单角试验炉煤粉射流着火可视化试验研究

本文通过一个图像采集与处理系统，将单角试验炉煤粉射流着火火焰锋面从背景中分离出来。将火焰锋面到燃烧器出口的最近距离定义为着火距离，对一种烟煤的试验研究结果表明，随着煤粉浓度的提高，其平均着火距离明显缩短。具有较高稳定性的钝体燃烧器的煤粉射流着火，倾向于在分离射流的外侧首先出现。

Experimental Study on Visualization of the Ignition of Pulverized Coal and Air Stream in a Laboratory Scale Single Burner Furnace

It is reported in this paper that the ignition front of the pulverized coal and air stream in a laboratory scale single burner furnace is separated from its background by an image processing system. The ignition distance is defined as the shortest distance of the flame front to the outlet of the burner, and the experiments show that the average ignition distance is shortened obviously as the coal concentration increases for a kind of bituminous coal. For a normal bluff body burner with a higher combustion stability, its ignition of pulverized coal and air stream tends to occur firstly at the stress layer in the outer side of the separated stream behind the burner.