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A falling film Evaporator is a device used in industries to evaporate temperature-sensitive substances and obtain concentrates of those substances under controlled conditions. They find application in several industries such as dairy, paper and chemical. Falling film evaporators can also be used if the pharmaceutical and food fields.
The heat-sensitive liquid to be processed flows downwards in a thin film along the walls of the heating tubes, which is why it is called as a falling film evaporator . The liquid substance is heated to boiling temperatures if necessary, before being allowed to enter the head of the evaporator . Once it enters the head, it flows downward through the inside surface of the heating tubes.
Steam is applied to the outside surface of the tubes. The liquid evaporates without coming into direct contact with the steam. In the next phase, the concentrated liquid and the steam vapor enter a separator. The liquid is collected and released through a pump.
A falling film evaporator is used to concentrate substances that have a tendency to leave behind residues due to condensation. They are very carefully designed to allow the liquid to flow evenly down the surfaces of the tubes and require proper wetting of the heating surfaces for the process to go smoothly. If the surfaces aren’t properly moistened, then incrustations and dry patches could occur, which would hinder the whole process.