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Energy efficiency in low consistency refining: a study using a Valley beater

2019Journal article Restricted access
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dc.contributor.authorVaz, Álvaro
dc.contributor.authorEspírito-Santo, António
dc.contributor.authorAraújo, Pedro
dc.contributor.authorSimões, Rogério
dc.contributor.authorSilvy, Jacques
dc.date.accessioned2020-02-07T17:21:08Z
dc.date.available2020-02-07T17:21:08Z
dc.date.issued2019
dc.description.abstractThe purpose of this work was to study the influence of pulp fiber suspensions refining operating variables on energy efficiency coefficient. Three chemical pulps with different average morphological characteristics were used, obtained from bleached kraft Pinus sylvestris, Eucalyptus globulus and Betula verrucosa. The final objective was to establish the chemical pulps refining efficiency parameters. Refining hydromechanics and energy consumption profiles were analyzed. Average normal and tangential forces on pulp suspension in the gap clearance, resulting rotor-stator distance and no-load and refining conditions power consumption were obtained. The refining trials took place in a laboratory Valley beater, and the manipulated variables were charge on the roll and rotor rotation speed. Global relationships for tangential stress and energy efficiencies in terms of rotation speed and rotor-stator gap were obtained. A relationship between energy efficiency and shear stress was obtained. The results have shown that in a Valley beater increased rotor-stator gaps reduce energy efficiency, concomitantly increasing apparent viscosity and reducing shear stress. No-load power was seen to increase with crowding factor, and thus with flocculation. Inversely, crowding factor and ultimately flocculation had an adverse effect on energy efficiency.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationVaz, Á., Espírito-Santo, A., Araújo, P., et al. (2019). Energy efficiency in low consistency refining: a study using a Valley beater. Nordic Pulp & Paper Research Journal, 34(1), pp. 67-74. Retrieved 27 Jan. 2020, from doi:10.1515/npprj-2018-0009pt_PT
dc.identifier.doi10.1515/npprj-2018-0009pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.6/9154
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherDe Gruyterpt_PT
dc.relation.publisherversionhttps://www.degruyter.com/view/j/npprj.2019.34.issue-1/npprj-2018-0009/npprj-2018-0009.xmlpt_PT
dc.subjectChemical pulpspt_PT
dc.subjectEnergy efficiencypt_PT
dc.subjectGap clearancept_PT
dc.subjectPulp rheologypt_PT
dc.subjectRefining energypt_PT
dc.subjectShear stresspt_PT
dc.titleEnergy efficiency in low consistency refining: a study using a Valley beaterpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceDe Gruyterpt_PT
oaire.citation.endPage74pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage67pt_PT
oaire.citation.titleNordic Pulp and Paper Research Journalpt_PT
oaire.citation.volume34pt_PT
person.familyNameVaz
person.familyNameSimões
person.givenNameÁlvaro Frederico Campos
person.givenNameRogério Manuel Santos
person.identifier.ciencia-idB017-2B7B-2F19
person.identifier.ciencia-id2F16-2E30-714A
person.identifier.ciencia-idC61A-FEC7-573C
person.identifier.orcid0000-0001-8505-8209
person.identifier.orcid0000-0002-9540-8900
person.identifier.orcid0000-0001-8143-1555
rcaap.embargofctCopyright cedido à editora no momento da publicaçãopt_PT
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationebb326e6-4b01-40f2-81ff-b8c38eeddcf9
relation.isAuthorOfPublication6dc6521b-5df8-4491-8813-126234b9972f
relation.isAuthorOfPublication09cfc862-f9eb-4943-862c-790e0224d370
relation.isAuthorOfPublication.latestForDiscoveryebb326e6-4b01-40f2-81ff-b8c38eeddcf9

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