| The dielectric barrier discharge (DBD for short) is one of Non-thermal plasma technology, with the characteristics of high electron density, whicn can be run at atmospheric pressure, and has good prospects and applications in air pollution control area. Nitrogen oxides (NOx) removal efficiency in flue gas is determined directly from the micro-dielectric process of dielectric barrier discharge. In this paper, dielectric barrier discharge has been investaged through three ways of theoretic, simulation and experiment. The dynamic micro-discharge characterristics of DBD was simulated using SIMULINK module in Matlab and the simulation provides a reference for the experiment. The removal of NOx in flue gas processes were investaged using a coaxial cylindrical dielectric barrier reactor. New power measurement methods were designed, and the power compensation was improved. Through the improved program, the effects of reaction parameters, electrical parameters and gas composition on NOx removal rate were researched experimentally. The experiment shows these following results. Firstly, as the length of the reacter increases, NOx removal rate increases. Secondly, the smaller discharge gap is the easier discharge is. Thirdly, at a fixed power frequency, with the discharge voltage increasing, the input power and NOx removal rate also increase. Finally, with the increase of discharge frequency, NOx removal rate first increases and then decreases. When the gas composition is different, the effects to NOx removal rate are different. Ar can decrease the breakdown voltage, O2 can suppress the removal of NOx and promote NO oxidation to NO2, and O3 can obtain higher NO removal rate at a lower power. In this paper, theoretical and experimental basis are provied for the industrial applications of nitrogen oxides removal by dielectric barrier discharge.
|
PDF Full Text Request