A photothermal heat-supplementing heat-storage power generation system

Abstract

The application discloses a kind of photothermal heat supplement heat storage power generation systems, including low temperature energy storage system, high temperature energy storage system, fused salt energy storage device, first counterflow heat exchanger, compressor, expander, generator, photothermal heat supplement system and the connecting pipeline between them;The inlet of the compressor and the outlet of expander are communicated with the port A of low temperature energy storage system;The photothermal heat supplement system is installed between the inlet of the expander and the steam passage of first counterflow heat exchanger, and the outlet of the compressor is also communicated with the end of the steam passage of first counterflow heat exchanger;The other end of first counterflow heat exchanger steam passage is communicated with the port B of high temperature energy storage system;Two ends of the fused salt passage of the first counterflow heat exchanger are communicated with fused salt energy storage device.The application improves the power generation efficiency by adding the design of photothermal heat supplement system, and is easy to commercial implementation.

Description

Technical Field

[0001] This invention belongs to the field of energy storage and power generation technology of new energy, and specifically relates to a solar thermal supplementation and thermal storage power generation system. Background Technology

[0002] Energy storage technology is a key technology for solving the problems of large-scale integration of renewable energy and curtailment of wind and solar power; it is an essential technology for the development of distributed energy, smart grids, and the energy internet; and it is also an important supporting technology for solving peak shaving and valley filling of conventional power, improving the efficiency, security, and economy of conventional energy generation and transmission. As green energy begins to gradually replace global electricity supply, large-scale energy storage will be needed all over the world, and new technologies such as carbon dioxide energy storage, compressed air energy storage, and hydrogen energy storage are emerging one after another.

[0003] Compressed air energy storage boasts a large capacity, with single-unit capacities exceeding hundreds of megawatts, second only to pumped hydro storage. However, the compressed air used for energy storage is heated, leading to energy loss during the conversion process and low energy utilization efficiency. It has not yet been commercialized and is heavily limited by geographical conditions. To address the technical and application bottlenecks of compressed air energy storage systems, carbon dioxide energy storage is proposed. Compared to air, carbon dioxide offers unique advantages as a medium; however, its cost is high, and the main equipment is still in the research stage, requiring extensive research and development to make it more feasible. Hydrogen energy storage faces challenges due to high hydrogen costs, high power plant construction costs, low energy conversion efficiency, low technological maturity, and a long process from hydrogen production to storage, transportation, and power generation. These factors pose significant challenges to the widespread application of hydrogen energy storage power generation. Therefore, finding a new energy storage power generation technology solution is essential. Summary of the Invention

[0004] To achieve low-cost, high-efficiency energy storage, this invention provides a solar thermal supplementation thermal energy storage power generation system. Compared with existing technologies, it uses steam as the working medium and molten salt as the thermal storage medium. Through the design of high and low temperature energy storage systems, it realizes phase change thermal energy storage and extraction, improving energy storage power generation efficiency. In particular, the design of adding a solar thermal supplementation system before the expander further improves power generation efficiency and is easy to commercially implement. The specific description is as follows:

[0005] A solar thermal supplementation and thermal storage power generation system includes a low-temperature energy storage system, a high-temperature energy storage system, a molten salt energy storage device, a first countercurrent heat exchanger, a compressor, an expander, a generator, a solar thermal supplementation system, and connecting pipelines between them;

[0006] The solar thermal supplementation system includes a solar thermal system, a medium-temperature solar thermal energy storage tank, a high-temperature solar thermal energy storage tank, a first circulating pump, a second circulating pump, a second counter-current heat exchanger, and connecting pipelines between them. The solar thermal system mainly includes a mirror field and a receiver. The first circulating pump is connected via a pipeline between the outlet of the medium-temperature solar thermal energy storage tank and the inlet of the receiver of the solar thermal system. The outlet of the receiver of the solar thermal system is connected to the inlet of the high-temperature solar thermal energy storage tank. The second circulating pump is connected between the inlet of the medium-temperature solar thermal energy storage tank and the outlet of the solar thermal energy storage medium channel of the second counter-current heat exchanger. The outlet of the high-temperature solar thermal energy storage tank is connected to the outlet of the second counter-current heat exchanger. The inlet of the solar thermal energy storage medium channel is connected; the inlet of the compressor and the outlet of the expander are both connected to port A of the low-temperature energy storage system; the inlet of the expander is connected to the steam medium outlet of the second counter-current heat exchanger; the inlet of the steam channel of the second counter-current heat exchanger is connected to one end of the steam channel of the first counter-current heat exchanger, and the outlet of the compressor is also connected to that end of the steam channel of the first counter-current heat exchanger; the other end of the steam channel of the first counter-current heat exchanger is connected to port B of the high-temperature energy storage system; both ends of the molten salt channel of the first counter-current heat exchanger are connected to the molten salt energy storage device; the expander is electrically connected to the generator.

[0007] Furthermore, the solar thermal supplementation and thermal storage power generation system also includes a heat dissipation device, which is installed between the outlet of the expander and port A of the cryogenic energy storage system.

[0008] Furthermore, the cryogenic energy storage system mainly includes a cryogenic hot water tank and two solenoid valves; a diverter is provided near the bottom of the cryogenic hot water tank, and a diversion port is provided on the top of the diverter; the outlet of the cryogenic hot water tank is connected to port A of the cryogenic energy storage system through a first solenoid valve; the diverter of the cryogenic hot water tank is connected to port A of the cryogenic energy storage system through a second solenoid valve; port A of the cryogenic energy storage system is connected to the compressor inlet and the expander outlet respectively.

[0009] Furthermore, the cryogenic energy storage system includes a cryogenic hot water tank, a cryogenic phase change heat storage tank, a first water pump, a third check valve, and connecting pipelines between them; the cryogenic phase change heat storage tank contains cryogenic phase change material, and heat transfer pipes are arranged around the cryogenic phase change material; one end of the heat transfer pipe inside the cryogenic phase change heat storage tank is connected to port A of the cryogenic energy storage system, and port A of the cryogenic energy storage system is connected to the inlet of the compressor and the outlet of the expander respectively; the first water pump and the third check valve are connected in parallel between the heat transfer pipe of the cryogenic phase change heat storage tank and the cryogenic hot water tank.

[0010] Furthermore, the high-temperature energy storage system includes a high-temperature hot water tank and two solenoid valves; a diverter is provided at the bottom of the high-temperature hot water tank, and a diversion port is provided on the top of the diverter; the outlet of the high-temperature hot water tank is connected to port B of the high-temperature energy storage system through a third solenoid valve, the diverter inside the high-temperature hot water tank is connected to port B of the high-temperature energy storage system through a fourth solenoid valve, and port B of the high-temperature energy storage system is connected to the steam channel of the counter-current heat exchanger.

[0011] Furthermore, the high-temperature energy storage system includes a high-temperature hot water tank, a high-temperature phase change heat storage tank, a second water pump, a fourth check valve, and connecting pipelines between them; the high-temperature phase change heat storage tank contains high-temperature phase change material, and heat transfer pipes are arranged around the high-temperature phase change material; one end of the heat transfer pipe inside the high-temperature phase change heat storage tank is connected to port B of the high-temperature energy storage system, and port B of the high-temperature energy storage system is connected to the steam channel of the first countercurrent heat exchanger; the outlets of the second water pump and the fourth check valve are connected to the high-temperature hot water tank, and the fourth check valve is connected in parallel between the heat transfer pipe of the high-temperature phase change heat storage tank and the high-temperature hot water tank.

[0012] Furthermore, the molten salt energy storage device includes a high-temperature molten salt tank, a low-temperature molten salt tank, a first molten salt pump, a second molten salt pump, a first one-way valve, a second one-way valve, and connecting pipelines between them; the first molten salt pump and the first one-way valve are connected in parallel between the high-temperature molten salt tank and the molten salt channel of the countercurrent heat exchanger; the second molten salt pump and the second one-way valve are connected in parallel between the low-temperature molten salt tank and the molten salt channel of the countercurrent heat exchanger.

[0013] Furthermore, the molten salt energy storage device includes a high-temperature molten salt tank, a low-temperature molten salt tank, a four-way valve, a second molten salt pump, and connecting pipelines between them; the high-temperature molten salt tank is directly connected to the molten salt channel in the countercurrent heat exchanger, and the four-way valve and the second molten salt pump are installed between the low-temperature molten salt tank and the countercurrent heat exchanger.

[0014] Furthermore, the solar thermal supplementation system includes a solar thermal system, a medium-temperature solar thermal energy storage tank, a high-temperature solar thermal energy storage tank, a first circulating pump, and connecting pipelines between them; the solar thermal system mainly includes a mirror field and a receiver; the first circulating pump is connected via a pipeline between the outlet of the medium-temperature solar thermal energy storage tank and the inlet of the receiver of the solar thermal system, and the outlet of the receiver of the solar thermal system is connected to the inlet of the high-temperature solar thermal energy storage tank; the high-temperature solar thermal energy storage tank is equipped with a steam medium heat transfer pipeline, and the two ends of the steam medium heat transfer pipeline are respectively connected to the inlet of the expander and the steam channel of the first countercurrent heat exchanger.

[0015] Furthermore, the compressor is a variable frequency compressor; the expander is a variable frequency expander.

[0016] Furthermore, the low-temperature hot water tank is also connected to a heat release valve, which is connected to a place that requires low-quality heat. The hot water in the low-temperature hot water tank can be used for different places such as low-temperature low-pressure power generation, winter heating, or industrial hot water.

[0017] The solar thermal supplementation and thermal storage power generation system of the present invention uses steam as the working medium and liquid molten salt as the thermal storage medium. By designing high and low temperature energy storage systems, and adding variable frequency compressors and variable frequency expanders to operate under different conditions according to working needs, phase change thermal energy storage and extraction are realized. In particular, the design of adding a solar thermal supplementation system in front of the expander further improves the power generation efficiency. This system not only improves working efficiency, but is also easy to implement commercially. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Appendix Figure 1 This is a schematic diagram of the first structure of the solar thermal supplementation and thermal storage power generation system of the present invention.

[0020] Appendix Figure 2 This is a schematic diagram of the second structure of the solar thermal supplementation and thermal storage power generation system of the present invention.

[0021] Appendix Figure 3 This is a schematic diagram of the third structure of the solar thermal supplementation and thermal storage power generation system of the present invention.

[0022] Appendix Figure 4 This is a schematic diagram of the fourth structure of the solar thermal supplementation and thermal storage power generation system of the present invention.

[0023] Appendix Figure 5 This is a schematic diagram of the fifth structure of the solar thermal supplementation and thermal storage power generation system of the present invention.

[0024] Appendix Figure 6 This is a schematic diagram of the sixth structure of the solar thermal supplementation and thermal storage power generation system of the present invention.

[0025] Appendix Figure 7 This is a schematic diagram of the seventh structure of the solar thermal supplementation and thermal storage power generation system of the present invention.

[0026] Appendix Figure 8 This is a schematic diagram of the eighth structure of the solar thermal supplementation and thermal storage power generation system of the present invention.

[0027] In the diagram: 100, Low-temperature energy storage system; 1, Low-temperature hot water tank; 200, High-temperature energy storage system; 2, High-temperature hot water tank; 31, High-temperature molten salt tank; 32, Low-temperature molten salt tank; 41, Medium-temperature solar thermal energy storage tank; 42, High-temperature solar thermal energy storage tank; 51, First counter-current heat exchanger; 52, Second counter-current heat exchanger; 6, Compressor; 7, Expander; 8, Generator; 91, First molten salt pump; 92, Second molten salt pump; 93, First circulation... Pump; 94. Second circulation pump; 101-105. Check valve; 106. Four-way valve; 111-114. Solenoid valve; 12. Heat release valve; 131-132. Diverter; 14. Photothermal system; 151. Low-temperature phase change heat storage tank; 152. High-temperature phase change heat storage tank; 161. First water pump; 162. Second water pump; 17. Heat dissipation equipment; 181. Photothermal heat transfer medium heat transfer pipeline; 182. Steam medium heat transfer pipeline. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below.

