Compressed carbon dioxide heat pump and heat conduction oil tank type photo-thermal coupled power generation system

Abstract

The utility model relates to the technical field of solar photo-thermal power generation, in particular to a compressed carbon dioxide heat pump and heat conduction oil groove type photo-thermal coupled power generation system. The compressed carbon dioxide heat pump and heat conduction oil groove type photo-thermal coupled power generation system comprises a solar groove type heat collection module, a carbon dioxide heat conduction oil heat exchanger, a compressed carbon dioxide heat pump module, a fused salt heat storage module, a power generation module and a low-temperature heat storage module. The solar trough type heat collection module exchanges heat with the compressor compressed carbon dioxide heat pump module through the carbon dioxide heat conduction oil heat exchanger. The compressed carbon dioxide heat pump module exchanges heat with the low-temperature heat storage module through the fused salt heat storage module and the power generation module. The temperature of the fused salt in the trough type solar photo-thermal power station can be increased to 560 DEG C or above, the use amount of the fused salt is greatly reduced, the investment cost is reduced, and meanwhile steam parameters are improved, so that the power generation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar thermal power generation, in particular to a power generation system of a compressed carbon dioxide heat pump and a heat transfer oil tank type photothermal coupling. Background Art

[0002] Solar thermal power generation (CSP) is a system that converts solar energy into thermal energy and generates electricity through the process of heat-to-work conversion. Solar thermal power generation uses solar heat collection at the front end and synchronous generators at the back end, and is equipped with a large-capacity, long-cycle, and highly safe heat storage system; its basic operation process is: the concentrator tracks the sun to focus and reflect direct radiation onto the absorber, heating the heat transfer fluid in the absorber and converting solar energy into thermal energy; thermal energy can directly exchange heat with water to generate high-temperature and high-pressure steam to drive the steam turbine generator set to generate electricity, or it can be stored in a storage tank and released to generate electricity when it is needed.

[0003] According to the different forms of concentration, the solar thermal power generation commercially applied internationally mainly includes tower type, trough type and linear Fresnel type. The most widely used are tower molten salt solar thermal power generation system and trough type solar thermal power generation system; among them, the tower molten salt solar thermal power generation system can increase the molten salt temperature from 290℃ to about 560℃, and its efficiency is high. Under the same installed capacity and heat storage time, the amount of molten salt is only 1 / 3 of the trough type solar thermal system; but the tower molten salt solar thermal power generation system has high requirements for site selection; the trough type solar thermal system has relatively low requirements for site selection. The traditional trough type solar thermal power generation system can be divided into a collector island, a heat storage and exchange island and a power generation island; the main components and equipment include: trough collector, oil-salt heat exchanger, hot salt tank, cold salt tank, steam generator and steam turbine generator set. Several trough collectors are connected in series to form a standard collector loop, and a large number of standard collector loops are connected in parallel to form a collector field. The basic operation process of a trough solar thermal power station is as follows: the trough collector collects heat by tracking the sun, heats the heat transfer oil circulating in the collector, and the heat transfer oil enters the oil-salt heat exchanger to release heat to heat the molten salt, and the high-temperature molten salt is stored in the hot salt tank; when generating electricity, the heat of the high-temperature molten salt in the hot salt tank is released and enters the steam generator to heat water to generate steam, thereby achieving continuous and uninterrupted power generation. However, due to the limitations of high-temperature cracking of the heat transfer oil and the limitations of the trough collector, the trough concentrating solar collector system can only heat the heat transfer oil to 400°C, and then transfer the heat of the heat transfer oil to the molten salt, and the temperature of the high-temperature molten salt can only reach 390°C; therefore, the temperature difference of the trough solar thermal energy is only 100°C (290°C ~ 390°C); while the temperature difference of the molten salt used in the tower solar thermal can reach 270°C (290°C ~ 560°C), which not only greatly increases the energy storage cost of the trough solar thermal power station, but also leads to lower steam inlet parameters of the steam turbine and low thermoelectric conversion efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a power generation system that couples a compressed carbon dioxide heat pump with a thermal oil tank-type solar thermal energy storage system. The power generation system can solve the problems existing in the prior art, not only can the temperature of the tank-type solar thermal energy storage molten salt be increased, the amount of molten salt used be reduced, and the investment cost of the tank-type solar thermal energy storage system be greatly reduced, but also the waste heat of the exhaust steam of the power generation system can be recovered to improve the system efficiency.

