To prevent or mitigate furnace slagging, it is necessary to first identify the causes of slagging and then take corresponding measures. If slagging occurs due to reasons such as the furnace being too small, insufficient water-cooled wall area, or a decrease in coal ash fusion point, generally, the only option is to reduce the load during operation. If improper operation leads to a skewed flame center causing slagging, or if improper air distribution results in incomplete combustion and the appearance of a reductive atmosphere causing slagging, operational techniques should be improved to prevent slagging.
For the prevention of slagging, fuel management should be properly conducted. Especially when there are frequent changes in coal types, timely coal quality analysis reports should be provided to operating personnel so that they can promptly take measures. The fineness of coal powder should be maintained evenly, avoiding fluctuations or excessive coarseness. During boiler operation, one should constantly observe for any signs of slagging. If slagging is detected, it should be removed promptly to prevent its aggravation.
During boiler maintenance, accumulated slag should be thoroughly cleared, and the smoothness of the water-cooled wall surface should be maintained. Suitable anti-slagging measures should be taken at locations where slagging frequently occurs.
... Edited and organized by the Beijing Hermann Wall-Hung Boiler Repair Center.
Hermann Wall-Hung Boiler: How to Prevent Furnace Slagging?