NPK fertilizer production line usually adopts drum granulation technology, using drum granulator to produce fertilizer in large quantities. Rotary drum granulator is the key to compound fertilizer production. We can improve the granulation process of fertilizer, improve the granular quality of NPK fertilizer production line and reduce production costs.
When NPK material enters the rotary drum granulator, the particle swarm moves along the axis of the drum granulator under the frictional action of the cylinder wall, and its circumferential velocity varies with the distance of the particle from the center of the circle. In the process of material layer moving along the axis and sliding down along the inner wall of the rotary drum, due to the difference of particle diameter and the gap between particles, the material is divided into several layers in the drum. The particles are classified and there is relative movement between the layers. Finally, the agglomeration and granulation of materials are discharged from the drum granulator.
When NPK particulate material is classified by screening machine, the powder material contains some large particles which can not meet the requirements of granulation. The particulate material should be sent to the chain crusher with larger crushing capacity for crushing. Chain crusher crushes particles, and the NPK fertilizer can be regranulated after it becomes powder, thereby improving the production efficiency of the NPK fertilizer production line. After the fertilizer granules are processed by drum granulator, they must be dried to strengthen the granules, so that the water content of the granules can meet the requirements of product water content. We improved the drum dryer to improve the quality of particle drying. A lifting board is set on the cylinder of the dryer to increase the contact area of the material, increase the hot air temperature and flow rate moderately in the drying process, and strengthen the drying process.