Pellets from dry pelleters may exit at up to 88°C and 17-18% moisture. The temperature must be quickly reduced to ambient or less and the moisture level to 10-12% or less for proper storage and handling. Pellets must therefore be cooled and dried. Moist pellets, if they are going to be converted to dry pellets, also need drying although their temperature is not normally much elevated during manufacture.
Pellet Cooler workshop:
Pellet mill cooler
Coolers/dryers are of two basic types, horizontal and vertical.
In the horizontal type of cooler/dryer (Figure 22) the pellets are conveyed on a perforated steel mesh or moving belt through which a cooling air stream is passed.
In the vertical type of dryer, pellets usually fall by gravity into a chamber through which air is sucked by a fan.
