Molten salt heat storage type photo-thermal and air energy storage coupling power generation system

Abstract

The invention provides a fused salt heat storage type photo-thermal and air energy storage coupled power generation system which comprises a fused salt heat storage type photo-thermal power generation system and an air energy storage power generation system, the fused salt heat storage type photo-thermal power generation system comprises a solar heat source, a fused salt energy storage unit and a power generator set, the fused salt energy storage unit comprises a cold salt storage tank and a hot salt storage tank, and the hot salt storage tank is connected with the air energy storage power generation system. The air energy storage power generation system comprises a compressor, a first fused salt-air heat exchanger, a second fused salt-air heat exchanger, an air storage device and an expansion generator, the generator set is connected with a motor of the compressor, and the cold salt storage tank, the first fused salt-air heat exchanger and the hot salt storage tank are sequentially connected through a first fused salt pipeline; the cold salt storage tank, the second fused salt-air heat exchanger and the hot salt storage tank are sequentially connected through a second fused salt pipeline. Switching of two power generation modes of photo-thermal power generation and air energy storage power generation can be achieved, the utilization rate of solar energy resources is effectively increased, the power generation amount of the photo-thermal power generation unit is increased, and the peak regulation capacity of the photo-thermal power generation unit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation systems, and in particular to a molten salt heat storage type solar thermal and air energy storage coupled power generation system. Background Art

[0002] Solar energy is an important renewable energy source. Solar thermal power generation is a technology that uses solar thermal energy to generate electricity. It has the advantages of good network connection, continuous heat storage, scale effect and clean production. It has been widely used in recent years.

[0003] At present, even when the sunshine duration is good, domestic solar thermal power stations often abandon light due to the capacity limitation of their own molten salt heat storage systems or the grid scheduling situation, resulting in the equipment of the solar thermal power generation system not being fully utilized and the equipment utilization rate being affected. Summary of the invention

[0004] The purpose of the present invention is to provide a molten salt heat storage type solar thermal and air energy storage coupled power generation system, which can solve the problem of abandoned light in existing solar thermal power generation systems.

[0005] The present invention provides a molten salt heat storage type solar thermal and air energy storage coupled power generation system, comprising:

[0006] A molten salt heat storage type solar thermal power generation system, comprising a solar heat source, a molten salt energy storage unit and a generator set, wherein the molten salt energy storage unit comprises a cold salt storage tank and a hot salt storage tank, the solar heat source is connected to the cold salt storage tank and the hot salt storage tank respectively, and the cold salt storage tank and the hot salt storage tank are connected to the generator set respectively;

[0007] An air energy storage power generation system includes a compressor, a first molten salt-air heat exchanger, a second molten salt-air heat exchanger, an air storage device and an expansion generator, wherein the generator set is connected to the motor of the compressor; the compressor, the first molten salt-air heat exchanger and the air storage device are connected in sequence through a first compressed air pipeline, and the air storage device, the second molten salt-air heat exchanger and the expansion generator are connected in sequence through a second compressed air pipeline; the cold salt storage tank, the first molten salt-air heat exchanger and the hot salt storage tank are connected in sequence through a first molten salt pipeline, and the cold salt storage tank, the second molten salt-air heat exchanger and the hot salt storage tank are connected in sequence through a second molten salt pipeline.

[0008] According to a molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention, the generator set includes a molten salt-water heat exchanger, a condenser and a steam turbine generator, the cold salt storage tank, the molten salt-water heat exchanger and the hot salt storage tank are connected in sequence through a third molten salt pipeline, and the condenser, the molten salt-water heat exchanger and the steam turbine generator are connected in sequence through a circulation pipeline.

[0009] According to a molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention, the circulation pipeline includes a steam pipeline, an exhaust pipeline and a condensed water pipeline, the molten salt-water heat exchanger and the steam turbine generator are connected through the steam pipeline, the steam turbine generator and the condenser are connected through the exhaust pipeline; the condenser and the molten salt-water heat exchanger are connected through the condensed water pipeline, and a water pump is provided on the condensed water pipeline.

[0010] According to a molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention, the steam turbine generator is connected to the electric motor through a power distribution device.

