Abstract: Experiments were conducted using a bub電睡bling reactor to investigate ni雪睡trogen oxide absorption in 通照the calcium sulfite slurry. The effects河東 of CaSO₃ concentration, NO₂/NO mole ratio and O₂ concentrations on NO₂ and SO₂ absorption efficiencies were in購腦vestigated. Five types of additiv那街es, including MgSO₄, Na₂SO₄, FeSO₄, MgSO₄/Na₂SO₄ and FeSO₄/Na₂SO₄, had been evaluated for enhancing NO₂ absorption in CaSO₃ slurry. Results showed that C影老aSO₃ concentration had significant i站木mpact on NO₂ and SO₂ absorption efficiencies, and the hi刀亮ghest absorption eff信呢iciencies of SO₂ and NO₂ could reach about 99.5 a體在nd 75.0 %, respectively時術. Furthermore, the NO媽件₂ absorption was closely related to我什 the NO₂/NO mole ratio, and the雪近 existence of NO₂ in flue gas may promote NO ab車就sorption. The presence of O₂ in simulated flue gas was disa離亮dvantage for NO(x) removal because 秒體it can oxidize sulfite to sul著不fate. It was worth pointing out that 體書FeSO₄/Na₂SO₄ was the best additiv歌綠e among those investigated add少就itives, as the NO₂ removal efficiency was signific舊日antly increased from通匠 74.8 to 95.0 %. IC an冷動d in situ FTIR results suggest that秒購 the main products were亮笑 NO₃^- and NO₂^- in liquid phase and N₂O, N₂O₅ and HNO₃ in gas phase during the CaSO₃ absorption process.