大颗粒气固流化床的流化特性

234Vol.23No.4200312JOURNALOFXIANUNIVERSITYOFSCIENCEANDTECHNOLOGYDec.2003:1671-1912(2003)04-0425-05X1,2,1,1,1(1.,710055;2.,710054):,:,,,;,,:;;;;:TP013:A1Fig.1Experimentequipment12A/D345678910,7000,,,,,,,38mm,1[13]1.11,,,;;,127mm1.2,,,,,1,2.1.33,,,X:2002-10-23:(50272050):(1969-),,,,.1Tab.1Distributionsizeofexperimentalmaterials0.63-0.90.9-1.251.25-1.61.6-2.02.0-3.23.2-4.04.0-5.05.0-6.36.3-7.07.0-8.18.1dp1///////3.210.678.66.27.202///0.00.356.838.74.2///3.9430.391.728.710.304.3043.713.43.484.6618.70.143.4243.220.975.8////////1.36:mm;::=6:3:1;dp;1.:3127,191254mm,L0=63.5mm,D0=2L0=127mm31,1.52,A/D,100/s202Tab.2Propertiesofexperimentalmaterialsp/kgm-3P/kgm-30Ar112207670.3717.1106213618500.382.81106312718800.311.721064\820.3\\:p;p;0;Ar22.1,,,WenYu[4],Remf=[C21+C2Ar]1/2-C1(1)Remf;C1C2Grace,C1=27.2C2=0.0408[5]3.3Tab.3Criticalvelocityofexperimentalmaterialsumf/ms-12L03L04L0umfumf(1)umf(3)11.511.621.531.551.761.4621.181.091.021.101.241.1230.951.131.021.031.091.003,12,WenYu13%C,(1)RemfAr,lgAr=1.956lgRemf+1.658,0.9989,Remf=0.142Ar0.511(2)umf=0.456d0.533pv0.022gp-gg0.511(3),13,,,3(1,24),,4,12,,,6242003,1.1732.2,GeldartD,,24321Fig.2Supperficialvelocity2pressureplottonumberone32Fig.3Supperficialvelocity2pressureplottonumbertwo43Fig.4Superficialvelocity2pressureplottonumberthree,,;,,,42.3,,54Tab.4MaximumoperatingfluidizingnumberinbubblingfluidizationN2L03L04L011.521.461.3021.871.581.3331.901.721.70:N5Tab.5Parameterofminimumslugfluidizedbedumsl/ms-1Pmsl/Pa(L/D)2L03L04L02L03L04L02L03L04L012.211.771.88918135919601.201.2012.022.251.471.351167168320641.571.571.573//1.46//2372//2.2:umsl;Pmsl.5Fig.5Velocity2pressureplotundersluggingfluidization:,u+=u-umfumf;P+=PH(p-g)g(1-mf)H;mf,0.4,;512,7244551),,,umsl,Leva,2),:22L0,1,,10.512,12D,,,122L0,,,3L04L0,;3)3,2L03L0,,4L0,123,,,[6],,,,,2.4Fan[7],,,68368,,,32L0,,2L03L0,,12,2L03L0,,67,3u+,12,,21,61Fig.6Pressurefluctuationofunmberone72Fig.7Pressurefluctuationofnumbertwo83Fig.8Pressurefluctuationofnumberthree3,3L04L0,u+2L0,,,,:,,,,,,,3,,824200331)WenYu,2),,1.31.93),,,,:[1]GeldartD.Typesofgasfluidization[J].PowderTechnology,1973,(7):285-292.[2]JF,D.[M].:,1981.141-143.[3]BakerCGJ,GeldartD.Aninvestigationintothesluggingcharacteristicsoflargeparticle[J].PowderTechnology,1978,(19):177-187.[4]WenCY,YuYH.Ageneralizedmethodforpredictingtheminimumfluidizationvelocity[J].AICHEJ,1966,12:610-612.[5],,,.[M].:,2001.[6]GuanglinSun,JohnRGrace.Effectofparticlesizedistributionindifferentfluidizationregimes[J].AIChEJ.,1992,38:716-722.[7]FanLTHotc,HiraokaS.Pressurefluctuationinfluidizedbed[J].AIChEJ,1981,27:388.Characterizationofgas2solidfluidizationwithlarge2particleLIXiao2guang1,2,XUDe2long1,XIAOGuo2xian1,FANHai2hong1(1.SchoolofMaterEng.,XianUniv.ofArch.andTech.,Xian710055,China;2.SchoolofMaterEng.,ChanganUniversity,Xian710054,China)Abstract:Byaseriesofcold2modeltest,characterizationofgas2solidfluidizationwithlarge2particleisre2searched,becausethekindoffluidizationmaybeusedtocalcinationsprocessinproducingcement.Ithasshownthatgas2solidfluidizedbedwithlarge2particleisstableinbubblingregimeandliabletosluggingfluidiza2tion,soithadbetterbeoperatedinshallowfluidizedbedandlowoperatingfluidizingnumber.Ithasknownbyanalysisofpressuredropfluctuationthatqualityoffluidizationcanbeimprovedwithwidersizedistributionparticle.Keywords:large2particle;fluidizedbed;bubblingregimes;sluggingregimes;dropfluctuation9244