Apparatus for desulfurization of flue gas

Abstract

A single-vessel apparatus for desulfurization of flue-gas containing gaseous sulfurous acid, in which the flue gas is contacted with an absorption liquid to thereby have the sulfurous acid content in the flue gas absorbed by said absorption liquid and, at the same time, oxidized by an oxygen-containing gas and further fixed, comprising: a gas dispersing plate member; a weir member; said gas dispersing plate member and said weir member forming in the single vessel first and second zones, the first one being a zone in which the flue gas is contacted with and absorbed by the absorption liquid, the second one being a reservoir of the absorption liquid; a flue gas introduction portion for feeding flue gas from below said gas-dispersing plate member to said first zone; a pipe through which to feed a sulfurous acid gas-fixing agent into the vessel; a pipe for discharging the absorption liquid; a treated gas-discharging outlet; a liquid-raising pipe disposed between a lower portion of said second zone and the flue gas dispersing plate; a pipe for introducing an oxygen-containing gas into the vessel, having a gas outlet below said liquid-raising pipe; and a liquid-dropping zone formed by a weir extending from above said gas-dispersing plate downwardly into the liquid in said second zone. In the apparatus, sulfurous acid gas is simultaneously subjected to both absorption and oxidation in said first zone.