Hydraulic coordination compressed air energy storage device, system and method

Abstract

The invention discloses a hydraulic coordination compressed air energy storage device, system and method. The hydraulic coordination compressed air energy storage device comprises a pneumatic power generation unit, a hydraulic power generation unit, a sealed container and a piston assembly. The bottom of the sealed container is communicated with a water source, the top of the sealed container is connected with the pneumatic power generation unit, and the bottom of the sealed container is connected with the hydroelectric power generation unit; when the piston assembly moves upwards in the sealed container, energy is stored for the pneumatic power generation unit and the hydroelectric generation unit. Atmospheric pressure difference is used as driving force, and energy storage of hydraulic power and compressed air is achieved through vertical movement of the piston. When the piston moves upwards, vacuum is formed, and water is sucked into the sealed container; and meanwhile, the upper air is extruded to form compressed air storage. The energy storage mode does not need extra energy input and can be realized by only using new energy discarded electric energy, so that the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and in particular relates to a hydraulically coordinated compressed air energy storage device, system and method. Background Art

[0002] Although thermal power generation can provide a stable supply of electricity to the power grid and is less affected by the environment, huge carbon emissions are one of the important issues. Hydropower and nuclear power are greatly affected by the terrain and surrounding resources and environment, and the investment cost is huge; photovoltaic, wind power and other new energy power generation are greatly affected by the natural environment and cannot provide stable output for the power grid. Therefore, under these premises, while carrying out industrial adjustments at the power generation end, in order to ensure the stable and safe operation of the power grid, it is particularly important to have a peak-shaving policy that smoothes the peaks and valleys of power generation and consumption. At this time, energy storage becomes an effective way to peak the power grid. Currently, the commonly used energy storage methods are: pumped storage, compressed air energy storage, flywheel, hydrogen production and electrochemical energy storage.

[0003] However, the construction site selection for pumped-storage power stations is difficult and the construction cost is high; the traditional air compression method is single and cannot achieve multi-channel energy storage, and the existing method is complex in design and has high operation and maintenance costs. Summary of the invention

[0004] The object of the present invention is to provide a hydraulically coordinated compressed air energy storage device, system and method to solve the above-mentioned problems.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A hydraulically coordinated compressed air energy storage device comprises: a pneumatic power generation unit, a hydroelectric power generation unit, a sealed container and a piston assembly; the piston assembly is installed in the sealed container, the bottom of the sealed container is connected to a water source, the top of the sealed container is connected to the pneumatic power generation unit, and the bottom is connected to the hydroelectric power generation unit; when the piston assembly moves upward in the sealed container, it stores energy for the pneumatic power generation unit and the hydroelectric power generation unit.

[0006] Furthermore, the piston assembly includes a piston power device and a piston, the piston power device is arranged on the top of the sealed container, the piston is arranged inside the sealed container, and the piston power device is connected to the piston.

[0007] Furthermore, the power source of the piston power device is the waste electricity of new energy.

[0008] Furthermore, the hydroelectric power generation unit includes a drainage gate valve and a hydroelectric generator. An outlet is arranged on the bottom side of the sealed container. The drainage gate valve is arranged at the outlet of the sealed container, and the outlet is connected to the hydroelectric generator.

[0009] Further, the pneumatic power generation unit includes a compressed air unit and a compressed air power generation device. The compressed air unit is connected to the top of the sealed container through a pipeline, and the compressed air power generation device is connected to the compressed air unit through a pipeline.

[0010] Further, an exhaust valve is provided on the pipeline between the compressed air unit and the sealed container; an exhaust valve at the outlet of the compressed air unit is provided between the compressed air power generation device and the compressed air unit.

[0011] Further, a water inlet is provided at the bottom of the sealed container. The water inlet is connected to a water source, and a water inlet valve is provided on the water inlet.

[0012] Further, reciprocating pistons are provided both inside the compressed air unit and inside the pipeline at the inlet of the compressed air unit. The two pistons are connected by a connecting rod.

[0013] A hydraulic coordinated compressed air energy storage system includes a plurality of the hydraulic coordinated compressed air energy storage devices. The plurality of hydraulic coordinated compressed air energy storage devices are installed side by side, and the pneumatic power generation units and hydraulic power generation units of all the hydraulic coordinated compressed air energy storage devices are connected to the power grid.

