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Counterflow pellet cooler

Counterflow pellet cooler is used in pellet production line to lower the temperature of pellets, increase their hardness and reduce the water content. Counterflow cooler is an excellent choice for cooling pellets for its high energy efficiency, easy operation, good cooling effect and low cost.

The pellets coming out from the pellet machine have the temperature of 70℃~90℃, and the moisture of 17%-18%. They are soft and damp and can not be packed or stored immediately. So they need to go through the counterflow pellet cooler, where the temperature lower to 3℃~5℃ above the room temperature, and the moisture lower to under 12.5%. After cooling process, wood pellets become more convenient for storage and transportation.

counterflow cooler
counterflow cooler

Structure of a counterflow pellet cooler

  • Air-lock feeder. It can feed wood pellets evenly, and prevent air or moisture getting into the cooling chamber.
  • Outer drum. Serves to gather feed materials and hot air. Equipped with an observation door to facilitate maintenance.
  • Cooling tank, where the pellets are distributed evenly and get cooled by the airflow.
  • Drive engine. The conterflow pellet cooler is powered by a electric engine, discharge motor and shaker motor.
  • Discharge port, where the cooled pellets get expelled and the cold air gets in.

counterflow cooler
Specifications of the Conterflow Coller

Model Capacity (t/h) Feed motor power Discharge motor power (kw) Shaker motor power (kw) Fan model Cyclone model Size L*W*H (mm) Weight (kg)
SKLN11 1-2 0.75 0.75(slide)0.2*2(vibration) 0.2 4-72-4A/5.5Kw 800 2150*1325*3050(slide)2150*1325*3450(vibration) 800
SKLN14 2-5 0.75 1.5(slide) 0.2*2(vibration) 0.4 4-72-4.5A/7.5Kw 1200 2500*1650*3200(slide)2500*1650*3600(vibration) 1200
SKLN16 4-7 0.75 1.5(slide) 0.2*2(vibration)   4-72-5A/11Kw 1500 2100*2000*3130(slide)2100*2000*3600(vibration) 1500
SKLN19 5-10 1.1 1.5(slide) 0.2*2(vibration)   4-72-6C/18.5Kw 2000 2450*2370*3480(slide)2450*2370*3000(vibration) 2000
SKLN21 8-15 1.1 1.5(slide)   4-72-8C/22Kw 2500 2800*2300*4600(slide) 2500
SKLN24 8-15 1.1 1.5(slide)   4-72-8C/30Kw 3000 3100*2600*4600(slide) 3000

Features of counterflow pellet cooler

  • The counterflow pellet cooler adopts counter current as the cooling agent. It can avoid the shock cooling when cold air contact with the hot pellets and prevent the pellets from cracking.
  • The cooling tank is octagonal. There is no dead angels in the tank.
  • The discharge port adopts slide valve reciprocating design. It runs steadily with little residues or blocking.
  • Adopts air-closed feeder with large inlet air area. High cooling speed and good cooling effect. Low power consumption, easy operation and cleaning.
  • The deflector or centrifugal distributor can distribute the pellets evenly in the cooling tank, which improve the cooling speed and effect.
  • The air speed in a counterflow pellet cooler is between 0.8 and 1.5m/s. If the cooling time is not enough, the pellets inside will be still moist and sticky. If the cooling time is too long, the pellets will become too dry and easy to crack.
counterflow pellet cooler
counterflow pellet cooler
counterflow pellet cooler
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How does a counterflow pellet cooler work?

The pellets are fed through the airlock feeder into the cooling tank. Then they are distributed by the deflectors or centrifugal distributors. The adjustable level sensor serves to maintain the bed depth of the materials.

The cold air go though the pellets vertically and touch the cold pellets. The warm air moves oppositely to the pellets dropped direction and contact and touch the hot pellets. This gradual cooling process avoids cold air’s direct contact with hot pellets and prevent pellets cracking.

The cooled pellets are discharged through the discharge grate. The sensors and PLC system ensures the discharge process is uniform and continuous.

counter flow cooler working principle

How to operate a counterflow pellet cooler?

  • Start the air-lock device and the draught fan before the cooler start to work.
  • Adjust the level sensor according to the yield requirement.
  • When the cooler stops, expel the materials through the discharge port with the hand switch.
  • During the cooler working, don’t open the observation door.

How to maintain a conterflow pellet cooler?

  • Check the fasteners regularly to see if they are loose or falling off.
  • Clean the guide plates regularly ensure the air currents run smoothly.
  • Lubricate the bearings and electic motor regularly.
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