静电集尘器的设计手册

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1、Lecture6DesignofESPDESIGNOFELECTROSTATICPRECIPITATORIntroductionAnelectrostaticprecipitator(ESP)isaparticlecontroldevicethatuseselectricalforcestomovetheparticlesoutoftheflowinggasstreamandontocollectorplates.Theparticlesaregivenanelectricalchargebyforcingthemto

2、passthroughacorona,aregioninwhichgaseousionsflow[1].INFORMATIONREQUIREDFORDESIGNINGOFESPTheefficiencyofanESPdependsupontwofactorsThesizeoftheuniti.e.totalsquareft.ofthecollectingplateareaAmountofindependentelectricalenergisationInadditionfollowingdetailsarereq

3、uiredfordesigninganESP1.Sourceoftheemission:Propertiesoftheprocessbywhichthepollutantsareproduced2.Particlesizedistribution3.Chemicalanalysisofdustinrelationtoparticlesize4.Specificeclecticresistivityofdust5.Dustconcentrationofcleangas6.Requireddustconcentration

4、ofcleangas(efficiency)7.Propertiesofgas:composition,temperature,pressure.8.Corrosivepropertiesofgas9.GasflowrateApartfromthesevariablesthedesignofESPalsoincludethedeterminationofancillaryfactorssuchasrapperstoshakethedustloosefromtheplates,automaticcontrolsystem

5、,measuresforensuringhigh-qualitygasflow,dustremovalsystem,provisionsforstructuralandheatinsulationandperformancemonitoringsystem[2].Firstlysizedistributionofdustisdetermined;fromtheinformationofsizedistributionofdustthemigrationvelocityiscalculated.Afterthatnumb

6、erofchargeonaparticleiscalculatedbyusingappropriateequation.OnthebasisofprecipitationratethecollectingsurfaceareaforagivenefficiencyataparticularflowrateiscalculatedbyusingDeutsch-Andersenrelationship.PARTICLECHARGINGAccordingtokinetics,theelectronenergyQdofanor

7、iginallyneutraldustparticleisgivenby[3]:dKT2dCNeQnepln1Pd2E2KT(2.6.1)-23Where,N=numberofelectroniccharges;dp=dustparticledia.;K=1.38*10(J/K);-191/2T=AbsoluteTemp.;E=1.602×10[C]–electrons;N=freeiondensity;C=(2kT/mi)Chargingvelocityisv

8、eryfastatthebeginningbutslowdownwithtime.2QndPedNeCt(2.6.2)4FieldCharging:92Qne0.1910rEfP(2.6.3)Where,n=Numberofelectroniccharge;rp=Radiusofparticle;E=Av