喷煤枪位于风口前端，采集得到的风口图像中心区域被喷煤枪及其所喷出煤粉形成的煤粉云遮挡，在该区域产生黑根。由于鼓风参数及煤粉流量随时间变化而变化，造成不同时刻所采集的风口图像中煤粉黑根面积不同。图像中出现面积较小的黑色区域为焦炭颗粒或未熔化的原料。

The coal injection gun is located in the front of the tuyere, and the central area of the collected image is blocked by the coal injection gun and the pulverized coal cloud formed by the pulverized coal emitted by the coal injection gun, resulting in black roots in the area. Due to the change of blast parameters and pulverized coal flow rate with time, the black root area of pulverized coal is different in the images collected at different times. The black area with small area in the image is coke particles or unmelted raw materials.