A significant feature of the counterflow cooler is its high and uniform cooling efficiency. Cold air enters from the bottom of the cooler and flows upward, while hot pellets enter from the top and move downward, creating countercurrent heat exchange. This pattern ensures that the cold air first contacts the bottom layers of pellets that are nearly at ambient temperature, gradually warms up, and finally contacts the hottest incoming pellets. This avoids rapid surface contraction and cracking caused by direct cold air blasting, significantly reducing the pellet powdering rate. It is energy-efficient and provides stable cooling performance.
Specifications are divided by cooling area or hourly cooling capacity, such as the SKLN series. Cooling capacity ranges from 1 ton/hour to over 10 tons/hour. The supporting fan air volume ranges from 5000 to 20,000 cubic meters per hour. The pellet temperature after cooling can be reduced to within 3-5°C of the ambient temperature. Moisture is reduced by approximately 1.5%-3%. The equipment is equipped with an automatic discharge mechanism (e.g., swing or rotary type), controlled by a level sensor for continuous operation.
Specifically used after the ring die pellet mill or extruder to cool and dehumidify hot and moist pellets exiting the die at temperatures of 75-90°C and moisture content of 15%-17%. It is an indispensable process step in pellet feed production. Cooled pellets have increased hardness and reduced moisture, facilitating subsequent processes like crumbling, screening, and packaging, and effectively preventing mold and spoilage during storage.
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