Photo-thermal water pumping and compressed air hybrid energy storage system and operation method

Abstract

The invention relates to a photo-thermal water pumping and compressed air hybrid energy storage system and an operation method, and belongs to the technical field of energy storage. Comprising a compressor, a water-turbine generator set, a heat absorption tower, a steam turbine, a first water pump, a third water pump, a fourth water pump, a first water tank, a water-gas co-containing tank, a second water tank, a third water tank, a first circulating water pipe and a second circulating water pipe, the water-gas co-containing tank, the water-turbine generator set and the first water tank are sequentially and circularly connected to form an energy release system, a first circulating water pipe is arranged in the heat absorption tower, a second circulating water pipe is arranged in the water-gas co-containing tank, and the second circulating water pipe, the second water tank, the third water pump, the first circulating water pipe, the steam turbine, the third water tank and the fourth water pump are sequentially and circularly connected to form a photo-thermal driving system. According to the method, pumped storage, compressed air energy storage and photo-thermal power generation technologies are combined, photovoltaic resources are fully utilized, and the method has a good application scene under the background that carbon reaches the peak and carbon is neutralized.

Description

Technical Field

[0001] The invention relates to a photothermal water pumping compressed air hybrid energy storage system and an operation method, belonging to the technical field of energy storage. Background Art

[0002] In recent years, global fossil energy has gradually decreased, and energy shortages and environmental pollution have become increasingly serious. The impact of climate change has prompted countries to accelerate their transformation and actively seek solutions for renewable energy. Against this background, renewable energy such as wind and solar energy has developed rapidly. However, there is significant uncertainty in the power generation characteristics of wind and solar energy, making it difficult to ensure stable power output. Therefore, the development of energy storage equipment has become an important way to improve the efficiency of renewable energy utilization and enhance the stability of the power grid.

[0003] With the advancement of science and technology and the growth of market demand, the installed capacity of technologies such as pumped storage, lithium-ion batteries and compressed air energy storage has developed rapidly. Pumped storage technology has the advantages of mature technology, good economy, high round-trip efficiency, and it has a regulation capacity twice its installed capacity, which can effectively absorb wind and solar energy. However, it has the problem of limited site selection. In order to improve this problem, the publication number is CN114754519B, and the name of the invention is a pumped compressed air energy storage system and method for storing energy and heat using geothermal wells. Its technical solution proposes a pumped compressed air hybrid energy storage system that can utilize geothermal energy; the publication number is CN116086226B, and the name of the invention is a water-gas heat exchange system and method for pumped compressed air energy storage and the publication number is CN107990772A, and the name of the invention is an energy storage and release device. Its technical solutions respectively propose a pumped compressed air hybrid energy storage system combined with phase change heat storage. However, it only utilizes pumped compressed air energy storage and does not utilize solar thermal power generation. The operating efficiency of the pumped compressed air hybrid energy storage system is affected during the power generation process.

[0004] Therefore, it is urgent to propose a solar thermal water pumping compressed air hybrid energy storage system and an operation method to solve the above technical problems. Summary of the invention

[0005] In order to solve the above problems, a solar thermal water pumping compressed air hybrid energy storage system and an operating method are provided. A brief overview of the invention is given below to provide a basic understanding of certain aspects of the invention. It should be understood that this overview is not an exhaustive overview of the invention. It is not intended to identify the key or important parts of the invention, nor is it intended to limit the scope of the invention.

[0006] The technical solution of the present invention:

[0007] A photothermal water-pumping compressed air hybrid energy storage system comprises a compressor, a hydro-turbine generator set, a heat absorption tower, a steam turbine, a first water pump, a third water pump, a fourth water pump, a first water tank, a water-gas co-container tank, a second water tank, a third water tank, a first circulating water pipe and a second circulating water pipe. The water-gas co-container tank is connected to the compressor to form a pressure regulating system, the water-gas co-container tank, the hydro-turbine generator set and the first water tank are connected in sequence to form an energy release system, a first circulating water pipe is provided in the heat absorption tower, a second circulating water pipe is provided in the water-gas co-container tank, the second circulating water pipe, the second water tank, the third water pump, the first circulating water pipe, the steam turbine, the third water tank and the fourth water pump are connected in sequence to form a driving system; the first water tank, the first water pump and the water-gas co-container tank are connected in sequence to form an electric driving system.

