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High-speed imaging of biomass particles heated with a laser
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-8355-2414
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-6958-5508
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2013 (English)In: Journal of Analytical and Applied Pyrolysis, ISSN 0165-2370, E-ISSN 1873-250X, Vol. 103, p. 278-286Article in journal (Refereed) Published
Abstract [en]

In this work two types of lignocellulosic biomass particles, European spruce and American hardwood (particle sizes from 100 μm to 500 μm) were pyrolysed with a continuous wave 2 W Nd:YAG laser. Simultaneously a high-speed camera was used to capture the behavior of the biomass particle as it was heated for about 0.1 s. Cover glasses were used as a sample holder which allowed for light microscope studies after the heating. Since the cover glasses are not initially heated by the laser, vapors from the biomass particle are quenched on the glass within about 1 particle diameter from the initial particle. Image processing was used to track the contour of the biomass particle and the enclosed area of the contour was calculated for each frame.The main observations are: There is a significant difference between how much surface energy is needed to pyrolyses the spruce (about 75% more) compared to the hardwood. The oil-like substance which appeared on the glass during the experiment is solid at room temperature and shows different levels of transparency. A fraction of this substance is water soluble. A brownish coat is seen on the unreacted biomass. The biomass showed insignificant swelling as it was heated. The biomass particle appears to melt and boil at the front that is formed between the laser beam and the biomass particle. The part of the particle that is not subjected to the laser beam seems to be unaffected.

Place, publisher, year, edition, pages
2013. Vol. 103, p. 278-286
National Category
Fluid Mechanics and Acoustics Applied Mechanics Energy Engineering
Research subject
Fluid Mechanics; Experimental Mechanics; Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-32454DOI: 10.1016/j.jaap.2012.11.020Local ID: 6f4cd8b9-c6c3-4058-8ecc-0cce7767c23bOAI: oai:DiVA.org:ltu-32454DiVA, id: diva2:1005688
Conference
International Symposium on Analytical and Applied Pyrolysis : 21/05/2012 - 25/05/2012
Note
Validerad; 2013; 20130102 (ysko); Konferensartikel i tidskriftAvailable from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-30Bibliographically approved

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Carlsson, PerLycksam, HenrikGren, PerGebart, RikardWiinikka, Henrik
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