基于工质相变的变容储气A-CAES系统技术经济性分析OA

Adiabatic compressed air energy storage (A-CAES) systems commonly employ constant-volume gas storage,leading to incomplete air release from the storage vessel,resulting in challenges such as low energy storage density and high unit storage cost. To address this issue,a variable-volume gas storage A-CAES system based on working medium phase transition is proposed,which utilizes external working medium pressure to ensure complete air release from the storage device. However,adopting variable-volume gas storage increases the complexity of the storage system and equipment investment costs. Therefore,the technical and economic analysis of the variable volume gas storage A-CAES system based on the CO2 phase change of the working fluid is carried out in this paper,and compared with the constant volume gas storage A-CAES system. The results indicate that the energy storage density of the variable-volume gas storage A-CAES system based on working medium phase transition is 28.30 MJ/m3,which is 83.65％ higher than that of the constant-volume gas storage A-CAES system. The variable volume gas storage method can reduce the unit gas storage cost from 49.17 yuan/kg to 36.59 yuan/kg. Over the entire operational period,the dynamic payback period and net present value of the variable-volume gas storage A-CAES system are 7.36 years and 1.01 billion yuan,respectively,which is 1.45 years less and 38.32 million yuan more than that of the constant-volume gas storage A-CAES system.