... 50tph 1. What the rotary dryer can be used for ?This dryer can dry many kinds of materials which ... driving device, supporting device and sealing ring.3. Can I use the coal or gas as the heating source?Yea, ... you can use coal, gas, electricity, oil and wind power ... gas, and electricity and other fuel. 3. We can design the gas generator furnace, firebox, and euipped elevator ...