Raheja Ecotech Engineers

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Agitated Thin Film Dryer

An Agitated Thin Film Dryer (ATFD) is a cylindrical jacketed vessel. Product or Feed is pumped to the top of vertical type ATFD and is evenly distributed on the inner walls of the cylindrical shell with the help of a distribution plate. The steam is circulated inside the jacket for heating the feed. The feed begins to fall slowly on inner walls of the shell forming a thin layer and is agitated with the help of blades attached to a Rotor run with a motor. As the agitated feed comes down, evaporation rate becomes very high and eventually precipitation of the feed occurs when it comes out from the bottom inlet. The vapors are condensed in a condenser.
 
Advantages of Agitated Thin Film Dryers:
 
High heat transfer rates and suppressed fouling
Excellent performance for highly viscous fluid drying
Highly recommended for heat sensitive products
Versatile, can be used in almost any situation
Ideally suited for concentration, evaporation, distillation, de-odorizing, degassing, reaction of viscous, heat sensitive or fouling products
Short residence time of feed at cross sections of shell
Required evaporation is achieved in a single pass, avoiding products re-circulation
Low product holdup, ideal for hazardous applications
Rotor rpm can be set according to drying application and feed rate
Efficient even in Continuous operation applications
 
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Applications:
 
Pharmaceuticals- Drying of Effluent concentrate, Vacuum distillation, Solvent extraction
Food and Beverages-Drying of Effluent concentrate, Concentration of Juices, Dairy products, Glucose, Fructose, Lecithin, Cocoa and Syrups
Plastics

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