Uncertainty evaluation by gamma transmission measurements and CFD model comparison in a FCC cold pilot unit
The solid flow in air-catalyst in circulating fluidized bed was simulated with CFD model to obtain axial and radial distribution. Therefore, project parameters were confirmed and steady state operation condition was improved. Solid holds up axial end radial profiles simulation and comparison with ga...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2013-01-01
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| Series: | International Journal of Metrology and Quality Engineering |
| Subjects: | |
| Online Access: | https://www.metrology-journal.org/articles/ijmqe/pdf/2013/01/ijmqe120031.pdf |
| _version_ | 1818888668554723328 |
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| author | Dantas C.C. Moura A.E. de Lima Filho H.J.B. Melo S.B. Dos Santos V.A. Lima E.A.O. |
| author_facet | Dantas C.C. Moura A.E. de Lima Filho H.J.B. Melo S.B. Dos Santos V.A. Lima E.A.O. |
| author_sort | Dantas C.C. |
| collection | DOAJ |
| description | The solid flow in air-catalyst in circulating fluidized bed was simulated with CFD model to obtain axial and radial distribution. Therefore, project parameters were confirmed and steady state operation condition was improved. Solid holds up axial end radial profiles simulation and comparison with gamma transmission measurements are in a good agreement. The transmission signal from an 241Am radioactive source was evaluated in NaI(Tl) detector coupled to multichannel analyzer. This non intrusive measuring set up is installed at riser of a cold pilot unit to determine parameters of FCC catalyst flow at several concentrations. Mass flow rate calculated by combining solid hold up and solid phase velocity measurements was compared with catalyst inlet measured at down-comer. Evaluation in each measured parameter shows that a relative combined uncertainty of 6% in a 95% interval was estimated. Uncertainty analysis took into account a significant correlation in scan riser transmission measurements. An Eulerian approach of CFD model incorporating the kinetic theory of granular flow was adopted to describe the gas–solid two-phase flows in a multizone circulating reactor. Instantaneous and local gas-particle velocity, void fraction and turbulent parameters were obtained and results are shown in 2 D and 3D graphics. |
| first_indexed | 2024-12-19T16:56:47Z |
| format | Article |
| id | doaj.art-3b0a037a36dc472a9eb6d2a010e4ae3b |
| institution | Directory Open Access Journal |
| issn | 2107-6839 2107-6847 |
| language | English |
| last_indexed | 2024-12-19T16:56:47Z |
| publishDate | 2013-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | International Journal of Metrology and Quality Engineering |
| spelling | doaj.art-3b0a037a36dc472a9eb6d2a010e4ae3b2022-12-21T20:13:23ZengEDP SciencesInternational Journal of Metrology and Quality Engineering2107-68392107-68472013-01-014191510.1051/ijmqe/2012031ijmqe120031Uncertainty evaluation by gamma transmission measurements and CFD model comparison in a FCC cold pilot unitDantas C.C.0Moura A.E.1de Lima Filho H.J.B.2Melo S.B.3Dos Santos V.A.4Lima E.A.O.5Department of Nuclear Energy-DEN/UFPE, Federal University of PernambucoDepartment of Nuclear Energy-DEN/UFPE, Federal University of PernambucoDepartment of Chemical Engineering-DEQ/UFPE, Federal University of PernambucoInformatics Center-CIN/UFPE, Federal University of PernambucoDepartment of Chemistry-UNICAPE, Catholic University of PernambucoDepartment of Mathematics-UPE, Universidade de PernambucoThe solid flow in air-catalyst in circulating fluidized bed was simulated with CFD model to obtain axial and radial distribution. Therefore, project parameters were confirmed and steady state operation condition was improved. Solid holds up axial end radial profiles simulation and comparison with gamma transmission measurements are in a good agreement. The transmission signal from an 241Am radioactive source was evaluated in NaI(Tl) detector coupled to multichannel analyzer. This non intrusive measuring set up is installed at riser of a cold pilot unit to determine parameters of FCC catalyst flow at several concentrations. Mass flow rate calculated by combining solid hold up and solid phase velocity measurements was compared with catalyst inlet measured at down-comer. Evaluation in each measured parameter shows that a relative combined uncertainty of 6% in a 95% interval was estimated. Uncertainty analysis took into account a significant correlation in scan riser transmission measurements. An Eulerian approach of CFD model incorporating the kinetic theory of granular flow was adopted to describe the gas–solid two-phase flows in a multizone circulating reactor. Instantaneous and local gas-particle velocity, void fraction and turbulent parameters were obtained and results are shown in 2 D and 3D graphics.https://www.metrology-journal.org/articles/ijmqe/pdf/2013/01/ijmqe120031.pdffcc fluid dynamicsgamma ray scannercfd simulationuncertainty valuationsolid flow |
| spellingShingle | Dantas C.C. Moura A.E. de Lima Filho H.J.B. Melo S.B. Dos Santos V.A. Lima E.A.O. Uncertainty evaluation by gamma transmission measurements and CFD model comparison in a FCC cold pilot unit International Journal of Metrology and Quality Engineering fcc fluid dynamics gamma ray scanner cfd simulation uncertainty valuation solid flow |
| title | Uncertainty evaluation by gamma transmission measurements and CFD model comparison in a FCC cold pilot unit |
| title_full | Uncertainty evaluation by gamma transmission measurements and CFD model comparison in a FCC cold pilot unit |
| title_fullStr | Uncertainty evaluation by gamma transmission measurements and CFD model comparison in a FCC cold pilot unit |
| title_full_unstemmed | Uncertainty evaluation by gamma transmission measurements and CFD model comparison in a FCC cold pilot unit |
| title_short | Uncertainty evaluation by gamma transmission measurements and CFD model comparison in a FCC cold pilot unit |
| title_sort | uncertainty evaluation by gamma transmission measurements and cfd model comparison in a fcc cold pilot unit |
| topic | fcc fluid dynamics gamma ray scanner cfd simulation uncertainty valuation solid flow |
| url | https://www.metrology-journal.org/articles/ijmqe/pdf/2013/01/ijmqe120031.pdf |
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