... rotary dryers for drying slag, limestone, coal powder, clay, sawdust, oil palm fiber, coconut fiber, grass, river stone, poultry dung, ... dust collector, furnace and etc. 3. heating source: coal, coal gas, natural gas, LPG gas, wood, and etc. 4. Mode of flow: direct flow ... our factory: innner structure We have successfully established 3 such oil palm fiber drying line in Malaysia, which operated very ...