Studies On The Reduction Of NOx From Exhaust Gas With Dielectric Barrier Discharge Plasma

The pollution of atmosphere is becoming seriously, the exhaust of gas engine is a main reason to cause this problem, NOx can form photochemistry and acid rain. This paper is aim to reduce NOx with dielectric barrier discharge at normal pressure, which is based on "the study on strengthening combustion of engine and reduction of exhaust gas with ion discharge" and "the method and application of ionizing gas with strong electric field ".Strong electric field can be formed in the plasma reactor with barrier discharge. Electrons become non-equilibrium when they get energy in the field, after ex citing > ionizing and decomposing the molecules of NO and NO2 are reduced.The conclusions can be get from the experiments of simulating gas and exhaust gas of gasoline engine:1. The concentration of NOx are effected by reduced electric field, when the original concentration is fixed,the concentration of NO decrease sharply when the field increase, the reduction rate of NO is 91.2%; but the concentration of NOa increase distinctly because of oxidation of NO, the reduction rate is 49%. Treating NOx exhaust gas with dielectric barrier discharge will become one of the most effective method in the future.2. By adjusting the parameter of dielectric barrier discharge, such as E/n and Te , reduction rate of NOx can be controlled.3. The experiment data show that flow of exhaust gas and initial concentration can effect reduction rate, when flow rate and initial concentration become larger, reduction rate of NOx drop.