[0005] The utility model provides a power generation system of a compressed carbon dioxide heat pump and a thermal oil trough photothermal coupling, which comprises a solar trough heat collection module, a carbon dioxide thermal oil heat exchanger, a compressed carbon dioxide heat pump module, a molten salt heat storage module, a power generation module and a low-temperature heat storage module;

[0006] The solar trough heat collection module exchanges heat with the compressor compressed carbon dioxide heat pump module through the carbon dioxide thermal oil heat exchanger;

[0007] The compressed carbon dioxide heat pump module exchanges heat with the low-temperature heat storage module through the molten salt heat storage module, the power generation module and the low-temperature heat storage module.

[0008] Preferably, the solar trough collector module includes a low-pressure trough collector and a high-pressure trough collector;

[0009] The carbon dioxide heat transfer oil heat exchanger includes a low-pressure carbon dioxide heat transfer oil heat exchanger and a high-pressure carbon dioxide heat transfer oil heat exchanger;

[0010] The low-pressure trough heat collector is connected to the low-pressure carbon dioxide heat-conducting oil heat exchanger, and the high-pressure trough heat collector is connected to the high-pressure carbon dioxide heat-conducting oil heat exchanger.

[0011] Preferably, the heat transfer medium of the low-pressure trough collector and the high-pressure trough collector includes heat transfer oil, water or molten salt.

[0012] Preferably, the low-pressure carbon dioxide thermal oil heat exchanger and the high-pressure carbon dioxide thermal oil heat exchanger are carbon dioxide water heat exchangers or carbon dioxide molten salt heat exchangers.

[0013] Preferably, the compressed carbon dioxide heat pump module comprises a low-pressure carbon dioxide compressor, a high-pressure carbon dioxide compressor, an electric motor, a carbon dioxide expander, a low-pressure carbon dioxide molten salt heater, a high-pressure carbon dioxide molten salt heater, a regenerator and a carbon dioxide hot water absorber;

[0014] The low-pressure carbon dioxide compressor, the high-pressure carbon dioxide compressor, the electric motor, and the carbon dioxide expander are connected to a shaft system through a coupling;

[0015] The molten salt heat storage module includes a cold salt tank, a hot salt tank, a cold salt pump and a hot salt pump;

[0016] The power generation and low-temperature heat storage module includes an evaporator, a steam turbine, a generator, a carbon dioxide hot water absorber, a hot water tank, a cold water tank, a hot water pump, a cold water pump and a low-pressure steam-water heater.

[0017] Preferably, the inlet of the low-pressure trough heat collector is connected to the outlet of the heat transfer oil side of the low-pressure carbon dioxide heat transfer oil heat exchanger, and the outlet of the low-pressure trough heat collector is connected to the inlet of the heat transfer oil side of the low-pressure carbon dioxide heat transfer oil heat exchanger;

[0018] The carbon dioxide side inlet of the low-pressure carbon dioxide heat-conducting oil heat exchanger is connected to the low-pressure side carbon dioxide outlet of the regenerator.

[0019] Preferably, the inlet of the low-pressure carbon dioxide compressor is connected to the carbon dioxide side outlet of the low-pressure carbon dioxide thermal oil heat exchanger;

[0020] The outlet of the low-pressure carbon dioxide compressor is connected to the carbon dioxide side inlet of the low-pressure carbon dioxide molten salt heater, and the molten salt side inlet of the low-pressure carbon dioxide molten salt heater is connected to the outlet of the cold salt pump.

[0021] Preferably, the low-pressure carbon dioxide molten salt heater is connected to the carbon dioxide side inlet of the high-pressure carbon dioxide thermal oil heat exchanger, and the thermal oil side outlet of the high-pressure carbon dioxide thermal oil heat exchanger is connected to the inlet of the high-pressure trough collector.

[0022] Preferably, the outlet of the high-pressure trough heat collector is connected to the inlet of the heat transfer oil side of the high-pressure carbon dioxide heat transfer oil heat exchanger, and the outlet of the carbon dioxide side of the high-pressure carbon dioxide heat transfer oil heat exchanger is connected to the inlet of the high-pressure carbon dioxide compressor;

[0023] The outlet of the high-pressure carbon dioxide compressor is connected to the carbon dioxide side inlet of the high-pressure carbon dioxide molten salt heater.

[0024] Preferably, the carbon dioxide side outlet of the high-pressure carbon dioxide molten salt heater is connected to the high-pressure side inlet of the regenerator, and the regenerator outlet is connected to the carbon dioxide expander inlet;

[0025] The expander outlet is connected to the carbon dioxide side inlet of the carbon dioxide hot water absorber.

