Energy storage system and method for pumping water by using compressed air

Abstract

The energy storage system comprises an upper reservoir, a lower reservoir, a water storage reservoir, a water-air co-containing tank, an air storage tank and a first water pressing tank, the water-air co-containing tank is arranged below the water surface of the lower reservoir, the upper reservoir is communicated with the water-air co-containing tank, a water diversion pipeline is provided with a first valve, the water-air co-containing tank is communicated with the air storage tank, and the first water pressing tank is communicated with the water storage reservoir. The water inlet pipeline is provided with a third valve, the air storage tank is communicated with the first water pressing tank, the first air supply pipeline is provided with a fourth valve, the first water pressing tank is communicated with the water storage reservoir, the first lifting pipeline is provided with a fifth valve, and the water-air co-containing tank and / or the water diversion pipeline is communicated with the lower reservoir. The water inlet and outlet pipeline is provided with a sixth valve, the water-gas co-containing tank is communicated with a gas supplementing pipeline, and the gas supplementing pipeline is provided with a seventh valve. By means of the simple and ingenious structure, compressed air is generated through water energy of the upper reservoir, the generated compressed air is used for water lifting and energy storage, the energy utilization rate is effectively increased, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and in particular to an energy storage system and method for pumping water using compressed air. Background Art

[0002] Energy is the driving force of social development. With the increasing prominence of energy and environmental issues, renewable energy such as wind energy and solar energy have received more and more attention. However, the volatility and randomness of renewable energy and the insufficient peak-shaving capacity of the existing power grid have brought huge challenges to the development of renewable energy. As a transition system between power plants and power grids, energy storage systems can effectively solve the problem of renewable energy grid connection. Among the existing energy storage systems, pumped storage has been widely used. Traditional pumped storage uses the electrical energy generated during the low load period to convert it into mechanical energy to pump water to a high-level reservoir, and then releases water to the lower reservoir for power generation during the peak load period. Water energy is first used to generate electricity, converted into electrical energy, and then converted into mechanical energy of the water pump to pump water. The energy conversion rate is low and the cost is high. Summary of the invention

[0003] The main purpose of the present invention is to overcome the defects of the above-mentioned background technology and provide an energy storage system and method for pumping water using compressed air.

[0004] In order to achieve the above-mentioned purpose, the energy storage system using compressed air to pump water proposed in the present invention comprises an upper reservoir, a lower reservoir, a water storage reservoir, a water-gas co-containment tank, an air storage tank and a first pressurized water tank, wherein the water-gas co-containment tank is arranged under the water surface of the lower reservoir, the upper reservoir is connected with the water-gas co-containment tank through a water diversion pipeline, a first valve is arranged on the water diversion pipeline, an air outlet of the water-gas co-containment tank is connected with an air inlet of the air storage tank through an air storage pipeline, a second valve is arranged on the air storage pipeline, a water inlet of the first pressurized water tank is connected with the upper reservoir through a water inlet pipeline, and the water inlet of the first pressurized water tank is connected with the upper reservoir through a water inlet pipeline. A third valve is provided on the water pipeline, the air outlet of the gas storage tank is connected with the air inlet of the first water pressure tank through the first air supply pipeline, the fourth valve is provided on the first air supply pipeline, the water outlet of the first water pressure tank is connected with the water reservoir through the first lifting pipeline, the fifth valve is provided on the first lifting pipeline, the water-gas co-containment tank and / or the water diversion pipeline are provided with inlet and outlet water pipelines connected with the lower reservoir, the sixth valve is provided on the inlet and outlet water pipelines, the water-gas co-containment tank is connected with an air supply pipeline, and the seventh valve is provided on the air supply pipeline. When generating compressed air, by opening the first valve on the water diversion pipeline, the water from the upper reservoir flows to the gas in the water-gas co-container tank located in the lower reservoir to generate compressed air, and the compressed air generated after opening the second valve enters the gas storage tank for storage; when pumping water, open the third valve on the water inlet pipeline, and the water from the upper reservoir flows into the first pressure water tank to fill it up, and then close the third valve, open the fourth valve on the first air supply pipeline and the fifth valve on the first lifting pipeline, and the compressed air in the gas storage tank enters the first pressure water tank to pressurize the water in the first pressure water tank into the reservoir for water extraction. By converting water energy into compressed air and then using compressed air to pump water and store energy, energy loss can be effectively reduced.

