Abstract: Experiments were conducted using a bub話術bling reactor to investigate nitrogen白坐 oxide absorption in th呢道e calcium sulfite slurry. The effe服匠cts of CaSO₃ concentration, NO₂/NO mole ratio and O₂ concentrations on NO離也₂ and SO₂ absorption efficiencies w業慢ere investigated. Five 那他types of additives, inc和亮luding MgSO₄, Na₂SO₄, FeSO₄, MgSO₄/Na₂SO₄ and FeSO₄/Na₂SO₄, had been evaluated for enhancing N又腦O₂ absorption in CaSO₃ slurry. Results showed that C坐白aSO₃ concentration had sig又化nificant impact on NO₂ and SO₂ absorption efficiencies, 近海and the highest abso還湖rption efficiencies of S水劇O₂ and NO₂ could reach about 99.5 a地和nd 75.0 %, respectively. Furtherm海醫ore, the NO₂ absorption was closel從放y related to the NO₂/NO mole ratio, and the existence o鐘都f NO₂ in flue gas may promote NO absorption街件. The presence of O₂ in simulated flue gas站紅 was disadvantage for NO(x) removal be風聽cause it can oxidize sul街秒fite to sulfate. It was worth多術 pointing out that FeSO時中₄/Na₂SO₄ was the best additive among those 吃道investigated additives, as the NO船笑₂ removal efficiency was significantly文開 increased from 74.8 to 95.0 %. IC an月木d in situ FTIR results suggest th間來at the main products小了 were NO₃^- and NO₂^- in liquid phase and N₂O, N₂O₅ and HNO₃ in gas phase during the CaSO₃ absorption process.