[0008] Preferably, the pressure regulating system further comprises a first electric valve, an air hole is arranged on the upper part of the water-gas co-containment tank, and the compressor is connected to the air hole of the water-gas co-containment tank through the first electric valve.

[0009] Preferably: the energy release system also includes a second accumulator, a tenth electric valve, an eleventh electric valve and a twelfth electric valve, the lower part of the water-gas co-containment tank is provided with an outlet and an inlet, and the outlet of the water-gas co-containment tank, the tenth electric valve, the hydro-turbine generator set, the eleventh electric valve, the second accumulator and the first water tank are connected in sequence.

[0010] Preferably: the photothermal drive system further comprises a sixth electric valve, a seventh electric valve, an eighth electric valve, a ninth electric valve, a thirteenth electric valve, a fourteenth electric valve and a fifteenth electric valve, and the outlet of the second circulating water pipe, the fifteenth electric valve, the second water tank, the sixth electric valve, the third water pump, the seventh electric valve, the first circulating water pipe, the eighth electric valve, the steam turbine, the ninth electric valve, the third water tank, the thirteenth electric valve, the fourth water pump, the fourteenth electric valve and the inlet of the second circulating water pipe are connected in sequence. The electric drive system further comprises a first accumulator, a second electric valve and a fourth electric valve; the inlet of the water-gas co-container tank, the fourth electric valve, the first accumulator and the first water pump are connected in sequence, the inlet and outlet of the first accumulator are provided with a second electric valve, and the inlet and outlet of the second accumulator are provided with a twelfth electric valve.

[0011] Preferably: the first circulating water pipe and the second circulating water pipe are both spiral pipes;

[0012] The first water tank has a lower inlet and a side outlet, the inlet of the first water tank is connected to the second accumulator, the outlet of the first water tank is connected to the first water pump, the second water tank has an upper inlet and a lower outlet, the inlet of the second water tank is connected to the fifteenth electric valve, the outlet of the second water tank is connected to the sixth electric valve, and the third water tank has a lower outlet and inlet.

[0013] Preferably: the photothermal drive system further comprises one or more reflective plates, and the reflective plates are arranged below the heat absorption tower.

[0014] Preferably: it also includes a second water pump, a third electric valve, a fifth electric valve and a spray device, the spray device is arranged in a water-gas co-containment tank, the spray device is located above the second circulating water pipe, the third electric valve, the second water pump, the fifth electric valve and the spray device are connected in sequence to form a cooling system, and the inlet end of the third electric valve is connected to the pipeline between the fourth electric valve and the first accumulator.

[0015] Preferably: it also includes a pressure sensor and a liquid level sensor, and the upper and lower parts of the water-gas co-containment tank are respectively provided with a pressure sensor and a liquid level sensor, the pressure sensor is located at the upper part of the water-gas co-containment tank, and the liquid level sensor is located at the lower part of the water-gas co-containment tank.

[0016] An operating method of a photothermal water pumping compressed air hybrid energy storage system, using the photothermal water pumping compressed air hybrid energy storage system, comprising the following steps:

[0017] Pressure prefabrication conditions;

[0018] Water pumping and energy storage working conditions;

[0019] CSP operating conditions;

[0020] Power generation conditions of hydro-generator sets;

[0021] The parallel power generation condition of solar thermal and hydropower generator sets.

[0022] Preferred: pressure prefabrication working condition: Under this working condition, the first electric valve is opened, the compressor is started, and compressed air is filled into the water-gas co-container tank until the pressure measured by the pressure sensor reaches the set lower limit pressure p1;

[0023] Water pump pumping and energy storage working condition: the second electric valve, the third electric valve, the fourth electric valve and the fifth electric valve are opened, and the other valves are closed; the first water pump draws water from the first water pool into the water-air co-container tank to compress the air for energy storage. When the air pressure measured by the pressure sensor in the tank reaches the set upper limit pressure p2, the water pump pumping and energy storage process ends; when storing energy, a small part of the water pumped by the first water pump is drawn by the second water pump into the spraying device for spraying; wherein, the upper limit pressure p2 is greater than the lower limit pressure p1, and the lower limit pressure p1 is greater than the atmospheric pressure;

