A multi-energy complementary water-gas co-storage energy system and energy storage method

Abstract

The application provides a multi-energy complementary water-gas co-storage energy system and energy storage method, and the embodiment utilizes valley electricity and new energy electricity to perform compressed air and water storage energy, utilizes the surplus electricity energy by means of air compressor compressed air, stores the compressed air in a gas storage tank, simultaneously, the working fluid liquid in the liquid storage part is extracted to a liquid chamber to form a high water head liquid level, and the surplus electricity is utilized to the maximum extent. In the energy release stage, the compressed air drives the working fluid liquid in the liquid chamber to flow to a water turbine generator to generate electricity, and the tail water of electricity generation can be discharged into the liquid storage part, so that the water turbine generator is kept in the optimal working condition under the stable pressure. When the water pressure of the water turbine generator is unstable or the liquid level in the liquid chamber is low to the warning line, the liquid is supplemented in time, and the air chamber is regulated by the cooling assembly, so that the water pressure of the water turbine generator can be quickly adjusted.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a multi-energy complementary water-gas co-storage energy system and energy storage method. Background Technology

[0002] Large-scale energy storage technology is an essential supporting technology for achieving grid peak shaving and renewable energy utilization. Among existing large-scale energy storage technologies, compressed air energy storage (CASS) has been a research hotspot and has undergone extensive research. Although CASS has been studied from thermodynamic, economic, and environmental perspectives, such systems are limited by two main factors: low efficiency and high power generation costs. Furthermore, the pressure of the released air in CASS is unstable, resulting in low utilization and significant energy loss. In addition, there are limitations in the application modes of compressed air; related technologies are mainly focused on energy storage and power generation, with insufficient exploration of multi-energy form energy utilization schemes and distributed functional modes, hindering the large-scale commercial application of this technology.

[0003] Among the related technologies, CN112796981A discloses a non-combustion compressed air energy storage system and method with high-efficiency thermal storage performance. It includes a compression system, an air storage system, a thermal storage system, a pressure stabilization system, and a turbine system. During air compression, the heat generated in the process is stored through the thermal storage system. When using compressed air to generate electricity, the air is heated through a heat transfer medium, improving power generation efficiency. Although the above-mentioned related technologies can effectively utilize the heat generated during air compression, reducing energy loss and improving power generation efficiency, they suffer from the problem of limited heat utilization methods. Simply using compressed air to generate heat is insufficient to meet the heating needs of the thermal storage system, resulting in low feasibility. Another related technology, CN102619668A, discloses a constant-pressure water-gas co-containment chamber power storage system, including a water-gas co-containment chamber, a gas compressor unit, a water pump unit, a water storage tank, and a water turbine. The gas compressor and water pump unit utilize surplus electricity from the power grid. The water pump unit draws water from the water storage tank through pipelines. The outlet of the gas compressor unit is connected to the water-gas co-containment chamber via valves and pipelines. The outlet of the water-gas co-containment chamber is connected to the water turbine via pipelines and valves, and the water turbine drives a generator to produce electricity. Therefore, there is an urgent need to develop a multi-energy complementary water-gas co-containment energy storage system and method, explore multi-energy storage and distributed energy supply modes, maximize the utilization of stored energy, and ensure the stability and high efficiency of the energy storage system. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] To achieve the above objectives, this application proposes a multi-energy complementary water-gas co-storage energy system, comprising:

[0006] An air compression energy storage unit includes an air compression assembly and at least two air storage tanks; wherein both air storage tanks are connected to the air compression assembly via air energy storage pipelines and are used to store compressed air generated by the air compression assembly.

[0007] The liquid storage and power generation unit includes a liquid storage device for mutual circulation of working fluid, a gas-liquid co-existing tank, a hydro-generator, and a cooling component; wherein the gas-liquid co-existing tank is provided with a heat insulation component to divide it into a gas chamber for containing gas and a liquid chamber for containing working fluid; wherein the gas chamber is connected to the gas storage tank; the liquid chamber is connected to the liquid storage device, and the input end of the hydro-generator is connected to the liquid chamber to allow the working fluid to enter the hydro-generator to generate electricity; the cooling component includes a spray device connected to the liquid storage device, through which the working fluid is sprayed upwards towards the gas chamber.

[0008] In some embodiments, the air compression energy storage unit further includes an air release component, which is connected to the output end of the air storage tank via an air release pipeline. Compressed air is introduced into the air release component to expand and generate electricity.

[0009] In some embodiments, a heat exchange unit is further included, which is connected to the air compression assembly and the air energy release assembly for heat exchange, respectively, for storing the compression heat generated by the air compression assembly and providing heat to the air energy release assembly.

