Purificn. of waste gases via row of scrubbing towers - where washing liq. flows in countercurrent to the gas for efficient removal of noxious impurities

摘要

Parent patent described the purificn. of waste gases by the absorption of noxion impurities in scrubbing towers. Improvement to is the use of =2 scrubbing towers, where liq., e.g. water, used in the last tower is fed into a preceding tower in which initial gas purificn. occurs. In the proceeding tower, i.e. the first scrubber, the washing liq. travels downwards through a vertical row of sieves (A) in which the holes have an area of 35-45 (pref. 40)%, of the total surface of the sieves. The sieve holes pref. have a pitch of min. 15 mm, the ratio pitch: hole width being 1.4-6:1. The purified gas contains max. 5 mg impurities per m3.