Studies On The NO Removal With The Dielectric Barrier Discharges Non-thermal Plasma

With the increasing of the percentage of mobile exhaust emissions in the total air pollution, studies on how to reduce the emission of various harmful components in the mobile exhausts, especially NOx, have become a hot issues. For their particular advantages in the cleaning of air pollution, such as high removal efficiency and low energy consumption, non-thermal plasma technologies have gradually attracted more and more attentions. With the comparison of the advantages and disadvantages of several main kinds of discharge modes and the configures of different non-thermal plasma reactors, the advantages of the utilization of dielectric barrier discharge non-thermal plasmas in the process of mobile exhausts emission are clarified.A set of chemical reaction models on the NO removal with highly energetic free electrons in the N2/NO mixture system are built, and the corresponding mathematical model is obtained. A reasonable simplified model is obtained based on the order analysis on the original mathematical model according to the numerical simulation results. With the simplified model, the analytic solution of the NO particle number density with time is achieved, which can be the base for the further analysis.A set of experiment system which can be operated safely is designed and built, with which the influences on the NO removal effects of different factors including the gas flow rate, initial NO concentration ,applied voltage and the concentration of O2 are systematically studied. The experiment results indicate that NO can be highly efficiently removed by dielectric barrier discharges and the products are N2 and O2. The NO removal efficiency will decrease with the increasing of the gas flow rate and initial NO concentration, and increase with the increasing of the applied voltage. The existence of O2 also influences the NO...