Hydraulic-compressed air coordinated energy storage device and method

Abstract

A kind of hydraulic-compressed air coordinated energy storage device and method, including water pool, water inlet, water outlet, gas injection device, gas storage device, compressed air generator and water turbine generator;Water pool is provided with water inlet at one end, and is provided with water outlet at the other end, water inlet is higher than water outlet, and water outlet is connected water turbine generator;Gas storage device is arranged in the water pool, and one end of gas storage device is connected gas injection device, and the other end is connected compressed air generator, and compressed air generator and gas injection device are all outside the water pool.The present application can realize the electric energy of new energy that cannot be connected to network is converted into the gravitational potential energy of water and the internal energy of compressed air respectively, and then is utilized, so as to reach the purpose of efficient energy storage.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage, and particularly relates to a hydraulic-compressed air coordinated energy storage device and method. BACKGROUND

[0002] The proportion of wind power and photovoltaic power transmission on the grid is increasing, but due to the unstable nature of wind power and photovoltaic power generation, it is difficult for new energy power generation to be fully received and utilized by the power grid to ensure the safe, stable and smooth operation of the regional power grid, which leads to the waste of part of the new energy power generation.

[0003] Common new energy storage includes electrochemical energy storage, compressed air storage, pumped storage, flywheel energy storage, etc. At present, in addition to electrochemical energy storage and pumped storage having high energy storage efficiency, the energy storage efficiency of other modes is not very high. SUMMARY

[0004] The application aims to provide a hydraulic-compressed air coordinated energy storage device and method to solve the problem of low energy storage efficiency of existing energy storage technology.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0006] A hydraulic-compressed air coordinated energy storage device, comprising a water pool, a water inlet, a water outlet, a gas injection device, a gas storage device, a compressed air generator and a water turbine generator; the water pool is provided with the water inlet at one end and the water outlet at the other end, the water inlet is higher than the water outlet, and the water outlet is connected to the water turbine generator; the gas storage device is arranged inside the water pool, one end of the gas storage device is connected to the gas injection device, and the other end of the gas storage device is connected to the compressed air generator, and the compressed air generator and the gas injection device are both outside the water pool.

[0007] Further, the gas injection device comprises an air compressor and a compressed air tank; the air compressor is connected to the compressed air tank, and the compressed air tank is connected to the gas storage device.

[0008] Further, the gas storage device comprises a plurality of compressed air storage balls, and the plurality of compressed air storage balls are connected in series.

[0009] Further, the plurality of compressed air storage balls are arranged in series at the bottom of the water pool.

[0010] Further, the water level of the plurality of compressed air storage balls when expanded is higher than the water outlet.

[0011] Further, the height of the water turbine generator is lower than the height of the water outlet.

[0012] Further, a water inlet gate is arranged on the water inlet, and a water outlet gate is arranged on the water outlet.

[0013] Further, a water force-compressed air coordinated energy storage method of an energy storage device, comprising the following steps:

[0014] Step 1: open the water inlet gate, fill the water tank with water, close the water inlet gate when the water level reaches the lower part of the water outlet, and keep the water outlet gate closed at this time;

[0015] Step 2: start the air compressor through new energy power generation, and fill compressed air into the compressed air storage ball through the compressed air tank until the ball expands to the designed volume and the ball pressure reaches the requirement, close the valve along the way and close the air compressor; at this time, the water level is raised to a height exceeding the set distance of the water outlet;

[0016] Step 3: when the power grid needs to transmit power, open the water outlet gate, generate electricity through the water turbine generator until the water level is lowered to the position below the water outlet, and close the water outlet gate;

[0017] Step 4: open the valve on the compressed air ball discharge pipeline, convert the compressed air internal energy in the compressed air storage ball into electrical energy through the compressed air power generation device until the compressed air in the ball can no longer generate electricity.

[0018] Compared with the prior art, the present application has the following technical effects:

[0019] The present application stores compressed air by using the compressed air storage ball arranged fixedly at the bottom of the small-sized water power generation device. When the new energy cannot be connected to the grid, the compressed air is injected into the ball by using the air compressor to store energy. When the ball is inflated, the volume of the ball increases, which pushes up the water level and converts the new energy into the internal energy of compressed air and the gravitational potential energy of water. The converted gravitational potential energy of water is converted into electrical energy through water power generation, and the internal energy of compressed air is converted into electrical energy through the compressed air power generation device. In this way, the water power station, power generation, water replenishment, power generation and inflation of the compressed air storage ball are coordinated, which can convert the electrical energy of new energy that cannot be connected to the grid into the gravitational potential energy of water and the internal energy of compressed air, and then generate electricity respectively, so that the purpose of efficient energy storage can be achieved.

