A clean energy supply station system based on solar thermal power generation

Abstract

The present invention provides a clean energy supply station system based on solar thermal power generation, comprising: a solar thermal power generation system and a transcritical CO2 cycle system. Among them, the solar thermal power generation system includes a heat collection system, a heat storage system, a steam generation system and a steam turbine power generation system. The heat collection system converts solar energy into heat energy, which is stored by the heat storage system. The steam generation system uses the heat energy to generate steam meeting the operating requirements of the steam turbine. The steam is supplied to the steam turbine power generation system for power generation. The transcritical CO2 cycle system includes a compressor, a high-temperature gas cooler, a low-temperature gas cooler, a recuperator, an expansion valve, a first evaporator and a gas-liquid separator. Relying solely on the renewable solar energy resources, it is possible to achieve combined cooling, heating and power supply, which is stable, efficient, does not consume fossil energy, has zero greenhouse gas emissions, and the working medium is green, environmentally friendly and harmless.

Description

Technical Field

[0001] The present invention relates to the field of comprehensive energy utilization, and particularly to a clean energy supply station system based on solar thermal power generation. Background Art

[0002] Green and low-carbon is the direction of energy development. As one of the cleanest renewable energy sources, solar energy has great development and utilization prospects. Solar power generation is mainly divided into two methods: photovoltaic power generation and solar thermal power generation. Photovoltaic power generation can directly convert solar energy into electrical energy, but it is greatly affected by sunlight, and the current energy storage technology cannot ensure large-scale storage of electrical energy, resulting in instability of photovoltaic power generation. The energy conversion process of solar thermal power generation is solar energy - thermal energy - electrical energy, and the energy can be stored in the form of heat to meet the power generation needs at night. The power generation process is relatively stable and has high dispatchability. In the thermodynamic cycle of solar thermal power generation, there are huge losses at the cold end. If this part of heat is recycled, the energy utilization efficiency will be significantly improved.

[0003] At present, the demand for cooling and heating loads in residential life and small-scale industries is increasing continuously. An efficient and environmentally friendly cooling and heating combined supply system is urgently needed. The refrigerants in traditional refrigeration, heating, and air-conditioning systems contain hydrofluorocarbons (HFCs), chlorofluorocarbons (CFCs), and hydrochlorofluorocarbons (HCFCs). These refrigerants will damage the ozone layer and have a relatively high global warming potential (GWP). Summary of the Invention

[0004] The purpose of the present invention is to provide a clean energy supply station system based on solar thermal power generation, which can realize combined cooling, heating and power supply stably and efficiently only relying on renewable solar energy resources, without consuming fossil energy, with zero greenhouse gas emissions, and the working medium is green, environmentally friendly and harmless.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A clean energy supply station system based on solar thermal power generation, comprising: a solar thermal power generation system and a transcritical CO2 cycle system. Among them, the solar thermal power generation system includes a heat collection system, a heat storage system, a steam generation system and a steam turbine power generation system. The heat collection system converts solar energy into thermal energy, and the thermal energy is stored by the heat storage system. The steam generation system uses the thermal energy to generate steam meeting the operation requirements of the steam turbine, and the steam is supplied to the steam turbine power generation system for power generation. The transcritical CO2 cycle system includes a compressor, a high-temperature gas cooler, a low-temperature gas cooler, a recuperator, an expansion valve, a first evaporator and a gas-liquid separator. The compressor, the high-temperature gas cooler, the low-temperature gas cooler, the recuperator, the expansion valve, the first evaporator, the gas-liquid separator, the recuperator and the compressor are connected in sequence.

[0007] Further, in the above-mentioned clean energy supply station system based on solar thermal power generation, the heat collection system includes a heliostat field and a receiver. The receiver is arranged within the heliostat field. The heat storage system includes a heat storage medium, a high-temperature molten salt tank, a low-temperature molten salt tank, a high-temperature molten salt pump, and a low-temperature molten salt pump. The low-temperature heat storage medium is transported to the receiver through the low-temperature molten salt pump. After the heat storage medium absorbs heat in the receiver and becomes high-temperature molten salt, it enters the high-temperature molten salt tank for storage. The high-temperature heat storage medium is transported from the high-temperature molten salt tank to the steam generation system through the high-temperature molten salt pump for heat exchange. After heat exchange, the temperature of the heat storage medium decreases and becomes low-temperature heat storage medium, which then enters the low-temperature molten salt tank for storage.

