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
Fragmentation of dolomite bed material at elevated temperature in the presence of H2O & CO2: Implications for fluidized bed gasification
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.ORCID iD: 0000-0002-9760-9298
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0002-2460-914X
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0002-6326-4084
2020 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 260, article id 116340Article in journal (Refereed) Published
Abstract [en]

With the aims of improving the understanding of the use of dolomite bed materials in a fluidized bed (FB) gasifier, dolomite primary fragmentation behaviors and mechanisms at elevated temperatures were thoroughly investigated by means of quantitative analysis of particles production, size distribution, and particles shape (in terms of HS circularity and convexity). Crystalline Glanshammar and amorphous Sala dolomites of different original particle sizes (300-350 mu m, 350-500 mu m, and 500-1000 mu m) were treated under various conditions, such as temperatures of 650,750, and 950 degrees C and gas conditions of N-2, N-2 & steam, and H2O & CO2. Crystalline Glanshammar dolomite exhibited severe fragmentation, while amorphous Sala dolomite only fragmented slightly. Fragmentation mechanisms were proposed for amorphous and crystalline dolomite. In case of the Glanshammar dolomite, the release of H2O trapped in the crystal lattices and trace level of CO2 at structure defects, contributed to 10% and 55% of the primary fragmentation, respectively. The presence of CO2 can significantly mitigate the fragmentation of crystalline Glanshammar dolomite, which is probably either due to the prevention of CO2-dissociation at the defects or filling of cations by interchanging CO2- with the dolomite, consequently, allowing for a stabilization of dolomite structure. The analysis shows that elutriation in fluidized bed gasifier can be reduced significantly when either using amorphous Sala dolomite as bed material or treatment of the Glanshammar dolomite in the presence of CO2 before its utilization in a fluidized bed.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 260, article id 116340
Keywords [en]
Dolomite, Fragmentation mechanism, Crystalline, Calcination, Fluidized bed
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-263659DOI: 10.1016/j.fuel.2019.116340ISI: 000491885400040Scopus ID: 2-s2.0-85073165975OAI: oai:DiVA.org:kth-263659DiVA, id: diva2:1368800
Note

QC 20191108

Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-11-08Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Zhou, ChunguangRosén, ChristerEngvall, Klas

Search in DiVA

By author/editor
Zhou, ChunguangRosén, ChristerEngvall, Klas
By organisation
Chemical EngineeringProcess Technology
In the same journal
Fuel
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 69 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