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Enhancing Fuel Pellets from Torrefied Biomass: Properties and Applications

This study investigates the production and properties of fuel pellets derived from torrefied biomass, specifically Norway spruce (Picea abies). By varying the torrefaction temperatures (250-300 °C), we analyze how temperature influences pellet stability, compression strength, and moisture uptake. The research employs both chemical analysis and physical testing using a single pellet press unit to evaluate the pelletizing properties. Our findings indicate that higher torrefaction temperatures lead to changes in fracture surface characteristics and energy absorption during pelletization. Further implications for bioenergy applications are discussed.

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Enhancing Fuel Pellets from Torrefied Biomass: Properties and Applications

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  1. Fuel pellets from torrefied biomassWolfgang Stelte1, Craig Clemons2, Jens K. Holm3, Anand R. Sanadi4, Lei Shang1, Jesper Ahrenfeldt1 and Ulrik B. Henriksen11Biomass Gasification Group, Biosystems Department, Risø – Danish National Laboratory for Sustainable Energy, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark2 USDA – Forest Products Laboratory, One Gifford Pinchot Dr, Madison, WI, USA3Chemical Engineering, DONG Energy Power A/S; A.C. Meyers Vænge 9, DK-2450, Copenhagen SV, Denmark4Forest and Landscape Denmark, Copenhagen University, Rolighedsvej 23, DK-1985 Frederiksberg C, Denmark Torrefaction Pressure increase in press channel Pressure in press channelincreaseswith torrefaction temperature High frictionbetween torrefied biomassand press channel wall Norway Spruce (Piceaabies K.) 250, 275 and 300 °C for 2 hoursunder Nitrogen flow Pellet stability Chemical analysis Strongacidhydrolysiswith 72% (w/w) sulfuricacid Solublefraction is used for sugaranalysisusingchromatographyInsolublefraction is used for Klason lignin and ash determination * includinginsolubleproducts from thermaldegradation Moisture uptake Decreasingcompressionstrengthforhigh torrefaction temperatures Fracture surface analysis Conditioningofthematerialsat 65, 80 and 90 % RH fortwoweeks Pelletizing properties Spruce Torrefied spruce (275°C) Single pellet press unit to test pelletizingproperties Fracturessurfaceof a pellet madefromspruceand torrefied spruce (275°C). Cohesivefailurewithhighenergyabsorption vs. brittlefailure. References • Stelte, W. et al. Biomass and Bioenergy2011, 35, 910-918 • Holm, J.K. et al. Energy & Fuels 2007, 21, (4), 2446-2449. • Holm, J. K.; Henriksen, U. B.; Hustad, J. E.; Sorensen, L. H. Energy & Fuels 2006, 20, (6), 2686-2694. * The material presented on thisposterhasbeensubmittedforpublication in BiomassandBioenergy

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