[0008] Further, in the above-mentioned clean energy supply station system based on solar thermal power generation, the heat storage medium adopts a binary molten salt, specifically 40% KNO3 + 60% NaNO3.

[0009] Further, in the above-mentioned clean energy supply station system based on solar thermal power generation, the steam generation system includes a preheater, a third evaporator, a reheater, a superheater, and a steam drum. The high-temperature heat storage medium exchanges heat with feed water to generate superheated steam and reheated steam that meet the operating requirements of the steam turbine. The steam turbine power generation system includes a steam turbine, a generator, a ventilation cooling tower, and a second evaporator. The steam turbine power generation system converts thermal energy into electrical energy and provides electrical energy for the transcritical CO2 cycle system, and sends the excess electrical energy to the power grid.

[0010] Further, in the above-mentioned clean energy supply station system based on solar thermal power generation, the exhaust steam of the steam turbine is divided into two paths: one path goes to the ventilation cooling tower to be cooled into condensate, and the other path enters the second evaporator to provide heat source for the transcritical CO2 cycle system.

[0011] Further, in the above-mentioned clean energy supply station system based on solar thermal power generation, the circulating working medium used in the transcritical CO2 cycle system is CO2. The compressor has a compressor inlet and a compressor outlet. The working medium enters the compressor from the compressor inlet, is compressed into a high-temperature and high-pressure gas in the compressor, and is discharged from the compressor outlet. The high-temperature and high-pressure gas discharged from the outlet enters the high-temperature gas cooler for cooling heat exchange to produce high-temperature hot water. After cooling heat exchange in the high-temperature gas cooler, the working medium enters the low-temperature gas cooler to continue cooling heat exchange to produce low-temperature hot water.

[0012] Furthermore, in the above-mentioned clean energy supply station system based on solar thermal power generation, the regenerator has a high-temperature side inlet, a high-temperature side outlet, a low-temperature side inlet, and a low-temperature side outlet. The working fluid cooled and heat-exchanged in the low-temperature gas cooler enters the regenerator through the high-temperature side inlet to heat the working fluid entering through the low-temperature side inlet. The working fluid heated in the regenerator flows out through the low-temperature side outlet and enters the compressor. The working fluid entering the regenerator through the high-temperature side inlet is discharged through the high-temperature side outlet. The working fluid discharged through the high-temperature side outlet enters the expansion valve for throttling. The throttled liquid working fluid enters the first evaporator and absorbs heat and expands in the first evaporator. The working fluid that absorbs heat and expands in the first evaporator enters the gas-liquid separator from the first evaporator. The gaseous working fluid is discharged from the gas side outlet of the gas-liquid separator and enters the regenerator through the low-temperature side inlet to be heated.

[0013] Furthermore, in the above-mentioned clean energy supply station system based on solar thermal power generation, it further includes a cold user. The first evaporator transfers the cooling capacity to the medium to be cooled, and the medium to be cooled meets the cold capacity requirement of the cold user.

[0014] Furthermore, in the above-mentioned clean energy supply station system based on solar thermal power generation, the second evaporator can absorb the latent heat released by the condensation of the exhaust steam of the steam turbine.

[0015] Furthermore, in the above-mentioned clean energy supply station system based on solar thermal power generation, the compressor adopts a magnetic levitation centrifugal compressor, and the high-temperature gas cooler, the low-temperature gas cooler, the regenerator, and the first evaporator all adopt shell-and-tube heat exchangers.