[0024] Solar thermal power generation conditions: When the solar radiation conditions are abundant, the system operates in the solar thermal power generation conditions. The sixth electric valve, the seventh electric valve, the eighth electric valve and the ninth electric valve are opened, and the other valves are closed; the reflector reflects sunlight to the top of the heat absorption tower, heating the molten salt filled in the heat absorption tower, and the temperature of the molten salt increases; at the same time, the third water pump draws water from the second water pool into the first circulating water pipe placed on the top of the heat absorption tower; when the water flows through the first circulating water pipe, it absorbs the heat in the molten salt and changes into water vapor; the formed water vapor flows through the steam turbine to generate power, and the temperature drops, and it re-liquefies into water, and then is discharged into the third water pool for storage;

[0025] Hydro-turbine generator unit power generation condition: When the air pressure in the water-gas co-container tank is greater than the lower limit pressure p1, the system can operate in the hydro-turbine generator unit power generation condition; the tenth electric valve, the eleventh electric valve and the twelfth electric valve are opened, and the other valves are closed; the water at the bottom of the water-gas co-container tank flows out to the hydro-turbine generator unit to generate power;

[0026] The operating condition of CSP and hydro-turbine generator sets in parallel: when the solar radiation conditions are abundant, the system can operate in the operating condition of CSP and hydro-turbine generator sets in parallel; under this operating condition, the sixth electric valve, the seventh electric valve, the eighth electric valve, the ninth electric valve, the tenth electric valve, the eleventh electric valve, the twelfth electric valve, the thirteenth electric valve and the fourteenth electric valve are opened, and the other valves are closed; the water at the bottom of the water-gas co-containment tank flows out to the hydro-turbine generator set to generate power, and the water after power generation returns to the first water pool; as the water continues to flow out, the air in the water-gas co-containment tank expands and the air pressure decreases; when the air expands, it absorbs heat and the air temperature decreases;

[0027] At the same time, the reflector reflects sunlight to the heat absorption tower to heat the molten salt. The third water pump draws water from the second water pool to the heat absorption tower. After absorbing the heat in the molten salt, it is discharged to the steam turbine through the outlet of the first circulating water pipe to generate electricity. The water vapor after power generation is cooled into water and returned to the third water pool. The water returned to the third water pool still contains a certain amount of heat, and the water body is hot water.

[0028] Start the fourth water pump to pump the warm water in the third water pool into the second circulating water pipe in the water-gas co-containment tank to heat the air in the water-gas co-containment tank.

[0029] The present invention has the following beneficial effects:

[0030] This invention combines pumped storage, compressed air energy storage and solar thermal power generation technologies to achieve full utilization of photovoltaic resources and has good application scenarios in the context of carbon peak and carbon neutrality.

[0031] The present invention improves the problem of limited site selection for pumped storage and allows flexible site selection; it has multiple operating conditions and can better adapt to climate and power grid power consumption.

[0032] The present invention installs a spray device on the top of the water-gas co-containment tank in a diversion mode during water pumping, thereby improving the thermodynamic performance in the water-gas co-containment tank under the water pumping and energy storage working condition.

[0033] The present invention improves the thermodynamic performance of the tank under the condition of parallel power generation of solar thermal and hydro-turbine generator sets by introducing waste heat from solar thermal power generation into the water-gas co-containment tank.

[0034] The present invention does not rely on fossil fuels and is environmentally friendly; it is easy to construct in a modular manner and has a short construction period; and the system can operate safely, stably and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of a solar thermal water pumping compressed air hybrid energy storage system described in a specific embodiment of the present invention.

[0036] Figure 2 It is a schematic diagram of the operating method of the pressure prefabrication condition of a solar thermal water pumping compressed air hybrid energy storage system described in a specific embodiment of the present invention.

[0037] Figure 3 It is a schematic diagram of an operation method of a water pumping and energy storage condition of a photothermal water pumping and compressed air hybrid energy storage system described in a specific embodiment of the present invention.

[0038] Figure 4 It is a schematic diagram of an operating method for a solar thermal power generation condition of a solar thermal water pumping compressed air hybrid energy storage system described in a specific embodiment of the present invention.

[0039] Figure 5 It is a schematic diagram of the operating method of the power generation condition of a hydro-generator set of a solar thermal pumping compressed air hybrid energy storage system described in a specific embodiment of the present invention.

[0040] Figure 6 It is a schematic diagram of the operation method of the parallel power generation condition of the solar thermal and hydro-turbine generator sets in a solar thermal pumping compressed air hybrid energy storage system described in a specific embodiment of the present invention.

