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Online Alkali Measurement during Oxy-fuel Combustion

Leffler, Tomas LU ; Brackmann, Christian LU ; Berg, Magnus; Aldén, Marcus LU and Li, Zhongshan LU (2017) In Energy Procedia 120. p.365-372
Abstract

Coal has been the main fuel in the generation of heat and power for many years and will continue to be so for years to come. Global warming awareness has led to the Kyoto Protocol, which targets the abatement of six greenhouse gases, including carbon dioxide (CO2). For the abatement of CO2 emissions, co-combustion of coal and biomass is an attractive solution. Other mitigation solutions include oxy-fuel combustion followed by Carbon Capture and Storage (CCS). However, co-combustion with coal and biomass in oxy-fuel atmosphere has been found to be conducive to chlorine-induced corrosion, slagging and fouling due to the use of complex fuel mixtures rich in alkali metals and chlorine. In order to address problems such... (More)

Coal has been the main fuel in the generation of heat and power for many years and will continue to be so for years to come. Global warming awareness has led to the Kyoto Protocol, which targets the abatement of six greenhouse gases, including carbon dioxide (CO2). For the abatement of CO2 emissions, co-combustion of coal and biomass is an attractive solution. Other mitigation solutions include oxy-fuel combustion followed by Carbon Capture and Storage (CCS). However, co-combustion with coal and biomass in oxy-fuel atmosphere has been found to be conducive to chlorine-induced corrosion, slagging and fouling due to the use of complex fuel mixtures rich in alkali metals and chlorine. In order to address problems such as high-temperature corrosion, slagging and fouling caused by the use of these types of fuel mixtures, an alkali-measuring device is needed. The In-situ Alkali Chloride Monitor (IACM) utilizes UV light and Differential Optical Absorption Spectroscopy to measure gas-phase potassium chloride (KCl). This device has been successfully employed during biomass (wood chips and demolition wood) combustion and waste incineration. To investigate its performance in oxy-fuel combustion, the instrument was mounted on a 100 kW oxy-fuel combustion test unit equipped with a propane burner and a system for seeding of aqueous potassium chloride solution. The unit was operated in air- and oxy-fuel mode and the experiments substantiated the feasibility of online monitoring of gas-phase KCl in the flue gas during oxy-fuel combustion. The employment of an online alkali monitoring device during oxy-fuel combustion has the potential to increase the understanding of the release and capture of alkali chlorides, which in turn opens up for mitigation methods to reduce high temperature corrosion, slagging and fouling. This is a cost-efficient, sustainable solution because it extends the operational time of the boiler, reducing related maintenance costs.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Alkali metals, Co-combustion, High-temperature corrosion, IACM, Oxy-fuel
in
Energy Procedia
volume
120
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85029744836
ISSN
1876-6102
DOI
10.1016/j.egypro.2017.07.217
language
English
LU publication?
yes
id
bc6fb348-c681-49b7-b90a-7217468a2c4b
date added to LUP
2017-10-09 14:33:30
date last changed
2018-01-07 12:21:29
@article{bc6fb348-c681-49b7-b90a-7217468a2c4b,
  abstract     = {<p>Coal has been the main fuel in the generation of heat and power for many years and will continue to be so for years to come. Global warming awareness has led to the Kyoto Protocol, which targets the abatement of six greenhouse gases, including carbon dioxide (CO<sub>2</sub>). For the abatement of CO<sub>2</sub> emissions, co-combustion of coal and biomass is an attractive solution. Other mitigation solutions include oxy-fuel combustion followed by Carbon Capture and Storage (CCS). However, co-combustion with coal and biomass in oxy-fuel atmosphere has been found to be conducive to chlorine-induced corrosion, slagging and fouling due to the use of complex fuel mixtures rich in alkali metals and chlorine. In order to address problems such as high-temperature corrosion, slagging and fouling caused by the use of these types of fuel mixtures, an alkali-measuring device is needed. The In-situ Alkali Chloride Monitor (IACM) utilizes UV light and Differential Optical Absorption Spectroscopy to measure gas-phase potassium chloride (KCl). This device has been successfully employed during biomass (wood chips and demolition wood) combustion and waste incineration. To investigate its performance in oxy-fuel combustion, the instrument was mounted on a 100 kW oxy-fuel combustion test unit equipped with a propane burner and a system for seeding of aqueous potassium chloride solution. The unit was operated in air- and oxy-fuel mode and the experiments substantiated the feasibility of online monitoring of gas-phase KCl in the flue gas during oxy-fuel combustion. The employment of an online alkali monitoring device during oxy-fuel combustion has the potential to increase the understanding of the release and capture of alkali chlorides, which in turn opens up for mitigation methods to reduce high temperature corrosion, slagging and fouling. This is a cost-efficient, sustainable solution because it extends the operational time of the boiler, reducing related maintenance costs.</p>},
  author       = {Leffler, Tomas and Brackmann, Christian and Berg, Magnus and Aldén, Marcus and Li, Zhongshan},
  issn         = {1876-6102},
  keyword      = {Alkali metals,Co-combustion,High-temperature corrosion,IACM,Oxy-fuel},
  language     = {eng},
  pages        = {365--372},
  publisher    = {Elsevier},
  series       = {Energy Procedia},
  title        = {Online Alkali Measurement during Oxy-fuel Combustion},
  url          = {http://dx.doi.org/10.1016/j.egypro.2017.07.217},
  volume       = {120},
  year         = {2017},
}