Distillation: apparatus – Apparatus – Systems
Patent
1984-03-06
1987-01-13
Bascomb, Wilbur
Distillation: apparatus
Apparatus
Systems
202174, 202177, 202197, 202236, 202266, 202269, 202270, 159 131, 159 18, 159 271, 159 286, 159DIG8, 159DIG22, 159DIG42, 165166, 203 11, 203 72, B01D 306, B01D 126, C02F 106
Patent
active
046362835
ABSTRACT:
In the distillation of fresh water from sea water, the sea water is passed ownwardly in a falling film evaporator through a multiplicity of vertical tube evaporator (VTE) stages and multiple stage flash (MSF) evaporators. After the sea water passes through the first VTE stage where it forms a liquid component and a steam component, the liquid component is distributed evenly into the next VTE stage while the steam component enters an adjoining MSF stage. Condensed fresh water flows downwardly from one MSF stage to the next and experiences flash evaporation. The sea water or brine component and the fresh water distillate flow downwardly through the VTE and MSF stages so that the brine component can be removed from the final VTE stage and the fresh water distillate from the final MSF stage. The steam used to evaporate the sea water flows initially through the first VTE stage and then in combination with the steam component of the sea water through the next MSF stage and then continues alternately through the remaining VTE and MSF stages. Inert gases produced during the stagewise evaporation are removed periodically by suction. In the lower or low pressure VTE stages, for each VTE stage the condensed fresh water distillate is flashed in a plurality of MSF stages. The sea water is preheated before it is introduced into the first VTE stage and the primary steam used for heating the sea water and the steam component of the sea water are passed through the preheater for heating the sea water. The preheater and the VTE stages of the falling film evaporator are formed of stamped heat exchanger parts.
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Bascomb Wilbur
D.V.T. Buro fur Anwendung Deutscher Verfahrenstechnik H. Morsy
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