矿井热害是深井开采面临的四大职业危害之一。开采深度增加造成围岩温度升高，井下形成的高温环境严重威胁作业人员的身体健康和生命安全。探究高地温矿井综放工作面热运移规律，提出高效的制冷降温方法是解决矿井热害的有效途径。本文以山东巨野矿区热害矿井为研究对象，采用现场观测、实验研究、数值分析及试验应用相结合的方法，开展高地温综放面热源散热特性、热运移特征、温度场分布和降温方法等方面的研究，揭示风流温度、湿度和速度对热运移过程的影响作用机制，提出深井高地温综放面梯级降温方法并进行现场应用。

采用分布式光纤测温系统对7303高地温综放面风流温度进行连续监测，得到不同时间工作面温度变化规律：生产期间综放面围岩散热随开采时间呈指数增加，回风流最大温升为7.6℃；检修期间热源散热随通风时间先快速下降后趋于平缓，回风流平均温升为4.5℃；回风流温升幅度随生产时间呈周期性变化，风流温度沿综放面呈现升温速率动态波动的梯级升高规律。

基于网络热阻和热容链的热网模型分析综放面通风传热过程，揭示了风流与高温围岩热交换过程中，热量沿温度梯度由围岩向风流传递。综放面生产期间传热单元在空间维度散热量累积、时间维度周期性叠加的热量持续增加，检修期间煤壁温度在时间维度持续衰减，热源散热量动态降低。

搭建风流热运移实验系统，研究风流温度、湿度和速度变化对热表面换热过程及换热性能的影响规律。进风温度增加导致温升速率和风流焓值增量减缓，对流换热系数与进风温度呈线性负相关；湿度改变引发对流传热过程的不稳定性，加剧潜热交换对热运移的影响强度，风速增大加速了热传递过程。热表面降温过程中，进风温度与热表面降温时间呈非线性正相关，对流换热系数随通风时间呈高斯函数变化。风流湿度和速度较低时对热运移过程有正向影响，湿度和风速过高对热运移产生逆向作用，降温冷量的增加和热源放热变化，导致热量输入和输出逐渐趋于稳定，热系统中热运移达到平衡状态。

通过对综放面风流热力状态参数测定与温度场数值模拟，掌握了风流与煤壁热湿交换量的变化趋势，风流温度呈现快速下降后逐渐稳定的变化趋势，其中7303工作面的潜热传递量由1160 W降低至980 W后趋于稳定，显热传递量由3880 W下降至452 W后趋于稳定。绘制了风流温度、湿度及焓值的等值线和分布云图，风流温度场沿倾向呈温度梯度逆变的非均匀分布，靠近煤壁和采空区两侧热量高，而中间低的热量分布规律。进风温度升高导致整体温度上升，温度梯度变化幅度逐渐减小，围岩温度升高会导致综放面温度梯度增加。

针对综放面空间狭小、热量分布影响因素多、风机与空冷器不匹配等问题，设计了高地温综放面空冷器风机一体化降温装置，综放面空冷器外形（长1 m、直径0.5 m）为圆柱形，内部采用双螺旋换热管同心圆布置结构，制冷功率100 kW。风机与空冷器之间匹配最小风压为272.3 Pa，最大风量为133.7 m³/min，随支架移动降温。确定进风巷和工作面降温空冷器配置参数，提出降温装置分区布置的梯级降温方法；研发了综放面梯级降温效果和能量管控系统平台，能够对降温装置远程控制和自适应调节，实现了降温区域冷量集中管控。

通过在赵楼煤矿7303高地温综放面应用，结果表明：进风巷风流温度由30.4℃降低至19.8℃，每组降温装置对风流降温2.6℃，出口6.0 m、横向2.5 m范围为有效降温区；其中，工作面最高温度为27.5℃，回风流降温5℃。论文研究成果的应用改善了高地温综放面人员作业环境，为深井开采高温矿井综放面降温提供了新工艺和新方法。

Mine heat damage is one of the four major occupational hazards faced by deep shaft mining. The increase in mining depth causes the temperature of surrounding rock to rise, and the high temperature environment formed underground seriously threatens the health and life safety of operators. It is an effective way to solve the problem of mine heat damage by exploring the heat transport law of the comprehensive release working face in high temperature mines and proposing efficient cooling methods. Therefore, this thesis takes the heat damage mine in Shandong Juye mining area as the research object. The combined methods of field observation, experimental research, numerical analysis and experimental application are used to carry out the research on the heat dissipation characteristics of heat source, heat transport characteristics, temperature field distribution and cooling method of the high-geothermal comprehensive release face. Then, the influence mechanism of the temperature, humidity and speed of the wind flow on the process of heat transport is revealed. Finally, the stepped-cooling method of high-temperature comprehensive mining face is proposed and applied in the field.

