Advanced

Experimental investigations of potassium chemistry in premixed flames

Leffler, Tomas LU ; Brackmann, Christian LU ; Weng, Wubin LU ; Gao, Qiang LU ; Aldén, Marcus LU and Li, Zhongshan LU (2017) In Fuel 203. p.802-810
Abstract

Quantitative potassium species concentrations have been measured in alkali-seeded premixed methane-air flames of different stoichiometry. Potassium chloride (KCl) and hydroxide (KOH) were measured by broadband UV absorption spectroscopy and laser-induced photofragmentation fluorescence, while atomic potassium was measured using tuneable diode-laser spectroscopy. In addition, laser Rayleigh scattering was employed for temperature measurements. Investigations were made for different alkali-seeding levels and chlorine loads resulting in KCl/KOH concentrations up to ∼30 ppm and concentrations of K atoms at ppm levels. Experimental results were compared with predictions from a chemical mechanism used in a homogenous reactor model. The... (More)

Quantitative potassium species concentrations have been measured in alkali-seeded premixed methane-air flames of different stoichiometry. Potassium chloride (KCl) and hydroxide (KOH) were measured by broadband UV absorption spectroscopy and laser-induced photofragmentation fluorescence, while atomic potassium was measured using tuneable diode-laser spectroscopy. In addition, laser Rayleigh scattering was employed for temperature measurements. Investigations were made for different alkali-seeding levels and chlorine loads resulting in KCl/KOH concentrations up to ∼30 ppm and concentrations of K atoms at ppm levels. Experimental results were compared with predictions from a chemical mechanism used in a homogenous reactor model. The observed trends, decrease in KCl and KOH concentrations and increase in K-atom concentrations with flame equivalence ratio, were well reproduced in simulations and are compared with results reported in literature. In addition, possibilities using the experimental methods for further investigations of alkali-related combustion phenomena and detailed model validation of alkali chemistry are discussed.

(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
Alkali formation, Combustion, Optical diagnostics
in
Fuel
volume
203
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:85019464825
  • wos:000404084600081
ISSN
0016-2361
DOI
10.1016/j.fuel.2017.05.013
language
English
LU publication?
yes
id
dc169e99-ce04-44cf-8dc1-568aff64b10e
date added to LUP
2017-06-08 10:14:39
date last changed
2017-09-18 11:39:21
@article{dc169e99-ce04-44cf-8dc1-568aff64b10e,
  abstract     = {<p>Quantitative potassium species concentrations have been measured in alkali-seeded premixed methane-air flames of different stoichiometry. Potassium chloride (KCl) and hydroxide (KOH) were measured by broadband UV absorption spectroscopy and laser-induced photofragmentation fluorescence, while atomic potassium was measured using tuneable diode-laser spectroscopy. In addition, laser Rayleigh scattering was employed for temperature measurements. Investigations were made for different alkali-seeding levels and chlorine loads resulting in KCl/KOH concentrations up to ∼30 ppm and concentrations of K atoms at ppm levels. Experimental results were compared with predictions from a chemical mechanism used in a homogenous reactor model. The observed trends, decrease in KCl and KOH concentrations and increase in K-atom concentrations with flame equivalence ratio, were well reproduced in simulations and are compared with results reported in literature. In addition, possibilities using the experimental methods for further investigations of alkali-related combustion phenomena and detailed model validation of alkali chemistry are discussed.</p>},
  author       = {Leffler, Tomas and Brackmann, Christian and Weng, Wubin and Gao, Qiang and Aldén, Marcus and Li, Zhongshan},
  issn         = {0016-2361},
  keyword      = {Alkali formation,Combustion,Optical diagnostics},
  language     = {eng},
  month        = {09},
  pages        = {802--810},
  publisher    = {Elsevier},
  series       = {Fuel},
  title        = {Experimental investigations of potassium chemistry in premixed flames},
  url          = {http://dx.doi.org/10.1016/j.fuel.2017.05.013},
  volume       = {203},
  year         = {2017},
}