A hydraulic compressed air energy storage device system

Abstract

This invention provides a hydraulic compressed air energy storage system. A heat exchange device is installed between the first and second air-water tanks in the system. An air compressor, an expansion device, and a gas buffer tank are each connected to one end of a pressure pipeline via branch pipes. The inlet and outlet of the energy storage pump are connected to the bottoms of the first and second air-water tanks via pipelines. The inlet and outlet of the power generation device are connected to the inlet and outlet of the energy storage pump via pipelines. The outlet of the air storage tank is connected to the top of the first and second air-water tanks via pipelines. This invention uses an air compressor and expansion device to reduce the system's water consumption and the number of pumps required, as well as the system's water storage capacity and the number of air-water tanks. The combined configuration of the power generation device and the expansion device allows for power generation from air below 0.5 MPa via an air turbine, improving overall efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field and relates to a hydraulic compressed air energy storage device system. Background Technology

[0002] Currently, the main energy storage technologies include battery storage, compressed air storage, and pumped hydro storage. Battery storage offers flexibility in scale and primarily stores electrical energy. Compressed air storage converts electrical energy into mechanical energy, while pumped hydro storage utilizes gravity for energy storage. All of these technologies have their own applications. Among them, hydraulic compressed air storage systems, as an innovative energy storage and utilization method, can stably output electricity and features large capacity, long lifespan, safety, and environmental friendliness. It is one of the key technologies for the rapid development of energy storage and improving energy security.

[0003] The existing technical solution discloses a composite hydropower generation and air compression energy storage system, including an air compressor, a hydro generator and a transformer. The air compressor is equipped with a pressure gauge, the air compressor is connected to a water container, the water container is connected to the hydro generator, the hydro generator is connected to the transformer, the transformer is connected to the national power grid, the hydro generator is connected to a circulating water container, the circulating water container is connected to a circulating water pump, one end of the circulating water pump is connected to the water container, and the other end of the circulating water pump is connected to the air compressor.

[0004] The existing technical solution discloses a pressure-graded jacketed heat exchanger hydraulic compressed air energy storage system, including at least one first jacketed heat exchanger and multiple second jacketed heat exchangers; the first jacket of the first jacketed heat exchanger and the second jacket of the second jacketed heat exchangers are both connected to a water storage tank via a first water pump; the first internal reactor of the first jacketed heat exchanger stores compressed air, and the second internal reactor of the second jacketed heat exchanger stores air and water; the first internal reactor of the first jacketed heat exchanger is connected to the second internal reactor of the second jacketed heat exchanger; the second internal reactors of the multiple second jacketed heat exchangers are interconnected and have different pressure levels; the inlet of each second internal reactor is connected to a second water pump, and the outlet is connected to a water turbine; the second water pump and the water turbine are respectively connected to the water storage tank.

[0005] However, existing hydraulic compressed air energy storage systems suffer from drawbacks such as large required pressure space volume, high water demand, and a large number of pressure tanks, increasing energy storage costs. Therefore, there is an urgent need to design a hydraulic compressed air energy storage system to overcome the shortcomings of existing technologies and meet practical application requirements. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a hydraulic compressed air energy storage device system. This invention employs an air compressor and expansion device to reduce the system's water consumption and pump requirements. Multiple air-water tanks are used for reciprocating injection, enabling the system to have a piston-like compression and energy release process even with a small water volume, thus reducing the system's water storage capacity and the number of air-water tanks. The combined configuration of the power generation device and expansion device allows for power generation from air below 0.5 MPa via an air turbine, improving overall efficiency. Furthermore, multiple systems can be connected in series, using the pressure in the storage tank of the preceding system as the pre-pressure for the following system, achieving a step-by-step pressure increase.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] This utility model provides a hydraulic compressed air energy storage device system, which includes an air compressor, an expansion device, a gas buffer tank, a power generation device, an energy storage water pump, a gas storage tank, a heat exchange device, and at least two gas-water tanks.

[0009] The at least two gas-water tanks include a first gas-water tank and a second gas-water tank, and the heat exchange device is provided between the first gas-water tank and the second gas-water tank. The heat exchange device is used to exchange the heat between the first gas-water tank and the second gas-water tank.

