CFD simulation of an industrial FCC regenerator

Through a Computational Fluid Dynamics (CFD) simulation of the particle laden flow of the two stages of a Fluid Catalytic Cracking (FCC) High Temperature Regenerator (HTR), new designs for the particle distributor in the combustor stage and the arm disengagers in the regenerator stage that improved...

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Autores:
Alzate Hernández, Juan David
Tipo de recurso:
Fecha de publicación:
2016
Institución:
Universidad Nacional de Colombia
Repositorio:
Universidad Nacional de Colombia
Idioma:
spa
OAI Identifier:
oai:repositorio.unal.edu.co:unal/57858
Acceso en línea:
https://repositorio.unal.edu.co/handle/unal/57858
http://bdigital.unal.edu.co/54307/
Palabra clave:
54 Química y ciencias afines / Chemistry
66 Ingeniería química y Tecnologías relacionadas/ Chemical engineering
Fluid catalytic
Cracking regenerator
Rights
openAccess
License
Atribución-NoComercial 4.0 Internacional
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repository_id_str
spelling Atribución-NoComercial 4.0 InternacionalDerechos reservados - Universidad Nacional de Colombiahttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Molina Ochoa, AlejandroAlzate Hernández, Juan David65c7bb04-01a7-40eb-b5a5-703ce2d0ea373002019-07-02T13:19:51Z2019-07-02T13:19:51Z2016-08-24https://repositorio.unal.edu.co/handle/unal/57858http://bdigital.unal.edu.co/54307/Through a Computational Fluid Dynamics (CFD) simulation of the particle laden flow of the two stages of a Fluid Catalytic Cracking (FCC) High Temperature Regenerator (HTR), new designs for the particle distributor in the combustor stage and the arm disengagers in the regenerator stage that improved the HTR performance were proposed. The simulations involved 580 thousand cells for the combustor and 1.5 million cells for the regenerator and were conducted with the commercial CFD software package Fluent 15.0 using an Euler-Euler model and a phase-coupled SIMPLE algorithm. Athorough analysis of a 298-hole air distributor conducted prior to the combustor simulation, set the air flow boundary conditions of the 22 m high and 3.2 m diameter combustor. After the evaluation of several drag models available in the literature, the Modified model with cluster diameters of 400 m and 200 m for the dense and dilute phases, respectively, reproduced the theoretical characteristics of the turbulent bed that is typical of HTR combustors. The same drag model also reproduced the bubbling bed that is reported for the regenerator stage of HTRs. An analysis of the solid distribution showed that when solids enter the reactor through simple inlets located at opposite locations, the solid distribution is poor. However, when a two-arm, solid distributor that includes six lateral and a central inlet is implemented, the solid distribution improves, as the mal-distribution coefficient (Mf ) decreases from 0.31 to 0.22 in the most critical region of the dense phase. Improvements in the characteristics of the Residence Time Distribution (RTD) and the size of the bed are also evidence of the benefits that the new proposed combustor design gives to the HTR performance. For the regenerator stage of the HTR the CFD simulation revealed the existence of a high-velocity field surrounding the solid disengangers that transport the solid from the combustor. This high velocity contributed to a relatively high solid flow through the cyclones, 42%, when compared to the recommended range of 20% to 30%. By increasing the length of the disenganger shroud, the gas velocity decreased and the solid flow though cyclones was reduced to 34%. The two simulations illustrate the ability of CFD to improve the performance of complex industrial equipmentMaestríaapplication/pdfspaUniversidad Nacional de Colombia Sede Medellín Facultad de Minas Escuela de Procesos y EnergíaEscuela de Procesos y EnergíaAlzate Hernández, Juan David (2016) CFD simulation of an industrial FCC regenerator. Maestría thesis, Universidad Nacional de Colombia - Sede Medellín.54 Química y ciencias afines / Chemistry66 Ingeniería química y Tecnologías relacionadas/ Chemical engineeringFluid catalyticCracking regeneratorCFD simulation of an industrial FCC regeneratorTrabajo de grado - Maestríainfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/acceptedVersionTexthttp://purl.org/redcol/resource_type/TMORIGINAL1017175842.2016.pdfTesis de Maestría en Ingeniería - Ingeniería Químicaapplication/pdf4501698https://repositorio.unal.edu.co/bitstream/unal/57858/1/1017175842.2016.pdf047232c2a1a3d1f04511399a8af64ef7MD51THUMBNAIL1017175842.2016.pdf.jpg1017175842.2016.pdf.jpgGenerated Thumbnailimage/jpeg4162https://repositorio.unal.edu.co/bitstream/unal/57858/2/1017175842.2016.pdf.jpgc7134d4ed1d44a97b30b26e67646a2d2MD52unal/57858oai:repositorio.unal.edu.co:unal/578582023-10-10 22:38:22.883Repositorio Institucional Universidad Nacional de Colombiarepositorio_nal@unal.edu.co
dc.title.spa.fl_str_mv CFD simulation of an industrial FCC regenerator
title CFD simulation of an industrial FCC regenerator
spellingShingle CFD simulation of an industrial FCC regenerator
54 Química y ciencias afines / Chemistry
