| 摘要 |
<p>PURPOSE:To enhance purity of recovered gypsum by providing both a dust removal part due to gas-liquid contact and an absorption oxidation part performing adsorption and oxidation of SOx due to gas-liquid contact and providing a communicating line wherein circulating slurry for dust removal is fed to the absorption oxidation part from the dust removal part. CONSTITUTION:Exhaust gas 1 is introduced into a dust removal tower 3 through an inlet duct 2 and slurry fed from a circulation tank 4 for dust removal is sprayed and it is removed from dust, cooled and sent to an absorption tower 6 of an absorption oxidation part via a demister 5. Circulating slurry for absorption of a Ca absorbent is sprayed through nozzles 10 in the absorption tower 6 and SOx is absorbed and removed. The circulating slurry for absorption falls into a circulation tank 7 and a fine bubbles 29 are fed and CaSO3 is oxidized to produce gypsum. One part of the circulating slurry for dust removal is fed to the circulation tank 7 through a duct 31 and a metallic ion becoming a catalyst for oxidizing CaSO3 is fed.</p> |
