The effect of hydrogen addition on flammability limit and NOx emission in ultra lean coterflow CH4/air premixed flames

Hongsheng Guo, Gregory J. Smallwood, Fengshan Liu, Yiguang Ju, Ömer L. Gülder

Research output: Contribution to conferencePaper

Abstract

The effect of hydrogen addition to ultra lean counterflow CH4/air premixed flames on the extinction limits and the characteristics of NOx emission was studied by numerical simulation. Detailed chemistry and complex thermal and transport properties were employed. Hydrogen addition could significantly enlarge the flammable region and extend the flammability limit to lower equivalence ratios. If the equivalence ratio was kept constant, the addition of hydrogen increased 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 caused a monotonous decrease in the formation of NO2 and N2O, except flames near the extinction limits, where the emission of NO2 and N2O first increased, and then decreased with the increase in the fraction of hydrogen. Hydrogen enrichment technology allows stable combustion under ultra lean conditions, resulting in significant CO2 and NO emission reduction.

Original languageEnglish (US)
Number of pages1
StatePublished - Jan 1 2004
Event30th International Symposium on Combustion, Abstracts of Symposium Papers - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004

Other

Other30th International Symposium on Combustion, Abstracts of Symposium Papers
CountryUnited States
CityChicago, IL
Period7/25/047/30/04

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Guo, H., Smallwood, G. J., Liu, F., Ju, Y., & Gülder, Ö. L. (2004). The effect of hydrogen addition on flammability limit and NOx emission in ultra lean coterflow CH4/air premixed flames. Paper presented at 30th International Symposium on Combustion, Abstracts of Symposium Papers, Chicago, IL, United States.