Wuhan Univ. Introduction to Ozone Generation and Its Applications(lecture)

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1、IntroductiontoTheOzoneGenerationandItsApplicationstoTheEnvironmentalTechnologySagaUniversityFacultyofScienceandEngineeringDepartmentofElectricalandElectronicEngineeringChobeiYAMABE（山部　長兵衛）CharacteristicsofOzone(O3):1)Ozoneisoneofthestrongestoxidants.2)Noundesirableby-productsresidue

2、sareformed.freeradicalsoxydationreductionpotentialfluorine(F2)2.87eVhydroxyl(OH)2.81eVatomicoxygen(O)2.42eVozone(O3)2.07eVhydroperoxide(H2O2)1.78eVchlorine(Cl2)1.36eVMajorapplications:Removaloforder,coloranddisinfection1)Treatmentofdrinkingwaterandwastewater.2)Bleachingprocesses(pap

3、erpulp).3)Oxidationstepinvolvingozoneisalsobeinginvestigatefordioxinsremovalfromfluegasinincineratorplants.AOT(AdvancedOxidationTechnology)suchascombineduseofO3/UVisappliedforthetreatmentofdioxinswhichareexudedfromafinalplacefortheindustrialwastes.Studiesarerequiredfor1)highozonecon

4、centration:gO3/Nm32)highefficiency:gO3/kWh3)compactsizeDifferenttypesofreactors1.Dischargeinsidethebubblesinwater2.DCpositivestreamercoronaa)dischargeconditioningb)seriesgapeffect3.Superimposedtypea)surfacedischargeandDCb)surfacedischargeandbarrierdischarge4.Doubledischargetype5.Rot

5、atingelectrodetypeFactorswhichinfluenceonozonegeneration:1)Rawgas:(oxygen,airwithorwithouthumidity)2)Gasflowrate:(specificpowerW/Q=electricinputpower/gasflowrate)3)Producedozoneconcentration:ratioofoxygenatom[O]vs.oxygenmolecule[O2]4)Operatingpressure:optimumoperatingconditionisdete

6、rminedbytheproductpandd.Where,p:operatingpressure,d:gapdistance5)Coolingtemperatureforthegas6)Electricaldischargecharacteristicsofozonizertube:capacitanceofdielectricmaterial,thermalconductivity,insulatingstrength7)Gapdischarge:d,pdproduct,generationinair8)Electricalinputpower9)Appl

7、iedvoltage10)Operatingfrequencyofelectricalpowersource:Inputpowerincreaseswiththefrequencyofpowersource(itmeanstobecompact),anddielectriclossalsoincreases.従来型オゾン発生器の基本構造Fundamentalstructureofconventionalozonizer(ozonegenerator)放電管の基本構造Coaxialtubetypeofozonizer微小放電電流の測定Measurementoft

8、hemicro-dischargecu