A comprehensive experimental study of low-pressure premixed C3-oxygenated hydrocarbon flames with tunable synchrotron photoionization
A comprehensive experimental study of low-pressure premixed C3-oxygenated hydrocarbon flames with tunable synchrotron photoionization
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DOI：
10.1016/j.combustflame.2007.10.012
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发表时间：
2008-02-01
影响因子：
4.4
通讯作者：
Qi, Fei
中科院分区：
文献类型：
--
作者：
Li, Yuyang;Wei, Lixia;Qi, Fei
用可调谐同步光电离和分子束质谱研究了三种不同的C3-含氧碳氢化合物（丙酮、正丙醇和异丙醇）在低压下的贫燃和富燃预混火焰。火焰物种，包括异构中间体，明确确定与测量的光电离效率光谱扫描的光子能量。大多数观察到的物种的摩尔分数分布测量通过扫描燃烧器的位置在选定的光子能量附近的电离阈值，和火焰温度分布记录使用Pt/Pt-13%Rh热电偶。与以往的研究相比，一些新的火焰物种，乙烯基、炔丙基、烯丙基]、乙烯醇、甲基乙烯酮、丙烯醇、乙基乙烯酮、甲基乙基酮、丁烯醇和1，3，5-己三炔在这项工作中被检测到，这将扩展我们对含氧烃燃烧的中间池的知识。另一方面，这些火焰的化学结构进行了比较，在全面的实验数据的基础上。结果表明，燃料分子的不同结构特征将导致中间池、异构体组成和火焰物种形成通道的变化，尤其是含氧中间体。结合前人对碳氢化合物火焰的研究，分析了碳氢化合物火焰的污染物排放和碳烟生成。这与先前的研究一致，即含氧燃料具有降低的炭黑倾向和有毒含氧副产物的潜在排放。(C)2007年，《燃烧研究所》。爱思唯尔公司出版All rights reserved.
Lean and rich premixed flames of three different C-3-oxygenated hydrocarbons (acetone, n-propanol, and i-propanol) at low pressure have been investigated with tunable synchrotron photoionization and molecular-beam mass spectrometry. Flame species, including isomeric intermediates, are unambiguously identified with measurements of photoionization efficiency spectra by scanning the photon energy. Mole fraction profiles of most observed species are measured by scanning the burner position at selected photon energies near ionization thresholds, and the flame temperature profiles are recorded using a Pt/Pt-13%Rh thermocouple. Compared with previous studies, some new flame species, e.g., vinyl, propargyl, ally], ethenol, methyl ketene, propenols, ethyl ketene, methyl ethyl ketone, butenols, and 1,3,5-hexatriyne, are detected in this work, which will extend our knowledge of the intermediate pools of oxygenated hydrocarbon combustion. On the other hand, comparisons among chemical structures of these flames have been performed, based on the comprehensive experimental data. It is concluded that different structural features of fuel molecules will cause a lot of variation in intermediate pools, isomeric compositions, and formation channels of flame species, especially for the oxygenated intermediates. Combined with previous research on hydrocarbon flames, analyses of pollutant emissions and soot formation are presented. It is consistent with previous studies that the oxygenated fuels have reduced sooting tendencies and potential emissions of toxic oxygenated by-products. (C) 2007 The Combustion Institute. Published by Elsevier Inc. All rights reserved.