吹氩钢液精炼过程气泡去夹杂机理研究

43620086IronandSteelVol.43,No.6June2008,(,110004):,,,:,,:;;;:TF769.4:A:04492749X(2008)0620025205MechanismofInclusionRemovalFromMoltenSteelbyBubblesDuringtheRefiningProcessWithArgonBlowingZHENGShu2guo,ZHUMiao2yong(SchoolofMaterialsandMetallurgy,NortheasternUniversity,Shenyang110004,Liaoning,China)Abstract:Aphysicalmodelwasestablishedbychoosingemulsiondropssimulatedasinclusionstostudythemecha2nismofinclusionremovalfrommoltensteelbybubblesduringtherefiningprocesswithargonblowing,andtheeffectofoperationparametersoninclusionremovalwasinvestigated.Theresultsshowthatboththesmallerandthelargergasflowratesseemedtobeefficientforinclusionremoval.Theinclusionsaremainlyremovedbyattachmenttobubblesatsmallergasflowrateandmainlyremovedbycaptureinthewakesbehindbigbubblesatlargergasflow2rate.Keywords:argonblowing;secondaryrefiningofmoltensteel;inclusionremovalbybubbles;physicalmodel:(50274022,50674020):(19792),,,;E2mail:[e-mail];:2007210231,[15],[68][9],,11.1300t,19,,,[10],11.2,,SahaiEmi[11],1Table1Mainparametersofmodel,prototypeandtheirmedia/mm/mm/mm/(kgm-3)1)/(m3h-1)4100377542257.1103()3.9103(Al2O3)2.7103(SiO2)1.784()5704564194691.06103(NaCl)1.046103()1.205()1.1910-216.6310-21)T=273K,p=1.013105Pa43,Rinc,mRinc,p=0.251-inc,pst1-inc,mw0.5(1),R,m;,kg/m3;mp;inc;st;w()90,,[3]Al2O3SiO2114115,;,(1),,,,11=1/91(1)Al2O3:Rinc,mRinc,p=Dinc,mDinc,p=3.37(2)SiO2:Rinc,mRinc,p=Dinc,mDinc,p=3.95(3)(2)(3),D,m1Fig.1Diagramofcollisionandaggregationamongseveralinclusions2,379m,(2)(3)112.5mAl2O395.9mSiO21.33(1/2R),1.1910-216.6310-2m3/h100mL(),50/cm3(),,,,,,:k=ki=1VtiV0(4)2(a)(b)Fig.2Morphology(a)andinitialsizedistribution(b)ofemulsiondrops626:,kk;V0,m3;Vtii,m3;tii,,;,2(),,,,50/cm3()3Fig.3Schematicoftheexperimentalsetup22.145,(1.1910-23.5610-2m3/h),8min,(4.7510-216.6310-2m3/h),16min,16min,4.7510-2m3/h,,;14.2610-2m3/h16.6310-2m3/h,2.22.2.1,,6[2]Wang[1],2,3:(6(a)(b)),2mm;(72436(c)(d)),,;(6(e)(f)),,,,,(5),(a)1.1910-2m3/h;(b)3.5610-2m3/h;(c)4.7510-2m3/h;(d)7.1310-2m3/h;(e)14.2610-2m3/h;(f)16.6310-2m3/h6Fig.6Behaviorsofbubblesattypicalflowrates2.2.2,,(6(e)(f)),,7,,,,,,,3,7Fig.7Schematicofbubblewake,,(2mm,6(a)(b)),[15],,,,,,(4.7510-2m3/h),,(6(c)),,(6(d)(e)(f)),,,,,;,(6(e)(f)),(14.2610-216.6310-2m3/h)(1.1910-23.5610-2m3/h):826:,;,,23(1)(1.1910-23.5610-2m3/h)(14.2610-216.6310-2m3/h)(2)(1.1910-23.5610-2m3/h),;(4.7510-216.6310-2m3/h),(3),,,:[1]WANGLai2hua,LeeHG,HayesP.PredictionoftheOpti2mumBubbleSizeforInclusionRemovalFromMoltenSteelbyFlotation[J].ISIJInt.,1996,36(1):7.[2]ZHANGLi2feng,TaniguchiS.FundamentalsofInclusionRemovalFromLiquidSteelbyAttachmenttoRisingBubbles[J].IronandSteelmaker,2001,28(9):55.[3],,,.[J].,2003,39(4):431.(XUEZheng2li2ang,WANGYi2fang,WANGLi2tao,etal.InclusionRe2movalFromMoltenSteelbyAttachmentSmallBubbles[J].ActaMetallSin,2003,39(4):431.)[4],,,.[J].,2005,17(3):34.(WANGLi2tao,XUEZheng2liang,ZHANGQiao2ying,etal.ArgonBlowingandInclusionRemovalinLadleFurnace[J].JournalofIronandSteelResearch,2005,17(3):34.)[5]WANGLi2tao,ZHANGQiao2ying,LIZheng2bang,etal.FundamentalofInclusionRemovalFromMoltenSteelbyRis2ingBubble[J].JournalIronandSteelResearchInternation2al,2004,11(6):5.[6]SÊderM,JÊnssonP,JonssonL.InclusionGrowthandRe2movalinGas2StirredLadles[J].SteelResearch,2004,75(2):128.[7]WANGLi2tao,ZHANGQiao2ying,PENGShi2heng,etal.MathematicalModelforGrowthandRemovalofInclusioninaMulti2TuyereLadleDuringGas2Stirring[J].ISIJInt.,2005,45(3):331.[8]SHENGDong2yuan,SÊderM,JÊnssonP,etal.ModelingMicro2inclusionGrowthandSeparationinGas2StirredLadles[J].ScandJMetall,2002;31(2):134.[9].-[M]..:,2006.[10],.[M].:,1998.[11]SahaiY,EmiT.CriteriaforWaterModelingofMeltFlowandInclusionRemovalinContinuousCastingTundishes[J].ISIJInt.,1996,36(9):1166.(21)[5]WillmottAJ,HinchcliffeC.TheEffectofGasHeatStorageUponthePerformanceoftheThermalRegenerator[J].Int.J.HeatMassTransfer,1976,19(8):821.[6]MuskeKR,HowseJW,HansenGA,etal.HotBlastStoveProcessModelandModel2basedController[J].JournalofIronandSteelInstitute,1999,76(6):56.[7]MuskeKR,HowseJW,HansenGA.Model2BasedControlofaThermalRegeneratorPart1:DynamicModel[J].Comput2ersandChemicalEngineer,2000,24(11):2519.[8],.[J].,2005,5(5):490.(HURi2jun,CHENGShu2sen.NumericalSimulationofCoolingAirDistri2butionofBottomCavityoftheRegeneratorinaCowperStove[J].TheChineseJournalofProcessEngineering,2005,5(5):490.)[9],,,.[J].,2005,12(40):17.(ZHAOMin2ge,HURi2jun,CHENGShu2sen,etal.InfluenceofBlastPipingonColdAirFlowDistributioninBlastChamberinInternalCombus2tionHotStove[J].IronandSteel,2005,12(40):17.)[10],.[J].,2006,4(28):338.(HURi2jun,CHENGShu2sen.NumericalSimulationofHotGasVelocityDistributionintheTopDomeofAnInternalCombustionHotStove[J].JournalofUniversityofScienceandTechnologyBeijing,2006,4(28):338.)[11].[M].:,1991.92