[0016] Analysis shows that the present invention discloses a clean energy supply station system based on solar thermal power generation, achieving the following technical effects: 1. For the clean energy supply station system based on solar thermal power generation, the energy is completely provided by solar energy, enabling combined cooling, heating and power supply without consuming any fossil energy. 2. For the clean energy supply station system based on solar thermal power generation, the solar thermal power generation system has its own energy storage, which can ensure the continuous supply of energy for the energy station system. 3. For the clean energy supply station system based on solar thermal power generation, the working medium uses green and environmentally friendly carbon dioxide, which not only has no greenhouse gas emissions, but also can consume some greenhouse gases. 4. For the clean energy supply station system based on solar thermal power generation, a high-temperature gas cooler, a low-temperature gas cooler and a recuperator are provided, and multi-stage heat exchange improves the energy utilization rate. 5. For the clean energy supply station system based on solar thermal power generation, a high-temperature gas cooler and a low-temperature gas cooler are provided, which can meet the needs of various hot water users. 6. For the clean energy supply station system based on solar thermal power generation, a recuperator is provided to increase the superheat of the working medium at the compressor inlet, which can reduce the power consumption of the compressor. 7. For the clean energy supply station system based on solar thermal power generation, it can supply heat and cold simultaneously, and can significantly improve the coefficient of performance (COP) of the system compared with a single heating or cooling system. 8. For the clean energy supply station system based on solar thermal power generation, a magnetic levitation centrifugal compressor is used, which does not require lubricating oil, reduces the system complexity and is highly clean, environmentally friendly and safe. 9. For the clean energy supply station system based on solar thermal power generation, it can recover the latent heat released by the condensation of the exhaust steam of the steam turbine through the second evaporator, improving the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0018] Figure 1 Schematic block diagram of the structure of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present invention rather than limitation of the present invention. In fact, those skilled in the art will clearly understand that modifications and variations can be made to the present invention without departing from the scope or spirit of the present invention. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. Therefore, it is desirable that the present invention includes such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0020] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "connected", "connected to", and "disposed" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component; it can be a wired electrical connection, a radio connection, or a wireless communication signal connection. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numerical and alphabetical labels to refer to features in the drawings. Similar or like labels in the drawings and the description have been used to refer to similar or like parts of the present invention. As used herein, terms such as "first", "second", and "third" may be used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of individual components.

[0022] As Figure 1 shown, according to an embodiment of the present invention, there is provided a clean energy supply station system based on solar thermal power generation, including: a solar thermal power generation system and a transcritical CO2 cycle system. Among them, the solar thermal power generation system includes a heat collection system, a heat storage system, a steam generation system, and a steam turbine power generation system. The heat collection system converts solar energy into heat energy, and the heat energy is stored by the heat storage system. The steam generation system uses the heat energy to generate steam that meets the operating requirements of the steam turbine, and the steam is supplied to the steam turbine power generation system for power generation. The transcritical CO2 cycle system includes a compressor, a high-temperature gas cooler, a low-temperature gas cooler, a regenerator, an expansion valve, a first evaporator, and a gas-liquid separator. The compressor, the high-temperature gas cooler, the low-temperature gas cooler, the regenerator, the expansion valve, the first evaporator, the gas-liquid separator, the regenerator, and the compressor are connected in sequence.

[0023] The clean energy supply station system based on solar thermal power generation provided by the present invention can realize combined cooling, heat, and power supply only relying on renewable solar energy resources, which is stable and efficient, does not consume fossil energy, has zero greenhouse gas emissions, and the working medium is green, environmentally friendly, and harmless.

[0024] Preferably, the heat collection system includes a heliostat field and a receiver, and the receiver is disposed in the heliostat field.

[0025] The heat storage system includes a heat storage medium, a high-temperature molten salt tank, a low-temperature molten salt tank, a high-temperature molten salt pump, and a low-temperature molten salt pump. The low-temperature heat storage medium is transported to the absorber by the low-temperature molten salt pump. The heat storage medium absorbs heat in the absorber and becomes high-temperature molten salt, then enters the high-temperature molten salt tank for storage, completing the molten salt heat absorption process. The high-temperature heat storage medium is transported from the high-temperature molten salt tank to the steam generation system by the high-temperature molten salt pump for heat exchange. After heat exchange with steam and water, the temperature of the heat storage medium decreases and becomes low-temperature heat storage medium, which enters the low-temperature molten salt tank for storage, completing the molten salt heat release process, and then completing the molten salt system cycle.

[0026] Preferably, the heat storage medium is a binary molten salt, specifically 40% KNO3 + 60% NaNO3.

[0027] Preferably, the steam generation system includes a preheater, a third evaporator, a reheater, a superheater, and a steam drum. The high-temperature heat storage medium exchanges heat with feed water to generate superheated steam and reheated steam that meet the operating requirements of the steam turbine. The steam turbine power generation system includes a steam turbine, a generator, a ventilation cooling tower, and a second evaporator. The steam turbine power generation system converts thermal energy into electrical energy and provides electrical energy for the transcritical CO2 cycle system, and sends the excess electrical energy to the power grid.

