Researches On The Removal Of Pullutants In Fiue Gas By Dielectric Barrier Discharge Plasma

CO₂ is the most common C1 energy,what can be decomposed to CO which acts as energy material and chemical raw material,but the decomposition reaction is difficult to form.In this paper,at normal temperature the decomposition of CO₂ is realized by dielectric barrier discharge?DBD?technology,which provides a new research direction for greenhouse gas emission reduction and resource utilization.Meanwhile,DBD technology is widely applied in flue gas denitrification.In this paper,combining the DBD denitrification technology with the DBD removal of CO₂ technology for laid the foundation for integrated flue gas treatment technology.First,in the simulated flue gas group,it was divided into 5.9%CO₂+19.8%O₂+N₂,and the total volume of gas was 1.69L/min,the effect of DBD on removal of CO₂ from flue gas is studied,and mainly studies the influence of power supply parameters?kinds of filling substances and gas flow rate on CO₂ removal efficiency.Research shows that the optimal frequency of experimental system is 9.2kHz and the minimum breakdown voltage of the power input is 20V,so let's make 9.2kHz as the test frequency,input voltage 20V as starting experiment voltage;The active alumina,coconut shell activated carbon and three kinds of crop straw?corn straw,rice straw,wheat straw?were respectively used as filling materials,the removal efficiency of CO₂ was order as corn stalk>rice straw>wheat straw>no filling>coconut shell activated carbon>activated alumina;effect of gas flow rate on the removal efficiency of CO₂ is relatively large,with the increase of CO₂ flow rate,CO₂ removal efficiency increases first and then decreases,and the flow rate 300ml/min,the removal efficiency of CO₂ is maximization.Secondly,in order to improve the promoting effect of straw on the decomposition of CO₂ by DBD,the crop straws were modified by acid,alkali and microwave,and the effect of modified straw on CO₂ removal was studied.The results showed that 2%NaOH solution treated corn straw?4%HCl solution treated rice straw and 3%HCl solution treated wheat straw had the best effect on CO₂ removal.Finally,in the simulated flue gas,3000ppm NO is contained and the total gas flow rate is 13.37L/min,the effect of DBD on the removal of NO in flue gas is studied.The effect of gas composition and filling material on the removal efficiency of NO and the formation rate of NO₂ is mainly studied in this part.The research shows that when the simulated flue gas containing only NO and N₂,the DBD technology is not ideal for the removal of NO;adding O₂,with the increase of O₂ content,the removal efficiency of NO increases first and then decreases,and when the content of O₂ is 3%,the effect is good;adiing C₂H₄,with the increase of C₂H₄ content,the removal efficiency of NO increased;adiing CO₂,NO removal efficiency had no significant changes;reaction by adding the best modified straw was obtained from the first part of the experiment.,the removal efficiency of NO and formation rate of NO₂ were significantly improved,and the NO removal efficiency up to 95%.