Photoelectric complementary efficient compressed air energy storing and discharging and drying system and operation method

Abstract

The photoelectric complementary efficient compressed air energy storing, discharging and drying system comprises an energy storage module used for storing energy, the energy storage module comprises multiple stages of air compressors and second heat exchangers which are alternately connected in series, and the second heat exchanger located at the last stage is connected with an air storage tank through a second valve; the gas storage tank is connected with an energy releasing module for releasing energy; the energy releasing module is connected with the drying module; the system further comprises a photovoltaic photo-thermal collection application module. The high-temperature phase change energy storage device is adopted to transfer heat generated during air compression to the air for expansion power generation, so that the power generation capacity and the power generation efficiency of the system can be improved, meanwhile, due to the fact that in the air compression process, a large amount of water vapor is condensed into liquid water, the moisture content is reduced, and in the air constant-pressure heating process, the energy consumption is reduced. And the relative humidity in the air is further reduced. Therefore, the moisture content of the air is extremely low, and the air can become dry gas with a good effect, so that the productivity and the economic benefit of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive energy storage applications, and particularly relates to a high-efficiency compressed air energy storage, release, and drying system with complementary photoelectricity and its operation method. Background Art

[0002] Compressed air energy storage is a relatively cutting-edge research direction at present. An air compressor is used to compress atmospheric air into high-pressure air, which is stored at the bottom of a lake or in a culvert. When needed, it is released and an expander is used for power generation. However, traditional compressed air energy storage systems still have many problems, such as low efficiency, single energy production, large power consumption of the air compressor, and small power generation of the system. Therefore, it is very necessary to develop a comprehensive application system for compressed air energy storage that is efficient, multi-purpose, and rich in energy production. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-efficiency compressed air energy storage, release, and drying system with complementary photoelectricity and its operation method. During the low electricity consumption period, the system consumes the redundant electric energy of the power grid through a multi-stage air compressor to compress atmospheric air into high-pressure air in stages and store it at the bottom of a lake. During the high electricity consumption period, the high-pressure air at the bottom of the lake is released, and electricity is generated by an expander and a generator and transmitted to the power grid for end-users. Since a large amount of heat is generated during the process of compressing air, and in the process of expanding and generating electricity with high-pressure air, if the high-pressure air is further heated, the system can generate more electric energy. Therefore, the present invention uses a high-temperature phase change energy storage device to transfer the heat generated during air compression to the air for expansion power generation, thereby improving the power generation and power generation efficiency of the system. At the same time, since a large amount of water vapor condenses into liquid water during the process of compressing air, the moisture content decreases, and during the constant pressure heating process of air, the relative humidity of the air further decreases. Therefore, at this time, the moisture content of the air is extremely low and can become a very good drying gas, thereby improving the energy production and economic benefits of the system.

[0004] To achieve the above technical features, the purpose of the present invention is realized as follows: A high-efficiency compressed air energy storage, release, and drying system with complementary photoelectricity includes an energy storage module for energy storage. The energy storage module includes a multi-stage air compressor and a second heat exchanger connected in series alternately. The second heat exchanger at the last stage is connected to a gas storage tank through a second valve; The gas storage tank is connected to an energy release module for energy release; The energy release module is connected to a drying module; It also includes a photovoltaic and solar thermal collection and application module.

[0005] Preferably, the air compressor includes an air compressor of the first stage, an air compressor of the second stage,..., an air compressor of the nth stage, a total of n stages; The second heat exchanger includes a second heat exchanger of the first stage, a second heat exchanger of the second stage,..., a second heat exchanger of the nth stage, a total of n stages; The inlet of the first-stage compressor is connected to air, and the outlet is connected to the inlet pipeline of the high-temperature side of the first-stage second heat exchanger. The outlet pipeline of the high-temperature side of the first-stage second heat exchanger is connected to the next-stage second-stage compressor for further compression. The compressed air enters the second-stage second heat exchanger. The multi-stage compressors and heat exchangers are connected in this form. The high-temperature and high-pressure air coming out of the last n-stage compressor is connected to the inlet of the high-temperature side of the n-stage second heat exchanger. The low-temperature and high-pressure air at the outlet of the high-temperature side of the last n-stage second heat exchanger enters the gas storage tank after passing through the second valve, and the gas storage tank is connected to the bottom of the lake.

[0006] Preferably, the energy-releasing module includes a fifth heat exchanger. The inlet pipeline of the low-temperature side of the fifth heat exchanger is connected to the gas storage tank through a third valve. The outlet of the low-temperature side of the fifth heat exchanger is connected to the inlet pipeline of the low-temperature side of the fourth heat exchanger. The outlet of the low-temperature side of the fourth heat exchanger is alternately connected in series with multiple-stage expanders and a first heat exchanger in sequence; each stage of expander is correspondingly equipped with a stage of generator; the last-stage expander is connected to the drying module.

[0007] Preferably, the expander includes a total of n stages, namely a first-stage expander, a second-stage expander,..., an n-stage expander; The generator includes a total of n stages, namely a first-stage generator, a second-stage generator,..., an n-stage generator; The first heat exchanger includes a total of n stages, namely a first-stage first heat exchanger, a second-stage first heat exchanger,..., an n-stage first heat exchanger; The outlet pipeline of the low-temperature side of the fourth heat exchanger is connected to the first-stage expander. The first-stage expander is equipped with a first-stage generator to perform expansion power generation of high-pressure air in this way. The outlet of the first-stage expander is connected to the inlet of the low-temperature side of the first-stage first heat exchanger. The outlet of the low-temperature side of the first-stage first heat exchanger is connected to the inlet of the second-stage expander. The high-pressure air after the first expansion and pressure reduction is heated in the first-stage first heat exchanger and then enters the second-stage expander again for secondary expansion power generation. The high-pressure air after the secondary expansion power generation is connected to the inlet pipeline of the low-temperature side of the second-stage first heat exchanger. The multi-stage expanders and heat exchangers are connected in this form. The air leaving the last n-stage expander becomes low-temperature and low-pressure air and is then connected to the drying module loop.

[0008] Preferably, the photovoltaic and solar-thermal collection and application module includes a photovoltaic conversion device. A battery pack is connected after the photovoltaic conversion device. The battery pack is connected to the first circulation pump, the second circulation pump, the third circulation pump, the compressor, and the compressor through wires and provides driving electric energy for them during the operation of the system.

