Study On The Characteristics Of Flow And Mass Transfer In Upflow Magnetically Stabilized Bed

According to the need of amorphous alloy SRNA-4 as catalyst in the industry process of hydrogenating reaction, a new up-flow magnetically stabilized with diameter of 110mm has been proposed, in which different diameter particles of SRNA-4 were used as solid, water as liquid and compressed air as gas. The characteristic hydrodynamic, liquid dispersion and mass transfer have been studied.The photoelectric sensor and micro double probe have been used respectively to get the solid holdup and gas holdup, drawing the conclusion that the solid holdup increases with increase of the magnetic field intensity, and decreases with the increase of superficial liquid velocity and liquid viscosity, the axial of radial distribution of solid holdup is uniformity. The gas holdup increases with the increase of superficial gas velocity, magnetic field intensity and liquid viscosity and magnetic field intensity, decreasing with the increases of liquid surface tension, the axial distribution of gas holdup is uniformity. In the experiment, the pressure drop and phase velocity has also been also considered, the minimum fluidization velocity and carryover rate increase with the increase of magnetic field intensity. The electrolyte tracer method has been used to measure the liquid dispersion coefficients. Drawing the conclusion that in the LSMSB the liquid dispersion coefficients increase with the increase of superficial liquid velocity and diameter of particles, decreasing with the increase of liquid viscosity, the radial distribution of liquid dispersion coefficients are uniformity. In the GLSMSB, the liquid dispersion coefficients increase with the increase of superficial liquid velocity and gas velocity, while decreasing with the increase of liquid viscosity and liquid surface tension.With the electrochemical method, liquid solid mass transfer coefficients have been gained. Compared to conventional fluidized bed, the mass transfer coefficients in MSB are smaller. And they decrease with the increase of magnetic field intensity and liquid viscosity, in the magnetic stabilized regime, liquid velocity has nothing to do with the mass transfer coefficients. The axial or radial distribution of mass transfer coefficients is uniformity. In the GLSMSB, the mass transfer coefficients have slightly decreased with the increase of magnetic field intensity, liquid viscosity and liquid surface tension. The axial or radial distribution of mass transfer coefficients is uniformity. What is mentioned above is essential for the design, operation and control of magnetic stabilized bed.