The ignition and combustion behavior of pulverized coal was studied with respect to coal rank in a custom-designed visual drop tube furnace. The results showed that low-rank coals were ignited in a shorter time, mainly due to the presence of larger amounts of functional groups, while the ignition delay time of high-rank coals was longer. With increasing temperature and particle size, the ignition mode of coals shifted from heterogeneous into homogeneous, which was related to the increased yield of volatile matter. The chemical percolation devolatilization analysis results showed a clear relationship between the yield and composition of volatile matter and the amount and type of functional groups in coal. In addition, the tar yield was consistent with the amount of aliphatic hydrocarbons and the length of aliphatic chains, which explained the tailing combustion mode of the bituminous coal. The findings of the study showed that the yield and composition of volatiles in coal had a significant impact on the ignition behavior, which depended on the composition of functional groups, particle size, and the combustion environment.

在定制设计的可视滴管式炉中，研究了煤粉的着火和燃烧行为与煤等级的关系。结果表明，低阶煤的点燃时间较短，这主要是由于大量官能团的存在，而高阶煤的着火延迟时间较长。随着温度和粒度的增加，煤的着火模式从非均质转变为均质，这与挥发物产率的提高有关。化学渗透挥发分析结果表明，煤中挥发物的产量和组成与官能团的数量和类型之间存在明显的关系。另外，焦油收率与脂肪烃的数量和脂肪链的长度一致，解释了烟煤的尾气燃烧模式。研究结果表明，煤中挥发物的收率和组成对着火行为有重要影响，这取决于官能团的组成，粒径和燃烧环境。