1、浙江大學(xué)碩士學(xué)位論文組合槳?dú)庖簲嚢璺磻?yīng)器傳遞規(guī)律研究姓名：章兆波申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：高分子材料指導(dǎo)教師：馮連芳2001.3.1f●；_pr，‘l、SummaryGas—liquidstirredreactorsarewidelyappliedi11chemicalindustriesBecauseol。tileinnatecomplexityofgas—liquidsystems，tiledesignandscale—upofthi

2、stypeol’reactortireusuallydifficulttobecarriedoutIlowevermultipleimpellerstirredtankwiththehigherratioofheighttotankdiameterisdemandedforhighheattrailsfIersurlhceneeded，gasdispersion，masstrailsferandsoonIngeneralthemulti

3、pleimpellersystemisadvantageousforgas—liquidcontactingbecauseoftbefavorableresidencetimedistributionofthegasphaseascomparedwithasingleimpellersystemoftbesamevolumeFurther，thepowerconsumptionperimpellerdecreaseswithanincr

4、easeinthenumberofimpellersandincreasestheuniformityofenergydissipationThemoststudiedandconventionallyusedimpellersarediscturbinefDr)impellers，whichgiveverygoodgasdispersionandhencegoodmasstransferrates、butarealsoresponsi

5、bleforunevendistributionofenergyieintheregionclosetotheimpelleritisveryhigh(almost25timesthebulkenergydissipationrate)comparedwiththebulkliquidregionDiscturbineimpellersalsequirehighpowerperunitvolumetogeneratesimilarbul

6、kliquidvelocitiesAdditionally，asrequestsofgasliquiddispersionprocessforflowpatternofeachimpelleraredifferentcommonlyAllofthesedisadvantagescarlbetackledbytheuseofappropriateimpellercombinationsTheinvestigationdescribedma

7、inlyinthispaperiSdevotedtotwolab—scalegas—liquidagitatedtanksconsistingofmultipleimpellersmountedonasingleshaftandtwoindividualshahsrespectivelyMorecomprehensivestudiesonthecomparisonofpowercharacteristic，gasdispersionan

8、dtransferperformancewithvariousimpellercombinationsforgas1iquidagitatorsaremadeinthisthesisGas—liquiddispersionandmixingprocesslargelydependontheflowpatterninastirredtankEliminatingthecompartmentsordecreasingtheareaofcom

9、partments，thusenhancingthemasstransferbetweencompartmentsiSthebasisofstudyingtheflowfieldofmultipleimpellersTheflowfield，dischargingflownumber叫口d)offiveimpellersandnineimpellercombinationsaremeasuredbymeansofLaserDoppler

10、Anemometer(LDA)，therelationsofNqdwithdifferentimpellers，bladenumber，impellerdiameter，impellerwidthandbafflesarealsoacquiredMoreover，threeimpellersinasingleshaftareanalyzedfromviewsofflowfieldOneofthebasicquantitiescharac

11、terizinggas—liquidreactoristhepowerconsumptionKnowledgeofthedependenceofthepowerinputonoperatingconditionsgivesausefulinsightintotheprocessFirstly，theungassedpowerconsumptionofthreeimpellertypes，namelyflatbladeturbine(FB

12、T)，pitchedbladeturbine(PTD／PTU)anddiscturbine(DT)weretestedandcomparedwithformulaFordifti：rentdiameterimpellercombinations，newpowerequationisproposedbyusingmixingsetup((b776mm)thateachimpellercanrotateindependentlySecond