Simultaneous Removal of NO _x and SO₂ by MgO Combined with O₃ Oxidation: The Influencing Factors and O₃ Consumption Distributions.

ABSTRACT: Simultaneous removal of NO _x and SO₂ by MgO combined with O₃ oxidation was studied. The effects of the O₃/NO molar ratio, oxidation temperature, and oxidation residence time on N₂O₅ decomposition and O₃ consumption distributions were systematically illustrated, which is of great significance for improving NO _x removal efficiency and reducing O₃ consumption in practical application. When the O₃/NO molar ratio was greater than 1.0, the highest N₂O₅ yield was achieved at 90 °C. The NO _x removal efficiency reached 96.5% at an O₃/NO molar ratio of 1.8. The oxidation temperature increased from 90 to 130 °C, resulting in the decrease of N₂O₅ yield, the improvement of O₃-ICC (O₃ invalid cycle consumption) caused by N₂O₅ decomposition, and the decrease of NO _x removal efficiency from 96.5 to 76%. Besides, the effects of pH, SO₂ concentration, and MgSO₃ addition on NO _x removal efficiency were also investigated. The results showed that the removal efficiency of NO _x decreased with the increase of SO₂ concentration, while MgSO₃ addition into MgO slurry could promote the absorption of NO₂ due to the reaction between NO₂ and SO₃ ^2-.

SUBMITTER: Zou Y 

PROVIDER: S-EPMC6921272 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature