Review of (gas)-liquid-solid circulating fluidized beds as biochemical and environmental reactors

Hydrodynamics of a gas-liquid-solid three phase circulating fluidized bed

삼상유동층에서의 물질전달 특성 = Mass transfer characteristics of three phase fluidized beds

Characteristics of Temperature Fluctuations and Heat Transfer in Liquid-Solid Circulating Fluidized Beds

Particle Image Velocimetry Investigations on Multiphase Flow in Fluidized Beds: A Review

The characteristics of three-phase (gas–liquid–solid) circulating uidized beds (TPCFBs) are discussed in order to visualize the unique features and advantages thereof due to the intrinsic ow and contacting behaviors of multi-phases, providing a better understanding of the state of art of TPCFBs and their feasible applications as multi-phase reactors and contactors. The hydrodynamics such as individual phase holdups, bubbling ow behaviors, bubble properties and liquid phase dispersions, and heat and mass transfer characteristics in the riser were examined based on the previous investigations. Although the information in the riser of various kinds of TPCFBs deviated from each other depending on the solid circulation modes and experimental conditions, they were summarized and consociated for the elucidation of the present states and views of the investigations. Rational guides to predict the hydrodynamics and heat and mass transfer phenomena in the riser of the TPCFB were possible by analyzing and synthesizing the results reported in the literatures presently available. Especially, the e ects of operating variables including gas (UG) and liquid (UL) velocities, properties of uidized solid particles and continuous liquid media, and solid circulation rate (Gs) on the hydrodynamic parameters and the heat and mass transfer characteristics such as heat transfer coe cient (h) and resistance, volumetric mass transfer coe cient (kLa), gas–liquid interfacial area (a) and liquid side mass transfer coe cient (kL) were determined. The information on the heat and mass transfer, however, were extremely limited comparing with those of hydrodynamics. Some correlations were suggested to predict the hydrodynamic parameters, and the values of h, kLa, a, and kL in the riser of the TPCFBs to provide insights for the present and future studies. The mechanism of heat and mass transfer and their modeling should be conducted for the better prediction of the performance of the TPCFB-reactors and contactors in the future.

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Si Woo Yang

Papers

Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds