汽油车排放颗粒有机物高分辨率源谱特征分析

发布时间：2018-07-04 23:27

本文选题：PM_(.) + 汽油车　；参考：《中国电机工程学报》2016年16期

【摘要】：机动车源排放颗粒物是城市大气PM_(2.5)的重要来源之一。气溶胶质谱提供的高分辨数据为有机气溶胶的源解析提供了有力支持,但由于缺乏机动车源排放颗粒物的源谱信息,目前仍无法实现对于机动车源贡献的准确解析。研究基于整车转鼓实验,利用气溶胶质谱测量了进气道喷射汽油车直接排放有机颗粒物的高分辨率源谱。汽油车直接排放有机物主要由C_xH_y~+碎片构成,可能来自于未完全燃烧的燃料和润滑油的裂解。源谱的离子碎片比例及氧碳比特征受到发动机状态影响。热起动状态下,一次颗粒物受到汽油燃烧产物的影响相对较大,具有较高氧碳比。将实验测得源谱与实际大气HOA谱图进行比对表明,HOA与机动车直接排放颗粒物不完全相同,因此HOA不能准确代表机动车一次排放贡献。
[Abstract]:Particulate matter emitted from motor vehicles is one of the important sources of PM2.5 in urban atmosphere. The high resolution data provided by aerosol mass spectrometry can support the source analysis of organic aerosols. However, due to the lack of source spectrum information of particulate matter emitted from vehicle sources, it is still not possible to accurately analyze the contribution of organic aerosols to vehicle sources. Based on the whole vehicle drum experiment, the high resolution source spectra of direct emission of organic particulates from intake port gasoline vehicles were measured by aerosol mass spectrometry (aerosol mass spectrometry). The direct emission of organic matter from gasoline vehicles is mainly composed of C _ XH _ y ~ debris, which may come from the cracking of incomplete combustion fuel and lubricating oil. The ratio of ion fragments and oxygen to carbon ratio of the source spectrum is affected by the engine state. Under the condition of hot start, primary particulate matter is influenced by gasoline combustion product greatly and has high oxygen / carbon ratio. Comparing the measured source spectra with the actual atmospheric HOA spectra shows that HOA is not exactly the same as the direct emission particles from motor vehicles, so HOA can not accurately represent the contribution of primary emission of motor vehicles.
【作者单位】：北京大学环境模拟与污染控制国家重点联合实验室;清华大学汽车安全与节能国家重点实验室;
【基金】：国家重点基础研究发展计划项目(973项目)(2013CB 228503,2013CB228502) 国家自然科学基金(91544214) 中国科学院战略性先导科技专项(XDB 05010500) 中国博士后科学基金(2015M 580929)~~
【分类号】：X734.2

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