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

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

doi:10.1016/j.proci.2004.08.177

The effect of hydrogen addition on flammability limit and NO_x emission in ultra-lean counterflow CH₄/air premixed flames

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

Research output: Contribution to journal › Conference article › peer-review

211 Scopus citations

Abstract

The effect of hydrogen addition to ultra lean counterflow CH₄/air premixed flames on the extinction limits and the characteristics of NO_x 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.

Original language	English (US)
Pages (from-to)	303-311
Number of pages	9
Journal	Proceedings of the Combustion Institute
Volume	30
Issue number	1
DOIs	https://doi.org/10.1016/j.proci.2004.08.177
State	Published - 2005
Event	30th International Symposium on Combustion - Chicago, IL, United States Duration: Jul 25 2004 → Jul 30 2004

All Science Journal Classification (ASJC) codes

General Chemical Engineering
Mechanical Engineering
Physical and Theoretical Chemistry

Keywords

Extinction limit
Hydrogen enrichment
NO
Ultra-lean premixed flame

Access to Document

10.1016/j.proci.2004.08.177

Cite this

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title = "The effect of hydrogen addition on flammability limit and NOx emission in ultra-lean counterflow CH4/air premixed flames",

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 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.",

keywords = "Extinction limit, Hydrogen enrichment, NO, Ultra-lean premixed flame",

author = "Hongsheng Guo and Smallwood, {Gregory J.} and Fengshan Liu and Yiguang Ju and G{\"u}lder, {{\"O}mer L.}",

note = "Publisher Copyright: {\textcopyright} 2004 Published by Elsevier Inc. on behalf of The Combustion Institute. All rights reserved.; 30th International Symposium on Combustion ; Conference date: 25-07-2004 Through 30-07-2004",

year = "2005",

doi = "10.1016/j.proci.2004.08.177",

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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.

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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