Fertilizer granulation machine equipment and systems, tongli rotary drum D compound NPK granulator used in 150,000 tons per year npk production line
How does a rotary fertilizer granulator work?
Material Feeding: Raw materials, usually a combination of nitrogen, phosphorus and potassium sources along with other additives, are fed into the rotating drum.
Liquid binder spraying: A liquid binder, typically water or a solution containing phosphoric acid or ammonia, is sprayed onto the material inside the drum. This helps to clump the particles together and form granules.
Granule formation: As the drum rotates, the material inside it rolls and tumbles. The combination of the spinning action and the liquid binder causes the particles to adhere to each other, forming granules.
Drying: After the granulation process, the granules may still contain excess moisture. To remove this moisture and stabilize the granules, the product normally passes through a dryer, which can be a separate unit or integrated into the granulator itself.
Sieving and coating (optional): Once dry, the granules can be sieved to remove oversized or undersized particles. They may also be coated with additional nutrients, coatings or anti-caking agents to improve their quality and handling characteristics.
What is the structure of a rotary drum granulator?
Rotary Drum: Main component where the granulation process takes place. It is typically made of stainless steel or coated with rubber for durability.
Motor and drive system: Provides the energy needed to rotate the drum.
Support structure: Supports the drum and other components.
Liquid Spray System: Consists of nozzles or sprayers that evenly distribute the liquid binder over the material inside the drum.
Discharge Chute: Allows the granulated product to leave the drum and be transported to subsequent processing steps.
Drying system (optional): If integrated, this system includes a heat source, such as a burner or electric heater, and a means of moisture removal, such as a stream of warm air.
Control System: Regulates granulator operation, including drum speed, liquid spray rate and temperature control for drying.
Overall, the rotary drum granulator offers an efficient and versatile method for producing compound fertilizers in a continuous process.
What is the difference between steam drum granulation and roller extrusion granulation?
Steam granulation involves using steam as a binder to agglomerate fine powder particles into granules. In this process, dry powder particles are mixed with a small amount of water and then exposed to steam, which causes the particles to become sticky and adhere to each other, forming granules. The granules are then dried to remove excess moisture and improve their stability.
On the other hand, roller press extrusion granulation uses mechanical pressure to compact and agglomerate powder particles into granules. In this method, the powder is fed between two counter-rotating rollers, which exert high pressure on the powder, forcing it to form dense, uniform granules. Granules produced by roller press extrusion granulation typically have a higher density and better flow properties compared to those produced by steam granulation.
Overall, although both steam granulation and roller press extrusion granulation are effective techniques for producing granules, they differ in their mechanisms of action and the properties of the granules they produce.
Date: 2024–3–8
Email: info@tlzjmachinery.com