[0005] To further optimize the technical solution, an air valve is provided on the water diversion pipeline to prevent water hammer from occurring in the water diversion pipeline.

[0006] To further optimize the technical solution, the water reservoir is connected to the water diversion pipeline or the water-gas co-container tank through a water discharge pipeline, and an eighth valve is provided on the water discharge pipeline. By opening the eighth valve, the water on the water reservoir can be used to generate compressed air, and the compressed air is used to pump water from the lower reservoir to the upper reservoir for use.

[0007] To further optimize the technical solution, the water-gas co-containment tank is provided with a pressure detection device, the first air supply pipeline is connected to a second air supply pipeline, the second air supply pipeline is connected to the pressure detection device, and the second air supply pipeline is provided with a ninth valve. The pressure in the water-gas co-containment tank is conveniently detected by the pressure detection device, and when the water-gas co-containment tank is filled with water, the compressed air in the air storage tank is back-pressed through the second air supply pipeline and the ninth valve to press the water in the water-gas co-containment tank out to the lower storage.

[0008] To further optimize the technical solution, the first pressure water tank is provided with a first pressure relief pipe, and the first pressure relief pipe is provided with a tenth valve. After the first pressure water tank has finished pressurizing water, the pressure is relieved through the first pressure relief pipe and the tenth valve to avoid unsmooth water inflow to the upper reservoir.

[0009] To further optimize the technical solution, the energy storage system for pumping water using compressed air proposed in the present invention also includes a second water pressure tank, the water inlet of the second water pressure tank is connected to the first lifting pipe, the water outlet of the second water pressure tank is connected to the water reservoir through the second lifting pipe, the second lifting pipe is provided with an eleventh valve, the second water pressure tank is provided with a second pressure relief pipe, the second pressure relief pipe is provided with a twelfth valve, the first air supply pipe is connected to a third air supply pipe, the third air supply pipe is connected to the air inlet of the second water pressure tank, and the third air supply pipe is provided with a thirteenth valve.

[0010] To further optimize the technical solution, the height difference between the upper reservoir and the water-gas co-containment tank is marked as H, the height difference between the first pressure water tank and the second pressure water tank is marked as H1, and the height difference between the second pressure water tank and the water reservoir is marked as H2, then H is greater than H1 and H2.

[0011] To further optimize the technical solution, liquid level switches are provided on the water-gas co-containment tank, the first pressure water tank and the second pressure water tank. The liquid level switch on the first pressure water tank is linked with the third valve, the fourth valve, the fifth valve and the tenth valve, the liquid level switch on the water-gas co-containment tank is linked with the first valve, the second valve, the sixth valve, the eighth valve and the ninth valve, and the liquid level switch on the second pressure water tank is linked with the eleventh valve, the twelfth valve and the thirteenth valve.

[0012] To further optimize the technical solution, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the tenth valve, the eleventh valve, the twelfth valve and the thirteenth valve are any one of stop valves, gate valves, ball valves and butterfly valves, and the ninth valve is a pressure regulating valve; the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve, the eleventh valve, the twelfth valve and the thirteenth valve are driven by any one of electric drive, pneumatic drive and hydraulic drive.

