Compressed air energy storing device with constant-pressure air storage function

Abstract

The invention discloses a compressed air energy storing device with a constant-pressure air storage function. The compressed air energy storing device with the constant-pressure air storage function comprises an air compression unit A, an air expansion working unit B, a high-pressure air storing container C, a motor M, a generator G, a pumped storage power generation unit E, an external water source W, an air pipeline D1, a high-pressure liquid pipeline D2, a liquid pipeline D3, a valve F1, a valve F2 and a valve F3. The high-pressure air storing container C is provided with an upper port and a lower port. The upper port is connected with the air compression unit A and the air expansion working unit B through the air pipeline D1. The lower port is connected with the pumped storage power generation unit E through the high-pressure liquid pipeline D2. The pumped storage power generation unit E is connected with the external water source W through the liquid pipeline D3. The air compression unit A is connected with the motor M. The air expansion working unit B is connected with the generator G. It is guaranteed that the air storage pressure intensity is stable when a system operates through a pressure-stabilizing control strategy of the high-pressure air storing container C. By adoption of the compressed air energy storing device, it is guaranteed that main equipment of the energy storing system can always work under rated working conditions in the operating process.

Description

technical field [0001] The invention belongs to the design field of compressed air energy storage systems, in particular to a compressed air energy storage device for realizing gas constant pressure storage. Background technique [0002] The compressed air energy storage technology in the prior art includes the energy storage process and the energy release process. The principle is: in the energy storage process, the air compressor compresses the air driven by electric energy, and the electric energy is converted into the internal energy of the compressed air Stored in the gas storage container; during the energy release process, the compressed air in the gas storage container is discharged, expands in the air expander to do work, drives the large shaft to rotate, and then drives the generator to generate electricity, thereby outputting electric energy to the outside world. [0003] Pumped storage is a more commonly used energy storage method in the existing technology. The ...

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Problems solved by technology

However, the high-pressure gas storage container in the compressed air energy storage system has technical and technological limitations. Generally, the higher the pressure level of the gas stored in the high-pressure gas storage container, the greater the energy storage density and the lower the unit energy storage cost. The ability of the gas storage container wall to withstand the gas pressure has high requirements. On the other hand, the higher the internal pressure of the high-pressure gas storage container, the more complicated the structural design to resist pressure fluctuations, and the higher the construction cost.

These two requirements will undoubtedly increase the difficulty of material selection and manufacturing cost of the gas tank. At the same time, the fluctuation of the internal pressure of the high-grade high-pressure gas storage container will also cause great hidden dangers in safe operation.

[0004] In the prior art compressed air energy storage technology, the gas storage container is switched back and forth between the high temperature and high pressure environment of the energy storage working state and the low temperature and low pressure environment of the energy release working state. If things go on like this, it is easy to cause the metal fatigue or rock collapse

If high-strength materials are used, there will be problems of difficult manufacturing, high cost, and safety problems caused by immature pressure control technology; therefore, it is hoped that there will be a compressed air energy storage device that can store gas at a constant pressure to transform the traditional air storage system. Improve the stability of the gas storage system, increase the life of the system, and reduce the cost of the system; therefore, the manufacturing cost and safety issues of the high-pressure gas storage containers in the prior art have become a technical problem to be solved urgently in this technical field

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