[0029] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. To facilitate understanding of the embodiments, various embodiments or implementation methods are provided below to illustrate the relevant devices, modules, and functions of this invention. Specific Implementation Method 1

[0032] As attached Figure 1As shown, a solar thermal energy storage and power generation system includes a low-temperature energy storage system 100, a high-temperature energy storage system 200, a molten salt energy storage device, a first counter-current heat exchanger 51, a compressor 6, an expander 7, a generator 8, a solar thermal energy storage system, and connecting pipelines between them. The solar thermal energy storage system includes a solar thermal system 14, a medium-temperature solar thermal energy storage tank 41, a high-temperature solar thermal energy storage tank 42, a first circulating pump 93, a second circulating pump 94, a second counter-current heat exchanger 52, and connecting pipelines between them. The solar thermal system 14 mainly includes a mirror field and a receiver. The first circulating pump 93 is connected via a pipeline between the outlet of the medium-temperature solar thermal energy storage tank 41 and the inlet of the receiver of the solar thermal system 14; the outlet of the receiver of the solar thermal system is connected to the inlet of the high-temperature solar thermal energy storage tank 42. The second circulating pump 94 is connected between the inlet of the medium-temperature solar thermal energy storage tank 41 and the outlet of the solar thermal energy storage medium channel of the second counter-current heat exchanger 52. The outlet of the high-temperature solar thermal energy storage tank 42 is connected to the outlet of the second counter-current heat exchanger 52. The inlet of the photothermal energy storage medium channel of 52 is connected; thus, during heat storage, the first circulation pump 93 draws the photothermal energy storage medium from the medium-temperature photothermal energy storage tank 41 and sends it into the absorber of the photothermal system 14. The photothermal energy storage medium absorbs the heat gathered by the mirror field of the photothermal system 14 and becomes a high-temperature photothermal energy storage medium. Finally, the high-temperature photothermal energy storage medium is sent into the high-temperature photothermal energy storage tank 42. When used for heat replenishment, driven by the second circulation pump 94, the high-temperature photothermal energy storage medium in the high-temperature photothermal energy storage tank 42 is sent into the photothermal energy storage medium channel of the second countercurrent heat exchanger 52 to exchange heat with the steam medium of the second countercurrent heat exchanger 52. The high-temperature photothermal energy storage medium releases heat and becomes medium-temperature, and then is stored in the medium-temperature photothermal energy storage tank 41.

[0033] The inlet of the compressor 6 and the outlet of the expander 7 are both connected to port A of the cryogenic energy storage system 100; the inlet of the expander 7 is connected to the steam medium outlet of the second countercurrent heat exchanger 52; the steam channel inlet of the second countercurrent heat exchanger 52 is connected to one end of the steam channel of the first countercurrent heat exchanger 51, and the outlet of the compressor 6 is also connected to that end of the steam channel of the first countercurrent heat exchanger 51; the other end of the steam channel of the first countercurrent heat exchanger 51 is connected to port B of the high-temperature energy storage system 200; both ends of the molten salt channel of the first countercurrent heat exchanger 51 are connected to the molten salt energy storage device; the expander 7 is connected to the generator 8.

[0034] As attached Figure 1As shown, the cryogenic energy storage system 100 mainly includes a cryogenic hot water tank 1 and two solenoid valves 111-112. A distributor 131 is located near the bottom of the cryogenic hot water tank 1, with a diversion port on its top. The function of the distributor 131 is to divert the cryogenic steam medium entering the cryogenic hot water tank 1 through the distributor 131, and then allow it to enter the bottom of the cryogenic hot water tank 1 through the diversion port. The cryogenic steam medium rises from the bottom of the cryogenic hot water tank 1, exchanging heat with the hot water in the tank. During this heat exchange, the cryogenic steam medium undergoes a phase change, becoming cryogenic hot water. The hot water in the cryogenic hot water tank 1 absorbs the heat from the cryogenic steam medium, causing its temperature to rise. The outlet of the cryogenic hot water tank 1 is connected to port A of the cryogenic energy storage system 100 through the first solenoid valve 111; the distributor 131 of the cryogenic hot water tank 1 is connected to port A of the cryogenic energy storage system 100 through the second solenoid valve 112; and port A of the cryogenic energy storage system 100 is connected to the inlet of the compressor 6 and the outlet of the heat dissipation device 17, respectively.

[0035] The molten salt energy storage device includes a high-temperature molten salt tank 31, a low-temperature molten salt tank 32, a first molten salt pump 91, a second molten salt pump 92, a first one-way valve 101, a second one-way valve 102, and connecting pipelines between them. The first molten salt pump 91 and the first one-way valve 101 are connected in parallel between the high-temperature molten salt tank 31 and the molten salt channel of the first counter-current heat exchanger 51. The second molten salt pump 92 and the second one-way valve 102 are connected in parallel between the low-temperature molten salt tank 32 and the molten salt channel of the first counter-current heat exchanger 51. The high-temperature molten salt tank 31 and the low-temperature molten salt tank 32 are installed below the first counter-current heat exchanger 51, forming a certain height difference. When the molten salt energy storage device stores heat, the second molten salt pump 92 draws molten salt from the low-temperature molten salt tank 32 and sends it into the molten salt channel of the first counter-current heat exchanger 51. The low-temperature molten salt absorbs heat from the steam medium in the first counter-current heat exchanger 51 and becomes high-temperature molten salt. Then, the high-temperature molten salt returns to the high-temperature molten salt tank 31 by gravity through the first one-way valve 101. When the molten salt energy storage device releases heat, the first molten salt pump 91 draws molten salt from the high-temperature molten salt tank 31 and sends it into the molten salt channel of the first counter-current heat exchanger 51. The high-temperature molten salt exchanges heat with the steam medium in the first counter-current heat exchanger 51 and becomes low-temperature molten salt. Then, the low-temperature molten salt returns to the low-temperature molten salt tank 32 by gravity through the second one-way valve 102.

[0036] The high-temperature energy storage system 200 includes a high-temperature hot water tank 2 and two solenoid valves 113-114. A diverter 132 is located at the bottom of the high-temperature hot water tank 2, and a diversion port is located on top of the diverter 132. The function of the diverter 132 is to divert the high-temperature steam medium entering the high-temperature hot water tank 2 through the diverter 132, and then allow it to enter the bottom of the high-temperature hot water tank 2 through the diversion port on the diverter 131. The high-temperature steam medium rises from the bottom of the high-temperature hot water tank 2 and exchanges heat with the medium-temperature hot water in the high-temperature hot water tank 2. During the heat exchange, the high-temperature steam medium undergoes a phase change, becoming high-temperature hot water. The medium-temperature hot water in the high-temperature hot water tank 2 absorbs heat from the high-temperature steam medium and becomes high-temperature hot water as well. The outlet of the high-temperature hot water tank 2 is connected to port B of the high-temperature energy storage system 200 through a third solenoid valve 113. The diverter 132 inside the high-temperature hot water tank 2 is connected to port B of the high-temperature energy storage system 200 through a fourth solenoid valve 114. Port B of the high-temperature energy storage system 200 is connected to the steam channel of the first counter-current heat exchanger 51.