[0013] The present invention also proposes a method for storing energy by pumping water using compressed air, comprising the following steps: S1, producing compressed air, opening the first valve on the water diversion pipeline, the water in the upper reservoir flows along the water diversion pipeline to the water-gas co-containment tank located in the lower reservoir to compress the gas in the tank, generating compressed air, opening the second valve, the compressed air enters the gas storage tank and is stored for standby use; S2, storing energy by pumping water using compressed air, opening the third valve on the water inlet pipeline, the water in the upper reservoir flows into the first pressure water tank and fills it up, closing the third valve, then opening the fourth valve on the first air supply pipeline and the fifth valve on the first lifting pipeline, releasing part of the compressed air in the gas storage tank to enter the first pressure water tank to pressurize the water in the first pressure water tank into the second pressure water tank, closing the fifth valve, and opening the eleventh valve The doors and the thirteenth valve, the compressed air in the gas tank enters the second water pressure tank to press the water in the tank into the water reservoir for pumped storage; S3, the water reservoir releases energy. When the water level of the upper reservoir is lower than the water inlet of the water diversion pipeline, open the eighth valve on the water release pipeline, and flush the water stored in the water reservoir from a high place into the water-gas co-containment tank, compress the gas in the water-gas co-containment tank, generate compressed air and store it in the gas tank. After enough compressed air is generated, open the sixth valve and the first valve, and the water in the lower reservoir enters the water-gas co-containment tank. After it is full, close the sixth valve and open the ninth valve. The compressed air stored in the gas tank enters the water-gas co-containment tank after pressure regulation, and presses the water in the tank along the water diversion pipeline back to the upper reservoir, and the original generator set in the upper reservoir is used to generate electricity.

[0014] The beneficial effects of the present invention include: by opening the first valve on the water diversion pipeline, the water from the upper reservoir flows to the gas in the water-gas co-container tank located in the lower reservoir to compress the gas in the tank to generate compressed air, and the generated compressed air enters the gas storage tank for storage, and then the third valve on the water inlet pipeline is opened, the water from the upper reservoir flows into the first pressure water tank to fill it up, and then the third valve is closed, the fourth valve on the first air supply pipeline and the fifth valve on the first lifting pipeline are opened, and the compressed air in the gas storage tank is released into the first pressure water tank to pressurize the water in the first pressure water tank into the reservoir to pump water. Compared with the traditional pumped storage method, the present invention uses a simple and ingenious structure to use compressed air to pump water and store energy, which can effectively reduce energy loss, improve energy utilization, and has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall schematic diagram of an energy storage system that utilizes compressed air to pump water in an embodiment of the present invention.

[0016] Figure 2 Flow chart of the energy storage method using compressed air to pump water in an embodiment of the present invention.

