Agitated Thin Film Dryers
Agitated thin film dryers are used to dry liquid solutions or slurries into flakes or powder. Agitated thin film dryer consists of a jacketed vertical shell having an agitator shaft mounted with multiple blades on it. The clearance between the shell and blades are very low. Either steam or hot oil is passed through the jacket of the shell thereby heating the internal surface of the shell to required temperature. The liquid feed is introduced at the top and spread across the shell internal by the rotating distributor. The agitator blades while rotating spread the liquid on the heated shell surface causing the evaporation of the solvent or water and the dry product is discharged at the bottom. If the feed contains solvent the dryer is operated under vacuum and the vaporised solvent is passed through a condenser to recover the solvent.