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首页> 外文期刊>Combustion and Flame >Investigation on fuel-rich premixed flames of monocyclic aromatic hydrocarbons: Part I. Intermediate identification and mass spectrometric analysis
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Investigation on fuel-rich premixed flames of monocyclic aromatic hydrocarbons: Part I. Intermediate identification and mass spectrometric analysis

机译:单环芳烃富含燃料的预混火焰的研究:第一部分:中间物鉴定和质谱分析

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摘要

Fuel-rich premixed flames of seven monocyclic aromatic hydrocarbons (MAHs) including benzene, toluene, styrene,.ethylbenzene, ortho-xylene, meta-xylene, and para-xylene were studied at the pressure of 30 Torr and comparable flame conditions (C/O = 0.68). The measurement of photoionization efficiency (PIE) spectra facilitated the comprehensive identification of combustion intermediates from m/z = 15 to 240, while mass spectrometric analysis was performed to gain insight into the flame chemistry. Features of the sidechain structure in fuel molecule affect the primary decomposition and aromatics growth processes, resulting in different isomeric structures or compositions of some primary products. This effect becomes weaker and weaker as both processes proceed. The results indicate that most intermediates are identical in all flames, leading to similar intermediate pools of these fuels. Consequently the chemical structures of flames fueled by different MAHs are almost identical, subsequent to the initial fuel-specific decomposition and oxidation that produce the primary intermediates. On the other hand, special features of the sidechain structure can affect the concentration levels of PAHs by increasing the concentrations of the key intermediates including the benzyl radical and phenylacetylene. Therefore, the total ion intensities of the PAH intermediates in the flames were observed to increase in the order of: benzene < toluene and styrene< four C_8H_(10), which implies the same order of the sooting tendency.
机译:在30 Torr的压力和相当的火焰条件下(C / O = 0.68)。光电离效率(PIE)光谱的测量有助于全面鉴定m / z = 15至240的燃烧中间体,同时进行质谱分析以深入了解火焰化学。燃料分子中侧链结构的特征影响初级分解和芳族化合物的生长过程,导致某些初级产物的异构体结构或组成不同。随着两个过程的进行,这种影响变得越来越弱。结果表明,大多数中间体在所有火焰中都是相同的,从而导致这些燃料的相似中间库。因此,在产生主要中间体的特定于燃料的初始分解和氧化之后,由不同的MAH燃烧的火焰的化学结构几乎相同。另一方面,侧链结构的特殊特征可通过增加包括苄基和苯乙炔在内的关键中间体的浓度来影响PAHs的浓度水平。因此,观察到火焰中PAH中间体的总离子强度按以下顺序增加:苯<甲苯和苯乙烯<四个C_8H_(10),这意味着烟so趋势的顺序相同。

著录项

  • 来源
    《Combustion and Flame》 |2010年第1期|143-154|共12页
  • 作者单位

    National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, PR China Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, N] 08544, USA;

    National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, PR China;

    National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, PR China;

    National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, PR China;

    National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, PR China;

    National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, PR China School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14850, USA;

    National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, PR China;

    Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA;

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

    synchrotron VUV photoionization mass; spectrometry; monocyclic aromatic fuels; identification of combustion intermediates; flame chemistry; PAH formation;

    机译:同步加速器VUV光电离质量;光谱法单环芳烃燃料;鉴定燃烧中间体;火焰化学PAH形成;

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