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废弃矿井压缩空气储能技术研究现状与新设计构想

Research status and new design concept of compressed air energy storage technology in abandoned mine

  • 摘要: 压缩空气储能(Compressed Air Energy Storage,CAES)可广泛应用于电网削峰填谷和大规模新能源消纳,具有装机容量大、使用寿命长、清洁环保等优点,被视为最有前途的大规模储能技术之一。目前国内外主要依托层状盐穴或盐丘来建设CAES储气库,但由于选址条件苛刻等原因,CAES产业的发展受到了极大限制。近年来,随着国内矿井的大量关闭,许多地下空间资源被浪费,因此利用废弃矿井建设CAES电站就具有了巨大的生态经济效益与广袤的发展前景。系统梳理了CAES各类储气库建设现状与优缺点,总结了废弃矿井CAES储气库的建设与选址要求,分析了当前废弃矿井CAES储气库面临的安全风险与限制瓶颈。为避免CAES储气库建设与运营过程中存在的安全风险,提出了新的储气库建设方案——管道布设型废弃矿井储气库(利用大直径无缝钢管作为储气空间,缝隙内填充松散充填体进行承压),与传统储气库建设方案相比,该方案具有以下优势:① 极大降低了储气库对矿区地质构造、围岩渗透性、围岩稳定性等条件的选址要求,增加了选址范围;② 可利用现有管道施工工艺与技术装备,降低储气库建设难度;③ 提高了储气库的密封性能,保障无气体泄漏风险;④ 改善了围岩应力环境,提高了储气库稳定性;⑤ 避免储气库受腐蚀影响,增加了储气库的耐久性能。最后以鄂庄废弃煤矿为例,给出了管道布设型储气库改造建设方案,储气库改造建设完成后,总容积可达4.5×105 m3,发电功率可达400 MW,可产生良好的经济效益 。管道布设型废弃矿井储气库设计构想为废弃矿井CAES技术发展提供了新思路,具有大规模推广应用的潜力。

     

    Abstract: Compressed air energy storage(CAES) can be widely used in power grid peak load shifting and large-scale new energy consumption. It has the advantages of large installed capacity, long service life, and clean environmental protection, and is regarded as one of the most promising large-scale energy storage technologies. Currently, CAES gas storage are mainly built based on layered salt caverns or salt dome. However, due to strict site selection conditions and other reasons, the development of the CAES industry is greatly limited. Recently, with the closure of a large number of mines, many underground space resources have been wasted. Therefore, using abandoned mines to build CAES power stations has enormous ecological, economic benefits and vast development prospects. This paper systematically sorts out the construction status, advantages and disadvantages of various CAES gas storages, summarizes the construction and site selection requirements of CAES gas storages in abandoned mines, and analyzes the safety risks and limiting bottlenecks faced by CAES gas storages in abandoned mines. In order to avoid the safety risks in the construction and operation of CAES gas storage, we put forward a new gas storage construction scheme “pipeline layout type abandoned mine gas storage (using large diameter seamless steel pipeline as gas storage space, filling loose filling body in the gap to bear pressure)”. Compared with traditional gas storage construction scheme, this scheme has the following advantages: ① Greatly reduces the site selection requirements of CAES gas storage for geological structure, surrounding rock permeability, surrounding rock stability and other conditions in the mining area, and increases the site selection range; ② Existing pipeline construction processes and technical equipment can be utilized to reduce the difficulty of constructing gas storage; ③ Improve the sealing performance of CAES power station gas storage to prevent gas leakage; ④ Improve the stress environment of surrounding rock and the stability of gas storage; ⑤ Avoid the impact of corrosion on the gas storage increases its durability. Finally, takes Ezhuang abandoned coal mine as an example, this paper gives the reconstruction and construction scheme of pipeline layout gas storage. After the reconstruction and construction of gas storage is completed, the total volume can reach 4.5×105 m3, and the power generation can reach 400 MW, which can produce good economic benefits. The pipeline layout type abandoned mine gas storage provides a new idea for the development of CAES technology in abandoned mines, it has the potential for large-scale promotion and application.

     

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