搜索
712Vo.l7,No.12200612TechniquesandEquipmentforEnvironmentalPollutionControlDec.2006Carrousel范 茏1 陈大方2 王志强1 刘艳臣1 施汉昌1*(1.,100084;2.(),100083) (PDA)Carrousel,。,,,。、、,,,,。,,,。 Carrousel (PDA) X52;O359 A 1008-9241(2006)12-0036-06StudyonflowcharacteristicofCarrouseloxidationditchFanLong1 ChenDafang2 WangZhiqiang1 LiuYanchen1 ShiHanchang1(1.StateKeyJointLaboratoryofEnvironmentalSimulationandPollutionControl,DepartmentofEnvironmentalScienceandEngineering,TsinghuaUniversity,Beijing100084;2.DepartmentofChemistryandEnvironmentalEngineering,ChinaUniversityofMiningTechnology(Beijing),Beijing100083)Abstract TheflowinanexperimentalCarrouseloxidationditchwithtwosurfaceaeratorslikeinverseum-brellawasmeasuredwithparticledynamicanalyser(PDA).Itwasobservedthattherewasnegligibledifferencebetweentheflowvelocitiesofsolidandliquidphases,whilethesettlingvelocityofsolidwasabitlargerthanthatofliquidduetoinertialeffec.tTheinfluencesofthespeedofaerators,thelocationofaeratorsrelativetothesur-faceandtheheightoftheoxidationditchwereinvestigated.Withtheincreasingofaeratorspeed,thevelocitycameup.Thedeepertheaeratorsintheliquid,thelargerthevelocity.Whentheoxidationditchwashigher,thevelocityatthesamelocationbelowthesurfacewoulddecrease.TheexperimentalresultswerealsocomparedwiththoseobtainedinawastewatertreatmentplantofHuaibeicity.Theywereingoodagreemen.tThisgivesevidencethattheexperimentalresultspresentedinthispapercouldbeusedforpractice.Alltheseresultswillplaysignifi-cantrolesinthedesignandoptimizationofoxidationditch.Keywords Carrouseloxidationditch;flowcharacteristic;particledynamicanalyser(PDA):“863”(2004AA601060);:2005-11-22;:2006-01-20:(1976～),,,:、。E-mail:fanlong@tsinghua.edu.cn* 1954,。,,,,,。Stamou[1]、。Clercq[2],,。[3],Carrousel。[4],。Carrousel,,。,Carrousel[5],。12 :Carrousel,、、[6]。1,,,,,,,,、。,Carrousel,[7,8]。1 Fig.1 Sketchofsurfaceaeratorlikeinverseumbrella。,,。[9]、、[10]、[11],,(PIV)、(LDA)、(PDA),,。LongFan[12]PIV,。[13]。[14]PDA,。[15],PDA。PDACar-rousel。1 1.1 Carrousel50∶1。120mm,144mm,746mm,。1.2 (particledynamicanalyser,PDA)。,、,。PDA:PDA。Dantec58N50PDA,、、、、、。PDA[16～18]:22θ,。U,,fDU:|U|=[λ/(2sinθ)]fD:λ—,m。,。PDA,。1.3 1～1.5mm,1.1g/cm3,,,,,,1.07g/cm3,200～400,1.59。,,2,PDA。1500,4min,0～30mm,30mm。2 2,,。、。2、3,5,x36mm、186mm、336mm、486mm636mm,54,,y=1377mm、30mm、60mm、90mm120mm,z5mm、15mm、60mm98mm。2 ()Fig.2 Schematicofexperimentaloxidationditch(planform)3 ()Fig.3 Schematicofexperimentaloxidationditch(sideview)2.1 ,3(Re、)。,Re,,,,(Fr=ugdh,dh),150r/min。2.2 4～7150r/min,,,。,,。,,。 2.3 60r/min、150r/min、200r/min600r/min4,。,120mm,。8～11,,,。4 yFig.4 Comparisonofflowvelocitybetweensolidandliquidinyaxis5 xFig.5 Comparisonofflowvelocitybetweensolidandliquidinxaxis6 yFig.6 Comparisonofsettlingvelocitybetweensolidandliquidinyaxis4,x,。(x=36mm),,;(x=336mm),,。,,。3812 :Carrousel7 xFig.7 Comparisonofsettlingvelocitybetweensolidandliquidinxaxis8 (y)Fig.8 Influenceofaeratorspeedonflowvelocity(inyaxis)9 (x)Fig.9 Influenceofaeratorspeedonflowvelocity(inxaxis)2.4 ,。,,10 (y)Fig.10 Influenceofaeratorspeedonsettlingvelocity(inyaxis)11 (x)Fig.11 Influenceofaeratorspeedonsettlingvelocity(inxaxis)5mm5mm2,,()。12150r/min,,。,13,,。2.5 110mm130mm,120mm,。14、15150r/min,,。,,,,。39712 Fig.12 Influenceofaeratorslocationonflowvelocity13 Fig.13 Influenceofaeratorslocationonsettlingvelocity14 yFig.14 Influenceoftheheightofoxidationditchonflowvelocityinyaxis2.6 16Carrousel2000,6,9m,5m,43(0.5m、1.5m3m)。150r/min(17),0.1、0.30.67,5mm、60mm98mm120mm0.04、0.50.8,、,,,。15 xFig.15 Influenceoftheheightofoxidationditchonsettlingvelocityinxaxis16 Fig.16 Resultsofwastewatertreatmentplant17 Fig.17 Resultsoftheexperiment2.7 ,、,4012 :Carrousel,,,,,。,、,。,,:(1),。(2),,。(3),,,,,。3 PDA,、、,,,。:(1),,,,;(2),y,。,、。,;(3),,;(4),、、。[1]StamouA.I.Modellingofoxidationditchesusinganopenchannelflow1-Dadvection-dispersionequationandASM1processdescription.Wat.Sc.iTech.,1997,36(5):269～276[2]ClercqB.D.,CoenF.,VanderhaegenB.,VanrolleghemP.A.Calibratingsimplemodelsformixingandflowpropa-gationinwastewatertreatmentplants.Wa.tSc.iTech.,1999,39(4):61～69[3],,..,2004,33(11):22～25[4],,,..,1998,24(2):12～17[5],,.Carrousel.,2002,28(2):19～21[6],,..,2002,28(10):67～71[7],..,2003,19(9):83～85[8],,,.2000.,2004,20(11):101～103[9]RhodesM.J.Asimplenon-isokineticsamplingprobefordensesuspensions.PowderTech.,1992,70:141～151[10]FaschingG.E.Capacitivesystemforthree-dimensionalim-agingoffluidized-beddensity.IEEETransactionsonIn-strumentionandMeasurement,1994,43(1):56～65[11]TillenkampF.,LothR.Phasedistributionmeasurementsduringtransientbubblytwo-phaseflowinaverticalpipe.Chem.Eng.Tech.,2000,23(4):347～352[12]LongFan,ZaishaMao,YundongWang.Numericalsimula-tionofturbulentsolid-liquidtwo-phaseflowandorientationofslenderparticlesinastirredtank.Chem.Eng.Sc.i,2005,60(24):7045～7056[13],,..,2004,22(2):196～200[14],,..(),2005,45(8):1088～1090[15],,,.PDA.,2004,38(7):1209～1213[16]..:,1990.141～159[17]RashidiM.,HetsroniG.,BanerjeeS.Particle-turbulenceinteractioninaboundarylayer.Inter.J.MultiphaseFlow,1990,16(6):935～959[18].(PDA).,1996,17(1):61～6641