[0010] The air compressor, the expansion device, and the gas buffer tank are each connected to one end of the pressure pipeline via branch pipes. The other end of the pressure pipeline is connected to the top of the first gas-water tank and the top of the second gas-water tank, respectively. The inlet and outlet of the energy storage water pump are connected to the bottom of the first gas-water tank and the bottom of the second gas-water tank, respectively, via pipelines.

[0011] The inlet and outlet of the power generation device are respectively connected to the inlet and outlet of the energy storage water pump via pipelines.

[0012] The gas outlet of the gas storage tank is connected to the top of the first gas-water tank and the top of the second gas-water tank via pipelines.

[0013] In this invention, the use of air compression and expansion devices reduces the system's water consumption and the configuration of water pumps. By using multiple air-water tanks for reciprocating injection, the system can achieve a piston-like compression and energy release process under the premise of small water volume, thereby reducing the system's water storage capacity and the number of air-water tanks. The combination of the power generation device and the expansion device can generate electricity through an air turbine with air pressure below 0.5MPa, improving the overall efficiency. Multiple systems can also be connected in series, with the pressure in the air storage tank of the previous system used as the pre-pressure of the next system, achieving a step-by-step increase in pressure.

[0014] As a preferred technical solution of this utility model, the heat exchange device includes a first heat exchanger and a second heat exchanger connected in a loop.

[0015] Furthermore, the end of the first heat exchanger furthest from the second heat exchanger is connected to the top of the first gas-water tank.

[0016] Furthermore, the end of the second heat exchanger furthest from the first heat exchanger is connected to the top of the second gas-water tank.

[0017] As a preferred technical solution of this utility model, the end of the first heat exchanger away from the second heat exchanger is also connected to the outlet end of the first water pump, and the inlet end of the first water pump is connected to the bottom of the first gas-water tank.

[0018] Furthermore, the end of the second heat exchanger furthest from the first heat exchanger is also connected to the outlet of the second water pump, and the inlet of the second water pump is connected to the bottom of the second gas-water tank.

[0019] As a preferred technical solution of this utility model, a first spray device is provided on the inner top of the first gas-water tank.

[0020] As a preferred technical solution of this utility model, a second spray device is provided on the inner top of the second gas-water tank.

[0021] As a preferred technical solution of this utility model, the other end of the pressure pipe is connected to the first spray device and the second spray device respectively.

[0022] Furthermore, a first regulating valve is provided on the pipeline connecting the pressure pipeline to the first spray device.

[0023] Furthermore, a second regulating valve is provided on the pipeline connecting the pressure pipeline to the second spray device.

[0024] As a preferred technical solution of this utility model, the bottom of the first gas-water tank and the bottom of the second gas-water tank are connected through a first conveying pipeline and a second conveying pipeline, and the first conveying pipeline and the second conveying pipeline are connected in parallel.

[0025] Furthermore, a third regulating valve and a fourth regulating valve are provided on the first delivery pipeline.

[0026] Furthermore, a fifth regulating valve and a sixth regulating valve are provided on the second delivery pipeline.

[0027] As a preferred technical solution of this utility model, the inlet end and outlet end of the energy storage water pump are respectively connected to an inlet pipe and an outlet pipe, the inlet end of the inlet pipe is connected to the first conveying pipe, and the outlet end of the outlet pipe is connected to the second conveying pipe.

[0028] Furthermore, a seventh regulating valve is installed on the water inlet pipe, and an eighth regulating valve is installed on the water outlet pipe.

[0029] As a preferred technical solution of this utility model, the water inlet end and the water outlet end of the power generation device are respectively connected to a water inlet pipe and a water outlet pipe, the water inlet end of the water inlet pipe is connected to the water inlet pipeline, and the water outlet end of the water outlet pipe is connected to the water outlet pipeline.

[0030] Furthermore, a ninth regulating valve is installed on the water inlet pipe, and a tenth regulating valve is installed on the water outlet pipe.

[0031] As a preferred technical solution of this utility model, an eleventh regulating valve is provided on the pipeline connecting the gas outlet of the gas storage tank and the first gas-water tank.

[0032] Furthermore, a twelfth regulating valve is provided on the pipeline connecting the gas outlet of the gas storage tank and the second gas-water tank.

