Abstract: The gases such as N₂，O₂，NO and SO₂ were mixed at a certain ratio in the lab to simulate industry flue gas. The simulated flue gas and ozone were put to ozone reactor. The effects of the parameters such as O₃/NO mole ratio，temperature and different absorption solution on removal efficiencies of NO and SO₂ were studied. The experimental results showed that NO can be oxidized efficiently by O₃ in liquid phase，while the existence of SO₂ has a negative impact on the removal of NO. Under the condition of O₃/ NO=1，the NO removal efficiency is 93.12%. When the absorption solution was changed from distilled water to Na₂CO₃ solution，the removal efficiencies of NO and SO₂ increased. It can be found that the removal efficiencies of NO and SO₂ appeared to have a slight decline trend at 20～60℃，but the change is not big.

Key words: flue gas, desulfurization, denitrification, ozone, removal efficiency