Coal Mill Classifier Repair PROBLEM Case Studies The Coal Mill Classifier Cone directs the pulverized coal out of the mill and into the furnace. Hot air, from the air side of the air preheater, is pulled through the coal mill by the exhaust fan (refer CH-801) picking up the fine coal dust and feeding it to the furnace. The classifier cone is generally lined with thick Alumina wear plates to protect the cone from the abrasive coal particles. With time, these plates wear down and must be replaced. Replacement is done both in the field and at the manufacuterer. The replacement wear plates are metal backed with a hole in the center to allow welding to the metal classifier cone. The problem is to protect the weld holes after installation, and to a lesser extent, the edges where each plate meets

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