定容燃烧过程中苯与芳香烃排放规律

Emissions of benzene & polycyclic aromatic hydrocarbons in constant volume combustion process

为了掌握燃烧过程中苯及常见的芳香烃的生成规律,设计定容燃烧弹装置,对定容燃烧弹燃烧过程进行分析,并模拟汽油机燃烧过程,进行了有机物排放的试验研究,通过气相色谱-质谱联用分析仪得到苯及多环芳香烃的排放量。试验结果分析表明,燃烧产物中的部分苯源于未完全燃烧的燃油;燃烧过程中热解出的小分子自由基也会形成苯;在燃料中添加乙醇后,苯的排放量并不一定增加,取决于各组分的浓度;多环芳香烃的生成量随温度的不同而变化。

In order to master the theory of benzene and polycyclic aromatic hydrocarbons generated in combustion process,a constant volume combustion bomb was designed,combustion process was analyzed,a series of tests were conducted,and the emissions of benzene and polycyclic aromatic hydrocarbons were measured by a gas chromatography-mass spectrometry analyzer.The results indicate that some of benzene in exhaust is from the incomplete combustion fuel.The free radicals out of cracking fuel in combustion process may also react to form benzene.The ethanol added into the fuels unnecessarily helps to increase the emission of benzene,for it depends on the concentration of component.The emissions of polycyclic aromatic hydrocarbons varies with temperature.