Experamental Study On Simultanous Removal Of SO₂ And NO_x From Flue Gas By Aqueous Solution

Experiments on simultaneous removal of SO2 and NOX from simulated flue gas are carried out in bench-scale bubbling reactor in this paper. Primary factors that effect removal efficiencies are determined by orthogonal experiments. And single factor experiments for them are carried out to determine optimal experimental conditions. Under the optimal experimental conditions, the desulfurization and denitrification efficiencies reach 100% and 96.84%, respectively. The products are analyzed by chemical analysis methods, and concentrations of NO₂^-, NO₃^-, SO₃^2-, SO₄^2-, Cl^- and ClO- in the product are determined separately. The experimental results indicate that there are only small quantities of sulfurous and nitrous in the products, which cannot cause new pollution. But the final pH of spent solution is lower than that discharge standard. Moreover, the mechanism of desulphurization and denitrification by aqueous sodium chlorite in bubbling reactor is discussed.