432934 Experimental and Numerical Study in the Inlet Region of a Circulating Fluidized Bed

Friday, November 13, 2015: 8:30 AM
254A (Salt Palace Convention Center)
Caroline B. Strey1, Jonathan Utzig2, Rodrigo K. Decker3, Dirceu Noriler3, Vinicyus R. Wiggers3, Waldir P. Martignoni4, Henry F. Meier3 and Jonathan Utzig3, (1)Regional University of Blumenau, Blumenau, Brazil, (2)Department of Chemical Engineering, Regional University of Blumenau, FURB, Blumenau, Brazil, (3)Department of Chemical Engineering, Regional University of Blumenau, Blumenau, Brazil, (4)Petrobras, Rio de Janeiro, Brazil

The behavior of the gas-solid flow in a riser was evaluated by means of an experimental and numerical study. Axial velocity measurements for the both phases were conducted at the inlet region in a cylindrical riser of a cold-flow circulating fluidized bed (CFB) bench unit. The riser has an internal diameter of 0.104 m, a height of 2.4 m and the region where measurements were taken is made by Plexiglas. The side inlet used for catalyst feeding is positioned 0.5 m above the gas inlet and makes a 45° angle with the riser axis. The investigations were performed at different heights for five operational conditions, namely: the clean flow, two superficial gas velocities and two constant mass flow rates. Particle- and gas-phase velocities were acquired by means a Laser Doppler Anemometry (LDA) probe at profiles aligned with solids inlet and at 90° from it. Numerical simulations were performed by Computational Fluid Dynamics (CFD) techniques and compared with the experimental data obtained. For the gas-solid flow the Eulerian approach was applied. The gas-phase turbulence was modeled by the dispersed k-ε model and the solid phase model applies the Kinetic Theory of Granular Flow (KTGF), employing the energy minimization multi-scale (EMMS) drag model. Numerical results showed a good agreement with the experimental data and a partial validation of the mathematical model was achieved.

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