缸内直喷汽油机多环芳烃排放特性的试验研究
发布时间：2018-10-20 14:55
【摘要】：在一台缸内直喷(GDI)汽油机上,分别用玻璃纤维滤膜和“聚氨基甲酸乙酯泡沫(PUF)+XAD-2”对尾气中的颗粒相和气相多环芳烃(PAHs)进行了采集,并用色谱-质谱联用仪(GC-MS)对PAHs进行了定性定量分析,研究了点火时刻和废气再循环(EGR)对PAHs排放的影响.结果表明:在缸内直喷汽油机尾气中,气相PAHs浓度远高于颗粒相PAHs浓度,在气相PAHs中主要是2环和3环等小环PAHs,而在颗粒相PAHs中则主要是4环及以上的大环PAHs.随着点火时刻的提前,尾气中PAHs总浓度呈现先减小后增加再减小的变化趋势,气相和颗粒相PAHs浓度也呈现相似的变化趋势.随着EGR率的增大,气相PAHs所占比例先减小后增大,颗粒相PAHs所占比例则先增大后减小,总PAHs的排放在整体上呈现逐渐减小的变化趋势.加入EGR后,GDI汽油机尾气的毒性显著增大.
[Abstract]:The particle phase and gas phase polycyclic aromatic hydrocarbons (PAHs) in tail gas were collected by glass fiber filter membrane and polycarbamate foam (PUF) XAD-2 in a direct-injection (GDI) gasoline engine. The effects of ignition time and exhaust gas recirculation (EGR) on PAHs emission were studied by qualitative and quantitative analysis of PAHs by chromatography-mass spectrometry (GC-MS). The results show that the concentration of gas phase PAHs is much higher than that of granular phase PAHs in the tail gas of DI gasoline engine. In gas phase PAHs, it is mainly 2 ring and 3 ring small ring PAHs, while in granular phase PAHs it is mainly 4 ring and more macrocyclic PAHs.. With the advance of ignition time, the total concentration of PAHs in tail gas decreased first and then increased and then decreased. The concentration of PAHs in gas phase and granular phase also showed a similar trend. With the increase of EGR ratio, the proportion of gas phase PAHs decreases first and then increases, while that of granular phase PAHs increases first and then decreases. The total PAHs emission decreases gradually as a whole. After the addition of EGR, the toxicity of GDI gasoline engine exhaust increased significantly.
【作者单位】： 天津大学内燃机燃烧学国家重点实验室;重庆长安汽车股份有限公司动力研究院;
【分类号】：X701
本文编号：2283496
[Abstract]:The particle phase and gas phase polycyclic aromatic hydrocarbons (PAHs) in tail gas were collected by glass fiber filter membrane and polycarbamate foam (PUF) XAD-2 in a direct-injection (GDI) gasoline engine. The effects of ignition time and exhaust gas recirculation (EGR) on PAHs emission were studied by qualitative and quantitative analysis of PAHs by chromatography-mass spectrometry (GC-MS). The results show that the concentration of gas phase PAHs is much higher than that of granular phase PAHs in the tail gas of DI gasoline engine. In gas phase PAHs, it is mainly 2 ring and 3 ring small ring PAHs, while in granular phase PAHs it is mainly 4 ring and more macrocyclic PAHs.. With the advance of ignition time, the total concentration of PAHs in tail gas decreased first and then increased and then decreased. The concentration of PAHs in gas phase and granular phase also showed a similar trend. With the increase of EGR ratio, the proportion of gas phase PAHs decreases first and then increases, while that of granular phase PAHs increases first and then decreases. The total PAHs emission decreases gradually as a whole. After the addition of EGR, the toxicity of GDI gasoline engine exhaust increased significantly.
【作者单位】： 天津大学内燃机燃烧学国家重点实验室;重庆长安汽车股份有限公司动力研究院;
【分类号】：X701
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