[0009] Preferably, the photovoltaic and solar thermal collection application module further includes a focusing high-temperature solar thermal collector. The heat medium outlet of the focusing high-temperature solar thermal collector is respectively connected to the inlet of the high-temperature side of the fifth heat exchanger and the inlet of the high-temperature phase change energy storage device. The outlet of the high-temperature side of the fifth heat exchanger is connected to the inlet of the third circulation pump after passing through the fourth valve. The outlet of the high-temperature phase change energy storage device is connected to the inlet of the third circulation pump after passing through the fifth valve. The outlet of the third circulation pump is connected to the heat medium inlet of the focusing high-temperature solar thermal collector.

[0010] Preferably, the drying module includes a cooling and heating dual-effect heat pump circuit and a drying circulation circuit. The cooling and heating dual-effect heat pump circuit is composed of a compressor, a condenser, an expansion valve, and an evaporator connected in series. The drying circulation circuit is as follows: The air outlet from the last-stage n-stage expander is connected to the inlet of the low-temperature side of the condenser. The outlet of the low-temperature side of the condenser is connected to the inlet of the high-temperature drying area. The outlet of the high-temperature drying area is connected to the inlet of the high-temperature side of the third heat exchanger. The outlet of the high-temperature side of the third heat exchanger is connected to the inlet of the high-temperature side of the evaporator. The outlet of the high-temperature side of the evaporator is connected to the inlet of the low-temperature side of the third heat exchanger. The outlet of the low-temperature side of the third heat exchanger is connected to the inlet of the low-temperature drying area. The outlet of the low-temperature drying area is directly communicated with the ambient air.

[0011] Preferably, the energy storage module further includes a seventh valve and an eighth valve. The seventh valve, the second circulation pump, the high-temperature phase change energy storage device, the eighth valve, and the second heat exchanger form a series circuit.

[0012] Preferably, the energy release module further includes a first valve and a sixth valve. The first valve, the first circulation pump, the high-temperature phase change energy storage device, the sixth valve, the first heat exchanger, and the fourth heat exchanger form a series circuit.

[0013] On the other hand, the present invention provides an operation method for an efficient compressed air energy storage, release, and drying system with photoelectric complementarity. The operation method is implemented by using an efficient compressed air energy storage, release, and drying system with photoelectric complementarity, and includes: During the off-peak electricity consumption period, the system mainly consumes the redundant electric energy of the power grid to achieve the energy storage function: The second valve opens, and air enters the first-stage compressor to consume the excess electrical energy of the power grid for compression. After compression, the temperature of the air rises. The heat is transferred to the high-temperature phase change energy storage device through the first second heat exchanger of the first stage. Then it enters the second-stage compressor for compression, and then enters the second second heat exchanger of the second stage for heat transfer. Then, air compression is carried out successively at the 3rd, 4th, and up to the nth stage. The process is the same as that of the first stage and the second stage. At this time, the seventh valve and the eighth valve of the high-temperature phase change energy storage device are opened. The circulating working medium, heat-conducting oil, flows through the second heat exchangers of each stage under the action of the second circulation pump and then converges together to store the heat in the high-temperature phase change energy storage device. The high-pressure air after n-stage compression and heat exchange is stored in the gas storage tank. The gas storage tank is connected to the bottom of the lake, and the output high-pressure gas is at a constant pressure. During the peak electricity consumption period, the system mainly realizes the energy release function. The third valve opens to release the high-pressure air from the gas storage tank. After being preheated by the fifth heat exchanger and heated by the fourth heat exchanger, the high-pressure air enters the first-stage expander through the pipeline to perform expansion work on the high-pressure air and drive the first-stage generator to generate electricity. Subsequently, the air absorbs the heat in the high-temperature phase change energy storage device through the first first heat exchanger of the first stage to increase the air pressure, which is conducive to the expansion power generation of the next stage. The high-pressure gas continues to enter the second-stage expander for secondary expansion and drives the second-stage generator to generate electricity. Then, expansion power generation is carried out successively at the 3rd, 4th, and up to the nth stage, and the electricity generated at each stage is transmitted to the power grid for end-users to use. The process is the same as that of the first stage and the second stage. At this time, the first valve and the sixth valve of the high-temperature phase change energy storage device are opened. The circulating working medium, heat-conducting oil, flows through the first heat exchangers of each stage and the fourth heat exchanger under the action of the first circulation pump, and then converges together and returns to the high-temperature phase change energy storage device to transfer the heat from the high-temperature phase change energy storage device to the high-pressure gas. The heat required for preheating the fifth heat exchanger is provided by the focused high-temperature solar thermal collector, which converts solar energy into heat and then transfers it to the fifth heat exchanger. If power generation is not required at this time, the fifth valve opens to transfer the converted heat to the high-temperature phase change energy storage device. The electricity generated by all generators is aggregated and transported to the power grid for power distribution. The gas coming out of the nth-stage expander of the last stage becomes low-pressure and low-humidity air and enters the condenser to absorb heat. It becomes low-humidity and high-temperature humid air with extremely strong moisture absorption and dehumidification ability in the condenser, and then enters the high-temperature drying area for high-temperature drying and dehumidification to become high-temperature and high-humidity air. Then it enters the third heat exchanger to release heat and cool down to achieve dehumidification by condensation and dew formation, and then undergoes secondary deep cooling and condensation dehumidification on the high-temperature side of the evaporator. At this time, the moisture content is further reduced to become extremely low-temperature saturated humid air. Then it passes through the low-temperature side of the third heat exchanger, absorbs heat, the temperature rises, and the relative humidity drops sharply to become low-temperature and low-humidity air. At this time, the air can be used for low-temperature drying. The equipment that needs to be driven by electricity in this system is provided by the photovoltaic conversion device and the battery pack to meet the operating conditions of the system and make full use of solar energy.

[0014] The present invention has the following beneficial effects: 1. The present invention combines complementary solar thermal, photovoltaic, and grid electric energy, and uses compressed air to complete functions such as energy storage, energy release, and drying, realizing the complementarity and flexible conversion application among light, heat, electricity, and storage, achieving the effect of peak shaving and valley filling in the power grid power consumption process, and effectively reducing the power grid load.

[0015] 2. The present invention can improve the comprehensive utilization rate of the power grid and bring better economic benefits to users. The application of energy storage technology helps to improve the flexibility of the power system, solve the contradiction between power supply and demand mismatch, and at the same time can also couple the development of clean energy, reducing energy waste caused by peak and valley power demands.

[0016] 3. The system of the present invention can continuously optimize power balance management, scientifically formulate countermeasures for the balance between power generation, supply, and consumption, further improve the power grid management and energy utilization level, and is of great significance for reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] Figure 1 It is a system diagram of the present invention.

