摘要
利用Hencken型平面携带流反应器系统,研究了不同流动状态下一次风含氧量对煤粉颗粒群着火特性的影响。实验表明,在湍流状态下的一次风火焰形态与层流状态下存在很大差别。随O_2浓度增大,煤粉颗粒群着火延迟减小,在层流状态下表现得更明显。在湍流一次风中煤粉颗粒群倾向于非均相着火,呈现出连续的暗红色火焰;而在层流一次风中,煤粉颗粒群倾向于均相着火,并会因局部氧量的不足在某一高度突然出现明亮的黄色碳烟火焰。
Effects of primary flow particles were investigated on an oxygen concentration on the ignition lift off distance of the coal optical entrained-flow reactor system based a Hencken burner The results show the ignition lift off distance decreases as the primary flow oxygen concentration increases and the trend is more apparent for laminar primary flow. The primary flow velocity has a strong effect on the characteristics of the coal flames. For turbulent primary flow with a high velocity, coal particles diffuse into hot surroundings forming a dark-red flame attached to the iniector Pipe. while for laminar primary injection flow case, bright yellow coal flames were observed.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2013年第10期1964-1968,共5页
Journal of Engineering Thermophysics
基金
自然基金资助项目(No.51006062
No.51076081)
