Mass transfer characteristics in a three-phase fluidized bed containing low-density and/or small-size particles.

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  • 低密度粒子および小粒子を含む三相流動層の物質移動特性
  • テイ ミツド リュウシ オヨビ ショウリュウシ オ フクム 3ソウ リュウドウ

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Abstract

Experiments were conducted to investigate the mass transfer characteristics in a three-phase fluidized bed under conditions of gas-liquid upward flow in a column of 6.5cm inside dimeter and 157cm height. The particles employed were five kinds of low-density and small-size particles : nylon-6 particles with diameter of 6.32 and 9.52mm, polystyrene particles of 3.1 mm, activated carbon particles of 650μm and glass beads of 550μm.<BR>The three-phase fluidized beds showed two distinct regimes, i.e., the complete three-phase fluidization regime and the partial suspension regime in which some particles exist in the freeboard region, depending on gas and liquid velocities.<BR>The liquid-phase volumetric mass transfer coefficient, kLa, was calculated using the axial dispersion model together with the axial oxygen concentration profile.<BR>It was found that kLa increases with increasing gas velocities. This trend is almost the same as that in conventional three-phase fluidized beds and bubble columns, whereas the absolute values of kLa in the case of low-density particles are always larger than those for bubble columns. The behavior of kLa values is correlated as a function of gas holdup and the modified particle Reynolds number based on the density difference between particles and fluids.

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