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A Numerical Study on the Effect of Water Addition on NO Formation in Counterflow CH4/Air Premixed Flames

[+] Author and Article Information
Hongsheng Guo1

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

W. Stuart Neill, Gregory J. Smallwood

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

1

Corresponding author.

J. Eng. Gas Turbines Power 130(5), 054502 (Jun 05, 2008) (4 pages) doi:10.1115/1.2432890 History: Received April 11, 2006; Revised September 05, 2006; Published June 05, 2008

The effect of water addition on NO formation in counterflow CH4 /air premixed flames was investigated by numerical simulation. Detailed chemistry and complex thermal and transport properties were employed. The results show that the addition of water to a flame suppresses the formation of NO primarily due to flame temperature drop. Among a lean, a stoichiometric, and a rich premixed flame, the effectiveness of water addition is most significant for the stoichiometric flame and least for the rich flame. The addition of water also reduces the formation of NO in a flame because of the chemical effect. Compared to the stoichiometric flame, the chemical effect is intensified in the lean and rich flames.

FIGURES IN THIS ARTICLE
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Copyright © 2008 by American Society of Mechanical Engineers
Topics: Flames , Water , Temperature
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References

Figures

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Figure 1

Variation of the maximum flame temperature drop

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Figure 2

Variation of normalized NO emission index

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Figure 3

Total NO formation and destruction rates

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Figure 4

Total molecular nitrogen consumption rate from different routes

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Figure 5

Chemical effect of water addition on radicals OH, O, and H

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Figure 6

Chemical effect of water addition on radical CH in the rich flame

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