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Effects of the variation in diesel fuel components on the particulate matter and unregulated gaseous emissions from a common rail diesel engine

机译:柴油成分变化对共轨柴油机颗粒物和不受控气体排放的影响

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摘要

Diesel fuel mainly contains n-alkanes, iso-alkanes, cycloalkanes and aromatics, and varies with the source of crude oil and refining process. Although satisfying the same emission regulation, the particulate matter (PM) emissions and unregulated gaseous emissions of diesel fuel maybe vary a lot due to different fuel components. A series of experiments was conducted on a single-cylinder diesel engine fueled with diesel respectively blending with 10% and 20% fuel components to study the aldehyde, olefins, methane emissions and particulate matter (PM) emissions under engine loads from indicated mean effective pressure (IMEP) 1 bar to 8 bar. In this study, ndodecane, iso-dodecane, tetralin and decalin were chosen to represent n-alkanes, iso-alkanes, aromatics and cycloalkanes, respectively. The results show that when IMEP less than 4 bar, the aldehydes emissions are relatively high even above 100 ppm. Blending fuel components in diesel causes the aldehydes emissions increasing except for n-alkanes. At low load from IMEP 1 to 3 bar, as blending ratio increase, aromatics and iso-alkanes noticeably worsen the hydrocarbon emissions especially. The hydrocarbon emissions of diesel/20% iso-dodecane and diesel/20% tetralin are respectively more than twice over those of diesel/10% iso-dodecane and diesel/10% tetralin. Aromatics and cycloalkanes have relatively high-level particle numbers which mainly distribute in nucleation mode with diameter ranging from 10 nm to 50 nm at IMEP 1 bar and 2 bar because of their lower H/C ratio leading to a tendency for precursor formation. At heavy load, the particle number presents a regular pattern that n-alkanes cycloalkanes iso-alkanes aromatics and the peak value of particle size distribution moving towards to the right side due to prolonged combustion duration resulting in more time to polymerize.
机译:柴油燃料主要包含正构烷烃,异烷烃,环烷烃和芳烃,并随原油来源和精炼工艺的不同而变化。尽管满足相同的排放法规,但柴油燃料的颗粒物(PM)排放和不受管制的气态排放可能会因燃料成分不同而发生很大变化。在分别装有10%和20%燃料成分的柴油驱动的单缸柴油机上进行了一系列实验,研究了发动机负荷下根据指示的平均有效压力所产生的醛,烯烃,甲烷排放和颗粒物(PM)排放。 (IMEP)1 bar至8 bar。在这项研究中,选择正十二烷,异十二烷,四氢化萘和十氢化萘分别代表正烷烃,异烷烃,芳烃和环烷烃。结果表明,当IMEP小于4 bar时,即使高于100 ppm,醛的排放也相对较高。在柴油中混合燃料成分会导致除正构烷烃外的醛类排放量增加。在IMEP 1至3 bar的低负荷下,随着混合比的增加,芳烃和异烷烃尤其会显着恶化碳氢化合物的排放。柴油/ 20%异十二烷和柴油/ 20%四氢萘的碳氢化合物排放量分别是柴油/ 10%异十二烷和柴油/ 10%四氢萘的碳氢化合物排放量的两倍以上。芳族化合物和环烷烃具有相对较高的颗粒数,这些颗粒主要以成核模式分布,在IMEP 1 bar和2 bar时直径范围为10 nm至50 nm,这是因为它们的H / C比率较低,导致形成前体的趋势。在重负荷下,颗粒数呈现出规则的模式,即正构烷烃>环烷烃>异链烷烃>芳族化合物,并且由于燃烧时间延长,粒径分布的峰值向右侧移动,导致更多的聚合时间。

著录项

  • 来源
    《Fuel》 |2018年第15期|279-289|共11页
  • 作者单位

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Diesel fuel components; n-Dodecane; iso-Dodecane; Tetralin; Decalin; Unregulated gaseous emissions; Particulate matter emissions;

    机译:柴油组分;正十二烷;异十二烷;四氢萘;十氢化萘;不规则气体排放;颗粒物排放;

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