evaporators

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. Either steam or hot oil is passed through the jacket of the shell thereby heating the internal surface of the shell to required tem perature. The liquid feed is introduced at the top and the dry product is discharged at the bottom.

Forced Circulation Evaporators are specially designed for liquids that tend to scale, foul, highly viscous and crystallize depending upon the final concentration of the product. Feed is re-circulated in the shell and tube heat exchanger by pumping, heated under pressure to prevent boiling, and then flashed in the vapor liquid separator, where the absolute pressure is slightly less than in the heat exchanger, to obtain the required vaporization

Evaporators are used to increase the solid content in the liquids containing low solids, by evaporationg water or solvent from the liquid Evaporators basically consist of shell and tube heat exchanger columns called as calandrias. The product to be concentrated is passed through the tubes and the heating media, usually steam, is passed through the shell. The calandria tube side is under vacuum causing the liquid boiling at lower temperature, Thus making the operation economical and safe for heat sensitive products. Following are the types of evaporators depending upon the feed circulation configuration.