[0017] Figure numerals: 1 upper reservoir; 2 lower reservoir; 3 water reservoir; 4 water-gas co-container tank; 5 gas storage tank; 6 first water pressure tank; 601 first pressure relief pipe; 602 tenth valve; 7 water diversion pipe; 701 first valve; 8 gas storage pipe; 801 second valve; 9 water inlet pipe; 901 third valve; 10 first gas supply pipe; 1001 fourth valve; 11 first lifting pipe; 1101 fifth valve; 12 water inlet and outlet pipes; 1201 sixth valve; 13 air supply pipe; 1301 seventh valve; 14 air valve; 15 water discharge pipe; 1501 eighth valve; 16 pressure detection device; 17 second gas supply pipe; 1701 ninth valve; 18 liquid level switch; 19 second water pressure tank; 1901 second pressure relief pipe; 1902 twelfth valve; 20 second lifting pipe; 2001 eleventh valve; 21 third gas supply pipe; 2101 thirteenth valve. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit connection.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] See also Figure 1In one embodiment, an energy storage system for pumping water using compressed air is disclosed, comprising an upper reservoir 1, a lower reservoir 2, a water reservoir 3, a water-gas co-containment tank 4, an air storage tank 5 and a first pressurized water tank 6. Specifically, the upper reservoir 1 is arranged upstream of a river channel, the lower reservoir 2 is arranged downstream of the river channel, the water reservoir 3 is arranged on a mountain top or a river ditch at a high place near the river channel, the water-gas co-containment tank 4 is arranged under the water surface of the lower reservoir 2, the upper reservoir 1 is connected with the water-gas co-containment tank 4 through a water diversion pipeline 7, a first valve 701 is arranged on the water diversion pipeline 7, the first valve 701 is used to control the water of the upper reservoir 1 to flow into the water-gas co-containment tank 4 to generate compressed air, the air outlet of the water-gas co-containment tank 4 is connected with the air inlet of the air storage tank 5 through an air storage pipeline 8, a second valve 801 is arranged on the air storage pipeline 8, the second valve 801 is used to control the compressed air generated in the water-gas co-containment tank 4 to enter the air storage tank 5, and the water inlet of the first pressurized water tank 6 is connected with the upper reservoir 1 through an inlet pipeline 9 A third valve 901 is provided on the water inlet pipe 9, and the horizontal position of the first pressure water tank 6 is lower than the horizontal plane of the upper reservoir 1. When the third valve 901 is opened, the water in the upper reservoir 1 can enter the first pressure water tank 6 through the water inlet pipe 9. The air outlet of the air storage tank 5 is connected with the air inlet of the first pressure water tank 6 through the first air supply pipe 10. A fourth valve 1001 is provided on the first air supply pipe 10. The water outlet of the first pressure water tank 6 is connected with the water reservoir 3 through the first lifting pipe 11. A fifth valve 1101 is provided on the first lifting pipe 11. An inlet and outlet water pipe 12 connected with the lower reservoir 2 is provided on the water-gas co-containing tank 4 and / or the water diversion pipe 7. A sixth valve 1201 is provided on the inlet and outlet water pipe 12. An air supply pipe 13 is connected to the water-gas co-containing tank 4. A seventh valve 1301 is provided on the air supply pipe 13. The air supply pipe 13 is connected with the external atmosphere or compressor.In this embodiment, in the initial state, the seventh valve 1301 on the air supply pipe 13 and the sixth valve 1201 on the water inlet and outlet pipes 12 are opened, and the external compressor is connected through the air supply pipe 13 to blow air into the water-gas co-containment tank 4 to press the water in the water-gas co-containment tank 4 out. After the water is pressed out, the sixth valve 1201 and the seventh valve 1301 are closed, and the first valve 701 on the water diversion pipe 7 is opened, and the water from the upper reservoir 1 flows into the water-gas co-containment tank 4 located in the lower reservoir 2 to compress the gas in the tank to generate compressed air. After the second valve 801 is opened, the compressed air generated enters the air storage tank 5 for storage, and the third valve 901 on the water inlet pipe 9 is opened, and the water from the upper reservoir 1 flows into the first water pressure tank 6 to fill it up, and then the third valve 901 is closed, and the fourth valve 1001 and The fifth valve 1101 on the first lifting pipeline 11 releases the compressed air in the gas tank 5 into the first pressure water tank 6, and presses the water in the first pressure water tank 6 into the water reservoir 3 to pump water. After completing one water pumping, there is still compressed air with a certain pressure in the gas tank 5. By adjusting and opening the second valve 801 and the sixth valve 1201, a small part of the compressed air in the gas tank 5 enters the water-gas co-containment tank 4 to press the water that entered the tank last time to the lower reservoir 2, and then the first valve 701 is repeatedly opened to re-introduce water to generate compressed air for water pumping. Compared with the traditional pumped storage method, this embodiment converts water energy into compressed air and then releases the compressed air for water pumping and energy storage, which effectively reduces energy loss and improves energy utilization. It also has a simple structure and low cost.

[0023] In a preferred embodiment, an air valve 14 is provided on the water diversion pipe 7, and the air valve 14 is used to prevent water hammer from occurring in the water diversion pipe 7 after the first valve 701 is closed instantaneously, causing the water diversion pipe 7 to vibrate, deform, and leak.

