Rotary Drum Granulation Line

Characterized by high single-unit capacity and closed-loop design, suitable for large-scale, high-output organic fertilizer production. Produces round, uniform granules with high strength. Capacity range: 3–30 TPH.

Production Line Overview

Centered around the drum granulator, this line integrates crushing, mixing, screening, drying, cooling, and packaging systems to enable fully automated processing from raw materials to finished products. With high capacity, excellent granulation rate, and stable performance, the drum granulation line has become the preferred process solution for medium and large organic fertilizer projects worldwide.

The Drum Granulation Line is one of OFEC’s core products, designed for large-scale, continuous production of organic fertilizer and organic-inorganic compound fertilizer.

Production Line Specifications

Parameter	Details
Suitable Raw Materials	Livestock manure, straw, biogas residue, sludge, food waste, organic waste, etc.
Granulation Method	Drum agglomeration (wet process)
Capacity Range	3–30 t/h (customizable)
Pellet Shape	Spherical or oval, diameter 2–8 mm
Drying Method	Rotary drum dryer with heat sources: coal, gas, oil, or biomass
Final Moisture Content	≤15%
Line Configuration	Batching, crushing, mixing, granulation, drying, cooling, screening, coating, packaging, dust collection

Parameter

Details

Suitable Raw Materials

Livestock manure, straw, biogas residue, sludge, food waste, organic waste, etc.

Granulation Method

Drum agglomeration (wet process)

Capacity Range

3–30 t/h (customizable)

Pellet Shape

Spherical or oval, diameter 2–8 mm

Drying Method

Rotary drum dryer with heat sources: coal, gas, oil, or biomass

Final Moisture Content

≤15%

Line Configuration

Batching, crushing, mixing, granulation, drying, cooling, screening, coating, packaging, dust collection

Working Principle of Organic Fertilizer Granulation

Drum granulation is a wet agglomeration process. The principle: inside a rotating, inclined drum, materials tumble and roll due to the drum’s rotation. Simultaneously, water, steam, or binding agents are sprayed to moisten fine powders, causing them to collide, compress, and adhere into small aggregates. As the drum continues rotating, the aggregates gradually densify and round into pellets. When they reach the desired size, they discharge from the outlet. After drying, cooling, and screening, the final product is high-strength, uniform organic fertilizer granules.

Advantages and Disadvantages for Organic Fertilizer Granulation

Advantages
● High Capacity: Single unit can handle up to 30+ t/h, ideal for large-scale, industrial production.
● Aesthetic Granules: Round, smooth pellets with good commercial value and market acceptance.
● Wide Raw Material Adaptability: Handles materials with 25%–35% moisture content; suitable for various feedstocks with pre-conditioning.
● Continuous Operation: Designed for 24/7 production with high automation and low labor costs.
● High Pellet Strength: Rolling compaction produces strong granules resistant to breakage during storage and transport.

Disadvantages
● Higher Initial Investment: More expensive than disc or extrusion lines.
● Higher Energy Consumption: Requires drying system – both thermal and electrical energy consumption are relatively high.
● Large Footprint: Long production line needs ample space.
● Dust Control Requirements: Inlet/outlet and screening sections may generate dust; efficient dust collection is essential.

Advantages

High Capacity

Single unit can handle up to 30+ t/h, ideal for large-scale, industrial production.

Aesthetic Granules

Round, smooth pellets with good commercial value and market acceptance.

Wide Raw Material Adaptability

Handles materials with 25%–35% moisture content; suitable for various feedstocks with pre-conditioning.

Continuous Operation

Designed for 24/7 production with high automation and low labor costs.

High Pellet Strength

Rolling compaction produces strong granules resistant to breakage during storage and transport.

Line Configuration

Batching, crushing, mixing, granulation, drying, cooling, screening, coating, packaging, dust collection

Disadvantages

Higher Initial Investment

More expensive than disc or extrusion lines.

Higher Energy Consumption

Requires drying system – both thermal and electrical energy consumption are relatively high.

Large Footprint

Long production line needs ample space.

Dust Control Requirements

Inlet/outlet and screening sections may generate dust; efficient dust collection is essential.

Contact a Process Engineer to evaluate the technical solution.

Donne: donne@emccindustry.com

OFEC Drum Granulation Line Advantages

Proven Process

Each drum line is optimized based on global project data, achieving a granulation rate of 85%–95% with energy efficiency better than industry average.

Customizable Drum Materials

Carbon steel, stainless steel, rubber liners, or wear-resistant steel plates – suitable for different material corrosiveness and abrasion levels.

Tailored Lifting Flights

Lifting flights are designed according to feedstock characteristics (viscosity, moisture, density) to maximize granulation efficiency.

Intelligent Control System

PLC auto‑control monitors rotation speed, inclination angle, feed rate, and liquid spray volume for stable operation.

Turnkey Delivery

OFEC provides full services – design, manufacturing, installation, commissioning, and training – minimizing coordination burdens.

Complete eco-support

Integrates pulse dust collectors, spray towers, etc., to meet local emission standards.

Equipment List of the Drum Granulation Line

Equipment	Function
Batching System	Continuous batching of 2–8 materials with precise ratio control
Crusher	Vertical/horizontal chain crusher – reduces large lumps to suitable particle size
Mixer	Twin-shaft mixer – uniformly blends materials, moisture, and binders
Drum Granulator	Core equipment; drum diameter 0.8–4.5 m, capacity 1–200 TPH (typical for organic fertilizer: 3–30 TPH) – rolling agglomeration
Dryer	Rotary dryer – reduces pellet moisture to safe storage level
Cooler	Rotary cooler – lowers pellet temperature, prevents moisture regain
Screener	Trommel or vibrating screen – separates finished pellets from returns
Coating Machine	Optional – applies anti-caking agent or functional coating
Packaging Machine	Ton bag, open-mouth bag, or valve bag options; auto palletizing available
Conveying System	Belt, bucket, or screw conveyors – connects all equipment
Dust Collection System	Pulse jet bag filter – controls dust emissions
Combustion Unit / Boiler	Provides heat for the dryer; works with gas, oil, biomass, etc.

Equipment

Function

Batching System

Continuous batching of 2–8 materials with precise ratio control

Crusher

Vertical/horizontal chain crusher – reduces large lumps to suitable particle size

Mixer

Twin-shaft mixer – uniformly blends materials, moisture, and binders

Drum Granulator

Core equipment; drum diameter 0.8–4.5 m, capacity 1–200 TPH (typical for organic fertilizer: 3–30 TPH) – rolling agglomeration

Dryer

Rotary dryer – reduces pellet moisture to safe storage level

Cooler

Rotary cooler – lowers pellet temperature, prevents moisture regain

Screener

Trommel or vibrating screen – separates finished pellets from returns

Coating Machine

Optional – applies anti-caking agent or functional coating

Packaging Machine

Ton bag, open-mouth bag, or valve bag options; auto palletizing available

Conveying System

Belt, bucket, or screw conveyors – connects all equipment

Dust Collection System

Pulse jet bag filter – controls dust emissions

Combustion Unit / Boiler

Provides heat for the dryer; works with gas, oil, biomass, etc.

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