Rotary Drying is Fast and Effective
POWDER & BULK SOLIDS
Uzelac Industries | Aug 07, 2020
Rotary Drying is a fast and effective method of drying that requires a relatively small space for large volumes. Here is a brief description of how rotary drying works:
Wet product is brought into direct contact with a hot air stream that is generated from any number of fuel sources. The wet product and hot air are drawn into a rotating dryer drum. The hot air stream dries and conveys the product in a concurrent process. The drum is equipped with internal longitudinal lifting flights that repeatedly drops the product into the axial air stream. As the product dries inside the drum it advances towards the collection system for the dried product.
The desired outlet moisture of the product is obtained by controlling the drum outlet air temperature, modulating the fuel control system as required. The heat source is modulated on the infeed side of the dryer. As the amount of product and moisture in the drum increase, the inlet temperature increases accordingly to satisfy the heat needed to dry the product effectively.
At the discharge end of the drum, the dried product is conveyed into cyclones where the product is separated from the airstream and discharged.
After the cyclones, the airstream is ducted to an induced draft fan. The fan creates a suction on the system that has two functions: to pull the heat from the burner through the drum and to advance the product in the rotary drum. duct dries inside the drum it advances towards the collection system for the dried product.