[0024] In a preferred embodiment, the water reservoir 3 is connected to the water diversion pipeline 7 or the water-gas co-containment tank 4 through a water discharge pipeline 15, and an eighth valve 1501 is provided on the water discharge pipeline 15. A pressure detection device 16 is provided on the water-gas co-containment tank 4. The pressure detection device 16 is used to detect the pressure in the water-gas co-containment tank 4. A second air supply pipeline 17 is connected to the first air supply pipeline 10, and the second air supply pipeline 17 is connected to the pressure detection device 16. A ninth valve 1701 is provided on the second air supply pipeline 17. When it is necessary to pressurize the water in the water-gas co-containment tank 4 to the lower reservoir 2 or the upper reservoir 1, the second valve 801 is closed, and the ninth valve 1701 is opened or closed. The compressed air stored in the air storage tank 5 enters the water-gas co-containment tank 4 via the second air supply pipeline 17 and the pressure detection device 16, so as to facilitate the adjustment of the pressure of the compressed air entering the water-gas co-containment tank 4 from the air storage tank 5. When the upper reservoir 1 is in the dry season and its water level is lower than the water inlet of the water diversion pipe 7, the water stored in the water reservoir 3 flows from the high place through the water diversion pipe 7 to the water-gas co-container tank 4 by opening the eighth valve 1501, or directly enters the water-gas co-container tank 4 to compress the gas in the water-gas co-container tank 4 to generate compressed air. The generated compressed air is used to lift the water in the lower reservoir 2 to the upper reservoir 1, and the existing power station is used for power generation, without adding a new power plant, thereby reducing production costs; when compressed air is generated, the eighth valve 1501 is opened, and the second valve 801 and the sixth valve 1201 are closed. The water from the reservoir 3 flows to the water-gas co-containment tank 4 located in the lower reservoir 2 to compress the gas in the tank to generate compressed air. The compressed air generated after opening the second valve 801 enters the gas storage tank 5 for storage. When drawing water, the sixth valve 1201 is opened, and the water from the lower reservoir 2 enters the water-gas co-containment tank 4 for filling. After filling, the sixth valve 1201 is closed, and the first valve 701 and the ninth valve 1701 are opened. The compressed air stored in the gas storage tank 5 enters the water-gas co-containment tank 4 after pressure adjustment to pressurize the water in the tank back to the upper reservoir 1 for use.

[0025] In a preferred embodiment, in a preferred embodiment, a first pressure relief pipe 601 is connected to the first pressure water tank 6, and a tenth valve 602 is provided at the first pressure relief pipe 601. The tenth valve 602 is connected to the external atmosphere. When the water in the first pressure water tank 6 is pressed onto the water reservoir 3, the first pressure water tank 6 is filled with compressed air. At this time, the pressure is released by opening the tenth valve 602 to ensure smooth re-intake of water into the first pressure water tank 6.

[0026] In a preferred embodiment, the energy storage system for pumping water using compressed air proposed by the present invention also includes a second pressure water tank 19, the water inlet of the second pressure water tank 19 is connected to the outlet of the first lifting pipe 11, the water outlet of the second pressure water tank 19 is connected to the 3 water reservoir through the second lifting pipe 20, the second lifting pipe 20 is provided with an eleventh valve 2001, the second pressure water tank 19 is provided with a second pressure relief pipe 1901, the second pressure relief pipe 1901 is provided with a twelfth valve 1902, the first air supply pipe 10 is connected to a third air supply pipe 21, the third air supply pipe 21 is connected to the air inlet of the second pressure water tank 19, and the third air supply pipe 21 is provided with a thirteenth valve 2101; the height difference between the upper reservoir 1 and the water-gas co-containing tank 4 is marked as H, the height difference between the first pressure water tank 6 and the second pressure water tank 19 is marked as H1, and the height difference between the second pressure water tank 19 and the water reservoir 3 is marked as H2, then H is greater than at H1 and H2; when the height difference of the site selection of the water storage reservoir 3 is greater than H, the first water pressure tank 6 cannot directly transport water to the water storage reservoir 3 through the first lifting pipe 11. At this time, a second water pressure tank 19 is added to the middle section of the first lifting pipe 11. The water in the first water pressure tank 6 is first pressed into the second water pressure tank 19 by compressed air, and then relayed from the second water pressure tank 19 to the water storage reservoir 3, ensuring that water lifting and energy storage can proceed smoothly; when the water in the first water pressure tank 6 is pressed into the second water pressure tank 19, the twelfth valve 1902 is opened and the thirteenth valve 2101 is closed. After the water in the second water pressure tank 19 is full, the eleventh valve 2001 and the thirteenth valve 2101 are opened, and the twelfth valve 1902 and the fifth valve 1101 are closed; at the same time, water is lifted by two-stage relay, so that the water in the upper reservoir 1 can be pumped to a higher position to obtain higher potential energy. When the subsequent water storage reservoir 3 releases water and releases energy, the water in the lower reservoir 2 can be pressed back to the upper reservoir 1.

