Compressed gas energy storage system

Abstract

The utility model relates to energy storage technical field discloses a compressed gas energy storage system, including gas generating unit, first power generating unit and second power generating unit, gas generating unit includes first gas compressor and first motor, and first gas compressor exports first compressed gas through the drive of first motor, and first power generating unit is connected with gas generating unit, and first power generating unit includes water turbine, and first compressed gas drives water turbine movement to produce first electric energy, and second power generating unit is connected with gas generating unit through second gas compressor, and second power generating unit includes expander, and second gas compressor is used for driving expander to work to produce second electric energy after the pressure increase of first compressed gas, the utility model discloses through the form of coexistence of water turbine power generation and expander power generation to enrich the energy release mode of compressed gas energy storage system, has realized the stability enhancement and flexible regulation ability of electric power output, has improved the utilization of first compressed gas simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a compressed gas energy storage system. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Compressed gas energy storage systems primarily utilize electricity to compress air during off-peak hours and store it in a sealed space. During peak hours, the high-pressure air is released to drive an expander and a generator to produce electricity. These systems offer advantages such as large capacity and low cost. However, some traditional systems may emit carbon during the compression process, limiting their application in low-carbon energy systems.

[0004] Existing energy storage systems typically rely on a single compressed air as the circulating working fluid and directly drive an expander to generate electricity by releasing high-pressure air. However, due to the limited circulating working fluid and the single energy release mode, the single energy release mode affects the stable operation of the power system. Utility Model Content

[0005] The purpose of this invention is to at least solve the problem of the single energy release mode of existing energy storage systems affecting the stable operation of power systems. This purpose is achieved through the following technical solution: This utility model proposes a compressed gas energy storage system, comprising: A gas generating unit, the gas generating unit including a first motor and a first gas compressor for compressing gas, the first gas compressor outputting first compressed gas through the drive of the first motor; A first power generation unit is connected to the gas generating unit. The first power generation unit includes a water turbine, and the first compressed gas drives the water turbine to move to generate first electrical energy. The second power generation unit is connected to the gas generating unit via a second gas compressor. The second power generation unit includes an expander. The second gas compressor is used to pressurize the first compressed gas and drive the expander to do work to generate second electrical energy.

[0006] This invention discloses a compressed gas energy storage system comprising a gas generating unit, a first power generation unit, and a second power generation unit. The gas generating unit produces a first compressed gas, which can be input into both the first and second power generation units. In the first power generation unit, the first compressed gas directly drives a water turbine to generate first electrical energy. In the second power generation unit, the first compressed gas enters an expander, where it expands and performs work to generate second electrical energy. This invention enriches the energy release modes of a compressed gas energy storage system by combining water turbine power generation with expander power generation, forming a multi-energy complementary power generation system. This not only improves the utilization rate of the first compressed gas but also enhances the stability and flexible adjustment capability of power output, enabling precise response to grid frequency regulation needs and effectively balancing energy storage efficiency and power supply reliability.

[0007] In addition, the compressed gas energy storage system according to this utility model may also have the following additional technical features: In some embodiments of this utility model, the first power generation unit further includes: A water-gas co-containment chamber assembly, comprising at least two parallel water-gas co-containment chambers, wherein each water-gas co-containment chamber is provided with a first valve body between it and the gas generating unit; A water storage tank is connected to two water-air co-containment chambers via a first pump body. The water storage tank is used to store a first fluid, and the first pump body is used to pump the first fluid into each of the water-air co-containment chambers. A first generator is connected to the water turbine, and the first fluid flows through the water turbine and drives the first generator to generate electricity.

[0008] In some embodiments of this utility model, the gas generating unit further includes a first temperature regulating unit, which is connected to the water-gas co-containment chamber and is used to regulate the temperature of the first compressed gas in the water-gas co-containment chamber.

