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Influence of potassium and iron chloride on the early stages of soot formation studied using imaging LII/ELS and TEM techniques

Simonsson, Johan LU ; Olofsson, Nils Erik LU ; Bladh, Henrik LU ; Sanati, Mehri LU and Bengtsson, Per Erik LU (2015) In Proceedings of the Combustion Institute
Abstract

Laser-induced incandescence (LII), elastic light scattering (ELS) and extinction were used to investigate the early stages of soot formation when seeding metal salts at various concentrations into a premixed ethylene/air flame on a PerkinElmer burner. The investigation contained seven salts, where we in this work mainly focus on two of these salts, potassium chloride (KCl) and iron chloride (FeCl3), as these for mature soot resulted in the largest reduction and highest increase in soot concentration, respectively. The optical measurements show that the potassium chloride significantly reduces the build-up of larger soot precursors and also decreases the sizes of the primary soot particles both at the nucleation stage as well... (More)

Laser-induced incandescence (LII), elastic light scattering (ELS) and extinction were used to investigate the early stages of soot formation when seeding metal salts at various concentrations into a premixed ethylene/air flame on a PerkinElmer burner. The investigation contained seven salts, where we in this work mainly focus on two of these salts, potassium chloride (KCl) and iron chloride (FeCl3), as these for mature soot resulted in the largest reduction and highest increase in soot concentration, respectively. The optical measurements show that the potassium chloride significantly reduces the build-up of larger soot precursors and also decreases the sizes of the primary soot particles both at the nucleation stage as well as for more mature soot later in the formation process. This is also confirmed by analysis of transmission electron microscopy (TEM) images, which clearly show smaller primary soot particles for the potassium chloride-seeded flame. The iron chloride-seeded flames were found to have marginal influence on the primary particle sizes based on the optical data, although somewhat more irregular shapes could be observed in TEM images.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Elastic light scattering, Extinction, Laser-induced incandescence, Potassium, Soot
in
Proceedings of the Combustion Institute
publisher
Elsevier
external identifiers
  • scopus:84979085015
ISSN
1540-7489
DOI
10.1016/j.proci.2016.07.003
language
English
LU publication?
yes
id
14d11415-f48a-43b2-97f8-456cd679f3d3
date added to LUP
2016-12-22 13:13:31
date last changed
2017-07-30 05:19:25
@article{14d11415-f48a-43b2-97f8-456cd679f3d3,
  abstract     = {<p>Laser-induced incandescence (LII), elastic light scattering (ELS) and extinction were used to investigate the early stages of soot formation when seeding metal salts at various concentrations into a premixed ethylene/air flame on a PerkinElmer burner. The investigation contained seven salts, where we in this work mainly focus on two of these salts, potassium chloride (KCl) and iron chloride (FeCl<sub>3</sub>), as these for mature soot resulted in the largest reduction and highest increase in soot concentration, respectively. The optical measurements show that the potassium chloride significantly reduces the build-up of larger soot precursors and also decreases the sizes of the primary soot particles both at the nucleation stage as well as for more mature soot later in the formation process. This is also confirmed by analysis of transmission electron microscopy (TEM) images, which clearly show smaller primary soot particles for the potassium chloride-seeded flame. The iron chloride-seeded flames were found to have marginal influence on the primary particle sizes based on the optical data, although somewhat more irregular shapes could be observed in TEM images.</p>},
  author       = {Simonsson, Johan and Olofsson, Nils Erik and Bladh, Henrik and Sanati, Mehri and Bengtsson, Per Erik},
  issn         = {1540-7489},
  keyword      = {Elastic light scattering,Extinction,Laser-induced incandescence,Potassium,Soot},
  language     = {eng},
  month        = {12},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute},
  title        = {Influence of potassium and iron chloride on the early stages of soot formation studied using imaging LII/ELS and TEM techniques},
  url          = {http://dx.doi.org/10.1016/j.proci.2016.07.003},
  year         = {2015},
}