[0033] The system refers to an equipment system, device system, or production device.

[0034] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0035] In this invention, the use of air compression and expansion devices reduces the system's water consumption and the configuration of water pumps. By using multiple air-water tanks for reciprocating injection, the system can achieve a piston-like compression and energy release process under the premise of small water volume, thereby reducing the system's water storage capacity and the number of air-water tanks. The combination of the power generation device and the expansion device can generate electricity through an air turbine with air pressure below 0.5MPa, improving the overall efficiency. Multiple systems can also be connected in series, with the pressure in the air storage tank of the previous system used as the pre-pressure of the next system, achieving a step-by-step increase in pressure. Attached Figure Description

[0036] Figure 1 A schematic diagram of the structure of a hydraulic compressed air energy storage device system provided for a specific embodiment of this utility model;

[0037] Among them, 1-air compressor; 2-expansion device; 3-gas buffer tank; 4-first gas-water tank; 5-second gas-water tank; 6-power generation device; 7-energy storage water pump; 8-gas storage tank; 9-first heat exchanger; 10-second heat exchanger; 11-first spray device; 12-second spray device;

[0038] K0 - Control valve; K1 - First control valve; K2 - Eleventh control valve; K3 - Second control valve; K4 - Twelfth control valve; K5 - Third control valve; K6 - Fourth control valve; K7 - Fifth control valve; K8 - Sixth control valve; K9 - Seventh control valve; K10 - Eighth control valve; K11 - Ninth control valve; K12 - Tenth control valve; K13 - Control valve; K14 - Control valve; K15 - Control valve. Detailed Implementation

[0039] It should be understood that in the description of this utility model, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] In one embodiment, the present invention provides an energy storage device system for hydraulically compressed air, such as... Figure 1 As shown, the energy storage system includes an air compressor 1, an expansion device 2, a gas buffer tank 3, a power generation device 6, an energy storage water pump 7, a gas storage tank 8, a heat exchange device, and at least two gas-water tanks.

[0043] At least two gas-water tanks include a first gas-water tank 4 and a second gas-water tank 5. A heat exchange device is provided between the first gas-water tank 4 and the second gas-water tank 5. The heat exchange device is used to exchange the heat between the first gas-water tank 4 and the second gas-water tank 5.

[0044] The air compressor 1, the expansion device 2 and the gas buffer tank 3 are respectively connected to one end of the pressure pipeline through branch pipelines. The other end of the pressure pipeline is respectively connected to the top of the first gas-water tank 4 and the top of the second gas-water tank 5. The inlet and outlet of the energy storage water pump 7 are respectively connected to the bottom of the first gas-water tank 4 and the bottom of the second gas-water tank 5 through pipelines.

[0045] The inlet and outlet of the power generation device 6 are connected to the inlet and outlet of the energy storage water pump 7 respectively via pipelines.

[0046] The gas outlet of the gas storage tank 8 is connected to the top of the first gas-water tank 4 and the top of the second gas-water tank 5 via pipelines.

[0047] It should be noted that before energy storage, the first gas-water tank 4 needs to be fully loaded with water and the second gas-water tank 5 needs to be fully loaded with gas. The device system of this utility model adopts a pre-pressurized water and gas storage method. Multiple gas-water tanks are connected in combination and pipeline switching is used to realize that a single pump can achieve water circulation in multiple gas-water tanks. Heat exchange devices are set between the gas-water tanks to utilize external heat and cold synergy to maximize efficiency. Moreover, it is not limited to a single energy storage device system, but can realize multiple systems in series to achieve a stepped pressurization process.

