Experimental Study On Removal Of Nitric Oxide By DBD Based On DOAS Measurement Technique

The global environment,especially the air pollution,has been widely concerned by all the countries in the world.In our country,power plant emissions of gas pollutants to the atmospheric environment has brought serious threat,the removal of polluting gases and concentration monitoring system is the current research focus.Dielectric barrier discharge(DBD)is a commonly used method of plasma generation,and has broad prospects for the development of the removal of contaminated gases.In this paper,the dielectric barrier discharge plasma removal of NO as the research direction,combined with the power plant CEMS system commonly used in UV differential spectroscopy measurement technology,carried out the relevant experimental study.Based on the DBD removal of NO reaction and the principle of DOAS measurement,the experimental platform is designed.The fast part and the slow part of the spectral separation method using polynomial fitting and low-pass filtering,and reduce the measurement error,the NO gas is "pure" absorption cross-section under the experimental conditions for the measurement of NO gas concentration in the experiment for other unknown.Experiment on the removal of NO from flue gas by using DBD reactor.Through different entrance NO concentration,different gas flow,different gas temperature,different experimental conditions with different concentrations of Ar,SO2,O2,using DOAS measurement technology DBD removal efficiency of NO removal was obtained.The experimental results show that with the increase in the concentration of NO,decreased NO removal efficiency;mixed gas flow rate increases,the faster the flow rate,the removal efficiency of NO gas is low;with the increase of gas temperature,the efficiency of DBD removal of NO did not change significantly;Ar can enhance the discharge intensity and NO gas removal efficiency of DBD reaction for Ar,the higher the concentration,the removal efficiency of NO gas is higher;SO2 reduces the removal efficiency of NO gas,the higher the concentration of SO2,the NO removal efficiency is lower;the addition of O2 significantly inhibited the removal of NO,with the increase of O2 concentration,the removal efficiency of NO gas decreased significantly,but in Ar the atmosphere of the downward trend is not obvious.Finally,the efficiency of NO removal by DBD was measured by using DOAS technology.As a basic application research,this paper on improving the structure of discharge reactor and improve the removal efficiency of NO has a certain reference value,has a certain practical significance of removing and measuring integrated power plant gas pollutants in the future.