[0019] In the figure: expander 1, generator 2, compressor 3, first heat exchanger 4, first valve 5.I, sixth valve 5.II, seventh valve 5.III, eighth valve 5.IV, high-temperature phase change energy storage device 6, first circulation pump 7.I, second circulation pump 7.II, second heat exchanger 8, condenser 9, compressor 10, expansion valve 11, evaporator 12, third heat exchanger 13, high-temperature drying area 14, low-temperature drying area 15, gas storage tank 16, fourth heat exchanger 17, second valve 18, third valve 19, fifth heat exchanger 20, fourth valve 21, focusing high-temperature solar thermal collector 22, third circulation pump 23, fifth valve 24, photovoltaic conversion device 25, battery pack 26; First-stage compressor 3.I, second-stage compressor 3.II,... n-stage compressor 3.n; First-stage second heat exchanger 8.I, second-stage second heat exchanger 8.II,... n-stage second heat exchanger 8.n; First-stage expander 1.I, second-stage expander 1.II,... n-stage expander 1.n; First-stage generator 2.I, second-stage generator 2.II,... n-stage generator 2.n; First-stage first heat exchanger 4.I, second-stage first heat exchanger 4.II,... n-stage first heat exchanger 4.n. DETAILED DESCRIPTION OF THE INVENTION

[0020] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Embodiment 1: Referring to Figure 1 , a high-efficiency compressed air energy storage, release, and drying system with photoelectric complementarity. During the low electricity consumption period, this system uses a multi-stage compressor to compress atmospheric air into high-pressure air in stages and stores it at the bottom of a lake. During the high electricity consumption period, the high-pressure air at the bottom of the lake is released to generate electricity through an expander and a generator. Since a large amount of heat is generated during the compression of compressed air, and during the expansion power generation process of high-pressure air, if the high-pressure air is further heated, the system can generate more electrical energy. Therefore, the present invention uses a high-temperature phase change energy storage device to transfer the heat generated during the compression of compressed air to the air for expansion power generation, thereby improving the power generation capacity and power generation efficiency of the system. At the same time, during the compression of compressed air, a large amount of water vapor condenses into liquid water, the moisture content decreases, and during the constant-pressure heating process of air, the relative humidity of the air further decreases. Therefore, at this time, the moisture content of the air is extremely low, and it can become a very good drying gas, thereby improving the production capacity and economic benefits of the system.

[0022] A high-efficiency compressed air energy storage, release, and drying system with photoelectric complementarity is divided into four main component modules: an energy storage module, an energy release module, a photovoltaic and solar thermal collection and application module, and a drying module; the energy storage module includes a multi-stage compressor 3 and a second heat exchanger 8 connected in series alternately, and the second heat exchanger 8 at the last stage is connected to a gas storage tank 16 through a second valve 18; the gas storage tank 16 is connected to an energy release module for energy release; the energy release module is connected to the drying module; a photovoltaic and solar thermal collection and application module is also included.

[0023] Furthermore, the compressor 3 of the energy storage module includes an n-stage compressor, namely, a first-stage compressor 3.I, a second-stage compressor 3.II,..., an n-stage compressor 3.n; the second heat exchanger 8 includes an n-stage second heat exchanger, namely, a first-stage second heat exchanger 8.I, a second-stage second heat exchanger 8.II,..., an n-stage second heat exchanger 8.n; the air inlet of the first-stage compressor 3.I is connected to air, and the outlet is connected to the high-temperature side inlet pipeline of the first-stage second heat exchanger 8.I. The high-temperature side outlet pipeline of the first-stage second heat exchanger 8.I is connected to the next-stage second-stage compressor 3.II for further compression. The compressed air enters the second-stage second heat exchanger 8.II. The multi-stage compressor and heat exchanger are connected in this form. The high-temperature and high-pressure air coming out of the last n-stage compressor 3.n is connected to the high-temperature side inlet of the n-stage second heat exchanger 8.n. The low-temperature and high-pressure air at the high-temperature side outlet of the last n-stage second heat exchanger 8.n enters the gas storage tank 16 after passing through the second valve 18, and the gas storage tank is connected to the bottom of the lake.

[0024] Among them, in the energy storage module, when the energy storage loop is operating, the seventh valve 5.III and the eighth valve 5.IV in the energy storage loop are opened and are connected in series with the second circulation pump 7.II. The circulating working medium, low-temperature heat-conducting oil, flows out of the high-temperature phase change energy storage device under the action of the second circulation pump 7.II and respectively flows into the low-temperature side inlets of the first-stage second heat exchanger 8.I, the second-stage second heat exchanger 8.II,..., the n-stage second heat exchanger 8.n. After absorbing heat and increasing in temperature in the first-stage second heat exchanger 8.I, the second-stage second heat exchanger 8.II,..., the n-stage second heat exchanger 8.n, it respectively flows out from the low-temperature side outlets of the first-stage second heat exchanger 8.I, the second-stage second heat exchanger 8.II,..., the n-stage second heat exchanger 8.n. The high-temperature heat-conducting oil flowing out converges and then returns to the high-temperature phase change energy storage device to store the heat, completing one heat storage cycle.

[0025] Among them, during the operation process, the second valve 18 is opened. The high-temperature side inlet pipeline of the first-stage second heat exchanger 8.I is connected to the compressor. The raw air enters the first-stage compressor 3.I from the inlet pipeline of the first-stage compressor 3.I. The compressed air is connected to the high-temperature side inlet pipeline of the first-stage second heat exchanger 8.I, releases heat, and after cooling, enters the second-stage compressor 3.II again from the high-temperature side outlet pipeline. The air compressed through 2 stages enters the high-temperature side inlet pipeline of the second-stage second heat exchanger 8.II to release heat again. Similarly, the air is compressed 3 times, 4 times until n times in sequence, and the compression process is the same as the first and second compression processes, and the heat exchange process is also the same as the first and second heat exchange processes. The air compressed after the nth compression has reached a very high pressure. The air coming out of the last-stage compressor passes through the high-temperature side inlet pipeline of the n-stage second heat exchanger 8.n and then enters the underground gas storage tank 16 buried deep in the ground through the high-temperature side outlet pipeline of the heat exchanger. And this gas storage tank is connected to the bottom of the lake to ensure that the pressure of the high-pressure air remains constant. In the compressed air, due to the increase in pressure, the air will condense and the moisture content will decrease.

