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MEE Plant

A multiple effect evaporator is an apparatus that efficiently uses the heat from steam to evaporate water.

In a multiple effect evaporator, water is boiled in a sequence of vessels, each of which is at a lower pressure than the last. As the boiling point of the water decreases with pressure, the vapor produced in one vessel can be used to heat the next vessel. Only the first vessel requires a source of external heat. Evaporators with more than four to five effects are rarely practical (see Figure 13.4 for a schematic of a multiple effect evaporator).