[0009] In some embodiments of this utility model, the water-gas co-containment chamber has a first receiving cavity, which includes a first sub-cavity and a second sub-cavity arranged from top to bottom. The first sub-cavity is used to store the first compressed gas, and the second sub-cavity is used to store the first fluid. The first temperature regulating unit includes a spray element and a second pump body. The spray element is disposed in the first compartment and is used to regulate the temperature of the first compressed gas. The second pump body is connected to the spray element and is used to deliver the first fluid to the spray element.

[0010] In some embodiments of this utility model, the compressed gas energy storage system further includes a thermoelectric power generation unit, which is disposed between the gas generating unit and the water-gas co-containment chamber assembly. The thermoelectric power generation unit includes a first heat exchanger and a thermoelectric power generation module. The thermoelectric power generation module includes a cold end structure and a hot end structure. The first compressed gas and the second fluid in the cold end structure both flow to the first heat exchanger. The first compressed gas and the second fluid exchange heat in the first heat exchanger to heat up the second fluid. The heated second fluid is then input into the hot end structure.

[0011] In some embodiments of this utility model, the compressed gas energy storage system further includes a second temperature regulating unit, which is connected to the first temperature regulating unit and is used to regulate the temperature of the first fluid input into the spray element. The heat energy of the second temperature regulating unit comes from geothermal energy and / or the second fluid flowing out of the hot end structure.

[0012] In some embodiments of this utility model, the second temperature regulation includes an evaporator, a first compressor, a condenser, and an expansion valve. The evaporator, the first compressor, the condenser, and the expansion valve are connected end to end in sequence to form a third fluid circuit for the flow of a third fluid. The second fluid and / or the geothermal energy exchange heat with the third fluid in the evaporator. The second heat exchanger is disposed between the spray element and the second pump body. The first fluid flows through the second heat exchanger and then enters the spray element. The second heat exchanger is connected to the condenser to form a fourth fluid loop for the flow of a fourth fluid. The fourth fluid exchanges heat with the first fluid in the second heat exchanger.

[0013] In some embodiments of this utility model, the second power generation unit includes: A gas storage assembly, comprising at least two parallel gas storage tanks, each of which is connected to a second gas compressor, and a second valve body is provided between the gas storage tank and the second gas compressor; The second generator is connected to both the second generator and the gas storage assembly, and a third valve body is provided between the expander and the gas storage assembly.

[0014] In some embodiments of this utility model, the compressed gas energy storage system further includes a third heat exchanger, which is connected to the third valve body and the expander respectively. The first compressed gas flows in the third heat exchanger, and the third heat exchanger is connected to the fourth fluid circuit. The fourth fluid exchanges heat with the first compressed gas in the third heat exchanger.

[0015] In some embodiments of this utility model, the second power generation unit further includes a fourth heat exchanger, which is connected to the expander. The first compressed gas flows out of the expander and enters the fourth heat exchanger. A fifth fluid flows inside the fourth heat exchanger, and the fifth fluid exchanges heat with the first compressed gas inside the fourth heat exchanger. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of a compressed gas energy storage system according to an embodiment of the present invention is shown. Figure 2 A schematic diagram of the structure between the first temperature regulating unit and the water-gas co-containment chamber of the compressed gas energy storage system according to an embodiment of the present invention is shown. Figure 3 A schematic diagram of the structure of a thermoelectric power generation module of a compressed gas energy storage system according to an embodiment of the present invention is shown.