[0048] It should be noted that this utility model provides air pre-compression to raise the initial pressure of the system from atmospheric pressure to 0.5 MPa or above, thereby minimizing the water consumption and equipment input required for hydraulic compression to raise the pressure from atmospheric pressure to this level. At least two air-water tanks can be set up, divided into two groups: one group is full of water, and the other group is full of pre-compressed air. These tanks are connected to the air storage tank 8, water turbine, energy storage pump 7, gas buffer tank 3, etc., through switching valves and pipelines. When storing energy, pre-compressed air is supplied to the system, the water pump operates, and the water in the first air-water tank 4 is injected into the second air-water tank 5. The air in the second air-water tank 5 can be compressed into the air storage tank 8. After the water in the first air-water tank 4 is emptied, the first air-water tank 4 is replenished with air at the pre-compressed value, and then the valve is switched, and water is injected from the second air-water tank 5 into the first air-water tank 4. The air in the first air-water tank 4 is compressed into the air storage tank 8. This cycle continues until the pressure in the air storage tank 8 reaches the set value, completing the energy storage. During energy release, the compressed air in the gas storage tank 8 expands and pushes water from the second gas-water tank 5 to the first gas-water tank 4. The water drives the water turbine to generate electricity. The air in the unloaded gas-water tank hits the expansion device 2 to generate electricity. The two sets of gas-water tanks operate repeatedly until the pressure in the gas storage tank 8 drops to the system's preset pressure of 0.5MPa, and the energy release is completed.

[0049] It should be noted that this utility model uses two air-water tanks or more small-capacity tanks to circulate water via a piston, which reduces the system's water volume and the amount of air-water tanks, saves investment, reduces the floor space, and allows the expansion and compression functions of multiple air-water tanks to be performed simultaneously. A heat exchange system is set up between the compression and expansion cylinders to achieve a near-constant temperature working process. Multiple air-water tanks can achieve stable fluctuations in electricity and hydraulic power for projects of the same scale.

[0050] It should be noted that the gas-water tank in this utility model can be a pressure vessel used to store, separate and regulate gas and liquid (usually water and air), which can balance system pressure, reduce frequent start and stop of water pumps, eliminate water hammer effect and improve system efficiency. Specifically, it can be a pressure stabilizing tank, a hydraulic compression cylinder using water-gas mixing or a compressed air expansion cylinder.

[0051] It should be noted that the air compressor device 1 in this utility model can be an air compressor, a high-pressure blower or a compressor. High-pressure air can be injected into the air-water tank in advance to keep the air-water tank in a fully loaded state. This can reduce the system's water consumption and the number of water pumps required, solve the problem of hydraulic compressed air energy storage power, and save on high-frequency compression equipment in the low-pressure range.

[0052] It should be noted that the expansion device 2 in this utility model is a device that converts the energy of high-pressure gas or liquid into mechanical work or electrical energy. Its core principle is to use the pressure energy of fluid (gas or liquid) expansion to drive the rotor or piston to do work, similar to a "reverse compressor". Specifically, a turbine expander can be selected, that is, high-pressure gas is accelerated through the nozzle, impacts the impeller to rotate, and drives the generator or compressor.

[0053] It should be noted that in this utility model, the water inlet and water outlet of the power generation device 6 are respectively connected to the water inlet and water outlet of the energy storage water pump 7 through pipelines. The water inlet can be located on the water inlet pipeline near the water inlet of the energy storage water pump 7, and the water outlet can be located on the water outlet pipeline near the water outlet of the energy storage water pump 7.

[0054] It should be noted that the gas buffer tank 3 in this utility model can be used as a pressure vessel to stabilize gas pressure, eliminate pulsation, and store buffer gas. It can smooth airflow fluctuations, protect downstream equipment, and improve system stability and energy efficiency. It can be a compressed air buffer tank, a process gas buffer tank 3, or a vacuum buffer tank.

[0055] In one embodiment, the heat exchange device includes a first heat exchanger 9 and a second heat exchanger 10 connected in a loop.

[0056] In one embodiment, the end of the first heat exchanger 9 away from the second heat exchanger 10 is connected to the top of the first gas-water tank 4.

[0057] In one embodiment, the end of the second heat exchanger 10 away from the first heat exchanger 9 is connected to the top of the second gas-water tank 5.

[0058] This invention utilizes the first heat exchanger 9 and the second heat exchanger 10 to introduce external waste heat, which is then released into the gas-water tank to heat the expanding air, thereby realizing the utilization of waste heat. At the same time, the external air temperature can be adjusted.

[0059] In one embodiment, the end of the first heat exchanger 9 away from the second heat exchanger 10 is also connected to the outlet of the first water pump, and the inlet of the first water pump is connected to the bottom of the first gas-water tank 4.

