Kamyr, Inc.

Carl E Elmore

Kyle D Infante

Evaporation of saline water in a desalinization process, or evaporation of other types of liquid such as black liquor from paper pulp processing, is accomplished utilizing a multiple effect evaporator. Each effect includes one or more (e.g. first and second) sets of horizontally elongated dimpled plate evaporator elements. Horizontally flowing heating fluid, such as steam, is introduced to the internal passage of at least the second set in all the effects, and a head of circulation liquid is provided to cause liquid being evaporated to flow downwardly from the head over the external surfaces of the sets of dimpled plates in a thin film. The vapor evaporated is drawn through a demistor and is used as the heating fluid for the next effect. Recirculating liquid that has not evaporated and liquid separated by the demisting process are recirculated to the head associated with each effect. Clean condensate--such as distilled water--is withdrawn from the last effect. The liquid to be evaporated may be preheated by passing it through the first sets of dimpled plates countercurrent to the flow of vapor. A vapor compressor may be used to raise the temperature of the vapor withdrawn from the last effect and return it to the heating fluid inlet of the first effect.

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Glens Falls, NY, United States of America

Carl E Elmore