Numerical Simulation Study On The Stability Of Compressed Air Energy Storage Cavity

With the development of China’s economy,the demand for electricity is increasing,and the problem of ensuring the power supply in the peak period of electricity consumption is being paid more and more attention.To meet the growing demand for power and reduce the impact on the environment,the state has vigorously developed power facilities based on clean energy.But clean energy generation is intermittent,and it’s difficult to grid.Therefore,the compressed air energy storage(CAES)technology with salt cavern as the gas storage facility has been explored at home and abroad.The development of salt cavern CAES demonstration project based on Jintan salt cavern gas storage will fill the gap of large-scale energy storage and storage in China,so as to study the feasibility of domestic construction of salt cavern energy storage power station.The main contents of this paper are as follows:1.Starting from the conservation of energy and mass conservation,we obtain that the pressure of the chamber varies linearly with time in the injection and production stage when the ideal gas is injected into the cavity at constant mass flow under adiabatic condition.2.The difference between domestic salt mines and foreign salt mines is compared.Considering the characteristics of deep buried,interlayer conditions,high injection and production frequency and large pressure drop rate,a numerical simulation model for simulating the stability of compressed air storage cavities is established by using Ansys and FLAC3 D.3.Taking a well in Mau Xing block,Jintan as an example,the influence of pressure interval and interlayer condition on the stability of the cavity is analyzed by numerical simulation.The numerical simulation results show that the volume contraction rate of the cavity is maximum 3.13% after 30 years of operation,and it isconsidered that the construction station meets the requirement from the volume contraction angle.Under the same conditions,when the minimum gas pressure is constant,improve the high-pressure gas pressure,the cavity stability evaluation index is getting better.The ratio of the distance between the adjacent cavities and the diameter of the cavity is more than 1.8 when the two cavities are needed,and the length of the reserved neck of the cavity top should be between 5m-10 m.These parameters can provide references for the screening of energy storage electric cavities.4.Analysis of the gas pressure under the condition of domestic salt cavity efficiency,that in the domestic salt conditions,the gas pressure range at high gas pressure ratio(the ratio of high pressure gas pressure and low gas pressure)is only 1.3,appropriately increasing the gas pressure ratio,improve the utilization rate.