[0037] The solar thermal supplementation and thermal storage power generation system described above also includes a heat dissipation device 17, which is installed between the outlet of the expander 7 and port A of the low-temperature energy storage system 100. The heat dissipation device is one of an air-cooled heat dissipation device, a cooling tower, or a plate heat exchanger for heat recovery. In this way, the medium-temperature steam after the expander 7 has done work is cooled by the heat dissipation device 17 and becomes low-temperature steam before entering the low-temperature energy storage system 100.

[0038] The heat dissipation device 17 described above is used in a heat recovery plate heat exchanger, where the recovered heat is used for heating, hot water supply, or industrial steam supply.

[0039] The compressor 6 is a variable frequency compressor; the expander 7 is a variable frequency expander.

[0040] The temperature of the photothermal energy storage medium in the high-temperature photothermal energy storage tank 42 is higher than the temperature of the molten salt medium in the high-temperature molten salt tank 31.

[0041] The solar thermal supplementation and thermal storage power generation system of this invention has two working modes: thermal storage working mode and power generation working mode.

[0042] In thermal storage mode: the first solenoid valve 111, the fourth solenoid valve 114, the compressor 6, the second molten salt pump 92, and the first circulation pump 93 are activated; the second solenoid valve 112, the third solenoid valve 113, the expander 7, the first molten salt pump 91, and the second circulation pump 94 are closed. Specifically, under the action of the compressor 6, the low-temperature hot water in the low-temperature hot water tank 1 is released through the first solenoid valve 111, undergoing a phase change to become low-temperature steam. This low-temperature steam then enters the compressor 6 and is compressed into high-temperature, high-pressure superheated steam. This high-temperature, high-pressure superheated steam enters the steam channel of the first counter-current heat exchanger 51. Simultaneously, the second molten salt pump 92 draws low-temperature molten salt from the low-temperature molten salt tank 32 and sends it into the molten salt channel of the first counter-current heat exchanger 51. The low-temperature molten salt absorbs the high-temperature, high-pressure superheated water in the steam channel of the first counter-current heat exchanger 51. The heat of the steam is converted into high-temperature molten salt, which is then sent to the high-temperature molten salt tank 31 via the first one-way valve 101. Meanwhile, the high-temperature and high-pressure superheated steam in the steam channel of the first countercurrent heat exchanger 51 is converted into high-temperature and high-pressure steam after quantitative heat release. The high-temperature and high-pressure steam then enters the high-temperature hot water tank 2 through the distributor 132 via the fourth solenoid valve 114 for diversion. It then enters the bottom of the high-temperature hot water tank 2 through the diversion port on the distributor 131. The high-temperature and high-pressure steam medium moves upward from the bottom of the high-temperature hot water tank 2 and exchanges heat with the medium-temperature and high-pressure hot water in the high-temperature hot water tank 2. The high-temperature and high-pressure steam medium undergoes a phase change during the heat exchange, becoming high-temperature and high-pressure hot water. The medium-temperature and high-pressure hot water in the high-temperature hot water tank 2 absorbs the heat of the high-temperature and high-pressure steam medium and becomes high-temperature and high-pressure hot water. Finally, the heat is stored in the high-temperature hot water tank 2 in the form of high-temperature and high-pressure hot water. Simultaneously, during the heat storage of the solar thermal supplement system, the first circulation pump 93 extracts the solar thermal energy storage medium from the medium-temperature solar thermal energy storage tank 41 and sends it into the heat absorber of the solar thermal system 14. The solar thermal energy storage medium absorbs the heat gathered by the mirror field of the solar thermal system 14 and becomes a high-temperature solar thermal energy storage medium. Finally, the high-temperature solar thermal energy storage medium is sent into the high-temperature solar thermal energy storage tank 42, thus completing the heat storage working mode of the entire system.

[0043] In power generation mode: the first solenoid valve 111, the fourth solenoid valve 114, the compressor 6, the second molten salt pump 92, and the first circulation pump 93 are closed; the second solenoid valve 112, the third solenoid valve 113, the expander 7, the first molten salt pump 91, and the second circulation pump 94 are open. Specifically, when the fourth solenoid valve 114 is opened, the high-temperature, high-pressure hot water in the high-temperature hot water tank 2 undergoes a phase change, becoming high-temperature, high-pressure steam. This high-temperature, high-pressure steam enters the steam channel of the first counter-current heat exchanger 51. Simultaneously, the first molten salt pump 91 draws high-temperature molten salt from the high-temperature molten salt tank 31 and sends it into the first counter-current heat exchanger. In the molten salt channel of the heat exchanger 51, high-temperature, high-pressure steam exchanges heat with medium-temperature molten salt in the first counter-current heat exchanger 51. The high-temperature molten salt releases heat and becomes low-temperature molten salt, which returns to the low-temperature molten salt tank 32 via the second one-way valve 102. At the same time, the high-temperature, high-pressure steam absorbs heat from the high-temperature molten salt in the molten salt channel of the first counter-current heat exchanger 51, thus completing the first heating of the high-temperature, high-pressure steam. The high-temperature, high-pressure steam after the first heating enters the steam channel of the second counter-current heat exchanger 52. Simultaneously, the second circulating pump 94 draws high-temperature solar thermal energy storage medium from the high-temperature solar thermal energy storage tank 42 and sends it to the second counter-current heat exchanger 52. The high-temperature solar thermal energy storage medium in the solar thermal energy storage medium channel exchanges heat with the steam medium in the second counter-current heat exchanger 52. The high-temperature solar thermal energy storage medium releases heat and becomes medium-temperature steam, which is then stored in the medium-temperature solar thermal energy storage tank 41. The high-temperature and high-pressure steam after the first heating absorbs heat from the high-temperature solar thermal energy storage medium in the second counter-current heat exchanger 52, completing the second heating. The high-temperature and high-pressure steam after the second heating finally enters the expander 7 to do work. The expander 7 converts thermal energy into mechanical energy to drive the generator 8 to generate electricity, ultimately realizing the conversion of thermal energy into electrical energy output. The steam after doing work is discharged through the expander 7, becoming medium-temperature steam, which is then used for steam generation. Steam enters the heat dissipation device 17 for cooling, turning into low-temperature steam. The low-temperature steam medium enters the distributor 131 inside the low-temperature hot water tank 1 through the second solenoid valve 112 for diversion. Then, it enters the bottom of the low-temperature hot water tank 1 through the diversion port on the distributor 131. The low-temperature steam medium moves upward from the bottom of the low-temperature hot water tank 1 and exchanges heat with the hot water in the low-temperature hot water tank 1. The low-temperature steam medium undergoes a phase change during the heat exchange, turning into low-temperature hot water. The hot water in the low-temperature hot water tank 1 absorbs the heat from the low-temperature steam medium, and its temperature rises slightly. Finally, the low-temperature hot water is stored in the low-temperature hot water tank 1, thus completing the power generation working mode.

