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K-Cl-S chemistry in air and oxy-combustion atmospheres

Ekvall, Thomas; Andersson, Klas; Leffler, Thomas LU and Berg, Magnus (2017) In Proceedings of the Combustion Institute2000-01-01+01:00 p.4011-4018
Abstract

This paper studies the consequences on high temperature corrosion when biomass is co-fired with coal in oxy-fuel combustion, a concept that would enable negative CO2 emissions by combining renewable fuels with CO2 capture. The particular focus of the work is the sulphation of alkali chlorides which is studied by means of experiments and modelling. The melting point of alkali sulphates is higher than for alkali chlorides and a high degree of alkali sulphation is hence a measure to reduce issues related to high-temperature corrosion. In the experiments a propane flame was doped with SO2 and KCl (in solution) in air and oxy-fuel atmospheres. Two alternative measurement principles were applied to quantify... (More)

This paper studies the consequences on high temperature corrosion when biomass is co-fired with coal in oxy-fuel combustion, a concept that would enable negative CO2 emissions by combining renewable fuels with CO2 capture. The particular focus of the work is the sulphation of alkali chlorides which is studied by means of experiments and modelling. The melting point of alkali sulphates is higher than for alkali chlorides and a high degree of alkali sulphation is hence a measure to reduce issues related to high-temperature corrosion. In the experiments a propane flame was doped with SO2 and KCl (in solution) in air and oxy-fuel atmospheres. Two alternative measurement principles were applied to quantify potassium sulphation and the paper thereby contributes with a novel experimental approach as well as unique experimental data for turbulent diffusion air and oxy-fuel flames. The degree of sulphation of the injected KCl increases substantially in oxy compared to air combustion conditions, a fact which favours the use of biomass in oxy-combustion. This is mainly due to the increased concentration of SO2 due to flue gas recycling in oxy-combustion, but also chemical effects introduced by the CO2 as well as a small effect resulting from an increased residence time in the combustor.

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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 metals, Co-combustion, High temperature corrosion, Oxy-fuel, Sulphur
in
Proceedings of the Combustion Institute2000-01-01+01:00
pages
4011 - 4018
publisher
Elsevier
external identifiers
  • scopus:84992178601
  • wos:000393412600076
ISSN
1540-7489
DOI
10.1016/j.proci.2016.08.069
language
English
LU publication?
yes
id
cfd07600-c18b-4e93-89dc-1308e03596eb
date added to LUP
2017-02-17 12:15:56
date last changed
2018-04-01 04:29:48
@article{cfd07600-c18b-4e93-89dc-1308e03596eb,
  abstract     = {<p>This paper studies the consequences on high temperature corrosion when biomass is co-fired with coal in oxy-fuel combustion, a concept that would enable negative CO<sub>2</sub> emissions by combining renewable fuels with CO<sub>2</sub> capture. The particular focus of the work is the sulphation of alkali chlorides which is studied by means of experiments and modelling. The melting point of alkali sulphates is higher than for alkali chlorides and a high degree of alkali sulphation is hence a measure to reduce issues related to high-temperature corrosion. In the experiments a propane flame was doped with SO<sub>2</sub> and KCl (in solution) in air and oxy-fuel atmospheres. Two alternative measurement principles were applied to quantify potassium sulphation and the paper thereby contributes with a novel experimental approach as well as unique experimental data for turbulent diffusion air and oxy-fuel flames. The degree of sulphation of the injected KCl increases substantially in oxy compared to air combustion conditions, a fact which favours the use of biomass in oxy-combustion. This is mainly due to the increased concentration of SO<sub>2</sub> due to flue gas recycling in oxy-combustion, but also chemical effects introduced by the CO<sub>2</sub> as well as a small effect resulting from an increased residence time in the combustor.</p>},
  author       = {Ekvall, Thomas and Andersson, Klas and Leffler, Thomas and Berg, Magnus},
  issn         = {1540-7489},
  keyword      = {Alkali metals,Co-combustion,High temperature corrosion,Oxy-fuel,Sulphur},
  language     = {eng},
  pages        = {4011--4018},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute2000-01-01+01:00},
  title        = {K-Cl-S chemistry in air and oxy-combustion atmospheres},
  url          = {http://dx.doi.org/10.1016/j.proci.2016.08.069},
  year         = {2017},
}