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Theoretical Effects of Recirculation of Drying Gases in a Co-current Rotary Dryer
Karlstad University, Faculty of Technology and Science, Department of Energy, Environmental and Building Technology.ORCID iD: 0000-0003-2528-4399
2005 (English)Conference paper, Published paper (Other (popular science, discussion, etc.))
Abstract [en]

The most energy demanding process in manufacturing of biofuels is drying. When drying is needed it is together with the raw material the main cost factors for pellet production. The most common drying technique used in the Swedish pellet industry for drying sawdust is a direct-fired rotary dryer. Recirculation of drying gases can contribute to energy efficient operation of dryers.



Improvements due to recirculation of drying gases are elucidated in four system configuration scenarios using a mathematical model. The results indicate that for different scenarios the dew point of the gases leaving the dryer may be unaffected or increase significantly when the recirculation ratio increases. The latter is important for the district heating demand as a higher dew point implies that the energy recovered in the condenser becomes more useful especially at higher return flow temperatures. Optimisation of the drying process regarding dryer capacity and energy recovery is suggested

Place, publisher, year, edition, pages
2005.
Keywords [en]
Drying, recirculation, sawdust, heat recovery, dew point
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
URN: urn:nbn:se:kau:diva-24841OAI: oai:DiVA.org:kau-24841DiVA, id: diva2:598612
Conference
Proceedings of the 3rd Nordic Drying Conference, Karlstad, Sweden, 15-17 June 2005
Note

Distrubution: magnus.stahl@kau.se

Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2016-05-26

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