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首页> 外文会议>International Symposium on Combustion; 20060805-11; University of Heidelberg(DE) >Similarities and dissimilarities in n-hexane and benzene sooting premixed flames
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Similarities and dissimilarities in n-hexane and benzene sooting premixed flames

机译：正己烷和苯吹灰预混火焰中的异同

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摘要

The flame structure of atmospheric-pressure sooting premixed flames of aliphatic and aromatic hydrocarbons with the same carbon atom number (hexane and benzene) were studied at similar temperatures and C/O ratios by sampling and chemical and spectroscopic analysis. The differences in the oxidation mechanism of hexane and benzene in fuel-rich conditions were found to produce a different chemical environment in the yield of light hydrocarbons and their relative compositions where soot inception occurs. The predominance of acetylene and simple aromatic reactants in the oxidation region of the benzene flame favoured the early appearance and steep rise of soot particles. Large formations of saturated and unsatu-rated hydrocarbons were observed in the main oxidation region of the hexane flame whereas a delayed formation of aromatics (mainly PAH) was observed at soot inception only after complete oxygen consumption. There are differences in soot inception mechanisms reflected by the soot structure from UV-vis spectral shapes and mass specific absorption coefficients. In the benzene flame, they appeared to be more ordered and aromatic with a narrower size of aromatic systems and/or more curved aromatic structures. By contrast, less ordering with a more complex aliphatic/aromatic structure and a larger variety of aromatic systems were found to characterize soot formed in the hexane flame.
机译：通过相似的温度和C / O比，通过取样，化学和光谱分析研究了具有相同碳原子数（己烷和苯）的脂肪族和芳香族碳氢化合物的常压烟灰预混火焰的火焰结构。发现在富含燃料的条件下己烷和苯的氧化机理的差异会在产生碳烟的轻烃及其相对组成的产率方面产生不同的化学环境。乙炔和简单的芳香族反应物在苯火焰的氧化区域占主导地位，有利于烟灰颗粒的早期出现和急剧上升。在己烷火焰的主要氧化区域中观察到大量饱和和未饱和烃的形成，而烟灰开始时仅在完全耗氧后才观察到芳烃（主要为PAH）的形成延迟。从UV-可见光谱形状和质量比吸收系数来看，由碳烟结构反映的碳烟吸收机理有所不同。在苯火焰中，它们看起来更有序，并且具有较窄的芳族体系和/或更弯曲的芳族结构。相比之下，发现具有较复杂的脂族/芳族结构和较广泛的芳族体系的较少排序是表征在己烷火焰中形成的烟灰的特征。

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