空气-SRNA-4催化剂磁流化床动力学研究  

Investigation into Hydrodynamics of Air-SRNA-4 Catalyst in a Magnetic Fluidized Bed

作　　者：赵亚南[1] 何晨晨[1] 张恺[1] 范秀凯 曹长青[1] 

机构地区：[1]青岛科技大学化工学院,山东青岛266042 [2]山东省化肥工业总公司,山东济南250013

出　　处：《青岛科技大学学报（自然科学版）》2010年第5期480-484,共5页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(20876079);山东省"泰山学者"建设工程基金项目(200510036)

摘　　要：在内径和高分别为140mm和1600 mm气固磁流化床反应器内,分别以空气和SRNA-4催化剂(平均粒径50μm)为气相和固相,采用不同外加磁场强度对磁流化床动力学进行了研究。应用计算流体力学软件FLUENT 6.2对磁流化床内局部固含率和床层压降进行了模拟计算。模拟结果显示:无磁场作用时,随表观气速增加,床层界面变化剧烈,床内局部固含率的分布极不均匀,床层压降升高。随着磁场强度增加,气泡的数目和尺寸减小,床中局部固含率增大,且分布变得较均匀,床层压降呈现下降趋势。模拟结果与实验数据吻合良好。Hydrodynamics of gas-solid magnetic fluidized bed reactor with inner diameter 140 mm and height 1 600 mm was investigated at different magnetic field intensities using air and SRNA-4 catalyst（the average diameter is 50 μm） as gas and solid phases,respectively.Local solid holdups and static pressure drop were systematically simulated using CFD code FLUENT 6.2 in the magnetic fluidized bed.The simulation results show that the profile of local solid holdup and interface fluctuation were more nonuniform at the absence of magnetic field.The static pressure drop became higher with increasing superficial gas velocity without magnetic field intensity.However,in magnetic fluidized bed,local solid holdup increases with the much more uniform distribution of local solid holdup,and number and size of bubble decrease with increasing magnetic field intensities.Further,the static pressure drop becomes low.The numerical simulations of static pressure drop agree with the experimental data.

关 键 词：SRNA-4 磁流化床 磁场强度 模拟 

分 类 号：O359[理学—流体力学]