[0060] In one embodiment, the end of the second heat exchanger 10 furthest from the first heat exchanger 9 is also connected to the outlet of the second water pump, and the inlet of the second water pump is connected to the bottom of the second gas-water tank 5.

[0061] It should be noted that the present invention does not impose any special limitations on the specific models, structures, etc. of the first and second water pumps. The first and second water pumps can be the same or different, and those skilled in the art can make an adaptive selection according to the actual situation.

[0062] In one embodiment, a first spray device 11 is provided on the inner top of the first gas-water tank 4.

[0063] In one embodiment, a second spray device 12 is provided on the inner top of the second gas-water tank 5.

[0064] It should be noted that this utility model does not impose any special limitations on the specific model, structure, etc. of the first spray device 11 and the second spray device 12. The first spray device 11 and the second spray device 12 can be the same or different, and those skilled in the art can make an adaptive selection according to the actual situation. The arrangement of the first spray device 11 and the second spray device 12 can enable the system to achieve a sufficient heat exchange effect.

[0065] In one embodiment, the other end of the pressure pipe is connected to the first spray device 11 and the second spray device 12, respectively.

[0066] In one embodiment, a first regulating valve is provided on the pipeline connecting the pressure pipeline to the first spray device 11.

[0067] In one embodiment, a second regulating valve is provided on the pipeline connecting the pressure pipeline to the second spray device 12.

[0068] In one embodiment, the bottom of the first gas-water tank 4 and the bottom of the second gas-water tank 5 are connected through a first delivery pipeline and a second delivery pipeline, and the first delivery pipeline and the second delivery pipeline are connected in parallel.

[0069] In one embodiment, a third regulating valve and a fourth regulating valve are provided on the first delivery pipeline.

[0070] In one embodiment, a fifth regulating valve and a sixth regulating valve are provided on the second delivery pipeline.

[0071] In one embodiment, the inlet and outlet ends of the energy storage pump 7 are respectively connected to an inlet pipe and an outlet pipe. The inlet end of the inlet pipe is connected to the first conveying pipe, and the outlet end of the outlet pipe is connected to the second conveying pipe.

[0072] In one embodiment, a seventh regulating valve is provided on the inlet pipe and an eighth regulating valve is provided on the outlet pipe.

[0073] In one embodiment, the water inlet and outlet of the power generation device 6 are respectively connected to an inlet pipe and an outlet pipe, with the inlet end of the inlet pipe connected to the inlet pipeline and the outlet end of the outlet pipe connected to the outlet pipeline.

[0074] It should be noted that the power generation device 6 in this utility model can be a water turbine, and there is no special limitation on the specific model of the water turbine. Those skilled in the art can adapt it according to the actual situation. In particular, this utility model uses water as the work carrier to drive the water turbine to generate electricity, which greatly improves the power generation efficiency.

[0075] In one embodiment, a ninth regulating valve is provided on the inlet pipe, and a tenth regulating valve is provided on the outlet pipe.

[0076] In one embodiment, an eleventh regulating valve is provided on the pipeline connecting the gas outlet of the gas storage tank 8 and the first gas-water tank 4.

[0077] In one embodiment, a twelfth regulating valve is provided on the pipeline connecting the gas outlet of the gas storage tank 8 and the second gas-water tank 5.

[0078] It should be noted that this utility model does not impose any special limitations on the specific model, structure, etc. of each regulating valve. The regulating valves can be the same or different, and those skilled in the art can make adaptive selections according to the actual situation.

[0079] It should be noted that the energy storage device system of this utility model is also equipped with necessary connecting pipelines and switch control valves. This utility model does not make any special limitations on these. Those skilled in the art should reasonably adjust, add or delete them according to actual production needs. It should be clarified that new technical solutions generated by deleting some unnecessary connecting pipelines and switch control valves, or replacing single-function switch control valves with multi-function integrated control valves, or using external automatic control systems electrically connected to the switch control valves to control the opening of the corresponding valves, etc., which are common and well-known technical means by those skilled in the art, also fall within the scope of disclosure and protection of this utility model.

