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Chemical characterization of waste fuel for fluidized bed combustion
University of Borås, School of Engineering.
University of Borås, School of Engineering.
2009 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Combustible waste is very heterogeneous and the variation in chemical composition is of great significance for the performance of the combustors in terms of boiler availability and power efficiency. For example, the content of alkali, Chlorine and sulfur affect agglomeration, fouling and corrosion mechanisms, which often limits the steam data and requires counteracts such as soot blowing and outages. An increased knowledge on favorable levels and ratios of fuel components are therefore highly important when developing waste combustors, both existing and future. However, to be able to make good predictions of reactions, reliable fuel analyses are a necessity and they are difficult to perform because of the heterogeneity of waste. As a consequence, it is also difficult to complete pro-active measure to reduce unwanted reactions. This work has investigated the composition of the fuel during one year in a 40 MW commercial BFB waste plant. Twelve samples have been performed in order to estimate the variation of key components. The fuel samples were analyzed chemically for alkali and several other components of interest, such as Cl and S. Moreover, thermo-chemical multi-phase equilibrium calculations were performed for prediction of the chemical composition of the furnace in the temperature range 400-1000 ºC. In this temperature range NaCl and PbClx are formed as well as gas phase HCl and solid silicates. Furthermore, the calculations show that the chemistry is very sensitive to the input chemical composition, suggesting that already a minor shift in fuel mineral matter may change the behavior of the fuel radically in terms of its fouling and corrosion tendency.

Place, publisher, year, edition, pages
The 20th International Conference on Fluidized Combustion , 2009.
Keywords [en]
BFB, waste combustion, chemical characterisation, thermodynamic aquilibrium calculations
Keywords [sv]
Energi och material
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:hb:diva-6161Local ID: 2320/5214ISBN: 978-7-302-20146-5 (print)OAI: oai:DiVA.org:hb-6161DiVA, id: diva2:886845
Conference
The 20th International Conference on Fluidized Combustion , 2009.
Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2017-02-16Bibliographically approved

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Claesson, FridaElled, Anna-Lena

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf