Coffee grounds are the residue from brewing coffee. Once dried, coffee grounds can be used to make pellet fuel or used as compost to fertilize crops.

   Dingli coffee grounds dryer consists of a heating furnace, a feed port, a drum, a filter drum, a conveyor pipe, a cooling drum, a discharge port, etc. The crushed materials with a moisture content of about 35-45% are sent to the drum by the conveyor to achieve downstream drying. Materials are continuously picked up and scattered under the inner layer of the lifting plate, and advance in a spiral shape. After passing through the inner, middle and outer layers, the material exchanges heat with the hot air, and the material that has reached the drying effect is quickly moved out of the drum under the action of the wind. Wet materials that have not reached the drying effect cannot move quickly due to their own weight. The materials are fully dried within the control stroke, thereby achieving the drying effect. The moisture content of the material is reduced to 12-15%, the drying process is completed, and it is discharged by the screw conveyor. The drum is equipped with a vibration cleaning device to prevent materials from adhering to the drum wall.