![]() The internal pressure in the evaporator is 675 mm Hg absolute, and the vapor (V) and concentrated liquid (L) streams leaving the evaporator are at the same temperature as the evaporator contents (well mixed assumption). The concentrated liquid exits the evaporator with 40 weight percent solids. Vapor V Feed F Steam S Condensate s Concentrated liquid L An aqueous slurry at 20☌ and 1.01325 bar enters the evaporator with 5 weight percent solids. Heat required to vaporize the water is provided by steam that flows through a tube inside of the evaporator, with saturated steam fed to the evaporator and saturated liquid exiting the tube from the evaporator. Evaporation Energy Balance Evaporation is commonly used to concentrate a feed stream by evaporating water, resulting in an increase in the concentration of the solid dissolved in solution.
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