Sustainable Mining and Metallurgy

In order to carry out the comparison and optimization of physical energy storage methods in underground space of abandoned mines, on the basis of summarizing and analyzing the principles and development status of pumped storage, gravity energy storage and compressed air energy storage in abandoned mines, the analytic hierarchy process was used to select 6 first-level indicators, 19 second-level indicators and 3 energy storage schemes, and the evaluation index system of physical energy storage methods in underground space of abandoned mines was established. Taking Baijiazhuang Coal Mine in Shanxi Province as an example, based on the expert scoring method, the weights of each index and scheme layer are analyzed, and the main control factors and influence degree of the primary and secondary indicators in the evaluation system are obtained. Based on this analysis, the advantages and disadvantages of three physical energy storage methods are compared. The results show that among the first-level indicators, the weight of safety and security is the highest, followed by environmental impact, an then resource conditions, economic benefits, energy consumption level, and finally technical solutions. Among the secondary indicators, the three indicators with the highest weight are technical support, natural ecology and capital investment; among the three schemes, gravity energy storage has the most advantages, followed by pumped storage, and finally compressed air energy storage. The research results can provide reference for the selection of physical energy storage methods in underground space of abandoned mines.