Polycyclic aromatic hydrocarbon and soot emissions in a diesel engine and from a tube reactor
Polycyclic aromatic hydrocarbon and soot emissions in a diesel engine and from a tube reactor
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DOI：
10.1016/j.jksues.2020.12.007
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
H. A. Dandajeh;M. Talibi;N. Ladommatos;P. Hellier
中科院分区：
文献类型：
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作者：
H. A. Dandajeh;M. Talibi;N. Ladommatos;P. Hellier
报道了对柴油机尾气中致癌物多环芳烃（PAHs）的排放情况进行了调查。该研究得到了旨在检查这些燃料中多环芳烃形成过程的管式反应器的实验结果的支持。本文以美国环境保护署（US-EPA）建议的16种重点多环芳烃为中心。这些多环芳烃是通过燃烧传统柴油燃料和几种由不同比例的甲苯与庚烷混合而成的二元燃料产生的。对已知的人类致癌物多环芳烃的B2亚组给予了特别考虑。气体生成的（较小的）多环芳烃，以及较大的多环芳烃，吸附在颗粒进行了研究。所使用的发动机是一台单缸、轻型、高速、柴油汽车研究发动机，在7巴的指示平均有效压力（IMEP）下运行。在1050至1350°C的温度下，在热解（无氧）条件下，在管式反应器中产生颗粒物质，以研究多环芳烃和烟灰的形成，在某种程度上类似于柴油发动机燃料喷雾核心的条件。在柴油机中，多环芳烃的排放受到热释放速率和点火延迟等燃烧特性的影响。然而，在反应器的静态无氧条件下，燃料的化学成分和温度主导了多环芳烃的形成。
An investigation into the exhaust emissions of carcinogenic polycyclic aromatic hydrocarbons (PAHs) from a diesel engine was reported. The study is reinforced by the experimental results obtained from a tube reactor aimed at examining the PAH formation processes from these fuels. The paper cantered on the 16 priority PAHs suggested by the United States Environmental Protection Agency (US-EPA). These PAHs were produced by burning conventional diesel fuel and a few binary fuels prepared by blending various proportions of toluene into heptane. Special consideration was given to the B2 subgroup of PAHs which are known human-carcinogens. Both the gas born (smaller) PAHs, as well as the larger PAHs, adsorbed onto the particulate were investigated. The engine used was a single-cylinder, light duty, high speed, diesel automotive research engine run at an Indicated Mean effective pressure (IMEP) of 7 bar. Particulate matter was also produced in a tube reactor at temperatures ranging from 1050 to 1350 °C under pyrolysis (oxygen-free) conditions to study PAH and soot formation in conditions which resemble, to an extent, those found in the core of diesel engine fuel sprays. In the diesel engine, it was found that exhaust PAHs were influenced by combustion characteristics like heat release rates and ignition delay. However, in the quiescent oxygen-free conditions of the reactor, chemical composition of the fuels and temperature dominated PAH formation.