... rotary dryers for drying slag, limestone, coal powder, clay, sawdust, oil palm fiber, coconut fiber, grass, river stone, poultry dung, ... gearbox, electric motor, cyclone dust collector, furnace and etc. 3. heating source: coal, coal gas, natural gas, LPG gas, wood, and ... our factory: innner structure We have successfully established 3 such oil palm fiber drying line in Malaysia, which operated very ...