Recycling waste material for backfill coupled heat exchanger systems in underground stopes of mines
Recycling waste material for backfill coupled heat exchanger systems in underground stopes of mines
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矿山地下采场回填耦合换热器系统的废料回收
DOI：
10.1016/j.enbuild.2021.111703
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发表时间：
2021-11
影响因子：
6.7
通讯作者：
Xueli Wang
中科院分区：
文献类型：
--
作者：
Yujiao Zhao;Lang Liu;Wen De;Xiaoyan Zhang;Chao Huan;Bo Zhang;Xueli Wang
·提出了一种新型的热性能良好的回填材料。·对卧式回灌耦合换热器的可行性进行了评价。·对回填材料的力学性能和热学性能进行了测试。·通过实验探索了BCHE系统的影响因素。·NFG-BCHE的热性能显著提高。矿产资源不断向深部开采，为地热能的开发提供了适宜的条件。充填技术不仅可以保证采矿作业的安全，实现固体废弃物的回收利用，而且可以作为人工热库。然而，普通回填材料的热性能较差，限制了地热能的提取。本文提出了一种新型的热性能良好的回填材料，并进行了试验，以取代传统的材料。为实现矿产资源与地热资源的高效协同开发，采用实验方法对水平回填耦合换热器系统的可行性进行了评价。采用天然鳞片石墨与铜渣、钢渣、铝渣、煤气化渣等固体废弃物分别替代质量分数为2.5%、5%、7.5%、10%的尾矿，制备复合充填材料。对复合充填料的单轴抗压强度、微坍度、导热系数、比热容和密度进行了测试，探索出最佳配比。建立了回填耦合换热器系统的实验装置，并填充回填材料，以确定蓄热和放热过程对系统热性能的影响。研究了复合回填材料和围岩温度对回填耦合换热系统能效的影响。结果表明，随着尾矿替代率的增加，复合充填材料的单轴抗压强度、比热容和密度均较传统充填材料降低，而导热系数和热扩散系数则有所增加。最后用10%天然鳞片石墨代替尾矿制作充填体进行试验。与传统的回填料耦合换热器系统相比，当围岩温度为55 ° C时，天然鳞片石墨-回填料耦合换热器系统的放热量和总效率分别提高了579.1 kJ和31.6%。研究结果为回填耦合换热器在工程实践中的应用提供了参考。
• A novel backfill material with good thermal performance was proposed. • The possibility of horizontal backfill-coupled heat exchanger was evaluated. • The mechanical and thermal properties of the backfill materials were tested. • The influencing factors of BCHE system were explored through experiments. • The thermal performance of NFG-BCHE was significantly improved. The continuous exploitation of mineral resources into the deep strata provides suitable conditions for the development of geothermal energy. Backfill technology can not only ensure the safety of mining operation and realize the recovery and utilization of solid waste, but also serve as artificial thermal reservoir. However, ordinary backfill materials have poor thermal properties and limit the geothermal energy extraction. In this paper, a novel backfill material with good thermal performance was proposed and tested to replace the traditional materials. The feasibility of horizontal backfill coupled heat exchanger system was evaluated by experimental method for the purpose of efficient cooperative development of mineral resources and geothermal resources. Natural flake graphite and other solid waste materials, such as copper slag, steel slag, aluminum slag and coal gasification slag were used to replace tailings of 2.5%, 5%, 7.5% and 10% by mass fraction to make the composite backfill material. The uniaxial compressive strength, mini-slump, thermal conductivity, specific heat capacity and density of the composite backfill material were tested to explore the best proportion. An experimental set-up of a backfill-coupled heat exchanger system was then constructed and filled with the backfill material to determine the heat storage and release processes on the thermal performance of the system. The influence of the composite backfill material and surrounding rock temperatures on the energy efficiency of the backfill coupled heat exchanger system was evaluated. The results showed that, with the increase of the tailings substitution rate, the uniaxial compressive strength, specific heat capacity and density of the composite backfill material were reduced compared with the traditional backfill material, while the thermal conductivity and thermal diffusion coefficient were increased. Finally, 10% natural flake graphite instead of tailings was used to make the backfill body for testing. Compared with traditional backfill coupled heat exchanger system, when the surrounding rock temperature was 55 °C, the heat discharging and the total efficiency of natural flake graphite - backfill coupled heat exchanger system increased by 579.1 kJ and 31.6 %, respectively. The research results provide a reference for the application of backfill coupled heat exchangers in engineering practice.
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相变蓄热充填地热能开发理念、技术体系及传热分析
影响因子：
3.2
作者：
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DOI：
10.1016/j.compositesb.2018.11.053
发表时间：
2019-05
期刊：
Composites Part B: Engineering
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影响因子：
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