论文部分内容阅读
1 前言近些年来,柴油机的排气已成为污染环境的主要排放源。据测量分析,柴油机的排气中含有NOx、SOx、碳烟微粒、HC和CO等,另外还有一些金属如As、Pb、Cd和Be等。 NOx中最常见的有NO、NO_2,也有N_2O、NOxOy。NO_2是有毒化合物,会使人产生肺气肿,NO会在大气中进一步氧化成NO_2。NO和NO_2还对烟雾和酸雨的产生起作用。SOx中主要是SO_2,也有SO_3。SO_2对人体的呼吸系统有害,SO_2和SO_3均会引起
1 Introduction In recent years, the exhaust of diesel engines has become a major source of pollution of the environment. According to the measurement and analysis, diesel exhaust contains NOx, SOx, soot particles, HC and CO, in addition to some metals such as As, Pb, Cd and Be and so on. The most common NOx, NO, NO_2, but also N_2O, NOxOy. NO 2 is a toxic compound, will cause emphysema, NO will be further oxidized to NO 2 in the atmosphere. NO and NO 2 also contribute to smoke and acid rain production. SOx mainly SO_2, but also SO_3. SO_2 harmful to the human respiratory system, SO_2 and SO_3 can cause