[0017] The attached figures are labeled as follows: 10. Compressed gas energy storage system; 100. Gas generating unit; 110. First gas compressor; 120. First motor; 210. Water-air co-containment chamber assembly; 211. First compartment; 212. Second compartment; 220. Water storage tank; 230. Water turbine; 240. First generator; 250. First control valve; 260. First pump body; 270. First valve body; 280. Fourth valve body; 290. Fifth valve body; 310. Gas storage assembly; 320. Second valve body; 330. Expander; 340. Second generator; 350. Third valve body; 360. Pressure regulating valve; 400. Second gas compressor; 500. First temperature control unit; 510. Spraying component; 520. Second pump body; 600. Thermoelectric power generation unit; 610. First heat exchanger; 620. Thermoelectric power generation module; 621. Cold end structure; 622. Hot end structure; 700, Second temperature control unit; 710, Evaporator; 720, First compressor; 730, Condenser; 740, Expansion valve; 750, Second heat exchanger; 800. Third heat exchanger; 900, Fourth heat exchanger. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0019] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0020] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0021] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0022] like Figures 1 to 3 As shown, according to an embodiment of this utility model, a compressed gas energy storage system 10 is proposed, including a gas generating unit 100, a first power generation unit, and a second power generation unit. The gas generating unit 100 includes a first gas compressor 110 and a first motor 120. Driven by the first motor 120, the first gas compressor 110 outputs first compressed gas. Specifically, the first motor 120 uses off-peak electricity to drive the first gas compressor 110 to rotate. The first gas compressor 110 compresses gas at normal pressure into first compressed gas, converting electrical energy into the pressure potential energy and internal energy of the first compressed gas. The electricity allocation under the time-of-use pricing system includes peak electricity and off-peak electricity. Peak electricity refers to electricity during peak consumption periods, while off-peak electricity refers to electricity during off-peak periods. During peak consumption periods, there may be power shortages, while during off-peak periods, there may be power surpluses. By converting off-peak electricity into the potential energy of the first compressed gas and storing it, and then converting the potential energy back into electrical energy during peak electricity demand, the problem of power grid supply and demand imbalance is effectively alleviated, energy utilization efficiency and economic benefits are improved, and the regulation flexibility and operational stability of the power system are enhanced.

[0023] The first compressed gas is made of nitrogen or carbon dioxide. Existing technologies using compressed air as an energy storage medium are prone to equipment corrosion. In this embodiment, using nitrogen or carbon dioxide as the energy storage medium avoids this risk, thereby improving the safety and lifespan of the compressed gas energy storage system 10.

[0024] The first power generation unit is connected to the gas generation unit 100. The first power generation unit includes a water turbine 230. First compressed gas is introduced into the first power generation unit and acts on a first fluid within it. The first fluid is a liquid, such as water or other liquids. The gas expands, driving the liquid to move, which in turn drives the water turbine 230, which is linked to the liquid, to rotate. The water turbine 230 then drives a generator to produce first electrical energy. The first power generation unit includes an energy storage mode and an energy release mode. In energy storage mode, the first compressed gas and the first fluid enter the first power generation unit to store potential energy. In energy release mode, the first compressed gas drives the first fluid within the first power generation unit to move, which in turn drives the water turbine 230 to rotate and generate electricity. This method of generating electricity by driving the first fluid with the first compressed gas and then moving the water turbine 230 increases the potential energy of the first fluid, further improving the power generation efficiency of the first power generation unit.

[0025] The second power generation unit is connected to the gas generation unit 100 via the second gas compressor 400, which further pressurizes the first compressed gas output by the gas generation unit 100, giving the gas higher pressure and energy density. The second power generation unit includes an expander 330. The second gas compressor 400 is used to pressurize the first compressed gas and drive the expander 330 to do work and generate second electrical energy. That is, the pressurized gas enters the expander 330, which drives the expander 330 to rotate at high speed and do work, thereby efficiently converting the pressure energy of the gas into second electrical energy output.

[0026] This invention expands the energy release mode of the compressed gas energy storage system 10 by combining the first power generation unit and the second power generation unit, and forms a multi-energy complementary power generation system. That is, when the power generation of the first power generation unit and the second power generation unit fluctuates, the power generation of the other power generation unit can be adjusted to achieve a balance in power output, thereby ensuring the stability of power output and flexibly responding to the frequency regulation requirements of the power grid, while improving the utilization rate of the first compressed gas.

