Abstract: Experiments were conducted using a b看月ubbling reactor to inv南空estigate nitrogen oxide absorp他子tion in the calcium sulfite slurry. T讀就he effects of CaSO₃ concentration, NO₂/NO mole ratio and O畫鐵₂ concentrations on NO₂ and SO₂ absorption efficiencies were investi務人gated. Five types of additives, inc河行luding MgSO₄, Na₂SO₄, FeSO₄, MgSO₄/Na₂SO₄ and FeSO₄/Na₂SO₄, had been evaluated for enha木紙ncing NO₂ absorption in CaSO₃ slurry. Results showed that CaSO₃ concentration had signif小光icant impact on NO₂ and SO₂ absorption efficiencies, and the h得在ighest absorption efficiencies of術拿 SO₂ and NO₂ could reach about 99.農還5 and 75.0 %, respectively. 車務Furthermore, the NO₂ absorption was closely related to東坐 the NO₂/NO mole ratio, and the existence of NO謝話₂ in flue gas may promote NO absorp知在tion. The presence o雪哥f O₂ in simulated flue gas was di員我sadvantage for NO(x) rem愛很oval because it can 什湖oxidize sulfite to sulfate. It w熱下as worth pointing out that FeSO₄/Na₂SO₄ was the best additive among thos個我e investigated additives, as t員明he NO₂ removal efficiency wa吧白s significantly increased from 7從見4.8 to 95.0 %. IC and i工慢n situ FTIR results su了唱ggest that the main products were議做 NO₃^- and NO₂^- in liquid phase and N₂O, N₂O₅ and HNO₃ in gas phase during the CaSO₃ absorption process.