【作者】 陈松玲；

【导师】 路淼；

【作者基本信息】 江苏大学 ， 环境工程， 2005， 硕士

【摘要】 本文对低温等离子体净化汽车尾气化学动力学模型进行了研究。通过对化学动力学模型的分析,探讨低温等离子体净化汽车尾气的动力学特点。通过对介质阻挡放电特性的分析,设计了一套实验系统。根据尾气净化的化学反应机理,列出其相应的化学动力学方程。推导了电子撞击N₂和O₂的反应速率常数计算公式,建立过程动力学模型,用matlab编程求解,进行计算机模拟。根据模拟结果分析了电子浓度和电子能量对N₂分解的影响,模拟了NO反应过程和其他副产物NO₂、NO₃和N₂O₅的变化趋势。 根据所建立的模型,对NO去除率随O₂含量、输入电压、气体流量的变化而变化的情况进行了模拟,并在设计的实验系统上进行了验证,模拟结果与实验结果比较吻合,说明所建模型是可靠的。 根据模拟结果和实验验证,得出:①随着O₂含量的增加,NO的去除率降低而生成的NO₂增加,尾气中的O₂不利于NO的去除。②提高输入电压会使NO的去除率增加,但当电压达到一定的值后,NO的去除率随电压升高变化很小,而NO₂浓度随着输入电压的升高先减少后增加,所以输入电压并不是越高越好,达到一定的值15～16KV时,NO的净化效果较好。③NO去除受到气体流量的影响,随着气体流量的增加,NO的去除率减小,所以减小气体流量有利于尾气净化。更多还原

【Abstract】 In this paper, the model of chemical kinetics for the automobile exhaust control using non-thermal plasma is carried out. By analyzing this model, we has discussed the kinetic characteristic of emission control. An experimental system is designed based on the quality of dielectric barrier discharge. According to mechanism of the chemical reaction, the corresponding kinetic equation is listed. Formula of reaction rate constant for electron impacting N₂ and t O₂ is derived. A kinetic model is established, it is soluted with matlab programming, and carried on computer simulation.On the base of simulation result, effect of electronic concentration and electronic energy on decomposition of N₂ is analyzed, and the course of NO reaction and variation tendency of other byproducts NO₂, NO₃ and N₂O₅ is simulated.According to the model set up, the relationship between the rate of NO removal and O₂ concentration, the input voltage and gas flux is simulated. The experiment has proved that experimental result has a good coherence with the simulation. This validates the reliability of the model.We have drawn conclusions from the simulation and experimental result:（1）With the increase of O₂ concentration, the NO removing rate has decreased and NO₂ concentration has increased. So oxygen in the exhaust makes against to the elimination of NO. （2）Enhancing input voltage raises the NO removing efficiency, but after input voltage reaching certain value, the rate changes with the voltage very slightly. And NO₂ density has risen first and then reduced with input voltage rising. Therefore while the input voltage reaching 15-16kV, the purification result of NO is better.（3）NO elimination is also influenced by gas flux, and with the addition of the flow of gas, the rate has reduced, so it is favorable to exaust removal to reduce the gas flux.更多还原