[0044] In the power generation modes described above, except for the solar thermal supplementation system, the processes of sharing pipelines and equipment in other thermal storage and release modes are all reversible. Specific Implementation Method Two

[0046] like Figure 2 As shown, compared with Example 1 Figure 1In contrast, the molten salt energy storage device in the solar thermal supplementary heat storage power generation system of the present invention includes a high-temperature molten salt tank 31, a low-temperature molten salt tank 32, a four-way valve 106, a second molten salt pump 92, and connecting pipelines between them. The high-temperature molten salt tank 31 is directly connected to the molten salt channel in the first counter-current heat exchanger 51. The low-temperature molten salt tank 32 is connected to the first counter-current heat exchanger 51 by the four-way valve 106 and the second molten salt pump 92. The connections of other components are the same as in Embodiment 1. When the molten salt energy storage device stores heat, under the action of the second molten salt pump 92, the molten salt in the low-temperature molten salt tank 32 enters the second molten salt pump 92 through the four-way valve 106, and then is sent to the molten salt channel of the first counter-current heat exchanger 51 again through the four-way valve 106. The low-temperature molten salt absorbs the heat of the high-temperature and high-pressure superheated steam in the first counter-current heat exchanger 51 and becomes high-temperature molten salt. Then the high-temperature molten salt directly returns to the high-temperature molten salt tank 31. When the molten salt energy storage device releases heat, under the action of the second molten salt pump 92, the high-temperature molten salt in the high-temperature molten salt tank 31 is sent into the molten salt channel of the first counter-current heat exchanger 51. The high-temperature molten salt exchanges heat with the high-temperature and high-pressure steam of the first counter-current heat exchanger 51, and the high-temperature molten salt releases heat to become low-temperature molten salt. Then, the low-temperature molten salt returns to the low-temperature molten salt tank 32 through the four-way valve 106 and the second molten salt pump 92. The installation positions of the high-temperature molten salt tank 31 and the low-temperature molten salt tank 32 are not restricted. Figure 2 The working principle of the components in the solar thermal supplementary heat storage power generation system shown is the same as that in Embodiment 1, except for the molten salt energy storage device. Specific Implementation Method 3

[0048] As attached Figure 3 As shown, compared with the appendix in Example 1 Figure 1 In comparison, apart from the different internal structures of the cryogenic energy storage system 100 and the high-temperature energy storage system 200, the installation and operation principles of other components are the same as in Example 1.

[0049] In the appendix Figure 3 The cryogenic energy storage system 100 includes a cryogenic hot water tank 1, a cryogenic phase change heat storage tank 151, a first water pump 161, a third one-way valve 103, and connecting pipelines between them. The cryogenic phase change heat storage tank 151 contains cryogenic phase change material, and heat transfer pipes are arranged around the cryogenic phase change material. The inlet of the first water pump 161 is connected to the cryogenic hot water tank 1, and the outlet of the first water pump 161 is connected to the heat transfer pipes inside the cryogenic phase change heat storage tank 151. The inlet of the third one-way valve 103 is connected to the heat transfer pipes inside the cryogenic phase change heat storage tank 151, and the outlet of the third one-way valve 103 is connected to the cryogenic hot water tank 1. The other end of the heat transfer pipes inside the cryogenic phase change heat storage tank 151 is connected to port A of the cryogenic energy storage system 100, and port A of the cryogenic energy storage system 100 is connected to the inlet of the compressor 6 and the outlet of the expander 7, respectively.

[0050] The high-temperature energy storage system 200 includes a high-temperature hot water tank 2, a high-temperature phase change heat storage tank 152, a second water pump 162, a fourth one-way valve 104, and connecting pipelines between them. The high-temperature phase change heat storage tank 152 contains high-temperature phase change material, and heat transfer pipes are arranged around the high-temperature phase change material. The inlet of the second water pump 162 is connected to the high-temperature hot water tank 2, and the outlet of the second water pump 162 is connected to the heat transfer pipes inside the high-temperature phase change heat storage tank 152. The outlet of the fourth one-way valve 104 is connected to the high-temperature hot water tank 2, and the inlet of the fourth one-way valve 104 is connected to the heat transfer pipes inside the high-temperature phase change heat storage tank 152. The other end of the heat transfer pipes inside the high-temperature phase change heat storage tank 152 is connected to port B of the high-temperature energy storage system 200, and port B of the high-temperature energy storage system 200 is connected to the steam passage of the first counter-current heat exchanger 51.

[0051] The steam medium phase change thermal energy storage power generation system of the present invention has two working modes: thermal energy storage working mode and power generation working mode.

[0052] In thermal storage mode: the first water pump 161, compressor 6, second molten salt pump 92, and first circulation pump 93 are activated, while the second water pump 162, expander 7, first molten salt pump 91, and second circulation pump 94 are deactivated. Specifically, the first water pump 161 draws low-temperature hot water from the low-temperature hot water tank 1 and sends it to the low-temperature phase change thermal storage tank 151. The low-temperature hot water undergoes isothermal heat exchange with the low-temperature phase change material in the low-temperature phase change thermal storage tank 151. The low-temperature hot water absorbs heat from the low-temperature phase change material and becomes low-temperature, low-pressure steam. This low-temperature, low-pressure steam enters the compressor 6 and is compressed into high-temperature, high-pressure superheated steam. This high-temperature, high-pressure superheated steam enters the steam channel of the first counter-current heat exchanger 51. Simultaneously, the second molten salt pump 92 draws low-temperature molten salt from the low-temperature molten salt tank 32 and sends it to the molten salt channel of the first counter-current heat exchanger 51. The low-temperature molten salt absorbs heat from the high-temperature, high-pressure superheated steam in the steam channel of the first counter-current heat exchanger 51. The heat is converted into high-temperature molten salt, which then returns to the high-temperature molten salt tank 31 via the first one-way valve 101. Meanwhile, the high-temperature and high-pressure superheated steam in the steam channel of the first countercurrent heat exchanger 51 releases heat and becomes high-temperature and high-pressure steam. This high-temperature and high-pressure steam then enters the high-temperature phase change heat storage tank 152 and undergoes an isothermal phase change with the high-temperature phase change material in the tank. The high-temperature and high-pressure steam undergoes an isothermal phase change and becomes high-temperature and high-pressure hot water. Finally, the high-temperature and high-pressure hot water is sent to the high-temperature hot water tank 2 via the fourth one-way valve 104 to store the heat. At the same time, during the heat storage of the solar thermal supplementary heat system, the first circulating pump 93 draws the solar thermal energy storage medium from the medium-temperature solar thermal energy storage tank 41 and sends it to the absorber of the solar thermal system 14. The solar thermal energy storage medium absorbs the heat gathered by the mirror field of the solar thermal system 14 and becomes a high-temperature solar thermal energy storage medium. Finally, the high-temperature solar thermal energy storage medium is sent to the high-temperature solar thermal energy storage tank 42, thus completing the heat storage working mode of the entire system.

