液化空气储能与发电一体化系统的性能分析

PERFORMANCE ANALYSIS ON AN INTEGRATED SYSTEM OF LIQUEFIED AIR ENERGY STORAGE AND ELECTRICITY PRODUCTION

运用热力学理论建立液化空气储能阶段和释能发电阶段的数学模型,采用循环效率和液化率作为评价指标探讨压缩机组出口压力p4、低温泵出口压力、换热器效能、空气节流前温度和空气节流前压力对液化空气储能与发电一体化系统性能的影响规律。结果表明:提高低温泵出口压力与换热器效能,能显著增大系统循环效率;提高压缩机组出口压力p4,压缩机比耗功与膨胀机比输出功均增大,而系统循环效率有所降低;空气节流前压力越大、温度越低,节流后的液化率越大,循环效率越高。理论分析模型和研究结果可为液化空气储能与发电一体化系统的发展提供参考。

The mathematical model including the stages of energy storage and energy release is established by using the thermodynamic theory.The effects of compressor outlet pressure,cryogenic pump outlet pressure,heat exchanger efficiency,temperature and pressure before air throttling on the performance of integrated system of liquefied air energy storage and electricity production were studied by using cycle efficiency and liquefaction rate as evaluation indexes.The results show that increasing the cryogenic pump outlet pressure and heat exchanger efficiency can significantly increase the cycle efficiency of the system;improve the compressor outlet pressure,compression work and turbine power were increased,and the cycle efficiency decreased;the greater air pressure and the lower air temperature before throttling,the greater liquefaction rate after throttling,and the higher cycle efficiency.The theoretical analysis model and research results can provide a reference for the development of the integrated system of liquefied air energy storage and electricity production.