In many actual industrial scenes, the coal body and coal dust are not always in the tiled state, but in the inclined situation. A two – dimensional transient numerical model of coal oxidation reaction was established to study the self–ignition and smoldering characteristics of coal dust layers in the presence of inclination angle. The effects of gravity and thermal buoyancy were considered to solve the coupling problem of coal oxidation reaction and air flow. The results show that the growth coefficients of minimum ignition temperature of coal dust with thicknesses of 6.4 mm, 12.7 mm, 19.1 mm and 25.4 mm are 0.117 °C/°, 0.0467 °C/°, 0.033 °C/° and 0.033 °C/°, respectively. With the increase of hot plate temperature, the inclination of coal dust can greatly shorten the ignition delay time (IDT). The ΔIDT of coal dust inclination of 60° is 128 s/°C greater than that of 0°. The movement of high temperature point of coal dust in self–heating development stage is from the inside to the outside, and that in decaying stage is from the outside to the inside. In addition, some interesting phenomena in the process of coal self–ignition and smoldering have also been found. The influence of coal dust inclination on its self–heating is mainly reflected in the location of high temperature points and the spread of smoldering. This study is helpful to understand the characteristics of coal dust self–ignition and smoldering spread in inclined situation, and can guide the prevention of coal dust self–ignition.

在许多实际工业场景中，煤体和煤尘并不总是处于平铺状态，而是处于倾斜状态。建立了煤氧化反应的二维瞬态数值模型，研究了存在倾角时煤尘层的自燃和阴燃特性。考虑重力和热浮力的影响，解决了煤氧化反应与空气流动的耦合问题。结果表明，厚度为6.4 mm、12.7 mm、19.1 mm和25.4 mm的煤尘最低着火温度增长系数分别为0.117 °C/°、0.0467 °C/°、0.033 °C/°和0.033 °C /°，分别。随着热板温度的升高，煤尘的倾斜可以大大缩短点火延迟时间（IDT）。煤尘倾角60°的ΔIDT比0°的大128 s/°C。自热发展阶段煤尘高温点由内向外移动，衰减阶段由外向内移动。此外，还发现了煤自燃和阴燃过程中的一些有趣现象。煤尘倾角对其自热的影响主要体现在高温点的位置和阴燃的蔓延。本研究有助于了解倾斜情况下煤尘自燃和阴燃蔓延的特点，对预防煤尘自燃具有指导意义。而在衰败阶段是由外到内。此外，还发现了煤自燃和阴燃过程中的一些有趣现象。煤尘倾角对其自热的影响主要体现在高温点的位置和阴燃的蔓延。本研究有助于了解倾斜情况下煤尘自燃和阴燃蔓延的特点，对预防煤尘自燃具有指导意义。而在衰败阶段是由外到内。此外，还发现了煤自燃和阴燃过程中的一些有趣现象。煤尘倾角对其自热的影响主要体现在高温点的位置和阴燃的蔓延。本研究有助于了解倾斜情况下煤尘自燃和阴燃蔓延的特点，对预防煤尘自燃具有指导意义。