[0053] In power generation mode: the first water pump 161, compressor 6, second molten salt pump 92, and first circulation pump 93 are shut down; the second water pump 162, expander 7, first molten salt pump 91, and second circulation pump 94 are on. Specifically, the second water pump 162 draws high-temperature, high-pressure hot water from the high-temperature hot water tank 2 and sends it to the high-temperature phase change heat storage tank 152. The high-temperature, high-pressure hot water absorbs heat from the high-temperature phase change material in the high-temperature phase change heat storage tank 152 and transforms into high-temperature, high-pressure steam. This high-temperature, high-pressure steam then enters the first counter-current heat exchanger. The steam passage in 51 is used to simultaneously draw high-temperature molten salt from the high-temperature molten salt tank 31 into the molten salt passage of the first counter-current heat exchanger 51. The high-temperature, high-pressure steam exchanges heat with the high-temperature molten salt in the first counter-current heat exchanger 51, causing the high-temperature molten salt to release heat and become low-temperature molten salt. The low-temperature molten salt returns to the low-temperature molten salt tank 32 via the second one-way valve 102. Simultaneously, the high-temperature, high-pressure steam absorbs heat from the high-temperature molten salt in the molten salt passage of the first counter-current heat exchanger 51, thus completing the first heating of the high-temperature, high-pressure steam. After the first heating... High-temperature, high-pressure steam enters the steam channel of the second counter-current heat exchanger 52. Simultaneously, the second circulating pump 94 draws high-temperature solar thermal energy storage medium from the high-temperature solar thermal energy storage tank 42 and sends it into the solar thermal energy storage medium channel of the second counter-current heat exchanger 52 for heat exchange with the steam medium. The high-temperature solar thermal energy storage medium releases heat and becomes medium-temperature, then is stored in the medium-temperature solar thermal energy storage tank 41. After the first heating, the high-temperature, high-pressure steam absorbs heat from the high-temperature solar thermal energy storage medium in the second counter-current heat exchanger 52, completing the second heating process. The high-temperature, high-pressure steam after the second heating finally enters the expander 7 to do work. The expander 7 converts thermal energy into mechanical energy to drive the generator 8 to generate electricity, ultimately realizing the conversion of thermal energy into electrical energy output. The steam after doing work is discharged through the expander 7 and becomes medium-temperature steam. Then, the medium-temperature steam enters the heat dissipation device 17 for cooling and becomes low-temperature steam. The low-temperature steam medium enters the low-temperature phase change heat storage tank 151 to exchange heat with the low-temperature phase change material. The low-temperature water vapor isothermally releases heat and becomes low-temperature hot water, which is stored in the low-temperature hot water tank 1 through the third one-way valve 103.

[0054] The phase change material in the low-temperature phase change thermal storage tank 151 is a low-temperature solid-liquid phase change material. In the thermal storage working mode, the low-temperature phase change material releases heat isothermally and changes from liquid to solid. In the power generation working mode, the low-temperature phase change material absorbs heat isothermally and changes from solid to liquid.

[0055] The phase change material in the high-temperature phase change thermal storage tank 5 is a high-temperature solid-liquid phase change material. In the thermal storage working mode, the high-temperature phase change material absorbs heat isothermally and changes from solid to liquid. In the power generation working mode, the high-temperature phase change material releases heat isothermally and changes from liquid to solid. Specific Implementation Method Four

[0057] like Figure 4 As shown, compared with Example 3 Figure 3 In contrast, the molten salt energy storage device in the solar thermal supplementary heat storage power generation system of the present invention includes a high-temperature molten salt tank 31, a low-temperature molten salt tank 32, a four-way valve 106, a second molten salt pump 92, and connecting pipelines between them. The high-temperature molten salt tank 31 is directly connected to the molten salt channel in the first counter-current heat exchanger 51. The low-temperature molten salt tank 32 is connected to the first counter-current heat exchanger 51 by the four-way valve 106 and the second molten salt pump 92. The connections of other components are the same as in Embodiment 3. When the molten salt energy storage device stores heat, under the action of the second molten salt pump 92, the molten salt in the low-temperature molten salt tank 32 enters the second molten salt pump 92 through the four-way valve 106, and then is sent to the molten salt channel of the first counter-current heat exchanger 51 again through the four-way valve 106. The low-temperature molten salt absorbs the heat of the high-temperature and high-pressure superheated steam in the first counter-current heat exchanger 51 and becomes high-temperature molten salt. Then the high-temperature molten salt directly returns to the high-temperature molten salt tank 31. When the molten salt energy storage device releases heat, under the action of the second molten salt pump 92, the high-temperature molten salt in the high-temperature molten salt tank 31 is sent into the molten salt channel of the first counter-current heat exchanger 51. The high-temperature molten salt exchanges heat with the high-temperature and high-pressure steam of the first counter-current heat exchanger 51. The high-temperature and high-pressure steam absorbs heat and becomes superheated steam, while the high-temperature molten salt releases heat and becomes low-temperature molten salt. Then, the low-temperature molten salt returns to the low-temperature molten salt tank 32 through the four-way valve 106 and the second molten salt pump 92. The installation positions of the high-temperature molten salt tank 31 and the low-temperature molten salt tank 32 are not restricted. Figure 4 The working principle of the components in the solar thermal supplementary heat storage power generation system shown is the same as that in Embodiment 3, except for the molten salt energy storage device. Detailed Implementation Method Five

