Ultra-supercritical air energy storage/release system

Abstract

The invention discloses an ultra-supercritical air energy storage / release system, which is a novel large-scale energy storage system and relates to an energy storage technology, namely, air is compressed into an ultra-supercritical state by using off-peak electricity of a power station, heat is compression is stored simultaneously, air is cooled by using an expansion engine and simultaneously expansion work is recovered to improve the efficiency, and the ultra-supercritical air is cooled, liquefied and stored by using stored cold energy; and liquid air is pressurized and absorbs heat to reach an ultra-supercritical state at the power utilization peak and further absorb heat of compression for power generation by a turbo-generator. The ultra-supercritical air energy storage / release system disclosed by the invention has the advantages of high energy density, high efficiency, no limitation by energy storage cycle and geological conditions, suitability for various power stations, environmental friendliness, capability of recovering intermediate-temperature and low-temperature waste heat and the like.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a large-scale air energy storage / release system based on an ultra-supercritical process. Background technique [0002] Power energy storage technology is currently an important means to adjust the peak and valley of the power grid and improve the economy and stability of the power system. It is one of the most important bottlenecks restricting the large-scale utilization of unstable and intermittent renewable energy. The key technology of power grid. At present, the existing electric energy storage technologies include pumped storage power stations, compressed air, storage batteries, superconducting magnetic energy, flywheels and capacitors. However, due to capacity, energy storage period, energy density, charge and discharge efficiency, lifespan, operating costs, environmental protection and other reasons, only pumped hydropower stations and compressed air have been used...

AI Technical Summary

Problems solved by technology

However, the supercritical air energy storage system still has the problems of low working pressure, large storage container and large land occupation, and the irreversible loss of liquefaction of supercritical air through the throttle valve is relatively large, the system flow is not reasonable, and the energy utilization is not sufficient, resulting in The system efficiency is low (only about 65%)

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