Modelisation mathematique d un four rotatif de calcination d alumine

Dubois, Michelle

doi:10.1522/1525782

Cited by 5 publications

(6 citation statements)

References 4 publications

(4 reference statements)

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“…(8) present the confrontations of the numerical and experimental results for the product moisture and gases temperature. As mentioned by [29], the drying Fig. (3).…”

Section: Resultsmentioning

confidence: 90%

Recent Patent and Modelling of Phosphate Rotary Dryer

Raffak¹,

Mohamed²,

Mabsate³

et al. 2008

ENG

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We review recent patents on a phosphate rotary dryer, and we present in this paper two-fold. The first aim is the modelling of the phosphate rotary dryer and presentation of the dynamic model which we elaborated for the simulation. So far, no studies to investigate this have been reported. The second aim is to realize tests on the rotary dryer existing in Oued-Zem Complex of drying Khouribga-Morocco. In the present study, an improved numerical heat and mass transfer model has been developed for the rotary dryer used for drying the phosphate. The developed model is obtained on the basis of the equations of heat and mass transfer between the gaseous and solid phases. These equations are simplified by using suitable assumptions. The latter were validated by the tests carried out on the location. In order to better understand the behaviour of the product during drying process and to validate the mathematical model developed, we conducted tests on a rotary dryer installed in Oued-Zem Complex of drying. The purpose of these tests was the determination of phosphate humidity and temperature gas profiles along the dryer. The computer results show that the present model can predict the length of the dryer as well as axial solid and gas temperature distributions with reasonably good accuracy. The model developed is in a dynamic regime and it makes possible to take into account the thermal convective process, the porosity of the product as well as the generation of humidity. The results of the simulation of the model are compared with the experimental data.

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“…(8) present the confrontations of the numerical and experimental results for the product moisture and gases temperature. As mentioned by [29], the drying Fig. (3).…”

Section: Resultsmentioning

confidence: 90%

Recent Patent and Modelling of Phosphate Rotary Dryer

Raffak¹,

Mohamed²,

Mabsate³

et al. 2008

ENG

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“…The heat transfer coefficient between the external wall and ambient air (h 5 ) is given by Dubois [40]…”

Section: Modelling and Simulation In Engineeringmentioning

confidence: 99%

Modeling and Design of a Solar Rotary Dryer Bench Test for Phosphate Sludge

Ettahi

Chaanaoui

Vaudreuil

et al. 2022

Modelling and Simulation in Engineering

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As an eco-friendlier way to manage mining waste, the use of solar energy to dry phosphate sludge in a rotary dryer is envisioned. As a first step toward this end, a design study for a bench-scale rotary dryer for phosphate sludge is detailed, using a one-dimensional mathematical model developed for this task. Using the Engineering Equation Solver (EES) software, a steady-state transport phenomena model was developed that enables an estimation of the moisture and temperature profiles for both gas and product in the dryer. A sensitivity analysis evaluated the effects and influence of different geometric parameters and operating conditions on the product moisture profile. Parameters involved include the diameter of the dryer, the residence time of the product to dry, inlet air temperature, and inlet product humidity. This allowed for the selection of suitable design parameters for the operation of a phosphate sludge dryer with a 1.5 m length and an internal diameter of 11.5 cm. The inlet air temperature of the rotary dryer was set at 200°C to achieve a reduction of moisture content in the product from 30% to 7%. The model was validated through literature and experimental datasets, with an error averaging 0.22% and 1.52%, respectively.

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“…Le coefficient du transfert de chaleur, donné par [17][18][19], devient dans ce cas : Le coefficient de conduction est calculé par :…”

Section: Coefficient Du Transfert De Chaleur Et Surface D'échange Entunclassified

“…Le coefficient du transfert entre la paroi externe et le milieu ambiant est déduit par Dubois [19] : Bien que la méthode de Runge-Kutta d'ordre quatre ne soit pas rapide, sa robustesse et sa simplicité nous ont conduità l'adopter pour la résolution du système d'équations couplées de ce modèle.…”

Section: Coefficient Du Transfert De Chaleur Et Surface D'échange Entunclassified

Modélisation et simulation du four rotatif de séchage des phosphates

Raffak

Mohamed

Mabsate

et al. 2008

Mécanique & Industries

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-Ce travail porte sur l'élaboration d'un modèle mathématique, unidimensionnel en régime permanent, pour la simulation des fours rotatifs de séchage du phosphate. L'objectif du modèle est de prédire la température et l'humidité des gaz et du produit le long du tube sécheur, ainsi que la température des parois, interne et externe, dudit tube. Le modèle estélaboréà partir des bilans thermiques et massiques appliquésà des tranches fines du four en tenant compte d'hypothèses appropriées. Des essais ontété réalisés sur un four rotatif du Complexe de Séchage d'Oued-Zem (COZ) situéà Khouribga (Maroc). Le four aété equipé d'instruments nécessaires pour la réalisation de mesures au cours de son fonctionnement. Les essais ont porté sur la détermination de l'humidité et de la température du produit le long du tube sécheur. Ils ont permis de valider le modèle mathématiqueélaboré et de vérifier les hypothèses simplificatrices introduites lors de son développement.

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Modelisation mathematique d un four rotatif de calcination d alumine

Cited by 5 publications

References 4 publications

Recent Patent and Modelling of Phosphate Rotary Dryer

Recent Patent and Modelling of Phosphate Rotary Dryer

Modeling and Design of a Solar Rotary Dryer Bench Test for Phosphate Sludge

Modélisation et simulation du four rotatif de séchage des phosphates

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