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Types of Dryers

Aggregates are dried and heated in a dryer drum as they are tumbled through a hot air stream. The hot air is created by a burner and is pulled through the drum by a fan.

 

The direction of air flow relative to the direction of aggregate flow describes the two types of dryers-parallel-flow and counterflow.

 

In a parallel-flow drum, aggregates move in the same direction as the hot air. For a counterflow plant, the aggregates move in the opposite direction.

 

Parallel Flow

Parallel Flow

 

Counter Flow
Counter Flow