【作者】 郭广勇；

【导师】 白希尧；

【作者基本信息】 大连海事大学 ， 环境科学， 2002， 硕士

【摘要】 目前大气污染情况日益严重，内燃机的有害排放是造成大气污染的一个重要原因，而NOx是大气中形成光化学烟雾和酸雨的主要污染物。本文结合国家自然科学基金重点资助项目“高气压下强电场电离气体的方法及其应用研究”以及交通部项目“介质阻挡放电强化内燃机燃烧及尾气治理研究”，以治理NOx为主要研究对象，在常温下利用介质阻挡放电产生非平衡等离子的方法对NOx（NO、NO₂）进行直接治理的研究。 采用介质阻挡放电的方法在等离子体反应器内形成强电场，电子被强电场激励获得了能量，被加速了的电子与内燃机尾气发生弹性碰撞，形成大量的非平衡等离子体，NO和NO₂等气体分子发生电离、分解等化学反应后被还原成无害N₂和O₂等气体。 本文研究NO混合模拟气体和汽油机尾气NOx等脱除实验，得出如下结论： 1．折合电场强度对NOx脱除的影响很大。初始浓度一定条件下，NO的浓度随着折合电场强度的升高迅速下降，NO脱除率达到91.2％：由于部分NO氧化形成NO₂，NO₂的浓度较放电前有明显增加，但NOx的浓度（NO、NO₂）是降低的，脱除率达到49.3％。介质阻挡放电将成为治理内燃机尾气NOx的有效新方法。 2．大量实验数据表明，内燃机尾气的处理流量、NOx初始浓度对NOx脱除率有着明显的影响。随着尾气流量、NOx初始浓度的增大，NOx脱除率下降。 3．通过调整介质阻挡放电的有关参数（E/n、Te）控制了等离子体化学反应过程，进而实现用电场强度、电子能量来控制NOx脱除率的目的。更多还原

【Abstract】 The pollution of atmosphere is becoming seriously, the exhaust of gas engine is a main reason to cause this problem, NOx can form photochemistry and acid rain. This paper is aim to reduce NOx with dielectric barrier discharge at normal pressure, which is based on "the study on strengthening combustion of engine and reduction of exhaust gas with ion discharge" and "the method and application of ionizing gas with strong electric field ".Strong electric field can be formed in the plasma reactor with barrier discharge. Electrons become non-equilibrium when they get energy in the field, after ex citing > ionizing and decomposing the molecules of NO and NO2 are reduced.The conclusions can be get from the experiments of simulating gas and exhaust gas of gasoline engine:1. The concentration of NOx are effected by reduced electric field, when the original concentration is fixed,the concentration of NO decrease sharply when the field increase, the reduction rate of NO is 91.2%; but the concentration of NOa increase distinctly because of oxidation of NO, the reduction rate is 49%. Treating NOx exhaust gas with dielectric barrier discharge will become one of the most effective method in the future.2. By adjusting the parameter of dielectric barrier discharge, such as E/n and Te , reduction rate of NOx can be controlled.3. The experiment data show that flow of exhaust gas and initial concentration can effect reduction rate, when flow rate and initial concentration become larger, reduction rate of NOx drop.更多还原