The Evolution Of The Nitrogen Oxide In The Non-equilibrium Plasma Of Flue Gas

With the worsening national environment,air pollution processing attract more and more national attention, Twelfth- five- year plan for our atmospheric environment propose new requirements, as a new method,non-equilibrium plasma removal of nitrogen oxides is important for us. In the recent years, the effects of the discharge voltage, air velocity, temperature and other aspects of the removal of smoke has been researched by different scholars under different forms, such as collision of energetic electrons, corona discharge, dielectric barrier discharge,but the removal mechanism has rarely been reported. This paper studies the evolution of the various particles in the flue gas at different electron density through the establishment o f a mathematical model, and uses a numerical simulation method to study the influence of electron density on the nitrogen oxide removal from flue gas.Studying show that in anaerobic systems, when the electron number density reach to 1017cm-3, NO has been removed effectively, removal efficiency reaches 99%, if the initial electron density continues to increase, i.e., when the initial electron density is 1018cm-3, we observe the evolution of N O was no significant difference contrast to the initial electron density for 1017cm-3, In despite, we increase the initial electron density, failing to improve the removal efficiency of NO. In summary, in anaerobic systems, the optimum electron density is1017cm-3, i.e., in this case, NO only ensuring NO removal rate, but also energy saving; compared to the number of electrons density, electron average energy is little obvious to the NO removal rate; With increasing of the initial number of NO, NO removal efficiency increases first and then decreases; in O2 system,studying the various particles evolution under different electron density, focusing on the evolution of NO in oxygenated conditions at different electron density; and the relation of the different content of the O2 in the flue gas and the removal efficiency, research shows that increasing O2, has a great influence on the removal of N O and NO2 formation. With the increasing of initial concentration of O2, NO removal efficiency decrease,in other words, O2 have some negative effect in the removal of NO.