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
Effects of used bed materials on char gasification: Investigating the role of element migration using online alkali measurements
Department of Chemistry and Molecular Biology, Atmospheric Science, University of Gothenburg, SE-412 96 Gothenburg, Sweden.
Department of Chemical Engineering, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
Department of Chemistry and Molecular Biology, Atmospheric Science, University of Gothenburg, SE-412 96 Gothenburg, Sweden.
Department of Chemical Engineering, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
Show others and affiliations
2022 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 238, article id 107491Article in journal (Refereed) Published
Abstract [en]

Online alkali measurements using surface ionization are employed to study alkali release during heating of used industrial fluidized bed materials and gasification of biomass-based char and bed material mixtures. The alkali release from the bed materials starts at 820 °C and increases with temperature, the time a bed material has experienced in an industrial process, and in the presence of CO2. Online alkali measurement during heating of char mixed with used bed material shows significant alkali uptake by the char. Complementary SEM-EDS studies confirm the alkali results and indicate that other important inorganic elements including Si, Mg, and Ca also migrate from the bed material to the char. The migration of elements initially enhances alkali release and char reactivity, but significantly reduces both during the final stage of the gasification. The observed effects on char gasification become more pronounced with increasing amount of bed material and increasing time the material experienced in an industrial process. The ash-layer on the used bed material is concluded to play an important role as a carrier of alkali and other active components. The char and bed material systems are closely connected under operational conditions, and their material exchange has important implications for the thermal conversion.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 238, article id 107491
Keywords [en]
Char, Gasification, Fluidized bed, Alkali, Potassium, Ash
National Category
Energy Engineering Other Chemical Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-93045DOI: 10.1016/j.fuproc.2022.107491ISI: 000893047000008Scopus ID: 2-s2.0-85137630130OAI: oai:DiVA.org:ltu-93045DiVA, id: diva2:1696163
Funder
Swedish Energy Agency
Note

Validerad;2022;Nivå 2;2022-09-15 (joosat);

Available from: 2022-09-15 Created: 2022-09-15 Last updated: 2023-09-05Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Öhman, Marcus

Search in DiVA

By author/editor
Öhman, Marcus
By organisation
Energy Science
In the same journal
Fuel processing technology
Energy EngineeringOther Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 70 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