Water desalination method

PCT No. PCT/SU80/00069 Sec. 371 Date May 17, 1981 Sec. 102(e) Date May 8, 1981 PCT Filed May 5, 1980 PCT Pub. No. WO81/00707 PCT Pub. Date Mar. 19, 1981.A method of desalinating water resides in evaporating water from an aqueous salt solution upon contact of the latter with air, the water vapor being subsequently retrieved by condensing. The evaporation of water from the aqueous salt solution through contact thereof with the air is conducted by using two air flows, that is, primary and secondary flows. The primary air flow is supplied to a cooling zone, while the secondary air flow and the aqueous salt solution are delivered to an evaporation zone wherein the secondary flow is moistened by the water evaporating from the aqueous salt solution by virture of the psychrometric temperature difference until the moisture content in the secondary air flow is increased, as compared with the initial moisture content therein, by from 3.5 to 116 g/kg. During the course of absorbing the moisture, the secondary air flow acts to cool the primary air flow passing through the cooling zone. The secondary air flow is obtained by withdrawing between 20 and 90 volume percent from the primary air flow after it has passed through the cooling zone. Condensation of the water vapor is effected by conveying the secondary air flow which has passed through the evaporation zone and the remaining 80 to 10 volume percent of the primary air flow which has passed through the cooling zone to a condensing zone.