Core Principle: Wet Agglomeration Granulation
Scale Types: Small, Medium, Large
Daily Production Capacity: 2-8 tons, 10-40 tons, 40-60 tons
Floor Area: 500-800 ㎡, 1000-2000㎡, 3500+㎡
Product: Granular organic fertilizer
Applications: Family farms, small cooperatives, large-scale livestock breeding operations, large-scale fertilizer production bases, environmentally friendly sludge treatment projects, etc.
1. Pretreatment Module
● Pulverizer: Grinds composted raw materials, such as straw, to a particle size of ≤3mm to prevent large lumps from affecting the granulation rate;
● Screener: Separates the coarse and fine materials after pulverization, returning the coarse materials to the pulverizer for secondary pulverization;
● Mixer: Evenly mixes the fine materials with water/binder, adjusting the moisture content to 25%-35%, ensuring the material is smooth and uniform. "Gathers into clumps when held in the hand, falls apart when dropped to the ground"
2. Granulation Module
● Rotary Drum Granulator: The core of the production line, agglomerates the material into granules
3. Post-Processing Module
● Dryer: Dries the granules at low temperatures to ensure granule strength and storage stability;
● Cooler: Cools the dried granules to room temperature to prevent clumping and mold after packaging;
● Grading Screen: Screens qualified granules, returning large particles to the crusher and fine particles to the mixer for re-granulation;
● Packaging Machine: Packages qualified granules in fixed quantities and is equipped with a weighing sensor;
4. Auxiliary Equipment
● Conveyor Belt: Connects various equipment to ensure continuous material transportation
● Dust Collector: Treats dust generated by the crusher and dryer to meet environmental emission requirements
● Control System: Standard feature of automated production lines, monitors the speed, temperature, and flow rate of each device, enabling one-touch start and stop, and provides fault alarms.
The core of the drum granulation production line is "wet agglomeration granulation," which achieves granule formation through the following steps:
1. Pretreatment: The raw materials are first crushed and screened to ensure uniform particle size. They are then mixed with an appropriate amount of water in a blender to adjust the moisture content.
2. Granulation: The pretreated wet materials enter the tilted drum granulator. The drum rotates at a speed of 15-25 rpm. Inside the drum, the materials are subjected to the combined forces of centrifugal force, friction, and gravity:
Small particles first absorb moisture to form "nuclei."
As the drum rotates, the nuclei continuously collide with and absorb surrounding fine powder, gradually growing into spherical particles with a diameter of 2-8 mm.
Unqualified large lumps of material are broken down by the scrapers inside the drum and re-enter the granulation process.
3. Post-processing stage: The formed granules first enter the dryer to reduce the moisture content to 10%-15%; then they are cooled to room temperature in a cooler to prevent the granules from clumping; finally, qualified granules are screened out through a grading screen, and unqualified granules are returned to the pulverization system for re-granulation. Qualified granules are sealed and stored in a packaging machine.
Advantages of the rotary drum granulation line:
1. Wide adaptability of raw materials:
It can process a variety of organic fertilizer raw materials, including livestock and poultry manure, straw, humic acid, and pharmaceutical residue, eliminating the need for strict control of raw material composition.
2. Stable pellet quality:
The pellets are nearly spherical, strong, and resistant to breakage, making them easy to transport and apply for fertilizer.
3. High production capacity flexibility:
By adjusting the drum speed, feed rate, and moisture content, production capacity can be flexibly adjusted, and large-scale lines can achieve 24-hour continuous production.
4. Low maintenance costs:
The rotary drum granulator has no complex internal transmission components, and the liner is replaceable, allowing for a long maintenance cycle.
Scale Type | Small production line | Medium production line | Large production line |
Daily processing capacity | 2-8 tons | 10-40 tons | 40-60 tons |
degree of automation | There are many manual operations, such as manual loading and manual adjustment of equipment operating parameters, and few automated control links. | Some links are automated, such as automatically adjusting the temperature, humidity, and feed volume of materials through sensors and control systems, reducing manual intervention | Highly automated, using PLC control system to automatically adjust equipment operating parameters according to production conditions |
Floor space | 200-350㎡ | 500-800㎡ | 1000-2000㎡ |
What raw materials can a drum granulation line process? Are there any specific requirements for the raw material properties?
It can process organic raw materials (fermented livestock and poultry manure, straw powder, mushroom residue), inorganic raw materials (urea, diammonium phosphate, potassium chloride, slag), and mixed raw materials (organic-inorganic compound fertilizer raw materials). The raw materials must have uniform particle size and a certain degree of viscosity. Avoid non-sticky materials such as pure sand or pure fiber, as granulation will be difficult.
What are the wearing parts of a drum granulator?
Wearing parts include the drum liner, lifter plate, drive bearings, and seals. Under normal use, the service life of the liner is 8-12 months (for organic materials) or 5-8 months (for inorganic hard materials), the lifter plate is 6-10 months, and the bearings are 1-2 years.
How many workers are needed to operate a drum granulation line? Are specialized technicians required?
A production line with an hourly output of 5-15 tons requires 6-8 people; a production line with an hourly output of 15-30 tons requires 10-12 people. Adding an automated control system can reduce the number of people by 2-3. One professional technician is required, and ordinary workers can begin work after a week of factory training. No professional qualifications are required.
What raw materials are suitable for a rotary drum granulation line? Can it produce organic fertilizer and compound fertilizer?
Rotary drum granulation lines are highly adaptable to various raw materials and are primarily suitable for organic fertilizer, compound fertilizer, biofertilizer, and inorganic fertilizer. When processing organic fertilizer, pretreatment equipment is required to ensure the raw material moisture content is controlled at 30%-45%. When processing compound fertilizer, the binder ratio can be adjusted to accommodate different ratios of nitrogen, phosphorus, and potassium raw materials.
After the production line is shut down, how can the inner wall of the rotary drum be cleaned to prevent residual material agglomeration?
After shutting down, follow the "three-step cleaning method":
Initial Cleaning: Immediately after shutting down, open the drum inspection door and use a scraper to remove any remaining wet material from the inner wall. The removed wet material can be temporarily stored and returned to production the next time the machine is restarted.
Warm Water Rinse: If the remaining material is viscous, use a high-pressure water jet with 40-50°C warm water to rinse the inner wall, focusing on the gaps between the scrapers and welds.
Drying and Rust Prevention: After rinsing, start the drum and idle for 10-15 minutes to use the residual heat to dry the inner wall. Finally, apply a thin layer of engine oil evenly to the inner wall to prevent rust.
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