Advanced

Effects of Flame Temperature on PAHs and Soot Evolution in Partially Premixed and Diffusion Flames of a Diesel Surrogate

Liu, Haifeng ; Cui, Yanqing ; Chen, Beiling ; Kyritsis, Dimitrios C. ; Tang, Qinglong ; Feng, Lei ; Wang, Yu ; Li, Zhongshan LU ; Geng, Chao and Yao, Mingfa (2019) In Energy and Fuels 33(11). p.11821-11829
Abstract

In this paper, polycyclic aromatic hydrocarbons (PAHs) and soot formation in rich partially premixed flames and nonpremixed flames were studied using a blend of n-heptane and toluene. The flames were diluted with Ar, N2, and CO2 to control the flame temperature. Laser-induced fluorescence, laser-induced incandescence, and two-color pyrometry were used to study the effects of flame temperature on the PAHs and soot evolution. Results show that temperature distributions are similar for different gas dilutions at low flow rates. However, the higherature area increases dramatically in size at high flow rates and it depends on diluents in the order Ar > N2 > CO2 with regard to flame... (More)

In this paper, polycyclic aromatic hydrocarbons (PAHs) and soot formation in rich partially premixed flames and nonpremixed flames were studied using a blend of n-heptane and toluene. The flames were diluted with Ar, N2, and CO2 to control the flame temperature. Laser-induced fluorescence, laser-induced incandescence, and two-color pyrometry were used to study the effects of flame temperature on the PAHs and soot evolution. Results show that temperature distributions are similar for different gas dilutions at low flow rates. However, the higherature area increases dramatically in size at high flow rates and it depends on diluents in the order Ar > N2 > CO2 with regard to flame temperature. With an increase in the flow rate of Ar, the higher growth rate of flame temperature and bigger region of higherature region can lead to a higher growth rate from small to large PAHs and higher soot volume fraction. However, for CO2 dilution, the increased flow rate results in the increase of formation of large PAHs, but soot formation is reduced due to the fact that lower flame temperature suppresses the soot formation. Therefore, it can be concluded that the evolution of PAHs and soot strongly depends on flame temperature.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Energy and Fuels
volume
33
issue
11
pages
11821 - 11829
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85074249041
ISSN
0887-0624
DOI
10.1021/acs.energyfuels.9b02315
language
English
LU publication?
yes
id
3ad23394-4562-463d-a8af-9d54aa340e07
date added to LUP
2019-11-21 13:26:53
date last changed
2020-08-12 08:56:42
@article{3ad23394-4562-463d-a8af-9d54aa340e07,
  abstract     = {<p>In this paper, polycyclic aromatic hydrocarbons (PAHs) and soot formation in rich partially premixed flames and nonpremixed flames were studied using a blend of n-heptane and toluene. The flames were diluted with Ar, N<sub>2</sub>, and CO<sub>2</sub> to control the flame temperature. Laser-induced fluorescence, laser-induced incandescence, and two-color pyrometry were used to study the effects of flame temperature on the PAHs and soot evolution. Results show that temperature distributions are similar for different gas dilutions at low flow rates. However, the higherature area increases dramatically in size at high flow rates and it depends on diluents in the order Ar &gt; N<sub>2</sub> &gt; CO<sub>2</sub> with regard to flame temperature. With an increase in the flow rate of Ar, the higher growth rate of flame temperature and bigger region of higherature region can lead to a higher growth rate from small to large PAHs and higher soot volume fraction. However, for CO<sub>2</sub> dilution, the increased flow rate results in the increase of formation of large PAHs, but soot formation is reduced due to the fact that lower flame temperature suppresses the soot formation. Therefore, it can be concluded that the evolution of PAHs and soot strongly depends on flame temperature.</p>},
  author       = {Liu, Haifeng and Cui, Yanqing and Chen, Beiling and Kyritsis, Dimitrios C. and Tang, Qinglong and Feng, Lei and Wang, Yu and Li, Zhongshan and Geng, Chao and Yao, Mingfa},
  issn         = {0887-0624},
  language     = {eng},
  month        = {11},
  number       = {11},
  pages        = {11821--11829},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Energy and Fuels},
  title        = {Effects of Flame Temperature on PAHs and Soot Evolution in Partially Premixed and Diffusion Flames of a Diesel Surrogate},
  url          = {http://dx.doi.org/10.1021/acs.energyfuels.9b02315},
  doi          = {10.1021/acs.energyfuels.9b02315},
  volume       = {33},
  year         = {2019},
}