Rotary Drum Cooler

    Rotary Drum Cooler

    Function​: Continuous cooling of  bulk solids after drying.
    Cooling Method​: Air-Swept / Water Jacket
    Cooling Air Volume​: 5,000 – 150,000 m³/h​ 
    Cooling Rate​: Ambient Temp + 5°C ~ +15°C​ (Outlet temperature)
    Drum Diameter & Length​: Φ0.6×8m – Φ3.6×28m​ (Customizable based on retention time)
    Material Retention Time​: 15 – 60 Minutes​ 
    Construction Material​: Q345R Carbon Steel / SS304 
    Dust Control​: Integrated Cyclone Dust Collector & Air Seal System​

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    The Rotary Drum Cooler​ is an essential downstream piece of equipment for any high-temperature granulation or drying process. It is designed to rapidly reduce the temperature of hot, freshly processed materials (such as fertilizer granules, pellets, or minerals) using ambient air.
    By employing a counter-flow air-swept design, the cooler ensures uniform heat exchange between the material and the cooling air. This process is critical for preventing caking, improving product hardness, and ensuring materials are safe for bagging, storage, and transportation.

    Working Principle

    The cooling process relies on forced convection and controlled residence time.
    1. Feeding:​ Hot material (typically 60°C–120°C) enters the rotating drum via a sealed inlet.
    2. Lifting & Showering:​ As the drum rotates, internal flights (lifters)​ lift the material and shower it through the air stream. This maximizes the surface area exposed to the cooling air.
    3. Counter-Flow Heat Exchange:​ Cold air is drawn into the drum from the discharge end, moving opposite to the material flow. This counter-flow design achieves the highest thermal efficiency.
    4. Discharging:​ The cooled material exits the drum at a safe temperature (Ambient + 5°C to 15°C), while the heated exhaust air is directed to dust collection systems.

    Key Features

    ✔️Optimal Cooling Performance:​ Reduces material temperature to Ambient + 5°C ~ +15°C, preventing moisture condensation during storage.
    ✔️Prevents Caking:​ Rapid cooling stabilizes the crystal structure of granules (especially NPK), ensuring free-flowing product.
    ✔️Robust Construction:​ Heavy-duty steel drum with wear-resistant lifters designed for continuous 24/7 operation.
    ✔️Energy Efficient:​ Utilizes ambient air instead of refrigeration, minimizing operating costs.
    ✔️Dust Control:​ Integrated air seals and optional cyclone dust collectors maintain a clean working environment.

    Customization Options

    🔹1. Cooling System Design
    Tailored to your material temperature and ambient conditions.
    Air-Swept (Counter-flow):​ Most common; highest cooling efficiency for granules and pellets.
    Parallel-flow:​ For fragile materials requiring gentle handling.
    🔹2. Mechanical Structure
    Built to match your plant layout and retention time requirements.
    Drum Size:​ Custom diameter (Φ0.6m–3.6m) and length to achieve required residence time.
    Flights (Lifters):​ Custom lifting/spreading flight geometry for uniform air-material contact.
    Inclination Angle:​ Adjustable (typically 1°–5°) to control material flow rate.
    Support Base:​ Fixed foundation mounts or mobile skid-mounted frame.
    🔹3. Material of Construction (MOC)
    Selected based on corrosiveness and abrasiveness of the material.
    Carbon Steel (Q235/Q345R) / Stainless Steel (SS304/316L)
    🔹4. Auxiliary Equipment Integration
    We supply the complete cooling circuit, not just the drum.
    Induced Draft Fan / Forced Draft Fan:​ Matched to system pressure drop.
    Cyclone Dust Collector / Bag Filter:​ For particulate emission control.
    Air Lock / Rotary Valve:​ At discharge to prevent air short-circuiting.
    Pre-cooling Section:​ Extended inlet zone for extremely hot materials (>150°C).
    Documentation:​ GA drawings, foundation plans, O&M manual, and test certificates provided.

    Applications

    Our Rotary Drum Coolers are vital components in various production lines:
    Fertilizer Industry:​ NPK compound fertilizer, urea, bio-organic fertilizer, potassium sulfate.
    Pelletizing Plants:​ Animal feed pellets, wood pellets, biomass fuel pellets.
    Mining & Minerals:​ Cement clinker, activated carbon, bentonite, mineral concentrates.
    Chemical Industry:​ Plastic resin pellets, sulfur granules, chemical salts.

    Complete Production Line Integration

    From raw material intake to final product dispatch. Our expertise extends beyond rotary coller to encompass roraty dryer, conveyors, millers, screener, and packing systems. We build cohesive production lines that maximize efficiency and reduce operational costs.

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    FAQ

    Proper selection is based on thermal calculation, not just guesswork. To specify the correct model, please provide:
    Material Properties:​ Name, bulk density, specific heat capacity, and inlet temperature.
    Target Capacity:​ Required throughput in tons per hour (TPH).
    Target Temperature:​ Desired outlet temperature (usually Ambient + 5°C to 15°C).
    Ambient Conditions:​ Average local air temperature and humidity.
    Our engineering team calculates the required heat transfer area​ and air volume​ to ensure the cooler meets your production demands.

    We ensure a smooth startup process with comprehensive support:
    Documentation:​ Detailed General Arrangement (GA) drawings, foundation plans, and electrical schematics provided 2 weeks before delivery.
    Remote Guidance:​ Lifetime remote technical support via video call for installation supervision and troubleshooting.
    On-Site Service:​ For large-scale projects, we dispatch experienced engineers to your site for mechanical/electrical installation, commissioning, and staff training.
    Training:​ Operators receive hands-on training for daily operation, safety procedures, and basic maintenance.

    Yes, absolutely.​ We are a full-service equipment provider for bulk material handling.
    Other Equipment:​ Rotary Dryers, Crushers, Mixers, Belt Conveyors, Bucket Elevators, Vibrating Screens, Dust Collectors.
    Turnkey Solutions:​ We design and integrate complete production lines​ (e.g., Feeding → Drying → Cooling → Screening → Packaging). We provide single-source responsibility for the entire project.

    Lead times depend on the complexity and material availability:
    Standard Models:​ 2–3 weeks​ after deposit confirmation.
    Customized Models:​ 4–6 weeks​ (depending on material procurement and machining).
    Complete Production Lines:​ 6–8 weeks​ (detailed schedule provided upon contract signing).

    Why Choose Botek Machinery

    1. 15+ Years of Manufacturing Excellence
    Extensive experience in industrial machinery, drying, screening, conveying, crushing, and mixing, packing systems.

    2. Global Certifications & Compliance
    Compliance with ISO, CE, ATEX, UL, CSA, and more—guaranteeing quality and smooth customs clearance.

    3. Rapid Pre-Sales Engineering
    Get a free quote, proposal, and CAD layout​ from our engineers within 12 hours​ of your inquiry.

    4. Custom & Turnkey Solutions
    One-stop sourcing for single machines or complete production lines​ tailored to your specs. From raw material intake to final packaging.

    5. Zero-Risk Pre-Shipment Test
    Free material testing​ at our factory with video verification before shipment.

    6. Fast Delivery & Global Support
    Standard models in 3-4 weeks; custom orders in 4-5 weeks. Global installation support available.

    7. Direct Factory Pricing
    Competitive prices with no middleman markups. Maximize your ROI.

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