【摘要】 本文发展并建立了一套适用于研究煤粉穿越气相火焰面着火特性的对冲火焰实验系统,基于碰撞解聚原理研制了全新的微小载气量给粉系统。通过统计ICCD拍摄的煤粉着火图像,结合数值计算分析煤粉颗粒的沿程温度经历,发现穿越扩散火焰面时颗粒升温速率可达10~5 K/s,火焰面温度及煤粉停留时间是决定煤粉穿越火焰面后着火模式的主要因素。更多还原

【Abstract】 A novel counterflow flame apparatus that can meet the requirement of heterogeneous combustion of pulverized coal particles was developed.A new micro-scale powder feeding system was developed based on the fundamental of deagglomeration by particle-wall impaction,achieving a perfect dispersion and stable feeding rate of coal particles in low carrier flows.With the advanced ICCD optical technology,the behavior of coal particles across the counterflow flame was observed.Results show that the particle heat rate can reach as high as 10~5 K/s,while flame temperature and particle residence time are the dominant factors that influence the ignition mechanism in the post-flame zone.更多还原