[0026] Beneficial effects:

[0027] The utility model can increase the temperature of molten salt in the trough solar thermal power station to above 560°C, greatly reduce the amount of molten salt used, reduce investment costs, and at the same time improve steam parameters to improve power generation efficiency;

[0028] The utility model uses a compressed carbon dioxide heat pump to absorb waste heat in the power generation process to increase the temperature of the molten salt, reduce the cold end loss of the entire power plant, and thus improve the power generation efficiency of the solar thermal power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A connection diagram of a compressed carbon dioxide heat pump and a thermal oil tank type photothermal coupled power generation system provided in a specific embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 1: low-pressure trough collector, 2: high-pressure trough collector, 3: regenerator, 4: carbon dioxide expander, 5: electric motor, 6: low-pressure compressor, 7: high-pressure compressor, 8: low-pressure carbon dioxide molten salt heater, 9: high-pressure carbon dioxide molten salt heater, 10: cold salt pump, 11: cold salt tank, 12: hot salt tank, 13: hot salt pump, 14: evaporator, 15: steam turbine, 16: generator, 17: carbon dioxide hot water absorber, 8: hot water tank, 19: cold water tank, 20: hot water pump, 21: cold water pump, 22: low-pressure steam-water heater, 23: low-pressure carbon dioxide thermal oil heat exchanger, 24: high-pressure carbon dioxide thermal oil heat exchanger. DETAILED DESCRIPTION

[0033] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] like Figure 1 As shown, this embodiment provides a power generation system of a compressed carbon dioxide heat pump and a thermal oil trough-type solar thermal coupling, comprising a solar trough-type thermal collection module, a compressed carbon dioxide heat pump module, a molten salt heat storage module, a power generation module and a low-temperature heat storage module.

[0037] Wherein: the solar trough collector module includes a low-pressure trough collector 1 and a high-pressure trough collector 2, which are used to absorb solar thermal energy, and then transfer the heat absorbed by the low-pressure trough collector 1 and the high-pressure trough collector 2 to carbon dioxide through a low-pressure carbon dioxide thermal oil heat exchanger 23 and a high-pressure carbon dioxide thermal oil heat exchanger 24 to increase the inlet temperature entering the low-pressure compressor and the high-pressure compressor.

[0038] The heat transfer medium of the low-pressure trough collector 1 and the high-pressure trough collector 2 can be traditional heat transfer oil, or water or molten salt, and the corresponding low-pressure and high-pressure heat exchangers 23 and 24 become carbon dioxide water heat exchangers or carbon dioxide molten salt heat exchangers.

[0039] The compressed carbon dioxide heat pump module includes a low-pressure carbon dioxide compressor 6, a high-pressure carbon dioxide compressor 7, a motor 5, a carbon dioxide expander 4, a low-pressure carbon dioxide molten salt heater 8, a high-pressure carbon dioxide molten salt heater 9, a regenerator 3, and a carbon dioxide hot water absorber 17. The low-pressure carbon dioxide compressor 6, the high-pressure carbon dioxide compressor 7, the motor 5, and the carbon dioxide expander 4 are connected to a shaft system through a coupling. The module uses electric energy to extract low-grade heat energy from the hot water tank and heat from the trough collector to transfer to the molten salt.

[0040] The molten salt heat storage module includes a cold salt tank 11, a hot salt tank 12, a cold salt pump 10, and a hot salt pump 13. The cold salt tank 11 is connected to the inlet of the cold salt pump 10, the outlet of the cold salt pump 10 is connected to the molten salt side inlet of the high-pressure dioxide molten salt heater 9 and the low-pressure carbon dioxide molten salt heater 8, and the inlet of the hot salt tank 12 is connected to the molten salt side outlet of the high-pressure dioxide molten salt heater 9 and the low-pressure carbon dioxide molten salt heater 8; it is used to transfer the heat in the carbon dioxide to the molten salt and store it.