[0010] In some embodiments, the heat exchange unit includes an oil storage tank storing a heat exchange medium and a multi-stage interstage heat exchanger connected to the oil storage tank; the heat exchange medium in the oil storage tank is introduced into the interstage heat exchanger and, after exchanging heat with compressed air, flows back into the oil storage tank.

[0011] In some embodiments, the heat exchange unit further includes an electric water heater; the electric water heater and the oil storage tank are connected for heat exchange via an oil-water cooler; the output end and input end of the oil storage tank are respectively connected to the input end and output end of the hot side of the oil-water cooler; the input end of the cold side of the oil-water cooler is connected to the liquid storage device, and its output end is connected to the electric water heater.

[0012] In some embodiments, the heat exchange unit further includes a second heat exchanger; the cold side output end of the second heat exchanger includes a first outlet and a second outlet; the hot side input end and output end of the second heat exchanger are respectively connected to the output end and input end of the oil storage tank; the cold side input end of the second heat exchanger is connected to the gas storage tank; the first outlet and the second outlet are respectively connected to the gas chamber and the air release pipeline.

[0013] In some embodiments, the cooling assembly further includes an air-cooling component disposed above the air chamber for cooling the air chamber.

[0014] In some embodiments, the air compression assembly further includes an injection device; wherein the injection device is connected in parallel to the air storage pipeline via a bypass pipe; wherein the compressed air ultimately output by the interstage heat exchanger is input to the air storage tank via the air storage pipeline and the injection device.

[0015] In some embodiments, the system further includes an energy control unit and a new energy power unit, wherein the new energy power unit, the liquid storage power unit, and the air compression energy storage unit are all electrically connected to the energy control unit to achieve power regulation.

[0016] In some embodiments, an energy storage method for a multi-energy complementary water-gas co-storage energy system is proposed, which generates electricity using the energy storage system described in any of the above embodiments, including the following process:

[0017] Energy storage stage: The compressed air generated by the operation of the air compression component is introduced into the multi-stage interstage heat exchanger and exchanges heat with the heat exchange medium in the oil storage tank. After the compressed air is introduced into at least two air storage tanks through the air energy storage pipeline and the injection device, at least one air storage tank is filled with compressed air; at the same time, the working liquid in the liquid storage device is introduced into the liquid chamber.

[0018] Energy release phase: includes a first energy release condition and a second energy release condition; wherein, in the first energy release condition, compressed air is output from the gas storage tank to the gas chamber; the pressure in the liquid chamber is adjusted by the compressed air pressure in the gas chamber and the liquid level of the working fluid in the liquid chamber, and the working fluid in the liquid chamber is output to the hydro-generator to generate electricity, so that the hydro-generator is kept in the optimal operating condition; wherein the pressure in the gas chamber is adjusted by activating the cooling component and adjusting the capacity of the compressed air in the gas chamber;

[0019] In the second energy release condition, compressed air is output from the gas storage tank to the second heat exchanger to exchange heat with the heat exchange medium output from the oil storage tank; the compressed air after heat exchange enters the air energy release component through the air energy release pipeline to expand and do work; at the same time, the heat exchange medium after heat exchange returns to the oil storage tank; the heat exchange medium in the oil storage tank enters the oil-water cooler to heat the working liquid, and then the working liquid is heated by the electric water heater.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of a multi-energy complementary water-gas co-storage energy system proposed in an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of a multi-energy complementary water-gas co-storage energy system proposed in an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the structure of a multi-energy complementary water-gas co-storage energy system proposed in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the structure of a multi-energy complementary water-gas co-storage energy system proposed in an embodiment of this application;

[0026] In the diagram, 1. Air compressor; 2. Air energy storage pipeline; 3. Air energy release assembly; 4. Air energy release pipeline; 5. Second air storage tank; 6. First air storage tank; 7. Air-cooled component; 8. Liquid storage component; 9. Gas-liquid coexistence tank; 10. Gas chamber; 11. Liquid chamber; 12. Heat insulation component; 13. Hydrogen generator; 14. Spray system; 15. Oil storage tank; 16. First heat exchanger; 17. Second heat exchanger; 18. Spray device; 19. Bypass pipeline; 20. First pressure control valve ; 21. Second pressure control valve; 22. First flow control valve; 23. Transformer; 24. Second flow control valve; 25. First high-pressure water pump; 26. Third pressure control valve; 27. Water valve; 28. First low-pressure water pump; 29. ​​Second low-pressure water pump; 30-31. Flow control valve; 32. Electric water heater; 33. First pipeline pump; 34. Second pipeline pump; 35. Thermal oil heater; 36. Oil-water cooler; 37. Third heat exchanger; 38. Fourth heat exchanger. Detailed Implementation

