回热式压缩空气储能系统改造与分析

Retrofit and Analysis of Recuperative A-CAES System

为降低储热介质成本,基于以矿物油储热的绝热压缩空气储能系统（A-CAES）,增设供热压缩机以降低储热温度,进而提出以水为储热介质的新型热电冷联产的压缩空气储能系统。建立改造后的系统模型,采用热力学方法对设计工况下两系统进行了计算,比较了供热压比（2.4~3.8）与换热器效能（0.6~0.9）变化时热电冷联产系统的性能参数。结果表明,热电冷联产系统的储热温度大幅降低,实现了储热介质的改变;与原系统相比,热电冷联产系统电耗率基本不变,热效率、效率分别提高约14%、2.6%;供热压比变化对系统性能及设备损影响较小,换热器效能变化对系统效率、损有显著影响。

To cut down the cost of thermal energy storage（TES） medium, the heating compressor is appended to the mineral oil-based adiabatic compressed air energy storage（A-CAES ） system to lower the TES temperature. Furthermore, a novel compressed air energy storage （CAES） system for combined cool, heat and power （CCHP） taking water as the TES medium is proposed. The thermodynamic model of the system is then established such that the thermodynamic calculations are conducted for two systems under designed operation conditions. In particular, the CCHP system performance parameters are computed and compared with the variation of heating pressure ratio （2.4~3.8） and heat exchanger efficiency（0.6~0.9） respectively. The results show that the TES temperature of the CCHP system is significantly reduced with the new water-based TES medium. Compared with the original system, the thermal efficiency and exergy efficiency are improved by about 14% and 2.6% respectively, while the ER remains almost unchanged. In addition, the impact of heating pressure ratio on system performance and exergy losses of the equipments is very minimum while the effectiveness shows significant impacts on system efficiency and exergy losses.