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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
Li, Xing1; Yang, Haolin; Jiang, Liqiao; Wang, Xiaohan; Zhao, Daiqing
2016-12-15
Source PublicationFUEL
Volume186Pages:648-655
AbstractThe 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results show that the flame temperature and the extinction strain rate are increased when the CO2 in the oxidizer has been replaced by H2O.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.
SubtypeArticle
KeywordCounterflow Non-premixed Flame High Temperature Oxidizer Co2 And H2o Concentrations Stretch Extinction Limit Flame Temperature
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.fuel.2016.09.017
WOS Subject ExtendedEnergy & Fuels ; Engineering
WOS KeywordOXY-STEAM COMBUSTION ; ELEVATED PRESSURES ; DIFFUSION FLAMES ; FLAMMABILITY LIMIT ; POWER-GENERATION ; FUEL COMBUSTION ; METHANE FLAMES ; CO2 ; IGNITION ; AIR
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China(51506204) ; Guangdong Natural Science Foundation(2016A030310125) ; National Basic Research Program of China(2014CB239601)
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000385318600066
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/13740
Collection中国科学院广州能源研究所
Affiliation1.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
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
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.
APA Li, Xing,Yang, Haolin,Jiang, Liqiao,Wang, Xiaohan,&Zhao, Daiqing.(2016).Stretch extinction characteristics of CH4/CO2 versus O-2/H2O/CO2 and O-2/H2O counterflow non-premixed flames at different oxidizer temperatures.FUEL,186,648-655.
MLA Li, Xing,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".FUEL 186(2016):648-655.
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