[0080] Example 1

[0081] This embodiment provides a hydraulic compressed air energy storage device system, wherein:

[0082] The energy storage system includes an air compressor 1, an expansion unit 2, a gas buffer tank 3, a power generation unit 6, an energy storage water pump 7, a gas storage tank 8, a heat exchange device, and two gas-water tanks. The two gas-water tanks include a first gas-water tank 4 and a second gas-water tank 5. A heat exchange device is installed between the first gas-water tank 4 and the second gas-water tank 5 to exchange heat between them. The air compressor 1, the expansion unit 2, and the gas buffer tank 3 are each connected to one end of a pressure pipeline via branch pipes. The other end of the pressure pipeline is connected to the top of the first gas-water tank 4 and the top of the second gas-water tank 5, respectively. The inlet and outlet of the energy storage water pump 7 are connected to the bottom of the first gas-water tank 4 and the bottom of the second gas-water tank 5, respectively, via pipelines. The inlet and outlet of the power generation unit 6 are connected to the inlet and outlet of the energy storage water pump 7, respectively, via pipelines. The outlet of the gas storage tank 8 is connected to the top of the first gas-water tank 4 and the top of the second gas-water tank 5, respectively, via pipelines.

[0083] The heat exchange device includes a first heat exchanger 9 and a second heat exchanger 10 connected in a loop. The end of the first heat exchanger 9 away from the second heat exchanger 10 is connected to the top of the first gas-water tank 4, and the end of the second heat exchanger 10 away from the first heat exchanger 9 is connected to the top of the second gas-water tank 5. The end of the first heat exchanger 9 away from the second heat exchanger 10 is also connected to the outlet of the first water pump, and the inlet of the first water pump is connected to the bottom of the first gas-water tank 4. The end of the second heat exchanger 10 away from the first heat exchanger 9 is also connected to the outlet of the second water pump, and the inlet of the second water pump is connected to the bottom of the second gas-water tank 5.

[0084] The first gas-water tank 4 is equipped with a first spray device 11 at its inner top, and the second gas-water tank 5 is equipped with a second spray device 12 at its inner top. The other end of the pressure pipe is connected to the first spray device 11 and the second spray device 12 respectively. A first regulating valve is installed on the pipe connecting the pressure pipe to the first spray device 11, and a second regulating valve is installed on the pipe connecting the pressure pipe to the second spray device 12.

[0085] The bottom of the first gas-water tank 4 and the bottom of the second gas-water tank 5 are connected through the first delivery pipeline and the second delivery pipeline. The first delivery pipeline and the second delivery pipeline are connected in parallel. The first delivery pipeline is equipped with a third regulating valve and a fourth regulating valve, and the second delivery pipeline is equipped with a fifth regulating valve and a sixth regulating valve.

[0086] The inlet and outlet ends of the energy storage water pump 7 are respectively connected to an inlet pipe and an outlet pipe. The inlet end of the inlet pipe is connected to the first conveying pipe, and the outlet end of the outlet pipe is connected to the second conveying pipe. A seventh regulating valve is installed on the inlet pipe, and an eighth regulating valve is installed on the outlet pipe.

[0087] The inlet and outlet ends of the power generation device 6 are respectively connected to an inlet pipe and an outlet pipe. The inlet end of the inlet pipe is connected to the inlet pipeline, and the outlet end of the outlet pipe is connected to the outlet pipeline. A ninth regulating valve is installed on the inlet pipe, and a tenth regulating valve is installed on the outlet pipe.

[0088] An eleventh regulating valve is installed on the pipeline connecting the gas outlet of the gas storage tank 8 and the first gas-water tank 4, and a twelfth regulating valve is installed on the pipeline connecting the gas outlet of the gas storage tank 8 and the second gas-water tank 5.

[0089] The working principle of the hydraulic compressed air energy storage device system provided in this embodiment includes:

[0090] When the system stores energy:

[0091] Turn on the air compressor 1, with all valves closed, and then turn on the air compressor 1, regulating valve K0, regulating valve K15, regulating valve K13 and regulating valve K14 in sequence.

[0092] First, fill the first air-water tank 4 with water and the second air-water tank 5 with air. At this time, open the first regulating valve K1, the third regulating valve K5, the sixth regulating valve K8, the seventh regulating valve K9, and the eighth regulating valve K10, and start the energy storage pump 7. The water in the first air-water tank 4 enters the second air-water tank 5 through the energy storage pump 7, compressing the air in the second air-water tank 5; at the same time, under the action of the air compressor 1, air enters the first air-water tank 4 (at a pressure of 1 MPa).