[0011] According to a molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention, the solar thermal source includes a heliostat and a heat absorber matched with the heliostat, the heliostat is used to refract and converge solar radiation to the heat absorber, and the heat absorber converts the received reflected solar radiation into thermal energy.

[0012] According to a molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention, the outlet of the heat absorber is connected to the inlet of the hot salt storage tank through a high-temperature molten salt pipeline, and a high-temperature molten salt pump is provided on the high-temperature molten salt pipeline; the inlet of the heat absorber is connected to the outlet of the cold salt storage tank through a low-temperature molten salt pipeline, and a low-temperature molten salt pump is provided on the low-temperature molten salt pipeline.

[0013] According to a molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention, the first molten salt pipeline includes a cold salt output pipeline and a hot salt input pipeline, the outlet of the cold salt storage tank and the molten salt inlet of the first molten salt-air heat exchanger are connected through the cold salt output pipeline, and the molten salt outlet of the first molten salt-air heat exchanger and the inlet of the hot salt storage tank are connected through the hot salt input pipeline.

[0014] According to a molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention, the second molten salt pipeline includes a hot salt output pipeline and a cold salt input pipeline, the outlet of the hot salt storage tank and the molten salt inlet of the second molten salt-air heat exchanger are connected through the hot salt output pipeline, and the molten salt outlet of the second molten salt-air heat exchanger and the inlet of the cold salt storage tank are connected through the cold salt input pipeline.

[0015] According to a molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention, a mixed temperature salt box is provided on the hot salt output pipeline, and the outlet of the cold salt storage tank is connected to the inlet of the mixed temperature salt box through a cold salt delivery pipeline.

[0016] According to a molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention, the third molten salt pipeline includes a high-temperature molten salt output pipeline and a low-temperature molten salt input pipeline, the outlet of the hot salt storage tank and the molten salt inlet of the molten salt-water heat exchanger are connected through the high-temperature molten salt output pipeline, and the molten salt outlet of the molten salt-water heat exchanger and the inlet of the cold salt storage tank are connected through the low-temperature molten salt input pipeline.

[0017] The molten salt heat storage type solar thermal and air energy storage coupled power generation system provided by the present invention includes a molten salt heat storage type solar thermal power generation system and an air energy storage power generation system, wherein the molten salt heat storage type solar thermal power generation system includes a solar heat source, a molten salt energy storage unit and a generator set, the molten salt energy storage unit includes a cold salt storage tank and a hot salt storage tank, the solar heat source is connected to the cold salt storage tank and the hot salt storage tank respectively, and the solar energy can be converted into molten salt thermal energy storage, the cold salt storage tank and the hot salt storage tank are connected to the generator set respectively, and the molten salt energy storage can be used to generate electricity; wherein the air energy storage power generation system includes a compressor, a first molten salt-air heat exchanger, a second molten salt-air heat exchanger, and an air storage device and an expansion generator, the generator set is connected to the motor of the compressor, so that the compressor is powered by the power generated by the molten salt heat storage type solar thermal power generation system; the compressor, the first molten salt-air heat exchanger and the gas storage device are connected in sequence through the first compressed air pipeline, the gas storage device, the second molten salt-air heat exchanger and the expansion generator are connected in sequence through the second compressed air pipeline, the cold salt storage tank, the first molten salt-air heat exchanger and the hot salt storage tank are connected in sequence through the first molten salt pipeline, and the cold salt storage tank, the second molten salt-air heat exchanger and the hot salt storage tank are connected in sequence through the second molten salt pipeline, so that compressed air energy storage power generation can be carried out. Therefore, the molten salt heat storage type solar thermal and air energy storage coupled power generation system of the present invention realizes the switching and alternating operation of the two power generation modes of molten salt heat storage type solar thermal power generation and air energy storage power generation by sharing the molten salt energy storage unit between the molten salt heat storage type solar thermal power generation system and the air energy storage power generation system, thereby reducing the loss of abandoned light, effectively improving the utilization rate of solar energy resources, increasing the power generation of the solar thermal power generation unit, and then increasing the peak-shaving capacity of the solar thermal power generation unit, and ultimately ensuring the long-term and effective operation of the solar thermal power generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the molten salt heat storage type solar thermal and air energy storage coupled power generation system of the present invention.