[0027] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0028] See Figure 1To achieve the above objectives, this application proposes a multi-energy complementary water-air co-storage energy system, comprising an air compression energy storage unit and a liquid storage work unit; wherein the air compression unit includes an air compression component and at least two air storage tanks, the at least two air storage tanks being respectively connected to the air compression component for storing compressed air generated by the air compression component; in other words, the air compression unit includes an air compression component and at least two or more air storage tanks; wherein in this embodiment, the air compression component is used to compress air and generate compressed air, and the compressed air energy storage pipeline 2 is introduced into the air storage tank for storage.

[0029] The air compression assembly can be understood as a multi-stage air compressor 1 connected in series. Air is introduced into the gas inlet of the primary air compressor 1 and compressed into compressed air after passing through the multi-stage air compressor 1. The gas outlet of the final air compressor 1 is connected to at least two air storage tanks. It should be explained that the total capacity of all air storage tanks is greater than the total amount of compressed air generated by the air compression assembly. Therefore, in this embodiment, at least one of the two air storage tanks is filled with compressed air. In embodiments including multiple air storage tanks, only one air storage tank has a lower pressure than the other air storage tanks, and the other air storage tanks are filled with compressed air. Based on the pressure in the air storage tanks, the air storage tank filled with compressed air is designated as a high-pressure air storage tank, and the air storage tank not filled with compressed air is designated as a low-pressure air storage tank. For example, as shown... Figure 1 The air compression unit shown includes a three-stage air compressor 1 connected in series and two air storage tanks. Each air storage tank has a gas inlet and a gas outlet. In this embodiment, the two air storage tanks are a first air storage tank 6 and a second air storage tank 5, wherein the first air storage tank 6 is a high-pressure air storage tank and the second air storage tank 5 is a low-pressure air storage tank. The gas inlets of both the first air storage tank 6 and the second air storage tank 5 are connected to the gas outlet of the air compressor 1 for storing compressed air.

[0030] The liquid storage and work unit includes a liquid storage unit 8 and a gas-liquid coexistence tank 9, both of which contain a certain volume of working liquid and the working liquids between them can circulate. The volume of the liquid storage unit 8 is much larger than that of the gas-liquid coexistence tank 9. The liquid storage unit 8 is located above the heat storage unit. During most operating conditions of the liquid storage and work unit, the working liquid in the liquid storage unit 8 flows into the gas-liquid coexistence tank 9 in one direction through the pump.

[0031] In this embodiment, the gas-liquid coexistence tank 9 is a tank structure with a certain volume. A heat insulation component 12 divides it into a gas chamber 10 for containing gas and a liquid chamber 11 for containing the working fluid, with the liquid chamber 11 located below the gas chamber 10. Those skilled in the art will understand that the liquid chamber 11 and the gas chamber 10 are mutually insulated and not interconnected spatial structures, but both include an input end and an output end. The input and output ends of the gas chamber 10 are connected to a gas storage tank, allowing for the exchange of compressed air between the gas chamber 10 and the gas storage tank. The input end of the liquid chamber 11 is connected to a liquid storage device 8, and its output end is connected to a water turbine generator 13, allowing the working fluid to enter the water turbine generator 13 to generate electricity. A first flow control valve 22 is installed on the connecting pipeline between the output end of the liquid chamber 11 and the water turbine generator 13. In this embodiment, the capacity of the liquid chamber 11 and the gas chamber 10 depends on the capacity of the working liquid and gas contained therein. That is, the heat insulation member 12 will move vertically in accordance with the capacity of the liquid chamber 11 and the gas chamber 10. When the liquid level of the working liquid in the liquid chamber 11 rises, the heat insulation member 12 moves upward; when the liquid level of the working liquid in the liquid chamber 11 falls, the heat insulation member 12 moves downward.

