将煤粉空气两相流在着火前和着火期间基本上仍遵从的射流发展规律作为模型基础，考虑了煤粉颗粒与气相间的速度滑移与温度滑移。气相场按射流规律发展井计及颗粒群对气相温度、速度、浓度变化的影响；颗粒群则按Ｌａｇｒａｎｇｅ处理方法追踪颗粒变化史。模型首次采用了挥发分与环境氧气匹配达着火限方能产生挥发分火焰的概念并取得了与实验现象一致的计算结果。 Based on the law of jet development that the two-phase flow of pulverized coal air still basically follows before and during fire, the velocity slip and temperature slip between pulverized coal particles and gas phase are considered. According to the law of jet flow in the gas phase field, the effects of particle swarm on the temperature, velocity and concentration of gas phase were calculated. Particle swarm was followed by Lagrange method to track the particle change history. For the first time, the model adopted the concept that volatile matter matches the oxygen in the environment and reaches the limit of fire to generate the volatile flame, and the calculation results consistent with the experimental results have been obtained.