[0041] The power generation and low-temperature heat storage module includes an evaporator 14, a steam turbine 15, a generator 16, a carbon dioxide hot water heat absorber 17, a hot water tank 8, a cold water tank 9, a hot water pump 20, a cold water pump 21 and a low-pressure steam-water heater 22. Its function is to release the heat stored in the molten salt to drive the steam turbine to convert into electrical energy, and at the same time, the waste heat in the steam exhaust of the steam turbine is traditionally heated and stored in the hot water tank for use by the compressed carbon dioxide heat pump module;

[0042] The above four modules constitute a complete compressed carbon dioxide heat pump and thermal oil trough solar thermal coupling power generation system, and none of them can be missing; the solar trough collector module can convert solar energy into thermal energy and transfer it to carbon dioxide through the carbon dioxide thermal oil heat exchanger; the compressed carbon dioxide heat pump system can transfer the waste heat of the steam turbine generator set and the heat transferred to carbon dioxide by the solar trough collector module to the molten salt, and increase the temperature of the molten salt to above 560°C; the molten salt heat storage module can store heat in the molten salt; the power generation and low-temperature heat storage module can release the heat stored in the molten salt to drive the steam turbine to convert it into electrical energy, and store the waste heat of the steam turbine exhaust steam for reuse.

[0043] In order to describe the utility model in detail, a typical 100MW compressed carbon dioxide heat pump and thermal oil tank solar thermal coupling power generation system is described below.

[0044] The inlet of the low-pressure trough collector 1 is connected to the outlet of the heat transfer oil side of the low-pressure carbon dioxide heat transfer oil heat exchanger 23, and the outlet of the low-pressure trough collector 1 is connected to the inlet of the heat transfer oil side of the low-pressure carbon dioxide heat transfer oil heat exchanger 23. The inlet of the carbon dioxide side of the low-pressure carbon dioxide heat transfer oil heat exchanger 23 is connected to the outlet of the low-pressure carbon dioxide on the low-pressure side of the heat regenerator, and the solar heat in the low-pressure trough collector 1 is absorbed through the heat exchange of carbon dioxide and heat transfer oil to heat the 2Mpa, 290°C low-pressure carbon dioxide to 400°C; the inlet of the low-pressure carbon dioxide compressor 6 is connected to the outlet of the carbon dioxide side of the low-pressure carbon dioxide heat transfer oil heat exchanger 23, and the carbon dioxide of about 2Mpa and 400°C is compressed to 6Mpa through the low-pressure carbon dioxide compressor 6, and the temperature is increased by about 565°C; the outlet of the low-pressure carbon dioxide compressor 6 is connected to the inlet of the carbon dioxide side of the low-pressure carbon dioxide molten salt heater 8, and the inlet of the molten salt side of the low-pressure carbon dioxide molten salt heater 8 is connected to the outlet of the cold salt pump 10, and the cold salt pump 10 extracts the cold salt from the cold salt tank 11. The low-temperature molten salt of 290°C is transported to the low-pressure carbon dioxide molten salt heater 8, in which the heat of the 6Mpa, 565°C high-temperature carbon dioxide at the outlet of the low-pressure carbon dioxide compressor 6 is transferred to the molten salt, and the molten salt temperature is heated to 560°C and stored in the hot salt tank 12; the outlet temperature of the carbon dioxide side of the low-pressure carbon dioxide molten salt heater 8 is reduced to about 300°C, and the pressure is still 6Mpa; its outlet is connected to the carbon dioxide side inlet of the high-pressure carbon dioxide thermal oil heat exchanger 24, and the thermal oil side outlet of the high-pressure carbon dioxide thermal oil heat exchanger 24 is connected to the inlet of the high-pressure trough collector 2; through the heat exchange between carbon dioxide and thermal oil, the carbon dioxide working fluid absorbs solar heat in the high-pressure carbon dioxide thermal oil heat exchanger 24 and the temperature rises to 400°C. The outlet of the high-pressure trough collector 2 is connected to the inlet of the heat transfer oil side of the high-pressure carbon dioxide heat transfer oil heat exchanger 24, and the outlet of the carbon dioxide side of the high-pressure carbon dioxide heat transfer oil heat exchanger 24 is connected to the inlet of the high-pressure carbon dioxide compressor 7. The pressure of the carbon dioxide working medium is further increased to 18Mpa in the high-pressure carbon dioxide compressor 7, and the temperature is again increased to above 565°C. The outlet of the high-pressure carbon dioxide compressor 7 is connected to the inlet of the carbon dioxide side of the high-pressure carbon dioxide molten salt heater 9. The cold salt pump 10 extracts 290°C low-temperature molten salt from the cold salt tank 11 and transports it to the high-pressure carbon dioxide molten salt heater 9. In the high-pressure carbon dioxide molten salt heater 9, the heat of the 18Mpa, 565°C high-temperature carbon dioxide at the outlet of the high-pressure carbon dioxide compressor 7 is transferred to the molten salt, and the molten salt temperature is heated to 560°C and stored in the hot salt tank 12.

