中文摘要：

建立了适用于分析对冲扩散火焰中单个煤粉颗粒穿焰过程的瞬态模型,考虑了流场、温度场及组分浓度分布对单颗粒煤的运动、升温及着火特性的影响.结果表明,计算条件下煤粉颗粒最大升温速率均超过1×105,K/s.煤颗粒在穿焰过程中的着火温度随粒径增长单调递减,同时着火延迟时间先增长后趋缓.在火焰面后发生均相着火的煤颗粒其着火延迟时间随粒径变化很小,可能是因为进入高浓度氧化性气氛使得析出的挥发分迅速着火.

英文摘要：

A transient ignition model of single coal particle in one-dimensional reaction zone of counterflow flame was developed to calculate the particle temperature,density and production changes when it crosses the flame.The effects of flow,temperature and gas composition on the ignition characteristics were analyzed.Results show that the particle heating rate can reach as high as 1×105 K/s.With the increase of particle size,the ignition temperature of coal particle decreases monotonously,while the ignition delay time shows a gradual growth,probably due to the rapid ignition of volatile in an oxidizing atmosphere.