[0059] like Figure 5 As shown, compared with Example 1 Figure 1In contrast, the solar thermal supplementation system in the solar thermal power generation system of the present invention includes a solar thermal system 14, a medium-temperature solar thermal energy storage tank 41, a high-temperature solar thermal energy storage tank 42, a first circulation pump 93, and connecting pipelines between them; the solar thermal system 14 mainly includes a mirror field and a receiver; the first circulation pump 93 is connected by a pipeline between the outlet of the medium-temperature solar thermal energy storage tank 41 and the inlet of the receiver of the solar thermal system 14, and the outlet of the receiver of the solar thermal system is connected to the inlet of the high-temperature solar thermal energy storage tank 42; the high-temperature solar thermal energy storage tank 42 is provided with a steam medium heat transfer pipeline 182, the steam medium heat transfer... The two ends of the heat pipe 182 are connected to the inlet of the expander 7 and the steam channel of the first countercurrent heat exchanger 51, respectively. In this way, the working principle of the solar thermal supplementary heat storage power generation system is the same as that of Embodiment 1. When used for supplementary heating, the high-temperature and high-pressure steam after being heated for the first time by the high-temperature molten salt in the first countercurrent heat exchanger 51 directly enters the steam medium heat transfer pipe 182 in the high-temperature solar thermal energy storage tank 42 to absorb the heat of the high-temperature solar thermal energy storage medium and complete the second heating. The high-temperature and high-pressure steam after the second heating finally enters the expander 7 to do work. The working principle of other components is the same as that of Embodiment 1. Specific Implementation Method Six

[0061] like Figure 6 As shown, compared with Example 5 Figure 5 In comparison, the molten salt energy storage device in the solar thermal supplementary heat storage power generation system of the present invention includes a high-temperature molten salt tank 31, a low-temperature molten salt tank 32, a four-way valve 106, a second molten salt pump 92, and connecting pipelines between them. The high-temperature molten salt tank 31 is directly connected to the molten salt channel in the first countercurrent heat exchanger 51, and the low-temperature molten salt tank 32 is connected to the first countercurrent heat exchanger 51 by the four-way valve 106 and the second molten salt pump 92. The working mode of the molten salt energy storage device is the same as in Embodiment 2, and the connections of other components are the same as in Embodiment 5. Figure 6 The working principle of the components in the solar thermal supplementary heat storage power generation system shown is the same as that in Embodiment 5, except for the molten salt energy storage device. Detailed Implementation Method Seven

[0063] like Figure 7 As shown, compared with Example 3 Figure 3In contrast, the solar thermal supplementation system in the solar thermal power generation system of the present invention includes a solar thermal system 14, a medium-temperature solar thermal energy storage tank 41, a high-temperature solar thermal energy storage tank 42, a first circulation pump 93, and connecting pipelines between them; the solar thermal system 14 mainly includes a mirror field and a receiver; the first circulation pump 93 is connected by a pipeline between the outlet of the medium-temperature solar thermal energy storage tank 41 and the inlet of the receiver of the solar thermal system 14, and the outlet of the receiver of the solar thermal system is connected to the inlet of the high-temperature solar thermal energy storage tank 42; the high-temperature solar thermal energy storage tank 42 is equipped with a steam medium heat transfer pipe. The steam medium heat transfer pipe 182 is connected at both ends to the inlet of the expander 7 and the steam channel of the first countercurrent heat exchanger 51, respectively. In this way, when used for supplemental heating, the high-temperature and high-pressure steam after the first heating by the high-temperature molten salt in the first countercurrent heat exchanger 51 directly enters the steam medium heat transfer pipe 182 in the high-temperature solar thermal energy storage tank 42 to absorb the heat of the high-temperature solar thermal energy storage medium and complete the second heating. The high-temperature and high-pressure steam after the second heating finally enters the expander 7 to do work. The working principle of other components is the same as in Embodiment 3. Detailed Implementation Method Eight

[0065] like Figure 8 As shown, compared with Example 7 Figure 7 In comparison, the molten salt energy storage device in the solar thermal supplementary heat storage power generation system of the present invention includes a high-temperature molten salt tank 31, a low-temperature molten salt tank 32, a four-way valve 106, a second molten salt pump 92, and connecting pipelines between them; the connection method and working principle of the molten salt energy storage device are the same as those of the molten salt energy storage device in Embodiment 2. Figure 8 The working principle of the other components in the solar thermal supplementary heat storage power generation system shown is the same as that in Embodiment 7, except for the molten salt energy storage device.

[0066] In the above eight embodiments, one or more of the first check valve 101, the second check valve 102, the third check valve 103, and the fourth check valve 104 can be replaced by electric valves or solenoid valves.

[0067] The low-temperature hot water tank 1 is also connected to a heat release valve 12, which is connected to a place that requires low-quality heat. In this way, the hot water in the low-temperature hot water tank 1 can be used for different places such as low-temperature low-pressure power generation, winter heating or industrial hot water.

