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Study on a laser probe measurement for precursors of nano-PM generated in combustion fields

激光探针测量燃烧场产生的纳米颗粒物前驱体的研究

基本信息

批准号：
18560190
负责人：
AMAGAI Kenji
金额：
$ 2.37万
依托单位：
Gunma University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560190/
关键词：
Combustion Flame Laser measurement Polycyclic aromatic hydrocarbon Spectroscopy Soot particle

项目摘要

Nano meter size particulate matter (nano-PM) and polycyclic aromatic hydrocarbons (PANS) have harmful effects for human health. Investigations of fundamental characteristic of formation behavior of PAHs in combustion process were required for the reduction of nano-PM emission. In this study, PAHs characteristics in diffusion flames of liquid and gas fuels were investigated using laser diagnostic and gas sampling methods. Methane (CH_4), propane (C_3H_8) and hexane (C_6H_<14>) were used as the test fuels. A laser induced fluorescence (LIF) method was used to obtain the spatial distributions of PAHs, which were precursor molecules of soot particles. Spatial distributions of soot were also measured by a laser induced incandescence (LII) method. A transition region from PAHS to soot was discussed from the results of LIF and LIL Further, PAH concentrations in the test flames were measured using a gas chromatography (GC). Profiles of PAHs concentrations of test flames were compared. As the results, it was found that the low carbon number fuels such as propane and methane are remained to some fuel at downstream part. And, these some fuels were changed to large PAHs at downstream part. Moreover, it was confirmed that relatively small PAHs species such as benzene and toluene existed in looting region, however, the larger PAHs such as fluorine and pyrene could not be observed in the sooting region.

纳米颗粒物（nano-PM）和多环芳烃（PANS）对人体健康有严重危害。研究燃烧过程中多环芳烃生成行为的基本特征是减少纳米颗粒物排放的必要条件。本文采用激光诊断和气体采样的方法研究了液体和气体燃料扩散火焰中多环芳烃的特性。以甲烷（CH_4）、丙烷（C_3H_8）和己烷（<14>C_6H_8）为试验燃料。采用激光诱导荧光（LIF）方法研究了煤烟颗粒的前体分子多环芳烃（PAHs）的空间分布。烟尘的空间分布也测量了激光诱导白炽（LII）的方法。从LIF和LIL的结果讨论了从多环芳烃到碳烟的过渡区域。此外，使用气相色谱法（GC）测量了测试火焰中的多环芳烃浓度。对测试火焰中多环芳烃浓度的分布进行了比较。结果表明，丙烷、甲烷等低碳数燃料在下游部分残留。并且，这些燃料在下游部分转化为大的PAHs。此外，还证实了燃烧区存在苯和甲苯等相对较小的多环芳烃物种，而未观察到氟和芘等较大的多环芳烃物种.