What equipment is included in a bio-organic fertilizer granule production line?

A bio-organic fertilizer granule production line is key equipment for realizing the resource utilization of agricultural waste and promoting the development of green agriculture. Its core equipment works in an orderly manner according to the production process, covering four major stages: pretreatment, granulation, drying and cooling, and finished product processing. This ensures that raw materials are transformed into high-quality fertilizer with uniform granules and stable nutrients.

The pretreatment equipment is the foundation of the production line, mainly including a mixer and a crusher. The mixer evenly mixes raw materials such as livestock and poultry manure, straw, and mushroom residue with inoculants, adjusting the carbon-nitrogen ratio and moisture content to lay the foundation for fermentation and maturation. The horizontal twin-shaft mixer, with its high-efficiency mixing capacity, can achieve a mixing uniformity of over 90%. The crusher refines the agglomerated materials after fermentation to a suitable particle size, removing impurities and ensuring the success of subsequent granulation.

The fermentation turning stage is crucial for the nutrient conversion of bio-organic fertilizer, and the core equipment is the compost turning machine. After the pretreated mixed raw materials are fed into the fermentation tank, the turning machine mechanically turns the materials, allowing them to fully contact with air, regulating the fermentation temperature, promoting the reproduction of beneficial microorganisms, and accelerating the maturation of organic matter. Commonly used trough-type compost turners can turn the material to a depth of 1.5-2 meters, with a processing capacity of 50-200 cubic meters per hour. They effectively control the moisture content and temperature during fermentation, preventing anaerobic fermentation and off-odors, and ensuring the matured material is free of pests, diseases, and harmful substances, providing high-quality raw materials for subsequent granulation.

Pelletizing equipment is the core of the production line. Common types include rotary drum granulators, disc granulators, and new type organic fertilizer granulators. Drum granulators use wet granulation, spraying appropriate amounts of water and binders to form initial granules as the drum rotates. Disc granulators perform secondary shaping, making the granules smoother and increasing the pelleting rate to over 95%. New type organic fertilizer granulators are suitable for processing high-fiber raw materials.

Drying and cooling equipment is used to stabilize granule quality. It typically employs a two-stage drying process: the first dryer controls the temperature at 140-150℃ to initially remove moisture, and the second dryer dries at a lower temperature of 120-130℃ to prevent nutrient loss. The cooling unit rapidly cools the dried granules to room temperature through hot and cold air convection, preventing clumping and increasing granule hardness. A dust removal chamber is also included to reduce dust pollution and meet environmental protection requirements.

The finished product processing equipment includes a vibrating screen, a coating machine, and a packaging machine. The vibrating screen filters out qualified granules, while unqualified granules are returned for reprocessing. The coating machine uses powder or liquid coating to prevent granule clumping and prolong fertilizer effectiveness. The automatic quantitative packaging machine precisely measures and packages the finished product into standard sizes, achieving automated completion.

These devices work together to achieve automated and standardized production of bio-organic fertilizer from raw materials to finished product, improving production efficiency while preserving fertilizer nutrients, providing strong support for the development of green agriculture.

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