Study On Heat Transfer Law Of Gas Storage Chamber For Compressed Air Energy Storage Systems

Compressed air energy storage technology has been developed rapidly because of its large energy storage capacity,rapid response,high energy storage efficiency,and is expected to become one of the important options to solve the problem of large-scale renewable energy development and utilization.There are many factors that affect the performance of compressed air energy storage system under all operating conditions and dynamic conditions.Among them,the thermodynamic characteristics of the working fluid and the heat transfer characteristics of the gas storage chamber have obvious impact on the operation performance of the system.In order to further reveal the thermodynamic characteristics and heat transfer law of the gas storage chamber under different internal and external influence factors,a three-dimensional numerical model of the gas storage chamber is established.the measurement platform of the heat transfer law of the gas storage chamber is built,and the heat transfer law of the gas storage chamber under the influence of multiple factors is studied by the combination of CFD numerical simulation and experimental research.The main research contents are as follows:(1)Taking the above ground gas storage chamber as the research object,the three-dimensional unsteady mathematical model of compressed air energy storage system in the process of energy storage is established,and the model is verified by the experimental data.On this basis,the effects of different ambient temperature,gas flow rate,swept wind velocity and surface characteristics of gas storage chamber on the outer wall temperature,the working fluid temperature and pressure of the gas storage chamber are quantitatively analyzed.(2)Based on the real time heat transfer measurement device on the gas storage chamber,the real time heat transfer law and the heat flux distribution on the gas storage chamber of the compressed air energy storage system under the influence of complicated factors are established.The real time heat flux density and the real time external heat transfer law of the gas storage chamber in the process of charging and discharging,and the real time heat transfer law of the gas storage chamber under different internal and external influence factors is clarified.(3)The influence of the operation mode,the external environment and the characteristics of the chamber on the wall of gas storage chamber is analyzed quantitatively,and the sensitivity of the related factors is analyzed.The sensitive factor sequence of each influencing factor to the real-time heat transfer and real-time total heat transfer on the wall of the gas storage chamber and the total heat storage on the wall of the gas storage chamber are obtained.And the influence degree of each factor on the heat transfer law of the gas storage chamber is determined.