Studies on magnesium-based wet flue gas desulfurization process with oxidation inhibition of the byproduct

► A systematical study on a novel magnesium-based WFGD process with a spray scrubber. ► Na2S2O3 was found effectively to inhibit the oxidation of desulfurization byproduct. ► The desulfurization efficiency could reach a high level above 90%. ► A desulfurization process model was established by the double-film theory. ► The desulfurization process was found to be controlled by gas-film diffusion.