Thermodynamics Performance and Efficiency Analysis of Compressed Air Energy Storage System Considering Gas Tightness of Gas Storage

Using abandoned cavern as gas storage can significantly reduce the construction cost of large-scale compressed air energy storage system, but the air tightness of cavern gas storage will significantly affect the gas storage performance. In order to study the effect of air tightness on the thermodynamic performance and efficiency of compressed air energy storage system, a mathematical model of compressed air energy storage system is established by considering cavern gas storage with different concrete lining thickness, and the trend of the thermodynamic performance and efficiency of compressed air system with the time of gas storage is obtained. The results show that, taking the compact limestone cave selected in this paper as an example, when concrete lining is not used, the amount of gas leakage has a greater impact on the system efficiency, and it is not suitable to be directly used as a gas storage for compressed air energy storage and power generation. The use of concrete lining can greatly reduce the gas leakage of gas storage and alleviate the decrease of system efficiency caused by leakage, but the alleviation effect decreases gradually with the increase of lining thickness.