Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Experimental and kinetic modeling study of the laminar burning velocity of CH4/H2 mixtures under oxy-fuel conditions

Hu, Xianzhong LU ; Chen, Jundie LU ; Lin, Qianjin LU and Konnov, Alexander A. LU (2024) In Fuel 376.
Abstract

The oxy-fuel combustion of coke oven gas generates CH4/H2/O2/CO2 mixtures, and this study focuses on measuring the laminar burning velocities of these mixtures which are rarely studied previously. The investigation encompasses a range of equivalence ratios from 0.6 to 1.5, O2/(O2 + CO2) ratios varying between 0.25 and 0.38, and H2/(H2 + CH4) ratios ranging from 0.25 to 0.6, under normal temperature and pressure conditions. Employing the experimental data, five established detailed kinetic mechanisms (Konnov 2023, AramcoMech 3.0, GRI 3.0, USC II, and San Diego) are evaluated, revealing that the Konnov 2023 mechanism exhibits the... (More)

The oxy-fuel combustion of coke oven gas generates CH4/H2/O2/CO2 mixtures, and this study focuses on measuring the laminar burning velocities of these mixtures which are rarely studied previously. The investigation encompasses a range of equivalence ratios from 0.6 to 1.5, O2/(O2 + CO2) ratios varying between 0.25 and 0.38, and H2/(H2 + CH4) ratios ranging from 0.25 to 0.6, under normal temperature and pressure conditions. Employing the experimental data, five established detailed kinetic mechanisms (Konnov 2023, AramcoMech 3.0, GRI 3.0, USC II, and San Diego) are evaluated, revealing that the Konnov 2023 mechanism exhibits the best performance in predicting the laminar burning velocities. Notably, the thermal effect of H2 demonstrates a small impact on laminar burning velocity, with the chemical effect being considerably more significant, since the addition of H2 directly increases concentrations of H, O, and OH, thereby accelerating the global reaction rates of both H2 and CH4 oxidation. Conversely, the thermal effect of CO2, attributable to its high specific heat, results in a reduction of the laminar burning velocity. Furthermore, the chemical effect of CO2 is found to be comparable to the thermal effect, primarily arising from the elementary reaction CO + OH <=> CO2 + H. It is noteworthy that the third-body reactions involving CO2 exhibits relatively small effects.

(Less)
Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CH, CO, H, Kinetic mechanisms, Laminar burning velocity, O, Oxy-fuel combustion
in
Fuel
volume
376
article number
132597
publisher
Elsevier
external identifiers
  • scopus:85200348202
ISSN
0016-2361
DOI
10.1016/j.fuel.2024.132597
language
English
LU publication?
yes
id
0eef2d78-253a-4cac-b9d7-48490bdd4f90
date added to LUP
2024-08-27 15:30:18
date last changed
2024-09-24 08:04:52
@article{0eef2d78-253a-4cac-b9d7-48490bdd4f90,
  abstract     = {{<p>The oxy-fuel combustion of coke oven gas generates CH<sub>4</sub>/H<sub>2</sub>/O<sub>2</sub>/CO<sub>2</sub> mixtures, and this study focuses on measuring the laminar burning velocities of these mixtures which are rarely studied previously. The investigation encompasses a range of equivalence ratios from 0.6 to 1.5, O<sub>2</sub>/(O<sub>2</sub> + CO<sub>2</sub>) ratios varying between 0.25 and 0.38, and H<sub>2</sub>/(H<sub>2</sub> + CH<sub>4</sub>) ratios ranging from 0.25 to 0.6, under normal temperature and pressure conditions. Employing the experimental data, five established detailed kinetic mechanisms (Konnov 2023, AramcoMech 3.0, GRI 3.0, USC II, and San Diego) are evaluated, revealing that the Konnov 2023 mechanism exhibits the best performance in predicting the laminar burning velocities. Notably, the thermal effect of H<sub>2</sub> demonstrates a small impact on laminar burning velocity, with the chemical effect being considerably more significant, since the addition of H<sub>2</sub> directly increases concentrations of H, O, and OH, thereby accelerating the global reaction rates of both H<sub>2</sub> and CH<sub>4</sub> oxidation. Conversely, the thermal effect of CO<sub>2</sub>, attributable to its high specific heat, results in a reduction of the laminar burning velocity. Furthermore, the chemical effect of CO<sub>2</sub> is found to be comparable to the thermal effect, primarily arising from the elementary reaction CO + OH &lt;=&gt; CO<sub>2</sub> + H. It is noteworthy that the third-body reactions involving CO<sub>2</sub> exhibits relatively small effects.</p>}},
  author       = {{Hu, Xianzhong and Chen, Jundie and Lin, Qianjin and Konnov, Alexander A.}},
  issn         = {{0016-2361}},
  keywords     = {{CH; CO; H; Kinetic mechanisms; Laminar burning velocity; O; Oxy-fuel combustion}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Fuel}},
  title        = {{Experimental and kinetic modeling study of the laminar burning velocity of CH<sub>4</sub>/H<sub>2</sub> mixtures under oxy-fuel conditions}},
  url          = {{http://dx.doi.org/10.1016/j.fuel.2024.132597}},
  doi          = {{10.1016/j.fuel.2024.132597}},
  volume       = {{376}},
  year         = {{2024}},
}