[0026] Furthermore, the exothermic module includes a fifth heat exchanger 20. The low-temperature side inlet pipeline of the fifth heat exchanger 20 is connected to the gas storage tank 16 through the third valve 19. The low-temperature side outlet of the fifth heat exchanger 20 is connected to the low-temperature side inlet pipeline of the fourth heat exchanger 17. The low-temperature side outlet of the fourth heat exchanger 17 is alternately connected in series with multiple stages of expanders 1 and the first heat exchanger 4 in sequence; each stage of expander 1 is correspondingly equipped with a stage of generator 2; the last-stage expander 1 is connected to the drying module. The expander 1 includes a first-stage expander 1.I, a second-stage expander 1.II,..., an n-stage expander 1.n, a total of n stages; the generator 2 includes a first-stage generator 2.I, a second-stage generator 2.II,..., an n-stage generator 2.n, a total of n stages; the first heat exchanger 4 includes a first-stage first heat exchanger 4.I, a second-stage first heat exchanger 4.II,..., an n-stage first heat exchanger 4.n, a total of n stages.

[0027] Furthermore, the outlet pipeline on the low-temperature side of the fourth heat exchanger 17 is connected to the first-stage expander 1.I, and a first-stage generator 2.I is provided in support of the first-stage expander 1.I to perform expansion power generation of high-pressure air. The outlet of the first-stage expander 1.I is connected to the inlet on the low-temperature side of the first first-stage heat exchanger 4.I. The outlet on the low-temperature side of the first first-stage heat exchanger 4.I is connected to the inlet of the second-stage expander 1.II. The high-pressure air after primary expansion and pressure reduction is heated in the first first-stage heat exchanger 4.I and then enters the second-stage expander 1.II again for secondary expansion power generation. The high-pressure air after secondary expansion power generation is connected to the pipeline at the inlet on the low-temperature side of the second first-stage heat exchanger 4.II. The multi-stage expanders and heat exchangers are connected in this form. The air leaving the last n-stage expander 1.n becomes low-temperature and low-pressure air and is then connected to the drying module circuit.

[0028] Among them, in the energy release module, when the energy release loop is operating, the first valve 5.I and the sixth valve 5.II in the energy release loop are opened and are connected in series with the first circulation pump 7.I. The high-temperature heat transfer oil flows from the high-temperature phase change energy storage device 6 into the inlets on the high-temperature sides of the respective first heat exchangers 4 and the inlet pipeline on the high-temperature side of the fourth heat exchanger 17. The first heat exchanger 4 and the fourth heat exchanger 17 are connected in parallel. The low-temperature heat transfer oil flowing out from the outlets on the high-temperature sides of the first heat exchanger 4 and the fourth heat exchanger 17 converges, and finally flows into the high-temperature phase change energy storage device 6 again for heating after passing through the sixth valve 5.II to complete a primary heat release cycle.

[0029] During operation, the third valve 19 is opened. The air coming out of the gas storage tank has a large pressure and a low moisture content. This high-pressure air is first preheated by the fifth heat exchanger 20, then heated by the fourth heat exchanger 17, and then can enter the first-stage expander 1.I. The first-stage expander 1.I is equipped with a first-stage generator 2.I to perform expansion power generation of high-pressure air. The heat source of the fifth heat exchanger 20 comes from the focused high-temperature solar thermal collector 22, and the heat source of the fourth heat exchanger 17 comes from the pipeline connected to the high-temperature phase change energy storage device. After the first expansion, the pressure and temperature of the air decrease, but its moisture content is still very low. The high-pressure air is connected to the low-temperature side inlet pipeline of the first heat exchanger 4.I of the first stage to absorb heat. Assuming that constant-pressure heating can be achieved, during this process, the moisture content remains unchanged, but the relative humidity decreases because of the expansion and heating processes, the pressure decreases and the temperature increases, and the relative humidity decreases. Then, the low-temperature side outlet pipeline of the first heat exchanger 4.I of the first stage is connected to the second-stage generator 2.II. The high-pressure air after the first expansion and pressure reduction is heated in the first heat exchanger 4.I of the first stage and then enters the second-stage generator 2.II again for secondary expansion power generation. The high-pressure air after 2 times of expansion power generation is then connected to the low-temperature side inlet pipeline of the second heat exchanger 4.II of the second stage. Similarly, the high-pressure air undergoes 3 times, 4 times until n times of expansion power generation in sequence, and the expansion process is the same as the first and second times, and the heat exchange process is also the same as the first and second heat exchange processes. The relative humidity of the air after n times of expansion reaches a very low value and then is connected to the drying module circuit.

[0030] Furthermore, the photovoltaic and solar thermal collection application module includes a photovoltaic conversion device 25. After the photovoltaic conversion device 25, a battery pack 26 is connected. The battery pack 26 is connected to the first circulation pump 7.I, the second circulation pump 7.II, the third circulation pump 23, the compressor 3, and the compressor 10 through wires and provides driving electric energy for them during the operation of the system. The photovoltaic and solar thermal collection application module also includes a focused high-temperature solar thermal collector 22. The heat medium outlet of the focused high-temperature solar thermal collector 22 is respectively connected to the high-temperature side inlet of the fifth heat exchanger 20 and the inlet of the high-temperature phase change energy storage device 6; the high-temperature side outlet of the fifth heat exchanger 20 is connected to the inlet of the third circulation pump 23 after passing through the fourth valve 21; the outlet of the high-temperature phase change energy storage device 6 is connected to the inlet of the third circulation pump 23 after passing through the fifth valve 24, and the outlet of the third circulation pump is connected to the heat medium inlet of the focused high-temperature solar thermal collector.

[0031] Among them, in the photovoltaic-thermal collection application module, during the specific operation process, during the day, when the energy release module is in the operation stage, the fourth valve 21 is opened and the fifth valve 24 is closed. The third circulation pump 23, the focused high-temperature photovoltaic-thermal collector 22, and the fifth heat exchanger 20 form a series connection. Under the forced pushing action of the third circulation pump 23, the circulating working medium, thermal oil, absorbs heat through the focused high-temperature photovoltaic-thermal collector 22, and after a significant temperature increase, it flows into the fifth heat exchanger 20, where it preheats the compressed air leaving the gas storage tank 16. After releasing heat and cooling down, the thermal oil returns to the focused high-temperature photovoltaic-thermal collector to absorb heat and increase the temperature again, and then enters the next preheating cycle of the compressed air. Through the above operation mode, the preheating of the compressed air before the expansion work of the solar thermal energy can be realized, and the energy conversion efficiency of its expansion process can be improved. When the compressed air energy release module is not working, the fourth valve 21 is closed and the fifth valve 24 is opened. The third circulation pump 23, the focused high-temperature photovoltaic-thermal collector 22, and the high-temperature phase change energy storage device 6 form a series connection. Under the forced pushing action of the third circulation pump 23, the circulating working medium, thermal oil, absorbs heat through the focused high-temperature photovoltaic-thermal collector 22 and significantly increases the temperature, and then flows into the high-temperature phase change energy storage device 6. In the high-temperature phase change energy storage device 6, the thermal oil releases heat and cools down, storing the thermal energy in the phase change material. After that, the low-temperature thermal oil leaving the high-temperature phase change energy storage device 6 returns to the focused high-temperature photovoltaic-thermal collector 22 to absorb heat and increase the temperature again to complete a heat storage cycle and enter the next cycle.

