中文摘要：

建立了球坐标系下传热、传质、化学反应全耦合的煤粉燃烧数值模拟程序．通过煤粉与事先脱除挥发分的焦炭的对比实验及数值模拟，研究了挥发分火焰对碳粒表面一次产物CO火焰的点燃及碳粒燃烧的影响．傅里叶变换红外光谱仪（FTIR）测温实验及煤粉燃烧动态过程的数值模拟结果不仅进一步验证了碳粒着火初期CO火焰所引起的颗粒高温现象，而且给出了挥发分引燃表面反应一次产物CO的直接证据．由于挥发分火焰的引燃作用，碳粒可以在较其非均相着火温度为低的温度下被点燃，阐明了Jüntgen提出的联合着火方式的物理本质．

英文摘要：

The programs for simulating pulverized-coal particle combustion, which take chemical reactions, and heat and mass transfer into account, were established in spherical coordinate system. Through contrastive experiment and numerical simulation between pulverized coal and devolatilized char, the influences of volatile flame on the CO gas reaction and char particle combustion were studied. The FTIR temperature-measuring experiment and numerical simulation on the dynamic process of pulverized coal combustion prove not only that the phenomenon of elevated particle temperature induced by CO flame in the initial period of ignition exists, but also that volatile flame induces the combustion of the primary product of surface reaction, CO. Due to the function of volatile flame, char particle may be ignited at temperature lower than its heterogeneous ignition temperature. It shows the physical essence of joint hetero-homogeneous ignition mode suggested by Jüntgen.