Advanced

Effect of natural gas composition on the laminar burning velocities at elevated temperatures

Nilsson, Elna J.K. LU ; van Sprang, Astrid; Larfeldt, Jenny LU and Konnov, Alexander A. LU (2019) In Fuel 253. p.904-909
Abstract

Laminar burning velocities of fuel mixtures of methane/ethane/propane with the compositions 100/0/0, 80/20/0, 80/0/20 and 80/10/10 vol% burning with air were determined experimentally using the heat flux method at 1 atm and initial gas temperatures 298, 318 and 338 K. The mixtures were selected as surrogates for natural gas, with the aim to investigate the effect of heavier hydrocarbons on the laminar burning velocity of the main component, methane. It was found, in agreement with the literature data, that the heavier hydrocarbons increase laminar burning velocity compared to that of methane + air flames. A common correlation for the temperature dependence of the burning velocity S ... (More)

Laminar burning velocities of fuel mixtures of methane/ethane/propane with the compositions 100/0/0, 80/20/0, 80/0/20 and 80/10/10 vol% burning with air were determined experimentally using the heat flux method at 1 atm and initial gas temperatures 298, 318 and 338 K. The mixtures were selected as surrogates for natural gas, with the aim to investigate the effect of heavier hydrocarbons on the laminar burning velocity of the main component, methane. It was found, in agreement with the literature data, that the heavier hydrocarbons increase laminar burning velocity compared to that of methane + air flames. A common correlation for the temperature dependence of the burning velocity S L = S L0 (T/T 0 ) α , where T 0 is a reference temperature and S L0 is the laminar burning velocity at this temperature, was used to interpret new measurements. The power exponents, α, were derived from the experimental data for methane and three surrogates for natural gas. It was found that the temperature dependence of the burning velocities is practically identical for all mixtures studied. The measurements have been compared with the modelling using two kinetic schemes: recent version of the Aramco mech 2.0 and an updated version of a model developed by the authors. Both kinetic mechanisms show systematic trends in slight over- and under-prediction of the burning velocities, respectively, for all fuel blends. However, the temperature dependence of the burning velocities is accurately reproduced by these two models. Further analysis indicates that even though rate constants of the reactions determining flame propagation are somewhat different for the two mechanisms, the power exponents α are not sensitive to the differences. This indicates that, detailed kinetic schemes capable in predicting burning velocities at a specific initial mixture temperature are able to operate at higher temperatures as well, at least from lean to moderately rich natural gas mixtures.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Burning velocity, Methane, Natural gas, Temperature dependence
in
Fuel
volume
253
pages
6 pages
publisher
Elsevier
external identifiers
  • scopus:85065879137
ISSN
0016-2361
DOI
10.1016/j.fuel.2019.05.080
language
English
LU publication?
yes
id
3c28e761-bc14-4b09-a1c6-cac8322018d4
date added to LUP
2019-06-11 08:33:35
date last changed
2019-09-22 05:02:40
@article{3c28e761-bc14-4b09-a1c6-cac8322018d4,
  abstract     = {<p>                             Laminar burning velocities of fuel mixtures of methane/ethane/propane with the compositions 100/0/0, 80/20/0, 80/0/20 and 80/10/10 vol% burning with air were determined experimentally using the heat flux method at 1 atm and initial gas temperatures 298, 318 and 338 K. The mixtures were selected as surrogates for natural gas, with the aim to investigate the effect of heavier hydrocarbons on the laminar burning velocity of the main component, methane. It was found, in agreement with the literature data, that the heavier hydrocarbons increase laminar burning velocity compared to that of methane + air flames. A common correlation for the temperature dependence of the burning velocity S                             <sub>L</sub>                              = S                             <sub>L0</sub>                             (T/T                             <sub>0</sub>                             )                             <sup>α</sup>                             , where T                             <sub>0</sub>                              is a reference temperature and S                             <sub>L0</sub>                              is the laminar burning velocity at this temperature, was used to interpret new measurements. The power exponents, α, were derived from the experimental data for methane and three surrogates for natural gas. It was found that the temperature dependence of the burning velocities is practically identical for all mixtures studied. The measurements have been compared with the modelling using two kinetic schemes: recent version of the Aramco mech 2.0 and an updated version of a model developed by the authors. Both kinetic mechanisms show systematic trends in slight over- and under-prediction of the burning velocities, respectively, for all fuel blends. However, the temperature dependence of the burning velocities is accurately reproduced by these two models. Further analysis indicates that even though rate constants of the reactions determining flame propagation are somewhat different for the two mechanisms, the power exponents α are not sensitive to the differences. This indicates that, detailed kinetic schemes capable in predicting burning velocities at a specific initial mixture temperature are able to operate at higher temperatures as well, at least from lean to moderately rich natural gas mixtures.                         </p>},
  author       = {Nilsson, Elna J.K. and van Sprang, Astrid and Larfeldt, Jenny and Konnov, Alexander A.},
  issn         = {0016-2361},
  keyword      = {Burning velocity,Methane,Natural gas,Temperature dependence},
  language     = {eng},
  pages        = {904--909},
  publisher    = {Elsevier},
  series       = {Fuel},
  title        = {Effect of natural gas composition on the laminar burning velocities at elevated temperatures},
  url          = {http://dx.doi.org/10.1016/j.fuel.2019.05.080},
  volume       = {253},
  year         = {2019},
}