Abstract
NO was oxidized into NO 2 first by injecting ozone into flue gas stream, and then NO 2 was absorbed from flue gas simultaneously with SO 2 by pyrolusite slurry. Reaction mechanism and products during the absorption process were discussed in the followings. Effects of concentrations of injected ozone, inlet NO, pyrolusite and reaction temperature on NO x /SO 2 removal efficiency and Mn extraction rate were also investigated. The results showed that ozone could oxidize NO to NO 2 with selectivity and high efficiency, furthermore, MnO 2 in pyrolusite slurry could oxidize SO 2 and NO 2 into MnSO 4 and Mn(NO 3) 2 in liquid phase, respectively. Temperature and concentrations of injected ozone and inlet NO had little impact on both SO 2 removal efficiency and Mn extraction rate. Specifically, Mn extraction rate remained steady at around 85% when SO 2 removal efficiency dropped to 90%. NO x removal efficiency increased with the increasing of ozone concentration, inlet NO concentration and pyrolusite concentration, however, it remained stable when reaction temperature increased from 20 °C to 40 °C and decreased when the flue gas temperature exceeded 40 °C. NO x removal efficiency reached 82% when inlet NO at 750 ppm, injected ozone at 900 ppm, concentration of pyrolusite at 500 g/L and temperature at 25 °C.
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