| 摘要 |
<p>Sulfur dioxide is removed from flue gases using an aqueous solution of magnesium components in a wet scrubber (1), with oxidation of a portion of the aqueous discharge from the scrubber. Calcium sulfate (25) is added to the portion of aqueous discharge at the oxidizer (17) to form an oxidized aqueous effluent containing calcium sulfate solids and dissolved magnesium sulfate. The oxidized aqueous effluent is regenerated by addition of lime, in a regeneration tank (31), which precipitates calcium sulfate as gypsum, with gypsum (43) returned to the oxidizer as the calcium sulfate added thereto. Preferably, the aqueous discharge from the oxidizer (17) is divided, with a major portion passed to a separator (59) to remove gypsum, therefrom, while a minor portion is passed to the regeneration tank (31). Magnesium sulfate solution (63), after separation of gypsum (61) from the major portion may also be fed to the regeneration tank (31). <IMAGE></p> |
