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煤田火灾持续燃烧的重要原因是存在沟通地表与地下的供氧裂隙,新疆煤田火区地表黄土覆盖稀薄、含砂量大形成了透气率较高的地层条件,加之四季温差大对地下煤田火系统具有一定的影响。建立了露头煤层自燃的数值模型,以新疆硫磺沟火区的四季温度为参数,分析了地下火区受四季温度影响下的内部压力场、温度场的演化过程。数值实验结果表明:地下火区的温度场分布范围随大气温度的降低而缩小,但影响范围随深度增加而减小;地下渗流气体的流速受外部压力和内部气体热膨胀效应的差值影响,一般随外部温度的下降而增大、升高而减小。
The continuous burning of coalfield fires is mainly due to the presence of surface and subsurface supply of oxygen fissures, Xinjiang coalfield surface area of loess is thinly covered, the amount of sand formed a high permeability of the formation conditions, combined with the temperature difference between the four seasons of underground coal fire system Has a certain impact. A numerical model of coal spontaneous combustion in outcropped coal seam is established. Based on the four seasons temperature of sulfur fire area in Xinjiang, the evolution process of internal pressure field and temperature field of underground fire area under the influence of four seasons temperature is analyzed. Numerical results show that the distribution of temperature field in underground fire area decreases with the decrease of atmospheric temperature, but the influence range decreases with the increase of depth. The flow rate of subsurface gas is affected by the difference between external pressure and internal gas thermal expansion. As the external temperature decreases and increases, decreases.