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Effects of raw material particle size distribution on the characteristics of Scots pine sawdust fuel pellets
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry.
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2008 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 89, no 12, 1324-1329 p.Article in journal (Refereed) PublishedText
Abstract [en]

In order to study the influence of raw material particle size distribution on the pelletizing process and the physical and thermomechanical characteristics of typical fuel pellets, saw dust of Scots pine was used as raw material for producing pellets in a semi industrial scaled mill (similar to 300 kg h(-1)). The raw materials were screened to a narrow particle size distribution and mixed into four different batches and then pelletized under controlled conditions. Physical pellet characteristics like compression strength, densities, moisture content, moisture absorption and abrasion resistance were determined. In addition, the thermochemical characteristics, i.e. drying and initial pyrolysis, flaming pyrolysis, char combustion and char yield were determined at different experimental conditions by using a laboratory-scaled furnace. The results indicate that the particle size distribution had some effect on current consumption and compression strength but no evident effect on single pellet and bulk density, moisture content, moisture absorption during storage and abrasion resistance. Differences in average total conversion time determined for pellet batches tested under the same combustion conditions was less than 5% and not significant. The results are of practical importance suggesting that grinding of saw dust particle sizes below 8 mm is probably needless when producing softwood pellets. Thus it seem that less energy could be used if only over sized particles are grinded before pelletizing.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2008. Vol. 89, no 12, 1324-1329 p.
Keyword [en]
Wood-fuel, Bioenergy, Pelletizing, Densification, Burning, Wood-residues
National Category
Chemical Sciences Energy Engineering Bioenergy
URN: urn:nbn:se:umu:diva-117465DOI: 10.1016/j.fuproc.2008.06.001ISI: 000261925200011OAI: diva2:911783
Available from: 2016-03-14 Created: 2016-03-01 Last updated: 2016-03-14Bibliographically approved

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Israelsson, SamuelBoman, Christoffer
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