深部矿井开采面临着日益严重的热害问题，换种角度，矿井高温热害的问题可以转化成高效提取地热资源的问题，地热能被认为是用于产生热量的最有前途和最清洁的能源之一。针对矿井热害问题，本文提出在充填体内布置套管换热器进行采热的新方法，换热器的环形空间填充相变材料，采热埋管中通入换热流体。充填体通过吸收围岩与采场风流的热量并储存于自身，通过与换热流体的换热过程提取地热能，从而在缓解高温深井高地应力及热害问题的基础上，实现对地热能的有效开发利用。

 本文以内置套管换热器的充填体为研究对象，建立内置套管换热器的充填体相变释热三维非稳态数值模型，通过模拟研究了采热条件、材料特性及管排方式等对充填体释热性能的影响；搭建了充填体耦合套管换热器传热的实验平台，对模拟结果的准确性和真实性进行了验证；此外，采用了基本评价参数、无量纲评价准则及综合评价因子三种评价方法，对系统的传热和流动性能做出综合评价。

首先研究了不同充填体初始温度、换热流体温度及速度等采热条件对充填体释热过程的影响，并采用基本评价参数对充填体内部温度场分布，相变材料的相变特性及换热器的传热性能进行了量化分析。结果表明：当充填体初始温度55°C、换热流体入口温度12°C、入口流速由0.14m/s时，充填体的释热量最多，为66.39×10⁶kJ。其次，研究了在不同配比下充填料浆的灰砂比、料浆浓度和不同回填材料等材料性能的影响。随着充填料浆灰砂比或者料浆浓度的增大，传热流体的出口温度和传热速率，相变材料的液相分数和完全凝固时间都增大。当灰砂比1:4，料浆浓度72%时，充填体的释热量最多，为45.96×10⁶kJ。灰砂比或者料浆浓度越大，充填体的导热系数越大，热量传递得越快，充填体的比热容和密度也越大，积蓄的热量越多，传递给相变材料的热量就越多，环形空间内部的温度越高，相变材料凝固得就越少。此外，相变材料回填的热量明显远大于普通充填体，相变回填的热量增加幅度在4.8%-12.73%，其中，增强酸回填时的热量最多，为47.81×10⁶kJ。最后，研究了采热埋管的管径和管间距等管排方式对充填体内置采热埋管热压性能的影响，并采用无量纲评价参数和综合评价因子对系统性能进行了评价。采用管径32mm，管间距2.5m能获得最高的综合评价因子，为0.969。适当的加大管道间距可以降低管道之间的热干扰作用，更短的流动路径使得系统的摩擦阻力较小，从而提高系统的综合性能。

本文的研究结果为实现矿床-地热协同开采提供理论参考，为充填体内回填材料的选择和换热器的设计与运行提供理论数据。

Deep mine mining is facing the increasingly serious heat damage problem. In another perspective, the problem of high temperature heat damage in mines can be transformed into the problem of efficient extraction of geothermal resources. Geothermal energy is considered to be one of the most promising and cleanest energy sources for heat generation. Aiming at the problem of mine heat damage, this paper puts forward a new method of heat extraction by arranging casing heat exchanger in the backfill body. The annular space of the heat exchanger is filled with phase change material, and the heat transfer fluid is passed into the buried heat pipe. The backfill body absorbs the heat from the surrounding rock and the airflow of the stope and stores it in itself, and extracts the geothermal energy through the heat exchange process with the heat exchange fluid. Thus, on the basis of alleviating the problems of high ground stress and heat damage in high temperature deep well, the effective exploitation and utilization of geothermal energy can be realized.

This paper takes the backfill body with casing heat exchanger as the research object, and a three-dimensional unsteady numerical model for phase change heat release of backfill body with inner tube heat exchanger was established, the effects of heat conditions, material characteristics and pipe arrangement on the heat release performance of backfill body were studied by simulation; an experimental platform for heat transfer of backfill body coupled casing heat exchanger was built, the accuracy and authenticity of the simulation results were verified, and the performance factors of backfill body heat exchanger were analyzed and discussed. In addition, three evaluation methods, including basic evaluation parameters, dimensionless evaluation criteria and comprehensive evaluation factor, are adopted to comprehensively evaluate the heat transfer and flow performance of the system.

Firstly, the influence of different initial temperature of backfill body, temperature and velocity of heat transfer fluid on the heat release process of backfill body was studied, and the temperature field distribution inside the backfill body, the phase change characteristics of the phase change material and the heat transfer performance of the heat exchanger were quantitatively analyzed by the basic evaluation parameters. The results show that when the initial temperature of the backfill body is 55°C, the inlet temperature of the heat transfer fluid is 12°C and the inlet velocity is 0.14m/s, the heat transfer capacity of backfill body is the largest, 66.39×10⁶kJ. Secondly, the effects of cement-tailing ratio, slurry concentration and different backfill materials on the properties of the filling slurry were studied. With the increase of cement-tailing ratio or slurry concentration, the outlet temperature and heat transfer rate of the heat transfer fluid, the liquid fraction and the complete solidification time of the phase change material all increase. When the cement-tailing ratio is 1:4, the slurry concentration is 70%, the heat transfer capacity of backfill body is the largest, 45.96×10⁶kJ. The higher the cement-tailing ratio or slurry concentration, the higher the thermal conductivity of the backfill body, the faster the heat transfer rate and the higher the specific heat capacity and density of the backfill body, the more heat accumulated, the more heat transferred to the phase change material, the higher the temperature inside the annular space, the less the phase change material solidifies. In addition, the heat transfer capacity of backfill body with phase change material is significantly greater than that of ordinary backfill body. At the end of heat release, the increase range of the heat transfer capacity of backfill body with phase change material is 4.8%-12.73%. Among them, the heat transfer capacity of backfill body with enhanced acid is the largest, which is 47.81×10⁶kJ. Finally, the influence of the pipe arrangement mode such as pipe diameter and pipe spacing on the thermal-pressure performance of the pipe group in the backfill body was studied. The system performance is evaluated with dimensionless evaluation parameters and comprehensive evaluation factors. When the pipe diameter is 32mm, the pipe spacing is 2.5m, the highest comprehensive evaluation factors is obtained, which is 0.969. It can be seen that appropriately increasing the pipe spacing reduce the thermal interference between pipes, and the shorter flow path can reduce the friction resistance of the system, so as to improve the comprehensive performance of the system.

The research results of this paper provide theoretical reference for the realization of ore deposit and geothermal coordinated mining, and provide theoretical data for the selection of backfill materials in the backfill body and the design and operation of heat exchangers in the backfill body.

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