[0032] The components in the system that require electrical energy to drive, the first circulation pump 7.I, the second circulation pump 7.II, the third circulation pump 23, the compressor 3, and the compressor 10 are first connected together and then connected in series with the photovoltaic conversion device 25 and the battery pack 26. An AC-DC converter is placed inside the battery to output a continuous and stable current, so as to meet the self-running conditions of the system without the need to input energy from the outside. The focused high-temperature photovoltaic-thermal collector 22 converts solar energy into thermal energy by concentrating it. The focused high-temperature photovoltaic-thermal collector 22 can either be connected to the fifth heat exchanger 20 to preheat the high-pressure air coming out of the gas storage tank or be connected to the high-temperature phase change energy storage device 6 to transfer the thermal energy to the high-temperature phase change energy storage device 6 and store the heat to improve the energy utilization rate.

[0033] Further, the drying module includes a dual-effect heat pump circuit and a drying circulation circuit; the dual-effect heat pump circuit is composed of a compressor 10, a condenser 9, an expansion valve 11, and an evaporator 12 connected in series; the drying circulation circuit is as follows: the air outlet of the n-stage expander 1.n of the last stage is connected to the low-temperature side inlet of the condenser 9, the low-temperature side outlet of the condenser 9 is connected to the inlet of the high-temperature drying area 14, the outlet of the high-temperature drying area 14 is connected to the high-temperature side inlet of the third heat exchanger 13, the high-temperature side outlet of the third heat exchanger 13 is connected to the high-temperature side inlet of the evaporator 12, the high-temperature side outlet of the evaporator 12 is connected to the low-temperature side inlet of the third heat exchanger 13, the low-temperature side outlet of the third heat exchanger 13 is connected to the inlet of the low-temperature drying area 15, and the outlet of the low-temperature drying area 15 is directly communicated with the ambient air.

[0034] Among them, the working process of the drying module is as follows: the low-pressure and low-humidity air leaving the n-stage expander 1.n of the last stage first enters the low-temperature side inlet of the condenser 9, is heated in the condenser 9, and the relative humidity drops rapidly to become high-temperature air with extremely low relative humidity. Then it flows out from the low-temperature side outlet of the condenser 9. After that, the high-temperature air with extremely low relative humidity enters the high-temperature drying area 14 to perform high-temperature drying on the product to be dried. Subsequently, the high-temperature saturated wet air leaving the high-temperature drying area 14 enters the high-temperature side inlet of the third heat exchanger 13, is condensed, cooled, and dehumidified in the third heat exchanger 13. Then, the medium-temperature saturated wet air after cooling and dehumidification enters the high-temperature side of the evaporator 12 for deep cooling and dehumidification to become low-temperature saturated wet air. At this time, the absolute moisture content is greatly reduced. After that, the low-temperature saturated wet air leaves the evaporator 12 and enters the low-temperature side of the third heat exchanger 13 for heating. The increase in temperature causes the relative humidity to drop rapidly to become low-temperature air with low relative humidity. Then it enters the low-temperature drying area 15 to perform low-temperature drying and dehumidification on the product to be dried to become low-temperature saturated wet air. The low-temperature saturated wet air leaving the low-temperature drying area 15 is finally directly discharged into the atmosphere.

[0035] Further, the energy storage module further includes a seventh valve 5.III and an eighth valve 5.IV, and the seventh valve 5.III, the second circulation pump 7.II, the high-temperature phase change energy storage device 6, the eighth valve 5.IV, and the second heat exchanger 8 form a series circuit.

[0036] Further, the energy release module further includes a first valve 5.I and a sixth valve 5.II, and the first valve 5.I, the first circulation pump 7.I, the high-temperature phase change energy storage device 6, the sixth valve 5.II, the first heat exchanger 4, and the fourth heat exchanger 17 form a series circuit.

[0037] It also includes: a compressed air energy release module. The inlet side of the gas storage tank 16 is connected to the high-pressure air coming out of the last-stage heat exchanger in the energy storage module loop, and the outlet side is connected to the low-temperature side of the fifth heat exchanger 20. Second valves 18 and third valves 19 are respectively arranged on the pipelines on both sides. The bottom of the gas storage tank 16 is connected to a specific depth at the bottom of the lake through a high-pressure connection pipeline to keep the output high-pressure air at a constant pressure.

[0038] Embodiment 2: Furthermore, during the compressed air energy storage process, the air is compressed and cooled in multiple stages. Finally, the air in the gas storage tank is saturated wet air at low temperature and high pressure. Compared with the high pressure in the gas storage tank 16, the saturated partial pressure of water vapor in the wet air depending on the temperature is extremely low, so its moisture content is extremely low. Subsequently, after heating and multi-stage expansion, the low-pressure medium-temperature wet air leaving the last-stage n-stage expander 1.n has an extremely low relative humidity. Then, this low-humidity medium-temperature wet air enters the condenser 9 to be heated up again, and the relative humidity further decreases, becoming low-humidity high-temperature wet air with extremely strong moisture absorption and dehumidification ability. Then, it enters the high-temperature drying area 14 to efficiently complete the high-temperature drying of the dried product. After high-temperature drying, the wet air becomes high-humidity saturated wet air. Then, it enters the third heat exchanger 13 for primary cooling to cool the wet air below the dew point temperature to generate condensed water. The wet air leaving the third heat exchanger 13 becomes medium-temperature saturated wet air. Then, it enters the evaporator 12 for deep cooling and dehumidification to become low-temperature saturated wet air. Next, the low-temperature saturated wet air enters the third heat exchanger 13 to absorb heat and increase the temperature, and the relative humidity drops rapidly, becoming low-humidity low-temperature air with relatively strong dehumidification ability. Finally, the low-humidity low-temperature air enters the low-temperature drying area 15 to perform low-temperature drying on the product to be dried and becomes low-temperature saturated wet air. The low-temperature saturated wet air leaving the low-temperature drying area 15 is finally directly discharged into the atmosphere.