[0020] Description of reference numerals:

[0021] 1. Cold salt storage tank; 2. Hot salt storage tank; 3. Compressor; 31. Electric motor; 4. First molten salt-air heat exchanger; 5. Second molten salt-air heat exchanger; 6. Gas storage device; 7. Expansion generator; 8. Molten salt-water heat exchanger; 9. Condenser; 10. Steam turbine generator; 11. Water pump; 12. Power distribution device; 13. Heliostat; 14. Heat absorber; 15. Mixed temperature salt box. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figure 1 As shown, the molten salt heat storage type solar thermal and air energy storage coupled power generation system of an embodiment of the present invention includes a molten salt heat storage type solar thermal power generation system and an air energy storage power generation system.

[0026] The molten salt heat storage type solar thermal power generation system includes a solar heat source, a molten salt energy storage unit and a generator set. The molten salt energy storage unit includes a cold salt storage tank 1 and a hot salt storage tank 2. The solar heat source is connected to the cold salt storage tank 1 and the hot salt storage tank 2 respectively, and the solar energy can be converted into molten salt thermal energy for storage. The cold salt storage tank 1 and the hot salt storage tank 2 are connected to the generator set respectively, and molten salt energy storage power generation can be performed.

[0027] Among them, the air energy storage power generation system includes a compressor 3, a first molten salt-air heat exchanger 4, a second molten salt-air heat exchanger 5, a gas storage device 6 and an expansion generator 7. The generator set is connected to the motor 31 of the compressor 3, and the compressor 3 can be powered by the power generation of the molten salt heat storage type solar thermal power generation system. The compressor 3, the first molten salt-air heat exchanger 4 and the gas storage device 6 are connected in sequence through the first compressed air pipeline, the gas storage device 6, the second molten salt-air heat exchanger 5 and the expansion generator 7 are connected in sequence through the second compressed air pipeline, the cold salt storage tank 1, the first molten salt-air heat exchanger 4 and the hot salt storage tank 2 are connected in sequence through the first molten salt pipeline, and the cold salt storage tank 1, the second molten salt-air heat exchanger 5 and the hot salt storage tank 2 are connected in sequence through the second molten salt pipeline, so that compressed air energy storage power generation can be performed.

[0028] In the energy storage condition, the solar radiation is good, and the molten salt energy storage of the molten salt thermal storage type solar thermal power generation system is full and has the ability to generate electricity continuously. However, in the period of time when the power generation cannot be scheduled to be online, the power generation of the molten salt thermal storage type solar thermal power generation system can be used to connect the electric motor 31 of the air energy storage power generation system through the electrical equipment in the power plant to drive the compressor 3 to start compressing the air, and convert the electric energy that cannot be online into the potential energy and thermal energy of the air, wherein the air with potential energy (that is, high-pressure compressed air) is stored in the gas storage device 6, and the thermal energy of the air is heat-exchanged through the first molten salt-air heat exchanger 4, and the heat is transferred to the molten salt energy storage unit for storage. At the same time, since part of the energy stored in the molten salt energy storage unit is consumed in the process of compressing air by using solar thermal power generation, the molten salt energy storage unit has the capacity to continue to store light energy again. At this time, if the solar radiation is good, the mirror field heat collection system can be kept running, and the solar heat can be continuously collected and stored in the molten salt energy storage unit of the molten salt thermal storage type solar thermal power generation system, thereby solving the phenomenon of abandoning light.

[0029] In the power generation condition, the molten salt heat storage type CSP system generates electricity first until the heat energy in the molten salt energy storage unit is consumed and the CSP power generation is gradually shut down. At the same time, the air energy storage power generation system is started to heat the compressed air using the remaining heat energy in the molten salt energy storage unit that cannot be used for CSP, so that the high-pressure and low-temperature compressed air released from the air storage device 6 is heated to the temperature requirement of the inlet of the expansion generator 7 after heat exchange in the second molten salt-air heat exchanger 5, and then enters the expansion generator 7 to generate electricity.

