摘要
Soot formation was investigated numerically with CO2 addition in a jet-stirred/plug-flow reactor （JSR/PFR） C2H4/OJN2 reactor （C/O ratio of 2.2） at atmospheric pressure. An updated Kazakov mechanism empha- sizes the effect of the O2/CO2 atmosphere instead of an O2/N2 one in the premixed flame. The soot formation was taken into account in the JSR/PFR for C2H4/O2/N2. The effects of CO2 addition on soot formation in different C2H4/O2/CO2/N2 atmospheres were studied, with special emphasis on the chemical effect. The simulation shows that the endothermic reaction CO2 ＋ H - CO ＋ OH is responsible of the reduction of hydrocarbon intermediates in the CO2 added combustion through the supplementary formation of hydroxyl radicals. The competition of CO2 for H radical through the above forward reaction with the single most important chain branching reaction H ＋ O2, ＇ O ＋ OH reduces significantly the fuel burning rate. The chemical effects of CO2 cause a significant increase in residence time and mole fractions of CO and OH, significant decreases in some intermediates （H, C2H2）, polycyclic aromatic hydrocarbons （PAHs, C6H6 and CI6H10, etc.） and soot volume fraction. The CO2 addition will leads to a decrease by only about 5% to 20% of the maximum mole fractions of some C3 to Clo hydrocarbon intermediates. The sensitivity analysis and reaction-path analysis results show that C2H4 reaction path and products are altered due to the CO2 addition.
煤烟形成在一个 jet-stirred/plug-flow 反应堆(JSR/PFR ) 与 CO2 增加数字地被调查在气压的 C2H4/O2/N2 反应堆(2.2 的 C/O 比率) 。更新的 Kazakov 机制在 premixed 火焰强调 O2/CO2 空气的效果而不是 O2/N2。煤烟形成为 C2H4/O2/N2 在 JSR/PFR 被考虑。在不同 C2H4/O2/CO2/N2 气氛的煤烟形成上的 CO2 增加的效果被学习，与化学效果上的特殊强调。模拟表演吸热的反应 CO2 +HCO + 哦在 CO2 的烃中介的减小是负责的通过氢氧根激进分子的增补形成的增加的燃烧。为通过有最最重要的链的上述前面的反应的 H 基的 CO2 的比赛分叉的反应 H +O2O + 哦显著地减少燃烧的燃料率。CO2 的化学效果在住处时间和公司的鼹鼠部分引起重要增加并且哦，在一些中介的重要减少(H， C2H2 ) ，多不的芳香的烃(哼， C6H6 和 C16H10，等等) 并且煤烟体积部分。CO2 增加愿望在一些 C3 的仅仅大约 5% ～ 20% 最大的鼹鼠部分导致减少到 C10 烃中介。敏感分析和反应路径分析结果证明那条 C2H4 反应路径和产品由于 CO2 增加被改变。
基金
Supported by the Foundation of State Key Laboratory of Coal Combustion, the National Natural Science Foundation of China （51306022, 51176059） and the Natural Science Foundation of Hubei Province （2013CFB398）.
