Abstract: Experiments were conducted us章女ing a bubbling reactor to 中書investigate nitrogen綠能 oxide absorption in th明科e calcium sulfite slurry. The effects飛票 of CaSO₃ concentration, NO₂/NO mole ratio and O從湖₂ concentrations on NO₂ and SO₂ absorption efficiencies were investigat公器ed. Five types of additives,行月 including MgSO₄, Na₂SO₄, FeSO₄, MgSO₄/Na₂SO₄ and FeSO₄/Na₂SO₄, had been evaluated for enha他光ncing NO₂ absorption in CaSO₃ slurry. Results showed t自購hat CaSO₃ concentration had signific慢女ant impact on NO₂ and SO₂ absorption efficienci物商es, and the highest absorption efficien也內cies of SO₂ and NO₂ could reach about 99.5 and 75.0 %, 女就respectively. Furthe農科rmore, the NO₂ absorption was closely related to th吃報e NO₂/NO mole ratio, and the existenc笑嗎e of NO₂ in flue gas may promot雪雜e NO absorption. The prese工劇nce of O₂ in simulated flue gas視科 was disadvantage for NO報土(x) removal because 討問it can oxidize sulfite to 如很sulfate. It was worth pointing out th村是at FeSO₄/Na₂SO₄ was the best additive among those i光快nvestigated additives, as 討知the NO₂ removal efficiency was signif間坐icantly increased from 74.8 to 95.0報媽 %. IC and in situ FTIR results sug術科gest that the main products were NO₃^- and NO₂^- in liquid phase and N₂O, N₂O₅ and HNO₃ in gas phase during the CaSO話工₃ absorption process.