TY - JOUR
T1 - The effect of hydrogen addition on flammability limit and NOx emission in ultra-lean counterflow CH4/air premixed flames
AU - Guo, Hongsheng
AU - Smallwood, Gregory J.
AU - Liu, Fengshan
AU - Ju, Yiguang
AU - Gülder, Ömer L.
N1 - Publisher Copyright:
© 2004 Published by Elsevier Inc. on behalf of The Combustion Institute. All rights reserved.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2005
Y1 - 2005
N2 - The effect of hydrogen addition to ultra lean counterflow CH4/air premixed flames on the extinction limits and the characteristics of NOx emission was investigated by numerical simulation. Detailed chemistry and complex thermal and transport properties were employed. The results show that the addition of hydrogen can significantly enlarge the flammable region and extend the flammability limit to lower equivalence ratios. If the equivalence ratio is kept constant, the addition of hydrogen increases the emission of NO in a flame due to the enhancement in the rate of the NNH or N2O intermediate NO formation routes. The addition of hydrogen causes a monotonic decrease in the formation of NO2 and N2O, except flames near the extinction limits, where the emission of NO2 and N2O first increases, and then decreases with the increase in the fraction of hydrogen. Overall, hydrogen enrichment technology allows stable combustion under ultra lean conditions, resulting in significant CO2 and NO emission reduction.
AB - The effect of hydrogen addition to ultra lean counterflow CH4/air premixed flames on the extinction limits and the characteristics of NOx emission was investigated by numerical simulation. Detailed chemistry and complex thermal and transport properties were employed. The results show that the addition of hydrogen can significantly enlarge the flammable region and extend the flammability limit to lower equivalence ratios. If the equivalence ratio is kept constant, the addition of hydrogen increases the emission of NO in a flame due to the enhancement in the rate of the NNH or N2O intermediate NO formation routes. The addition of hydrogen causes a monotonic decrease in the formation of NO2 and N2O, except flames near the extinction limits, where the emission of NO2 and N2O first increases, and then decreases with the increase in the fraction of hydrogen. Overall, hydrogen enrichment technology allows stable combustion under ultra lean conditions, resulting in significant CO2 and NO emission reduction.
KW - Extinction limit
KW - Hydrogen enrichment
KW - NO
KW - Ultra-lean premixed flame
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U2 - 10.1016/j.proci.2004.08.177
DO - 10.1016/j.proci.2004.08.177
M3 - Conference article
AN - SCOPUS:84964267035
VL - 30
SP - 303
EP - 311
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
SN - 1540-7489
IS - 1
T2 - 30th International Symposium on Combustion
Y2 - 25 July 2004 through 30 July 2004
ER -