AA-CAES+CSP系统性能及关键参数分析

为深入分析耦合太阳能辅热的先进绝热压缩空气储能(AA-CAES+CSP)系统的运行特性,在先进绝热压缩空气储能(AA-CAES)系统基础上建立相关模型,对比分析这2个系统性能,并探究关键参数对AA-CAES+CSP系统性能影响。结果表明:相比于AA-CAES系统,AA-CAES+CSP系统循环效率提高7.90%,储能密度提高4.46%;当压缩机级数N1=膨胀机级数N2=级数N时,循环效率和储能密度最高,N1与N2相差越小,系统性能越优;随着储气室对流换热系数hc的增大,循环效率先大幅度降低,后缓慢增大,储能密度则持续增大,且在hc较小时,N越大,循环效率越低,而当hc较大时则相反,储能密度则随N的增大而持续增大,但N越大,同一hc对系统性能的影响越小;循环效率随储气室最大压比的增大而减小,储能密度则相反,且在最大压比较小时,N越大,循环效率越小,储能密度越大,但当N较大时,N越大,循环效率和储能密度均越大。

ANALYSIS ON PERFORMANCE AND KEY PARAMETERS OF AA-CAES+CSP SYSTEM

In order to further analyze the operation characteristics of advanced adiabatic compressed air energy storage sytem assisted by concentrating solar power(AA-CAES+CSP)system,the relevant model is established on the basis of AA-CAES system,performance of two systems is compared with each other,and the effects of key parameters on the performance of AA-CAES+CSP system are investigated.The results show that compared with AA-CAES system,cycle efficiency of AA-CAES+CSP system increases by 7.90%and energy storage density increases by 4.46%.When the number of compression stage N1 is equal to the number of expansion stage N2,the cycle efficiency and energy storage density are the highest.In addition,the smaller the difference between N1 and N2 is,the better system performance is.With the increase of heat transfer coefficient hc,cycle efficiency firstly drops and then slowly increases,and energy storage density continuously increases.When hc is relatively small,the larger the number of system stage N is,the lower cycle efficiency hc is.However,the opposite thing happens when hc is relatively large,but energy storage density continues to increase with N.In addition,the larger N is,the smaller the impact of hc on system performance is.When maximum pressure ratio of air storage chamberβmax increases,cycle efficiency decreases and energy storage density increases.In addition,whenβmax is relatively small,the larger N is,the lower cycle efficiency is and the larger energy storage density is.However,whenβmax is relatively large,cycle efficiency and energy storage density increase with N.