[0032] Examples such as Figure 1 As shown, the input end of the air chamber 10 is connected to the first air storage tank 6, and its output end is connected to the second air storage tank 5 through the second pressure control valve 21. A first pipeline pump 33 is installed on the pipeline between the output end of the air chamber 10 and the second air storage tank 5. In this embodiment, compressed air from the first air storage tank 6 can be used to fill the air chamber 10, and the compressed air recovered from the air chamber 10 can be used to fill the second air storage tank 5, thereby realizing the recovery and utilization of compressed air. At the same time, the output end of the second air storage tank 5 is connected to the output end of the first air storage tank 6, and a third pressure control valve 26 is installed on the connecting pipeline between the two, which can be used to introduce the compressed air in the second air storage tank 5 into the air release pipeline 4. In this embodiment, the working fluid in the liquid storage device 8 flows into the gas-liquid coexistence tank 9 through the first high-pressure water pump 25. A second flow control valve 24 is installed on the pipeline connecting the liquid storage device 8 and the gas-liquid coexistence tank 9. The flow rate of the working fluid in the liquid chamber 11 of the liquid storage device 8 is controlled by the second flow control valve 24. The input end of the liquid chamber 11 is connected to the liquid storage device 8, and its output end is connected to the water turbine generator 13, so that the working fluid enters the water turbine generator 13 to generate electricity.

[0033] In this embodiment, the liquid storage power unit also includes a cooling component. It is understood that during the power generation process of the hydro-generator 13, to maintain the hydro-generator 13 in optimal operating condition, it is necessary to adjust the pressure in the gas chamber 10 and the liquid level of the working fluid in the liquid chamber 11. A head monitoring device can be installed at the output end of the liquid chamber 11 to monitor the operating condition of the hydro-generator 13 in real time. In this embodiment, the cooling component can be used to adjust the pressure in the gas chamber 10. The cooling component includes a spray component 14 connected to the liquid storage component 8. A second low-pressure water pump 29 and a water valve 27 are installed on the pipeline connecting the liquid storage component 8 and the spray component 14. The second low-pressure water pump 29 and the water valve 27 are used to introduce the working fluid from the liquid storage component 8 into the spray component 14, achieving the purpose of spraying the working fluid above the gas chamber 10 to cool and depressurize the gas chamber 10, thereby regulating the operating condition of the hydro-generator 13.

[0034] Therefore, this embodiment utilizes off-peak electricity and new energy power for compressed air and water energy storage. Surplus electricity is utilized by compressing air using an air compression component and storing it in an air tank. Simultaneously, surplus electricity draws the working fluid from the accumulator 8 to the liquid chamber 11, creating a high head level and maximizing the utilization of excess power. During the energy release phase, compressed air propels the working fluid in the liquid chamber 11 towards the hydro-generator 13 for power generation. The pressure within the air chamber 10 is adjusted to maintain the hydro-generator 13 at a stable pressure, ensuring it operates at its optimal condition. When the water pressure in the hydro-generator 13 is unstable or the liquid level in the liquid chamber 11 drops to the warning line, the accumulator 8 replenishes the working fluid to the liquid chamber 11, and the cooling component regulates the pressure in the air chamber 10, rapidly adjusting the water pressure and maintaining the hydro-generator 13 at its optimal operating condition. Furthermore, the tailwater from the hydro-generator 13 after generating power is discharged into the accumulator 8, achieving water resource recovery.

[0035] In some embodiments, the air compression energy storage unit further includes an air release component 3, which is connected to the output end of the air storage tank via an air release pipeline 4. Compressed air is introduced into the air release component 3 to expand and generate electricity.

[0036] For example, such as Figure 2 The air compression energy storage unit shown also includes an air release component 3, which can be understood as an air turbine and a generator. The air turbine is connected to the output end of the air storage tank through the air release pipeline 4, so that the compressed air output from the air storage tank is fed into the air turbine to expand and do work, thereby driving the generator to generate electricity.

[0037] In some embodiments, the energy storage system further includes a heat exchange unit, which is connected to the air compression assembly and the air energy release assembly 3 for heat exchange, and is used to store the compression heat generated by the air compression assembly and provide heat to the air energy release assembly 3.

[0038] The energy storage system also includes a heat exchange unit, in which both the air compression component and the air energy release component 3 have heat loss during operation. This application recovers the heat generated by the air compression component during operation by setting up the heat exchange unit, and releases the recovered heat to assist the operation of the air energy release component 3 during operation, thereby achieving a higher power generation effect.

