Grate-Kiln Iron Ore Pelletizing System

Brand: Valmet

Grate-Kiln Iron Ore Pelletizing System

Brand: Valmet
The forced air annular cooler is used to cool the fully indurated pellets. This recoups the heat and allows for handling of the pellets to storage and shipping. 

The annular cooler is functionally the same as the traveling grate except for its annular configuration. 

Hot pellets discharging from the rotary kiln are discharged directly to the annular cooler. Ambient air is forced upwards through the conveying elements (pallets) and the bed. 

Thus machine parts are not exposed to high temperatures. The pellets are leveled in the annular cooler to a uniform bed depth and conveyed over the primary and final cooling zones. 

In each cooling zone, sufficient cooling air is provided to produce the mass of air at temperature required by the rotary kiln and traveling grate. 

Sufficient total air is supplied to cool the pellets to the temperature that the product handling system will tolerate. 

The annular cooler is divided into three windbox zones under the pellet bed with cooling air supplied to each zone by an independent fan. 

The area above the bed of pellets is also divided into four zones.

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