中文摘要：

为了对煤焦颗粒的燃烧过程进行更精确的预测,该文从多组分混合反应系统守恒方程出发,构建了一套能够精确模拟煤焦颗粒燃烧过程的数值方法。该方法细致描述了煤焦颗粒边界层内发生的一系列物理化学过程,有助于煤焦燃烧机理的研究,计算量也不大。该方法还可以用于对流动形态较为简单的实际工况的模拟,如煤焦颗粒在沉降炉内燃烧等。通过实验测得4种煤焦在沉降炉中燃烧的最终转化率,并运用该方法对其进行预测,证明了该方法的可靠性。模拟结果表明：随着环境温度的升高,煤焦燃烧速率加快,颗粒边界层中O2摩尔分数下降更多,而产物CO和CO2的摩尔分数却明显上升。

英文摘要：

A numerical method is developed based on the conservation equations for multicomponent reacting systems to better predict char particle combustion.The advantage of this method is that many physical and chemical processes occurring in the char particle boundary layer are described in detail with less CPU time,which improves the studies of the char combustion mechanism. This method can also be used to simulate real situations with relatively simple flow patterns,like the char particle combustion in a drop tube furnace（DTF）.Four chars are combusted in a DTF with their final conversions measured.The predicted char conversions compare well with the measured data to validate this method.As the ambient temperature increases,the char combustion rate becomes faster and the O2 concentration decreases while the CO and CO2 amounts strongly increase in the char particle boundary layer.