空气重介质流化床流化特性及密度梯度分布研究-张翠玉

203Vol.20No.320145CleanCoalTechnologyMay2014467002。7.10cm/s510Pa1.71～1.74g/cm3。7.95cm/s15～25mm1.72、1.74、1.74、1.74、1.73g/cm3。1.74g/cm3。7.95cm/s。TD94A1006－6772201403－0012－04FluidizingcharacteristicsanddensitygradientdistributionofairdensemediumfluidizedbedZHANGCuiyuBeijingHuayuEngineeringCo．Ltd．ChinaCoalTechnologyandEngineeringGroupPingdingshan467002ChinaAbstractToseparatematerialeffectivelyinvestigatethefluidizationcharacteristicsofmixedmediumsanddensitygradientdistributionofairdensemediumfluidizedbedusingmixedmediumofmagnetitepowderandglasssphericparticles．Theexperimentalresultsshowthatairdensemediumfluidizedbedcanformauniformandstablefluidizationstate．Whenthefluidizingairvelocityisabove7．10cm/sthepres-suredropofbedcanholdaround510Pathebeddensitystabilizebetween1．71g/cm3and1．74g/cm3．Whenthefluidizingairvelocityis7．95cm/sthebubbledistributedevenlyinthebedwiththediameterof15mmto25mm．Theaveragedensityofeachflooroffluidizedbedis1．721．741．741．741．73g/cm3fromtoptobottom．Onthetopareaoffluidizedbedthemicro－fineglasssphericparticlescanbecarrieduptothesurfaceofbedbyflowingvaporanddecreasethedensityoftoparea．Thegasisevenlydistributedonthebottomofbedanddecreasethedensityofthebottomarea．Theaveragedensityofmostareais1．74g/cm3．Sowhenthefluidizingairvelocityis7．95cm/sthereisnoobviousstratificationandclassificationphenomenon．Theresultsshowthatthemixedmediumwithevenlydensitycreategoodconditionsformaterialseparationofairdensemediumfluidizedbed．Keywordsairdensemediumfluidizedbedmixedmediumfluidizationvelocitydensitygradient2013－12－26DOI10．13226/j．issn．1006－6772．2014．03．0041983—。[e-mail]sanddensitygradientdistributionofairdensemediumfluidizedbedJ．CleanCoalTechnology201420312－15．0“”、、、。1－4。21201435－9。。、。。。11.13、。278mm×176mm×450mm。、、、。、。、U。U。1。11.2。。2.36、1.14g/cm332.40%1.93g/cm30.18mm。1。1/mm/%+0.3000.730.300～0.2507.430.250～0.20034.750.200～0.15020.840.150～0.10532.560.105～0.0742.10－0.0741.59100.0022.1。。10－11①②。ρb=ΔPgΔh1ρbg/cm3Δhmmgm/s2。ρb'=M10SH2ρb'g/cm3MgScm2Hmm。312014320。U。2。2/cm·s－1/Pa/mm/g·cm－3ρbρb'00265.001.901.901.42125.00265.001.901.901.99175.00265.001.901.902.84255.00265.001.901.903.41295.00265.001.901.903.97345.00265.001.901.904.54390.00265.001.901.905.11440.00265.501.901.905.68495.00267.001.891.895.96490.00276.001.831.836.25525.00280.501.791.806.53500.00283.001.731.786.81510.00287.001.731.767.10510.00289.001.731.747.38510.00290.001.731.747.66510.00291.001.731.737.95510.00292.001.731.738.23510.00293.001.731.728.52510.00294.001.731.719.08510.00294.501.731.719.65505.00295.001.721.7127.10cm/s510Pa1.71～1.74g/cm3。ρb'。ρbρb'。ρb1.73g/cm3ρb'。12－13。2.27.10～9.08cm/s510Pa。。280mm5a、b、c、d、e280、220、160、90、30mm。1575。7.95cm/s23a、b、c、d、e3。23x/mmy/mm/g·cm－3abcde109581.721.751.751.721.7259581.731.751.751.721.750581.731.751.751.751.72－59581.731.731.731.731.75－109581.701.751.771.771.7710901.721.731.731.751.755901.731.751.751.751.72001.731.731.751.731.72－5901.731.751.751.751.75－10901.721.751.721.751.72109－581.731.731.731.731.7359－581.731.751.751.771.730－581.701.731.751.751.72－59－581.721.731.751.751.72－109－581.721.731.731.751.721.721.741.741.741.734120143337.95cm/s15～25mm。1.72～1.74g/cm31.77g/cm3。1.72、1.74、1.74、1.74、1.73g/cm3。aeb、c、d1.74g/cm3。7.95cm/s。367.60%32.40%17.10～9.08cm/s1.71～1.74g/cm327.95cm/sa、b、c、d、e1.72、1.74、1.74、1.74、1.73g/cm3。1．21J．2001306527－530．2．J．2003634－40．3．J．200222136－39．4．J．2006539－42．5．———J．200110512－14．6．J．200531970．7．J．20121851－5．8FranklandSC．DrybeneficiationofcoalM．HarwellLaboratoryCoalＲ＆DProgramme1996．9SahuAKBiswalSKParidaA．Developmentofairdensemediumfluidizedbedtechnologyfordrybeneficiationofcoal－areviewJ．InternationalJournalofCoalPreparationandUtilization2009294216－241．10．J．19916697－703．11．M．2001103－115．12．M．200296－103．13．D．2001．51