[0039] Furthermore, the low-pressure medium-temperature wet air coming out of the last-stage expander enters the condenser 9 to absorb heat. The gas coming out of the high-temperature side outlet of the condenser 9 passes through the expansion valve 11 to expand, cool down, and reduce pressure, and then enters the evaporator 12 to absorb the heat of the air passing through the heat exchanger 13, causing the air to undergo secondary deep cooling. Then, it is compressed and heated up by the compressor 10 and then enters the condenser 9 to release heat to complete the cycle.

[0040] Furthermore, the seventh valve 5.III and the eighth valve 5.IV in the energy storage loop are opened. The circulating working medium, the heat-conducting oil, flows from the outlet side pipeline of the high-temperature phase change energy storage device into each heat exchanger 8 under the action of the second circulation pump 7.II. They are connected in parallel. The heat exchangers absorb the heat in the compressed air, and then the high-temperature heat-conducting oil flowing through multiple heat exchangers is gathered together through the low-temperature side outlet pipeline of the parallel n-stage heat exchangers and then flows to the high-temperature phase change energy storage device, thereby storing the heat in the high-temperature phase change energy storage device.

[0041] Further, the first valve 5.I and the sixth valve 5.II in the energy storage loop are opened. The high-temperature heat-conducting oil, under the action of the first circulation pump 7.I, flows through the pipeline on the outlet side of the high-temperature phase-change energy storage device and separately into the high-temperature side inlet pipelines of each stage of the first heat exchanger 4 and the high-temperature side inlet pipeline of the fourth heat exchanger 17, which are also connected in parallel. The fourth heat exchanger 17 transfers heat to the air coming out of the fifth heat exchanger 20, and the first heat exchanger 4 transfers heat to the air coming out of the expander 1, thereby improving the power generation efficiency of the generator. The low-temperature heat-conducting oil that has released heat after passing through multiple heat exchangers flows out from the high-temperature side outlet of the first heat exchanger 4 and the high-temperature side outlet of the fourth heat exchanger 17, converges together, and finally flows into the high-temperature phase-change energy storage device 6 after passing through the sixth valve 5.II, thereby transferring heat to the high-pressure air for expansion power generation.

[0042] Further, during the day, it is the peak electricity consumption period and solar energy is sufficient. The focusing high-temperature solar collector 22 continuously absorbs the heat in solar energy. If the energy release module is in the operating stage, the fourth valve 21 is opened and the fifth valve 24 is closed. The third circulation pump 23, the focusing high-temperature solar collector 22, and the fifth heat exchanger 20 form a series connection. Under the forced pushing action of the third circulation pump 23, the circulating working medium heat-conducting oil flows through the focusing high-temperature solar collector 22, absorbs heat and significantly increases in temperature, and then flows into the fifth heat exchanger 20, where it preheats the compressed air leaving the gas storage tank 16 to improve the efficiency of subsequent expansion power generation. Then the heat-conducting oil returns to the inlet side of the collector to form a cycle. Through continuous circulating flow, the system continuously heats the gas coming out of the gas storage tank. When the compressed air energy release module is not working, the fourth valve 21 is closed and the fifth valve 24 is opened. The third circulation pump 23, the focusing high-temperature solar collector 22, and the high-temperature phase-change energy storage device 6 form a series connection. Under the forced pushing action of the third circulation pump 23, the circulating working medium heat-conducting oil flows through the focusing high-temperature solar collector 22, absorbs heat and significantly increases in temperature, and then flows into the high-temperature phase-change energy storage device 6. In the phase-change energy storage device 6, the heat-conducting oil releases heat and decreases in temperature, storing the thermal energy in the phase-change material, without wasting heat, and at the same time improving the power generation efficiency. Then the heat-conducting oil returns to the inlet side of the collector to form a cycle.

[0043] Further, the gas storage tank is placed underground, and its bottom pipeline is connected to a specific depth of the lake bottom to ensure that the pressure in the compressed air storage tank remains constant at the set value, realizing the constant-pressure energy storage and release of compressed air.

[0044] Embodiment 3: On the other hand, the present invention provides an operation method for a photoelectric complementary high-efficiency compressed air energy storage, release, and drying system. The operation method is implemented by using the photoelectric complementary high-efficiency compressed air energy storage, release, and drying system, and includes: During the low electricity consumption period, the system mainly consumes the redundant electric energy of the power grid to achieve the energy storage function: The second valve 18 opens, and air enters the first-stage compressor 3.I. It consumes the excess electric energy from the power grid for compression. After compression, the temperature of the air rises. The heat is transferred to the high-temperature phase change energy storage device 6 through the first second heat exchanger 8.I of the first stage. Then it enters the second-stage compressor 3.II for compression, and then enters the second second heat exchanger 8.II of the second stage for heat transfer. Then, air compression is carried out in sequence for the 3rd stage, 4th stage until the nth stage. The process is the same as that of the first stage and the second stage. In this process, the seventh valve 5.III and the eighth valve 5.IV of the high-temperature phase change energy storage device 6 are opened. The circulating working medium, the heat-conducting oil, flows through the second heat exchangers 8 of each stage respectively under the action of the second circulation pump 7.II and then converges together to store the heat in the high-temperature phase change energy storage device 6. The high-pressure air after n-stage compression and heat exchange is stored in the gas storage tank 16. The gas storage tank 16 is connected to the bottom of the lake, and the output high-pressure gas is at a constant pressure; During the peak electricity consumption period, the system mainly realizes the energy release function. The third valve 19 opens, and the high-pressure air is released from the gas storage tank 16. After being preheated by the fifth heat exchanger 20 and heated by the fourth heat exchanger 17, the high-pressure air enters the first-stage expander 1.I through the pipeline to perform expansion work on the high-pressure air and drive the first-stage generator 2.I to generate electricity. Subsequently, the air absorbs the heat in the high-temperature phase change energy storage device 6 through the first first heat exchanger 4.I of the first stage to increase the air pressure, which is beneficial for the expansion power generation of the next stage. The high-pressure gas continues to enter the second-stage expander 1.II for secondary expansion and drives the second-stage generator 2.II to generate electricity. Then, expansion power generation is carried out in sequence for the 3rd stage, 4th stage until the nth stage, and the electricity generated at each stage is transported to the power grid for end-users to use. The process is the same as that of the first stage and the second stage. In this process, the first valve 5.I and the sixth valve 5.II of the high-temperature phase change energy storage device 6 are opened. The circulating working medium, the heat-conducting oil, flows through the first heat exchangers 4 of each stage and the fourth heat exchanger 17 respectively under the action of the first circulation pump 7.I, and then converges together and returns to the high-temperature phase change energy storage device 6 to transfer the heat from the high-temperature phase change energy storage device 6 to the high-pressure gas. The heat required for preheating the fifth heat exchanger 20 is provided by the concentrated high-temperature solar thermal collector 22. It converts solar energy into heat and then transfers it to the fifth heat exchanger 20. If electricity generation is not required at this time, the fifth valve 24 is opened to transfer the converted heat to the high-temperature phase change energy storage device 6; The electricity generated by all generators 2 is aggregated and transported to the power grid for power distribution; The gas coming out of the n-stage expander 1.n of the last stage becomes low-pressure and low-humidity air and enters the condenser 9 to absorb heat. It becomes low-humidity and high-temperature humid air with extremely strong moisture absorption and dehumidification ability in the condenser 9 and then enters the high-temperature drying area 14 for high-temperature drying and dehumidification to become high-temperature and high-humidity air. Then it enters the third heat exchanger 13 to release heat and cool down to achieve condensation and dehumidification. It then undergoes secondary deep cooling and condensation dehumidification on the high-temperature side of the evaporator 12. At this time, the moisture content is further reduced to become extremely low-temperature saturated humid air. Then it passes through the low-temperature side of the third heat exchanger 13, absorbs heat, the temperature rises, and the relative humidity drops sharply to become low-temperature and low-humidity air. At this time, the air can be used for low-temperature drying; In this system, the equipment that needs to be electrically driven is provided by the photovoltaic conversion device 25 and the battery pack 26 to meet the operating conditions of the system and make full use of solar energy.

