Thermal insulation constant-pressure compressed air energy storage system based on volatile fluid

Abstract

The invention discloses a thermal insulation constant-pressure compressed air energy storage system based on a volatile fluid. The system comprises a motor, an air compressor unit, an air storage tank, an expander unit and a generator; an output end of the motor is connected with an input end of the air compressor unit; an exhaust end of the air compressor unit is connected with an input end of the air storage tank; an output end of the air storage tank is connected with an intake end of the expander unit; and an output end of the expander unit is connected with the generator. The system further comprises a piston arranged in the air storage tank; an inner cavity of the air storage tank is divided into a first cavity and a second cavity by the piston; the piston is arranged in the air storage tank in a moving manner; the first cavity communicates with the exhaust end of the air compressor unit; and the volatile fluid is arranged in the second cavity. The system further comprises a heatexchange system for heat exchange with the second cavity. The system totally uses compressed air in the air storage tank, can reduce the exergy loss, and improves the energy utilization efficiency.

Description

technical field [0001] The invention relates to an adiabatic constant pressure compressed air energy storage system based on volatile fluid. Background technique [0002] With the continuous growth of energy demand, it is imperative to use energy efficiently, but the problems in the operation of the power grid have caused great waste and damage. Energy storage technology can improve the quality of electric energy and maintain the stability of the power system; overcome the intermittent characteristics of renewable energy (wind energy, solar energy, etc.), and use energy storage technology to "splicing" wind energy, solar energy and other energy sources to form a stable power supply direction. Users provide continuous power supply on demand; the energy storage unit forms a dispatchable unit, which stores and releases energy according to the valley and peak values ​​of the electricity price, improving the economic benefits of electricity. Adiabatic compressed air energy stora...

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Problems solved by technology

[0004] Traditional CAES usually needs to store compressed air in underground caves, and harsh geographical conditions become the main factor limiting its promotion

At present, when the energy is released, the pressure of the compressed air decreases continuously with the reduction of the amount of compressed air. In order to ensure the stable operation of the expander, it is necessary to use the high-pressure air after throttling and reducing the pressure through the pressure stabilizing device, which wastes a lot of compression. energy, and the energy loss is caused by the throttling of compressed air

In addition, as the pressure in the air storage tank decreases, there will eventually be low-pressure air that is not utilized, compressed air is not fully utilized, and the utilization efficiency of the air storage tank is low

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