Why does a slag dryer emit black smoke during operation?

1. When the slag dryer is operating, the material has a high moisture content, and the particles to be dried are relatively coarse. During the drying process, the low temperature and high moisture content of the material, under conditions of significant temperature differences, makes it more prone to emitting black smoke.

2. The quality of the coal in the slag dryer's combustion furnace may be poor. If the coal quality is poor, it may not burn completely during the tailings drying process, resulting in a large amount of black smoke. Coal with low volatility, high moisture content, and coarse particle size is most likely to produce black smoke. This not only fails to ensure sufficient heat inside the dryer but also wastes resources.

3. During the feeding process of the slag dryer, if the feeding speed is too fast and too much material is added, the drying speed may not be able to keep up with the feed rate. This can cause the material to accumulate inside the drying drum, preventing effective heat exchange with the airflow. If the rear ring of the slag dryer is severely damaged, it can easily affect ventilation. Poor ventilation leads to incomplete combustion of fuel, which is carried out of the furnace, resulting in thick black smoke.

4. If the airflow of the slag dryer is not properly controlled, the airflow during the drying process will affect the heat and temperature inside the equipment, as well as the heat transfer between the material and the hot airflow. Insufficient airflow may result in poor ventilation, easily producing a large amount of black smoke.

If the slag dryer emits black smoke during operation, the cause must be investigated and resolved promptly to ensure good drying results and quality. Correct and standardized operation, daily maintenance and inspection, and timely detection of potential problems are essential for the normal and efficient production of the equipment.