The dry wet material is transported to the hopper by a belt conveyor or bucket elevator, and then enters the feeding end through the feeding machine of the hopper through the feeding pipeline. The slope of the feeding pipeline should be greater than the natural inclination angle of the material, so that the material can flow smoothly into the dryer. The dryer cylinder is a rotating cylinder that is slightly inclined to the horizontal line. The material is added from the higher end, and the heat carrier enters from the lower end, forming a countercurrent contact with the material. There are also heat carriers and materials flowing together into the cylinder. As the cylinder rotates, the material is subjected to gravity and moves to the lower end. During the forward movement of wet materials in the cylinder, they directly or indirectly receive heat from the heat carrier, allowing the wet materials to dry and then be sent out at the discharge end through a belt conveyor or screw conveyor. There is a plate installed on the inner wall of the cylinder, which is used to pick up and scatter the material, increasing the contact surface between the material and the airflow, in order to improve the drying rate and promote the material to move forward. Heat carriers are generally divided into hot air, flue gas, etc. After the heat carrier passes through the dryer, a cyclone dust collector is generally required to capture the materials carried in the gas. If it is necessary to further reduce the dust content in the exhaust gas, it should also be discharged after passing through a bag filter or wet dust collector.