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dc.contributor.authorGarcía Llamas, Ángel David
dc.contributor.authorGuo, Ning
dc.contributor.authorLi, Tian
dc.contributor.authorGebart, Rikard
dc.contributor.authorUmeki, Kentaro
dc.date.accessioned2022-01-18T11:06:32Z
dc.date.available2022-01-18T11:06:32Z
dc.date.created2022-01-10T11:40:06Z
dc.date.issued2021
dc.identifier.citationCombustion and Flame. 2022, 238, .en_US
dc.identifier.issn0010-2180
dc.identifier.urihttps://hdl.handle.net/11250/2837896
dc.description.abstractOur earlier study showed significant differences in average particle velocity between simulation and experimental results for devolatilizing biomass particles in an idealised entrained flow reactor [N. Guo et al., Fuel, 2020]. This indicates that the simulations do not accurately describe the physicochemical transformations and fluid dynamic processes during devolatilization. This article investigates the reasons for these discrepancies using time-resolved analyses of the experimental data and complementary modelling work. The experiments were conducted in a downdraft drop-tube furnace with optical access, which uses a fuel-rich flat flame (CH4single bondO2single bondCO2) to heat the particles. Gas flow was characterized using particle image velocimetry, equilibrium calculations and thermocouple measurements. High-speed images of devolatilizing Norway spruce (Picea Abies) particles were captured and analysed using time-resolved particle tracking velocimetry methods. The data were used to estimate the balance of forces and fuel conversion. Thrust and “rocket-like” motions were frequently observed, followed by quick entrainment in the gas flow. Rocketing particles were, on average, smaller, more spherical and converted faster than their non-rocketing counterparts. These differences in conversion behaviour could be captured by a particle-size dependent, 0-D devolatilization model, corrected for non-isothermal effects. The results from this investigation can provide a basis for future modelling and simulation work relevant for pulverized firing technologies.en_US
dc.language.isoengen_US
dc.publisherElsevier Ltd.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleRapid change of particle velocity due to volatile gas release during biomass devolatilizationen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.volume238en_US
dc.source.journalCombustion and Flameen_US
dc.identifier.doi10.1016/j.combustflame.2021.111898
dc.identifier.cristin1977390
dc.relation.projectNorges forskningsråd: 267916en_US
dc.source.articlenumber111898en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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