AA-CAES+CSP系统运行策略研究

STUDY ON OPERATION STRATEGY OF AA-CAES+CSP SYSTEM

为深入研究带太阳能辅热的先进绝热压缩空气储能(AA-CAES+CSP)系统热力学性能,建立系统关键部件热力学模型,利用Matlab模拟计算,分析辅热子系统加入方式及外界因素对系统性能影响。结果表明:首次启动,以空气先流经储能蓄热子系统再流经辅热蓄热子系统运行效果更佳,而长久稳定运行,则以空气先流经辅热蓄热子系统再流经储能蓄热子系统运行效果更佳;稳定工况下,集热温度越高,循环效率和储能密度越大,但过高的集热温度会使循环蓄热介质温度过高,当超过其临界温度时,会由液态变为气态,导致换热效果变差,影响换热器性能;在研究参数范围内,环境温度越低,循环效率越高;任一系统均有一个使循环结束后,储气室无需借助外部作用,其压比和温度就自行恢复至初始值的循环稳定间隔时间。

In order to further study the thermodynamic performance of advanced adiabatic compressed air energy storage system with solar auxiliary heating(AA-CAES +CSP),thermodynamic models of key components are established,and the effects of the addition methods of auxiliary heating subsystem and external factors on system performance are analyzed by Matlab. The results show that for the first cycle,it’s better that air firstly flows through the heat exchanger of CSP system and then through AACAES system’s. But for stable operation,the opposite flow is better;Under stable conditions,the higher collector temperature is,the greater cycle efficiency and energy storage density are. However,too high collector temperature will cause too high temperature of heat carrier. In addition,carrier will change to be gas,heat exchange effect becomes poor,and heat exchanger performance is affected when critical temperature is exceeded. In the range of research parameters,the lower ambient temperature causes the higher circulation efficiency. Each system has a stable interval time that pressure ratio and temperature of air storage chamber return to initial values without external action at the end of cycle.