Patent ID: 7666281
Filing Date: 2010-02-23
Classification: B01D,C02F,Y10S

Abstract:
1. A method for operating a multi-effect falling-film evaporation plant for the production of purified water, said method comprising the steps of: a) supplying a feed water to a feed water inlet of a first falling-film evaporation effect in a multi-effect falling-film evaporation plant; b) evaporating the feed water in the first falling-film evaporation effect to form a steam and a residual water; c) circulating the residual water to a subsequent falling-film evaporation effect as a feed water; d) circulating the steam to the subsequent falling-film evaporation effect to heat the feed water in the subsequent falling-film evaporation effect thereby forming an additional steam and an additional residual water; e) condensing a portion of the steam circulated to the subsequent falling-film evaporation effect to form a purified water; f) repeating steps c)-e) for each subsequent falling-film evaporation effect; g) forming a combined purified water by combining the steams produced in a second falling-film evaporation effect onward to said final falling-film evaporation effect; and h) circulating the combined purified water to the feed water inlet of the first falling-film evaporation effect.