[0045] The outlet temperature of the carbon dioxide side of the high-pressure carbon dioxide molten salt heater 9 is reduced to about 300°C, and the pressure is maintained at 18Mpa unchanged; the outlet of the carbon dioxide side of the high-pressure carbon dioxide molten salt heater 9 is connected to the high-pressure side inlet of the heat regenerator 3, and the outlet is connected to the inlet of the carbon dioxide expander 4, and its heat is transferred to the low-temperature low-pressure carbon dioxide of 2Mpa, 65°C in the carbon dioxide hot water absorber 17, and the low-temperature low-pressure carbon dioxide is heated to 2Mpa, 290°C. The pressure of the high-pressure carbon dioxide is maintained at 18Mpa, and the temperature is further reduced to about 100°C, and then enters the carbon dioxide expander 4 to expand to 2Mpa. The recovered pressure can reduce the power consumption of the motor. Since the pressure ratio is increased by two compressions, the outlet temperature of the carbon dioxide expander 4 can be reduced to about 0°C, so it is easy to absorb heat from the low-temperature hot water.

[0046] The outlet of the expander 4 is connected to the inlet of the carbon dioxide side of the carbon dioxide hot water absorber 17, and the heat is absorbed from the hot water and the temperature rises to about 65°C. The heat in the hot water comes from the exhaust steam of the turbine 15, and then enters the low-pressure side inlet of the regenerator 3 at 2Mpa and 65°C, absorbs heat in the regenerator 3 and the temperature rises to 290°C, and enters the carbon dioxide side inlet of the low-pressure carbon dioxide thermal oil heat exchanger 23 again. This process forms a closed cycle of compressed carbon dioxide heat pump coupled with thermal oil trough solar collector, which "transports" the waste heat of the turbine exhaust during power generation and the heat in the trough collector to the high-temperature molten salt, and the temperature of the molten salt is raised to above 560°C; the hot water in the hot water tank 18 releases heat and is transported to the cold water tank 19 through the hot water pump 20.

[0047] When generating electricity, the hot salt pump 13 extracts 560℃ high-temperature hot salt from the hot salt tank 12 and transports it to the evaporator 14, heating the water to generate steam to drive the steam turbine 15 to output electricity. The exhaust steam from the steam turbine 15 heats the cold water in the cold water tank 19 through the low-pressure steam-water heater 22 and is transported and stored in the hot water tank 18 through the cold water pump 21; this forms a power generation and low-temperature heat storage module.

[0048] Table 1 lists the key parameters of the conventional 100MW thermal oil trough solar thermal power station and the utility model 100MW compressed carbon dioxide heat pump and thermal oil trough solar thermal coupling power station. It can be seen that through the implementation of the utility model, the molten salt temperature difference can be increased from 100°C to 270°, the effective utilization rate of molten salt is increased by 2.7 times, the molten salt usage is reduced by 70% compared with the conventional trough solar thermal power station, the investment in the trough solar thermal power station can be greatly reduced, and the power generation system efficiency is increased from 38% to 45.8%, and the power generation efficiency is greatly improved. Therefore, the utility model can achieve the purpose of reducing costs and increasing efficiency of trough solar thermal power stations, and effectively solve the problems of large molten salt usage, high energy storage costs and low power generation efficiency in the current trough solar thermal power stations.

[0049] Table 1 Comparison between conventional 100MW trough solar thermal power station and the utility model

[0050]

[0051]

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A power generation system of compressed carbon dioxide heat pump and thermal oil tank type photothermal coupling, characterized in that: It includes solar trough heat collection module, carbon dioxide thermal oil heat exchanger, compressed carbon dioxide heat pump module, molten salt heat storage module, power generation module and low-temperature heat storage module; The solar trough heat collection module exchanges heat with the compressor compressed carbon dioxide heat pump module through the carbon dioxide thermal oil heat exchanger; The compressed carbon dioxide heat pump module exchanges heat with the low-temperature heat storage module through the molten salt heat storage module, the power generation module and the low-temperature heat storage module.

2. The compressed carbon dioxide heat pump and thermal oil tank type light-thermal coupled power generation system according to claim 1 is characterized in that: The solar trough heat collection module includes a low-pressure trough heat collector and a high-pressure trough heat collector; The carbon dioxide heat transfer oil heat exchanger includes a low-pressure carbon dioxide heat transfer oil heat exchanger and a high-pressure carbon dioxide heat transfer oil heat exchanger; The low-pressure trough heat collector is connected to the low-pressure carbon dioxide heat-conducting oil heat exchanger, and the high-pressure trough heat collector is connected to the high-pressure carbon dioxide heat-conducting oil heat exchanger.

