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Size, shape, and density changes of biomass particles during rapid devolatilization
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
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2017 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 206, 342-351 p.Article in journal (Refereed) Published
Abstract [en]

Particle properties such as size, shape and density play significant roles on particle flow and flame propagationin pulverized fuel combustion and gasification. A drop tube furnace allows for experiments athigh heating rates similar to those found in large-scale appliances, and was used in this study to carryout experiments on pulverized biomass devolatilization, i.e. detailing the first stage of fuel conversion.The objective of this study was to develop a particle conversion model based on optical informationon particle size and shape transformation. Pine stem wood and wheat straw were milled and sieved tothree narrow size ranges, rapidly heated in a drop tube setup, and solid residues were characterized usingoptical methods. Different shape descriptors were evaluated and a shape descriptor based on particleperimeter was found to give significant information for accurate estimation of particle volume. The opticalconversion model developed was proven useful and showed good agreement with conversion measuredusing a reference method based on chemical analysis of non-volatilized ash forming elements.The particle conversion model presented can be implemented as a non-intrusive method for in-situ monitoringof particle conversion, provided density data has been calibrated.

Place, publisher, year, edition, pages
2017. Vol. 206, 342-351 p.
Keyword [en]
PIV, DTR, Pyrolysis, Biomass conversion
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:umu:diva-136564DOI: 10.1016/j.fuel.2017.06.009ISI: 000405805800035OAI: oai:DiVA.org:umu-136564DiVA: diva2:1112128
Available from: 2017-06-19 Created: 2017-06-19 Last updated: 2017-08-21Bibliographically approved

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Holmgren, PerWagner, David R.Strandberg, AnnaBroström, Markus
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  • de-DE
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