A numerical study on the influence of CO2 addition on soot formation in an ethylene/air diffusion flame

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DOIResolve DOI: http://doi.org/10.1080/00102200802258072
AuthorSearch for: ; Search for:
TypeArticle
Proceedings titleProceedings of the 21st International Colloquium on the Dynamics of Explosion and Reactive Systems (ICDERS)
Series titleCombustion Science and Technology; Volume 180
Conference21st International Colloquium on the Dynamics of Explosion and Reactive Systems (ICDERS):Poitiers, France, July 22-28, 2007
SubjectLaminar flame; Oxidation; Numerical simulation; Diffusion flame; Ethylene; Soot; Carbon dioxide; Numerical analysis
AbstractIt has been confirmed that the addition of CO2 to a diffusion flame suppresses the formation of soot. However, a consensus has not been reached regarding the mechanism of the suppression, especially the chemical effect. Some researchers claimed that the effect of CO2 addition on soot formation is primarily due to the thermal and dilution effects, while others argued that there is also noticeable chemical effect. Among the later group, some of them thought that the chemical effect is primarily caused by the enhanced soot oxidation process, while others believed that the chemical suppression is also a result of the reduced concentration of soot precursors and atomic hydrogen. Most previous studies on the effect of CO2 addition on soot formation were conducted by experiments. Although experiments can capture the natural phenomena, it is hard to separate the coupled effects of different mechanisms. Numerical simulation has an advantage to separate the different mechanisms. However, in the past, usually simplified soot models were employed, or soot was totally neglected in the simulation, because of the limit of computation power and the lack of detailed soot formation model. Significant progress has been made in the development of relatively detailed soot formation models. These models can capture many phenomena of soot formation in various flames. This paper further investigates the effect of CO2 addition on soot formation in a laminar diffusion flame by numerical simulation using a relatively detailed soot model. The purpose is to use the details from numerical results to identify if there is chemical effect and how the chemical effect suppresses soot formation, when CO2 is added to a laminar diffusion flame. The paper focuses on the fuel side addition, i.e. CO2 is added to the fuel stream.
Publication date
PublisherTaylor & Francis
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE); National Research Council Canada
Access conditionavailable
unlimited
public
Peer reviewedYes
NRC number51516
NPARC number3535847
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Record identifier3178acc2-5bb2-4283-84fe-64758bbfee39
Record created2009-08-18
Record modified2016-05-09
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