[0027] In a preferred embodiment, a liquid level switch 18 is provided on the water-gas co-containment tank 4, the first pressure water tank 6 and the second pressure water tank 19. The liquid level switch 18 on the first pressure water tank 6 is linked with the third valve 901, the fourth valve 1001, the fifth valve 1101 and the tenth valve 602. The liquid level switch 18 on the water-gas co-containment tank 4 is linked with the first valve 701, the second valve 801, the sixth valve 1201, the eighth valve 1501 and the ninth valve 1701; the liquid level switch 18 on the second pressure water tank 19 is linked with the eleventh valve 2001, the twelfth valve 1902 and the thirteenth valve 2101. The liquid level in the water-gas co-containment tank 4, the first pressure water tank 6 and the second pressure water tank 19 is detected by the liquid level switch 18, and the liquid level signal is fed back to the controller (not shown), and the controller sends a control signal to control the action timing of each valve.

[0028] In a specific example, the first valve 701, the second valve 801, the third valve 901, the fourth valve 1001, the fifth valve 1101, the sixth valve 1201, the seventh valve 1301, the eighth valve 1501, the tenth valve 602, the eleventh valve 2001, the twelfth valve 1902 and the thirteenth valve 2101 are any one of stop valves, gate valves, ball valves and butterfly valves, the ninth valve 1701 is a pressure regulating valve, and the first valve 701, the second valve 801, the third valve 901, the fourth valve 1001, the fifth valve 1101, the sixth valve 1201, the seventh valve 1301, the eighth valve 1501, the ninth valve 1701, the tenth valve 602, the eleventh valve 2001, the twelfth valve 1902 and the thirteenth valve 2101 are driven by any one of electric drive, pneumatic drive and hydraulic drive.

[0029] See also Figure 1 and Figure 2 In one embodiment, a method for storing water by using compressed air to pump water is disclosed, using the above-mentioned energy storage system to store energy, and includes the following steps:

