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Real-time In-Situ Detection of Potassium Release during Combustion of Pelletized Biomass using Tunable Diode Laser Absorption Spectroscopy
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (TEC-Lab)
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2014 (English)In: Impacts of Fuel Quality on Power Production October 26 –31, 2014, Snowbird, Utah, USA, 2014, 1-14 p.Conference paper, Published paper (Other academic)
Abstract [en]

Tunable diode laser absorption spectroscopy (TDLAS) was used for quantitative in-situ detection of gaseous elemental potassium (K) at distances 2-11 mm above biomass pellets combusted in a macro-thermogravimetric analyzer (macro-TGA). Single pellets of energy wood (EW) and wheat straw (WS) were converted in air at a furnace temperature of 850 °C and a carrier flow rate of 15 liters per minute. A second TDLAS system measured water vapor concentration and temperature above the pellets. In addition, semi-time-resolved K release data was obtained from conventional ICP-MS/AES analysis of fuel/ash residues collected at several occasions during devolatilization and char combustion. It was found that the fuels differ with respect to relative K-release and temporal release histories. Significant concentrations of K(g) were detected with TDLAS above the pellets during devolatilization, but no K(g) was observed during char combustion, independent of the fuel type. The amount of K(g)tot measured above the pellets during devolatilization was larger for EW than for WS, even though the total K content of WS was a factor of 60 higher. By combining TDLAS and ICP data, and supported by equilibrium calculations, these results indicate that, during devocalization, K is mainly released as KCl from wheat straw, whereas both KCl and KOH are released from energy wood.

Place, publisher, year, edition, pages
2014. 1-14 p.
National Category
Chemical Process Engineering
Identifiers
URN: urn:nbn:se:umu:diva-95732OAI: oai:DiVA.org:umu-95732DiVA: diva2:760828
Conference
Impacts of Fuel Quality on Power Production October 26 –31, 2014 Snowbird Resort & Conference Center Snowbird, Utah
Available from: 2014-11-04 Created: 2014-11-04 Last updated: 2017-12-11Bibliographically approved

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Qu, ZhechaoFagerström, JonathanSteinvall, ErikBroström, MarkusBoman, ChristofferFlorian, Schmidt
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CiteExportLink to record
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Citation style
  • apa
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