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Comparative scaling analysis of two different sized pilot-scale fluidized bed reactors operating with biomass substrates

dc.contributor.authorCardoso, João
dc.contributor.authorSilva, Valter
dc.contributor.authorEusébio, Daniela
dc.contributor.authorBrito, Paulo
dc.contributor.authorHall, M.J.
dc.contributor.authorTarelho, Luís
dc.date.accessioned2019-02-22T14:58:22Z
dc.date.available2019-02-22T14:58:22Z
dc.date.issued2018
dc.description.abstractThis paper presents a comparative scaling analysis of two different sized pilot-scale fluidized bed reactors operating with biomass substrates. A multiphase Eulerian-Eulerian 2-D mathematical model was implemented, coupled with in-house user-defined functions (UDF) built to enhance hydrodynamics and heat transfer phenomena. The model validation was attained by comparison to experimental data gathered from both reactors. A grid refinement study was carried out for both geometries to achieve an appropriate computational domain. Hydrodynamics was deeply studied for both reactors concerning the scale-up effect. Mixing and segregation phenomena, solid particle distribution and biomass velocity were matters of great concern. Results showed that UDF implementation successfully minimized deviations and increased the model’s predictability. The largest deviations measured between experimental and numerical results for syngas composition were of about 20%. Solids mixing and segregation was found to be directly affected by the particles size, density, and superficial gas velocity, with the larger reactor revealing improved mixing ability. Improved mixing occurred for smaller particles size ratio (dbiomass ¼ 3 mm), smaller particles density ratio (rbiomass ¼ 950 kg/m3), and higher dimensionless superficial gas velocities (U0=Umf¼3.5). The larger unit showed an increase in near-wall velocity, lateral dispersion, and bubble size. As for the smaller reactor, higher velocities were obtained at the center region due to a more pronounced wall boundary layer. Similarities were found between the two reactors regarding the bubble distribution, dimensionless average bed pressure drop and biomass velocity vector profiles when dimensionless parameters were employed.pt_PT
dc.description.sponsorshipPOCI-01-0145-FEDER-007638
dc.description.sponsorshipIF/01772/2014
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doihttps://doi.org/10.1016/j.energy.2018.03.090pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.26/27953
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationCentre for Environmental and Marine Studies
dc.subjectHydrodynamicspt_PT
dc.subjectScale-uppt_PT
dc.subjectPilot-scale bubbling fluidized bed gasifierpt_PT
dc.subjectBiomass gasificationpt_PT
dc.subjectMixing and segregation indexpt_PT
dc.subjectANSYS FLUENTpt_PT
dc.titleComparative scaling analysis of two different sized pilot-scale fluidized bed reactors operating with biomass substratespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre for Environmental and Marine Studies
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FAMB%2F50017%2F2013/PT
oaire.citation.endPage535pt_PT
oaire.citation.startPage520pt_PT
oaire.citation.titleEnergypt_PT
oaire.fundingStream6817 - DCRRNI ID
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isProjectOfPublication8f7058da-a8f3-4731-8929-79a12a46acc5
relation.isProjectOfPublication.latestForDiscovery8f7058da-a8f3-4731-8929-79a12a46acc5

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