[0041] In the figure, 11-first water pump, 12-second water pump, 13-third water pump, 14-fourth water pump, 21-first water tank, 22-water-gas co-container tank, 23-second water tank, 24-third water tank, 3-accumulator, 401-first electric valve, 402-second electric valve, 403-third electric valve, 404-fourth electric valve, 405-fifth electric valve, 406-sixth electric valve, 407-seventh electric valve, 408-eighth electric valve, 409-ninth electric valve valve, 410-the tenth electric valve, 411-the eleventh electric valve, 412-the twelfth electric valve, 413-the thirteenth electric valve, 414-the fourteenth electric valve, 415-the fifteenth electric valve, 5-spraying equipment, 6-compressor, 7-hydraulic generator set, 8-heat absorption tower, 91-the first circulating water pipe, 92-the second circulating water pipe, 10-steam turbine, 111-the first reflector, 112-the second reflector, 121-pressure sensor, 122-liquid level sensor. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0043] Specific implementation method 1: Combination Figure 1 The present embodiment is described. A solar thermal pumping compressed air hybrid energy storage system of the present embodiment includes a compressor 6, a turbine generator set 7, a heat absorption tower 8, a steam turbine 10, a first water pump 11, a third water pump 13, a fourth water pump 14, a first water tank 21, a water-gas common containment tank 22, a second water tank 23, a third water tank 24, a first circulating water pipe 91 and a second circulating water pipe 92. The water-gas common containment tank 22 is connected to the compressor 6 to form a pressure regulating system. The water-gas common containment tank 22, the turbine generator set 7, the heat absorption tower 8, the steam turbine 10, the first water pump 11, the third water pump 13, the fourth water pump 14, the first water tank 21, the water-gas common containment tank 22, the second water tank 23, the third water tank 24, the first circulating water pipe 91 and the second circulating water pipe 92. The generator set 7 and the first water tank 21 are connected in sequence to form an energy release system. A first circulating water pipe 91 is provided in the heat absorption tower 8, and a second circulating water pipe 92 is provided in the water-gas co-containment tank 22. The second circulating water pipe 92, the second water tank 23, the third water pump 13, the first circulating water pipe 91, the steam turbine 10, the third water tank 24, and the fourth water pump 14 are connected in sequence to form a photothermal drive system; the first water tank 21, the first water pump 11, and the water-gas co-containment tank 22 are connected in sequence to form an electric drive system.

[0044] The pressure regulating system further includes a first electric valve 401. An air hole is provided on the upper portion of the water-gas co-containment tank 22. The outlet of the compressor 6 is connected to the air hole of the water-gas co-containment tank 22 through a pipeline via the first electric valve 401.

[0045] The energy release system further includes a second accumulator 32, a tenth electric valve 410, an eleventh electric valve 411 and a twelfth electric valve 412. The lower part of the water-gas co-containment tank 22 is provided with an outlet and an inlet. The outlet of the water-gas co-containment tank 22, the tenth electric valve 410, the hydro-generator set 7, the eleventh electric valve 411, the second accumulator 32 and the first water tank 21 are connected in sequence through pipelines.

[0046] The solar thermal drive system also includes a sixth electric valve 406, a seventh electric valve 407, an eighth electric valve 408, a ninth electric valve 409, a thirteenth electric valve 413, a fourteenth electric valve 414 and a fifteenth electric valve 415, an outlet of the second circulating water pipe 92, the fifteenth electric valve 415, the second water tank 23, the sixth electric valve 406, the third water pump 13, the seventh electric valve 407, the first circulating water pipe 91, the eighth electric valve 408, the steam turbine 10, the ninth electric valve 409, the third water tank 24 , a thirteenth electric valve 413, a fourth water pump 14, a fourteenth electric valve 414, and an inlet of the second circulating water pipe 92 are connected in sequence; the electric drive system also includes a first accumulator 31, a second electric valve 402, a fourth electric valve 404, an inlet of the water-gas co-container tank 22, the fourth electric valve 404, the first accumulator 31, and the first water pump 11 are connected in sequence through pipelines, the inlet and outlet of the first accumulator 31 are provided with a second electric valve 402, and the inlet and outlet of the second accumulator 32 are provided with a twelfth electric valve 412;

[0047] The first circulating water pipe 91 and the second circulating water pipe 92 are both spiral pipes;

