The coal grinding mill is one of the main equipment of coal powder production system in the thermal power plant. In cement plant, the coal grinding mill can be used for drying  powder and grinding  pulverized coal. As a dry-grinding equipment, the coal mill can  not only  be applied in cement, metallurgy, chemical ,coal and raw ore milling system, but also can be commonly used in the industrial boilers, chemical plants, refractory plants, ceramic product plants and other industries. Coal mill is one of the four auxiliary equipments of thermal power stations. Coal of various hardness are  grinded by the coal grinding mill. Coal can be broken into powder in the mill, which is an important auxiliary equipment for the pulverized  coal furnace. In the process of grinding the coal, the coal is constantly be broken, after overcoming the binding force between solid molecules, the surface area will also continue to increase. Pulverized coal is mainly made by crushing and grinding.  The  energy consumption is lowest in the crushing process,but the pulverization process consumes more energy.