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Superheated steam drying of sawdust in continuous feed spouted beds: a design perspective
Karlstad University, Faculty of Health, Science and Technology (starting 2013).ORCID iD: 0000-0002-9707-8896
Karlstad University, Faculty of Technology and Science, Department of Energy, Environmental and Building Technology. (Miljö- och energisystem)ORCID iD: 0000-0002-5764-7062
2014 (English)In: Biomass and Bioenergy, ISSN 0961-9534, Vol. 71, no 0, 228-234 p.Article in journal (Refereed) Published
Abstract [en]

Spouted bed drying technology shows promising results for the drying of unscreened sawdust in superheated steam. In this paper, the experiences from designing, running and evaluating two spouted bed continuous feed dryers are presented. Stable running conditions and drying results have been achieved. This has been particularly important for sawdust that will be compressed into pellets or briquettes. The spouted bed superheated steam dryer also shows high potential for energy efficient integration into sawmills. Our recommendation is thus, to use the outlet steam temperature as the control parameter for the outlet moisture content. A drying rate above and one below the fibre saturation level, can be identified. Visual observations through the viewing glass in the drying zone in both the dryers clearly showed that not all of the material participated in the spout at all times; there were, however, no indications of dead zones. A heat transfer analysis indicated that only about 70% of the surface area of the material was in thermal contact with the steam. This paper sums up the experiences regarding drying properties, control and system properties obtained when sawdust is dried using superheated steam as the drying medium. Further work on standardised dryers in series or in parallel is necessary to increase the capacity in the spouted bed dryer.

Place, publisher, year, edition, pages
2014. Vol. 71, no 0, 228-234 p.
Keyword [en]
Sawdust, Drying, Spouted bed, Sawmills, Superheated steam
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
URN: urn:nbn:se:kau:diva-34915DOI: 10.1016/j.biombioe.2014.10.004ISI: 000345349500022OAI: diva2:780896
Available from: 2015-01-15 Created: 2015-01-15 Last updated: 2016-05-25Bibliographically approved

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Berghel, JonasRenström, Roger
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Faculty of Health, Science and Technology (starting 2013)Department of Energy, Environmental and Building Technology
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