[0027] In some embodiments of this utility model, the first power generation unit further includes a water-gas co-containment chamber assembly 210, a water storage tank 220, and a first generator 240. The water-gas co-containment chamber assembly 210 is connected to the gas generation unit 100. The water-gas co-containment chamber assembly 210 includes at least two parallel water-gas co-containment chambers, namely a first water-gas co-containment chamber and a second water-gas co-containment chamber. The two water-gas co-containment chambers are used to receive and release the first fluid and the first compressed gas. In the energy storage mode, the first fluid and the first compressed gas enter the water-gas co-containment chamber. In the energy release mode, the first fluid and the first compressed gas are released from the water-gas co-containment chamber. Each water-gas co-containment chamber is equipped with a first valve 270 between itself and the gas generating unit 100. The first valve 270 is used to regulate and open / close the connection between the water-gas co-containment chamber and the compressed gas generating unit 100. When the first valve 270 is open, compressed gas is allowed to flow from the gas generating unit 100 into the water-gas co-containment chamber, enabling gas-water interaction. When the first valve 270 is closed, the connection between the two is severed, ensuring that each water-gas co-containment chamber can operate independently. Furthermore, under the precise control of the first valve 270, the system can flexibly manage the operating status of multiple water-gas co-containment chambers: by selectively opening or closing the corresponding first valve 270, some water-gas co-containment chambers can be put into operation mode, while others remain in standby mode. Simultaneously, the first valve 270 can also be operated synchronously, opening or closing all valves at the same time, allowing all water-gas co-containment chambers to work collaboratively to meet the needs of large-scale energy storage or rapid response. Setting up two or more water-gas co-containment chambers can increase the volume and enhance the overall compressed gas energy storage capacity.

[0028] The water storage tank 220 is connected to two water-air co-containment chambers via a first pump body 260. The water storage tank 220 is used to store the first fluid and can also supply and recover the first fluid. The first pump body 260 is used to pump the first fluid into each water-air co-containment chamber. Each water-air co-containment chamber is connected to the water storage tank 220 via a fourth valve body 280. The fourth valve body 280 is used to control whether the water-air co-containment chamber and the water storage tank 220 are connected. In energy storage mode, the fourth valve body 280 of the corresponding water-air co-containment chamber is open, and in energy release mode, the fourth valve body 280 of the corresponding water-air co-containment chamber is closed. The turbine 230 is connected to both the water storage tank 220 and the water-air co-containment chamber assembly 210 to form a circulation pipeline for the first fluid. A first control valve 250 is installed between the turbine 230 and the water-air co-containment chamber assembly 210. The first control valve 250 is used to regulate the on / off state or flow rate of the water to control the operating status and work capacity of the turbine 230, ensuring the stability and safety of the power generation process. A fifth valve body 290 is installed between each of the two water-air co-containment chambers and the first control valve 250. The fifth valve body 290 is used to independently control the water flow channel between the water-air co-containment chamber and the first control valve 250. In energy storage mode, the first fluid is pumped from the water storage tank 220 into the water-air co-containment chamber assembly 210 via the first pump body 260. In energy release mode, the first fluid in the water-air co-containment chamber returns to the water storage tank 220 via the turbine 230. The first generator 240 is connected to the water turbine 230. When the first fluid flows through the water turbine 230, the water turbine 230 drives the first generator 240 to generate electricity.

[0029] In some embodiments of this invention, the gas generating unit 100 further includes a first temperature regulating unit 500, which is connected to a water-gas co-containment chamber. Each water-gas co-containment chamber is connected to a first temperature regulating unit 500, which regulates the temperature of the first compressed gas within the water-gas co-containment chamber. During regulation, in energy storage mode, the first temperature regulating unit 500 lowers the temperature of the first compressed gas to achieve temperature equilibrium between the first compressed gas and the first fluid. In energy release mode, the first temperature regulating unit 500 raises the temperature of the first compressed gas, further increasing the temperature within the water-gas co-containment chamber to improve the round-trip efficiency of the first fluid during the energy release phase.

