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为提高煤堆压实防治自燃可行性的预判能力,基于煤堆自燃理论,使用COMSOL Multiphysics 5.0数值仿真软件,建立煤堆自燃模型,对5个不同堆放规格尺寸煤堆进行压实后温度变化和自然发火期变化进行了分析,从以上两个角度研究了煤堆最低不适用压实风速,建立了与煤堆孔隙率相关的最低不适用压实的风速方程。结果表明,煤堆压实防治自燃存在不同的最低不适用风速,从温度变化角度考虑的最低不适用压实风速小于从自然发火期角度考虑时的最低风速,从安全角度考虑取二者较小值作为判断标准,煤堆压实最低不适用风速与煤堆堆放参数相关性不强,受原孔隙率影响较为显著,最低不适用压实风速与孔隙率之间具有幂函数关系。
In order to improve the predictability of the feasibility of coal sponge compaction prevention and control spontaneous combustion, based on the theory of coal spontaneous combustion, using COMSOL Multiphysics 5.0 numerical simulation software to establish the coal spontaneous combustion model, the temperature changes of 5 different stack size coal compaction And spontaneous combustion period were analyzed. From the above two angles, the lowest applicable compaction wind speed of coal mines was studied, and the lowest uncompressed wind speed equation related to porosity of coal bed was established. The results show that there are different lowest applicable wind speeds for coal sponge compaction prevention and control, and the minimum uncompressed wind speed considered from the perspective of temperature change is less than the lowest wind speed considered from the perspective of natural fire ignition. As the criterion, the correlation between the wind speed and the pile stacking parameters is not strong, the influence of the original porosity is significant, and the minimum is not applicable. There is a power function relationship between the compaction wind speed and the porosity.