Abstract: Experiments were conducted using 雪用a bubbling reactor to investigate ni知照trogen oxide absorption in the綠嗎 calcium sulfite slurry. The購信 effects of CaSO₃ concentration, NO₂/NO mole ratio and O₂ concentrations on NO₂ and SO₂ absorption efficiencies were investigat妹家ed. Five types of additives,為信 including MgSO₄, Na₂SO₄, FeSO₄, MgSO₄/Na₂SO₄ and FeSO₄/Na₂SO₄, had been evaluated for enhancing N志會O₂ absorption in CaSO₃ slurry. Results showed that CaSO₃ concentration had significant i行藍mpact on NO₂ and SO₂ absorption efficiencies, and t那紅he highest absorption effic光美iencies of SO₂ and NO₂ could reach about 99.5 and 75國愛.0 %, respectively. Furthe雨短rmore, the NO₂ absorption was closely rel草腦ated to the NO₂/NO mole ratio, and the ex習雜istence of NO₂ in flue gas may promote NO用照 absorption. The pre短師sence of O₂ in simulated flue gas 生影was disadvantage for NO(x)拍內 removal because it ca事間n oxidize sulfite to sulfate. It was wo筆東rth pointing out that FeSO₄/Na₂SO₄ was the best additive among those inv醫得estigated additives, as the也技 NO₂ removal efficiency was significantly 我問increased from 74.8 to 95.0 村劇%. IC and in situ FTIR煙紅 results suggest that the 微子main products were NO₃^- and NO₂^- in liquid phase and N₂O, N₂O₅ and HNO₃ in gas phase during the CaSO₃ absorption process.