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A Numerical Study on the Effect of CO Addition on Flame Temperature and NO Formation in Counterflow CH4/Air Diffusion Flames

[+] Author and Article Information
Hongsheng Guo1

 Institute for Chemical Process and Environmental Technology, National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canadahongsheng.guo@nrc-cnrc.gc.ca

W. Stuart Neill

 Institute for Chemical Process and Environmental Technology, National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada

1

Corresponding author.

J. Eng. Gas Turbines Power 130(5), 054501 (May 30, 2008) (4 pages) doi:10.1115/1.2906222 History: Received January 02, 2008; Revised January 04, 2008; Published May 30, 2008

A numerical study was carried out to understand the effect of CO enrichment on flame temperature and NO formation in counterflow CH4/air diffusion flames. The results indicate that when CO is added to the fuel, both flame temperature and NO formation rate are changed due to the variations in adiabatic flame temperature, fuel Lewis number, and chemical reaction. At a low strain rate, the addition of carbon monoxide causes a monotonic decrease in flame temperature and peak NO concentration. However, NO emission index first slightly increases, and then decreases. At a moderate strain rate, the addition of CO has negligible effect on flame temperature and leads to a slight increase in both peak NO concentration and NO emission index, until the fraction of carbon monoxide reaches about 0.7. Then, with a further increase in the fraction of added carbon monoxide, all three quantities quickly decrease. At a high strain rate, the addition of carbon monoxide causes increase in flame temperature and NO formation rate, until a critical carbon monoxide fraction is reached. After the critical fraction, the further addition of carbon monoxide leads to decrease in both flame temperature and NO formation rate.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Variation of peak flame temperature

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Figure 2

Variation of peak NO mole fraction

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Figure 3

Variation of NO emission index

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Figure 4

NO formation pathway in CH4/air at a strain rate of 10s−1

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Figure 5

Distribution of NO formation rate

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Figure 6

Variation of peak CH concentration

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