Simultaneous Removal of NO(x) and SO(2) by MgO Combined with O(3) Oxidation: The Influencing Factors and O(3) Consumption Distributions

[Image: see text] Simultaneous removal of NO(x) and SO(2) by MgO combined with O(3) oxidation was studied. The effects of the O(3)/NO molar ratio, oxidation temperature, and oxidation residence time on N(2)O(5) decomposition and O(3) consumption distributions were systematically illustrated, which is of great significance for improving NO(x) removal efficiency and reducing O(3) consumption in practical application. When the O(3)/NO molar ratio was greater than 1.0, the highest N(2)O(5) yield was achieved at 90 °C. The NO(x) removal efficiency reached 96.5% at an O(3)/NO molar ratio of 1.8. The oxidation temperature increased from 90 to 130 °C, resulting in the decrease of N(2)O(5) yield, the improvement of O(3)-ICC (O(3) invalid cycle consumption) caused by N(2)O(5) decomposition, and the decrease of NO(x) removal efficiency from 96.5 to 76%. Besides, the effects of pH, SO(2) concentration, and MgSO(3) addition on NO(x) removal efficiency were also investigated. The results showed that the removal efficiency of NO(x) decreased with the increase of SO(2) concentration, while MgSO(3) addition into MgO slurry could promote the absorption of NO(2) due to the reaction between NO(2) and SO(3)(2–).