[0028] Preferably, the exhaust steam of the steam turbine is divided into two paths: one path goes to the ventilation cooling tower to be cooled into condensate, and the other path enters the second evaporator to provide heat source for the transcritical CO2 cycle system.

[0029] The working mode of the solar thermal power generation system is as follows: The concentrating system uses a tower-type concentrator, mainly composed of a heliostat field and an absorber, which converts solar energy into thermal energy. The heat storage system consists of a heat storage medium, a high-temperature molten salt tank, a low-temperature molten salt tank, a high-temperature molten salt pump, a low-temperature molten salt pump, etc. The heat storage medium is a binary molten salt (40% KNO3 + 60% NaNO3). The main process of the heat storage system: The low-temperature molten salt is transported to the absorber by the low-temperature molten salt pump, absorbs heat and becomes high-temperature molten salt, then enters the high-temperature molten salt tank for storage, completing the molten salt heat absorption process. The high-temperature molten salt is transported from the high-temperature molten salt tank to the heat exchange system by the high-temperature molten salt pump, exchanges heat with steam and water, the temperature decreases and becomes low-temperature molten salt, and enters the low-temperature molten salt tank for storage, completing the molten salt heat release process, and then completing the molten salt system cycle. The steam generation system includes a preheater, an evaporator, a reheater, a superheater, etc., to realize the heat exchange between molten salt and steam and water, and generate superheated steam and reheated steam that meet the operating requirements of the steam turbine. The steam turbine power generation system converts thermal energy into electrical energy, can provide electrical energy for the transcritical CO2 cycle system, and sends the excess electrical energy to the power grid. The exhaust steam of the steam turbine can be divided into two paths, one path goes to the ventilation cooling tower to be cooled into condensate, and the other path enters the second evaporator to provide heat source for the transcritical CO2 cycle system.

[0030] Preferably, the circulating working fluid used in the transcritical CO2 cycle system is CO2. The compressor has a compressor inlet and a compressor outlet. The working fluid enters the compressor from the compressor inlet, is compressed into a high-temperature and high-pressure gas inside the compressor, and is discharged from the compressor outlet. The high-temperature and high-pressure gas discharged from the outlet enters the high-temperature gas cooler for cooling and heat exchange to produce high-temperature hot water. The temperature of the high-temperature hot water can reach 95°C, meeting the requirements of small-scale industries and high-temperature domestic hot water. The working fluid after cooling and heat exchange in the high-temperature gas cooler enters the low-temperature gas cooler for further cooling and heat exchange to produce low-temperature hot water, which can meet the heat demand for heating and other uses.

[0031] Preferably, the recuperator has a high-temperature side inlet, a high-temperature side outlet, a low-temperature side inlet, and a low-temperature side outlet. The working fluid after cooling and heat exchange in the low-temperature gas cooler enters the recuperator from the high-temperature side inlet to heat the working fluid entering from the low-temperature side inlet. The working fluid after being heated in the recuperator flows out from the low-temperature side outlet and enters the compressor. The working fluid increases the superheat degree of the working fluid at the compressor inlet and reduces the power consumption of the compressor. The working fluid entering the recuperator from the high-temperature side inlet is discharged from the high-temperature side outlet. The working fluid discharged from the high-temperature side outlet enters the expansion valve for throttling. The throttled liquid working fluid enters the first evaporator and absorbs heat and expands in the first evaporator. The working fluid that absorbs heat and expands in the first evaporator enters the gas-liquid separator from the first evaporator. The gaseous working fluid is discharged from the gas side outlet of the gas-liquid separator and enters the recuperator from the low-temperature side inlet to be heated. After being heated, the working fluid enters the compressor inlet to be compressed and continues the circulation process.

[0032] Preferably, it further includes a cold user. The first evaporator transfers the cooling capacity to the cooled medium (water), and the cooled medium meets the cold user's demand for cooling capacity.

[0033] Preferably, the second evaporator can absorb the latent heat released by the condensation of the exhaust steam of the steam turbine, achieving the purpose of waste heat recovery and utilization and improving the energy utilization rate.

[0034] Preferably, the compressor adopts a magnetic levitation centrifugal compressor, which does not require lubricating oil, reduces the system complexity, and is highly clean, environmentally friendly, and safe. The high-temperature gas cooler, low-temperature gas cooler, recuperator, first evaporator, and second evaporator all adopt shell-and-tube heat exchangers. Figure 1 Fittings such as manual valves, temperature sensors, pressure sensors, filters, etc., as well as the power distribution and control systems, are not listed.