[0014] A hydraulic coordinated compressed air energy storage method includes the following steps: Step 1: When the new energy power cannot be fed into the grid, first open the exhaust valve and the water inlet valve. At the same time, start the piston power device through the abandoned electric energy of the new energy. The piston power device drives the piston to move upward through the connecting rod. During the upward movement of the piston, a vacuum is formed between the lower part of the piston and the bottom of the sealed container. Under the action of the atmospheric pressure, water is pressed into the inside of the sealed container from the water inlet valve. When the piston moves upward, it will squeeze the upper air, and the upper air will form compressed air storage in the compressed air unit under the action of the piston through the exhaust valve. Step 2: After the water level in the tank is stable and unchanged, turn off the piston power device, close the water inlet valve and the exhaust valve. At this time, the piston is fixed at the current position, and the positions of the pistons in the compressed air storage unit and the water level in the sealed container both remain unchanged. Step 3: When it is necessary to transmit power to the power grid, first open the exhaust valve at the outlet of the compressed air unit, and convert the internal energy of the compressed air into electric energy through the compressed air power generation device and transmit it to the grid. Step 4: After the compressed air is discharged, open the exhaust valve, and then open the drainage sluice valve. At this time, the water in the sealed container will enter the hydraulic generator through the pipeline for power generation; the piston will also start to descend as the water level drops until the water level in the tank reaches the point where power generation is no longer possible.

[0015] Step 5: When all the water in the tank is released or the hydraulic generator can no longer generate power, close the drainage sluice valve, close the exhaust valve and the exhaust valve at the compressed air outlet, and complete the storage and release of the abandoned electric energy.

[0016] Compared with the prior art, the present invention has the following technical effects: The design of the device of the present invention is relatively simple, mainly consisting of a pneumatic power generation unit, a hydroelectric power generation unit, a sealed container and a piston assembly, without a complex mechanical structure and control system. Because the main components of the device such as the sealed container, the piston, the hydroelectric generator, etc. are common industrial products, they are easy to purchase and assemble. It is easy to operate, and the entire energy storage and release process can be achieved through simple valve control, with a high degree of automation and low maintenance cost.

[0017] The present invention uses atmospheric pressure difference as driving force, and realizes water power and compressed air energy storage through the up and down movement of the piston. When the piston moves upward, a vacuum is formed, and water is sucked into the sealed container; at the same time, the upper air is squeezed to form compressed air storage. This energy storage method does not require additional energy input, and can be realized by only using new energy and discarded electricity, thereby improving energy utilization efficiency.

[0018] The present invention integrates compressed air energy storage and hydraulic energy storage, and the device can flexibly store and release energy according to the needs of the power grid. In the energy storage stage, compressed air and hydraulic energy can be used to store energy at the same time, which improves the energy storage efficiency. In the energy release stage, the electric energy generated by compressed air energy storage can be released first, and then the electric energy generated by hydraulic energy storage can be released, which prolongs the energy release time and improves the stability of the power grid.

[0019] Compared with pumped storage, it has more flexibility in site selection and design and construction: Pumped storage power stations require specific geographical conditions, such as mountains and reservoirs, while this device has lower requirements for geographical conditions and can be built on flat land or in low-lying areas. It is more flexible in design and construction, and the scale and layout of the device can be adjusted according to actual needs to adapt to different application scenarios.

[0020] The device can quickly respond to grid demand and perform energy storage and release operations. When the grid load is low, it can use the abandoned electricity from new energy sources for energy storage; when the grid load is high, it can release the stored electricity for peak load regulation. By integrating multiple energy storage methods, the device can provide more stable and reliable power output, improving the stability and reliability of the grid.

[0021] In summary, this technical solution achieves efficient storage and release of electric energy by integrating compressed air energy storage and hydraulic energy storage. The device has a simple design, low construction cost, convenient operation, greater flexibility in grid peak regulation, and more flexibility in site selection and design and construction. Therefore, this technical solution has broad application prospects in small energy storage projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the structure of the present invention.

