压缩空气储能具有建设成本低、设备占地面积小、储能周期长以及环保等优点，探索地下空间压缩空气储能技术发展是实现我国“双碳”目标的创新途径之一，地下空间储能库可分为盐穴、含水层、枯竭油气田、废弃煤矿及岩洞储能库。随着国内废弃煤矿数量逐年增多，直接将资源枯竭的煤矿关闭不仅造成巨大的地下空间资源浪费，还极有可能诱发一系列的安全、环境等问题，利用废弃煤矿地下空间作为压缩空气储能电站储能库具有很好的应用前景。基于此，系统梳理了我国废弃煤矿地下空间资源利用情况，阐述了废弃煤矿地下储能库建设、地下储能库密封性和稳定性的研究现状，着重介绍了废弃煤矿地下空间压缩空气储能的研究进展与存在问题。分析表明：①废弃煤矿有大量可利用空间，总结了废弃煤矿地下空间的8种再利用模式：农林用地、建设用地、场地绿化、水域利用、水热联用、湿地公园、矿山公园、空间再利用；②我国废弃煤矿压缩空气储能的研究起步晚，基础理论研究薄弱，关键技术不成熟，且煤矿地质条件复杂，相关应用基础研究不足，尚未实现商业化、规模化推广应用；③总结提出了应对废弃煤矿压缩空气储能的三项关键技术，即废弃煤矿储能库建设选址评估方法、废弃煤矿储能库密封性关键技术、废弃煤矿储能库稳定性与安全评价；建立了废弃煤矿压缩空气储能库建设选址流程图。

Compressed air energy storage (CAES) has the advantages of low construction cost, small equipment footprint, long storage cycle and environmental protection. Exploring the development of CAES technology in underground space is one of the innovative approaches to achieve China’s “dual-carbon” goal. Underground energy storage reservoirs can be classified into salt caverns, aquifers, depleted oil and gas fields, abandoned coal mines, and caverns. With the increasing number of abandoned coal mines in China, the direct closure of resource-depleted coal mines not only cause a significant waste of underground space resources, but also induce a series of safety, environmental and other issues. Therefore, utilizing the underground space of abandoned coal mines as CAES reservoirs holds great application prospects. The analysis shows that, ① There is a large amount of usable space in abandoned coal mines, and eight reuse modes of underground space in abandoned coal mines have been summarized: agricultural and forestry land, construction land, site greening, watershed utilization, water-heat combination, wetland park, mine park, and space reuse. ② The research on CAES in abandoned coal mines in China started late, the basic theoretical research is weak, the key technologies is immature, and geological conditions in coal mines are complex, the relevant applications of basic research is insufficient, and the commercialization, large-scale promotion and application have not yet been achieved. ③ Three key technologies are summarized and proposed to cope with the CAES in abandoned coal mines, i.e., the evaluation method of site selection for the construction of abandoned coal mine energy storage reservoirs, the key technology for the sealing of abandoned coal mine energy storage reservoirs, and the stability and safety evaluation of abandoned coal mine energy storage reservoirs. A flowchart for siting the construction of CAES reservoirs in abandoned coal mines has been established.