[0030] Therefore, the molten salt heat storage type solar thermal and air energy storage coupled power generation system of the embodiment of the present invention realizes the switching and alternating operation of the two power generation modes of molten salt heat storage type solar thermal power generation and air energy storage power generation by sharing the molten salt energy storage unit between the molten salt heat storage type solar thermal power generation system and the air energy storage power generation system, thereby effectively reducing the loss of abandoned light, improving the utilization rate of solar energy resources, increasing the power generation of the solar thermal power generation unit, and then increasing the peak-shaving capacity of the solar thermal power generation unit, and ultimately ensuring the long-term and effective operation of the solar thermal power generation system.

[0031] In some embodiments of the present invention, the generator set includes a molten salt-water heat exchanger 8, a condenser 9 and a steam turbine generator 10, the cold salt storage tank 1, the molten salt-water heat exchanger 8 and the hot salt storage tank 2 are sequentially connected through a third molten salt pipeline, and the condenser 9, the molten salt-water heat exchanger 8 and the steam turbine generator 10 are sequentially connected through a circulation pipeline. That is, the molten salt-water heat exchanger 8 can use the molten salt thermal energy to heat the feed water and produce hot steam, and the steam turbine generator 10 then uses the hot steam to expand and do work, so that the blades rotate and drive the generator to generate electricity, and the exhaust steam after the steam turbine generator 10 does work enters the condenser 9 and condenses into water for repeated use by the generator set.

[0032] The circulation pipeline includes a steam pipeline, an exhaust pipeline and a condensed water pipeline. The molten salt-water heat exchanger 8 is connected to the steam turbine generator 10 through a steam pipeline to transport the hot steam generated by the molten salt-water heat exchanger 8 to the steam turbine generator 10 for expansion and work. The steam turbine generator 10 is connected to the condenser 9 through an exhaust pipeline to transport the exhaust steam after the steam turbine generator 10 works to the condenser 9 for condensation. The condenser 9 is connected to the molten salt-water heat exchanger 8 through a condensed water pipeline, and a water pump 11 is provided on the condensed water pipeline to pump the condensed water to the molten salt-water heat exchanger 8 for reuse.

[0033] In some embodiments of the present invention, the steam turbine generator 10 is connected to the motor 31 through the distribution device 12. The distribution device 12 is the original distribution device of the molten salt heat storage type solar thermal power generation system, which is used to transmit the power generated by the steam turbine generator 10 to the motor 31 of the compressor 3, thereby providing power for the motor 31 of the compressor 3.

[0034] In some embodiments of the present invention, the solar thermal source includes a heliostat 13 and a heat absorber 14 matched with the heliostat 13. The heliostat 13 is used to refract and focus the solar radiation to the heat absorber 14. The heat absorber 14 is used to receive the solar radiation focused by the heliostat 13 and convert the light energy into heat energy for heating the molten salt of the molten salt energy storage unit.

[0035] The outlet of the heat absorber 14 is connected to the inlet of the hot salt storage tank 2 through a high-temperature molten salt pipeline, and a high-temperature molten salt pump is provided on the high-temperature molten salt pipeline. The inlet of the heat absorber 14 is connected to the outlet of the cold salt storage tank 1 through a low-temperature molten salt pipeline, and a low-temperature molten salt pump is provided on the low-temperature molten salt pipeline. That is, under the action of the low-temperature molten salt pump, the low-temperature molten salt is transported from the cold salt storage tank 1 to the heat absorber 14 to absorb heat and become high-temperature molten salt, and then under the action of the high-temperature molten salt pump, the high-temperature molten salt in the heat absorber 14 is transported to the hot salt storage tank 2 for storage, thereby converting light energy into heat energy.

[0036] Specifically, the first molten salt pipeline includes a cold salt output pipeline and a hot salt input pipeline, the outlet of the cold salt storage tank 1 is connected to the molten salt inlet of the first molten salt-air heat exchanger 4 via the cold salt output pipeline, and the molten salt outlet of the first molten salt-air heat exchanger 4 is connected to the inlet of the hot salt storage tank 2 via the hot salt input pipeline. That is, the low-temperature molten salt in the cold salt storage tank 1 is transported to the first molten salt-air heat exchanger 4 to absorb air heat energy for heat exchange, and the heated high-temperature molten salt is then transported to the hot salt storage tank 2 for storage.

