压气储能浅埋地下储气库性能试验研究

利用地下岩穴进行压缩空气储能是大规模能源存储的可行方式之一。压缩空气地下储存库建设的核心任务是保证储气库的密封性和洞室结构安全性。为了验证浅埋地下储气库的可行性，在湖南平江抽水蓄能电站勘探平硐的花岗岩地层内建造了国内第1个硬岩浅埋衬砌地下储气室，并进行了10次完整的压缩空气充放气循环试验。试验结果表明：储气室内压缩空气温度场呈现出显著不均匀分布的特性，温控系统可以有效地控制储气室的温度变化过程。长时高压储气条件下，试验库的漏气率约为充气率的3.2%，试验库密封性能良好。在8.7 MPa的内压作用下围岩的最大变形量只有0.35 mm左右，高内压引起的变形影响区在10 m范围内，围岩变形安全性良好。试验成果有助于全面深入地认识高压地下储气库的工作性能，并为压气储能地下储气库的设计提供有益参考。

Experimental study on performance of shallow rock cavern for compressed air energy storage

Using rock cavern for compressed air energy storage is a promising method for large-scale energy storage. Ensuring the sealing performance and structural safety of the storage cavern are the core tasks in such construction. To verify the feasibility of shallow rock cavern, a lined cavern within granite stratum was constructed in an exploratory tunnel in Pingjiang pumped storage power station, Hunan, as the first compressed air energy storage in China. The cavern was subjected to 10 cycles of charge and discharge during the test. The test results show that the temperature of the compressed air exhibits a significantly uneven distribution, and the evolution of the temperature can be effectively controlled by the heat exchange system. The leakage rate of the chamber is about 3.2% under the long-term high-pressure condition, implying that good sealing performance is achieved. The maximum deformation of surrounding rock is about 0.35 mm under an internal pressure of 8.7 MPa, and the deformation affected zone caused by high internal pressure is within 10 m, indicating that the surrounding rock is safe. The results can help understand the working performance of underground high-pressure gas storage and can provide a reference for the design of compressed air energy storage in shallow rock caverns.