Thermal Changes in Pipeline Steel Gas Storage Process and Its Influence on Compressed Air Energy Storage Characteristics

Since the pressure and temperature of the compressed air in the gas storage are constantly changing during gas storage process in the compressed air energy storage system, which directly affects the output power of the compressor and the actual gas storage capacity, the temperature rise effect of the compressed air under adiabatic condition of 15 m pipeline steel was analyzed by numerical solution of differential equation, taking a gas storage of pipeline steel as an example. And Fluent was used for simulation verification. Considering the temperature rise of the pipeline steel and different heat transfer conditions, the thermal calculation for the gas storage process of the long-distance pipeline steel of 3 024 m was carried out. The coupling calculation of the gas storage process and the work process of the compressor was processed to obtain the change rules of the pressure and temperature of the compressed air in the gas storage process, the output power of the compressor, the actual gas storage capacity of the gas storage and other parameters. Results show that the mass mean temperatures of the compressed air at the end of inflation were 315.39 K, 311.65 K, 301.52 K and 291.35 K, and the gas storage capacities were 244.64 t, 252.60 t, 275.77 t and 301.35 t, when the comprehensive heat transfer coefficients of 0 W/(m²·K), 1 W/(m²·K),5 W/(m²·K) and 25 W/(m²·K) were adopted respectively.