[0093] The second water pump is turned on. In the second gas-water tank 5, the heat generated by gas compression is removed through the second heat exchanger 10. The second spray device 12 is set up to ensure sufficient heat exchange in the second gas-water tank 5. When the air pressure in the second gas-water tank 5 is equal to the gas pressure in the gas storage tank 8, the twelfth regulating valve K4 is opened to continue operation, and compressed gas enters the gas storage tank 8. When the water volume in the second gas-water tank 5 reaches the upper limit, the twelfth regulating valve K4 is closed, and the second water pump is turned off.

[0094] Close the first regulating valve K1, the third regulating valve K5, the sixth regulating valve K8, and the eleventh regulating valve K2; open the second regulating valve K3, the fourth regulating valve K6, and the fifth regulating valve K7. Water in the second air-water tank 5 enters the first air-water tank 4 through the first water pump, compressing the air in the first air-water tank 4. At the same time, air enters the second air-water tank 5 under the action of the air compressor 1. The first water pump is turned on, and the heat generated by the gas compression in the first air-water tank 4 is removed through the first heat exchanger 9. The first spray device 11 is set in the first air-water tank 4 to ensure sufficient heat exchange.

[0095] When the air pressure in the first gas-water tank 4 equals the gas pressure in the gas storage tank 8, the eleventh regulating valve K2 is opened to continue working, and compressed gas enters the gas storage tank 8. When the working medium in the first gas-water tank 4 reaches its upper limit, the eleventh regulating valve K2 is closed, the first water pump is turned off, and the next cycle continues.

[0096] When more than two gas-water tanks are connected in series, the gas storage tank 8 in the first system serves as the gas buffer tank 3 in the second system. The energy storage pressure in the first system provides pre-pressure for the second system, and then the pressure is increased based on this.

[0097] When the system releases energy:

[0098] With all valves closed, the first air-water tank 4 is filled with water, and the second air-water tank 5 is filled with air (pressure 1 MPa).

[0099] Open the third regulating valve K5, the sixth regulating valve K8, the ninth regulating valve K11, and the tenth regulating valve K12. Start the generator 6; open the regulating valves K13, K2, K3, K14, and K15, and start the expander. Air in the gas storage tank 8 enters the first gas-water tank 4. Under the action of air pressure, it pushes the working fluid from the first gas-water tank 4 into the second gas-water tank 5. At the same time, the generator 6 works, and the air in the second gas-water tank 5 does work through the expander 2.

[0100] The first water pump is turned on, and the cooling energy generated by the gas expansion in the first gas-water tank 4 is removed by the first heat exchanger 9. When the liquid level in the first gas-water tank 4 reaches the preset value, the eleventh regulating valve K2 is closed, and the gas continues to expand and do work. When the working fluid in the second gas-water tank 5 reaches the upper limit, the second regulating valve K3 is closed and the first water pump is turned off.

[0101] Close the eleventh regulating valve K2, the second regulating valve K3, the third regulating valve K5, and the sixth regulating valve K8. Open the fourth regulating valve K6, the fifth regulating valve K7, the twelfth regulating valve K4, and the first regulating valve K1. Air in the gas storage tank 8 enters the second gas-water tank 5. Under the action of air pressure, it pushes the working medium from the second gas-water tank 5 into the first gas-water tank 4. At the same time, the power generation device 6 works, and the air in the first gas-water tank 4A works through the expansion device 2.

[0102] The second water pump is turned on, and the cooling energy generated by gas expansion in the second gas-water tank 5 is removed by the second heat exchanger 10. When the liquid level in the second gas-water tank 5 reaches the preset value, the twelfth regulating valve K4 is closed, and the gas continues to expand and do work. When the working fluid in the first gas-water tank 4 reaches its upper limit, the first regulating valve K1 is closed, and the second water pump is turned off. The next cycle begins.

