Size distribution, chemical composition and oxidation reactivity of particulate matter from gasoline direct injection (GDI) engine fueled with ethanol-gasoline fuel
Size distribution, chemical composition and oxidation reactivity of particulate matter from gasoline direct injection (GDI) engine fueled with ethanol-gasoline fuel
复制标题
使用乙醇汽油燃料的汽油直喷 (GDI) 发动机颗粒物的粒径分布、化学成分和氧化反应性
DOI：
10.1016/j.applthermaleng.2015.06.060
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发表时间：
2015-10-05
影响因子：
6.4
通讯作者：
Huang, Zhen
中科院分区：
文献类型：
--
作者：
Luo, Yueqi;Zhu, Lei;Huang, Zhen
近年来，乙醇汽油混合燃料在市场上得到了广泛应用，因为乙醇可以减少生命周期温室气体排放并提高抗爆性能。然而，其对汽油直喷（GDI）发动机颗粒物（PM）排放的影响仍需要进一步研究。本研究研究了乙醇-汽油混合燃料对GDI发动机颗粒尺寸分布、数量浓度、化学成分和烟灰氧化活性的影响。研究发现，乙醇-汽油混合燃料在低负荷运行条件下增加了颗粒数浓度。在较高负荷条件下，乙醇-汽油可有效降低颗粒数浓度，这表明乙醇的化学效益占主导地位，可以减少汽油中的烟灰前体物，例如大的正构烷烃和芳烃。乙醇-汽油颗粒物中的挥发性有机物质量分数高于汽油颗粒物中的挥发性有机质量分数，因为乙醇减少了燃烧过程中烟灰前体的量，从而降低了PM中元素碳的比例。添加乙醇还增加了小颗粒的比例，这证实了乙醇对有机成分的影响。乙醇汽油降低了大多数多环芳烃的浓度，除了具有小芳环的多环芳烃，例如萘。乙醇汽油产生的烟尘比汽油产生的烟尘具有更低的氧化活化能。本研究的结果表明，乙醇汽油对 PM 排放控制具有积极作用，因为在中等和高发动机负荷下，烟灰氧化活性得到改善，颗粒数量浓度降低。 (C) 2015 Elsevier Ltd. 保留所有权利。
Ethanol-gasoline blended fuels have been widely applied in markets recently, as ethanol reduces life-cycle greenhouse gas emissions and improves anti-knock performance. However, its effects on particulate matter (PM) emissions from gasoline direct injection (GDI) engine still need further investigation. In this study, the effects of ethanol-gasoline blended fuels on particle size distributions, number concentrations, chemical composition and soot oxidation activity of GDI engine were investigated. It was found that ethanol-gasoline blended fuels increased the particle number concentration in low-load operating conditions. In higher load conditions, the ethanol-gasoline was effective for reducing the particle number concentration, indicating that the chemical benefits of ethanol become dominant, which could reduce soot precursors such as large n-alkanes and aromatics in gasoline. The volatile organic mass fraction in ethanol-gasoline particulates matter was higher than that in gasoline particulate matter because ethanol reduced the amount of soot precursors during combustion and thereby reduced the elemental carbon proportions in PM. Ethanol addition also increased the proportion of small particles, which confirmed the effects of ethanol on organic composition. Ethanol-gasoline reduced the concentrations of most PAH species, except those with small aromatic rings, e.g., naphthalene. Soot from ethanol-gasoline has lower activation energy of oxidation than that from gasoline. The results in this study indicate that ethanol-gasoline has positive effects on PM emissions control, as the soot oxidation activity is improved and the particle number concentrations are reduced at moderate and high engine loads. (C) 2015 Elsevier Ltd. All rights reserved.