[0023] in: 1. Piston power unit; 2. Exhaust valve; 3. Compressed air unit; 4. Exhaust valve at the outlet of compressed air unit; 5. Compressed air power generation unit; 6. Sealed container; 7. Piston; 8. Drain gate valve; 9. Hydroelectric generator; 10. Water inlet valve. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The present invention is further described below in conjunction with the accompanying drawings: Example 1, please refer to Figure 1 The present invention provides a hydraulic coordinated compressed air energy storage device, comprising: a pneumatic power generation unit, a hydroelectric power generation unit, a sealed container 6 and a piston assembly; the piston assembly is installed in the sealed container 6, the bottom of the sealed container 6 is connected to a water source, the top of the sealed container 6 is connected to the pneumatic power generation unit, and the bottom is connected to the hydroelectric power generation unit; when the piston assembly moves upward in the sealed container 6, it stores energy for the pneumatic power generation unit and the hydroelectric power generation unit.

[0028] When the piston assembly moves upward in the sealed container, it simultaneously stores energy for the pneumatic power generation unit and the hydroelectric power generation unit. This dual energy storage mechanism significantly improves the energy storage efficiency, allowing the device to store a large amount of electrical energy in a shorter period of time.

[0029] The pneumatic power generation unit stores energy through compressed air, while the hydroelectric power generation unit stores energy through the potential energy or kinetic energy of water. These two energy storage methods are independent of each other but coordinated with each other to form a highly efficient energy storage system for the device.

[0030] The device can flexibly release the stored energy according to the needs of the power grid. When electricity is needed, the pneumatic energy can be released first through the compressed air generator, and then the hydraulic energy can be released through the hydroelectric generator. This flexible energy release method allows the device to better adapt to fluctuations and changes in the power grid.

[0031] By using the discarded electric energy of new energy to drive the piston assembly to move upward, the device realizes the effective use of new energy. This design not only reduces the waste of new energy, but also improves the utilization rate of the entire energy system.

[0032] The device can quickly respond to changes in grid demand and perform energy storage and release operations. This helps balance the supply and demand of the grid, reduce grid fluctuations and instability, and thus improve the overall stability of the grid.

[0033] The design of the device is relatively simple, without complex mechanical structure and control system, so the construction and operation costs are relatively low. This makes the device more economical and feasible in small energy storage projects.

[0034] The device does not produce harmful emissions during operation and is environmentally friendly. At the same time, by using new energy to store discarded electricity, it also helps reduce the use of fossil energy and carbon emissions, which has positive significance for environmental protection.

[0035] In summary, the hydraulic coordinated compressed air energy storage device provided by the present invention has multiple technical effects such as efficient energy storage, flexible energy release, improved energy utilization, enhanced grid stability, reduced construction and operation costs, and environmental friendliness. These effects make the device have broad application prospects and huge market potential in the field of power energy storage.

[0036] Embodiment 2, like Figure 1As shown, the device is to build a sealable container around large lakes, oceans, rivers, etc. (when storing energy, the water level does not drop), and the bottom part of the pipeline of the sealed container 6 is deep below the liquid level. The part of the sealed container 6 connected to the water surface has an openable and closable water inlet valve 10; a sealable piston 7 is arranged inside the sealed container 6, and the piston 7 is connected to the piston power device 1 arranged on the upper part of the sealed container 6. An exhaust pipe and a valve 2 are also designed on the upper part of the sealed container 6. A piston is designed at the end of the outlet of the exhaust pipe, and the piston is connected to the piston of the compressed air unit 3 through a connecting rod. The outlet of the compressed air unit 3 is designed to be connected to the compressed air power generation device through a pipeline. The lower part of the sealed container 6 is designed with a drainage gate valve 8 and a pipeline and is connected to a hydroelectric generator 9. The water discharged by the hydroelectric generator 9 is then discharged into rivers and lakes.

[0037] Piston power device: mainly uses the discarded electricity of new energy as the power source; it is designed on the top of the equipment tank and connected to the piston through a connecting rod to provide power for the piston.

[0038] Exhaust valve: designed to be connected to the top of the tank, one end is connected to the tank and the other end is connected to the compressed air unit.