[0030] S1. Produce compressed air. Open the first valve 701 on the water diversion pipe 7. The water from the upper reservoir 1 flows along the water diversion pipe 7 to the water-gas co-container tank 4 located in the lower reservoir 2 to compress the gas in the tank and produce compressed air. Open the second valve 801 and the compressed air enters the gas storage tank 5 for storage and standby use. Close the first valve 701, open the second air supply pipe 1701 and the ninth valve 1701 and the sixth valve 1201 on the water inlet and outlet pipes 12. The compressed air in part of the gas storage tank 5 enters the water-gas co-container tank 4 after pressure adjustment. After the water pressure that produced compressed air last time is discharged from the tank, the first valve 701 is repeatedly opened to flush water into the water-gas co-container tank 4 again to produce compressed air continuously. When producing compressed air, the water-gas co-container tank 4 is preferably located at the flood limit water level of the lower reservoir 2 to increase the water head of the water from the upper reservoir 1 entering the water-gas co-container tank 4. S2, using compressed air to pump water for energy storage, open the third valve 901 on the water inlet pipe 9, the water from the upper reservoir 1 flows into the first pressure water tank 6 and fills it up, then close the third valve 901, then open the fourth valve 1001 on the first air supply pipe 10 and the fifth valve 1101 on the first lifting pipe 11, release part of the compressed air in the air storage tank 5 into the first pressure water tank 6 to press the water in the first pressure water tank 6 into the second pressure water tank 19, close the fifth valve 1101, open the eleventh valve 2001 on the second lifting pipe 20 and the third supply pipe 1101, and then ... The thirteenth valve 2101 on the air pipeline 21, the compressed air in the air storage tank 5 enters the second pressure water tank 19 to pressurize the water in the tank into the water reservoir 3 to perform pumped storage work; during pumped storage, the water level of the upper reservoir 1 is at a normal water level, the water level is higher than the water inlet of the water inlet pipe 9, and the horizontal position of the first pressure water tank 6 is lower than the normal water level, so that the water in the upper reservoir 1 can flow smoothly into the first pressure water tank 6, and by setting the first pressure water tank 6 and the second pressure water tank 19 for two-stage relay pumping, the water from the upper reservoir 1 can be pumped to a higher place to store a larger potential energy of water.S3, the water reservoir 3 releases energy. When the water level of the upper reservoir 1 is lower than the water inlet of the water diversion pipe 7, that is, the flood limit water level of the upper reservoir 1, the eighth valve 1501 on the water release pipe 15 is opened, and the water stored in the water reservoir 3 is flushed into the water-gas co-containment tank 4 from a high place, and the gas in the water-gas co-containment tank 4 is compressed to generate compressed air and store it in the gas storage tank 5. After sufficient compressed air is generated, the sixth valve 1201 and the first valve 701 are opened, and the water of the lower reservoir 2 enters the water-gas co-containment tank 4. After it is full, the sixth valve 1201 is closed, and the ninth valve 1701 is opened. The compressed air stored in the gas storage tank 5 enters the water-gas co-containment tank 4 after pressure regulation, and the water in the tank is pressed back to the upper reservoir 1 along the water diversion pipe 7, and the original generator set of the upper reservoir 1 is used to generate electricity. Compared with the traditional pumped storage method, the present invention is simple. The ingenious structure utilizes compressed air to pump water and store energy, which can effectively reduce energy loss, improve energy utilization, and has a low cost; when the water storage reservoir 3 releases energy, the water-gas co-containment tank 4 is preferably arranged at the normal water level of the lower reservoir 2 to reduce the height of pumping water from the lower reservoir 2 to the upper reservoir 1; taking the construction of the energy storage system of the present invention in the river channel between the Longtan Hydropower Station and the downstream Yantan Hydropower Station for energy storage as an example, the normal water level of the Longtan Hydropower Station is 375m, and the flood limit water level is 359m, the normal water storage level of Yantan is 223m, and the flood limit water level is 204m, the water storage reservoir 3 is arranged at 630 meters, and when the upper reservoir 1 releases water to produce compressed air, the water-gas co-containment tank 4 is arranged at the flood limit water level of Yantan in the lower reservoir 2, and when the water storage reservoir 3 releases energy to produce compressed air, the water-gas co-containment tank 4 is arranged at the normal water storage level of Yantan in the lower reservoir 2.

[0031] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description of reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. An energy storage system using compressed air to pump water, characterized in that: It includes an upper reservoir, a lower reservoir, a water storage reservoir, a water-gas co-containment tank, an air storage tank and a first pressure water tank. The water-gas co-containment tank is arranged under the water surface of the lower reservoir. The upper reservoir is connected with the water-gas co-containment tank through a water diversion pipeline. The water diversion pipeline is provided with a first valve. The air outlet of the water-gas co-containment tank is connected with the air inlet of the air storage tank through an air storage pipeline. The air storage pipeline is provided with a second valve. The water inlet of the first pressure water tank is connected with the upper reservoir through a water inlet pipeline. The water inlet pipeline is provided with a third valve. The air outlet of the air storage tank is connected with the air inlet of the first pressure water tank through a first air supply pipeline. The first air supply pipeline is provided with a fourth valve. The water outlet of the first pressure water tank is connected with the water storage reservoir through a first lifting pipeline. The first lifting pipeline is provided with a fifth valve. The water-gas co-containment tank and / or the water diversion pipeline are provided with water inlet and outlet pipelines connected with the lower reservoir. The water inlet and outlet pipelines are provided with a sixth valve. The water-gas co-containment tank is connected with an air supply pipeline. The air supply pipeline is provided with a seventh valve.

2. The energy storage system for pumping water using compressed air as claimed in claim 1, characterized in that: An air valve is arranged on the water diversion pipeline.

3. The energy storage system for pumping water using compressed air as claimed in claim 2, characterized in that: The water reservoir is connected with the water diversion pipeline or the water-gas co-container tank through a water discharge pipeline, and an eighth valve is provided on the water discharge pipeline.

