等温压缩空气储能系统液气传热特性研究

Study on Liquid-gas Heat Transfer Characteristics of Isothermal Compressed Air Energy Storage System

等温压缩空气储能(I-CAES)无需补燃、能源利用率高且碳排放低,在大规模储能领域具有重要应用前景。在建立喷雾的I-CAES系统的液气传热模型基础上,通过数值方法分析了喷雾流量对I-CAES液气传热特性的影响规律。结果表明:采用喷雾方法能够有效抑制压缩和膨胀过程的温度变化、强化液气传热并实现理想I-CAES过程;增大喷雾流量能够降低压缩功耗、提高膨胀做功并降低停机储气过程压损,可提高系统指示效率和储能效率。

Isothermal compressed air energy storage(I-CAES)has an important application prospect in large-scale energy storage field due to its advantages of high energy utilization rate,low carbon emission and no need for supplemantary combustion.The liquid-gas heat transfer model of sprayed I-CAES system was established,and the influence rule of spray flow rate on liquid-gas heat transfer characteristics of ICAES was analyzed by using the numerical method.The results show that the adoption of spray can effectively suppress the temperature variation in the compression and expansion process,which is an effective measure to enhance the liquid-gas heat transfer and achieve ideal I-CAES process.Increasing spray flow rate can reduce compression power consumption,increase the expansion work output,reduce pressure loss during shutdown and air storage stage,and finally improve the indication efficiency and energy storage efficiency of the system.