10MW级压缩空气储能地下人造硐室充放气过程数值仿真研究

Numerical Simulation Study on Charging and Discharging Processes of an Underground Artificial Cavern in a 10 MW Compressed Air Energy Storage System

通过仿真软件建立了10 MW级压缩空气储能地下人造硐室热力学模型,按照国内某压缩空气储能项目给出了地下人造硐室压缩空气储能循环充放气物理过程的边界条件,开展了网格无关性和时间步长独立性检验,对系统单次充放电循环运行过程的地下人造硐室内气体热力性能进行了动态分析。结果表明:人造硐室在充气-静置-放气-静置的过程中,硐室内部的压力和温度随时间的变化规律均为升-降-降-升;硐室内部压力均匀分布,硐室内部温度呈稳定的阶梯状分布,上侧空间的气体温度高于下侧空间的气体温度;受到重力的影响,井筒入口处的压力低于井筒底部的压力;在放气的末尾阶段至放气结束后的第二次静置过程中,硐室空间均存在一定的负温空间,这不利于硐室稳定运行。

The thermodynamic model of an underground artificial cavern in a 10 MW compressed air energy storage(CAES)system was developed with a simulation software.The boundary conditions of charging and discharging physical processes for the CAES cycle of the underground artificial cavern were given according to a domestic CAES project.The mesh independence and time step independence tests were carried out.The dynamic analysis of the gas thermal properties in the underground artificial cavern during the single charging-discharging cycle process was carried out.Results show that the pressure and temperature in the artificial cavern change with time are all rising-falling-decreasing-rising during the process of charging,standing,discharging,and standing.The pressure inside the cavern is evenly distributed,the temperature inside the cavern is stable and step-like,and the gas temperature in the upper space is higher than that in the lower space.Affected by the gravity,the pressure at the wellbore inlet is lower than that at the wellbore bottom.From the discharging end to the second standing process after the discharging end,a certain negative temperature space exists in the cavern space,which is not conducive to the stable operation of the cavern.