Distributed fiber-optic temperature measurement system is used to continuously monitor the temperature of the wind flow in the 7303 comprehensive mining face, and the change rule of the temperature of the working surface at different times is obtained: during the production period, the heat dissipation of the peripheral rock in the surface is exponentially increasing with the mining time, the maximum temperature rise is 7.6℃, during the maintenance period, the heat dissipation of the heat source is rapidly decreasing and then tends to be leveled off after the ventilation time, the average temperature rise in the return air flow is 4.5℃. Besides, the temperature rise of the return airflow changes periodically with the production time, and the temperature of the airflow along the synthesized surface shows the law of gradient rise with dynamic fluctuation of the temperature rise rate.

The heat network model based on network thermal resistance and heat capacity chain analyzes the ventilation heat transfer process in the comprehensive release face, revealing that heat is transferred from the surrounding rock to the wind flow along the temperature gradient in the process of heat exchange between the wind flow and the high-temperature surrounding rock. The heat transfer unit accumulates heat dissipated in the spatial dimension and the heat superimposed periodically in the time dimension continuously increases during the production period of the comprehensive release face, and the coal wall temperature continues to decay in the time dimension during the maintenance period, and the heat dissipated by the heat source dynamically decreases.

An experimental system for heat transport in airflow is set up to study the effects of changes in airflow temperature, humidity and velocity on the heat transfer process and heat transfer performance on hot surfaces. The increase of inlet temperature leads to the slowing down of temperature rise rate and enthalpy increment of airflow, and the convective heat transfer coefficient is linearly negatively correlated with the inlet temperature. Additionally, the change of humidity triggers the instability of the convective heat transfer process, which intensifies the intensity of the influence of latent heat exchange on the heat transport, and the increase of air velocity accelerates the heat transfer process. In the hot surface cooling process, the inlet air temperature is nonlinearly and positively correlated with the hot surface cooling time, and the convective heat transfer coefficient varies with the ventilation time as a Gaussian function. Therefore, there is a positive effect on the heat transport process, when the humidity and velocity of the wind flow are low, and the humidity and wind velocity are too high to have a reverse effect on the heat transport. Meanwhile, the increase of cooling cold and the exothermic change of the heat source lead to the gradual stabilization of the heat input and output, and the heat transport in the thermal system reaches an equilibrium state.

Through the measurement and numerical simulation of the thermal state parameters of the wind flow in the comprehensive face, the change trend of the heat and humidity exchange volume between the wind flow and the coal wall is mastered. It was proved that the temperature of wind flow showed a rapid decline and then gradually stable change trend, in which the latent heat transfer volume of the working face of 7303 tends to stabilize after it decreases from 1,160 W to 980 W, and the sensible heat transfer volume tends to stabilize after it decreases from 3880 W to 452 W. Then, the contours and distribution cloud diagrams of temperature, humidity and enthalpy of the wind flow are plotted, and the temperature field of the wind flow shows a non-uniform distribution of temperature gradient inversion along the tendency, with a high heat near the coal wall and both sides of the mining area and a low heat distribution law in the middle. Furthermore, the increase of inlet air temperature leads to the increase of overall temperature, and the amplitude of temperature gradient change decreases gradually, and the increase of surrounding rock temperature will lead to the increase of temperature gradient in the synthesized face.

In view of the problems of narrow space, many influencing factors of heat distribution, and mismatch between fan and air-cooler, an integrated cooling device of air-cooler and fan is designed for high-temperature comprehensive mining face, and the shape of the air-cooler of synthesized surface (length of 1 m, diameter of 0.5 m) is cylindrical, and the internal structure of concentric arrangement of double spiral heat exchanger tubes is adopted with a refrigeration power of 100 kW. In addition, the minimum air pressure of fan and air-cooler is 272.3 Pa, and maximum air volume is 133.7 m³/min. The maximum air volume is 133.7 m³/min, and the cooling power is 100 kW with the movement of the stent. Moreover, the configuration parameters of cooling air cooler in the air inlet lane and working face are determined, also the stepped cooling method with partitioned arrangement of cooling device is proposed. The platform of stepped cooling effect and energy management and control system for comprehensive mining face is developed, which can remotely control and adaptively adjust the cooling device, and realizes centralized management and control of the cooling capacity in the cooling area.

Through the application in 7303 comprehensive mining face of Zhaolou coal mine, the results show that: the temperature of the wind flow in the inlet lane is reduced from 30.4℃ to 19.8℃, and each group of cooling device reduces the temperature of the wind flow by 2.6℃, and the range of 6.0 m in the outlet and 2.5 m in the lateral direction is the effective cooling area; among them, the highest temperature of the working face is 27.5℃, and the return air flow reduces the temperature by 5℃. The application of the thesis research results improves the working environment of the personnel in the high geothermal surface, and provides a new process and a new method for cooling down the surface of the high-temperature mining surface in deep shaft mining.

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