Growth characteristics of polycyclic aromatic hydrocarbons in dimethyl ether diffusion flame
Growth characteristics of polycyclic aromatic hydrocarbons in dimethyl ether diffusion flame
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DOI：
10.1016/j.fuel.2010.10.012
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发表时间：
2011-02-01
期刊：
影响因子：
7.4
通讯作者：
Arai, Masataka
中科院分区：
文献类型：
--
作者：
Hayashida, Kazuhiro;Mogi, Toshio;Arai, Masataka
实验研究了多环芳烃（PAHs）在二甲醚（DME）层流扩散火焰中的增长特性，认为多环芳烃在火焰中的增长主要是由甲基加成/环化（MAC）机理引起的.甲烷和丙烷的层流扩散火焰也进行了比较研究，其多环芳烃的增长特性已被解释为乙炔和炔丙基自由基的反应。采用激光诱导荧光（LIF）和激光诱导白炽（LII）技术分别测量了烟尘和多环芳烃的相对浓度。在测试火焰中测量来自烟灰的OH-LIF、PAHs-LIF和LII的二维图像。此外，为了研究多环芳烃在火焰中的生长特性，使用光谱仪在火焰中的几个高度处测量了多环芳烃的荧光光谱。多环芳烃的分子大小估计的基础上的发射波长区域的多环芳烃LIF的变化沿着与多环芳烃的大小。结果表明，虽然多环芳烃在未燃区的分布与甲烷和丙烷火焰相似，但LII的强度和探测范围远小于甲烷和丙烷火焰。多环芳烃的激光诱导荧光光谱表明，多环芳烃在二甲醚火焰中的生长速度远低于甲烷和丙烷火焰，因此大量小分子多环芳烃被排放到火焰外缘的OH区域. (C)2010爱思唯尔有限公司版权所有。
The growth characteristics of polycyclic aromatic hydrocarbons (PAHs) in laminar dimethyl ether (DME) diffusion flame were investigated experimentally, and we assumed that the growth of PAHs within the flame was predominantly due to methyl addition/cyclization (MAC) mechanism. Methane and propane laminar diffusion flames were also investigated for comparison, and their PAHs growth characteristics had been explained by reactions concerning acetylene and propargyl radical. Laser-induced fluorescence (LIF) and laser-induced incandescence (LII) techniques were used to measure the relative concentration of soot and PAHs, respectively. Two-dimensional images of the OH-LIF, PAHs-LIF, and LII from soot were measured in the test flames. Furthermore, to investigate the growth characteristics of the PAHs in the flames, the fluorescence spectra of the PAHs were measured at several heights in the flames, using a spectrograph. The molecular size of the PAHs was estimated based on an emission wavelength region of the PAHs-LIF that varied along with the PAH size. The results show that although the PAHs were widely distributed within the unburned region similar to that of the methane and propane flames, the intensity and detection region of LII were much smaller than that of the methane and propane flames. The PAHs-LIF spectra indicated that the growth of the PAHs within the DME flame was much slower than the methane and propane flames, and thus a large number of small PAHs were discharged into the OH region distributed around the outer edge of the flame. (C) 2010 Elsevier Ltd. All rights reserved.