A falling film evaporator is essentially a shell & tube type of heat-exchanger used for processing liquors, which are sensitive, have a high rate of specific heat transfer, particularly for non-crystalline solutions.
The liquid to be concentrated is fed at the top of heated tubes and distributed in a way that it flows down on the inside surface of the tubes as a thin film.
The liquid distributor at the top assures uniform liquid loading of all tubes. As the film gets heated, the vapours generated flow downwards through the tube bundle in co-current with the concentrate.
Falling Film Evaporator offer distinct operating advantages in the concentration of many materials, such as certain food products, fruit juices, pharmaceuticals and similar materials, which are particularly suited to evaporation in this type of equipment.