Compressed air energy storage system based on organic flash evaporation circulation and control method

Abstract

The invention discloses a compressed air energy storage system based on organic flash evaporation circulation and a control method. The system comprises an electric energy storage system, an electric energy release system and an organic flash evaporation circulation system. The electric energy storage system comprises a compressor, an interstage cooler, a high-pressure gas storage tank and a heat storage tank, and the interstage cooler stores waste heat generated by the compressor into the heat storage tank; the electric energy release system comprises an expansion machine connected with an external generator, and the expansion machine is connected with a high-pressure gas storage tank; the organic flash evaporation circulating system comprises a gas-liquid separator, an expansion machine, a first heat exchanger, a mixer, a condenser, a working medium pump and a second heat exchanger, an organic working medium absorbs heat in the heat storage tank through the second heat exchanger to reach a saturated liquid state and then is subjected to gas-liquid separation, a gas working medium pushes the expansion machine to do work, and a liquid working medium is introduced into the first heat exchanger; the expander and a working medium outlet of the first heat exchanger are connected with a mixer which is connected with a condenser. The heat exchange matching degree of the cold source and the heat source is improved, the heat exchange efficiency is improved, and the energy loss is reduced.

Description

Technical field [0001] The present invention belongs to the field of energy storage technology, relates to a compressed air energy storage system and control method based on organic flash cycle. Background [0002] Solar and wind energy are clean and renewable energy sources. However, changes in weather and seasons will affect the stability of power generation, and even the oscillation of the power distribution network poses a challenge to the stability and capacity of the integrated power grid. Compressed air energy storage technology can use poor quality electrical energy to compress air, and then drive the expander through high-pressure air to work and output high-quality electrical energy. [0003] Since the compressed air energy storage technology will produce a large amount of waste heat in the compressed air stage, patent CN108533343A discloses a method of using the organic Rankine cycle (ORC) to recover waste heat in the compressed air stage, but the organic Langen cycle...

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the above-mentioned compressed air energy storage system in the prior art To solve the problem of high loss and low efficiency, a compressed air energy storage system and control method based on an organic flash cycle (OFC) is provided to recover the waste heat generated in the compressed air stage to generate electricity, and improve the compressed air energy storage system. energy storage efficiency

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