耦合太阳能辅热的AA-CAES系统参数分析

Parameter Analysis of an AA-CAES System Coupled with Solar Auxiliary Heating

为提高传统先进绝热压缩空气储能(AA-CAES)系统性能,在原系统上耦合了太阳能辅热子系统,并对耦合太阳能辅热的AA-CAES系统性能进行了研究。结果表明:在相同压缩机级数下,冷罐和热罐温度均随膨胀机级数的增加缓慢升高;在相同膨胀机级数下,冷罐和热罐温度随压缩机级数的增加逐渐降低;当压缩机与膨胀机级数相等时,系统储能效率、储能密度和耦合储能效率均比二者级数不等时更高;随着换热器效能的提高,系统冷罐和热罐温度升高、膨胀功和压缩功增大,而系统储能效率和耦合储能效率先提高后降低。

To improve the performance of an advanced adiabatic compressed air energy storage(AA-CAES)system,a solar auxiliary heating subsystem was coupled to the original system,and subsequently,a study was conducted on the performance of the newly coupled system.Results show that at a fixed number of compressor stages,the temperature of cold and hot tanks increases slowly with the rising number of turbine stages,while at a fixed number of turbine stages,the temperature of cold and hot tanks decreases with the rising number of compressor stages.When the number of compressor stages is equal to that of turbine stages,the energy storage efficiency,the energy storage density and the coupled energy storage efficiency of the system would be higher than the case the two numbers are not equal.With the enhancement of heat exchanger effectiveness,the temperature of cold and hot tanks,the expansion work and the compression work increase,while the energy storage efficiency and the coupled energy storage efficiency of the system increase first and then decrease.