| 摘要 |
<p>This invention relates to a process for the desulfurization of exhaust gas by bringing an exhaust gas containing oxides of sulfur into continuous gas-liquid contact with a treating solution comprising a desulfurizing agent in a desulfurization tower to thereby absorb said oxides in said solution, wherein calcined magnesium oxide is used as the desulfurizing agent and an external treatment system consisting of first and second reaction stages and a solid-liquid separation stage are provided outside the desulfurization tower. The first reaction stage comprises mixing a desulfurization liquor supplied from the desulfurization tower with a slurry supplied from the solid-liquid separation stage to effect a reaction therebetween, while the second reaction stage comprises mixing the reaction product of the first reaction stage with the particles of calcined magnesium oxide to effect a reaction therebetween. The solid-liquid separation stage comprises separating the reaction product of the second reaction stage into a solution free from solid matter and a slurry to be fed to the first reaction stage, and supplying said solution free from solid matter to the desulfurization tower for use as the treating solution therein. The reaction in the first reaction stage can be promoted by finally dividing at least part of the slurry to be fed to said stage.</p> |
