Paddle dryer is a horizontal mixing dryer mainly based on conduction. The main structure of the blade dryer is a W-shaped shell with a jacket, which is equipped with paired hollow low-speed reverse hollow shafts. The shafts are welded with several mixing blades, and the jacket and hollow mixing blades are both connected to a heat carrier. The two heating surfaces heat the material together. The heat carrier is usually fed from the middle of the dryer, passes through the surface of the mixed material layer, and is discharged from the other side. Because the heat required by the blade dryer during drying is directly heated through thermal conduction, the drying process only requires a small amount of gas to remove moisture, which greatly reduces the loss of heat carried away by the gas and improves the utilization rate of heat. The force drying hollow blade dryer is an energy-saving drying equipment. It is suitable for drying granular and powder materials, and can also smoothly dry paste materials.

Wedge shaped hollow blades are densely arranged on the hollow shaft, and the heat medium flows through the blades through the hollow shaft. The heat transfer area within a unit of useful volume is large, and the temperature of the heat medium ranges from -40 to 320 ° C. It can be in the form of water vapor or liquid, such as hot water, heat transfer oil, etc. Direct conduction heating does not carry away heat with the air. The heat is used to heat the material, and the heat loss is only due to the heat dissipation to the environment through the insulation layer of the device. The wedge-shaped blade heat transfer surface has a self-cleaning function, and the relative motion between material particles and the wedge-shaped surface produces a washing effect, which can wash away the attached materials on the wedge-shaped surface and maintain a clean heat transfer surface during motion.