Working principle of rotor drum granulator

Compound fertilizer is composed of a variety of chemical fertilizers. Due to the influence of long-distance transportation and other factors, it is often produced by crushing and then granulating. The following is a brief introduction to the special granulating equipment-rotor drum granulator.

Working principle of rotor drum granulator

Firstly, each basic fertilizer is screened separately, and the screened material is crushed by a crusher and then screened. The under-sieve is sent to their respective hoppers. When the granulation system is in operation, the basic fertilizers are simultaneously sent from their respective hoppers to the feeding hopper via metering equipment, conveying equipment and lifting equipment in accordance with the proportioning requirements.

At the same time, the returned material enters the feeding hopper together with the basic fertilizer through the lifting equipment. The basic fertilizers and returned materials are mixed to a certain extent in the process of transportation and lifting, but it is more ideal if a mixing device can be added. The mixture in the feeding hopper is fed to the drum granulator at a certain feeding speed.

The saturated steam is properly introduced below the material layer, which not only increases the temperature of the material, but also humidifies the material, which is conducive to granulation. If necessary, sprinkle a small amount of water or fertilizer solution on the material to maintain the best liquid phase amount for material granulation. The material forms a rolling material bed by the friction generated by the rotation of rotor drum granulator. The squeezing force generated by rolling makes the material containing a certain liquid phase agglomerate into small particles. These small particles become the core and adhere to the surrounding powder.

Since the rotor drum granulator is generally inclined 1°～2.5° to the discharge end, the pellets will slowly roll toward the discharge port while rotating with the simplified simplified direction. Qualified pellets leave the drum granulator and then enter the dryer for drying, and then go through screening, cooling, coating, packaging and storage. After being crushed, the screened material and the screened material are sent to the hopper and the basic fertilizer to be re-granulated at the same time as the return material.