气固流化床中声发射和流动模式关系

《气固流化床中声发射和流动模式关系》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、万方数据第58卷第7期化工学报Vol·58No．72007年7月JoumalofChemicallndustryandEngineering(China)July2007=盎=一=；=====；=======；===================；；==========掣一气固流化床中声发射和流动模式关系王靖岱1，曹翌佳1，任聪静1，阳永荣1，侯琳熙2(，浙江大学化学工程与生物工程学系，化学工程联合国家重点实验室(浙江大学)，浙江杭州3l0027；2宁波大学材化学院，浙江宁波315211)关键词：声发射；能量；气固流化床；流动模式

2、；聚乙烯颗粒中国分类号：TQ021．9文献标识码：A文章编号：0438—1157(2007)07—1713—06Measurementofacousticemissionsandflowpatterningas—solidfluidizedbedwANGJin舛ail，CAoY萄i0．RENCoII西il蜡，YANGY(1De夕n以优F行￡o，C，lP优ic口z口行dBiof，lP优ic口z臣hgi咒gP一竹g，S缸把KeyLn60埘幻ryo，(、^P优icnzE玎gi拜eeri竹g'Z_fI巧iⅡ，lgUhivPrsi￡了，Hn7

3、lgzho乱310027，Zh巧ia咒g，C^i住口；2Sc^oDZo，(冼e，扎imZ点：以g砌PPri咒g口卵dM口￡Pr缸如Sfi朋c已，Ni卵g幻miw坶缸y，N锄960315211，铂巧妇咒g，吼i撇)Abstract：Theflowpatternofafluidizedbedisakeyfactorforheattransferandnewreactordesign．Theflowpatternofthegas-solidfluidizedbedwasexperimentallymeasuredbyanovelacous

4、ticemission(AE)technique-Theacousticenergygeneratedbythecollisionofs01idsparticlesonthereactorwallor1nthe10calspaceisareflectionofthespeedandfrequencyofcollision，andconsequentlythenowpatternofparticles．Theflowpatternofp01yethyleneparticleswiththeaveragesize460弘mina≯150

5、mmfluidizedbedintherangeofsuperficialgasvelocityfromO．3m·s一1toO．7m。s_1wasmultl-clrculatlonpatternwithmain—circulationzone，sub—circulationzoneandstagnantzone．Themulti—circulationflowpatternwouldtransittothesin91ecirculationflowpatternifsuperficialgasVelocityexceededO·8m

6、’s一1oraverageparticlesizedecreasedtobelow365pm．Theheightofstagnantzoneremainedunchangedwlththeincreaseofstaticbedheight．ItwasalsofoundthatthetypeofthedistributorhadaneVidenteffectonflowpattern．Thesinglecirculationflowpatterninthefluidizedbedwithaperforatedstainlessstee

7、lplatedistributorwouIdchangetothemulti—circulationnowpatternforthesameparticlesandthesamenuidizedbedwithacon}shapeddistributor．AnempiricalequationcalculatingtheheightofstagnantzonewaspresentedandtheeXperimentaldatacouldbecorrelated、jl，iththeempiricalequationw．thfairlyg

8、oodaccuracy·Kevwords：acousticemission；energy；gas—solidfluidizedbed；flowpattern；polyethyleneparticle引言流化床气相聚合技术具有众多的优点