【作者】 杨玖重； 赵龙； 苑文浩； 齐飞； 李玉阳；

【Author】 Jiuzhong Yang;Long Zhao;Wenhao Yuan;Fei Qi;Yuyang Li;National Synchrotron Radiation Laboratory, University of Science and Technology of China;State Key Laboratory of Fire Science, University of Science and Technology of China;

【机构】 中国科学技术大学国家同步辐射实验室； 中国科学技术大学火灾科学国家重点实验室；

【摘要】 本文对六个燃烧当量比(0.75至2.0)条件下的低压层流预混苯火焰进行了研究,利用同步辐射真空紫外光电离质谱(SVUV-PIMS),对火焰中间产物,尤其是自由基和多环芳烃(PAH)进行了鉴别和定量分析。此外,在本组芳烃燃料燃烧反应动力学模型的基础上,本文修正了部分反应路径,增加了氧化机理,发展了苯的燃烧反应动力学模型,并对实验数据进行了验证。利用生成速率分析,对当量比0.75和2.0火焰中苯的分解路径、以及多环芳烃和小分子产物的生成路径进行了详细地分析。结果显示,小分子产物主要来源于苯氧基和苯醌的分解路径;苯、苯基和环戊二烯基是多环芳烃重要的前驱体;相对于其他支链芳烃,苯富燃火焰中苄基生成较少,多环芳烃产物较少。更多还原

【Abstract】 Chemical structures of six laminar premixed benzene/oxygen/argon flames with equivalence ratios from 0.75 to 2.0 were investigated at 30 Torr. Dozens of flame species, especially radicals and large aromatics, were qualitatively identified and quantitatively measured using synchrotron vacuum ultraviolet photoionization mass spectrometry(SVUV-PIMS). A kinetic model was developed from our previous models of aromatic fuels to simulate the decomposition of benzene and formation of large aromatics, and was validated against the measured mole fraction profiles of flame species. Based on the rate of production analysis in the leanest and richest flames, the decomposition processes of benzene and the fate of C6 and smaller products were discussed in detail. Benzene, phenyl radical and cyclopentadienyl radical are concluded as key precursors of large aromatics, and the low formation of PAHs in rich benzene flames compared with rich alkylbenzene flames mainly derives from the low production of benzyl radical.更多还原