矿产资源是人们生存与社会发展的重要物质基础，经过多年的不断开采，浅部资源逐年减少，深部开采已成为我国矿产资源不可避免的发展趋势。随着矿井开采深度的不断增加，随之遇到了一系列的问题，高温环境是其中的难题之一。为了使开采工作顺利进行，必须采取有效措施降低开采环境的温度，矿井的高温环境主要是由于高温围岩造成的，地热对于矿井开采环境产生了负面影响，而对于其他用热领域则是有利的。基于以上考虑，将深部矿井降温与地热开发相结合，从而实现更经济有效的矿井降温。
本文基于充填采矿法、辐射供冷与传热学原理，在充填体内部布置冷水管道，应用Ansys模拟软件建立充填体冷壁降低工作面温度的三维换热模型，以充填体冷壁面和工作面风流为研究对象，利用Fluent软件模拟不同工况对冷壁温度的影响以及不同热环境对工作面降温效果的影响，分析了管间距、冷流体进口温度与进口速度、充填体导热系数等因素对冷壁温度分布和冷壁释冷量的影响，以及工作面辐射供冷模式下送风温度、送风速度、围岩温度、冷壁温度等参数对工作面风流温度沿程变化的影响，并将本文的充填体冷壁降温与传统的空冷器降温方式进行对比。
对不同工况下充填体冷壁的研究表明：在管道中流动的冷流体可以有效降低充填体温度而形成冷壁，冷壁释冷量在初期显著增加，后期缓慢增加并逐渐趋于稳定。释冷量随管间距的增大稳定下降，当管间距从0.5m增大到1.5m时，释冷量从11.72 kW减小到4.16 kW，管间距越小，相邻管间的传热相互影响越明显。冷流体入口温度越低，释冷量越大，冷流体入口温度每降低4℃，释冷量增加2.06 kW。冷流体的入口速度对释冷量的影响不明显。随着充填体导热系数的增加，释冷量明显增加，当导热系数以增量0.5 W/(m•℃)从0.5 W/(m•℃)增加到2.0 W/(m•℃)，在20-60天内，释冷量平均增加3.22kW、2.17kW和1.52kW。
对不同热环境下工作面风流的研究表明：充填体冷壁降温措施的采用，使得测点温度明显降低，距离入风口越远，降温效果越为明显；在工况3中工作面各截面沿程风流温度增量分别降低了0.94℃，0.71℃，0.63℃，0.59℃，0.55℃，0.52℃；送风温度、围岩温度与冷壁温度对风流温度的影响为正相关，送风速度为负相关，送风温度降低2℃风流温度降低1.52℃，送风速度增加0.5m/s风流温度降低范围在0.40℃以内，围岩温度在35-55℃之间时风流温度均低于28℃，冷壁温度降低1℃风流温度降低0.12℃。
综合分析结果显示对冷壁温度和释冷量影响程度最大的是管间距，对工作面风流温度影响最大的是入口温度与围岩温度。不同降温条件的对比表明，在没有冷却措施的情况下，风流温度沿程升高明显，在充填体内置管道中通入冷流体时，充填体壁面温度明显降低并迅速形成冷壁。冷壁的冷量迅速释放到风流中，利用辐射供冷原理有效地实现了风流的冷却。充填体冷壁与空冷器降温方式的对比结果显示两种方式均能很好的达到降温效果，其中冷壁降温不仅能有效解决矿井高温问题，同时也为地热能提取创造了有利条件。本研究不仅为深部矿井工作面降温与地热能协同开采提供了很好的解决思路，同时研究结果为深部矿井热害防治中的充填体辐射供冷技术的应用及冷却效果分析提供理论依据和基础数据。

Mineral resources are the important material basis for people's survival and social development. After years of continuous mining, shallow resources have been reduced year by year, and deep mining has become an inevitable development trend of mineral resources in China. With the continuous increase of mining depth, a series of problems are encountered, among which high temperature environment is one of the difficult problems. In order to make the mining work go on smoothly, it is necessary to take effective measures to reduce the temperature of the mining environment. The high temperature environment of the mine is mainly caused by the high temperature surrounding rock, and geothermal has a negative impact on the mining environment, but it is beneficial to other areas using heat. Based on the above considerations, the deep mine cooling is combined with geothermal development, so as to achieve more economic and effective mine cooling.
