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Moisture uptake

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Moisture uptake

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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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