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Effects of carbon dioxide addition to fuel on soot evolution in ethylene and propane diffusion flames

Wu, Jian LU ; Chen, Linghong; Bengtsson, Per Erik LU ; Zhou, Jianwu; Zhang, Jianfu; Wu, Xuecheng and Cen, Kefa (2019) In Combustion and Flame 199. p.85-95
Abstract

The influence of carbon dioxide addition to the fuel on soot evolution in ethylene and propane diffusion flames was studied by optical diagnostics. The mole fraction of CO2 addition ranged from 0 to 0.5, while the flow rate of the fuel gas was kept constant for these two sets of flames. Spatial distributions of polycyclic aromatic hydrocarbons (PAHs), temperature, as well as volume fraction, primary particle size and number density of soot were observed by the methods of laser-induced fluorescence (LIF), ratio pyrometry and laser-induced incandescence (LII), respectively. It was found that the flame height decreased for ethylene flames while it was nearly constant for propane flames with increasing addition of CO2.... (More)

The influence of carbon dioxide addition to the fuel on soot evolution in ethylene and propane diffusion flames was studied by optical diagnostics. The mole fraction of CO2 addition ranged from 0 to 0.5, while the flow rate of the fuel gas was kept constant for these two sets of flames. Spatial distributions of polycyclic aromatic hydrocarbons (PAHs), temperature, as well as volume fraction, primary particle size and number density of soot were observed by the methods of laser-induced fluorescence (LIF), ratio pyrometry and laser-induced incandescence (LII), respectively. It was found that the flame height decreased for ethylene flames while it was nearly constant for propane flames with increasing addition of CO2. The measurements showed a temperature reduction in the lower part but an increase in the upper part in the ethylene-based flames. By contrast, a slight temperature decrease was observed in overall propane-based flames with the addition of CO2. Similar suppression effects were observed in the total soot/PAHs loading, percentage of carbon conversion to soot, and the total number of primary soot particles regardless of the fuel type. Comparison between the total loading of soot and PAHs indicated that addition of CO2 inhibited the conversion of PAHs to soot. The results also showed that the addition of CO2 in the fuel had a small effect on the specific growth rate of soot regardless of the fuel type. Relative changes of particle surface area could reasonably well explain the shift in the peak volume fraction from the wings to the centerline with the addition of CO2 to the ethylene flames.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Carbon dioxide, Ethylene, Optical diagnostics, Propane, Soot evolution
in
Combustion and Flame
volume
199
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85055486863
ISSN
0010-2180
DOI
10.1016/j.combustflame.2018.10.003
language
English
LU publication?
yes
id
e4dc78c5-5358-418c-bb83-f6439140a632
date added to LUP
2018-11-14 08:34:24
date last changed
2019-01-06 14:15:03
@article{e4dc78c5-5358-418c-bb83-f6439140a632,
  abstract     = {<p>The influence of carbon dioxide addition to the fuel on soot evolution in ethylene and propane diffusion flames was studied by optical diagnostics. The mole fraction of CO<sub>2</sub> addition ranged from 0 to 0.5, while the flow rate of the fuel gas was kept constant for these two sets of flames. Spatial distributions of polycyclic aromatic hydrocarbons (PAHs), temperature, as well as volume fraction, primary particle size and number density of soot were observed by the methods of laser-induced fluorescence (LIF), ratio pyrometry and laser-induced incandescence (LII), respectively. It was found that the flame height decreased for ethylene flames while it was nearly constant for propane flames with increasing addition of CO<sub>2</sub>. The measurements showed a temperature reduction in the lower part but an increase in the upper part in the ethylene-based flames. By contrast, a slight temperature decrease was observed in overall propane-based flames with the addition of CO<sub>2</sub>. Similar suppression effects were observed in the total soot/PAHs loading, percentage of carbon conversion to soot, and the total number of primary soot particles regardless of the fuel type. Comparison between the total loading of soot and PAHs indicated that addition of CO<sub>2</sub> inhibited the conversion of PAHs to soot. The results also showed that the addition of CO<sub>2</sub> in the fuel had a small effect on the specific growth rate of soot regardless of the fuel type. Relative changes of particle surface area could reasonably well explain the shift in the peak volume fraction from the wings to the centerline with the addition of CO<sub>2</sub> to the ethylene flames.</p>},
  author       = {Wu, Jian and Chen, Linghong and Bengtsson, Per Erik and Zhou, Jianwu and Zhang, Jianfu and Wu, Xuecheng and Cen, Kefa},
  issn         = {0010-2180},
  keyword      = {Carbon dioxide,Ethylene,Optical diagnostics,Propane,Soot evolution},
  language     = {eng},
  pages        = {85--95},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {Effects of carbon dioxide addition to fuel on soot evolution in ethylene and propane diffusion flames},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2018.10.003},
  volume       = {199},
  year         = {2019},
}