As we all know, the final pellets produced by feed pellet mill are soft and moist in high temperature, so they can not be transported and stored immediately and require to be cooled first. Therefore the pellets need to be cooled to remove moisture and heat generated in the conditioning and pelleting. The preferred choice for cooling is counterflow feed pellet cooler which has been the first choice in feed pelletizing plant.

pellet cooling machine

Pellet Cooling Machine Characteristics
1. Cooling tank adopts octagon design, no dead angles.
2. Large inlet air area, outstanding cooling effect.
3. Discharging device adopts slide valve reciprocating type.
4. Lower power consumption, easy operation and cleaning, high production efficiency.

How the  Feed Pellet Cooler Works
• The cooling process of the pellet product begins following its entry through the airlock feeder system (1).
• The product is then distributed with the standard distributor deflectors or optional centrifugal distributor (2).
• Cool air is drawn up from the bottom grate system (3), cooling the product and in the process, eliminating the warm air through the discharge duct (4).
• Adjustable level sensors are standard and maintain product bed depth (5).
• The cooled product is then discharged through the discharge grate. Sensors and PLC controlled discharge system provides near continuous product discharge (6) through the discharge hopper.

counterflow-pellet-cooler-working-principle feed pellet cooler

What Should be Noticed in the Cooling Process?
1. Cooling can directly affect the quality of final feed pellets, so it should be a gradual process. If the pellets are cooled quickly, cracks in the outer layers are formed, which in turn can lead to higher abrasion. Moreover, with short cooling period, the inner part of pellets is still warm and pellets are still moist and sticky. And cooling very slowly will make pellets become too dry, which also results in cracks.
2. It should be noticed that small pellets emit heat and moisture more quickly than large pellets. Even distribution of pellets in the cooler also enhances the cooling process.
3. Generally speaking, air speed in counter flow cooler should stay between 0.8 and 1.5 m/s.

Parameters of Counterflow Pellet Cooler

Model
SKLN1.5
SKLN2.5
SKLN4
SKLN6
SKLN8
Volume (m3)
1.5
2.5
4
6
8
Capacity (t/h)
3
5
10
15
20
Cooling time
no less than 6-10min
End temperature
no more than 3-5℃ of the room temperature
Power (kw)
0.75
0.75
1.5
1.5
1.5
Airlock Power (kw)
0.37
0.55
0.55
0.55
0.55