Temperature response and local high temperature control method for the first inflation of underground cavern in compressed air energy storage power station
In order to explore the type of underground cavern with compressed air energy storage from the perspective of thermodynamics,a numerical model of the first inflation and pressurization process of the cavern considering turbulence,heat transfer and real air characteristics is established,by using the computational fluid dynamics(CFD)method.The effects of different length-diameter ratios and inlet diameters of inflatable pipes on temperature rise of gas and lining materials in the cavern and the temperature distribution in the cavern are studied,and the control measures are put forward for the local high temperature phenomenon in the cavern.The main conclusions are as follows.When the length-diameter ratio is small(large tank gas storage),the temperature distribution in the cavern is relatively uniform.With the increase of the ratio of length to diameter(tunnel-type gas storage),the temperature distribution in the cavern appears stratification phenomenon,and the extremely high temperature zone appears at the end of the cavern(stuffy top effect).The temperature rise of the steel plate sealing layer is the largest in the process of inflation and pressurization of the cavern,the temperature change of the concrete lining is small,and the surrounding rock is almost not affected by temperature change in the cavern.Reducing the inlet diameter of the inflatable pipe can reduce the temperature in the cavern to a certain extent and promote the outward heat transfer.For the annular tunnel type cavern,the proposed improved inflation method can make the temperature distribution in the cavern uniform,avoid the stuffy roof effect,and provide a useful reference for engineering design.
compressed air energy storageunderground gas storage caverncavern typetemperature distribution
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