Ignition of coal dust caused by hot particles (ICDHP) will lead to serious combustion or explosion. In this work, the coupling details of multi–physical fields of the ICDHP were established. Two different chemical reactions of flaming combustion of volatiles and smoldering of coal dust were established to understand the mechanism and process of the ICDHP. The evolution of temperature, volatiles molar concentration and heat release characteristics under different particle temperatures and contact conditions between the hot particle and coal dust were investigated. Results show that there are two ways of the ICDHP, which are volatiles ignition and coal smoldering ignition. The ignition delay time (IDT) increases exponentially with the decrease of the hot particle temperature. The temperature of the hot particle is 1100 K, and thermal runaway occurs in the way of coal smoldering ignition. When the temperature of the hot particle is higher than 1100 K, thermal runaway occurs in the way of volatiles ignition. In addition, it is found that the IDT decreases exponentially with the increase of the buried depth (l_p) of the hot particle in coal dust for the hot particle temperature of 1186 K. The IDT shows a trend of decreasing – increasing – decreasing with the increase of l_p for the hot particle temperatures of 1271 K and 1369 K. If the hot particle is completely embedded in the coal dust, the smoldering combustion of the coal dust is found. In addition, the volatiles first react on the side of the hot particle, and the thermal runaway occurs at the position where the concentration and temperature of volatiles are high enough.

由热颗粒（ICDHP）引起的煤尘点燃会导致严重燃烧或爆炸。在这项工作中，建立了 ICDHP 多物理场的耦合细节。建立了挥发物有焰燃烧和煤尘阴燃两种不同的化学反应，以了解 ICDHP 的机理和过程。研究了不同颗粒温度和热颗粒与煤尘接触条件下温度、挥发物摩尔浓度和放热特性的演变。结果表明，ICDHP有两种方式，即挥发物点火和煤阴燃点火。点火延迟时间（IDT）随着热粒子温度的降低呈指数增加。热粒子的温度为 1100 K，煤的阴燃点火方式发生热失控。当热粒子的温度高于 1100 K 时，以挥发物点火的方式发生热失控。此外，发现IDT随着埋深的增加呈指数下降（l _p ) 的热粒子温度为 1186 K。当热粒子温度为 1271 K 和 1369 K 时，IDT 显示出随着l _p的增加而减小-增加-减小的趋势。如果热颗粒完全嵌入煤尘中，发现煤尘阴燃。此外，挥发物首先在热粒子一侧发生反应，在挥发物浓度和温度足够高的位置发生热失控。