GAS CORONA TECHNOLOGY FOR TREATMENT OF VOC PAINT ....ppt

reductionofvocemissionsfrompaint boothoperationsusingdielectricbarrierdischarge30thenvironmentalandenergysymposium exhibitionsandiego caapril7 2004gregoryd hollandjohnn veenstraarlandh johannesgaryl foutchfreddiehall backgroundtheoklahomacityairlogisticscenter oc alc conductssurfacecoatingasregulatedby40cfr63 741inmaintenancepaintboothsatthefacility volatileorganiccompounds vocs areemittedasaresult whiletheemissionsrateiscurrentlywellbelowthestationarymajorsourcethresholdof10tonsperyear theselowemissionsaretheresultofusinglow voc low solidspaints backgroundthelow voc low solidspainthasperformedandweatheredpoorly andasaresult theplanesrequiremorefrequentpaintingaswellasconstanttouch ups anefficientmethodofemissiontreatmentisdesiredtoenablereneweduseofthebetterperforminghigh voc high solidspaints backgroundthetypicalemissionscontroltechniqueforsurfacecoatingsprayboothsiscarbonabsorption averagecontrolefficiency 90 carbonabsorptionhasafirepotentialinthecarbonbedwhenhighconcentrationsofketonesandalcoholsarepresentasattafb furthermore thepaintingoperationsattafbarenotcontinuousbutareofshortduration duetothisoperationalpattern atechnologywithan instant on instantoff capabilitywithoutaconcurrentstep upinemissionswouldbethemostefficienttreatmentfortafb backgroundtafbhascommissionedtheinvestigationofaninnovativetechnologytomeetplantandregulatoryrequirements agasphasecoronareactor gpcr alsoknownasadielectricbarrierdischarge dbd ornon thermalplasma ntp reactor isbeingdesignedtoreducevocemissionsfrompaintingoperations projectgoalsestablishoptimumoperatingconditionsusingbench scalestudies testcapacitylimitsfordesignandcostoffull scaleequipment collectstatisticallysignificantdatatoverifyvocdestructionanddetermineoperatingcosts twoweekoperationtestattinkerafbwithgreaterthan90 removalofvocsfromstackexhaust projectphasesphasei investigateoperationofdifferentreactorgeometries verifydestructioncapabilities investigateoperatingvariablesusingsingle tube bench scalereactors phaseii designpilot scalereactorfor1 000scfm multi tubedesign anddemonstrateunitattafb developtechnologydemonstrationplan phaseiii test1 000scfmunit determineeconomicandscale upfactorsfortheplasmaunit designfull scalereactorfor20 000cfm plasmadischargeprocesshighelectricfieldsareusedtogeneratehighenergyelectrons upto10ev whichcollidewiththegasmoleculestocreatehighlyreactiveionsand orfree radicals thedielectricbarrierpreventsthedirectflowofcurrentandpreventsexcessheating essentiallynowarm upperiodrequired allowing instanton capability on the fly adjustmentofpowertohandlevariationinvocloading dielectricbarrierdischarge phaseiinvestigateoperationofdifferentreactorgeometries verifydestructioncapabilities investigateoperatingvariablesusingsingleplasmazone bench scalereactors targetcomponents toluenemethylisobutylketonebutylacetatesec butylalcoholmethylpropylketoneethyl3 ethoxypropionate1 6 hexamethylenediisocyanategasmixtureactualstackgas operatingvariables reactorgeometryround square plateelectricfieldstrength16 18kvdischargefrequency200 400hzresidencetime0 05 0 2secondsvocconcentration35 250ppmhumidity0 80 relativehumidity flatplatereactor squaretubereactor singletubereactor singletubereactor figure3 plotofdestructiondata asconcentration forv 17kvrms f 300hz tres 0 1second andrh 0 run 04 figure4 plotofdestructiondata asafractionofinletconc forv 17kvrms f 300hz tres 0 2second andrh 70 80 run 40 phaseiresultsreactorgeometry singledielectricbarrier annulargap electricfieldstrength greaterdestructionathigherelectricfieldstrengths dischargefrequency greaterdestructionathigherdischargefrequencies residencetime greaterdestructionefficiencyathigherresidencetimes vocconcentration greaterdestructionefficiencyathigherconcentrations humidity improvesdestructionefficiencyofsomecomponents reducesdestructionefficiencyofothers humidconditionsimproveoveralldestructionefficiency mayincreaseenergyrequirements phaseiidesignpilot scalereactorfortreating1 000cfm multi tubedesign anddemonstrateunitattafb determineeconomicandscale upfactorsfortheplasmaunit developtechnologydemonstrationplan phaseii currentstatuscomparingenergyconsumptionparametersofdifferentsizereactorstodeterminescalingfactors single tubereactorwitha1to50cmplasmazone 10 tubereactorswith1 cmor5 cmplasmazonesineachtube difficultiesmeasuringthesecondarycurrent requirecustomizedcircuitry economicswilldependonenergyrequirementsandfinalsize 10 tubereactor acknowledgmentsoklahomacity airlogisticscentercenterforaircraftandsystems supportinfrastructure acknowledgmentsvijaykalpathi ph d student chemicalengineeringvisalakshiannamalai m s student electricalengineeringrajbarath p m s student environmentalengineeringelangovankaruppasamy m s student environmentalengineering questions table1 summaryofdestructiondataforresidencetimecomparisons table2 s