[0103] In summary, this utility model uses an air compressor and expansion device 2 to reduce the system's water consumption and pump configuration. By using multiple air-water tanks for reciprocating injection, it achieves a piston-like compression and energy release process in the system under the premise of small water volume, thereby reducing the system's water storage capacity and the number of air-water tanks. The power generation device 6 and expansion device 2 are combined to generate electricity from air below 0.5MPa through an air turbine, improving the overall efficiency. Multiple systems can also be connected in series, with the pressure in the air storage tank 8 of the previous system used as the pre-pressure of the next system, achieving a step-by-step increase in pressure.

[0104] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A system for a water powered compressed air energy storage device, characterized by, The energy storage system includes an air compressor, an expansion device, a gas buffer tank, a power generation device, an energy storage water pump, a gas storage tank, a heat exchange device, and at least two gas-water tanks. The at least two gas-water tanks include a first gas-water tank and a second gas-water tank, and the heat exchange device is provided between the first gas-water tank and the second gas-water tank. The heat exchange device is used to exchange the heat between the first gas-water tank and the second gas-water tank. The air compressor, the expansion device, and the gas buffer tank are each connected to one end of the pressure pipeline via branch pipes. The other end of the pressure pipeline is connected to the top of the first gas-water tank and the top of the second gas-water tank, respectively. The inlet and outlet of the energy storage water pump are connected to the bottom of the first gas-water tank and the bottom of the second gas-water tank, respectively, via pipelines. The inlet and outlet of the power generation device are respectively connected to the inlet and outlet of the energy storage water pump via pipelines. The gas outlet of the gas storage tank is connected to the top of the first gas-water tank and the top of the second gas-water tank via pipelines.

2. The system of claim 1, wherein, The heat exchange device includes a first heat exchanger and a second heat exchanger connected in a loop. The end of the first heat exchanger furthest from the second heat exchanger is connected to the top of the first gas-water tank; The end of the second heat exchanger furthest from the first heat exchanger is connected to the top of the second gas-water tank.

3. The hydraulic compressed air energy storage system of claim 2, wherein, The end of the first heat exchanger furthest from the second heat exchanger is also connected to the outlet of the first water pump, and the inlet of the first water pump is connected to the bottom of the first gas-water tank. The end of the second heat exchanger furthest from the first heat exchanger is also connected to the outlet of the second water pump, and the inlet of the second water pump is connected to the bottom of the second gas-water tank.

4. The hydraulic compressed air energy storage system of claim 1, wherein, The first gas-water tank is equipped with a first spray device at its inner top.

5. The hydraulic compressed air energy storage system of claim 4, wherein, A second spray device is provided on the top of the second gas-water tank.

6. The hydro-compressed air energy storage system of claim 5, wherein, The other end of the pressure pipe is connected to the first spray device and the second spray device, respectively; A first regulating valve is installed on the pressure pipeline connecting to the first spray device. A second regulating valve is installed on the pipeline connecting the pressure pipeline to the second spray device.

7. The hydraulic compressed air energy storage system of claim 1, wherein, The bottom of the first gas-water tank and the bottom of the second gas-water tank are connected through a first delivery pipeline and a second delivery pipeline, and the first delivery pipeline and the second delivery pipeline are connected in parallel. The first delivery pipeline is equipped with a third regulating valve and a fourth regulating valve; The second delivery pipeline is equipped with a fifth regulating valve and a sixth regulating valve.

8. The system of claim 7, wherein, The energy storage water pump has an inlet pipe and an outlet pipe connected to its inlet end and outlet end, respectively. The inlet end of the inlet pipe is connected to the first delivery pipe, and the outlet end of the outlet pipe is connected to the second delivery pipe. A seventh regulating valve is installed on the water inlet pipe, and an eighth regulating valve is installed on the water outlet pipe.

9. The hydraulic compressed air energy storage system of claim 8, wherein, The power generation device has an inlet pipe and an outlet pipe connected to its inlet and outlet ends, respectively. The inlet end of the inlet pipe is connected to the inlet pipeline, and the outlet end of the outlet pipe is connected to the outlet pipeline. The inlet pipe is equipped with a ninth regulating valve, and the outlet pipe is equipped with a tenth regulating valve.

10. The system of claim 1, wherein, An eleventh regulating valve is installed on the pipeline connecting the gas outlet of the gas storage tank and the first gas-water tank. A twelfth regulating valve is installed on the pipeline connecting the gas outlet of the gas storage tank and the second gas-water tank.

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