Liquefied air energy storage system

Abstract

The invention discloses a liquefied air energy storage system. The liquefied air energy storage system comprises an energy storage unit, a liquidation unit, a liquid storage unit storing a liquid-state working medium, a gasification unit and an energy release unit, wherein the energy storage unit comprises a compression device, a first heat exchanger and a cooler which are sequentially connected;the energy release unit comprises an expansion unit and a second heat exchanger which are sequentially connected; the liquidation unit comprises a liquidation device with an inlet end which communicates with an outlet end of the cooler; the gasification unit comprises an evaporation device with an outlet end which communicates with an inlet end of the second heat exchanger; the liquid storage unitcomprises a liquid storage device connected between the liquidation unit and the evaporation device; a gas buffer device is further communicated between the evaporation device and the second heat exchanger; and a gas-state working medium generated in the evaporation device is temporarily stored in the gas buffer device and then enters the second heat exchanger. The gas buffer device is arranged between the evaporation device and the second heat exchanger, so that a response time in a process of adjusting output frequency of the liquefied air energy storage system can be shortened, and the frequency adjustment performance of the liquefied air energy storage system is improved.

Description

technical field [0001] The invention relates to the technical field of energy and power, in particular to a liquefied air energy storage system. Background technique [0002] The compressed air energy storage system is a large-scale energy storage system with air as the medium. It converts electric energy into potential energy storage of compressed air during the low peak of power consumption, and drives the turbine to do work through compressed air to release electric energy during the peak of power consumption. The liquefied air energy storage system is a new type of energy storage system proposed on the basis of compressed air energy storage. Compared with compressed air energy storage systems, liquid air energy storage systems have higher energy storage density, do not require large pressure storage containers, get rid of the constraints of geographical conditions, and have more advantages in development and application. [0003] Participating in power grid frequency re...

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Problems solved by technology

[0004] When the turbine participates in the frequency modulation process, it is necessary to adjust the opening of the valve in front of the turbine to realize the change of output power, and the liquid air in the liquid tank needs to absorb heat and vaporize before expanding and doing work, which increases the response of the system during the frequency modulation process time, which is detrimental to the FM performance of the system

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