Chemical Effects of CO2 Concentration on Soot Formation in Jet-stirred/Plug-flow Reactor

doi:10.1016/S1004-9541(13)60624-2

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (11): 1269-1283.DOI: 10.1016/S1004-9541(13)60624-2

• 催化、动力学与反应工程 • 上一篇下一篇

Chemical Effects of CO₂ Concentration on Soot Formation in Jet-stirred/Plug-flow Reactor

张引弟^1,2, 娄春², 刘德华¹, 李勇³, 阮龙飞¹

1 Yangtze University Research for China National Petroleum Corporation Key Laboratory of Oil Gas Production, Yangtze University, Wuhan 430100, China;
2 State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;
3 Gas Lift Technology Center of Tuha Oilfield of China National Petroleum Corporation, Hami 838202, China

收稿日期:2012-10-28 修回日期:2013-05-08 出版日期:2013-11-28 发布日期:2013-11-26
通讯作者: ZHANG Yindi
基金资助:
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).

Chemical Effects of CO₂ Concentration on Soot Formation in Jet-stirred/Plug-flow Reactor

ZHANG Yindi^1,2, LOU Chun², LIU Dehua¹, LI Yong³, RUAN Longfei¹

1 Yangtze University Research for China National Petroleum Corporation Key Laboratory of Oil Gas Production, Yangtze University, Wuhan 430100, China;
2 State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;
3 Gas Lift Technology Center of Tuha Oilfield of China National Petroleum Corporation, Hami 838202, China

Received:2012-10-28 Revised:2013-05-08 Online:2013-11-28 Published:2013-11-26
Contact: ZHANG Yindi
Supported by:
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).

摘要/Abstract

摘要： Soot formation was investigated numerically with CO₂ addition in a jet-stirred/plug-flow reactor (JSR/PFR) C₂H₄/O₂/N₂ reactor (C/O ratio of 2.2) at atmospheric pressure. An updated Kazakov mechanism emphasizes 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 + H1269CO + 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 + O₂1269O + 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 C₁₆H₁₀, 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 C₁₀ hydrocarbon intermediates. The sensitivity analysis and reaction-path analysis results show that C₂H₄ reaction path and products are altered due to the CO₂ addition.

关键词: fuel enrichment, carbon dioxide, kinetics modeling, soot formation, jet-stirred/plug-flow reactor

Abstract: Soot formation was investigated numerically with CO₂ addition in a jet-stirred/plug-flow reactor (JSR/PFR) C₂H₄/O₂/N₂ reactor (C/O ratio of 2.2) at atmospheric pressure. An updated Kazakov mechanism emphasizes 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 + H1269CO + 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 + O₂1269O + 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 C₁₆H₁₀, 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 C₁₀ hydrocarbon intermediates. The sensitivity analysis and reaction-path analysis results show that C₂H₄ reaction path and products are altered due to the CO₂ addition.

Key words: fuel enrichment, carbon dioxide, kinetics modeling, soot formation, jet-stirred/plug-flow reactor

张引弟, 娄春, 刘德华, 李勇, 阮龙飞. Chemical Effects of CO₂ Concentration on Soot Formation in Jet-stirred/Plug-flow Reactor[J]. Chinese Journal of Chemical Engineering, 2013, 21(11): 1269-1283.

ZHANG Yindi, LOU Chun, LIU Dehua, LI Yong, RUAN Longfei. Chemical Effects of CO₂ Concentration on Soot Formation in Jet-stirred/Plug-flow Reactor[J]. Chin.J.Chem.Eng., 2013, 21(11): 1269-1283.

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Chemical Effects of CO₂ Concentration on Soot Formation in Jet-stirred/Plug-flow Reactor

Chemical Effects of CO₂ Concentration on Soot Formation in Jet-stirred/Plug-flow Reactor

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