Abstract: Experiments were conducte匠鐘d using a bubbling reactor 理服to investigate nitro民歌gen oxide absorption i窗鐘n the calcium sulfite sl是窗urry. The effects of CaSO₃ concentration, NO₂/NO mole ratio and O₂ concentrations on NO₂ and SO₂ absorption efficiencies were i一制nvestigated. Five types of additives, 有哥including MgSO₄, Na₂SO₄, FeSO₄, MgSO₄/Na₂SO₄ and FeSO₄/Na₂SO₄, had been evaluated for enha金火ncing NO₂ absorption in CaSO₃ slurry. Results showed that CaSO₃ concentration had significant imp筆冷act on NO₂ and SO₂ absorption efficiencies, and the highe船知st absorption efficiencies of SO₂ and NO₂ could reach about 99.5 and 75.0 %, r票姐espectively. Furthermor都樹e, the NO₂ absorption was closely related t的風o the NO₂/NO mole ratio, and the exis月湖tence of NO₂ in flue gas may promote NO absor就照ption. The presence of O₂ in simulated flue gas wa唱如s disadvantage for NO(x) rem們少oval because it can oxidiz議算e sulfite to sulfate.放東 It was worth pointing out that FeS紙照O₄/Na₂SO₄ was the best additive among those inv吧朋estigated additives, as the NO兒線₂ removal efficiency was sig事河nificantly increased from 74.8 to 9你員5.0 %. IC and in situ FTIR r下朋esults suggest that the main products 亮票were NO₃^- and NO₂^- in liquid phase and N₂O, N₂O₅ and HNO₃ in gas phase during the CaSO₃ absorption process.