絮凝過(guò)程的流體動(dòng)力學(xué)研究.pdf

1、天津大學(xué)碩士學(xué)位論文絮凝過(guò)程的流體動(dòng)力學(xué)研究姓名：張育新申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：化工過(guò)程機(jī)械指導(dǎo)教師：康勇徐繼潤(rùn)20030101ABSTRACT。Inthispaperthegrain—distributionofFe203flocs，settlingvelocityandmoistureoffiltercakesweremeasuredandanalyzedundercertainhydraulicconditionsaccordin

2、gtothemicro—eddytheoryFirstly，theoptimaloperationalconditionswasobtainedafteraseriesexperiments：theconcentrationofFe203suspensionwithpH48is10％，thedosageoffiocculant，anionpolyacrylamide(32106)is3ppmSecondlytheexperimentso

3、fdesignedLlS237showthathydraulicparametersincludingmixingdirection，mixingrateandmixingtimeisimportanttothegraindistributionbutnottothemoistureThepercentofmoistureinthefiltercakesjSsteadybetween34％and36％ItiSfoandthatthest

4、irringdirectionshouldbechangeableandtheoptimalmixingtimeis30swith400rpm，then3minwith200rpmafterchangingdirectionWhat’Smore，boththeeffectsofalternativemixingrateongrain—distributionandrotatetimetocompactnessoffoesareobvio

5、usduringthesymmetricalalternativemixingIntheotherside，unsymmetricalalternativemixingisimportanttothecompactnessoffloeinsteadofthemoistureIntheend，itiSverifiedthatthetheoreticresultsobtainedfromsimplifyingthealternatemixi

6、ngisagreementwiththeconclusionsofexperiment，whichmaybebeneficialforthedesigningoffloceulatorandtheoperationofdewateringKEYWORDS：floeeulation，hydrodynamics，graindistribution，alternateivemixingThisprojeetisfinanciallysuppo