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Use of excess heat from ethylene recycling in a low-density polyethylene production plant

2018-07Journal article Restricted access
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dc.contributor.authorMatos, Rodolfo D. C.
dc.contributor.authorJoão, Isabel
dc.contributor.authorSilva, João
dc.date.accessioned2018-07-25T08:08:22Z
dc.date.available2018-07-25T08:08:22Z
dc.date.issued2018-07
dc.description.abstractThe recovery of the wasted heat is an effective way of improving the energy efficiency of industry sites and can contribute to the reduction of the operating costs and the CO2 emissions. In the production of low density polyethylene, the polymerisation reaction is carried out with a large excess of ethylene at very high pressure. The excess ethylene is separated at an intermediate pressure (around 280 bar and 310 °C) and then it is recycled. In this recycle, the stream is cooled in several steps to temperatures close to 35 °C before being recompressed. In some units, the first cooling is carried out with air coolers up to temperatures around 130 °C. In a unit with a recycle of 33 t/h, this cooling corresponds to releasing to the atmosphere about 4.6 MW of thermal power. We present a study of different alternatives for the use of this excess heat. We studied the implementation of a refrigeration cycle by absorption with LiBr/H2O, the production of steam and the electricity generation by Rankine and Kalina cycles. The Aspen HYSYS process simulator was used to study the different alternatives. The capital cost was estimated for each of the evaluated options as well as the benefits expected to be obtained. In the study conditions, the absorption refrigeration cycle is the best solution presenting a return period of 3 years.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMATOS, Rodolfo D. C.; JOÃO, Isabel M.; SILVA, João M. – Use of excess heat from ethylene recycling in a low-density polyethylene production plant. Computer Aided Chemical Engineering. ISSN 1570-7946. Vol. 43 (2018), pp. 1275-1280pt_PT
dc.identifier.doihttps://doi.org/10.1016/B978-0-444-64235-6.50224-2pt_PT
dc.identifier.issn1570-7946
dc.identifier.urihttp://hdl.handle.net/10400.21/8710
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.subjectExcess heatpt_PT
dc.subjectEnergy efficiencypt_PT
dc.subjectEconomic evaluationpt_PT
dc.titleUse of excess heat from ethylene recycling in a low-density polyethylene production plantpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FQUI%2F00100%2F2013/PT
oaire.citation.endPage1280pt_PT
oaire.citation.startPage1275pt_PT
oaire.citation.titleComputer Aided Chemical Engineeringpt_PT
oaire.citation.volume43pt_PT
oaire.fundingStream5876
person.familyNameJoao
person.familyNameSilva
person.givenNameIsabel
person.givenNameJoão Miguel Alves da
person.identifierfWmw7kEAAAAJ
person.identifier.ciencia-idC416-F221-D47C
person.identifier.ciencia-id3D1F-BD3A-4A9D
person.identifier.orcid0000-0002-8690-1584
person.identifier.orcid0000-0003-1244-6483
person.identifier.ridA-7333-2012
person.identifier.scopus-author-id25122950800
person.identifier.scopus-author-id16317291000
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication745aa38e-ab36-4b06-8387-c1ff7a55da32
relation.isAuthorOfPublication36449517-d0f7-4619-aae3-81af776b82fd
relation.isAuthorOfPublication.latestForDiscovery745aa38e-ab36-4b06-8387-c1ff7a55da32
relation.isProjectOfPublication42e2c67b-cc38-4020-bc4d-950bf9ae00c9
relation.isProjectOfPublication.latestForDiscovery42e2c67b-cc38-4020-bc4d-950bf9ae00c9

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