Umeå University's logo

umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
Thermodynamic Equilibrium Study on the Melting Tendency of the K-Ca-Mg-P-Si-O System with Relevance to Woody and Agricultural Biomass Ash Compositions
Energy Engineering, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå, Sweden.
Energy Engineering, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. BEST-Bioenergy and Sustainable Technologies GmbH, Inffeldgasse 21b, Graz, Austria; Institute of Chemical, Environmental & Bioscience Engineering, TU Vienna, Vienna, Austria.ORCID iD: 0000-0002-5777-9241
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Show others and affiliations
2022 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 36, no 13, p. 7035-7051Article in journal (Refereed) Published
Abstract [en]

A major challenge in the combustion of biomass fuels is the heterogeneity of ash-forming elements, which may cause a wide range of ash-related problems. Understanding the melting tendency of the coarse ash fractions is necessary to mitigate agglomeration and slagging. This work aims to evaluate the melting tendency of the K-Ca-Mg-Si-P-O system by use of thermodynamic equilibrium calculations. The formation of condensed phases were systematically assessed in a combustion atmosphere, varying temperatures, and composition. Compositional ranges were based on fuel ash data extracted from the Phyllis 2 database. The speciation and degree of polymerization of phosphates, silicates, and melts were evaluated and indicated a systematic variation in composition. The melt fraction was predicted as a function of temperature and composition. The melting tendency was modeled for three systems, i.e., a P-dominated, a Si-dominated, and a mixed Si-P system. Four ratios between K2O, CaO, MgO, SiO2, and P2O5 were found to have a large effect on the melting tendency of the ash mixtures: the ratio between network formers (SiO2, P2O5), K2O to total network modifiers, CaO to CaO + MgO, and the ratio of network formers to total ash oxides. This modeling approach showed qualitative agreement with ash-related issues seen in previous lab-scale experiments in bubbling fluidized bed and fixed bed combustion. Practical implications of the results are discussed from the perspective of fuel design with the aim of preventing ash-related problems. This study presents a novel method of applying thermodynamic equilibrium calculations for a broad range of compositions and shows potential for predicting ash-related issues related to the melting of coarse ash fractions.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2022. Vol. 36, no 13, p. 7035-7051
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:umu:diva-198618DOI: 10.1021/acs.energyfuels.2c00785ISI: 000819242300001Scopus ID: 2-s2.0-85135443894OAI: oai:DiVA.org:umu-198618DiVA, id: diva2:1689905
Available from: 2022-08-24 Created: 2022-08-24 Last updated: 2023-09-05Bibliographically approved

Open Access in DiVA

fulltext(3705 kB)185 downloads
File information
File name FULLTEXT01.pdfFile size 3705 kBChecksum SHA-512
916db10ecdd5e5c03bee01ade158380b5c0a6ff7aeacf73b8ba880a6f73583b12c29b977722ee7db3936ff8a99962d385ea19bce13389d8d1ef946b6e1b028c9
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Authority records

Skoglund, NilsBackman, Rainer

Search in DiVA

By author/editor
Skoglund, NilsBackman, Rainer
By organisation
Department of Applied Physics and Electronics
In the same journal
Energy & Fuels
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 186 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 257 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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