66 Ingeniería química y Tecnologías relacionadas/ Chemical engineering
Fluid catalytic
Cracking regenerator
title_short CFD simulation of an industrial FCC regenerator
title_full CFD simulation of an industrial FCC regenerator
title_fullStr CFD simulation of an industrial FCC regenerator
title_full_unstemmed CFD simulation of an industrial FCC regenerator
title_sort CFD simulation of an industrial FCC regenerator
dc.creator.fl_str_mv Alzate Hernández, Juan David
dc.contributor.author.spa.fl_str_mv Alzate Hernández, Juan David
dc.contributor.spa.fl_str_mv Molina Ochoa, Alejandro
dc.subject.ddc.spa.fl_str_mv 54 Química y ciencias afines / Chemistry
66 Ingeniería química y Tecnologías relacionadas/ Chemical engineering
topic 54 Química y ciencias afines / Chemistry
66 Ingeniería química y Tecnologías relacionadas/ Chemical engineering
Fluid catalytic
Cracking regenerator
dc.subject.proposal.spa.fl_str_mv Fluid catalytic
Cracking regenerator
description Through a Computational Fluid Dynamics (CFD) simulation of the particle laden flow of the two stages of a Fluid Catalytic Cracking (FCC) High Temperature Regenerator (HTR), new designs for the particle distributor in the combustor stage and the arm disengagers in the regenerator stage that improved the HTR performance were proposed. The simulations involved 580 thousand cells for the combustor and 1.5 million cells for the regenerator and were conducted with the commercial CFD software package Fluent 15.0 using an Euler-Euler model and a phase-coupled SIMPLE algorithm. Athorough analysis of a 298-hole air distributor conducted prior to the combustor simulation, set the air flow boundary conditions of the 22 m high and 3.2 m diameter combustor. After the evaluation of several drag models available in the literature, the Modified model with cluster diameters of 400 m and 200 m for the dense and dilute phases, respectively, reproduced the theoretical characteristics of the turbulent bed that is typical of HTR combustors. The same drag model also reproduced the bubbling bed that is reported for the regenerator stage of HTRs. An analysis of the solid distribution showed that when solids enter the reactor through simple inlets located at opposite locations, the solid distribution is poor. However, when a two-arm, solid distributor that includes six lateral and a central inlet is implemented, the solid distribution improves, as the mal-distribution coefficient (Mf ) decreases from 0.31 to 0.22 in the most critical region of the dense phase. Improvements in the characteristics of the Residence Time Distribution (RTD) and the size of the bed are also evidence of the benefits that the new proposed combustor design gives to the HTR performance. For the regenerator stage of the HTR the CFD simulation revealed the existence of a high-velocity field surrounding the solid disengangers that transport the solid from the combustor. This high velocity contributed to a relatively high solid flow through the cyclones, 42%, when compared to the recommended range of 20% to 30%. By increasing the length of the disenganger shroud, the gas velocity decreased and the solid flow though cyclones was reduced to 34%. The two simulations illustrate the ability of CFD to improve the performance of complex industrial equipment
publishDate 2016
dc.date.issued.spa.fl_str_mv 2016-08-24
dc.date.accessioned.spa.fl_str_mv 2019-07-02T13:19:51Z
dc.date.available.spa.fl_str_mv 2019-07-02T13:19:51Z
dc.type.spa.fl_str_mv Trabajo de grado - Maestría
dc.type.driver.spa.fl_str_mv info:eu-repo/semantics/masterThesis
dc.type.version.spa.fl_str_mv info:eu-repo/semantics/acceptedVersion
dc.type.content.spa.fl_str_mv Text
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status_str acceptedVersion
dc.identifier.uri.none.fl_str_mv https://repositorio.unal.edu.co/handle/unal/57858
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url https://repositorio.unal.edu.co/handle/unal/57858
http://bdigital.unal.edu.co/54307/
dc.language.iso.spa.fl_str_mv spa
language spa
dc.relation.ispartof.spa.fl_str_mv Universidad Nacional de Colombia Sede Medellín Facultad de Minas Escuela de Procesos y Energía
Escuela de Procesos y Energía
dc.relation.references.spa.fl_str_mv Alzate Hernández, Juan David (2016) CFD simulation of an industrial FCC regenerator. Maestría thesis, Universidad Nacional de Colombia - Sede Medellín.
dc.rights.spa.fl_str_mv Derechos reservados - Universidad Nacional de Colombia
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_abf2
dc.rights.license.spa.fl_str_mv Atribución-NoComercial 4.0 Internacional
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dc.rights.accessrights.spa.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-NoComercial 4.0 Internacional
Derechos reservados - Universidad Nacional de Colombia
http://creativecommons.org/licenses/by-nc/4.0/
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.mimetype.spa.fl_str_mv application/pdf
institution Universidad Nacional de Colombia
bitstream.url.fl_str_mv https://repositorio.unal.edu.co/bitstream/unal/57858/1/1017175842.2016.pdf
https://repositorio.unal.edu.co/bitstream/unal/57858/2/1017175842.2016.pdf.jpg
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