The Research Of Reactor Structural Optimization As Well As Influence Of Power Parameters And Gas Conditions On Plasma Denitriflcation

Dielectric barrier discharge plasma contains two types of reactions： NOoxidation removal and reduction removal. The structural parameters of the reactor、power conditions、gas composition and concentration do impact on two types of NOremoval reaction.Experimental method was adopted, I do optimize on line-drumglass dielectric barrier discharge reactor structure do exprimental study on powersupply conditions、 simulation the composition and concentration of the gasdistribution to the removal of the two types of NO removal reactions. The conclusionsare as follows:1、The diameter of the high voltage electrode do impact on discharge inceptionvoltage, in case of the fixed barrier inner diameter and discharge voltage, with theelectrode diameter increased, although the discharge gap is reduced, but the strengthof the electric field does not increase. due to the increase of electrode diameter, thebreakdown voltage increased, simply increase the electrode diameter, the plasma fieldintensity does not increase but decreases; The inner diameter of the dielectric tube hasa great influence on discharge, the diameter of the inner electrode and the dischargevoltage is constant, with increases of pipe inner diameter, the discharge producedplasma strength weakened, finally discharge is terminated. With barrier medium pipediameter decreases, the discharge intensity gradually increased, leading to unstableplasma field. Therefore, the inner diameter can not be arbitrarily increased or reduced,there is an optimal diameter. The length of the copper mesh covered do affects to theresidence time of the gas in the plasma field, long residence time is conducive to theremoval of NO.2、 In case of N₂/O₂/NO, after the breakdown voltage is reached, with the peakof voltage increased, the input power increased, NO removal rate increased, Primarily NO removed through reduction, only a small amount of NO is oxidized to NO₂, NOremoval by reduction is dominant.。With the same with air condition, the dischargefrequency changed，NO removal by oxidative and reductive were both increased firstand then decreased.3、 Power parameters and reactor structure are determined:（1） in case ofN₂/NO, with NO initial concentration increased, NO removal rate decreased, but theoverall ratio can reach to97%, NO almostly removed by reduction.（2） in case ofN₂/NO/O₂, with O₂content increased, NO removal by reductive was inhibited andoxidation removal rate enhanceed, excess O₂added will react with carrier gas N₂generates NO, O₂content increase go against to NO removal.（3） Dry gas streamand a small amount of water vapor under conditions of N₂/NO/O₂/SO₂,docomparative experiments, NO removed by oxidative and reductive are both inhibited,SO₂can be hardly removed. Containing a small amount of water vapor, NO removedby reduction and oxidation suppressed even more, but show some SO₂removed.