【作者】 夏刚；

【导师】 冉振亚；

【作者基本信息】 重庆大学 ， 车辆工程， 2007， 硕士

【摘要】 随着汽车保有量的不断增加,汽车尾气中有害污染物的大量排放所带来的大气污染问题日趋严重,包括机内净化措施和机外净化措施的各种汽车尾气净化措施已经得到了广泛的研究。近年来,利用低温等离子体技术治理各种有害气体在国内外都得到了重视。本文提出的利用磁电等离子体极化激发态技术降低汽车尾气排放的方法是基于一种新的思路,它作用于发动机进气,使进气空气成为活性很强的极化激发态气体,从而改善内燃机燃烧状况,达到降低尾气排放的目标。本文基于气体放电的基本理论对低温等离子体的产生机理进行了研究,讨论了低温等离子体基元反应过程,同时研究了磁电等离子体极化激发态降低汽车尾气中主要有害污染物的机理,开发了磁电等离子体极化激发态进气装置。通过台架实验,研究了该反应器降低汽车有害污染物的基本情况,同时研究了各种相关因素对该反应器净化效果的影响规律,相关因素包括电源电压和频率、放电反应管结构型式、放电反应管通电数目、放电反应管长度和内径。另外,磁环组对净化效果的影响也作了实验研究。文中对各种因素变化对净化效果的影响作了合理的解释。通过对磁电等离子体极化激发态降低汽车尾气的实验及数据分析,得到如下主要的结论:①磁电等离子体极化激发态进气装置能够对CO、HC和NOx达到较好的净化效果,在各种影响因素处于较好情况的实验条件下,三种主要尾气的净化率分别达到43%,51%和30%。②随着电源电压和电源频率的提高,放电反应管通电数目的提高,放电反应管长度的增加和内径的减小,CO和HC的净化率相应的提高,但同时由于放电效果的提高,会加剧NOx排放的增加。③本文设计了三种放电反应管结构,分别为单侧栅格式,两侧栅格式和两侧螺旋式。相对于单侧栅格式和两侧栅格式,采用两侧螺旋式的放电反应管,放电效果更好,CO和HC的净化率更高。④加装磁环组能够明显降低NOx的排放浓度,并且有效提高CO和HC的净化率。在放电反应器作用的情况下,当加装磁环组时,CO、HC和NOx的排放浓度相应的降低9%、11%和74%。更多还原

【Abstract】 With the increasing of the amount of the automobile continuously, the air pollution becomes more and more serious for the great amount of automobile exhaust. Both the purify way of inside machine and outside machine have been researched widely. In recent years, the way to purify the all kinds of automobile exhaust by the low temperature plasma technology was attached all over the world. The way to reduce the engine exhaust by magnetism electric plasma polarize explode state technology is a new thinking, which acts on the ingoing air, becomes the air as polarize explode state gas. Then it can improve the status of the engine burning and the exhaust can be purified.The principle of discharge of low temperature plasma is researched by studying the basic theory of discharge in this paper and the reaction course of low temperature plasma is discussed. Meanwhile, the principles of magnetism electric plasma polarize explode state purify the main engine exhaust are researched. The magnetism electric plasma polarize explode state ingoing gas device is developed. The basic situation of engine exhaust that is purified by the device is studied. The all kinds of factors that affect the purify effect of the device is also studied, include the voltage and the frequency of power and construction of discharge tube and the number of electrify tube and the length and radius of tube. Otherwise, the magnetism loop group is also studied. The rational explain is given in this paper for all kinds of transformation of purify results.The main conclusions are listed by analyzing the data of exhaust purify experiment:①The purify effect of magnetism electric low temperature plasma purify the CO, HC and NOx from automobileexhaust is good. Their purify rate are 43%, 51% and 30% in the normal experiment condition.②with the increasing of voltage and the frequency and the number of electrify discharge tubes and the length of discharge tube and the decreasing of the inside radius of the discharge tube, the purify effect of CO and HC are better. However, the concentration of NOx will increase because the better effect of discharge.③There are three constructions of discharge tube in this paper. The constructions of tubes are grid in inside and grid in two sides and spire in two sides. The purify effect of CO and HC are better when the construction of tube is spire in two sides. ④The concentration of NOx can be reduce obviously by installed the magnetism loop group and the purify rate of CO and HC can also be improved. The reduce rate of concentration of CO, HC and NOx are 9%, 11% and 74% when the discharge reactor is installed.更多还原