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# DYNAMIC MODEL FOR PHOSPHATE ROTARY DRYER

DOI: 10.1615/ICHMT.2008.CHT.1000
8 pages

Tarik Raffak
UFR MCICM, École Mohammadia d'Ingénieurs, Mechanical Department, Mohammed V Agdal University, B.P. 765 - Rabat Agdal - Morocco

Mohamed Agouzoul
UFR MCICM, École Mohammadia d'Ingénieurs, Mechanical Department, Mohammed V Agdal University, B.P. 765 - Rabat Agdal - Morocco

Mustapha Mabsate
UFR MCICM, École Mohammadia d'Ingénieurs, Mechanical Department, Mohammed V Agdal University, B.P. 765 - Rabat Agdal - Morocco

Abdellah Chik
CERPHOS - OCP group - 73, Bd Moulay Ismaïl, Casablanca - Morocco

OCP (Office Chérifien des Phosphates) Morocco

## Abstract

In this paper, we present a mathematical model of a rotary dryer of the phosphate. The numerical results are compared with the measurements carried out on the phosphate rotary dryer of the COZ (drying complex of Oued-Zem - Khouribga - Morocco). The dynamic model is developed from the conservation equations of heat and mass transfer. These equations are simplified by using appropriate assumptions which are validated by the measurements. This unsteady model includes variation of the product porosity and takes into account the thermal and mass diffusion processes. The comparison of the numerical results and the measurements is very satisfactory.

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