Claims

1. An efficient compressed air energy storage, release and drying system with optoelectronic complementarity, characterized in that: It includes an energy storage module for energy storage. The energy storage module includes a compressor (3) and a second heat exchanger (8) connected in series alternately in multiple stages. The second heat exchanger (8) at the last stage is connected to a gas storage tank (16) through a second valve (18); The gas storage tank (16) is connected to an energy release module for releasing energy; The energy release module is connected to a drying module; It also includes a photovoltaic and solar thermal collection and application module.

2. The high-efficiency compressed air energy storage, release and drying system with optoelectronic complementarity according to claim 1, characterized in that: The compressor (3) includes a total of n stages, namely a first-stage compressor (3.I), a second-stage compressor (3.II),... an n-stage compressor (3.n); The second heat exchanger (8) includes a total of n stages, namely a first-stage second heat exchanger (8.I), a second-stage second heat exchanger (8.II),... an n-stage second heat exchanger (8.n); The inlet of the first-stage compressor (3.I) is connected to air, and the outlet is connected to the inlet pipeline of the high-temperature side of the first-stage second heat exchanger (8.I). The outlet pipeline of the high-temperature side of the first-stage second heat exchanger (8.I) is connected to the next-stage second-stage compressor (3.II) for re-compression. The compressed air enters the second-stage second heat exchanger (8.II). The multi-stage compressor and heat exchanger are connected in this form. The high-temperature and high-pressure air coming out of the last n-stage compressor (3.n) is connected to the inlet of the high-temperature side of the n-stage second heat exchanger (8.n). The low-temperature and high-pressure air at the outlet of the high-temperature side of the last n-stage second heat exchanger (8.n) enters the gas storage tank (16) after passing through the second valve (18). The gas storage tank (16) is connected to the bottom of the lake.

3. The high-efficiency compressed air energy storage and drying system with optoelectronic complementarity according to claim 1, characterized in that: The energy release module includes a fifth heat exchanger (20). The inlet pipeline of the low-temperature side of the fifth heat exchanger (20) is connected to the gas storage tank (16) through a third valve (19). The outlet of the low-temperature side of the fifth heat exchanger (20) is connected to the inlet pipeline of the low-temperature side of the fourth heat exchanger (17). The outlet of the low-temperature side of the fourth heat exchanger (17) is alternately connected in series with multiple stages of expanders (1) and a first heat exchanger (4); Each stage of expander (1) is correspondingly equipped with a stage of generator (2); The expander (1) at the last stage is connected to the drying module.

4. The high-efficiency compressed air energy storage, release and drying system with optoelectronic complementarity according to claim 3, characterized in that: The expander (1) includes a total of n stages, namely a first-stage expander (1.I), a second-stage expander (1.II),... an n-stage expander (1.n); The generator (2) includes a total of n stages, namely a first-stage generator (2.I), a second-stage generator (2.II),... an n-stage generator (2.n); The first heat exchanger (4) includes a total of n stages, namely a first-stage first heat exchanger (4.I), a second-stage first heat exchanger (4.II),... an n-stage first heat exchanger (4.n); The low-temperature side outlet pipeline of the fourth heat exchanger (17) is connected to the first-stage expander (1.I). The first-stage expander (1.I) is equipped with a first-stage generator (2.I) to expand and generate electricity from high-pressure air. The outlet of the first-stage expander (1.I) is connected to the low-temperature side inlet of the first first-stage heat exchanger (4.I). The low-temperature side outlet of the first first-stage heat exchanger (4.I) is connected to the inlet of the second-stage expander (1.II). The high-pressure air after the first-stage expansion and pressure reduction is heated in the first first-stage heat exchanger (4.I) and then enters the second-stage expander (1.II) again for the second-stage expansion and power generation. The high-pressure air after the second-stage expansion and power generation is then connected to the low-temperature side inlet pipeline of the second first-stage heat exchanger (4.II). The multi-stage expanders and heat exchangers are connected in this form. The air leaving the last n-stage expander (1.n) becomes low-temperature and low-pressure air and is then connected to the drying module circuit.

5. The high-efficiency compressed air energy storage, release and drying system with optoelectronic complementarity according to claim 4, characterized in that: The photovoltaic and solar-thermal collection application module includes a photovoltaic conversion device (25). A battery pack (26) is connected behind the photovoltaic conversion device (25). The battery pack (26) is connected to the first circulation pump (7.I), the second circulation pump (7.II), the third circulation pump (23), the compressor (3), and the compressor (10) through wires and provides driving electric energy for them during the operation of the system.

