矿产与地热资源共采模式研究现状及展望

Co-mining of mineral and geothermal resources: A state-of-the-art review and future perspectives

  • 摘要: 地热能作为一种绿色清洁且储量巨大的可再生能源,在降低矿产资源深部开采成本方面具有显著优势和发展潜力。充分利用深部岩体中蕴藏的地热能,不仅可以有效缓解矿产资源开采中的热害难题,而且有利于促进我国能源产业的绿色低碳和可持续发展。在梳理当前可能伴生有地热资源的矿产资源基础上,对现有的矿−热资源共采技术进行了回顾和总结,分析展望了未来矿−热资源共采的新模式,介绍了基于卤水循环系统的矿−热资源共采、基于开挖技术的矿−热资源共采、基于充填采矿法的矿−热资源共采、基于溶浸采矿法的矿−热资源共采和基于废弃矿井再利用的矿−热资源共采等技术方案,同时指出了矿−热资源共采所面临的主要挑战,包括加强矿−热共同赋存区勘探、发展深部高温坚硬岩层破岩与掘进技术、加强深部多场耦合环境岩石力学理论与试验研究、建立矿−热资源共采热能分级利用体系。相关研究成果旨在释放矿产资源开采中的地热能发展潜力并促进地热资源的规模化利用,可为我国深部矿产资源开采和地热资源开发提供有益的参考和借鉴。开展矿产与地热资源共采战略研究,有望为推进我国深部资源开发和实现“碳达峰、碳中和”的双碳目标提供一条有效途径。

     

    Abstract: With the continuous increase in mining depths for mineral resources, the high-temperature thermal damage caused by deep earth temperatures has become a critical factor that restricts the safe and efficient mining of mineral resources. High-temperature environments directly affect the health of underground operators and reduce the service performance and lifetime of underground facilities and equipment. These high temperatures not only restrict mining efficiencies but also are a major safety hazard. However, the existing shaft facilities and abundant heat in the deep layers of mines provide favorable conditions for the large-scale development and utilization of geothermal energy. As clean and renewable energy, geothermal energy has significant advantages and great potential to reduce the cost of the deep mining of mineral resources. Making full use of geothermal energy stored in deep rock masses can not only effectively alleviate heat damage in mineral resource mining but also can promote the green, low-carbon, and sustainable development of the energy industry. To categorize mineral resources that may be associated with geothermal resources, here, we review and summarize existing mineral–geothermal co-mining technologies, i.e., the mine water source heat pump system, high-temperature exchange machinery system, deep salt mine geothermal extraction system, and oil and gas field geothermal energy comprehensive utilization project. Future modes, i.e., co-mining based on a brine circulation system, excavation technology, the filling mining method, in situ leaching method, and reuse of abandoned mines, are also analyzed. Moreover, the main challenges faced during the co-mining are discussed, including strengthening the exploration of the co-mining areas with mineral–thermal resources, developing rock breaking and tunneling technology for deep high-temperature hard rocks, strengthening the theoretical and experimental research of deep multifield coupled environmental rock mechanics, and establishing a graded utilization system of thermal energy for the co-mining of mineral–thermal resources. These research results are aimed at promoting geothermal energy development in the mining of mineral resources to benefit the large-scale utilization of geothermal resources and can provide a useful reference for the mining of deep mineral resources and the development of geothermal resources in China. Furthermore, promoting mineral–geothermal co-mining can promote the development of China’s deep resources to achieve the double carbon goal of “carbon peaking and carbon neutralization.”

     

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