Claims

1. A solar thermal supplementation and thermal storage power generation system, characterized in that, The system includes a low-temperature energy storage system, a high-temperature energy storage system, a molten salt energy storage device, a first counter-current heat exchanger, a compressor, an expander, a generator, a solar thermal supplementation system, and connecting pipelines between them. The solar thermal supplementation system includes a solar thermal system, a medium-temperature solar thermal energy storage tank, a high-temperature solar thermal energy storage tank, a first circulating pump, a second circulating pump, a second counter-current heat exchanger, and connecting pipelines between them. The solar thermal system mainly includes a mirror field and a receiver. The first circulating pump is connected via a pipeline between the outlet of the medium-temperature solar thermal energy storage tank and the inlet of the receiver of the solar thermal system. The outlet of the receiver of the solar thermal system is connected to the inlet of the high-temperature solar thermal energy storage tank. During heat storage, the first circulating pump draws the solar thermal energy storage medium from the medium-temperature solar thermal energy storage tank and sends it to the receiver of the solar thermal system. The solar thermal energy storage medium absorbs the heat gathered by the mirror field of the solar thermal system and becomes a high-temperature solar thermal energy storage medium, which is then sent to the high-temperature solar thermal energy storage tank. The second circulating pump is connected between the inlet of the medium-temperature solar thermal energy storage tank and the outlet of the solar thermal energy storage medium channel of the second counter-current heat exchanger. The outlet of the high-temperature solar thermal energy storage tank is connected to the inlet of the solar thermal energy storage medium channel of the second counter-current heat exchanger. During heat replenishment, the second circulating pump draws the high-temperature solar thermal energy storage medium from the high-temperature solar thermal energy storage tank and sends it into the solar thermal energy storage medium channel of the second counter-current heat exchanger to exchange heat with the steam medium of the second counter-current heat exchanger. After the high-temperature solar thermal energy storage medium releases heat and becomes medium-temperature, it is stored in the medium-temperature solar thermal energy storage tank. The cryogenic energy storage system includes a cryogenic hot water tank, a cryogenic phase change thermal storage tank, and connecting pipelines between them. The cryogenic phase change thermal storage tank contains cryogenic phase change material, and heat transfer pipes are arranged around the cryogenic phase change material. One end of the heat transfer pipe inside the cryogenic phase change thermal storage tank is connected to port A of the cryogenic energy storage system, and the other end of the heat transfer pipe inside the cryogenic phase change thermal storage tank is connected to the cryogenic hot water tank. Port A of the cryogenic energy storage system is connected to the inlet of the compressor and the outlet of the expander. The phase change material in the cryogenic phase change thermal storage tank is a cryogenic solid-liquid phase change material. In the thermal storage mode, the cryogenic phase change material releases heat isothermally, changing from a liquid state to a solid state. In the power generation mode, the cryogenic phase change material absorbs heat isothermally, changing from a solid state to a liquid state. The inlet of the expander is connected to the steam medium outlet of the second counter-current heat exchanger; the steam channel inlet of the second counter-current heat exchanger is connected to one end of the steam channel of the first counter-current heat exchanger, and the outlet of the compressor is also connected to that end of the steam channel of the first counter-current heat exchanger; the high-temperature energy storage system includes a high-temperature hot water tank, a high-temperature phase change heat storage tank, and connecting pipelines between them; the high-temperature phase change heat storage tank contains a high-temperature phase change material, and heat transfer pipes are arranged around the high-temperature phase change material; one end of the heat transfer pipe inside the high-temperature phase change heat storage tank is connected to port B of the high-temperature energy storage system, and the other end of the heat transfer pipe inside the high-temperature phase change heat storage tank is connected to the high-temperature hot water tank; port B of the high-temperature energy storage system is connected to the other end of the steam channel of the first counter-current heat exchanger; the phase change material in the high-temperature phase change heat storage tank is a high-temperature solid-liquid phase change material. In thermal storage mode, the high-temperature phase change material absorbs heat isothermally, changing from a solid to a liquid state; in power generation mode, the high-temperature phase change material releases heat isothermally, changing from a liquid to a solid state; both ends of the molten salt channel of the first countercurrent heat exchanger are connected to the molten salt energy storage device; the molten salt energy storage device includes a high-temperature molten salt tank, a low-temperature molten salt tank, a first molten salt pump, a second molten salt pump, a first one-way valve, a second one-way valve, and connecting pipelines between them; the first molten salt pump and the first one-way valve are connected in parallel between the high-temperature molten salt tank and the molten salt channel of the first countercurrent heat exchanger; the second molten salt pump and the second one-way valve are connected in parallel between the low-temperature molten salt tank and the first countercurrent heat exchanger. Between the molten salt tank and the molten salt channel of the first countercurrent heat exchanger; the expander is electrically connected to the generator.

2. The solar thermal supplementation and thermal storage power generation system as described in claim 1, characterized in that, The solar thermal supplementation and thermal storage power generation system also includes heat dissipation equipment, which is installed between the outlet of the expander and port A of the cryogenic energy storage system.

3. The solar thermal supplementation and thermal storage power generation system as described in claim 1, characterized in that, The cryogenic energy storage system also includes a first water pump and a third check valve; the first water pump and the third check valve are connected in parallel between the heat transfer pipe of the cryogenic phase change thermal storage tank and the cryogenic hot water tank.

4. The solar thermal supplementation and thermal storage power generation system as described in claim 1, characterized in that, The high-temperature energy storage system also includes a second water pump and a fourth check valve; the second water pump and the fourth check valve are connected in parallel between the heat transfer pipe of the high-temperature phase change heat storage tank and the high-temperature hot water tank.

5. The solar thermal supplementation and thermal storage power generation system as described in claim 1, characterized in that, The cryogenic energy storage system mainly includes a cryogenic hot water tank and two solenoid valves; a diverter is provided near the bottom of the cryogenic hot water tank, and a diversion port is provided on the top of the diverter; the outlet of the cryogenic hot water tank is connected to port A of the cryogenic energy storage system through a first solenoid valve; the diverter of the cryogenic hot water tank is connected to port A of the cryogenic energy storage system through a second solenoid valve; port A of the cryogenic energy storage system is connected to the compressor inlet and the expander outlet respectively.

6. The solar thermal supplementation and thermal storage power generation system as described in claim 1, characterized in that, The high-temperature energy storage system includes a high-temperature hot water tank and two solenoid valves; a diverter is provided at the bottom of the high-temperature hot water tank, and a diversion port is provided on the top of the diverter; the outlet of the high-temperature hot water tank is connected to port B of the high-temperature energy storage system through a third solenoid valve, the diverter inside the high-temperature hot water tank is connected to port B of the high-temperature energy storage system through a fourth solenoid valve, and port B of the high-temperature energy storage system is connected to the steam channel of the first countercurrent heat exchanger.

7. The solar thermal supplementation and thermal storage power generation system as described in claim 1, characterized in that, The molten salt energy storage device includes a high-temperature molten salt tank, a low-temperature molten salt tank, a four-way valve, a second molten salt pump, and connecting pipelines between them; the high-temperature molten salt tank is directly connected to the molten salt channel in the first countercurrent heat exchanger, and the four-way valve and the second molten salt pump are installed between the low-temperature molten salt tank and the first countercurrent heat exchanger.

8. The solar thermal supplementation and thermal storage power generation system as described in claim 1, characterized in that, The compressor is a variable frequency compressor; the expander is a variable frequency expander.

9. The solar thermal supplementation and thermal storage power generation system as described in claim 1, characterized in that, The low-temperature hot water tank is also connected to a heat release valve, which is connected to a place with low-quality heat. The hot water in the low-temperature hot water tank is used for low-temperature and low-pressure power generation, winter heating, or industrial hot water applications.

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