This kind of dryer is mainly used to prepare suitable moisture raw material for biomass pellet press. It is only to control the moisture of raw material at a reasonable range that can make good result of biomass pelletizing. Or the pellets will be broken because of too loose or too dry.

The whole system consists of fan blower, motor engine, fuel boiler, steel pipe, cyclone and air lock. In this system, wet material is input into hopper by screw feeder. Fuel furnace produces large volume of hot air. Those hot air is driven into steel pipes, mixed with wet sawdust and moved through curving pipes and drying chamber by the power of fan blower. Fast moving hot air sustains and is mixed with raw material sent by spiral feeder in the suspending state through the steel pipe; moisture evaporates as the material traverses along the steel pipe and is rendered dry at the discharge end. Humid air is continuously exhausted, thus the material is dried.

Sawdust air flow pipe dryer