煤粉颗粒燃烧过程可视化研究

基于McKenna型燃烧器，研制了双光路成像系统，对煤粉颗粒燃烧过程中的背光投影轮廓图像和自发光光强分布信息进行同步采集，观察了不同高度位置煤粒的运动、着火和燃烧过程。针对烟煤和无烟煤颗粒燃烧实验中出现的挥发组分着火燃烧、碳黑形成、焦炭着火燃烧等现象进行了分析，发现两种煤种分别以均相着火和非均相着火为主。同时对煤颗粒燃...

Ignition process visualization of pulverized coal particles

Based on the McKenna burner, a dual light path imaging system was developed to synchronously collect the backlight projection profile image and the self-luminous light intensity distribution during the combustion of pulverized coal particles. Experiments were conducted on bituminous coal and anthracite particles separately, volatile ignition, soot formation, coke ignition were observed simultaneously, and corresponding analysis was conducted. It was found that the two coal types were mainly in homogeneous and heterogeneous ignition pattern, respectively. The separation phenomenon of solids and volatiles due to the interphase velocity difference between phases was observed during the burning of coal particles, and an image processing program was applied to calculate the corresponding motion speed. The study provides a reference for further quantitative analysis of the ignition and combustion characteristics of pulverized coal particles.