Wet limestone scrubbing is the most common flue gas desulfurization process for control of sulfur dioxide emissions from the combustion of fossil fuels

and forced oxidation which belongs to gas-liquid transfer process is a key path of the reaction.In the present work

the two-film theory was used to analyze the sulfite forced oxidation reaction with an image boundary recognition technique and the oxidation rate was experimentally studied by contacting pure oxygen with a sodium sulfite solution.There was a critical sulfite concentration 0.328 mol8226;L-1 without catalyst or at a steady catalyst concentration.When the Co2+ catalyst concentration was kept unchanged

the sulfite oxidation reaction rate was controlled by dual film and the reaction kinetics was first order with respect to sulfite while SO2-3 concentration was below 0.328 mol8226;L-1.The sulfite oxidation reaction rate was controlled by gas film only and the reaction was zeroth order with respect to sulfite while the SO2-3 concentration was over 0.328 mol8226;L-1.When SO2-3 concentration was kept unchanged

the sulfite oxidation reaction rate depended on gas-liquid mass transfer and the reaction kinetics was different in various stages with respect to Co2+ concentrations.