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
Particle and feeding characteristics of biomass powders
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2013 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Milling of biomass is a necessary key step in suspension gasification or powder combustion. Milled biomass powders are often cohesive, have low bulk density and poor flowability leading to costly problems in fuel handling. Two different milling methods with four different biomass powders have been performed to correlate between particle and feeding properties. Charcoal, Torrefied Norway spruce, Norway spruce and reed canary grass where milled (knife mill or hammer mill) with a screen size of 1 mm. The resulting powders where analyzed using both mechanical sieving and optical sieveless particle size analysis. After bulk and tapped density tests, the powders were fed through a twin screw feeder onto an analytic scale that logged the weight data on a pc. Two tests were made, one with constant screw speed and the other using a built-in function called loss in weight feeding. The hammer mill produced more homogenous powders with more fines than the knife mill. They also had lower bulk and tapped density. The feeding tests were inconclusive as two materials where easier fed when hammer milled and two when knife milled. Hammer milled materials had better initial feeding stability. Another interesting observation was that two of the materials showed good agreement with a feeding rate that could be predicted if assuming tapped density while the other two behaved more similar to what would be the case for bulk density. 

Place, publisher, year, edition, pages
2013. , 19 p.
Keyword [en]
Biomass, Powder
National Category
Other Environmental Engineering
Identifiers
URN: urn:nbn:se:umu:diva-72759OAI: oai:DiVA.org:umu-72759DiVA: diva2:627253
Subject / course
Energiteknik
Educational program
Master of Science Programme in Energy Engineering
Projects
Bio4Energy
Available from: 2013-06-11 Created: 2013-06-11 Last updated: 2013-06-11Bibliographically approved

Open Access in DiVA

fulltext(1631 kB)543 downloads
File information
File name FULLTEXT01.pdfFile size 1631 kBChecksum SHA-512
cf4ab82c1e6c3798fb0e0327621d30150b259d5ee742dab08f31d58b85f3ecd57d2a79841b46e3aa9c3d5b970897f777cc23486fca59893e6d03439110917ede
Type fulltextMimetype application/pdf

By organisation
Department of Applied Physics and Electronics
Other Environmental Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 543 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

urn-nbn

Altmetric score

urn-nbn
Total: 209 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