The material enters the inner layer of the rotary drum from the feeding device to realize the downstream drying. The material is continuously picked up and scattered under the inner plate in a spiral way to realize the heat exchange. The material moves to the other end of the inner layer and enters the middle layer for counter-current drying. The material is continuously lifted in the middle layer repeatedly, in a two-step and one-step way. The material in the middle layer not only fully absorbs the heat emitted by the inner drum, but also absorbs the heat of the middle drum, At the same time, the drying time is extended, and the material reaches a good drying state here. The material moves to the other end of the middle layer and falls into the outer layer. The material moves in a rectangular multi-circuit way in the outer drum. The material that has reached the drying effect moves quickly under the action of hot air and is discharged from the drum. The wet material that has not reached the drying effect cannot move quickly because of its own weight. The material is fully dried in this rectangular sheet, thus completing the drying purpose.
The round particles with high moisture content from the organic fertilizer particle shaping section are transported to the feeder of the tubular dryer through the conveyor belt, and the granular materials with chute in the feeder directly enter the rotating drying drum. With the rotation of the drying drum, the granular organic material will be brought up at a certain angle. When installing the drying main pipe and drying branch pipe, the included angle between the main pipe and the horizontal ground coincides with the material picked up. The picked up granular material buries the outlet end of the drying branch pipe, so that the granular material can fully contact with the hot air and prevent heat loss. After the particles are heated, hot water vapor will come up to the upper end of the drying drum. Under the action of high-power induced draft fan for outdoor dust removal and water vapor removal, water vapor dust, etc. will be discharged from the drying device through the air inlet. Finally, the dry organic fertilizer granule material with low moisture is discharged from the material outlet and enters the next cooling section.
Applicable scope of drum dryer:
It is applicable to grains with high water content and high viscosity, such as beer lees, starch lees, rice bran lees, and various residue materials, such as bean dregs, cassava dregs, bean dregs, sweet potato dregs, potato dregs, sugar dregs, fruit dregs, sauce dregs, livestock and poultry excrement, sludge and peat, and other high-moisture materials, and is more suitable for the treatment of livestock and poultry excrement in large, medium and small farms, the production of organic fertilizer from livestock and poultry excrement, compound fertilizer, organic-inorganic compound fertilizer, sludge, grain, food, biogas residue High humidity materials such as medicine residue.