Tubular Falling Film Evaporator

FFE

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