[0035] The working mode of the transcritical CO2 cycle system is as follows: The circulating working fluid is CO2. The working fluid enters the compressor from the compressor inlet, is compressed into a high-temperature and high-pressure gas and discharged from the compressor outlet, and then enters the high-temperature gas cooler for cooling and heat exchange to produce high-temperature hot water. The temperature of the high-temperature hot water can reach 95°C, meeting the needs of small-scale industries and high-temperature domestic hot water. The working fluid at the outlet of the high-temperature gas cooler enters the low-temperature gas cooler to continue cooling and heat exchange to produce low-temperature hot water, which can meet the heating and other heat demand. The working fluid at the outlet of the low-temperature gas cooler then enters the high-temperature side of the regenerator to heat the working fluid at the low-temperature side at the compressor inlet, increasing the superheat degree of the working fluid at the compressor inlet and reducing the power consumption of the compressor. The working fluid at the outlet of the high-temperature side of the regenerator enters the expansion valve for throttling. The throttled liquid working fluid enters the evaporator, where it absorbs heat and expands. The system is provided with a first evaporator and a second evaporator. The first evaporator transfers the cooling capacity to the cooled medium (water) to meet the cooling demand of cold users such as air-conditioning systems. The second evaporator can absorb the latent heat released by the condensation of exhaust steam, achieving the purpose of waste heat recovery and utilization and improving the energy utilization rate. The working fluid at the outlet of the evaporator enters the gas-liquid separator. The gaseous working fluid enters the low-temperature side of the regenerator from the gas-side outlet of the gas-liquid separator, is heated, and then enters the compressor inlet to continue the cycle process.

[0036] CO2 is a natural refrigerant with good environmental protection, non-flammable, non-toxic, and non-corrosive, and its GWP is only 1. The transcritical CO2 cycle system can provide both a cold source and a heat source, is clean and environmentally friendly, has a high combined cooling and heating cycle efficiency, and has high application value.

