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Falling film evaporation is the material liquid from falling film evaporator heating room on the tube box to join, through the liquid distribution and film-forming device, uniform distribution to each heat exchanger tube, in gravity and vacuum induced and air flow, into a uniform film flow from top to bottom. During the flowing process, it is heated and vaporized by the shell process heating medium, and the steam generated enters the separation chamber of the evaporator together with the liquid phase, and the steam and liquid are fully separated, and the steam enters the condenser to condense (single-effect operation) or enters the next-effect evaporator as heating medium, thus realizing multi-effect operation, and the liquid phase is discharged from the separation chamber.


The process flow has four forms: downstream (parallel flow), counterflow, mixed flow (staggered flow), and advection.
Downstream
The solution and steam flow in the same direction, both from the first effect to the last effect in sequence. The raw material is pumped into the first effect and automatically flows into the next effect depending on the pressure difference between the effects, and the finished solution is pumped out from the last effect (usually operated under negative pressure). As the pressure of the latter effect is low, the boiling point of the solution is also low, and the solution will flash some water when it enters the latter effect from the former effect, and the secondary steam produced is also more. Downstream process is generally suitable for handling heat-sensitive materials in the case of high concentration.
Counterflow
The raw material is sent from the end effect to the front effect by the pump in turn, and the finished liquid is discharged from the first effect, and the liquid and steam flow in the opposite direction. Generally suitable for processing the solution whose viscosity changes with temperature and concentration, not easy Mixed flow
It is a combination of the flow with and against the flow, and has the advantages of the flow with and against the flow to avoid its disadvantages, but the operation is complex and requires a high degree of self-control.
Flat flow
Each effect is charged with the finished liquid, each effect has crystallization precipitation, can be separated in time crystallization, generally used for the evaporation of saturated solutions.

Features of falling film evaporation system

1) The material liquid of the falling film evaporator is added from the top of the evaporator, descends into a film along the wall of the tube under the action of gravity, and evaporates and thickens in the process, and gets the concentrated liquid at its bottom. The falling film evaporator can evaporate higher concentration and larger viscosity materials.
2) As the solution flows in a single process evaporator in the form of membrane, the heat transfer coefficient is high.
3) Short retention time, not easy to cause material deterioration, suitable for handling heat-sensitive materials.
4) The liquid retention is small, and the falling film evaporator can take fast operation according to the change of energy supply, vacuum, feed quantity, concentration, etc. Near constant,
5) Since the process fluid flows only under the action of gravity and is not driven by high temperature difference, low temperature difference evaporation can be used.
6) Falling film evaporator is suitable for evaporation and concentration of foaming materials, because the material liquid evaporates in the heating tube in the form of film, that is, the formation of vapor-liquid separation, at the same time in the bottom of the effect body, most of the material liquid will be pumped away, only a small part of the material liquid and all the secondary steam into the separator to strengthen the separation, the whole process of material liquid does not form too big impact, avoiding the formation of foam.

falling film evaporation of application


Falling film evaporator is widely used in medicine, food, chemical, light industry and other industries for evaporation and concentration of water or organic solvent solution, and can be widely used in the above industries for waste liquid treatment. Especially suitable for heat-sensitive materials, the equipment is operated continuously under vacuum and low temperature conditions, with high evaporation capacity, energy saving, low operating costs, and can ensure that the material does not change in the evaporation process.

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