Novel concept and stability analysis of pipe layout type abandoned mine compressed air energy storage technology

The utilization of abandoned mines to build compressed air energy storage (CAES) power stations can fully utilize land and space resources and reduce excavation costs. It possesses substantial economic and ecological advantages and has garnered widespread attention in recent years. Therefore, the construction of CAES for gas storage is introduced, the development prospects are systematically analyzed, the advantages and existing problems of CAES in abandoned mines are discussed, and then a novel pipe layout design for CAES technology in abandoned mines is proposed (using large-diameter seamless steel pipe as gas storage space, adding loose filling bodies into the gaps to hold pressure).Numerical simulations were conducted to analyze the surrounding rock stability and structural deformation under long-term creep loads for different types of gas storage. The results indicate that this scheme has the following advantages: ① it reduces the site selection requirements of the power station and increases the site selection range; ② it reduces the difficulty of constructing gas storage facilities; ③ it avoids the risk of gas leakage; and ④ it avoids the impact of corrosion on the gas storage facility, which increases its durability. This study provides novel ideas for the development of abandoned mine CAES technology and has the potential for large-scale promotion and application.