[0037] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0038] 1. The clean energy supply station system based on solar thermal power generation is completely powered by solar energy and can achieve combined cooling, heating and power supply without consuming any fossil energy. 2. The clean energy supply station system based on solar thermal power generation has its own energy storage in the solar thermal power generation system, which can ensure the continuous supply of energy for the energy station system. 3. The clean energy supply station system based on solar thermal power generation uses carbon dioxide, which is green and environmentally friendly, as the working medium. It not only has no greenhouse gas emissions, but also can consume part of the greenhouse gas. 4. The clean energy supply station system based on solar thermal power generation is equipped with a high-temperature gas cooler, a low-temperature gas cooler and a recuperator, and the multi-stage heat exchange improves the energy utilization rate. 5. The clean energy supply station system based on solar thermal power generation is equipped with a high-temperature gas cooler and a low-temperature gas cooler, which can meet the needs of various hot water users. 6. The clean energy supply station system based on solar thermal power generation is equipped with a recuperator to increase the superheat of the working medium at the compressor inlet, which can reduce the power consumption of the compressor. 7. The clean energy supply station system based on solar thermal power generation can supply heat and cold at the same time, and can significantly improve the coefficient of performance (COP) of the system compared with a single heating or cooling system. 8. The clean energy supply station system based on solar thermal power generation uses a magnetic levitation centrifugal compressor, which does not require lubricating oil, reduces the system complexity and is highly clean, environmentally friendly and safe. 9. The clean energy supply station system based on solar thermal power generation can recover the latent heat released by the condensation of the exhaust steam of the steam turbine through the second evaporator, improving the energy utilization rate.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A clean energy supply station system based on solar thermal power generation, characterized in that, Comprising: A solar thermal power generation system and a transcritical CO2 cycle system, wherein, The solar thermal power generation system includes a heat collection system, a heat storage system, a steam generation system, and a steam turbine power generation system. The heat collection system converts solar energy into heat energy, which is stored by the heat storage system. The steam generation system uses the heat energy to generate steam that meets the operating requirements of the steam turbine, and the steam is supplied to the steam turbine power generation system for power generation. The transcritical CO2 cycle system includes a compressor, a high-temperature gas cooler, a low-temperature gas cooler, a recuperator, an expansion valve, a first evaporator, and a gas-liquid separator. The compressor, the high-temperature gas cooler, the low-temperature gas cooler, the recuperator, the expansion valve, the first evaporator, the gas-liquid separator, the recuperator, and the compressor are connected in sequence. The exhaust steam of the steam turbine is divided into two paths: one path is cooled to condensate water in a ventilation cooling tower, and the other path enters a second evaporator to provide heat source for the transcritical CO2 cycle system. The circulating working medium used in the transcritical CO2 cycle system is CO2. The heat collection system includes a heliostat field and a solar receiver, and the solar receiver is arranged in the heliostat field. The heat storage system includes a heat storage medium, a high-temperature molten salt tank, a low-temperature molten salt tank, a high-temperature molten salt pump, and a low-temperature molten salt pump. The low-temperature heat storage medium is transported to the solar receiver by the low-temperature molten salt pump. The heat storage medium absorbs heat in the solar receiver and becomes high-temperature molten salt, and then enters the high-temperature molten salt tank for storage. The high-temperature heat storage medium is transported from the high-temperature molten salt tank to the steam generation system for heat exchange by the high-temperature molten salt pump. After heat exchange, the temperature of the heat storage medium decreases and becomes low-temperature heat storage medium, and then enters the low-temperature molten salt tank for storage. The steam generation system includes a preheater, a third evaporator, a reheater, a superheater, and a steam drum. The high-temperature heat storage medium exchanges heat with feed water to generate superheated steam and reheated steam that meet the operating requirements of the steam turbine. The steam turbine power generation system includes a steam turbine, a generator, a ventilation cooling tower, and a second evaporator. The steam turbine power generation system converts heat energy into electrical energy and provides electrical energy for the transcritical CO2 cycle system. The steam turbine power generation system sends the excess electrical energy to the power grid. The recuperator has a high-temperature side inlet, a high-temperature side outlet, a low-temperature side inlet, and a low-temperature side outlet. The working medium cooled and heat-exchanged in the low-temperature gas cooler enters the recuperator through the high-temperature side inlet to heat the working medium entering through the low-temperature side inlet. The working medium heated in the recuperator flows out through the low-temperature side outlet and enters the compressor. The working medium entering the recuperator through the high-temperature side inlet is discharged through the high-temperature side outlet. The working medium discharged through the high-temperature side outlet enters the expansion valve for throttling. The throttled liquid working medium enters the first evaporator and absorbs heat and expands in the first evaporator. The working medium that absorbs heat and expands in the first evaporator enters the gas-liquid separator from the first evaporator. The gaseous working medium is discharged from the gas side outlet of the gas-liquid separator and enters the recuperator through the low-temperature side inlet to be heated.

2. The clean energy supply station system based on solar thermal power generation according to claim 1, wherein, The heat storage medium uses binary molten salt. The binary molten salt is specifically 40% KNO3 + 60% NaNO3.

3. The clean energy supply station system based on solar thermal power generation according to claim 1, characterized in that, The compressor used is a magnetic levitation centrifugal compressor.

4. The clean energy supply station system based on solar thermal power generation according to claim 1, characterized in that The compressor has a compressor inlet and a compressor outlet. The working medium enters the compressor from the compressor inlet, and the working medium is compressed into high-temperature and high-pressure gas in the compressor and discharged from the compressor outlet. The high-temperature and high-pressure gas discharged from the outlet enters the high-temperature gas cooler to be cooled and heat-exchanged to produce high-temperature hot water. The working medium cooled and heat-exchanged in the high-temperature gas cooler enters the low-temperature gas cooler to continue cooling and heat-exchanging to produce low-temperature hot water.

5. The clean energy supply station system based on solar thermal power generation according to claim 1, characterized in that It further includes a cold user, and the first evaporator transfers the cooling capacity to the medium to be cooled, and the medium to be cooled meets the cooling capacity demand of the cold user.

6. The clean energy supply station system based on solar thermal power generation according to claim 1, characterized in that The second evaporator can absorb the latent heat released by the condensation of the exhaust steam of the steam turbine.

7. The clean energy supply station system based on solar thermal power generation according to claim 1, characterized in that The high-temperature gas cooler, the low-temperature gas cooler, the recuperator and the first evaporator all adopt shell-and-tube heat exchangers.

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