Hydrodynamic Study of Gas-Solid Internally Circulating Fluidized Bed Using Multi-Phase CFD Model

Gujjula, R and Mangadody, Narasimha (2015) Hydrodynamic Study of Gas-Solid Internally Circulating Fluidized Bed Using Multi-Phase CFD Model. Particulate Science and Technology. ISSN 0272-6351

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Abstract

Hydrodynamic study of gas and solid flow in an internally circulating fluidized bed (ICFB) is made in this study using the CFD multi-phase model. 2D and 3D computational meshes were used to represent physical ICFB geometries of 0.186 m and 0.3 m diameter columns. The model approach uses the two-fluid Eulerian model with kinetic theory of granular flow options to account particle-particle and particle-wall interactions. The model also uses the various drag laws to account the gas-solid phase interactions. The 2D simulation results by various drag laws show that the Arastoopour and Gibilaro drag models predict the fluidization dynamics in terms of flow patterns, void fractions and axial velocity fields in close agreement with the Ahuja et al (2008) experimental data. 3D simulations were also carried out for a large scale ICFB. The effect of superficial gas velocity and the presence of draft tube on solid hold-up distribution, solid circulation pattern, and gas bypassing dynamics for the 3D ICFB investigated extensively. The mechanism governing the solid circulation and the pressure losses in an ICFB has been explained based on gas and solid dynamics obtained from these simulations. Predicted total granular temperature distributions in 3D ICFB draft tube and the annular zone are qualitatively in agreement with the experimental data. The total granular temperature tends to increase with increasing solids concentrations and decrease with an increase of solids concentration.

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