The Tubular Falling Film Evaporator FFE is the right solution to concentrate streams containing a small amount of suspended solids, low-medium viscous fluids and heat sensitive products.

It is particularly suited to energy saving multiple-effect (ME) evaporation, Thermal Vapor Recompression (TVR) or mechanical vapor recompression (MVR) arrangement due the very small operating temperature difference between heating medium and process side ("driving force").

In a multi-stage system, Falling Film Evaporators can be used in combination with Thin Film Evaporators/Dryers or with Forced Circulation Evaporators/Crystallizers.

FEATURES

• Very high heat transfer coefficient, especially for low viscous product under turbulent conditions

• Small mean temperature differences between heating medium and process side

• Short residence time in the heating tubes, mainly in one-trough operation, therefore also low liquid hold-up

• Negligible pressure drop in the heating tubes, therefore only in deep vacuum applications the pressure drop has to be considered

• Operation at low absolute pressure

• Sensitive to fouling from precipitating solids, nucleate boiling is to be avoided