[0048] The first water tank 21 has a lower inlet and a side outlet, the inlet of the first water tank 21 is connected to the second accumulator 32, the outlet of the first water tank 21 is connected to the first water pump 11, the second water tank 23 has an upper inlet and a lower outlet, the inlet of the second water tank 23 is connected to the fifteenth electric valve 415, the outlet of the second water tank 23 is connected to the sixth electric valve 406, and the third water tank 24 has a lower outlet and an inlet;

[0049] The photothermal drive system further includes one or more reflective plates, namely a first reflective plate 111 and a second reflective plate 112, which are arranged below the heat absorption tower 8;

[0050] It also includes a second water pump 12, a third electric valve 403, a fifth electric valve 405 and a spray device 5, wherein the spray device 5 is arranged at the top of the water-gas co-container tank 22, and the spray device 5 is located above the second circulating water pipe 92. The third electric valve 403, the second water pump 12, the fifth electric valve 405 and the spray device 5 are connected in sequence through pipelines to form a cooling system, and the inlet end of the third electric valve 403 is connected to the pipeline between the fourth electric valve 404 and the first accumulator 31 through a thin pipeline;

[0051] It also includes a pressure sensor 121 and a liquid level sensor 122. The upper and lower parts of the inner side wall of the water-gas co-containment tank 22 are respectively provided with the pressure sensor 121 and the liquid level sensor 122. The pressure sensor 121 is located at the upper part of the water-gas co-containment tank 22, and the liquid level sensor 122 is located at the lower part of the water-gas co-containment tank 22.

[0052] The present invention further combines the solar thermal power generation technology with the pumped compressed air energy storage technology, making full use of the waste heat generated by the solar thermal power generation device, improving the operating efficiency of the pumped compressed air hybrid energy storage system during the power generation process, and expanding the application scenarios of the pumped compressed air hybrid energy storage technology. The structural design is reasonable and easy to repair and maintain.

[0053] Specific implementation method 2: Combination Figure 2-6 The present embodiment is described. The operation method of a photothermal water pumping compressed air hybrid energy storage system of the present embodiment adopts the photothermal water pumping compressed air hybrid energy storage system (hereinafter referred to as the system). The first water pump 11 includes a water inlet and a water outlet. The water inlet is connected to the first water tank 21, and the water outlet is connected to the first accumulator 31 and then bifurcated. One of the bifurcated pipes is connected to the spray device 5 at the top of the water-gas co-containment tank 22 via the pipeline where the second water pump 12 is located. The diameter of this bifurcated pipe is small, and only a small amount of water flow is used for spray cooling; the other bifurcated pipe is connected to the water inlet at the bottom of the water-gas co-containment tank 22;

[0054] Another inlet at the top of the water-gas co-containment tank 22 is connected to the compressor 6 through a pipeline; the compressor 6 can fill the water-gas co-containment tank 22 with compressed air;

[0055] The hydro-generator set 7 includes a water inlet and a water outlet. The water inlet is connected to the water outlet at the bottom of the water-gas co-container 22, and the water outlet is connected to the second accumulator 32 and then to the first water tank 21.

[0056] The third water pump 13 includes a water inlet and a water outlet. The water inlet is connected to the bottom of the second water pool 23, and the water outlet is connected to the water inlet of the first circulating water pipe 91 spiraling in the heat absorption tower 8.

[0057] The steam turbine 10 includes an inlet and an outlet. The inlet is connected to the outlet of the first circulating water pipe 91 in the heat absorption tower 8. The outlet of the steam turbine 10 is connected to the water inlet at the bottom of the third water pool 24.

[0058] The fourth water pump 14 includes a water inlet and a water outlet. The water inlet is connected to the water outlet at the bottom of the third water pool 24, and the water outlet is connected to the water inlet of the second circulating water pipe 92 spiraling in the water-gas co-container tank 22.

[0059] The first reflector 111 and the second reflector 112 below the heat absorption tower 8 can reflect sunlight to the top of the heat absorption tower 8. The heat absorption tower 8 is filled with molten salt, which can fully absorb the heat carried by the sunlight reflected by the reflector. A first circulating water pipe 91 is spiraled inside the heat absorption tower 8;

[0060] A pressure sensor 121 is installed on the upper part of one side of the water-gas co-containment tank 22, and a liquid level sensor 122 is installed on the lower part; a second circulating water pipe 92 is installed in the water-gas co-containment tank 22;

[0061] The method comprises the following steps:

