3D Unsteady Multiphase Simulation of Uranium Tetrafluoride Particle Fluorination in Fluidized Bed Pilot

Konan, N. A.; Neau, Hervé; Simonin, Olivier; Dupoizat, Marc; Geaziou, T. Le

doi:10.1007/978-3-642-02682-9_180

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…This was because of the thermal boundary conditions imposed at the AR wall. By account ing for a radiative (particle particle, particle wall) heat flux, a more uniform distribution within AR and lower value at the bot tom should result (Konan et al, 2010a;Konan et al, 2010b). The effect of particle volume fraction on the oxidation reac tion was also analyzed.…”

Section: 40mentioning

confidence: 99%

Unsteady three-dimensional theoretical model and numerical simulation of a 120-kW chemical looping combustion pilot plant

Hamidouche

Masi

Fede

et al. 2019

Chemical Engineering Science

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Section: 40mentioning

confidence: 99%

Unsteady three-dimensional theoretical model and numerical simulation of a 120-kW chemical looping combustion pilot plant

Hamidouche

Masi

Fede

et al. 2019

Chemical Engineering Science

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“…The transport equations have been written for each "k" phase, [36], [37] which can be the gas phase (k = g), or both particle phases (PVC: k = p or glass beads: k = b), and are summarized in Table 2.…”

Section: Transport Equationsmentioning

confidence: 99%

Determination of PVC powder drying kinetics at particle scale: Experimental study and modeling

et al. 2016

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“…In 2009, Konan et al [10] describe additional terms and equations in order to take into account a reactive flow. This paper deals with a monosolid fluidized bed.…”

Section: Mass Balance Equationmentioning

confidence: 99%

“…Eaton et al (1999) [9] detailed the numerical approach for the study of reactive multiphase flows, especially for coal pyrolysis. Konan et al [10] performed numerical simulations of a reactive fluidized bed with a N-phase CFD code in the framework of uranium fluorination. In 2008, Cao et al [11] performed 2D numerical simulation of a FCC regenerator taking into account mass transfers between particle and gas due to the heterogeneous reaction and thermal transfers.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Study of Reactive Dense Fluidized Bed for FCC Regenerator

Moula

Nastoll²,

Simonin³

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-É tude multi-e´chelle d'un lit fluidise´dense re´actif de type re´ge´ne´rateur FCC -Ce travail porte sur les e´coulements re´actifs gaz-particules tels que ceux que l'on rencontre dans la combustion du coke pour la re´ge´ne´ration des particules de catalyseurs de FCC. Les e´tudes re´alise´es pour de tels e´coulements montrent qu'en ge´ne´ral le taux de re´action global au cours du temps est mal pre´dit. La raison peut eˆtre lie´e a`la cine´tique chimique utilise´e qui est en ge´ne´ral base´e sur des expe´riences macroscopiques. Le lien entre des releve´s macroscopiques et une cine´tique chimique de re´action he´te´roge`ne locale qui a lieu a`l'interface meˆme entre la surface de la particule et le gaz environnant n'est pas imme´diat. Nous avons utilise´des re´sultats cine´tiques issus d'expe´riences afin d'identifier les proble`mes qui apparaissent lorsque l'on utilise cette meˆme cine´tique pour des e´chelles diffe´rentes. Une analyse multi-e´chelle est donc effectue´e. Nous montrons alors que la fraction volumique de particules a une influence sur le taux de re´action. Par ailleurs, nous montrons la ne´cessite´de de´velopper un mode`le de sous-maille pour le taux de re´action lie´a`la pre´sence de clustering dans les e´coulements gazparticules. Dans les calculs effectue´s couramment, le taux de re´action est calcule´en conside´rant une re´partition homoge`ne des particules a`l'inte´rieur de la maille de calcul. En effet l'analyse microscopique montre que lorsque les particules sont regroupe´es en nuages denses, la fraction massique de dioxyge`ne a`l'inte´rieur de ce nuage est rapidement nulle et donc le dioxyge`ne est en de´faut. La re´action he´te´roge`ne est donc limite´e.Abstract -Multiscale Study of Reactive Dense Fluidized Bed for FCC Regenerator -This study deals with reactive gas particle flows like the coke combustion during the regeneration of FCC particles. In this kind of reactive flow, the global reaction rate is usually bad predicted. In a first approximation, the chemical scheme can be the reason because of the limitation of its modeling. It is usually based on macroscopic experimental results. The link between these macroscopic measurements and a local kinetics of the heterogeneous reaction occuring at the gas-particle interface is not confirmed. Results of kinetics coming from experimental measurements are used and we try to highlight the problems that appear when the same kinetics are used at different scales. In common industrial computations, coarse meshes are used to solve continuity equations. Averaged or filtered Navier-Stokes and species continuity equations have to be solved in which additional correlation terms appear because of non-linear terms in the original equations, including reaction rate correlation. Therefore a multiscale analysis is performed in order to improve the modeling of this terms. This paper, shows that the eulerian formulation of kinetics has to be improved due to the impact Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 68 (2013), No. ...

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3D Unsteady Multiphase Simulation of Uranium Tetrafluoride Particle Fluorination in Fluidized Bed Pilot

Cited by 4 publications

References 4 publications

Unsteady three-dimensional theoretical model and numerical simulation of a 120-kW chemical looping combustion pilot plant

Unsteady three-dimensional theoretical model and numerical simulation of a 120-kW chemical looping combustion pilot plant

Determination of PVC powder drying kinetics at particle scale: Experimental study and modeling

Multiscale Study of Reactive Dense Fluidized Bed for FCC Regenerator

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