4. The energy storage system for pumping water using compressed air as claimed in claim 3, characterized in that: The water-gas co-containment tank is provided with a pressure detection device, the first air supply pipeline is connected to a second air supply pipeline, the second air supply pipeline is connected to the pressure detection device, and the second air supply pipeline is provided with a ninth valve.

5. The energy storage system for pumping water using compressed air as claimed in claim 4, characterized in that: The first pressure water tank is provided with a first pressure relief pipe, and the first pressure relief pipe is provided with a tenth valve.

6. The energy storage system for pumping water using compressed air as claimed in claim 5, characterized in that: It also includes a second water pressure tank, the water inlet of the second water pressure tank is connected to the first lifting pipe, the water outlet of the second water pressure tank is connected to the water reservoir through the second lifting pipe, the second lifting pipe is provided with an eleventh valve, the second water pressure tank is provided with a second pressure relief pipe, the second pressure relief pipe is provided with a twelfth valve, the first air supply pipe is connected to a third air supply pipe, the third air supply pipe is connected to the air inlet of the second water pressure tank, and the third air supply pipe is provided with a thirteenth valve.

7. The energy storage system for pumping water using compressed air as claimed in claim 6, characterized in that: The height difference between the upper reservoir and the water-gas co-containment tank is marked as H, the height difference between the first pressure water tank and the second pressure water tank is marked as H1, and the height difference between the second pressure water tank and the water reservoir is marked as H2, then H is greater than H1 and H2.

8. The energy storage system for pumping water using compressed air as claimed in claim 7, characterized in that: The water-gas co-containment tank, the first pressure water tank and the second pressure water tank are all provided with liquid level switches. The liquid level switch located on the first pressure water tank is linked with the third valve, the fourth valve, the fifth valve and the tenth valve. The liquid level switch located on the water-gas co-containment tank is linked with the first valve, the second valve, the sixth valve, the eighth valve and the ninth valve. The liquid level switch located on the second pressure water tank is linked with the eleventh valve, the twelfth valve and the thirteenth valve.

9. The energy storage system for pumping water using compressed air as claimed in claim 8, characterized in that: The first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the tenth valve, the eleventh valve, the twelfth valve and the thirteenth valve are any one of stop valves, gate valves, ball valves and butterfly valves, and the ninth valve is a pressure regulating valve.

10. An energy storage method using compressed air to pump water, characterized in that: The energy storage system according to claims 1 to 9 is used to store energy, comprising the following steps: S1, produce compressed air, open the first valve on the water diversion pipeline, the water from the upper reservoir flows along the water diversion pipeline to the water-gas co-container tank in the lower reservoir to compress the gas in the tank, generate compressed air, open the second valve, and the compressed air enters the gas storage tank for storage; S2, using compressed air to pump water for energy storage, open the third valve on the water inlet pipe, let the water from the upper reservoir flow into the first pressure water tank to fill it up, close the third valve, then open the fourth valve on the first air supply pipe and the fifth valve on the first lifting pipe, release part of the compressed air in the air storage tank to enter the first pressure water tank to press the water in the first pressure water tank into the second pressure water tank, close the fifth valve, open the eleventh valve and the thirteenth valve, let the compressed air in the air storage tank enter the second pressure water tank to press the water in the tank into the reservoir, and perform pumped storage work; S3, the reservoir releases energy. When the water level of the upper reservoir is lower than the water inlet of the water diversion pipeline, open the eighth valve on the water release pipeline, flush the water stored in the reservoir into the water-gas co-container tank from a high place, compress the gas in the water-gas co-container tank, generate compressed air and store it in the gas storage tank. After generating enough compressed air, open the sixth valve and the first valve, and the water from the lower reservoir enters the water-gas co-container tank. When it is full, close the sixth valve and open the ninth valve. The compressed air stored in the gas storage tank enters the water-gas co-container tank after pressure regulation, and presses the water in the tank back to the upper reservoir along the water diversion pipeline, and uses the original generator set in the upper reservoir to generate electricity.

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