[0020] The present application has less energy storage-transmission limiting factors and can realize fast response. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Water force-compressed air coordinated energy storage method diagram.

[0022] Figure 2 Water force-compressed air coordinated energy storage device diagram.

[0023] Wherein:

[0024] 1. Inlet gate; 2. Air compressor; 3. Compressed air tank; 4. Compressed air storage sphere;

[0025] 5. Compressed air generator; 6. Water outlet gate; 7. Hydroelectric generator. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] Please see Figure 1 and Figure 2 A hydraulic-compressed air coordinated energy storage device and method, the device comprising:

[0028] 1) Inlet gate: Used to replenish water into the hydroelectric power generation device.

[0029] 2) Air compressor: Uses new energy electricity to provide compressed air for compressed air storage spheres.

[0030] 3) Compressed air tank: Located in the outlet pipeline of the air compressor, it stabilizes the compressed air pressure and provides a stable pressure for the compressed air storage sphere.

[0031] 4) Compressed air storage spheres: Made of expandable and waterproof material, they have a certain pressure resistance; they can store or release compressed air, and their volume gradually expands as pressure increases, allowing them to store compressed air at a certain pressure. Compressed air storage spheres can be made of modified rubber or polymer materials with strong pressure resistance and high elasticity and flexibility.

[0032] 5) Compressed air power generation device: The gas discharge pipeline of the compressed air storage sphere is designed to generate electricity using the compressed air discharge airflow, and is not limited to power generation devices such as wind turbines.

[0033] 6) Drainage gate: A gate on a hydroelectric power generation device that is connected to the drainage channel. The lower part is connected to the turbine power generation device. Opening the gate can push water downstream and drive the turbine to generate electricity.

[0034] 7) Hydroelectric generator: Installed downstream of the hydroelectric power generation device, it converts the gravitational potential energy of water into electrical energy through the hydroelectric generator.

[0035] Device operation

[0036] Step 1: Open the first inlet gate to fill the bottom of the hydroelectric power generation unit with water. After the water level reaches the lower part of the drain valve, close the first inlet gate. Figure 2 At position L shown, the 6-valve gate should remain closed.

[0037] Step 2: New energy power generation starts 2 air compressor and fills compressed air into 4 compressed air storage ball through 3 compressed air tank. Until the ball expands to the designed volume and the ball pressure reaches the requirement, close the valve along the way and close the air compressor; at this time, the water level rises to the design requirement of H position.

[0038] Step 3: When the power grid needs to deliver power, open 6 sluice gate, generate electricity through 7 water turbine generator, until the water level from H decreases to L position, close 6 sluice gate, at this time the whole water gravity potential energy has been converted into electric energy.

[0039] Step 4: Open the valve on the compressed air ball release pipeline, convert the compressed air internal energy in 4 compressed air storage ball into electric energy through 5 compressed air power generation device. Until the compressed air in the ball can no longer generate electricity. At this time the ball collapses and the gas is completely released.

[0040] At this time, all the stored energy has been completely converted into electric energy delivered to the power grid. Steps 1-4 can be repeated, which can realize cyclic energy storage and provide help for realizing effective use of new energy and peak load shifting of power grid.

[0041] This method is to convert new energy electric energy into water gravity potential energy and compressed air internal energy at the same time through one-step action, and then gradually release the stored energy to convert into on-grid electric energy. The realization method can refer to Figure 1 , the schematic diagram is shown in Figure 2 , and the specific process is described as follows.

[0042] 1) Fill the water at the bottom of the hydroelectric power generation device to the water level below the water discharge valve and close the water inlet gate. It can ensure that the water level can rise above the standby of the power generation device gate after the compressed air ball at the bottom of the hydroelectric power generation device is inflated.

