method and device for the desalination of seawater with a plate heat exchanger

摘要

The invention embodies a modified thermal multiple distillation process using a special plate-type heat exchanger. The plates are configured vertically. The heat exchanger is divided up into a number of zones, within each of which the same pressure is maintained. The pressure at the condensation side of each zone is equal to the pressure at the outlet on the evaporation side of the adjacent element operating at a higher temperature. The temperature differences between the zones correspond to the hydrostatic pressure difference in the head of water (15, 20) in the pressure-reduction plates placed between the zones. The good heat-flow between the condensing and evaporating liquid in the heat exchanger facilitates the multiple use of the heat applied to the high-temperature side from outside.