[0062] Pressure prefabrication condition: Under this condition, the first electric valve 401 is opened, the compressor 6 is started, and compressed air is filled into the water-gas co-container tank 22 until the pressure measured by the pressure sensor 121 reaches the set lower limit pressure p1;

[0063] Water pump pumping and energy storage working condition: the second electric valve 402, the third electric valve 403, the fourth electric valve 404 and the fifth electric valve 405 are opened, and the other valves are closed; the first water pump 11 draws the water in the first water pool 21 into the water-gas co-container tank 22 to compress the air for energy storage. When the air pressure measured by the pressure sensor 121 in the tank reaches the set upper limit pressure p2, the water pump pumping and energy storage process ends; the first accumulator 31 can be used to reduce the water hammer pressure caused by the opening and closing of the valve or the change of the working condition; when storing energy, a small part of the water pumped by the first water pump 11 is drawn by the second water pump 12 into the spray device 5 for spraying to reduce the temperature rise during the air compression process; wherein, the upper limit pressure p2 is greater than the lower limit pressure p1, and the lower limit pressure p1 is greater than the atmospheric pressure;

[0064] Solar thermal power generation conditions: When the solar radiation conditions are abundant, the system operates in the solar thermal power generation conditions. The sixth electric valve 406, the seventh electric valve 407, the eighth electric valve 408 and the ninth electric valve 409 are opened, and the other valves are closed; the first reflector 111 and the second reflector 112 reflect sunlight to the top of the heat absorption tower 8, heating the molten salt filled in the heat absorption tower 8, and the temperature of the molten salt increases; at the same time, the third water pump 13 draws water from the second water tank 23 into the first circulating water pipe 91 placed on the top of the heat absorption tower 8; when the water flows through the first circulating water pipe 91, it absorbs the heat in the molten salt and changes into water vapor; the formed water vapor flows through the steam turbine 10 to generate power, and the temperature decreases, and it is re-liquefied into water, and then discharged into the third water tank 24 for storage;

[0065] Hydro-turbine generator set power generation: When the air pressure of the water-gas co-containment tank 22 is greater than the lower limit pressure p1, the system can operate in the hydro-turbine generator set power generation condition; the tenth electric valve 410, the eleventh electric valve 411 and the twelfth electric valve 412 are opened, and the other valves are closed; the water at the bottom of the water-gas co-containment tank 22 flows out to the hydro-turbine generator set 7 to generate power; the second accumulator 32 can be used to reduce the water hammer pressure caused by the opening and closing of the guide vanes and the valve opening and closing of the hydro-turbine generator set;

[0066] Solar thermal and hydro-turbine generator sets generate electricity in parallel: When the solar radiation conditions are abundant, the system can operate in the solar thermal and hydro-turbine generator sets generate electricity in parallel; under this condition, the sixth electric valve 406, the seventh electric valve 407, the eighth electric valve 408, the ninth electric valve 409, the tenth electric valve 410, the eleventh electric valve 411, the twelfth electric valve 412, the thirteenth electric valve 413 and the fourteenth electric valve 414 are opened, and the other valves are closed; the water at the bottom of the water-gas co-containment tank 22 flows out to the hydro-turbine generator set 7 to generate electricity, and the water after power generation returns to the first water pool 21; as the water continues to flow out, the air in the water-gas co-containment tank 22 expands and the air pressure decreases; the air absorbs heat when it expands, and the air temperature decreases;

[0067] At the same time, the first reflector 111 and the second reflector 112 reflect sunlight to the heat absorption tower 8 to heat the molten salt. The third water pump 13 draws water from the second water pool 23 to the heat absorption tower 8. After absorbing the heat in the molten salt, the water is discharged to the steam turbine 10 through the outlet of the first circulating water pipe 91 to generate electricity. The water vapor after power generation is cooled into water and returned to the third water pool 24. The water returned to the third water pool 24 still contains a certain amount of heat, and the water is hot water.

[0068] Start the fourth water pump 14 to pump the warm water in the third water pool 24 into the second circulating water pipe 92 in the water-gas co-containment tank 22, thereby heating the air in the water-gas co-containment tank 22, making full use of the surplus heat of solar thermal power generation and improving the round-trip efficiency of the entire system.