[0043] 2) When new energy power cannot be put on the grid, new energy power generation starts air compressor and continuously injects compressed air into the compressed air storage ball arranged at the bottom of the water. At this time, the gas storage ball starts to expand and pushes the water level up. At this time, the new energy electric energy is converted into the gravity potential energy of the ball pushing away the water and the internal energy of the compressed air. When the ball reaches the maximum and the pressure reaches the limit, stop the air compressor. At this time, the energy storage process is completed.

[0044] 3) When it is needed to deliver electric energy to the power grid, first open the gate of the hydroelectric power generation device, release the raised water level through the gate, and drive the water turbine generator to generate electricity, convert the gravity potential energy of water into electric energy, until the water turbine cannot generate electricity any more.

[0045] 4) When the previous step is finished, open the ball exhaust valve, which is connected with the compressed air energy storage power generation device through a pipeline, to convert the internal energy of compressed air into electric energy until the compressed air is completely discharged.

[0046] 5) After the previous step is finished, open the water inlet gate of the hydroelectric power generation device to discharge water until the water level reaches the same level as in the first step.

[0047] Working principle:

[0048] The application introduces a small-scale hydro-compressed air coordinated energy storage method and device. The method is a kind of energy storage mode for reusing abandoned wind and light electric power of the power grid to generate electricity.

[0049] The application is a kind of energy storage mode for coordinating small-scale hydroelectric power stations with compressed air energy storage. The principle is to store compressed air in the bottom of the small-scale hydroelectric power generation device to store energy. When new energy cannot be connected to the grid, the compressed air is injected into the ball storage by using new energy electric power and air compressor.

[0050] When the ball is inflated, the volume of the ball increases, the water level rises, and the new energy electric energy is converted into the internal energy of compressed air and the gravitational potential energy of water. The converted gravitational potential energy of water is converted into electric energy by hydroelectric power generation, and the internal energy of compressed air is converted into electric energy by compressed air driving compressed air energy storage power generation device. In this way, the hydroelectric power station, power generation, water replenishment, power generation, and inflation of the compressed air storage ball, coordinated discharge, can convert the electric energy of new energy that cannot be connected to the grid into the gravitational potential energy of water and the internal energy of compressed air, and then generate electricity respectively, so as to achieve the purpose of efficient energy storage.

Claims

1. A hydraulic-compressed air coordinated energy storage device, characterized in that, It includes a water tank (8), an inlet, an outlet, an air injection device, an air storage device, a compressed air generator (5), and a water turbine generator (7); the water tank (8) has an inlet at one end and an outlet at the other end, with the inlet higher than the outlet, and the outlet connected to the water turbine generator (7); the air storage device is located inside the water tank (8), with one end connected to the air injection device and the other end connected to the compressed air generator (5), and both the compressed air generator (5) and the air injection device are outside the water tank (8); The air injection device includes an air compressor (2) and a compressed air tank (3); the air compressor (2) is connected to the compressed air tank (3), and the compressed air tank (3) is connected to the air storage device; The gas storage device includes several compressed air storage balls (4), which are connected in series. Several compressed air storage balls (4) are arranged in sequence at the bottom of the pool; The water level of several compressed air storage spheres (4) is higher than that of the outlet when they expand; An inlet gate (1) is installed on the inlet, and an outlet gate (6) is installed on the outlet.

2. The hydraulic-compressed air coordinated energy storage device according to claim 1, characterized in that, The height of the hydro-generator (7) is lower than the height of the outlet.

3. An energy storage method for a hydraulic-compressed air coordinated energy storage device, characterized in that, The hydraulic-compressed air coordinated energy storage device according to any one of claims 1 to 2 includes the following steps: Step 1: Open the inlet gate valve to fill the bottom of the pool with water. Once the water level reaches the bottom of the outlet, close the inlet gate valve. At this time, keep the drain gate valve closed. Step 2: The new energy power generation unit starts the air compressor and fills the compressed air storage sphere with compressed air through the compressed air tank until the sphere expands to the designed volume and the sphere pressure reaches the required level. Then, close the valves along the way and shut down the air compressor. At this time, the water level rises to a height exceeding the set distance from the outlet. Step 3: When the power grid needs to transmit electricity, open the water outlet gate to generate electricity through the water turbine generator until the water level drops to below the outlet, then close the water outlet gate. Step 4: Open the valve on the compressed air vent pipe to convert the internal energy of the compressed air stored in the sphere into electrical energy through the compressed air generator until the compressed air in the sphere can no longer generate electricity.

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