[0030] Figure 2 This is a schematic diagram of the structure between the first temperature regulating unit 500 and the water-air co-containment chamber in an embodiment of this utility model.

[0031] like Figure 2As shown, the water-gas co-containment chamber has a first receiving cavity for storing a first fluid and a first compressed gas. The first receiving cavity includes a first sub-cavity 211 and a second sub-cavity 212 arranged from top to bottom. The first sub-cavity 211 is used to store the first compressed gas, and the second sub-cavity 212 is used to store the first fluid. There is no clear physical separation interface between the first sub-cavity 211 and the second sub-cavity 212. Instead, the boundary is dynamically formed according to the relative storage and distribution of the first fluid and the first compressed gas during actual operation. This not only simplifies the chamber structure but also allows for automatic adjustment of the gas-liquid distribution according to the operating conditions. This facilitates flexible control of gas-liquid interaction and improves the adaptability and energy conversion efficiency of the system operation.

[0032] The first temperature regulating unit 500 includes a spray element 510 and a second pump body 520. The spray element 510 is disposed in the first compartment 211. The spray element 510 atomizes and sprays the first fluid, so that the fine droplets come into full contact with the high-temperature first compressed gas. By utilizing the heat absorption and heat exchange effect of liquid evaporation, the temperature of the first compressed gas is effectively reduced. The second pump body 520 is connected to the spray element 510 and is used to transport the first fluid in the second compartment 212 to the spray element 510, providing a stable cooling medium for the spraying process, which can improve the operational reliability of the entire compressed gas energy storage system 10.

[0033] See Figure 1 In some embodiments of this utility model, the compressed gas energy storage system 10 further includes a thermoelectric power generation unit 600. The thermoelectric power generation unit 600 is disposed between the gas generating unit 100 and the water-gas co-containment chamber assembly 210, and is used to recover the heat energy in the first compressed gas output by the first gas compressor 110 and convert it into direct current. This direct current can power the equipment and instruments of the compressed gas energy storage system 10. The thermoelectric power generation unit 600 includes a first heat exchanger 610 and a thermoelectric power generation module 620. The first heat exchanger 610 is used to recover the high-temperature heat in the first and second compressed gases and transport it to the thermoelectric power generation module 620. The thermoelectric power generation module 620 uses the heat obtained from the first heat exchanger 610 to realize thermoelectric power generation.

[0034] Figure 3 This is a schematic diagram of the structure of the thermoelectric power generation module 620 according to an embodiment of the present invention.

[0035] like Figure 3As shown, the thermoelectric power generation module 620 includes a cold-end structure 621 and a hot-end structure 622. A temperature difference is formed between the cold-end structure 621 and the hot-end structure 622 to achieve thermoelectric power generation. The first compressed gas and the second fluid in the cold-end structure 621 both flow to the first heat exchanger 610. That is, the second fluid flows from the cold-end structure 621 to the first heat exchanger 610, and at the same time, the first compressed gas also flows to the first heat exchanger 610. The first compressed gas and the second fluid exchange heat in the first heat exchanger 610, and the heated second fluid is input into the hot-end structure 622. A temperature difference is formed between the cold-end structure 621 and the hot-end structure 622 to achieve thermoelectric power generation within the thermoelectric power generation unit 600. The above structure utilizes the heat generated by the first compressed gas during energy storage and release, converting it into additional electrical energy output. This not only improves the overall energy utilization efficiency of the system but also enables the recovery and reuse of waste heat, enhancing the system's economy and environmental friendliness. At the same time, through the rational distribution and circulation of heat and cold flow, the continuity and stability of the thermoelectric power generation process are ensured.

