Sea water desalination - by condensation of Oe-Laval nozzle injected steam in cylinder inside outer cylinder at negative pressure

摘要

Seawater is desalinated in two horizontal cylinders, the inner cylinder acting as a condensation space and the space between inner and outer cylinder filled partly with preheated seawater and kept at a negative pressure. A separate boiler for preheated seawater supplies the working steam for an injector type of jet pump which is designed as a De Laval nozzle and injects the steam for condensation into the inner cylinder. System reduces the number of moving parts to a minimum so that energy is saved and maintenance is reduced. Solar heat converters in suitable regions reduce the costs still further.