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Effects of CH4 Content on NO Formation in One-Dimensional Adiabatic Flames Investigated by Saturated Laser-Induced Fluorescence and CHEMKIN Modeling

Zhou, Yajun ; Wang, Zhihua ; He, Yong ; Whiddon, Ronald LU ; Xu, Dongxiang ; Li, Zhongshan LU and Cen, Kefa (2017) In Energy and Fuels 31(3). p.3154-3163
Abstract

Experiments applying saturated laser-induced fluorescence (LSF) technology were performed focusing on the influence of equivalence ratio, syngas mixture contents, on NO formation in H2/CO/CH4/CO2/N2/O2 premixed flat flames supplied by a heat flux burner. Experimental data were extracted to validate calculation by CHEMKIN software. Both experiments and CHEMKIN calculation draw one conclusion that NO mole fraction in CH4-air flame peaks at stoichiometric and φ1.3, due to thermal NO and prompt NO routes. All mechanisms applied can well-predict the NO mole fraction at the fuel lean side but failed at the fuel rich side. NO mole fraction in syngas flame is propotional to... (More)

Experiments applying saturated laser-induced fluorescence (LSF) technology were performed focusing on the influence of equivalence ratio, syngas mixture contents, on NO formation in H2/CO/CH4/CO2/N2/O2 premixed flat flames supplied by a heat flux burner. Experimental data were extracted to validate calculation by CHEMKIN software. Both experiments and CHEMKIN calculation draw one conclusion that NO mole fraction in CH4-air flame peaks at stoichiometric and φ1.3, due to thermal NO and prompt NO routes. All mechanisms applied can well-predict the NO mole fraction at the fuel lean side but failed at the fuel rich side. NO mole fraction in syngas flame is propotional to CH4 ratio as shown in the experimental data, but all the mechanisms failed to predict it with some even having a wrong tendency. A rate of NO production and sensitivity analysis suggests that thermal and prompt NO routes play different roles in each mechanism, and modifications to mechanisms are required to improve NO concnetration predictions at CH4-containing syngas flame.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Energy and Fuels
volume
31
issue
3
pages
10 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000396970400111
  • scopus:85017362368
ISSN
0887-0624
DOI
10.1021/acs.energyfuels.6b02434
language
English
LU publication?
yes
id
91344905-701d-4435-b428-6781c493cdc7
date added to LUP
2017-05-03 08:49:32
date last changed
2025-01-07 12:19:12
@article{91344905-701d-4435-b428-6781c493cdc7,
  abstract     = {{<p>Experiments applying saturated laser-induced fluorescence (LSF) technology were performed focusing on the influence of equivalence ratio, syngas mixture contents, on NO formation in H<sub>2</sub>/CO/CH<sub>4</sub>/CO<sub>2</sub>/N<sub>2</sub>/O<sub>2</sub> premixed flat flames supplied by a heat flux burner. Experimental data were extracted to validate calculation by CHEMKIN software. Both experiments and CHEMKIN calculation draw one conclusion that NO mole fraction in CH<sub>4</sub>-air flame peaks at stoichiometric and φ1.3, due to thermal NO and prompt NO routes. All mechanisms applied can well-predict the NO mole fraction at the fuel lean side but failed at the fuel rich side. NO mole fraction in syngas flame is propotional to CH<sub>4</sub> ratio as shown in the experimental data, but all the mechanisms failed to predict it with some even having a wrong tendency. A rate of NO production and sensitivity analysis suggests that thermal and prompt NO routes play different roles in each mechanism, and modifications to mechanisms are required to improve NO concnetration predictions at CH<sub>4</sub>-containing syngas flame.</p>}},
  author       = {{Zhou, Yajun and Wang, Zhihua and He, Yong and Whiddon, Ronald and Xu, Dongxiang and Li, Zhongshan and Cen, Kefa}},
  issn         = {{0887-0624}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{3}},
  pages        = {{3154--3163}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Energy and Fuels}},
  title        = {{Effects of CH<sub>4</sub> Content on NO Formation in One-Dimensional Adiabatic Flames Investigated by Saturated Laser-Induced Fluorescence and CHEMKIN Modeling}},
  url          = {{http://dx.doi.org/10.1021/acs.energyfuels.6b02434}},
  doi          = {{10.1021/acs.energyfuels.6b02434}},
  volume       = {{31}},
  year         = {{2017}},
}