The Concept, Technical System and Heat Transfer Analysis on Phase-Change Heat Storage Backfill for Exploitation of Geothermal Energy
The Concept, Technical System and Heat Transfer Analysis on Phase-Change Heat Storage Backfill for Exploitation of Geothermal Energy
复制标题
相变蓄热充填地热能开发理念、技术体系及传热分析
DOI：
10.3390/en13184755
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发表时间：
2020
期刊：
影响因子：
3.2
通讯作者：
Song KI-IL
中科院分区：
文献类型：
--
作者：
Zhang Xiaoyan;Xu Muyan;Liu Li;Liu Lang;Wang Mei;Ji Haiwei;Song KI-IL
针对深部矿产资源开采中存在的高地应力、高地温、热害等问题，提出了相变蓄热充填体的概念。在此基础上，构建了相应的技术体系，并对技术体系中涉及的主要内容--相变材料充填料浆的优化配比进行了研究。阐述了充填体力学性能和热性能的协同优化以及充填开采、地热能开采和采场同步冷却的相互配合。充填体的传热性能在工艺系统中起着关键作用。数值模拟了蓄热过程中充填体、围岩和气流之间的传热，以及放热过程中充填体与冷流体之间的传热。回填体在不同储热/放热时间下的温度分布，揭示并分析了温度分布及其随传热的演变规律。该研究可为相变储热回填提供理论指导，对矿产资源和地热能的协同开发具有重要意义。
In view of high ground stress, high geothermal temperature, and thermal hazard during deep mineral resource exploitation, the concept of phase-change heat storage backfill was put forward in this study. Further, the corresponding technical system was constructed and the main content involved in technical system, which is the optimized proportion of the backfill slurry added with phase-change materials (PCMs), was examined. Moreover, we elaborated upon the collaborative optimization of a backfill body’s mechanical and thermal properties and the mutual cooperation on backfill mining, geothermal energy exploitation, and simultaneous stope cooling. The heat transfer behavior of a backfill body plays a key role in technology system. We numerically simulated the heat transfer among a backfill body, surrounding rock, and airflow in the heat storage process, as well as the heat transfer between backfill body and cold fluid during the heat release process. The temperature distribution of a backfill body at different heat storage/heat release times—i.e., the temperature distribution and its evolution—with heat transfer were revealed and analyzed. This study can provide theoretical guidance for a phase-change heat storage backfill, as it has an important significance for the collaborative exploitation of mineral resources and geothermal energy.