... 8-12% 2.the working principle:hot-air drying Dryer machineWood dryer is suitable for drying materials like sawdust, rice hull, milling wheat straw, ... is at 20-30%. The wood dryer is equipped one fuel boiler, inlet, steel pipe, exhaust blower (fan), cyclone. Wet ... materials are input into the hopper. The fuel boiler generates hot air which mixes ...