[0039] In some embodiments, the heat exchange unit includes an oil storage tank 15 storing a heat exchange medium and a multi-stage interstage heat exchanger connected to the oil storage tank 15; the heat exchange medium in the oil storage tank 15 flows into the interstage heat exchanger, exchanges heat with compressed air, and then flows back into the oil storage tank 15. Examples include... Figure 2 As shown, the multi-stage interstage heat exchanger includes a first heat exchanger 16, a third heat exchanger 37, and a fourth heat exchanger 38; each of these exchanges heat with the compressed air output from the three-stage air compressor 1 connected in series. Specifically, each of the first heat exchanger 16, the third heat exchanger 37, and the fourth heat exchanger 38 includes a hot side and a cold side; a cold heat exchange medium input from the oil storage tank 15 is introduced into the cold side of each heat exchanger, and compressed air output from the three-stage air compressor 1 connected in series is introduced into the hot side of each heat exchanger for heat exchange. The heat exchange medium after heat exchange flows back to the oil storage tank 15, while the compressed air output from the final three-stage air compressor 1 connected in series is stored after heat exchange. Therefore, in this embodiment, the oil storage tank 15 and the multi-stage interstage heat exchanger are used to recover a large amount of heat generated during the air compression process of the air compression assembly.

[0040] In some embodiments, the heat exchange unit further includes an electric water heater 32; the electric water heater 32 is connected to the oil storage tank 15 via an oil-water cooler 36 for heat exchange; the output end and input end of the oil storage tank 15 are respectively connected to the input end and output end of the hot side of the oil-water cooler 36; the input end of the cold side of the oil-water cooler 36 is connected to the liquid storage device 8, and the output end of its cold side is connected to the electric water heater 32.

[0041] Examples such as Figure 3As shown, the energy storage system also includes an electric water heater 32. The electric water heater 32 is connected to the oil storage tank 15 via an oil-water cooler 36 for heat exchange. Specifically, the oil-water cooler 36 includes a hot side and a cold side. The output end of the oil storage tank 15 is connected to the input end of the hot side of the oil-water cooler 36, and the input end of the oil storage tank 15 is connected to the output end of the hot side of the oil-water cooler 36. The input end of the cold side of the oil-water cooler 36 is connected to the liquid storage device 8, and its output end is connected to the electric water heater 32. Heat exchange occurs by introducing the hot heat exchange medium from the oil storage tank 15 into the hot side of the oil-water cooler 36 and the working fluid output from the liquid storage device 8 into the cold side of the oil-water cooler 36. The heat exchange medium after heat exchange flows back to the oil storage tank 15, while the working fluid after heat exchange is input into the electric water heater 32. In this embodiment, the electric water heater 32 can be connected to a power source to heat the working fluid stored within it. The heated working fluid can then be used for heating, etc. In some designs, the electric water heater 32 and the liquid storage unit 8 are connected by a pipeline, and a first low-pressure water pump 28 is installed on the pipeline. This means that the heat exchange medium in the electric water heater 32 and the working liquid in the liquid storage unit 8 are the same medium, which can be exemplarily water. Figure 2 and Figure 3 As shown.

[0042] In some embodiments, the heat exchange unit further includes a second heat exchanger 17; the cold side output end of the second heat exchanger 17 includes a first outlet and a second outlet; the hot side input end and output end of the second heat exchanger 17 are respectively connected to the output end and input end of the oil storage tank 15; the cold side input end of the second heat exchanger 17 is connected to the gas storage tank, and the first outlet and the second outlet are respectively connected to the gas chamber 10 and the air release pipeline 4.

[0043] like Figure 2 and Figure 3 As shown, the heat exchange unit also includes a second heat exchanger 17, which includes a hot side and a cold side. Specifically, in this embodiment, the cold side output of the second heat exchanger 17 includes a first outlet and a second outlet. The hot side input of the second heat exchanger 17 is connected to the output of the oil storage tank 15, and the hot side output of the second heat exchanger 17 is connected to the input of the oil storage tank 15. That is, the hot heat exchange medium in the oil storage tank 15 flows into the hot side of the second heat exchanger 17, and the heat exchange medium after heat exchange flows back into the oil storage tank 15. A flow control valve 30 is installed on the connecting pipe between the hot side input of the second heat exchanger 17 and the output of the oil storage tank 15, and a flow control valve 31 is also installed on the connecting pipe between the hot side output of the second heat exchanger 17 and the input of the oil storage tank 15. In order to ensure the temperature of the heat exchange medium output from the oil storage tank 15, a heat transfer oil heater 35 can be installed on the connecting pipe between the input end of the hot side of the second heat exchanger 17 and the output end of the oil storage tank 15 to further heat the working liquid entering the second heat exchanger 17.