3. The compressed carbon dioxide heat pump and thermal oil tank type light-thermal coupled power generation system according to claim 2 is characterized in that: The heat transfer medium of the low-pressure trough heat collector and the high-pressure trough heat collector includes heat transfer oil, water or molten salt.

4. The compressed carbon dioxide heat pump and thermal oil tank type light-thermal coupled power generation system according to claim 2 is characterized in that: The low-pressure carbon dioxide thermal oil heat exchanger and the high-pressure carbon dioxide thermal oil heat exchanger are carbon dioxide water heat exchangers or carbon dioxide molten salt heat exchangers.

5. The compressed carbon dioxide heat pump and thermal oil tank type light-thermal coupled power generation system according to claim 2 is characterized in that: The compressed carbon dioxide heat pump module comprises a low-pressure carbon dioxide compressor, a high-pressure carbon dioxide compressor, an electric motor, a carbon dioxide expander, a low-pressure carbon dioxide molten salt heater, a high-pressure carbon dioxide molten salt heater, a regenerator and a carbon dioxide hot water absorber; The low-pressure carbon dioxide compressor, the high-pressure carbon dioxide compressor, the electric motor, and the carbon dioxide expander are connected to a shaft system through a coupling; The molten salt heat storage module includes a cold salt tank, a hot salt tank, a cold salt pump and a hot salt pump; The power generation and low-temperature heat storage module includes an evaporator, a steam turbine, a generator, a carbon dioxide hot water absorber, a hot water tank, a cold water tank, a hot water pump, a cold water pump and a low-pressure steam-water heater.

6. The compressed carbon dioxide heat pump and thermal oil tank type light-thermal coupled power generation system according to claim 5 is characterized in that: The inlet of the low-pressure trough heat collector is connected to the outlet of the low-pressure carbon dioxide heat-conducting oil heat exchanger on the heat-conducting oil side, and the outlet of the low-pressure trough heat collector is connected to the inlet of the low-pressure carbon dioxide heat-conducting oil heat exchanger on the heat-conducting oil side; The carbon dioxide side inlet of the low-pressure carbon dioxide heat-conducting oil heat exchanger is connected to the low-pressure side carbon dioxide outlet of the regenerator.

7. The compressed carbon dioxide heat pump and thermal oil tank type light-thermal coupled power generation system according to claim 6 is characterized in that: The inlet of the low-pressure carbon dioxide compressor is connected to the carbon dioxide side outlet of the low-pressure carbon dioxide thermal oil heat exchanger; The outlet of the low-pressure carbon dioxide compressor is connected to the carbon dioxide side inlet of the low-pressure carbon dioxide molten salt heater, and the molten salt side inlet of the low-pressure carbon dioxide molten salt heater is connected to the outlet of the cold salt pump.

8. The compressed carbon dioxide heat pump and thermal oil tank type light-thermal coupled power generation system according to claim 7 is characterized in that: The low-pressure carbon dioxide molten salt heater is connected to the carbon dioxide side inlet of the high-pressure carbon dioxide heat-conducting oil heat exchanger, and the heat-conducting oil side outlet of the high-pressure carbon dioxide heat-conducting oil heat exchanger is connected to the inlet of the high-pressure trough collector.

9. The compressed carbon dioxide heat pump and thermal oil tank type light-thermal coupled power generation system according to claim 8 is characterized in that: The outlet of the high-pressure trough heat collector is connected to the inlet of the heat transfer oil side of the high-pressure carbon dioxide heat transfer oil heat exchanger, and the outlet of the carbon dioxide side of the high-pressure carbon dioxide heat transfer oil heat exchanger is connected to the inlet of the high-pressure carbon dioxide compressor; The outlet of the high-pressure carbon dioxide compressor is connected to the carbon dioxide side inlet of the high-pressure carbon dioxide molten salt heater.

10. The compressed carbon dioxide heat pump and thermal oil tank type light-thermal coupling power generation system according to claim 9, characterized in that: The carbon dioxide side outlet of the high-pressure carbon dioxide molten salt heater is connected to the high-pressure side inlet of the regenerator, and the regenerator outlet is connected to the carbon dioxide expander inlet; The expander outlet is connected to the carbon dioxide side inlet of the carbon dioxide hot water absorber.

Images