随着开采深度的不断增加，地热已经成为矿井深部开采的主要危害之一。高温环境不仅恶化了矿工的工作条件，而且对矿工的健康和安全造成了威胁。地热能又是一种供暖洁净能源，近年来，矿山充填—地热协同开采的工作面降温理念被提了出来，该方面的技术也得到了广泛研究。目前的成果多注重于内置水管换热器充填体的采热研究，而水管换热器换热能力有限。本文在此基础上提出了内置套管式热管换热器充填体工作面采热降温系统，并对其换热特性进行了数值模拟及实验研究。

本文建立了热管耦合相变充填体系统的传热模型，研究了不同围岩温度、换热流体温度和流量、套管式热管换热器布置数量、换热器与围岩布置间距对充填体内部温度场分布、材料相变过程、以及系统换热性能的影响。搭建了热管耦合相变充填体系统实验平台，验证了模拟结果的准确性，并提出了基本评价参数，揭示了充填体在蓄/释热状态下的传热行为、相变材料的相变特性及套管式热管换热器传热性能的时变规律。

相变材料导热系数强化分析表明，相变材料导热系数强化可显著提高潜热的提取。当围岩温度为328.15 K，释热结束时，添加5%膨胀石墨的相变材料比纯相变材料多提取43%的潜热值。

矿山热环境分析表明，围岩温度、换热流体流量的增加及换热流体入口温度的降低有利于提高相变充填体的蓄热和释热能力。围岩温度从308.15 K增大到328.15 K，总蓄热量和释热量分别增加64.36%和64.84%；换热流体流量从0.25 L/min增加至1.25 L/min，总蓄热量和总释热量分别增加46.99%和30.98%；换热流体入口温度从291.15 K减小至279.15 K，释热结束时，总释热量增加69.29%。换热流体流量的增加、换热流体入口温度的减小可提高系统总能效系数，当换热流体流量为1.25 L/min时，能效系数最大为86.03%；换热流体入口温度从291.15 K降低至279.15 K，系统总能效系数增加13.98%；围岩温度为328.15 K时，热管耦合相变充填体系统总能效系数比纯水管系统提高38.10%。

套管式热管换热器布置方式分析表明，换热器与围岩间距的减小可显著提高相变充填体的蓄热和释热能力。换热器与围岩间距从95 mm减小至20 mm，总蓄热和总释热量分别增加72.89%和91.10%。换热器数量的增加可显著提高相变充填体第一阶段的总蓄热量；换热器数量的减少有利于提升热管耦合相变充填体系统总效能。

本研究得到的采热环境和套管式热管换热器布置方式对蓄/释热过程的影响规律，为充填体的高效蓄热和采热提供了基础资料，同时也为深层地热开发奠定了基础。

With the increasing depth of mining, geothermal heat has become one of the main hazards of deep mine mining. The high temperature environment not only worsens the working conditions, but also poses a threat to the health and safety of miners. Geothermal energy is a clean energy source for heating, and in recent years, the concept of cooling the working face of mine filling-geothermal synergistic mining has been proposed, and the technology in this area has been widely researched. The current results mostly focus on the study of heat extraction in the built-in water pipe heat exchanger filling body, which has limited heat transfer capacity. In this paper, an internally arranged casing type heat pipe heat exchanger filling body working face heat extraction and cooling system is proposed on this basis, and its heat transfer characteristics are numerically simulated and experimentally studied.

In this paper, a heat transfer model of the heat pipe coupled phase change reservoir system is established to study the effects of different surrounding rock temperatures, heat transfer fluid temperatures and flow rates, as well as the number and spacing of casing type heat pipe heat exchanger arrangements on the internal temperature field distribution, material phase change processes, and system heat transfer performance of the reservoir. The experimental platform of the heat pipe coupled phase-change backfill system is built to verify the accuracy of the simulation results, and the basic evaluation parameters are proposed to reveal the heat transfer behavior of the backfill body in the heat storage/release state, the phase change characteristics of the phase change material and the time-varying law of heat transfer performance of the heat pipe - casing heat exchanger.

The enhanced analysis of the thermal conductivity of the phase change material shows that the enhanced thermal conductivity of the phase change material can significantly improve the extraction of latent heat. At the temperature of the surrounding rock of 328.15 K and the end of heat release, the phase change material with 5% expanded graphite added extracted 43% more latent heat value than the pure phase change material.

The thermal environment analysis of the mine shows that the increase of the surrounding rock temperature and the flow rate and the decrease of the inlet temperature of the heat exchange fluid are beneficial to improve the heat storage and heat release capacity of the phase change filling.The increase of the surrounding rock temperature from 308.15 K to 328.15 K increases the total heat storage and heat release by 64.36% and 64.84%, respectively. The heat exchange fluid flow rate increased from 0.25 L/min to 1.25 L/min, the total heat storage and total heat release increased by 46.99% and 30.98%, respectively; the heat exchange fluid inlet temperature decreased from 291.15 K to 279.15 K, the total heat release increased by 69.29% at the end of heat release.The increase of heat transfer fluid flow rate and the decrease of heat transfer fluid inlet temperature can improve the total energy efficiency coefficient, and the maximum energy efficiency coefficient is 86.03% when the flow rate is 1.25 L/min; the total energy efficiency coefficient of the system is increased by 13.98% when the heat transfer fluid inlet water temperature is reduced from 291.15 K to 279.15 K; the total energy efficiency coefficient of the heat pipe coupled phase change filler system is 38.10% higher than that of the pure water pipe system at the surrounding rock temperature of 328.15 K.

The analysis of heat pipe - casing heat exchanger arrangement shows that the reduction of heat exchanger to surrounding rock spacing can significantly improve the heat storage and heat release capacity of the phase change filled body. The distance between the heat exchanger and the surrounding rock was reduced from 95 mm to 20 mm, and the total heat storage and total heat release increased by 72.89% and 91.10%, respectively. The increase of the number of heat exchangers can significantly increase the total heat storage in the first phase of the phase change filler; the decrease of the number of heat exchangers is beneficial to improve the total efficiency of the heat pipe coupled phase change filler system.

The influence law of heat recovery environment and heat exchanger arrangement on heat storage/release process obtained in this study provides basic information for efficient heat storage and heat recovery in the filling body, and also lays the foundation for deep geothermal development.