connected with the inlet of the precooler (16), and the outlet of the precooler (16) is connected with the inlet of the compressor (11); the compressor (11), the turbine (14) and the generator (15) are coaxially connected;
the heat transfer medium of the first cooling loop is heat transfer oil; the heat transfer medium of the second cooling loop is alkali metal liquid or molten salt.
2. A photon enhanced thermionic emission and carbon dioxide cycle combined power generation device as defined in claim 1, wherein: the condenser (1) is a disc condenser, a tower condenser or a Fresnel lens condenser.
3. A photon enhanced thermionic emission and carbon dioxide cycle combined power generation device as defined in claim 1, wherein: the receiver is a direct-lit receiver of a cavity structure.
4. A photon enhanced thermionic emission and carbon dioxide cycle combined power generation device as defined in claim 1, wherein: the anode temperature of the first photon enhanced thermionic emission module group (3) is 150-300 ℃; the anode temperature of the second photon enhanced thermionic emission module group (7) is 500-700 ℃.
5. A photon enhanced thermionic emission and carbon dioxide cycle combined power generation device as defined in claim 1, wherein: the first cooler (4) and the second cooler (8) are provided with expansion radiating surfaces.
6. A photon enhanced thermionic emission and carbon dioxide cycle combined power generation device as defined in claim 1, wherein: the first intermediate heat exchanger (5) and the second intermediate heat exchanger (9) are partition wall heat exchangers, and heat exchange wall surfaces of carbon dioxide sides of the first intermediate heat exchanger (5) and the second intermediate heat exchanger (9) are provided with expansion heat exchange surfaces.
7. A photon enhanced thermionic emission and carbon dioxide cycle combined power generation device as defined in claim 1, wherein: the low-temperature heat regenerator (12) and the high-temperature heat regenerator (13) are compact heat exchangers.
8. A photon-enhanced thermionic emission and carbon dioxide cycle combined power generation method is characterized in that: a photon-enhanced thermionic emission and carbon dioxide cycle combined power generation device as claimed in any one of claims 1-7, comprising the steps of: sunlight is focused to a receiver (2) through a condenser (1), the receiver (2) heats cathodes of a first photon enhanced thermionic emission module group (3) and a second photon enhanced thermionic emission module group (7), electrons emitted by the cathodes reach anodes through gaps between the two poles and simultaneously output electric energy from the two poles, and a first cooler (4) and a second cooler (8) cool the anodes and transfer waste heat to a heat transfer medium;
the first medium pump (6) and the second medium pump (10) continuously circulate and convey the heat transfer medium from the first cooler (4) and the second cooler (8) to the first intermediate heat exchanger (5) and the second intermediate heat exchanger (9) respectively, and the heat transfer medium releases heat to the carbon dioxide working medium of the supercritical carbon dioxide circulating system;
in the supercritical carbon dioxide circulating system, a compressor (11) compresses a carbon dioxide working medium, and the carbon dioxide working medium at an outlet of the compressor (11) is divided into two paths: one path enters a low-temperature heat regenerator (12), and the other path enters a first intermediate heat exchanger (5); two paths of carbon dioxide working media from the low-temperature heat regenerator (12) and the first intermediate heat exchanger (5) enter the high-temperature heat regenerator (13) together, enter the second intermediate heat exchanger for further heating, enter the turbine (14) for expansion and work, and push the generator (15) to generate electric energy; the turbine (14) exhaust gas sequentially enters the high-temperature heat regenerator (13) and the low-temperature heat regenerator (12), part of heat is transferred to the carbon dioxide working medium, and then is cooled by the precooler (16), and finally returns to the compressor (11).
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