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Stretch extinction characteristics of CH4/CO2 versus O-2/H2O/CO2 and O-2/H2O counterflow non-premixed flames at different oxidizer temperatures
作者: Li, Xing1; Yang, Haolin; Jiang, Liqiao; Wang, Xiaohan; Zhao, Daiqing
刊名: FUEL
出版日期: 2016-12-15
卷号: 186, 页码:648-655
关键词: Counterflow non-premixed flame ; High temperature oxidizer ; CO2 and H2O concentrations ; Stretch extinction limit ; Flame temperature
DOI: 10.1016/j.fuel.2016.09.017
文章类型: Article
英文摘要: The concentrations of CO2 and H2O in the combustion environment are important for the combustion characteristics of oxygen-enriched flames using hot oxidizers with large amount of CO2 and/or H2O. To understand the variations of flame temperature and stretch extinction limit of oxygen -enriched flames with H2O and CO2 concentrations, the CH4/CO2 versus O-2/H2O/CO2 and O-2/H2O counterflow non-premixed flames with the oxygen mole fraction of 0.35 were investigated numerically and compared with those of the CH4/CO2 versus O-2/CO2 (XO2 = 0.35) flames at the oxidizer temperatures of 500, 700 and 1000 K. Two O-2/H2O/CO2 mixtures with different H2O and CO2 concentrations were used as the oxidizers in the study. The results show that the flame temperature and the extinction strain rate are increased when the CO2 in the oxidizer has been replaced by H2O. The analysis based on the theoretical solution and computational result suggests that the total amount of OH radicals of the flame can be used as a criterion for the comparison of stretch extinction limit. The computational results show that the production rate of OH radicals via the reaction O + H2O = 2OH is comparable to that of H + O-2 = O + OH when H2O is added in the oxidizer. And the amount of OH radicals generated by O + H2O = 2OH increases with increasing H2O molar fraction of the oxidizer, resulting in a significant increase of the extinction strain rate. (C) 2016 Elsevier Ltd. All rights reserved.
WOS标题词: Science & Technology ; Technology
类目[WOS]: Energy & Fuels ; Engineering, Chemical
研究领域[WOS]: Energy & Fuels ; Engineering
关键词[WOS]: OXY-STEAM COMBUSTION ; ELEVATED PRESSURES ; DIFFUSION FLAMES ; FLAMMABILITY LIMIT ; POWER-GENERATION ; FUEL COMBUSTION ; METHANE FLAMES ; CO2 ; IGNITION ; AIR
收录类别: SCI
项目资助者: National Natural Science Foundation of China(51506204) ; Guangdong Natural Science Foundation(2016A030310125) ; National Basic Research Program of China(2014CB239601)
语种: 英语
WOS记录号: WOS:000385318600066
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.giec.ac.cn/handle/344007/13740
Appears in Collections:中国科学院广州能源研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Guangzhou Inst Energy Convers, 2 Nengyuan Rd, Guangzhou 510640, Guangdong, Peoples R China
2.Chinese Acad Sci, Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China

Recommended Citation:
Li, Xing,Yang, Haolin,Jiang, Liqiao,et al. Stretch extinction characteristics of CH4/CO2 versus O-2/H2O/CO2 and O-2/H2O counterflow non-premixed flames at different oxidizer temperatures[J]. FUEL,2016,186:648-655.
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