The counter-current cooler is built for the cooling stage that follows pelleting in a compound feed mill or a biomass pellet plant. Pellets leave the pellet mill at high temperature, and the cooler brings them down to a temperature slightly above room temperature in a short time. That keeps the whole production line running without a pause, and it makes the pellets easier to store, warehouse and transport.
Cooling also protects quality. Warm pellets still carry moisture, and moisture is what causes caking and mould in the silo. Once the pellets are cooled and their surface has set, they hold their shape through bagging, stacking and a long sea voyage.
The machine is powered by a motor. Material is fed through the upper inlet and drops into the storage bin. When the material reaches half the height of the bin, which normally takes about one hour, an alarm reminds the operator to check the level through the observation window. The motor switch is then turned on.
After the gate is opened the cooler works on its own, and the operator does not need to watch it all the time. Air is pulled in from the bottom and pushed upward, against the pellets moving down. The lower layer cools first, the hot air passes up through the material above it, and the pellets are cooled gradually from the bottom up.
Beneath the cooling chamber, a vibrating screen takes out broken pellets and fines. Finished pellets are discharged from the outlet, while the broken material falls through the mesh and is collected from a second outlet. It can then go back into the process instead of being thrown away.
Zhengzhou Weiwei Machinery has manufactured feed and biomass machinery since 1980 and holds ISO9001, CE, SGS and TUV certification. Coolers, pellet machines, hay cutters and complete pellet lines from Weiwei are exported to the Americas, Africa, Southeast Asia and South Asia, with after-sales service and spare parts support.
