Changzhou City Ouna and take drying equipment Co., Ltd. of the active carbon dryer due to the compact device structure, and the auxiliary device, heat loss is also reduced. The heat utilization rate can reach 80% - 90%. From the device structure, it is known that the heat required for drying is mainly provided by the wall surface of hollow blades arranged on the hollow shaft, and the heat transfer quantity of the wall surface of the jacket is only a small part. So the heat transfer surface of unit volume equipment is large, which can save equipment floor area and reduce the investment of capital construction.