Hydrodynamics of Air-Catalysts of SRNA-4 in Magnetically Stabilized Bed
ZHANG Jin-li~1,WU Yue-jiang~1,MENG Xiang-kun~2,ZONG Bao-ning~2(1.School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;2.Research Institute of Petroleum Processing,SINOPEC,Beijing 100083,China)
(1.School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;2.Research Institute of Petroleum Processing,SINOPEC,Beijing 100083,China
Abstract：
Pressure drop,minimum fluidized velocity,solid holdup,local solid holdup distribution and gas phase backmixing are fundamental to the scale-up design and optimization of gas-solid(G-S) magnetically stabilized reactors.In this article,the hydrodynamics were studied using the pressure drop method,the photoelectric method and the transient point source tracer pulse input technique for the G-S magnetically stabilized bed taking the ferromagnetic amorphous alloy catalysts of SRNA-4 as the solid phase.The minimum fluidized velocity and the related bed voidage were observed to be independent of the magnetic field.The radical distribution of the solid holdup was uniform,and the local solid holdup increased owing to the inhibition of the particle movement by the magnetic field.However,increasing the superfacial gas velocity can promote the expansion of the GS bed,and decrease the solid holdup.For small particles,Pe number did not change greatly as the magnetic field and gas velocity changed,while for large particles Pe number decreased as the magnetic field increased,and the increase of magnetic field made the Pe number increased at the beginning then followed by decreasing.Based on the experimental data,the correlated equation was obtained to estimate accurately the minimum fluidized velocity,solid holdup and bed height.
ZHANG Jin-li~1,WU Yue-jiang~1,MENG Xiang-kun~2,ZONG Bao-ning~2.Hydrodynamics of Air-Catalysts of SRNA-4 in Magnetically Stabilized Bed[J]. Chemcial Industry and Engineering, 2007,24(5): 377-380
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2007, Vol. 24 
