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Multi Effect Evaporators

Multi-Effect Evaporation is an important procedure adopted to economize the consumption of energy.

Multi Effect Evaporators are the equipment in which steam from an outside source is condensed in the heating element of first effect. The boiling temperature at which the first effect operates is high enough so that the evaporated water can serve as the heating medium for second effect. The vapors so formed are then sent to a condenser if it is a double effect evaporator.

The feed for the multi-effect type evaporator is generally transferred from one effect to another. This leads to the ultimate product concentration to reach only in the one effect of evaporator.
Multi Effect Evaporators


There are two feed operations - backward feed and forward feed operations. A brief explanation of these operations:

Multi Effect EvaporatorsMulti Effect Evaporators

In the backward operation, the raw feed enters the last (coldest) effect and the discharge from this effect becomes a feed for the next to last effect. This technique of evaporations is advantageous, in case the feed is cold, as much less liquid must be heated to the higher temperature existing in the early effects. The procedure is also used if the product is viscous and high temperatures are required to keep the viscosity low enough to produce good heat transfer coefficients.
Multi Effect EvaporatorsMulti Effect Evaporators
In the case of a forward feet operation, the raw feed is introduced in the first effect and is passed from effect to effect parallel to steam flow. The product is withdrawn from the last effect. This procedure is highly advantageous if the feed is hot. The method is also used if the concentrated product may be damaged or may deposit scale at high temperature.




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