Rotary Drum Cooler for Fertilizer Cooling System

Equipment in Action

In addition to fertilizer production lines, SYM can customize rotary drum coolers for mineral, chemical and other industrial applications based on specific material and process requirements.

Feature

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Counter-Current Cooling Design

Material and cooling air flow in opposite directions inside the rotary drum cooler, significantly improving heat exchange efficiency. This design ensures more thorough and uniform cooling while reducing energy consumption in the overall process.

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Optimized Flights Structure

The drum is equipped with spiral or staggered lifting flights that continuously lift and disperse the material to form a uniform curtain. This maximizes the contact area between air and particles and eliminates cooling dead zones.

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Low Breakage Operation

Optimized drum speed and inclination angle ensure controlled material movement throughout the cooling process. This reduces particle breakage while maintaining round granule shape and consistent particle size of compound fertilizers.

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Sealed Negative Pressure System

The rotary drum cooler operates under a sealed structure combined with induced draft fans. This effectively reduces dust emission, improves the working environment, and meets environmental protection requirements.

Structure

Rotary Drum

The main body consists of a slightly inclined rotating cylinder of thick steel plate, where material flows and exchanges heat with air.

Drive System

Driven by a motor, reducer, and large rotary cooler gear, ensuring stable and continuous rotation under load.

Supporting Assembly

Heavy-duty riding rings (tyre) and trunnion wheels support the drum and ensure smooth operation.

Thrust Roller System

Controls axial movement of the drum and maintains alignment during operation.

Sealing System

Equipped with rotary cooler seals at both ends to prevent air leakage and dust escape under negative pressure conditions.

Principle

The rotary drum cooler operates on a counter-current cooling principle. Hot fertilizer granules enter the drum from the higher end, while ambient air flows from the opposite direction.

As the drum rotates, internal flights lift the material to form a uniform curtain, allowing efficient heat exchange between air and particles. The material gradually moves along the inclined drum and cools to near ambient temperature at the outlet.

This process effectively removes residual heat, prevents crystal bridge formation, and ensures the stability of fertilizer granules during storage and handling.

Application

Fertilizer Industry

Widely used in NPK fertilizer production lines for cooling compound fertilizer, urea, ammonium phosphate, and organic-inorganic blended fertilizers.

Chemical Industry

Applied in cooling granular or bulk materials in chemical processing systems.

Mining and Metallurgy

Suitable for cooling minerals, slag, and other high-temperature bulk materials.

Feed and Grain Processing

Used for cooling pellets and granular materials in feed and grain production lines.

Advantage

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Continuous Production Support

The system allows immediate downstream processing such as screening and packaging after cooling, improving production efficiency.

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Energy-Efficient Operation

Counter-current cooling improves heat exchange efficiency while reducing energy consumption.

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Durable and Reliable Structure

Constructed with thick steel shell, high-strength alloy trunnion wheels, and large gear drive system for long-term stable operation.

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Easy Maintenance

Simple and robust structure allows convenient lubrication and inspection of key components such as support devices and transmission systems, with service life reaching decades.

Technical Specifications

Model	Inner Diameter (mm)	Length (mm)	Slope (°)	Speed (r/min)	Production Capacity (t/h)	Main Motor Power (kw)	Weight (t)
SYM-1814	1800	14000	2.5	3.08	~ 12	18.5	24.5
SYM-2016	2000	16000	2.5	3.0	~ 16	22	40
SYM-2215	2200	15000	2.5	3.33	~ 18	22	43
SYM-2418	2400	18000	2.5	2.58	~ 25	45	63
SYM-2622	2600	22000	2.5	2.58	~ 30	55	75
SYM-2824	2800	24000	2.5	3.5	~ 35	90	88
SYM-3024	3000	24000	1.8	4.3	~ 45	160	122
SYM-4215	4200	15000	1.0	3.5	~ 55	250	178

FAQ

1. What is the typical outlet temperature of the rotary cooler?

The discharge temperature is usually reduced to 30–40°C, depending on ambient conditions and system configuration.

2. Can it be used together with a rotary drum dryer?

Yes, it is typically installed after the dryer as part of a complete fertilizer production system.

3. How is dust controlled during operation?

The machine operates under sealed negative pressure, combined with a dust collection system to minimize emissions.

4. Is automation available for this cooling system?

Yes, PLC-based control systems can be integrated to monitor temperature, airflow, and drum speed in real time.

5. What is the typical capacity range?

From about 1 t/h for small systems to over 50 t/h for large-scale plants.

Rotary Drum Cooler