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Article Dans Une Revue Chemical Engineering and Processing: Process Intensification Année : 2008

Hydrodynamic and solid residence time distribution in a circulating fluidized bed: experimental and 3D computational study

Résumé

Vertical profiles of local pressure, horizontal profiles of net vertical solid mass flux, and residence time distributions (RTD) of the solid phase are experimentally assessed in the riser of a small scale cold Circulating Fluidized Bed of 9 m high having a square cross section of 1111 cm. Air (density 1.2 kg/m3, dynamic viscosity 1.8×10-5 Pa.s) and typical FCC particles (density 1400 kg/m3, mean diameter 70 mm) are used. The superficial gas velocity is kept constant at 7 m/s while the solid mass flux ranges from 46 to 133 kg/m2/s. The axial dispersion of the solid phase is found to decrease when increasing the solid mass flux. Simultaneously, 3D transient CFD simulations are performed to conclude on the usability of the eulerian-eulerian approach for the prediction of the solid phase mixing in the riser. The numerical investigation of the solid mixing is deferred until later since the near-wall region where the solid phase downflow and mixing are predominant is not well predicted in spite of well-predicted vertical profiles of pressure.
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Dates et versions

hal-00467494 , version 1 (06-07-2023)

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Régis Andreux, Geoffrey Petit, Mehrdji Hemati, Olivier Simonin. Hydrodynamic and solid residence time distribution in a circulating fluidized bed: experimental and 3D computational study. Chemical Engineering and Processing: Process Intensification, 2008, 47 (3), 463-473 available on : http://oatao.univ-toulouse.fr/346/2/Andreux_346.pdf. ⟨10.1016/j.cep.2007.01.023⟩. ⟨hal-00467494⟩
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