Experimental Study On Removal Of NO And SO₂ By Dielectric Barrier-corona Discharge Coupling

In the atmosphere,nitrogen oxides?NO_x?and sulfur dioxide?SO₂?are one of the main pollutants.In order to achieve removal rate of NO_x and SO₂,many technologies have been applied,and plasma desulfurization and denitration as a new technology has became one of the current research hotspots.In this paper,the dielectric barrier-corona discharge coupling reaction device which designed by ourselves was used to remove NO and SO₂ from the simulate flue gas.The effects of O₂ content,NO and SO₂ initial concentration,flow rate and other factors were investigated on single desulfurization and denitration and simultaneous desulfurization and denitration under different working conditions.The effects of O₂ content,initial concentration,flow rate and other factors on the single desulfurization and denitrification and simultaneous desulfurization were also discussed After introducing the CH₃COONH₄ into the system.The results showed that:?1?In N₂/O₂/NO,N₂/O₂/CO₂/NO,N₂/O₂/CO₂/H₂O/NO systems,the increase of O₂,CO₂,water vapor concentration,gas flow rate and initial concentration of NO would inhibit the removal of NO;but in N₂/O₂/SO₂,N₂/O₂/CO₂/SO₂,N₂/O₂/CO₂/H₂O/SO₂ systems,the increase of water vapor concentration would promote the removal rate of SO₂.Appropriate increased of O₂ concentration was beneficial to remove SO₂,but the increase of gas flow rate and initial concentration of SO₂ would inhibit the removal of SO₂;In N₂/O₂/CO₂/H₂O/NO/SO₂ system,the removal rate of SO₂ decreased with the increase of NO concentration under the condition that keeped the initial concentration of SO₂ unchanged.Under the condition that keeped the initial concentration of NO unchanged,the removal rate of NO also decreased with the increase of SO₂ concentration.Increasing the input current in the system could improve the removal rate of NO and SO₂.?2?The increase of O₂ concentration,CO₂ concentration and H₂O vapor concentration would inhibit the removal of NO,after the introduction of CH₃COONH₄,these inhibitory effects would be weakened and the removal rate of NO would be greatly increased,but its inhibitory effects would not be completely eliminated.After the introduction of CH₃COONH₄into N₂/O₂/SO₂ system,The influence of gas composition and input current on SO₂ removal was not obvious,and the removal rate of SO₂ could reach about 94%at the end of the reaction.When CH₃COONH₄ was added into N₂/O₂/CO₂/H₂O/NO/SO₂ system,under the initial concentration of NO was constant,When the content of SO₂ was low,the effect on NO removal was not obvious,the removal rate of NO decreased with the increase of SO₂concentration,the effect of SO₂ could be eliminated by increased the addition of CH₃COONH₄.On the other hand,under the condition of constant initial concentration of SO₂,with the increase of NO content,SO₂ always keeped a relatively high removal rate without change.