Falling Film Evaporator

Vertical shell-and-tube heat exchanger, with a laterally or concentrically arranged centrifugal separator.

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Vertical shell-and-tube heat exchanger, with a laterally or concentrically arranged centrifugal separator.

Falling Film Evaporator

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Operation

The liquid to be concentrated is supplied to the top of the heating tubes and distributed in such a way as to flow down the inside of the tube walls as a thin film. The liquid film starts to boil due to the external heating of the heating tubes and is partially evaporated as a result. The downward flow, caused initially by gravity, is enhanced by the parallel, downward flow of the vapor formed.

Residual film liquid and vapor is separated in the lower part of the calandria and in the downstream centrifugal droplet separator. It is essential that the entire film heating surface, especially in the lower regions, be evenly and sufficiently wetted with liquid. Where this is not the case, dry spots will result that will lead to incrustation and the build-up of deposits.

For complete wetting it is important that a suitable distribution system is selected for the head of the falling film evaporator. Wetting rates are increased by using longer heating tubes, dividing the falling film evaporator into several compartments or by recirculating the product.

Particular features

Best product quality – due to gentle evaporation, mostly under vacuum, and extremely short residence times in the falling film evaporator.
High energy efficiency – due to multiple-effect arrangement or heating by thermal or mechanical vapor recompressor, based upon the lowest theoretical temperature difference.
Simple process control and automation – due to their small liquid content falling film evaporators react quickly to changes in energy supply, vacuum, feed quantities, concentrations, etc. This is an important prerequisite for a uniform final concentrate.
Flexible operation – quick start-up and easy switchover from operation to cleaning, uncomplicated changes of product.

Fields of application

Capacity ranges of up to 150 t/hr, relatively small floor space requirement.
Particularly suited for temperature-sensitive products.
For liquids which contain small quantities of solids and have a low to moderate tendency to form incrustations.

Produtos relacionados

Direct Steam Sterilization

Concentrated food products need to be sterilized before they can be stored, packed or dried.

Evaporador de Circulação Natural

Trocador de calor vertical tipo concha e tubo com tubo de pouco comprimento, com separador lateral disposto no topo.

Evaporador de placas

Uma configuração de placa e estrutura emprega placas especiais, com produto e meio de aquecimento em canais alternados. As placas são seladas pelas juntas localizadas dentro de vãos especialmente projetados que não requerem adesivos. Estas juntas podem ser inseridas e removidas sem ferramentas especiais.

Forced Circulation Evaporator

Horizontal or vertical shell-and-tube heat exchanger or plate heat exchanger as the calandria, with flash vessel/separator arranged above the calandria, circulation pump.