... ,2600mm,2800mm,....,4200mm.2.What's the usage of rotary dryer?Rotary drier is widely used for drying materials in the ... feeding and discharging equipment, dust catcher, etc.4.Rotary dryer working principle:Rotary drier adopts direct flow type of heating with heat ... dryer so that avoid the material from sticking the wall. Wide application, easy operation, light maintainence work and stable quality. ...