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1、TemperatureStabilityinCoatingPotsasaFunctionofPowerSupplyTechnologyBillRovinsDirectGalvanizingHeatingTechnologiesInductothermCp.RancocasNewJerseyU.S.A.PresentedattheTheSecondBaosteelBiennialAcademicConferenceMay252620063
2、1.BACKROUNDMostofthechannelpotsinexistencetodayusetapchangertypepowersupplies.Thistypeofpowersupplyusestheionoftapsonanautotransfmertoprovidediscreetchangesinpowerlevel.Onehightaponelowtapareedsuchthattheybrackettheavera
3、gepowerrequirementfthegivenlineconditions.Acontactcyclesbackfthbetweenthetwotapsasdictatedbyatemperaturecontrollerusingfeedbackfromabaththermocouple.Becausethecontactisanelectromechanicaldeviceithasafinitelifespan.Thisim
4、posesapracticallimitonthedegreeofbathtemperatureregulationavailabletypically3degreesC.Otherwiseprematurefailureofthecontactispossible.Solidstatepowersuppliesoffersteplesscontrolwithouttheuseofmovingparts.Thisprovidesahig
5、herdegreeofreliabilityalongwithahigherdegreeofbathtemperatureregulationbecauseoftruePIDcontrol.Regulationofthebathtemperaturetowithin1degreeC.iseasilyachievable.2.BATHSAMPLINGMETHODIndertoverifytheauth’shypothesisbathtem
6、peraturemeasurementsweretakenintwochannelcoatingpotsrunningwithsimilarlineconditions.Onepothadthreeinductspoweredbysolidstatepowersuppliestheotherpothadtwoinductspoweredbytapchangerpowersupplies.Acomparisonofthelinecondi
7、tionsappearsinthetablebelow:Table1ComparisonofLineParametersfTwoPotswithDifferentTypesofPowerSuppliesPropertyPotwsolidstatep.s.Potwtapchangerp.s.AlloyGIGIIngotSize2400lbs.(1091kg)1130kgStripwidth60.38”(1534mm)1200mmStrip
8、thickness0.035”(0.89mm)0.5mmLinespeed385FPM(117mmin.)145mmin.Coatingweight67gm2eachside60gm2eachsideStriptemperatures.p.880?F.(471?C.)500?C.Bathtemperatures.p.865?F.(463?C.)460?C.Thetype‘K’thermocoupleswerepositionedinth
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