[0036] In some embodiments of this utility model, the compressed gas energy storage system 10 further includes a second temperature regulation unit 700, which is connected to the first temperature regulation unit 500 and is used to regulate the temperature of the first fluid in the input spray component 510 to ensure precise control of the cooling effect of the first compressed gas during the spraying process. The heat energy sources of the second temperature regulation unit 700 mainly include two parts: one is the second fluid flowing out from the hot end structure 622, which carries a lot of heat after heat exchange with the hot end structure 622; the other is optional geothermal energy. By utilizing these heat sources, the second temperature regulation unit 700 can heat or cool the first fluid, so that it is cooled down before being sent into the spray component 510, thereby improving the cooling efficiency of the first compressed gas.

[0037] In some embodiments of this utility model, the second temperature regulating unit 700 includes an evaporator 710, a first compressor 720, a condenser 730, and an expansion valve 740. The evaporator 710, the first compressor 720, the condenser 730, and the expansion valve 740 are connected end to end in sequence, that is, the evaporator 710 is connected to the first compressor 720, the first compressor 720 is connected to the condenser 730, the condenser 730 is connected to the expansion valve 740, and the expansion valve 740 is connected to the evaporator 710 to form a third fluid circuit for the flow of a third fluid. The third fluid can circulate in the third fluid circuit, and the second fluid and / or geothermal energy exchange heat with the third fluid in the evaporator 710. Evaporator 710 is used to absorb heat from geothermal energy and the second fluid, and transfer the heat to the third fluid; first compressor 720 is used to increase the pressure and temperature of the third fluid, and enhance its heat release capacity; condenser 730 is used to allow the third fluid in a high temperature and high pressure state to release heat, and transfer the heat to the fourth fluid; expansion valve 740 is used to reduce the pressure and temperature of the third fluid, so that it returns to a state suitable for entering evaporator 710, so as to form a cycle. During operation, the evaporator 710 exchanges heat with the second fluid from the hot end structure 622 and / or geothermal energy, causing the third fluid flowing through the evaporator 710 to absorb heat and evaporate into a gaseous state. Subsequently, the gaseous third fluid is compressed by the first compressor 720, and after the pressure and temperature increase, it enters the condenser 730. In the condenser 730, the heat it carries is released to heat the first fluid that is about to be input into the spray element 510, so as to raise or lower its temperature, thereby precisely controlling the temperature of the spray liquid. Finally, the third fluid that has released heat through condensation is throttled and depressurized through the expansion valve 740, and returns to the low temperature and low pressure state before entering the evaporator 710, completing one cycle.

[0038] The second temperature control unit 700 also includes a second heat exchanger 750, which is disposed between the spray element 510 and the second pump body 520. The first fluid flows through the second heat exchanger 750 and then enters the spray element 510. The second heat exchanger 750 is connected to the condenser 730 to form a fourth fluid loop for the flow of the fourth fluid. The fourth fluid exchanges heat with the first fluid in the second heat exchanger 750 to achieve precise secondary temperature control of the first fluid input to the spray element 510, thereby further improving the effect of gas cooling or heating and the flexibility of system operation. During operation, the first fluid delivered by the second pump body 520 first flows through the second heat exchanger 750, where it undergoes efficient heat exchange with the fourth fluid. Simultaneously, the second heat exchanger 750 is connected to the aforementioned condenser 730, together forming a fourth fluid loop for the fourth fluid to circulate. In this loop, the fourth fluid can be drawn out from the condenser 730, and the heat absorbed from the third fluid is transferred to the first fluid as it flows through the second heat exchanger 750, preheating or further adjusting the temperature of the first fluid. Then, it returns to the condenser 730 or other heat exchange links in the system, forming a closed loop.

[0039] In some embodiments of this utility model, the second power generation unit includes a gas storage assembly 310, which includes at least two parallel gas storage tanks, namely a first gas storage tank and a second gas storage tank. The two gas storage tanks are used to receive and release the first compressed gas, and each gas storage tank is connected to a second gas compressor 400. In the energy storage mode of the second power generation unit, the first compressed gas enters the gas storage tank; in the energy release mode of the second power generation unit, the first compressed gas is released from the gas storage tank. A second valve body 320 is provided between each gas storage tank and the second gas compressor 400, and the second valve body 320 is used to control whether the second gas compressor 400 is connected to the gas storage tank. Under the control of the second control valve, some gas storage tanks can be in use mode while others are in standby mode. Of course, the second valve body 320 can also be opened or closed simultaneously to achieve simultaneous use of all gas storage tanks. Setting two or more gas storage tanks can increase the volume.

