Thermo-electric Characteristic Analysis of Distributed Advanced Adiabatic Compressed Air Energy Storage for Integrated Energy System

Abstract

The advanced adiabatic compressed air energy storage (AA-CAES) technology has attracted increasing attention in integrated energy system due to its heat-electric co-storage and co-supply advantage. However, the miniaturization of AA-CAES system has become the key factor limiting its flexible application in integrated energy system. Aiming at the miniaturization technology bottleneck of AA-CAES, this paper proposes distributed advanced adiabatic compressed air energy storage (DAA-CAES) system which based on single-stage relay compression, single-stage relay turbine, multi-tank ladder pressure gas storage and single-tank heat storage architecture. On this basis, a simulation model of DAA-CAES system is established, and the influence of key parameters such as compressor pressure ratio, turbine expansion ratio, throttling pressure difference, and gas storage unit volume on system performance was analyzed. The results show that: (1) increasing the compressor pressure ratio, turbine expansion ratio and reducing the throttle pressure difference are helpful to improve the power generation efficiency of the system. (2) when the low-pressure gas storage tank adopts large volume gas storage tank unit, the power generation efficiency of the system is higher. (3) when the high-pressure gas storage tank adopts large volume gas storage tank unit, the heating efficiency of the system is higher.