摘要
利用反应动力学模拟开展了电源特性对脉冲介质阻挡放电条件下NOx净化脱除规律的影响研究,对高能电子参与的N2、O2和O的电离解速率常数采用碰撞反应截面方法求取,并通过数值模拟获得了反应器内活性基元、NO及其副产物随时间的变化规律.模拟结果表明动力学模型较好地反映了活性基团浓度的脉冲变化趋势,电源特性对NO的脱除具有明显的影响,提高纳秒级脉冲峰宽及电源脉冲放电频率,均可以有效改善NO的净化效果,这些结果对等离子体氮氧化物净化装置的优化有一定的指导作用.
In this paper, the impacts of the characteristics of the power supply on the removal of NOx under the dielectric barrier discharge are investigated by chemical kinetic simulation theoretically. The reaction rate constant of the ionization of N2 ,O2 and O by electron-impact dissociation is obtained by the collision cross section method. The concentrations of active ions, atoms, free radicals and NO byproducts are predicted according to the resident time in plasma reactor. The simulation results show that the kinetic model reflects the generation of the various active radicals properly. The impact of the characteristic of the power supply on NOx removal is obvious. Increasing the positive pulse time and the frequency of pulsed discharge will improve the removal of NO. This work will play an institutive role in optimizing the NO purification device.
出处
《南京师范大学学报（工程技术版）》
CAS
2009年第1期35-39,共5页
Journal of Nanjing Normal University(Engineering and Technology Edition)
基金
"973"国家重大基础研究发展规划(2006cb200302)
江苏省自然科学基金(BK2007224)
国家教育部留学回国人员科研启动基金资助项目
关键词
电源特性
脉冲介质阻挡放电
NOx
净化
characteristics of the power supply, pulsed dielectric barrier discharge, NOx, purification