[0039] Compressed air unit: connected to the exhaust valve through a pipeline. The compressed air unit and the exhaust valve outlet end pipeline are designed with reciprocating pistons, and the two pistons are connected by a connecting rod. When the exhaust valve is opened and gas is discharged, the outlet pipeline piston pushes the compressed air unit piston to compress the air.

[0040] Compressed air unit outlet exhaust valve: one end is connected to the compressed air unit outlet through a pipeline, and the other end is connected to the compressed air generator. When the valve is opened, the compressed air of the compressed air unit will enter the compressed air generator through the pipeline to generate electricity.

[0041] Compressed air power generation device: a device connected to the outlet pipe of the compressed air unit and used to convert the internal energy of the compressed air stored in the compressed air unit into electrical energy.

[0042] Sealed container: A sealed device designed near a water source to store water. The upper part is designed with a piston power device and an exhaust pipe; the interior is designed with a reciprocating sealed piston; the lower part is designed with a water discharge gate valve; the bottom is extended below the water surface through a pipe.

[0043] Piston: Designed to be inside a sealed container, it is airtight and uses the kinetic energy provided by a piston power device to perform reciprocating motion.

[0044] Drainage gate valve: designed at the bottom of the sealed container and connected to the hydroelectric generator through a pipe.

[0045] Hydroelectric generator: It is used to convert the potential energy of water released from a sealed tank into kinetic energy of a water turbine and generate electricity.

[0046] Water inlet valve: Open when the piston starts to lift and close when it ends. When the tank is vacuumed, it is connected to the water surface to allow water to enter the tank. After the water level in the tank stabilizes, the water surface is isolated from the tank body.

[0047] Device operation process Before starting, all valves are closed, there is no water in the tank, and the piston is in the bottom area of ​​the sealed container.

[0048] Step 1: When the electricity from new energy sources such as photovoltaic power and wind power cannot be connected to the grid, first open the exhaust valve 2 and the water inlet valve 10. At the same time, the piston power device 1 is started by the abandoned electricity from new energy sources, and the piston power device drives the piston 7 to move upward through the connecting rod. During the upward movement of the piston 7, a vacuum is formed between the lower part of the piston and the bottom of the sealed container, and water is pressed into the sealed container from the water inlet valve 10 under the action of atmospheric pressure.

[0049] At the same time, when the piston moves upward, it will squeeze the upper air, and the upper air will pass through the exhaust valve 2 under the action of the piston to form compressed air storage in the compressed air unit.

[0050] The piston is lifted until the water level in the tank stabilizes at a certain height.

[0051] Step 2: After the water level in the tank body stabilizes, turn off the piston power device 1, and close the water inlet valve 10 and the exhaust valve 2. At this time, the piston 7 is fixed at the current position, and the piston position of the compressed air storage unit 3 and the water level in the sealed container 6 remain unchanged.

[0052] Step 3: When it is necessary to transmit electricity to the power grid, first open the compressed air unit outlet exhaust valve 4, and convert the internal energy of the compressed air into electrical energy through the compressed air power generation device 5 and transmit it to the grid.

[0053] Step 4: After the compressed air is released, open the exhaust valve 2, and then open the drain gate valve 8. At this time, the water in the sealed container 6 will enter the hydroelectric generator 9 through the pipeline to generate electricity. The piston 7 will also begin to drop as the water level drops. Until the water level in the tank reaches a certain position and can no longer generate electricity.

[0054] Step 5: When all the water in the tank is released or the hydroelectric generator can no longer generate electricity, close the drain gate valve 8, and close the exhaust valve 2 and the compressed air outlet exhaust valve 4.

[0055] Therefore, the cyclic operation of steps 1-5 can complete the storage and release of abandoned electricity, thereby achieving the purpose of energy storage.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic coordinated compressed air energy storage device, characterized in that: include: A pneumatic power generation unit, a hydroelectric power generation unit, a sealed container (6) and a piston assembly; the piston assembly is installed in the sealed container (6), the bottom of the sealed container (6) is connected to a water source, the top of the sealed container (6) is connected to the pneumatic power generation unit, and the bottom is connected to the hydroelectric power generation unit; when the piston assembly moves upward in the sealed container (6), it stores energy in the pneumatic power generation unit and the hydroelectric power generation unit.

