Simultaneous desulfurization and denitrification of sintering flue gas via composite absorbent

Experiments on simultaneous absorption of SO 2 and NO X from sintering flue gas via a composite absorbent NaClO 2 /NaClO were carried out. The effects of various operating parameters such as NaClO 2 concentration ( m s ), NaClO concentration ( m p ), molar ratio of NaClO 2 /NaClO ( M ), solution temperature ( T R ), initial solution pH, gas flow ( V g ) and inlet concentration of SO 2 ( C S ) and NO ( C N ) on the removal efficiencies of SO 2 and NO were discussed. The optimal experimental conditions were determined to be initial solution pH   =   6, T R   =   55   °C and M   =   1.3 under which the average efficiencies of desulfurization and denitrification could reach 99.7% and 90.8%, respectively. Moreover, according to the analysis of reaction products, it was found that adding NaClO to NaClO 2 aqueous solution is favorable for the generation of ClO 2 and Cl 2 which have significant effect on desulfurization and denitrification. Finally, engineering experiments were performed and obtained good results demonstrating that this method is practicable and promising.