An isothermal compressed air energy storage system and method

Abstract

The invention relates to a constant temperature compressed air energy storage system and method. Ejectors are respectively arranged at air inlets of a compressor unit and an expander unit; during an energy storage compressing process, a quasi isothermal compression process is realized by spraying a mist or spumescent liquid heat transfer medium into the compressed air, so that the compression work of unit working medium is reduced; an air-liquid separator is assembled behind the compressor unit and is used for separating and storing the cooling medium in the compressed air; during an energy-releasing expansion process, a quasi isothermal expansion process is realized by spraying the mist or spumescent liquid heat transfer medium into the gas during the expansion process, so that the output work of unit working medium is increased and the whole efficiency of the system is increased. Compared with the traditional compressed air energy storage system, the constant temperature compressed air energy storage system has the advantages that the compressing and expanding processes can be obviously deviated from the adiabatic process, the almost constant-temperature quasi isothermal compression and quasi isothermal expansion processes are acquired, and the working efficiency of the system is increased.

Description

technical field [0001] The present invention relates to a system and method applied to electric energy storage, that is, an isothermal compressed air energy storage system and method, by spraying a mist or foamy fluid medium into the air flow during the compression process and expansion process, Realize isothermal compression and isothermal expansion, so that under the same power condition, the volume of the equipment can be reduced, the power output per unit expansion working medium can be increased, and the overall efficiency of the system can be improved. Background technique [0002] The difference between the peak and valley of the current power load is getting bigger and bigger. On the other hand, renewable energy power generation is developing rapidly. There is an urgent need for an economical, stable and efficient power storage system to match the power system, so as to achieve "peak cutting and valley filling" and Stable and grid-connected renewable energy power gen...

AI Technical Summary

Problems solved by technology

The key to realizing the isothermal compression / expansion process lies in the enhanced heat transfer in the process. Through the indirect contact heat exchange during the compression or expansion process, the heat transfer coefficient is very low, which is closer to the adiabatic process. Currently, it is commonly used in industry. The operation mode of multi-stage expansion and inter-stage heating will inevitably lead to complex system structure, increased cost and increased additional power consumption

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