由于煤炭开采范围的扩大及开采工艺的转变，采空区成为煤自燃灾害的主要易发地。实际采空区的发火现场极具复杂性与动态危险性，其自燃高温点不易监测，难以判定，致使有效防控煤自燃难度加剧。因此，本文通过煤自然发火实验研究高温点的迁移规律；基于传热学理论，采用 COMSOL Multiphysics 软件模拟自然发火实验，并与实验结果进行对比分析；继而，根据采空区多场耦合理论控制方程及煤自燃过程中各物理场在工作面动态推进下的变化，考虑工作面在不同的供风量、推进速度等影响因素下，展开了采空区煤自燃氧化升温数值模拟研究，分析了采空区自燃过程中氧浓度场、温度场及流场的演化机制，研究成果对现场的采空区自燃防治工作具有重要的指导意义。

       利用煤自然发火实验系统，对大佛寺煤样的自然发火全过程进行实验测试，跟踪测定整个发火过程中温度及指标气体的变化规律，实验结果表明，炉内的高温点一直处于中心轴附近，且不断地向进风口迁移；继而根据传热学的理论，利用 COMSOL Multiphysics 软件建立煤自然发火实验系统温度场数值模型，分析不同氧体积分数与漏风强度条件下，煤自然发火高温点的迁移规律，最后通过对比模拟与实验中高温点的迁移规律，为采空区高温点的迁移规律奠定了较好的理论基础。

       基于采空区多场耦合理论控制方程及其自燃的动态演化过程，采用变形几何的方法，建立煤自燃采空区动态演化模型，模拟了大佛寺 40106 工作面在不同工况条件下（不同推进速度及不同供风量）氧浓度、温度场的分布。随着工作面推进速度的增加，采空区氧浓度场分布规律趋于稳定，而采空区的高温点随推进速度的增加逐渐降低，高温区域也存在一定的拖尾现象。此外，在一定的定量条件下，采空区的温度变化与供风量成正相关，当供风量越大时，采空区的高温点越大，就越往采空区的深部窒息带延伸。最后深入分析采空区高温区域与氧化带宽度的动态叠加效应，并与现场实测数据进行对比验证，研究结果对采空区煤自燃防治工作具有重要指导意义。

Due to the expansion of coal mining scope and the transformation of mining technology,goafs have become the main prone areas for coal spontaneous combustion disasters. The actual fire site in the goaf is extremely complex and dynamic, and its spontaneous combustion high temperature points are difficult to monitor and difficult to determine, which makes it more difficult to effectively prevent and control coal spontaneous combustion. Therefore, this thesis uses the coal spontaneous combustion experiment to study the migration law of high temperature points; based on the theory of heat transfer, the COMSOL Multiphysics software is used to simulate the spontaneous combustion experiment, and the experimental results are compared and analyzed; Finally, according to the control equations of multi-field coupling theory in the goaf and the changes of various physical fields with the dynamic advancement of the working face during the process of coal spontaneous combustion, considering the influence factors of the working face such as different air supply and advancing speed, the coal in the goaf is developed. Numerical simulation study of spontaneous combustion and oxidation heating, analyzed the evolution mechanism of oxygen concentration field, temperature field and flow field during the spontaneous combustion of the goaf. The research results have important guiding significance for the prevention and control of spontaneous combustion in the goaf.

Using the coal spontaneous combustion experiment system, the whole process of the spontaneous combustion of the Dafosi coal sample was tested, and the temperature and index gas changes during the entire combustion process were tracked and measured. The experimental results showed that the high-temperature point in the furnace was always near the central axis. And continue to migrate to the air inlet; then based on the theory of heat transfer, use COMSOL Multiphysics software to establish a numerical model of the temperature field of the coal spontaneous combustion experiment system, and analyze the migration law of the high temperature point of the coal spontaneous combustion under the conditions of different oxygen volume fraction and air leakage intensity. Finally, by comparing the migration law of high temperature points in the simulation and experiment, a good theoretical foundation is laid for the migration law of high-temperature points in the goaf.

Based on the control equation of multi-field coupling theory of goaf and the dynamic evolution process of spontaneous combustion, the dynamic evolution model of goaf with coal spontaneous combustion was established by using the method of deformation geometry, and the distribution of oxygen concentration and temperature field in Dafosi 40106 working faceunder different working conditions (different propulsion speed and different air supply) was simulated. With the increase of the advancing speed of the working face, the distribution law of the oxygen concentration field in the goaf tends to be stable, and the high-temperature point in the goaf gradually decreases with the increase of the advancing speed, and there is also a certain tailing phenomenon in the high-temperature area. In addition, under certain quantitative conditions, the temperature change in the goaf is positively correlated with the air supply volume. When the air supply is larger, the high-temperature point in the goaf area is larger, and the more it extends to the deep suffocation zone of the goaf area. Finally, the dynamic superposition effect of the high-temperature area and the width of the oxidation zone in the goaf is deeply analyzed, and compared with the field measured data, the research results have important guiding significance for the prevention and control of coal spontaneous combustion in the goaf.

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