Deep-refrigerating liquid air energy storage system with air stage intercooling

Abstract

The invention provides a deep-refrigerating liquid air energy storage system with air stage intercooling. During a conventional liquidation process, air is subjected to stage intercooling through each stage of compressor, so that the energy consumption of the compressors is greatly reduced. However, when the heat storage temperature is lower, the output power of the unit mass of an expansion unit 7 is less, and when the heat storage temperature is higher, the strength of an air compressor group 1 is limited, so that during a liquidation air energy storage system design process, both the air compressor group 1 and the expansion unit 7 need to be considered comprehensively, and thus the optimization design is made. According to the embodiment of the invention, one stage of compressor is set to be a cooling compressor only for cooling but not for compressing, so that the temperature and pressure conditions of liquid air can be reliably controlled, and the storage internal energy is helped to be improved.

Description

technical field [0001] The invention relates to the technical field of cryogenic liquefied air energy storage, in particular to a cryogenic liquid air energy storage system for air interstage cooling. Background technique [0002] Cryogenic liquefied air energy storage technology refers to the use of electric energy for compressed air during the low load period of the grid, and the high-pressure sealing of the air in abandoned mines, subsidence subsea gas storage tanks, caves, expired oil and gas wells or newly built gas storage wells. The energy storage method releases compressed air during the peak period to drive the steam turbine to generate electricity. The liquid air energy storage system has the advantages of large energy storage capacity, long energy storage period, small footprint and does not depend on geographical conditions. During energy storage, the electric energy compresses, cools and liquefies the air, and at the same time stores the heat energy released dur...

AI Technical Summary

Problems solved by technology

[0003] However, the existing cryogenic liquefied air energy storage system still has the following defects: the cryogenic liquefied air energy storage system is easily affected by many factors such as environment, equipment, and energy loss, resulting in low cycle energy storage efficiency and high operating costs. High, so it is necessary to provide a high-efficiency, low-cost cryogenic liquid air energy storage system

Images