... drying materials like sawdust,rice hull,milling wheat straw,corn stalks and so on.3.The dryer is ... boilers,inlet,steel pipe,exhaust blower,air lock and cyclone.Working principleIn the dryer, high-speed hot ... dried. Since air stream speed is very high, and materials suspending in air stream, the heat transfer ... surface between air and raw material is large, so the heat transfer ...