2. A hydraulic coordinated compressed air energy storage device according to claim 1, characterized in that: The piston assembly comprises a piston power device (1) and a piston (7); the piston power device (1) is arranged on the top of a sealed container (6); the piston (7) is arranged inside the sealed container (6); and the piston power device (1) is connected to the piston (7).

3. A hydraulic coordinated compressed air energy storage device according to claim 2, characterized in that: The power source of the piston power device (1) is the waste electric energy of new energy.

4. A hydraulic coordinated compressed air energy storage device according to claim 1, characterized in that: The hydroelectric power generation unit comprises a drainage gate valve (8) and a hydroelectric generator (9). An outlet is provided on the bottom side of the sealed container (6). The drainage gate valve (8) is provided at the outlet of the sealed container (6), and the outlet is connected to the hydroelectric generator (9).

5. A hydraulic coordinated compressed air energy storage device according to claim 1, characterized in that: The pneumatic power generation unit comprises a compressed air unit (3) and a compressed air power generation device (5); the compressed air unit (3) is connected to the top of a sealed container (6) via a pipeline, and the compressed air power generation device (5) is connected to the compressed air unit (3) via a pipeline.

6. A hydraulic coordinated compressed air energy storage device according to claim 5, characterized in that: An exhaust valve (2) is provided on the pipeline between the compressed air unit (3) and the sealed container (6); and a compressed air unit outlet exhaust valve (4) is provided between the compressed air power generation device (5) and the compressed air unit (3).

7. A hydraulic coordinated compressed air energy storage device according to claim 1, characterized in that: A water inlet is provided at the bottom of the sealed container (6), the water inlet is connected to a water source, and a water inlet valve (10) is provided on the water inlet.

8. A hydraulic coordinated compressed air energy storage device according to claim 5, characterized in that: A piston capable of reciprocating motion is arranged in the compressed air unit (3) and in the compressed air unit inlet pipeline, and the two pistons are connected by a connecting rod.

9. A hydraulically coordinated compressed air energy storage system, characterized in that: It comprises a plurality of hydraulically coordinated compressed air energy storage devices as described in any one of claims 1 to 8, wherein the plurality of hydraulically coordinated compressed air energy storage devices are installed side by side, and the pneumatic power generation units and the hydraulic power generation units of all the hydraulically coordinated compressed air energy storage devices are connected to the power grid.

10. A hydraulic coordinated compressed air energy storage method, characterized in that: The hydraulic coordinated compressed air energy storage device according to any one of claims 1 to 8 comprises the following steps: Step 1: When the renewable energy power cannot be connected to the grid, first open the exhaust valve and the water inlet valve. At the same time, the piston power device is started by the abandoned electricity from the renewable energy. The piston power device drives the piston to move upward through the connecting rod. During the upward movement of the piston, a vacuum is formed between the lower part of the piston and the bottom of the sealed container. Under the action of atmospheric pressure, water is pressed into the sealed container from the water inlet valve. When the piston moves upward, the upper air is squeezed. Under the action of the piston, the upper air passes through the exhaust valve and forms compressed air storage in the compressed air unit. Step 2: After the water level in the tank body is stable, turn off the piston power device, close the water inlet valve and the exhaust valve. At this time, the piston is fixed at the current position, and the piston position of the compressed air storage unit and the water level in the sealed container remain unchanged; Step 3: When it is necessary to transmit electricity to the grid, first open the exhaust valve at the outlet of the compressed air unit, and convert the internal energy of the compressed air into electrical energy through the compressed air power generation device and transmit it to the grid; Step 4: After the compressed air is released, open the exhaust valve and then the drain gate valve. At this time, the water in the sealed container will enter the hydroelectric generator through the pipeline to generate electricity; the piston will also begin to drop as the water level drops until the water level in the tank reaches a point where it can no longer generate electricity; Step 5: When all the water in the tank is released or the hydroelectric generator can no longer generate electricity, close the drain gate valve, the exhaust valve and the compressed air outlet exhaust valve to complete the storage and release of the abandoned electricity.

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