[0037] Specifically, the second molten salt pipeline includes a hot salt output pipeline and a cold salt input pipeline, the outlet of the hot salt storage tank 2 is connected to the molten salt inlet of the second molten salt-air heat exchanger 5 via the hot salt output pipeline, and the molten salt outlet of the second molten salt-air heat exchanger 5 is connected to the inlet of the cold salt storage tank 1 via the cold salt input pipeline. That is, the high-temperature molten salt in the hot salt storage tank 2 is transported to the second molten salt-air heat exchanger 5 for heating compressed air to achieve heat exchange, and the low-temperature molten salt after heat exchange is then transported to the cold salt storage tank 1 for storage.

[0038] A mixed temperature salt tank 15 is also provided on the hot salt output pipeline, and the outlet of the cold salt storage tank 1 is connected to the inlet of the mixed temperature salt tank 15 through the cold salt delivery pipeline. The mixed temperature salt tank 15 is added to mix the hot salt in the hot salt storage tank 2 with the cold salt in the cold salt storage tank 1 in a certain proportion, and the mixed molten salt is used to be delivered to the second molten salt-air heat exchanger 5, which can meet the temperature required for heating the high-pressure compressed air.

[0039] Specifically, the third molten salt pipeline includes a high-temperature molten salt output pipeline and a low-temperature molten salt input pipeline. The outlet of the hot salt storage tank 2 is connected to the molten salt inlet of the molten salt-water heat exchanger 8 via the high-temperature molten salt output pipeline, and the molten salt outlet of the molten salt-water heat exchanger 8 is connected to the inlet of the cold salt storage tank 1 via the low-temperature molten salt input pipeline. That is, the high-temperature molten salt in the hot salt storage tank 2 is transported to the molten salt-water heat exchanger 8 for heating condensed water to generate hot steam, and the low-temperature molten salt after heat exchange is then transported to the cold salt storage tank 1 for storage.

[0040] The working principle of the molten salt thermal storage type solar thermal and air energy storage coupled power generation system of the embodiment of the present invention is as follows:

[0041] During the energy storage stage, the abandoned electricity from solar thermal power generation is used to store compressed air energy.

[0042] The abandoned electricity of the molten salt thermal storage type solar thermal power generation system that has power generation energy but cannot be connected to the grid is used to compress the air, wherein the steam turbine generator 10 of the molten salt thermal storage type solar thermal power generation system is connected to the motor 31 of the compressor 3 through the power distribution device 12, providing power for the motor 31 of the compressor 3, and the high-pressure and high-temperature air output by the compressor 3 enters the first molten salt-air heat exchanger 4, and the high-pressure air is cooled by heat exchange to form high-pressure and low-temperature air and stored in the air storage device 6. At the same time, the low-temperature molten salt is output from the cold salt storage tank 1, and after heat exchange in the first molten salt-air heat exchanger 4, it is heated by the high-temperature air to become high-temperature molten salt, and then enters the hot salt storage tank 2 for storage.

[0043] During the energy release stage, the remaining molten salt thermal energy from solar thermal power generation is used to generate compressed air for electricity.

[0044] When the molten salt heat storage type solar thermal power generation system consumes the heat energy in the molten salt energy storage unit through power generation, the remaining heat energy in the hot salt storage tank 2 of the molten salt energy storage unit that cannot be used for solar thermal power generation can be further utilized. The remaining hot molten salt in the hot salt storage tank 2 is input into the mixed temperature salt box 15, and after being mixed with the cold molten salt input from the cold salt storage tank 1 in a certain proportion, the mixed temperature molten salt is input into the second molten salt-air heat exchanger 5, and heat is exchanged with the high-pressure and low-temperature air from the air storage device 6. The cooled molten salt is stored in the cold salt storage tank 1, and the heated high-pressure compressed air is sent to the expansion generator 7 to perform work and generate electricity.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A molten salt thermal storage type solar thermal and air energy storage coupled power generation system, characterized in that: include: A molten salt heat storage type solar thermal power generation system, comprising a solar heat source, a molten salt energy storage unit and a generator set, wherein the molten salt energy storage unit comprises a cold salt storage tank and a hot salt storage tank, the solar heat source is connected to the cold salt storage tank and the hot salt storage tank respectively, and the cold salt storage tank and the hot salt storage tank are connected to the generator set respectively; An air energy storage power generation system includes a compressor, a first molten salt-air heat exchanger, a second molten salt-air heat exchanger, an air storage device and an expansion generator, wherein the generator set is connected to the motor of the compressor; the compressor, the first molten salt-air heat exchanger and the air storage device are connected in sequence through a first compressed air pipeline, and the air storage device, the second molten salt-air heat exchanger and the expansion generator are connected in sequence through a second compressed air pipeline; the cold salt storage tank, the first molten salt-air heat exchanger and the hot salt storage tank are connected in sequence through a first molten salt pipeline, and the cold salt storage tank, the second molten salt-air heat exchanger and the hot salt storage tank are connected in sequence through a second molten salt pipeline.