[0069] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A solar thermal water pumping compressed air hybrid energy storage system, characterized by: The invention comprises a compressor (6), a hydro-turbine generator set (7), a heat absorption tower (8), a steam turbine (10), a first water pump (11), a third water pump (13), a fourth water pump (14), a first water tank (21), a water-gas common containment tank (22), a second water tank (23), a third water tank (24), a first circulating water pipe (91) and a second circulating water pipe (92), wherein the water-gas common containment tank (22) is connected to the compressor (6) to form a pressure regulating system, and the water-gas common containment tank (22), the hydro-turbine generator set (7), the first water tank (21) They are connected in sequence to form an energy release system. A first circulating water pipe (91) is provided in the heat absorption tower (8), a second circulating water pipe (92) is provided in the water-gas co-containment tank (22), the second circulating water pipe (92), the second water tank (23), the third water pump (13), the first circulating water pipe (91), the steam turbine (10), the third water tank (24), and the fourth water pump (14) are connected in sequence to form a photothermal drive system; the first water tank (21), the first water pump (11), and the water-gas co-containment tank (22) are connected in sequence to form an electric drive system.

2. A solar thermal water pumping compressed air hybrid energy storage system according to claim 1, characterized in that: The pressure regulating system further comprises a first electric valve (401), an air hole is arranged on the upper part of the water-gas co-containment tank (22), and the compressor (6) is connected to the air hole of the water-gas co-containment tank (22) through the first electric valve (401).

3. A solar thermal water pumping compressed air hybrid energy storage system according to claim 2, characterized in that: The energy release system further comprises a second accumulator (32), a tenth electric valve (410), an eleventh electric valve (411) and a twelfth electric valve (412); an outlet and an inlet are arranged at the lower part of the water-gas co-containment tank (22); the outlet of the water-gas co-containment tank (22), the tenth electric valve (410), the hydro-generator set (7), the eleventh electric valve (411), the second accumulator (32) and the first water tank (21) are connected in sequence.

4. The solar thermal water pumping compressed air hybrid energy storage system according to claim 3 is characterized by: The solar thermal drive system also includes a sixth electric valve (406), a seventh electric valve (407), an eighth electric valve (408), a ninth electric valve (409), a thirteenth electric valve (413), a fourteenth electric valve (414) and a fifteenth electric valve (415), an outlet of the second circulating water pipe (92), the fifteenth electric valve (415), the second water tank (23), the sixth electric valve (406), the third water pump (13), the seventh electric valve (407), the first circulating water pipe (91), the eighth electric valve (408), the steam turbine (10), the ninth electric valve (409 ... The electric drive system further comprises a first accumulator (31), a second electric valve (402), a fourth electric valve (404), an inlet of the water-gas co-container tank (22), the fourth electric valve (404), the first accumulator (31), and the first water pump (11) which are connected in sequence; the inlet and outlet of the first accumulator (31) are provided with the second electric valve (402), and the inlet and outlet of the second accumulator (32) are provided with the twelfth electric valve (412).

5. The solar thermal water pumping compressed air hybrid energy storage system according to claim 4 is characterized by: The first circulating water pipe (91) and the second circulating water pipe (92) are both spiral pipes; The first water tank (21) has a lower inlet and a side outlet, the inlet of the first water tank (21) is connected to the second accumulator (32), the outlet of the first water tank (21) is connected to the first water pump (11), the second water tank (23) has an upper inlet and a lower outlet, the inlet of the second water tank (23) is connected to the fifteenth electric valve (415), the outlet of the second water tank (23) is connected to the sixth electric valve (406), and the third water tank (24) has a lower outlet and an inlet.

6. The solar thermal water pumping compressed air hybrid energy storage system according to claim 4 is characterized by: The photothermal drive system also includes one or more reflective plates, which are arranged below the heat absorption tower (8).

7. The solar thermal water pumping compressed air hybrid energy storage system according to claim 6 is characterized by: The system further comprises a second water pump (12), a third electric valve (403), a fifth electric valve (405) and a spray device (5), wherein the spray device (5) is arranged in a water-gas co-containment tank (22), the spray device (5) is located above a second circulating water pipe (92), the third electric valve (403), the second water pump (12), the fifth electric valve (405) and the spray device (5) are connected in sequence to form a cooling system, and the inlet end of the third electric valve (403) is connected to a pipeline between a fourth electric valve (404) and a first accumulator (31).

8. The solar thermal water pumping compressed air hybrid energy storage system according to claim 7 is characterized by: The invention also comprises a pressure sensor (121) and a liquid level sensor (122); the upper part and the lower part of the water-gas co-containment tank (22) are respectively provided with the pressure sensor (121) and the liquid level sensor (122); the pressure sensor (121) is located at the upper part of the water-gas co-containment tank (22), and the liquid level sensor (122) is located at the lower part of the water-gas co-containment tank (22).