Based on the backfill mining method, radiant cooling and heat transfer principle, the cold-water pipes are arranged inside the backfill body, and the three-dimensional heat transfer model of the backfill body cold wall to reduce the airflow temperature of working face is established by using Ansys simulation software. This paper takes the cold wall of backfill body and the airflow of working face as the research objects. Fluent software is used to simulate the influence of different working conditions on the cold wall temperature and the influence of different thermal environments on the cooling effect of working face. The influences of pipe spacing, the inlet temperature and inlet velocity of cold fluid, and the thermal conductivity of backfill body on the temperature distribution and cooling capacity of cold wall are analyzed. And the influence of the inlet temperature and inlet velocity of airflow, the surrounding rock temperature，the cold wall temperature and other parameters on the temperature distribution of airflow along the working face under the radiation cooling mode also are analyzed. Then, the cold wall cooling method of backfill body in this paper is compared with the traditional air cooler cooling method. 
The results on the backfill body cold wall under different working conditions show that the cold fluid in embedded pipe can effectively reduce the temperature of backfill body and form the cold wall, the cooling capacity of cold wall increases significantly in the initial period, and then increases slowly and gradually tends to stable in the later period. The cooling capacity decreases steadily with the increase of pipe spacing, when the pipe spacing increases from 0.5m to 1.5m, the cooling capacity deceases from 11.72 kW to 4.16 kW, while the smaller the pipe spacing, the more obvious the heat transfer interaction between adjacent pipes. The lower the inlet temperature of cold fluid, the greater the cooling capacity, the cooling capacity increases by 2.06 kW when the inlet temperature of cold fluid decreases by 4℃. The inlet velocity of cold fluid has a little obvious effect on the cooling capacity, the cooling capacity obviously increases with the increase of the thermal conductivity of backfill body, when the thermal conductivity increases from 0.5 W/(m•℃) to 2.0 W/(m•℃) in increments of 0.5W/(m•℃), the increment of cooling capacity is about 3.22 kW, 2.17 kW and 1.52 kW respectively on average in 20-60 days. 
The results on airflow of working face under different thermal environment show that the temperature of measuring point is significantly reduced with the adoption of cooling measures of backfill body cold wall, and the farther away from the airflow inlet, the more obvious the cooling effect. The increment of airflow temperature in several sections along the working face decreases by 0.94℃, 0.71℃, 0.63℃, 0.59℃, 0.55℃, 0.52℃ respectively in working condition 3. The airflow temperature of working face is positively correlated with the airflow inlet temperature, surrounding rock temperature and cold wall temperature, and negatively correlated with the airflow inlet velocity. The airflow temperature decreases by 1.52℃ when the airflow inlet temperature decreases by 2℃, the airflow temperature decreases within 0.40℃ when the airflow velocity increases by 0.5m/s, the airflow temperature is lower than 28℃ when surrounding rock temperature is between 35-55℃, the airflow temperature decreases by 0.12℃ when the cold wall temperature decreases by 1℃.
The comprehensive analysis results show that the pipe spacing has the greatest influence on the temperature of the cold wall and cooling capacity, and the inlet temperature of airflow and surrounding rock temperature have the greatest influence on the airflow temperature of working face. Comparison of different cooling conditions shows that the airflow temperature increases significantly along the working face in the absence of cooling measures, and when cold fluid is passed through the pipe in backfill body, the temperature of the backfill body wall decreases significantly and the cold wall forms rapidly. The cold will be released rapidly from the cold wall to the airflow, effectively realizing the cooling of airflow by radiant cooling principle. Through the comparison of backfill body cold wall and air cooler cooling method, the results show that both methods can achieve good cooling effect, which cold wall cooling can not only effectively solve the mine high temperature problem, but also create favorable conditions for geothermal energy extraction. The research results not only provide a good solution for collaborative mining of deep mine working face cooling and geothermal energy, but also provides theoretical basis and basic data for the application of radiation cooling technology of backfill body and analysis of cooling effect in deep mine thermal hazard prevention.

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