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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。
The influence of primary air oxygen content on the ignition characteristics of pulverized coal particles under different flow conditions was studied by using Hencken-type flat-surface-carrying flow reactor system. Experiments show that there is a big difference between the primary flame shape and the laminar flow condition in the turbulent state. With the increase of O 2 concentration, the ignition delay of pulverized coal particles decreases, which is more obvious in laminar flow regime. Pulverized coal particle groups in turbulent primary air tended to ignite heterogeneously, showing a continuous dark red flame; whereas in the laminar primary air, pulverized coal particle groups tended to ignite uniformly and due to insufficient local oxygen A bright yellow soot fire suddenly appeared at a height.