Abstract: Experiments were conducted using a b雪森ubbling reactor to investigate計上 nitrogen oxide absorption in the船我 calcium sulfite slurry. The effe森北cts of CaSO₃ concentration, NO₂/NO mole ratio and O₂ concentrations on NO₂ and SO₂ absorption efficiencies were inve雪懂stigated. Five types of a現秒dditives, including MgSO₄, Na₂SO₄, FeSO₄, MgSO₄/Na₂SO₄ and FeSO₄/Na₂SO₄, had been evaluated 上志for enhancing NO₂ absorption in CaSO₃ slurry. Results showed that CaSO₃ concentration had signif家人icant impact on NO₂ and SO₂ absorption efficiencies, and the hi廠低ghest absorption efficiencie好這s of SO₂ and NO₂ could reach about 99.5 and 75.0 %, res輛跳pectively. Furthermore, the NO₂ absorption was closely作器 related to the NO₂/NO mole ratio, and the existence土很 of NO₂ in flue gas may promote費算 NO absorption. The presence o通和f O₂ in simulated flue ga遠那s was disadvantage for NO(x) removal飛中 because it can oxid議喝ize sulfite to sulfate. It was worth制雜 pointing out that FeSO₄/Na₂SO₄ was the best additive among those 紅但investigated additives, as the NO₂ removal efficiency was s關鄉ignificantly increased from 74.我場8 to 95.0 %. IC and in situ FTIR re那吃sults suggest that the main produ不玩cts were NO₃^- and NO₂^- in liquid phase and N₂O, N₂O₅ and HNO₃ in gas phase during the CaSO₃ absorption process.