[0044] In this embodiment, the heat exchange medium introduced into the hot side of the second heat exchanger 17 exchanges heat with the compressed air introduced into the cold side of the second heat exchanger 17. The heated compressed air enters the air chamber 10 and the air energy release pipeline 4 through the first outlet and the second outlet, respectively. The compressed air entering the air energy release pipeline 4 finally enters the air turbine to do work. Therefore, in this embodiment, the compressed air that has been heated by the second heat exchanger 17 is introduced into the air turbine to drive the generator to generate electricity. The heat exchange medium is the compressed air that has been heated before entering the air turbine, which can improve the power generation efficiency of the air energy release component 3. However, the power generated by the generator is limited by the gas capacity and the power output is relatively small. It can be directly supplied to the electrical components in the energy storage system in this embodiment without being connected to the grid.

[0045] It should be explained that, in this embodiment, the output end of the gas storage tank is connected to the cold side input end of the gas chamber 10 and the second heat exchanger 17, respectively. A first pressure control valve 20 and a shared second pipeline pump 34 are provided on the connecting pipeline between the gas storage tank and the gas chamber 10 and on the connecting pipeline between the gas storage tank and the cold side input end of the second heat exchanger 17.

[0046] In some embodiments, the cooling assembly further includes an air-cooling component 7, which is disposed above the air chamber 10 for cooling the air chamber 10. Examples include... Figure 4 As shown, during the operation adjustment of the hydro-generator 13, the air-cooled component 7 can be installed above the air chamber 10. While the spray component 14 cools and depressurizes the air chamber 10, the air-cooled component 7 further assists in cooling and depressurizing the air chamber 10. In this embodiment, the air-cooled component 7 can be electrically driven and generates wind that blows towards the air chamber 10. While the air chamber 10 is cooled by the spray component 14, the wind further accelerates the gas flow around the air chamber 10.

[0047] In some embodiments, the air compression assembly further includes an injection device 18; wherein the injection device 18 is connected in parallel to the air storage pipeline 2 via a bypass pipe 19; wherein the compressed air finally output from the interstage heat exchanger is input to the air storage tank via the air storage pipeline 2 and the injection device 18 respectively.

[0048] Examples such as Figure 4As shown, the air compression assembly also includes an injection device 18, wherein a bypass pipe 19 is connected in parallel to the air storage pipeline 2, and both the input and output ends of the bypass pipe 19 are connected to the air storage pipeline 2. According to the flow path of compressed air in the air storage pipeline 2, the input end of the bypass pipe 19 is located downstream of the first heat exchanger 16, meaning that after heat exchange in the first heat exchanger 16, the compressed air passes through both the air storage pipeline 2 and the bypass pipe 19, while the output end of the bypass pipe 19 is located upstream of the air storage tank. In this application, the injection device 18 is used to regulate the output flow rate of the compressed air, maintaining the output flow rate and pressure of the compressed air at the optimal compression efficiency state of the air compressor 1, thereby improving the compression efficiency of the compressed air. It is known that both the air storage pipeline 2 and the bypass pipe 19 are equipped with a third pressure control valve 26.

[0049] In some embodiments, the system further includes an energy control unit and a new energy power unit, wherein the new energy power unit, the liquid storage power unit, and the air compression energy storage unit are all electrically connected to the energy control unit to achieve power regulation.

[0050] For example, the energy storage system also includes a control unit and a new energy power unit, wherein the new energy power unit and the control unit are connected, and the new energy power unit includes wind power and other new energy power generation forms. In this embodiment, the power generated by wind power generation, as well as the power generated by the hydro generator 13 and the air turbine, all enter the control unit after passing through the transformer 23. The control unit regulates and connects the generated power to the grid. The control unit can regulate the amount of power generated by this system that is connected to the grid, and supply power to various energy-consuming components such as pumps, cooling components, air compressor 1, and electric heaters in the energy storage system. Therefore, this embodiment has advantages such as no additional combustion, clean and environmentally friendly, high efficiency, distributed power supply, multi-energy storage, and high energy utilization. It can distribute and allocate solar energy, wind power generation, air compressor energy storage unit power generation, and liquid storage power generation, and the power generation of the liquid storage unit can increase the power generation per unit time by generating power together. The excess power can be connected to the grid, and some power can be used by the system itself. It can also dynamically allocate the energy required for heating and improve the flexibility of energy supply.

[0051] In some embodiments, according to the second aspect of this application, an energy storage method for a multi-energy complementary water-gas co-storage energy system is proposed, which generates electricity using the energy storage system in any of the above embodiments, including the following process:

[0052] Energy storage stage: The compressed air generated by the operation of the air compression component is introduced into the multi-stage interstage heat exchanger and exchanges heat with the heat exchange medium in the oil storage tank 15. The compressed air is then introduced into at least two air storage tanks through the air energy storage pipeline 2 and the injection device 18, and at least one air storage tank is filled with compressed air; at the same time, the working liquid in the liquid storage device 8 is introduced into the liquid chamber 11.

[0053] Energy release phase: includes a first energy release condition and a second energy release condition; in the first energy release condition, compressed air is output from the gas storage tank to the gas chamber 10; the pressure in the liquid chamber 11 is adjusted by the pressure of the compressed air in the gas chamber 10 and the liquid level of the working fluid in the liquid chamber 11, and the working fluid in the liquid chamber 11 is output to the hydro-generator 13 to generate electricity, so that the hydro-generator 13 is kept in the optimal operating condition; the pressure in the gas chamber 10 is adjusted by starting the cooling component and adjusting the capacity of the compressed air in the gas chamber 10.

[0054] In the second energy release condition, compressed air is output from the air storage tank to the second heat exchanger 17 to exchange heat with the heat exchange medium output from the oil storage tank 15; the compressed air after heat exchange enters the air energy release assembly 3 through the air energy release pipeline 4 to expand and do work; at the same time, the heat exchange medium after heat exchange returns to the oil storage tank 15; the heat exchange medium in the oil storage tank 15 enters the oil-water cooler 36 to heat the working liquid, and then the working liquid is heated by the electric water heater.

[0055] Specifically, the energy control unit uses off-peak electricity and new energy power to drive the air compression assembly to compress air, and recovers the heat of the compressed air generated by the air compressor 1 through the first heat exchanger 16, the third heat exchanger 37, and the fourth heat exchanger 38 in stages. The heat exchange medium after heat recovery flows into the oil storage tank 15 for storage. The compressed air after heat exchange with the first heat exchanger 16 enters the air storage tank through the bypass pipe 19 and the air energy storage pipe 2. The air compression pressure is adjusted by the third pressure control valve 26 to maintain the air compressor 1 at the optimal compression efficiency. Finally, the compressed air is stored in the air storage tank to complete the compressed air energy storage process. At the same time, during this stage, the working fluid liquid in the liquid storage device 8 is introduced into the liquid chamber 11 to maintain the liquid level in the liquid chamber 11 at a certain height.

[0056] In the energy release phase of this embodiment, the working fluid in the liquid chamber 11 is output to the hydro-generator 13 to generate electricity. As the liquid level in the liquid chamber 11 continuously decreases, to ensure that the hydro-generator 13 remains in optimal operating condition, compressed air can be directly output from the first air storage tank 6 and / or the second air storage tank 5, and then through the first pressure control valve 20 to the air chamber 10. This increases the pressure in the air chamber 10, maintaining the hydro-generator 13 at the optimal pressure head. When the pressure detected by the head monitoring device is too high, the compressed air in the air chamber 10 is discharged through the second pressure control valve 21 to the second air storage tank 5, where the pressure is lower, thus reducing the pressure in the air chamber 10. Simultaneously, the cooling components can be activated based on the pressure measurement value of the head monitoring device, turning on the air-cooling component 7 and / or the spray component 14 to cool and depressurize the air chamber 10. When the pressure of the head monitoring device is too low, the second flow control valve 24 is opened to replenish the liquid in the liquid chamber 11 using the liquid storage device 8, thereby raising the liquid level of the working fluid. At the same time, the second pressure control valve 21 is closed. When the pressure of the head monitoring device is too low and the improvement is not significant, the flow rate of compressed air entering the air chamber 10 can be increased and the temperature of the compressed air entering the air chamber 10 can be increased. In order to increase the temperature of the compressed air entering the air chamber 10, the compressed air in the first air storage tank 6 and / or the second air storage tank 5 can be passed through the second heat exchanger 17 and exchanged with the heat exchange medium in the second heat exchanger 17. The heated compressed air is then introduced into the air chamber 10 to achieve the purpose of rapid heating and pressurization.

[0057] Furthermore, in this embodiment, when the heat exchange medium in the electric heater is the same as the working liquid in the liquid storage unit 8, the electric heater can be connected to the liquid storage unit 8 to output the working liquid in the liquid storage unit 8 to the electric heater, thereby achieving the effect of replenishing the electric heater. After the heat exchange medium in the oil storage tank 15 enters the oil-water cooler 36 to heat the working liquid output from the liquid storage unit 8, the heated working liquid can be heated by an electric water heater for external heating.

