Abstract
The effect of feeding rate of NaClO2 solution, inlet SO2 and NO concentration, [NaClO2]/[SO2+NO] molar ratio (η), L/G ratio and, solution pH on the simultaneous removal of SOx/NOx has been investigated in a wetted-wall column. Both SOx and NOx removal efficiencies are enhanced with the increasing feeding rate of NaClO2 solution and attain a steady state. NOx removal efficiency increases with increasing SO2 concentration, but SOx removal remains unaffected with increasing NO concentration. In an acidic medium, DeSOx and DeNOx efficiency increased with increasing [NaClO2]/[SO2+NOx] molar ratio and attained a steady state. NOx removal starts only after the complete removal of SOx. The excess of NaClO2 does not enhance NOx removal efficiency. Solution pH does not affect the DeSOx and DeNOx efficiency. The maximum SOx and NOx removal efficiencies achieved at the typical operating conditions of commercialized FGD processes are about 100 and 67%, respectively.
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