A CFD study on the start-up hydrodynamics of fluid catalytic cracking regenerator integrated with chemical looping combustion

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dc.authoridERDOGAN, AHMET/0000-0001-8349-0006
dc.authoridGulec, Fatih/0000-0001-9045-4281
dc.authorwosidERDOGAN, AHMET/AAT-4506-2021
dc.contributor.authorErdogan, Ahmet
dc.contributor.authorGulec, Fatih
dc.date.accessioned2024-08-04T20:55:05Z
dc.date.available2024-08-04T20:55:05Z
dc.date.issued2024
dc.departmentİnönü Üniversitesien_US
dc.description.abstractThe integration of chemical looping combustion with fluid catalytic cracking (CLC-FCC) is an innovative concept that serves as a cost-effective method for CO2 capture in refineries. This approach has the potential to reduce refinery CO(2 )emissions by 25-35%, offering a promising solution. As in the conventional FCC unit, it is common for CLC-FCC regenerators to be exposed to an on-off process while they are being maintained and cleaned. The novelty of this research lies in its specific focus on a less-explored phase (start-up) of CLC-FCC regenerators, the application of advanced CFD modeling, and the comprehensive analysis of operational parameters that influence the system's performance. To validate the CFD simulations of the different drag models for solid-gas granular, bed density profiles under steady-state conditions, collected from industrial processes, were used. For the flow period based on the start-up process of the drag models, the fluidization gas inlet geometry of the regenerator, flow regime (laminar and turbulent), and superficial gas velocity were comprehensively investigated to reveal their effects on hydrodynamic characteristics. The results show that Gidaspow and Syamlal-O'Brien drag models of the solid-gas multiphase granular flow exhibited a better fit with industrial data. The Syamlal-O'Brien and Gidaspow models closely align with industrial data under steady-state conditions, displaying similar bed densities in the dense phase region (230-310 kg/m(3) for Syamlal-O'Brien and 235-300 kg/m(3) for Gidaspow). During the initial stage (less than 0.2 seconds), both laminar and turbulent models yield comparable bed density profiles, approximately 510 kg/m(3) in the dense phase. However, as the process progresses, the dense phase density decreases to about 250-350 kg/m(3) at around 0.5 seconds, with laminar flow models showing a slightly better fit with industrial data. Notably, at 0.5 seconds of fluidization time, inlet geometries having better gas distribution achieve a highly diluted phase with bed densities of 10-20 kg/m(3). Reaching a steady state, the bed density decreases from around 400 kg/m(3) to 260-300 kg/m(3), expanding into a higher section of the regenerator where it aligns well with industrial data. The increase in superficial gas velocity would result in the clarification of the difference and well mixing of the solid-gas multiphase flow.en_US
dc.description.sponsorshipUniversity of Nottingham, Faculty Pro-Vice-Chancellor Research Acceleration Fund [NA]; Engineering and Physical Sciences Research Council [EP/S036113/1]en_US
dc.description.sponsorshipThis work was supported by the University of Nottingham, Faculty Pro-Vice-Chancellor Research Acceleration Fund [NA]; Engineering and Physical Sciences Research Council [EP/S036113/1].en_US
dc.identifier.doi10.1080/15567036.2024.2311327
dc.identifier.endpage2956en_US
dc.identifier.issn1556-7036
dc.identifier.issn1556-7230
dc.identifier.issue1en_US
dc.identifier.scopus2-s2.0-85184430289en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage2941en_US
dc.identifier.urihttps://doi.org/10.1080/15567036.2024.2311327
dc.identifier.urihttps://hdl.handle.net/11616/101802
dc.identifier.volume46en_US
dc.identifier.wosWOS:001158493400001en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherTaylor & Francis Incen_US
dc.relation.ispartofEnergy Sources Part A-Recovery Utilization and Environmental Effectsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectCO2 captureen_US
dc.subjectchemical looping combustionen_US
dc.subjectcomputational fluid dynamicsen_US
dc.subjecthydrodynamicsen_US
dc.subjectCLC-FCCen_US
dc.titleA CFD study on the start-up hydrodynamics of fluid catalytic cracking regenerator integrated with chemical looping combustionen_US
dc.typeArticleen_US

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