[0058] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0059] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A multi-energy complementary water-gas co-storage energy system, characterized in that, include An air compression energy storage unit includes an air compression assembly and at least two air storage tanks; both air storage tanks are connected to the air compression assembly via air energy storage pipelines and are used to store compressed air generated by the air compression assembly. The compressed air energy storage unit also includes an air energy release component, which is connected to the output end of the air storage tank through an air energy release pipeline. Compressed air is introduced into the air energy release component to expand and generate electricity. The liquid storage and power generation unit includes a liquid storage device for mutual circulation of working fluid, a gas-liquid co-existing tank, a hydro-generator, and a cooling component. The gas-liquid co-existing tank is divided into a gas chamber and a liquid chamber by a heat-insulating component. The gas chamber is connected to the gas storage tank. The liquid chamber is connected to the liquid storage device, and the input end of the hydro-generator is connected to the liquid chamber to allow the working fluid to enter the hydro-generator and generate electricity. The cooling component includes a spray component and an air-cooling component connected to the liquid storage device. The spray component carries the working fluid and sprays it upwards onto the gas chamber. The air-cooling component is positioned above the gas chamber to cool it. as well as A heat exchange unit is connected to the air compression assembly and the air energy release assembly for heat exchange, and is used to store the compression heat generated by the air compression assembly and provide heat to the air energy release assembly; the heat exchange unit includes an oil storage tank storing a heat exchange medium, a multi-stage interstage heat exchanger connected to the oil storage tank, a second heat exchanger, and an electric water heater; the electric water heater is connected to the oil storage tank for heat exchange through an oil-water cooler; The energy release phase includes a first energy release condition and a second energy release condition. In the first energy release condition, compressed air is output from the gas storage tank to the gas chamber. The pressure in the liquid chamber is adjusted by the compressed air pressure in the gas chamber and the liquid level of the working fluid in the liquid chamber, and the working fluid in the liquid chamber is output to the hydro-generator to generate electricity. In the second energy release condition, compressed air is output from the gas storage tank to the second heat exchanger to exchange heat with the heat exchange medium output from the oil storage tank. The compressed air after heat exchange enters the air energy release component to expand and do work. At the same time, the heat exchange medium after heat exchange returns to the oil storage tank. The heat exchange medium in the oil storage tank enters the oil-water cooler to heat the working fluid, and then the working fluid is used for heating through the electric water heater.

2. The energy storage system according to claim 1, characterized in that, The heat exchange medium in the oil storage tank is introduced into the interstage heat exchanger and exchanges heat with compressed air before flowing back into the oil storage tank.

3. The energy storage system according to claim 2, characterized in that, The output and input ends of the oil storage tank are respectively connected to the input and output ends of the hot side of the oil-water cooler; the input end of the cold side of the oil-water cooler is connected to the liquid storage device, and its output end is connected to the electric water heater.

4. The energy storage system according to claim 3, characterized in that, The cold side output of the second heat exchanger includes a first outlet and a second outlet; the hot side input and output of the second heat exchanger are respectively connected to the output and input of the oil storage tank; the cold side input of the second heat exchanger is connected to the gas storage tank; the first outlet and the second outlet are respectively connected to the gas chamber and the air release pipeline.

5. The energy storage system according to claim 3, characterized in that, The air compression assembly also includes an injection device; wherein the injection device is connected in parallel to the air energy storage pipeline via a bypass pipe; wherein the compressed air finally output by the interstage heat exchanger is input to the air storage tank via the air energy storage pipeline and the injection device respectively.

6. The energy storage system according to any one of claims 1-5, characterized in that, It also includes an energy control unit and a new energy power unit, wherein the new energy power unit, the liquid storage power unit and the air compression energy storage unit are all electrically connected to the energy control unit to realize power regulation.

7. An energy storage method for a multi-energy complementary water-gas co-storage energy system, characterized in that, Power generation is achieved using the energy storage system described in any one of claims 1-6. Includes the following processes: Energy storage stage: The compressed air generated by the air compression assembly is introduced into the multi-stage interstage heat exchanger and exchanges heat with the heat exchange medium in the oil storage tank. The compressed air is then introduced into at least two air storage tanks through the air energy storage pipeline and the injection device, and at least one air storage tank is filled with compressed air; at the same time, the working fluid liquid in the liquid storage device is introduced into the liquid chamber. Energy release phase: including the first energy release condition and the second energy release condition; In the first energy release condition, compressed air is output from the gas storage tank to the gas chamber; the pressure in the liquid chamber is adjusted by the compressed air pressure in the gas chamber and the liquid level of the working fluid in the liquid chamber, and the working fluid in the liquid chamber is output to the hydro-generator to generate electricity; wherein the pressure in the gas chamber is adjusted by activating the cooling component and adjusting the capacity of the compressed air in the gas chamber.

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