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Size, shape, and density changes of biomass particles during rapid devolatilization
Umeå University, Sweden.
Umeå University, Sweden.
Umeå University, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.
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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 propagation in pulverized fuel combustion and gasification. A drop tube furnace allows for experiments at high heating rates similar to those found in large-scale appliances, and was used in this study to carry out 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 information on particle size and shape transformation. Pine stem wood and wheat straw were milled and sieved to three narrow size ranges, rapidly heated in a drop tube setup, and solid residues were characterized using optical methods. Different shape descriptors were evaluated and a shape descriptor based on particle perimeter was found to give significant information for accurate estimation of particle volume. The optical conversion model developed was proven useful and showed good agreement with conversion measured using 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 monitoring of particle conversion, provided density data has been calibrated.

Place, publisher, year, edition, pages
2017. Vol. 206, 342-351 p.
Keyword [en]
Biomass conversion, DTR, PIV, Pyrolysis
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-30788DOI: 10.1016/j.fuel.2017.06.009Scopus ID: 2-s2.0-85020711254OAI: oai:DiVA.org:ri-30788DiVA: diva2:1138750
Available from: 2017-09-06 Created: 2017-09-06 Last updated: 2017-09-06Bibliographically approved

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