6. The high-efficiency compressed air energy storage, release and drying system with optoelectronic complementarity according to claim 5, characterized in that: The photovoltaic and solar-thermal collection application module further includes a focusing high-temperature solar-thermal collector (22). The heat medium outlet of the focusing high-temperature solar-thermal collector (22) is respectively communicated with the high-temperature side inlet of the fifth heat exchanger (20) and the inlet of the high-temperature phase change energy storage device (6); the high-temperature side outlet of the fifth heat exchanger (20) is communicated with the inlet of the third circulation pump (23) after passing through the fourth valve (21); the outlet of the high-temperature phase change energy storage device (6) is communicated with the inlet of the third circulation pump (23) after passing through the fifth valve (24). The outlet of the third circulation pump (23) is connected to the heat medium inlet of the focusing high-temperature solar-thermal collector (22).

7. The high-efficiency compressed air energy storage, release and drying system with optoelectronic complementarity according to claim 6, characterized in that: The drying module includes a cold and heat dual-effect heat pump circuit and a drying circulation circuit; The cold and heat dual-effect heat pump circuit is composed of a compressor (10), a condenser (9), an expansion valve (11), and an evaporator (12) connected in series. The drying circulation circuit is as follows: The air outlet from the last n-stage expander (1.n) is connected to the low-temperature side inlet of the condenser (9). The low-temperature side outlet of the condenser (9) is connected to the inlet of the high-temperature drying area (14). The outlet of the high-temperature drying area (14) is connected to the high-temperature side inlet of the third heat exchanger (13). The high-temperature side outlet of the third heat exchanger (13) is connected to the high-temperature side inlet of the evaporator (12). The high-temperature side outlet of the evaporator (12) is connected to the low-temperature side inlet of the third heat exchanger (13). The low-temperature side outlet of the third heat exchanger (13) is connected to the inlet of the low-temperature drying area (15). The outlet of the low-temperature drying area (15) is directly communicated with the ambient air.

8. The high-efficiency compressed air energy storage, release and drying system with optoelectronic complementarity according to claim 7, characterized in that: The energy storage module further includes a seventh valve (5.III) and an eighth valve (5.IV). The seventh valve (5.III), the second circulation pump (7.II), the high-temperature phase change energy storage device (6), the eighth valve (5.IV), and the second heat exchanger (8) form a series circuit.

9. The high-efficiency compressed air energy storage, release and drying system with optoelectronic complementarity according to claim 8, characterized in that: The exothermic module further includes a first valve (5.I) and a sixth valve (5.II). The first valve (5.I), the first circulation pump (7.I), the high-temperature phase change energy storage device (6), the sixth valve (5.II), the first heat exchanger (4), and the fourth heat exchanger (17) form a series loop.

10. A method for operating an efficient compressed air energy storage and drying system with photovoltaic and complementary power, characterized in that, The operation method is implemented by using the high-efficiency compressed air energy storage, release, and drying system with optoelectronic complementarity described in claim 9, and includes: During the low electricity consumption period, the system mainly consumes the redundant electric energy of the power grid to achieve the energy storage function: The second valve (18) is opened, and air enters the first-stage compressor (3.I) to be compressed by consuming the redundant electric energy of the power grid. After compression, the temperature of the air rises. The heat is transferred to the high-temperature phase change energy storage device (6) through the first-stage second heat exchanger (8.I). Then it enters the second-stage compressor (3.II) for compression, and then enters the second-stage second heat exchanger (8.II) for heat transfer. Then, the air is compressed successively at the 3rd, 4th, and up to the nth stage. The process is the same as that of the first stage and the second stage. During this process, the seventh valve (5.III) and the eighth valve (5.IV) of the high-temperature phase change energy storage device (6) are opened. The circulating working medium, thermal oil, flows through each stage of the second heat exchanger (8) respectively under the action of the second circulation pump (7.II) and then converges together to store the heat in the high-temperature phase change energy storage device (6). The high-pressure air after being compressed and heat-exchanged at the nth stage is stored in the gas storage tank (16). The gas storage tank (16) is connected to the bottom of the lake, and the output high-pressure gas is at a constant pressure; During the high electricity consumption period, the system mainly realizes the energy release function. The third valve (19) is opened to release the high-pressure air from the gas storage tank (16). After being preheated by the fifth heat exchanger (20) and heated by the fourth heat exchanger (17), the high-pressure air enters the first-stage expander (1.I) through the pipeline to perform expansion work of the high-pressure air and drive the first-stage generator (2.I) to generate electricity. Subsequently, the air absorbs the heat in the high-temperature phase change energy storage device (6) through the first-stage first heat exchanger (4.I) to increase the air pressure, which is beneficial for the expansion power generation of the next stage. The high-pressure gas continues to enter the second-stage expander (1.II) for secondary expansion and drive the second-stage generator (2.II) to generate electricity. Then, it successively performs expansion power generation at the 3rd, 4th, and up to the nth stage and transmits the electricity generated at each stage to the power grid for end-users to use. The process is the same as that of the first stage and the second stage. During this process, the first valve (5.I) and the sixth valve (5.II) of the high-temperature phase change energy storage device (6) are opened. The circulating working medium, thermal oil, flows through each stage of the first heat exchanger (4) and the fourth heat exchanger (17) respectively under the action of the first circulation pump (7.I), and then converges together and returns to the high-temperature phase change energy storage device (6) to transfer the heat from the high-temperature phase change energy storage device (6) to the high-pressure gas. The heat required for preheating the fifth heat exchanger (20) is provided by the focused high-temperature solar thermal collector (22), which converts solar energy into heat and then transfers it to the fifth heat exchanger (20). If power generation is not required at this time, the fifth valve (24) is opened to transfer the converted heat to the high-temperature phase change energy storage device (6); The electricity generated by all generators (2) is aggregated and transported to the power grid for power distribution. The gas coming out of the nth-stage expander (1.n) at the last stage becomes low-pressure and low-humidity air and enters the condenser (9) to absorb heat. In the condenser (9), it becomes low-humidity and high-temperature humid air with extremely strong moisture absorption and dehumidification ability and then enters the high-temperature drying area (14) for high-temperature drying and dehumidification to become high-temperature and high-humidity air. Then it enters the third heat exchanger (13) to release heat and cool down to achieve dehumidification by condensation and dew formation. Then it undergoes secondary deep cooling and condensation dehumidification on the high-temperature side of the evaporator (12). At this time, the moisture content is further reduced to become extremely low-temperature saturated humid air. Then it passes through the low-temperature side of the third heat exchanger (13), absorbs heat, the temperature rises, and the relative humidity drops sharply to become low-temperature and low-humidity air. At this time, the air can be used for low-temperature drying. In this system, the equipment that needs to be driven by electricity is provided by the photovoltaic conversion device (25) and the battery pack (26) to meet the operating conditions of the system and make full use of solar energy.

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