Experimental Investigation And Simulation On Hydrodynamic And Mass Transfer Characteristics In Vibrated Three-phase Fluidized Bed

Three-phase fluidized bed is a system with high mass and momentum transfer efficiency. Great interface for mass transfer and unhindered bed were provided by turbulent flow. Gas-Liquid-solid fluidizations show great preponderance on deposal of pollution gas with some powder theoretically. Some underlying questions such as pockety flow, have kept Three-phase fluidized system from widely industrial applications for a long time. Wonderful industrial foreground of Three-phase fluidized system would be presented if some measures were taken.A set of vibrated three-phase fluidized bed experimental system was designed The hydrodynamics and mass transfer characteristics in vibrated three-phase fluidized bed were investigated. In this study, computer fluid dynamics (CFD) and dimensional analysis method were used to simulate the flow and calculation the gas-liquid volumetric mass transfer coefficient.In the research of hydrodynamics,bed pressure drop, bed expansion rate and average liquid holdup were investigated systematically. The results shew that the flow was greatly influenced by vibration. Inconspicuous improvements of fluidization quality were presented by low vibration intension, while negative influences produced by high vibration intension. In this study, a high point was achieved at the point of K=2.8.Some reasonable hypothesis were developed around Three-phase fluidized system, a series of close equations were established on the basis of Eulerian model.The coupling of pressure and velocity was analyzed by SIMPLE method., dispersed format was treated with finite volume, those equations were solved under planar symmetrical vertiginous condition. The simulation result presented the distributing rule of pressure, velocity, local phase holdup and turbulent energy in three-phase fluidized bed. While compared with actual experiment data, the model showed only 20% error rate.The mass transfer characteristics were studied by means of sodium hydroxide absorbing sulfur dioxide experiment, the results shew that volumetric mass transfer coefficient increased with liquid velocity, decreased with static bed height, increased with gas velocity at the beginning, then turn to steady. The empirical correlation composed of Reg, Sc, K and some analogical function was obtained while combined aforesaid equation with experiment data . The calculate result departure experiment data by only 20%.The feasibility of applying vibrated three-phase fluidized bed to gas absorption was proved. Eulerian model was proved available to study hydrodynamic characteristics in three-phase fluidized system. Theoretic foundation for industrial expands was provided by experiential correlative formula.