上流磁稳定床流动与传质特性的研究

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1、天津大学硕士学位论文上流磁稳定床流动与传质特性的研究姓名：卢立祥申请学位级别：硕士专业：化学工程指导教师：张金利20040101中文摘要根猫日目晶态合金催化剂SRNA一4猩工业加氢殿应过程中的黼蔡，以不间粒度的SRNA-4王她催倦裁蔻湖楱、求必渡勰、空气免气襁，在垂110mm戆上流式黻稳定露孛，对滤髂力学饕蛀、滚摇扩数狱获滚嚣黉囊凳经蓑蒡了磺究。分别采用光电传感器和微型双针电阻探头测缀了床层的围含率和气含攀，研究缩采表明床屡的固含奉随磁场强度的增大而增大，陵表观液速和液体鞍度驰增大丽减毒，其褒辍径逮努奄魄较翡每；凑豢懿

2、气客奉随裘理气逮、磁场强凌纛渡髂靛囊增加丽增翮，随表谣强力瀚增热而减小，其在径淘上分布韬：竣溜向。考察了藤层的压降和相遴廉随操作条彳牛和物性参数的变化规律，试验过程中煨小流化速度和带出速度均随磁蛹强度的增热霭嵫丈。采薅孵褒赢添暴踩浚溅囊了蠢矮液赣扩鼗系数，磷究蘩慕表臻菠蓬疆稳宠庆豹液相轴向扩散系数随表观液速和颗粒救径的增大筒增大；随液体粘度和磁场强度的增加面减小，液稿轴向扩散系数在径随上分布比较均匀。气液园磁稳定床中波幅扩鼗篆数隧衮蕊滚逮帮气滚鳆溪太嚣璞大，菠装蒜靛魔窝褒嚣张力熬罐丈嚣藏小。采溺电能学方法溺患了床层的滚

3、褥传质系数，研究结果袭鹇谨滚瘸磁稳翘床中液固传质浆数较普通流他床要小，且随磁场强度和液体粘度的增加而减小；粳磁链区搽{牟，液遮慰抟瘊系数没袁影噙；抟矮系数在辘凝海上分农垮留。在气液戳磁稳定采孛，滚露簧蒺系数隧磁绣强囊、渡蒋糖麦零表嚣强力懿壤期聪路霄鬣，j、，在籀径向上分布均匀。美键淫：疆激庭廉，囊薅力攀蒋篷罐鑫搴，攘逮囊，滚挺扩羧，滚辫镑震—鼍鐾STR矗￡TAccordingtotheneedofamorphouSalloySRNA一4ascatalyst讯theindustrYprocessofhydrogenati

4、ngreaction，anewup-flowmagneticallystabilizedwithdiameterof110mmhasbeenproposed,inwhichdifferentdiameterparticlesofSRNA-4wereused曩ssolid,water然liquidandcompressedair8sgas．Theeharaeterlstiehydrodynamic,iiqmddispersionand臻#鬟stransfcrhavebeenstudied．Thephotoelectric

5、sensorandmicrodoubleprobehavebeenusedrespectivelytogetthesotldhoIdup越匹gasholdup,drawingtheconclusionthatthesolidholdupincreases碰逸increaseofthemagneticfieldintensity,anddecreaseswiththeincreaseofsuperficialliquidvelocityandliquidviscosity,theaxialofradialdistribu

6、tionofsolidholdupisuniformity．飘egasholdupincreaseswiththeincreaseofmalta-tidalgasvelocity,niagneticfieldintensityandliquidviscosityandmagneticfieldintensity,decreasingwiththeincreasesofliquidsurfacetension，theaxialdistributionofgasholdup18uniformity,Intheexperim

7、em，thepressuredropandphaseveloc姆hasalsobeenalsoconsidered，theminimumfluid缝atiOnvelocityandcarq．,ovcrrateincreasewiththeincreaseofmagneticfieldintensi每．Theelectrolyteh--aeermethodhasbeenusedtomeasuretheliquiddispersion∞e舔cients．DrawingtheconclusionthatintheLSMSBt

8、heliquiddispersioncoefficientsincreasewiththeincreaseofsuperficialliquidvelocityanddiameterofpa蟋des,decreasingwiththe{ncre韪seofliquidviscosity,theradialdistributionof