Drum Fertilizer Cooler
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Drum Fertilizer Cooler
In a granular fertilizer production line, the drum fertilizer cooler is positioned after the drying stage and before the screening and coating stages; it is a critical piece of equipment for transforming high-temperature granules into finished products at ambient temperature. If dried material is screened without timely cooling, the granules—having low strength—are prone to breakage, and screens easily become clogged or sticky; furthermore, packaging hot material can lead to caking and moisture re-absorption. The cooler’s capacity is matched to that of the dryer, and its cooling performance directly affects screening efficiency, granule strength, and shelf life, making it a vital process step for ensuring stable production and product quality.
Cooling Process
The granular fertilizer cooling process utilizes continuous air cooling. Material discharged from the dryer at 60–90°C enters directly into the cooler’s feed end.
An induced draft fan draws ambient air into the drum from the discharge end, facilitating heat exchange through counter-current contact with the material. Inside the drum, lifting flights repeatedly lift and scatter the material, ensuring the granules make full contact with the cooling air to lower their temperature.
After cooling, the material—now at a temperature 5–8°C above ambient—is discharged and proceeds to the screening machine for classification. Exhaust gas is treated via cyclone and bag-house dust collectors before being released.
Process Advantages
Continuous operation synchronized with the dryer, ensuring smooth material flow.
Controllable cooling process; discharge temperature is precisely regulated by adjusting airflow.
High heat exchange efficiency due to counter-current cooling; discharge temperature is low and uniform.
Further moisture removal occurs during cooling, resulting in lower final moisture content and safer storage.
Simple equipment structure, reliable operation, and low maintenance costs.
How to Select a Drum Fertilizer Cooler?
Selection should be based on matching the capacity of the dryer; the cooler’s throughput should be 1.0 to 1.1 times the dryer’s output to provide a safety margin.
Drum diameter and length are determined based on throughput and material residence time. For organic fertilizer granules, a large-diameter, low-speed model is recommended to minimize granule breakage. For compound fertilizer granules, a standard-speed model is suitable.
Induced draft fan airflow is calculated based on material feed temperature and production rate to ensure sufficient cooling capacity. Design airflow may be reduced for cold regions, whereas hot and humid regions require increased airflow and consideration of air dehumidification. The intake air for the cooling unit should be drawn from a dry outdoor location to avoid the intake of humid air, which would impair cooling performance.