2. The molten salt thermal storage type solar thermal and air energy storage coupled power generation system according to claim 1 is characterized in that: The generator set includes a molten salt-water heat exchanger, a condenser and a steam turbine generator. The cold salt storage tank, the molten salt-water heat exchanger and the hot salt storage tank are connected in sequence through a third molten salt pipeline, and the condenser, the molten salt-water heat exchanger and the steam turbine generator are connected in sequence through a circulation pipeline.

3. The molten salt thermal storage type solar thermal and air energy storage coupled power generation system according to claim 2 is characterized in that: The circulation pipeline includes a steam pipeline, an exhaust pipeline and a condensed water pipeline. The molten salt-water heat exchanger is connected to the steam turbine generator through the steam pipeline, and the steam turbine generator is connected to the condenser through the exhaust pipeline; the condenser is connected to the molten salt-water heat exchanger through the condensed water pipeline, and a water pump is provided on the condensed water pipeline.

4. The molten salt thermal storage type solar thermal and air energy storage coupled power generation system according to claim 2 is characterized in that: The steam turbine generator is connected to the electric motor through a power distribution device.

5. The molten salt thermal storage type solar thermal and air energy storage coupled power generation system according to claim 1 is characterized in that: The solar heat source includes a heliostat and a heat absorber matched with the heliostat. The heliostat is used to refract and focus solar radiation to the heat absorber, and the heat absorber converts the received reflected solar radiation into thermal energy.

6. The molten salt thermal storage type solar thermal and air energy storage coupled power generation system according to claim 5 is characterized in that: The outlet of the heat absorber is connected to the inlet of the hot salt storage tank through a high-temperature molten salt pipeline, and a high-temperature molten salt pump is provided on the high-temperature molten salt pipeline; the inlet of the heat absorber is connected to the outlet of the cold salt storage tank through a low-temperature molten salt pipeline, and a low-temperature molten salt pump is provided on the low-temperature molten salt pipeline.

7. The molten salt thermal storage type solar thermal and air energy storage coupled power generation system according to claim 1 is characterized in that: The first molten salt pipeline includes a cold salt output pipeline and a hot salt input pipeline. The outlet of the cold salt storage tank is connected to the molten salt inlet of the first molten salt-air heat exchanger via the cold salt output pipeline, and the molten salt outlet of the first molten salt-air heat exchanger is connected to the inlet of the hot salt storage tank via the hot salt input pipeline.

8. The molten salt thermal storage type solar thermal and air energy storage coupled power generation system according to claim 1 is characterized in that: The second molten salt pipeline includes a hot salt output pipeline and a cold salt input pipeline. The outlet of the hot salt storage tank is connected to the molten salt inlet of the second molten salt-air heat exchanger via the hot salt output pipeline, and the molten salt outlet of the second molten salt-air heat exchanger is connected to the inlet of the cold salt storage tank via the cold salt input pipeline.

9. The molten salt thermal storage type solar thermal and air energy storage coupled power generation system according to claim 8 is characterized in that: A mixed-temperature salt box is arranged on the hot salt output pipeline, and the outlet of the cold salt storage tank is connected to the inlet of the mixed-temperature salt box through a cold salt delivery pipeline.

10. The molten salt thermal storage type solar thermal and air energy storage coupled power generation system according to claim 2 is characterized in that: The third molten salt pipeline includes a high-temperature molten salt output pipeline and a low-temperature molten salt input pipeline. The outlet of the hot salt storage tank is connected to the molten salt inlet of the molten salt-water heat exchanger via the high-temperature molten salt output pipeline, and the molten salt outlet of the molten salt-water heat exchanger is connected to the inlet of the cold salt storage tank via the low-temperature molten salt input pipeline.

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