The temperature of pellets after the pellet mill can reach 100 °C and they do not have sufficient strength qualities, so to achieve their consumer qualities, they must be cooled – for this purpose, counter flow coolers are used.
This type of equipment is characterized by a design where the cooled air is drawn in by a fan through the lower part of the cooler and passes through the pellet layer. The internal volume of the cooler ensures uniform air flow distribution through the granules layer, which prevents their deformation during the cooling process.
The cooler’s design prevents forming of wet spots or sticking to the walls.
The principle of a rotary valve cooler operation is based on air exhausting through a layer of product that has different depths. The new product is continuously fed through the inlet valve, while the discharge device with a rotary valve ensures smooth unloading of the cooled product into the sieving zone, and due to the fact that the granules move by gravity flow, the loads on them are minimal. The exhaust air is removed through the air ducts by an aspiration system.
The cooler is equipped with filling sensors and a fire protection system. The open and closed positions of the unloading device can be adjusted manually or remotely using a controller or PLC.