Dryer Cooler NPK Rotary Drum Fertilizer Granulating System

Thermal management during moisture removal and rapid cooling is critical to preventing granule deformation, surface cracking, and moisture regain in compound fertilizer production. The Dryer Cooler NPK Rotary Drum Fertilizer Granulating System is an integrated wet granulation and thermal-processing line engineered specifically for chemical formulations including urea, ammonium nitrate, DAP, MAP, and muriate of potash (MOP).

Fine raw materials are homogenized and fed into the rotary drum granulator, where atomized water or low-pressure steam triggers wet agglomeration as the material tumbles along the inclined cylinder. Immediately following pelletization, wet green granules enter the thermal processing circuit: a counter-current or co-current rotary drum dryer rapidly removes moisture below 1.5%, while a high-airflow rotary cooler rapidly drops material temperature to prevent caking and lock in particle hardness. The full system seamlessly connects dynamic belt-batching scales, pulverizers, the drum granulator, drying and cooling cylinders, cyclone dust collectors, multi-stage rotary screens, an anti-caking coating drum, and automated packaging machinery. Built by Gofine Machine with heavy cast steel drive gears, thick heat-resistant drum shells, and flexible anti-stick internal liners, it delivers continuous 24/7 reliability and granulating yields over 90%.

To ensure operational stability and long-term reliability, the Gofine rotary drum granulator incorporates several precision-engineered features:

• Corrosion-Resistant Interior: The internal drum is lined with specialized UHMW-PE (Ultra-High Molecular Weight Polyethylene) or acid-resistant stainless steel plates. This minimizes material sticking and protects the shell from the corrosive nature of ammoniated compounds.
• Enhanced Granulation Rate: Through the optimization of drum inclination (typically 2.0% to 5.0%) and rotational speed, the system achieves a granulation rate exceeding 90%, with fewer fines requiring recycling.
• Steam Injection Technology: Integrated steam piping allows for the adjustment of material temperature and moisture levels, ensuring optimal plasticity for granule formation without relying on excessive liquid binders.
• Heavy-Duty Transmission: Featuring a large cast steel gear and a high-performance motor-reducer assembly, the unit maintains stable torque even under full-load conditions (capacities ranging from 1 t/h to 20 t/h).

This granulation system is highly versatile and suitable for:

• High-Concentration Compound Fertilizer: Producing formulas like 15-15-15 or 20-20-10.
• Ammoniation Granulation Processes: Integrating liquid ammonia, phosphoric acid, or sulfuric acid.
• Organic-Inorganic Mixtures: Processing bio-organic materials that require a specific moisture-heat balance for pelletizing.

The production sequence in the drum is a coordinated mechanical and chemical process:

• Material Feeding: Base powders (such as Urea, MAP, or Potassium Chloride) are fed into the rotating drum at a constant rate.
• Ammonia/Steam Injection: Under the rolling bed of material, gaseous ammonia steam are injected. The resulting chemical heat and moisture soften the particles.
• Rolling & Agglomeration: As the drum rotates, the softened materials collide and adhere to each other, forming spherical "seeds" that grow into full-sized granules through centrifugal force.
• Discharge: The finished granules exit the drum and are conveyed to drying and cooling units to finalize their structural hardness.

As a specialized manufacturer, we focus on equipment longevity and process efficiency. Our designs prioritize minimized maintenance intervals and stable operational performance. We provide comprehensive layout designs and technical support to ensure the equipment integrates seamlessly into your existing production plant.