Our falling film evaporator is the simplest and most commonly used type of film evaporator. The liquid flows as a thin film on the inside of heated vertical tubes, driven by gravity. The resulting vapor normally flows cocurrently with the liquid, in the centre of the tubes.
A full evaporation stage consists of the falling film evaporator itself including the feed distribution system, a separator to separate the vapors from the residual liquid, and a condenser. Additionally, when high evaporation ratios are required, a part of the concentrated liquid is recycled back to the inlet of the evaporator, in order to ensure that sufficient wetting of the tubes is maintained