[0040] The second power generation unit also includes a second generator 340. An expander 330 is connected to both the second generator 340 and the gas storage assembly 310. A third valve 350 is provided between the expander 330 and the gas storage assembly 310. The third valve 350 is used to precisely control the gas passage between the expander 330 and the gas storage tank. When the third valve 350 is open, the first compressed gas in the gas storage tank can enter the expander 330, driving it to rotate at high speed and perform work, thereby driving the shaft connected to the second generator 340 to rotate, converting the pressure energy of the gas into the second electrical energy output. When the third valve 350 is closed, the gas passage can be cut off, keeping the gas storage tank in a sealed state, realizing stable pressure storage or time-sharing access to the gas.

[0041] In some embodiments of this utility model, the compressed gas energy storage system 10 further includes a third heat exchanger 800, which is connected to the third valve body 350 and the expander 330 respectively. The first compressed gas flows in the third heat exchanger 800, which is connected to a fourth fluid circuit. The fourth fluid exchanges heat with the first compressed gas in the third heat exchanger 800. That is, the fourth fluid circulating in the fourth fluid circuit can fully contact the first compressed gas at low or normal temperature in the third heat exchanger 800, and transfer its own heat to the first compressed gas through heat exchange, thereby increasing its temperature and internal energy, and thus obtaining additional energy before entering the expander 330. The first compressed gas after being heated has higher pressure potential energy and thermal energy. After entering the expander 330, it can release more energy to drive the expander 330 to do work, thereby driving the second generator 340 to output higher power second electrical energy, further improving the power generation efficiency of the expander 330.

[0042] In this embodiment, a pressure regulating valve 360 ​​is installed between the gas storage tank assembly and the water-gas co-containment chamber. Since the pressure inside the water-gas co-containment chamber continuously decreases during energy release mode, the gas storage tank assembly pressurizes the chamber. The pressure regulating valve 360, installed between the gas storage tank assembly and the water-gas co-containment chamber, maintains stable gas pressure within the chamber during the energy release state of the pumped hydraulic power generation unit. This ensures the driving capability of the first fluid and the working efficiency of the turbine 230, thereby improving the power generation efficiency and output stability of the pumped hydraulic power generation unit.

[0043] In some embodiments of this utility model, the second power generation unit further includes a fourth heat exchanger 900, which is connected to the expander 330. The first compressed gas flows out of the expander 330 and enters the fourth heat exchanger 900. A fifth fluid flows within the fourth heat exchanger 900, and the fifth fluid exchanges heat with the first compressed gas within the fourth heat exchanger 900. The first compressed gas transfers its waste heat to the fifth fluid, and after further cooling, it may be discharged from the system or undergo subsequent processing. The fifth fluid absorbs heat and its temperature rises, which can be used in other thermal energy utilization stages within the system. This achieves cascade utilization and secondary recovery of thermal resources within the system, effectively improving the energy utilization efficiency and economy of the entire compressed gas energy storage system 10.

[0044] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A compressed gas energy storage system, characterized in that, include: A gas generating unit, the gas generating unit including a first motor and a first gas compressor for compressing gas, the first gas compressor outputting first compressed gas through the drive of the first motor; A first power generation unit is connected to the gas generating unit. The first power generation unit includes a water turbine, and the first compressed gas drives the water turbine to move to generate first electrical energy. The second power generation unit is connected to the gas generating unit via a second gas compressor. The second power generation unit includes an expander. The second gas compressor is used to pressurize the first compressed gas and drive the expander to do work to generate second electrical energy.