9. An operating method of a solar thermal water pumping compressed air hybrid energy storage system, characterized in that: A solar thermal water pumping compressed air hybrid energy storage system according to any one of claims 1 to 8 is used, comprising the following steps: Pressure prefabrication conditions; Water pumping and energy storage working conditions; CSP operating conditions; Power generation conditions of hydro-generator sets; The parallel power generation condition of solar thermal and hydropower generator sets.

10. The method for operating a solar thermal water pumping compressed air hybrid energy storage system according to claim 8, characterized in that: Pressure prefabrication condition: Under this condition, the first electric valve (401) is opened, the compressor (6) is started, and compressed air is filled into the water-gas co-container tank (22) until the pressure measured by the pressure sensor (121) reaches the set lower limit pressure p1; Water pump pumping and energy storage working condition: the second electric valve (402), the third electric valve (403), the fourth electric valve (404) and the fifth electric valve (405) are opened, and the other valves are closed; the first water pump (11) draws water from the first water pool (21) into the water-air co-container tank (22) to compress the air for energy storage, and when the air pressure measured by the pressure sensor (121) in the tank reaches the set upper limit pressure p2, the water pump pumping and energy storage process ends; when energy is stored, a small portion of the water pumped by the first water pump (11) is drawn by the second water pump (12) into the spray device (5) for spraying; wherein the upper limit pressure p2 is greater than the lower limit pressure p1, and the lower limit pressure p1 is greater than the atmospheric pressure. Solar thermal power generation conditions: When the solar radiation conditions are abundant, the system operates in the solar thermal power generation conditions. The sixth electric valve (406), the seventh electric valve (407), the eighth electric valve (408) and the ninth electric valve (409) are opened, and the other valves are closed; the reflector reflects sunlight to the top of the heat absorption tower (8), heating the molten salt filled in the heat absorption tower (8), and the temperature of the molten salt increases; at the same time, the third water pump (13) draws water from the second water pool (23) into the first circulating water pipe (91) placed on the top of the heat absorption tower (8); when the water flows through the first circulating water pipe (91), it absorbs the heat in the molten salt and changes into water vapor; the formed water vapor flows through the steam turbine (10) to generate power, and the temperature decreases, and it is re-liquefied into water, and then discharged into the third water pool (24) for storage; Hydro-turbine generator set power generation: when the air pressure in the water-gas co-containment tank (22) is greater than the lower limit pressure p1, the system can operate in the hydro-turbine generator set power generation condition; the tenth electric valve (410), the eleventh electric valve (411) and the twelfth electric valve (412) are opened, and the other valves are closed; the water at the bottom of the water-gas co-containment tank (22) flows out to the hydro-turbine generator set (7) to generate power; Solar thermal and hydroelectric generator sets generate electricity in parallel: When the solar radiation conditions are abundant, the system can operate in the solar thermal and hydroelectric generator sets generate electricity in parallel; under this condition, the sixth electric valve (406), the seventh electric valve (407), the eighth electric valve (408), the ninth electric valve (409), the tenth electric valve (410), the eleventh electric valve (411), the twelfth electric valve (412), the thirteenth electric valve (413) and the fourteenth electric valve (414) are opened, and the other valves are closed; the water at the bottom of the water-gas co-containment tank (22) flows out to the hydroelectric generator set (7) to generate electricity, and the water after power generation returns to the first water pool (21); as the water continues to flow out, the air in the water-gas co-containment tank (22) expands, and the air pressure decreases; when the air expands, it absorbs heat, and the air temperature decreases; At the same time, the reflector reflects sunlight to the heat absorption tower (8) to heat the molten salt. The third water pump (13) draws water from the second water pool (23) to the heat absorption tower (8). After absorbing the heat in the molten salt, the water is discharged to the steam turbine (10) through the outlet of the first circulating water pipe (91) to generate electricity. The water vapor after power generation is cooled into water and returned to the third water pool (24). The water returned to the third water pool (24) still contains a certain amount of heat, and the water is hot water. The fourth water pump (14) is started to pump warm water in the third water pool (24) into the second circulating water pipe (92) in the water-gas co-containment tank (22), thereby heating the air in the water-gas co-containment tank (22).

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