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Chemical Reaction Steps in FGDProcess• SO 2 absorption in absorber• Neutralization of the absorber SO 2 to keep theSO 2 vapor pressure low so that more SO 2 canbe absorbed• Dissolution of the limestone or lime reagent toprovide alkalinity for neutralization andcalcium ion for precipitation• Oxidation of absorbed SO 2 to form sulfate(SO 4 )• Precipitation of calcium and sulfate or sulfiteto form byproduct
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