2. The compressed gas energy storage system according to claim 1, characterized in that, The first power generation unit further includes: A water-gas co-containment chamber assembly, comprising at least two parallel water-gas co-containment chambers, wherein each water-gas co-containment chamber is provided with a first valve body between it and the gas generating unit; A water storage tank is connected to two water-air co-containment chambers via a first pump body. The water storage tank is used to store a first fluid, and the first pump body is used to pump the first fluid into each of the water-air co-containment chambers. A first generator is connected to the water turbine, and the first fluid flows through the water turbine and drives the first generator to generate electricity.

3. The compressed gas energy storage system according to claim 2, characterized in that, The gas generating unit further includes a first temperature regulating unit, which is connected to the water-gas co-containment chamber and is used to regulate the temperature of the first compressed gas in the water-gas co-containment chamber.

4. The compressed gas energy storage system according to claim 3, characterized in that, The water-gas co-containment chamber has a first receiving cavity, which includes a first sub-cavity and a second sub-cavity arranged from top to bottom. The first sub-cavity is used to store the first compressed gas, and the second sub-cavity is used to store the first fluid. The first temperature regulating unit includes a spray element and a second pump body. The spray element is disposed in the first compartment and is used to regulate the temperature of the first compressed gas. The second pump body is connected to the spray element and is used to deliver the first fluid to the spray element.

5. The compressed gas energy storage system according to claim 4, characterized in that, The compressed gas energy storage system further includes a thermoelectric power generation unit, which is disposed between the gas generating unit and the water-gas co-containment chamber assembly. The thermoelectric power generation unit includes a first heat exchanger and a thermoelectric power generation module. The thermoelectric power generation module includes a cold end structure and a hot end structure. The first compressed gas and the second fluid in the cold end structure both flow to the first heat exchanger. The first compressed gas and the second fluid exchange heat in the first heat exchanger to heat up the second fluid. The heated second fluid is then input into the hot end structure.

6. The compressed gas energy storage system according to claim 5, characterized in that, The compressed gas energy storage system further includes a second temperature regulation unit, which is connected to the first temperature regulation unit and is used to regulate the temperature of the first fluid input into the spray element. The heat energy of the second temperature regulation unit comes from geothermal energy and / or the second fluid flowing out of the hot end structure.

7. The compressed gas energy storage system according to claim 6, characterized in that, The second temperature control unit includes an evaporator, a first compressor, a condenser, and an expansion valve. The evaporator, the first compressor, the condenser, and the expansion valve are connected end to end in sequence to form a third fluid circuit for the flow of a third fluid. The second fluid and / or the geothermal energy exchange heat with the third fluid in the evaporator. The second heat exchanger is disposed between the spray element and the second pump body. The first fluid flows through the second heat exchanger and then enters the spray element. The second heat exchanger is connected to the condenser to form a fourth fluid loop for the flow of a fourth fluid. The fourth fluid exchanges heat with the first fluid in the second heat exchanger.

8. The compressed gas energy storage system according to claim 7, characterized in that, The second power generation unit includes: A gas storage assembly, comprising at least two parallel gas storage tanks, each of which is connected to a second gas compressor, and a second valve body is provided between the gas storage tank and the second gas compressor; The second generator is connected to both the second generator and the gas storage assembly, and a third valve body is provided between the expander and the gas storage assembly.

9. The compressed gas energy storage system according to claim 8, characterized in that, The compressed gas energy storage system further includes a third heat exchanger, which is connected to the third valve body and the expander respectively. The first compressed gas flows in the third heat exchanger, and the third heat exchanger is connected to the fourth fluid circuit. The fourth fluid exchanges heat with the first compressed gas in the third heat exchanger.

10. The compressed gas energy storage system according to claim 9, characterized in that, The second power generation unit also includes a fourth heat exchanger, which is connected to the expander. The first compressed gas flows out of the expander and enters the fourth heat exchanger. A fifth fluid flows inside the fourth heat exchanger, and the fifth fluid exchanges heat with the first compressed gas inside the fourth heat exchanger.

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