脉冲电晕放电脱除NO化学反应动力学过程

采用非接触的色散荧光发射光谱和时间分辨光谱方法，在大气压条件下，对脉冲电晕放电脱除NO的化学反应动力学过程进行了实验研究。在该研究中，首先利用色散荧光发射光谱方法，得到纯NO气体脉冲电晕放电中各活性粒子的色散荧光谱，并对其进行归属，确定了各活性粒子的灵敏指纹跃迁谱线;在此基础上，通过测量NO气体放电过程中所产生的N+,O，N₂及NO分子的灵敏指纹跃迁谱线的时间行为特性，研究脉冲电晕放电脱除NO的化学反应机理。实验结果表明：在脉冲电晕放电过程中，NO分子首先与高能电子发生非弹性电离碰撞，变成NO+离子，随后NO+离子发生解离反应，形成N+离子和O原子;N+离子在向阴极运动过程中与电子碰撞结合成激发态N原子，继而和其他激发态N原子结合成为激发态N₂;而O原子则应与其它O原子结合成为O₂。由此建立了大气压条件下纯NO气体脉冲电晕放电脱除NO的化学反应动力学模型。

Study on the Reaction Mechanism of NO Removal by Pulse Corona Discharge

Chemical reaction kinetics of NO removal by pulse corona discharge under the condition of normal atmospheric pressure was studied by using dispersive fluorescence spectrum and time-resomved spectrum. The fluorescence spectrum of NO pulse corona discharge was obtained. Moreover, dactylograms of NO, and those of the N , O, N2, produced in the process of discharging were confirmed by attributing the fluorescence spectrum, and then the time behaviors of these particles were studied by analyzing these dactylograms. The results show that, the NO molecule turns to NO ion after colliding with high-energy electron, and then the NO ion breaks down to N and O. Subsequently, the N ion turns to N atom after absorbing an electron and then combines with another N atom, while the O atom turns to O2 molecule when combining with another O. From these results, the chemical kinetics model of NO removal by pulse corona discharge was proposed, which is helpful to increasing NO removal rate.