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1、IHIGH-TEMPERATURECORROSIONINGASTURBINESANDSTEAMBOILERSBYFUELIMPURITIES.PARTVIII.EVALUATIONOFTHEEFFECTSOFMANGANESE,CALCIUM,ANDSEVERALHEAVYMETALSONCORROSIONANDSLAGFORMATIONWalterR.May,MichaelJ.Zetlmeisl,RobertR.Annand,DavidF.LaurenceTRETOLITEDIVISION/PETROLITECORPORA
2、TION,369HarshallAvenue,St.Louis,NO.63119INTRODUCTIONTherearetworecognizedapproachestocontrollingvanadiccorrosion.Bothresultintheproductionofdry,non-adheringandthereforenon-corrodingslags.Themorewidelyacceptedapproachistheformationofhighermeltingcompoundsintheslagvi
3、afueladditives.Theotherapproachutilizeslowexcessairoperatingconditionswhichproducehighermelting,lowervalencestatevanadiumcompoundsandlessSO3whichreucessulfateintheslag.Inearlierstudiespresentedinthisseriesofpapersq,wehaveexaminedmagnesium,silicon,aluminum,andcombin
4、ationsoftheseelementsasadditivsManyelementshavebeentriedasadditiveswithvaryingdegreesofsuccess5-6.Thedifficultyinobtainingsufficientdatatothoroughlyevaluateanadditivepartiallyexplainsthepaucityofinformationoncombinationsystems.Ourelectrochemicalapproachtomeasuringc
5、orrosionratescoupledwiththestepwiselinearregressionanalysisofthedatahelpsfillthisgapandoffersarapidbutthoroughscreeningofanadditivesystem.Thetechnologyinthisarea,particularlyforgasturbines,hasbeentowarduseoflowerqualityfuelsandhighertemperaturesforbetterefficiency.
6、Theresulthasbeenademandforanadditivewithbettersodiumandtemperaturetolerances.Inthelastpaperinthisseries',wepresenteddataonthemagnesium-aluminum-siliconsystemwhichshowedconsiderablepromiseinthisarea.Inthispaper,wearepresentingdataobtainedonseveralothersystemsofinter
7、est.Manganeseimprovescombustionefficiencywhichpermitslowerexcessairoperation''.Availablecommerciallyarecombinationswithmagnesiumand/orsilicontopermitlowexcessairoperationwherepossiblewiththemagnesiumand/orsiliconpresenttoinhibitslaggingandcorrosionintheconventional
8、manner.Thepurposeofthestudyonmanganesewastofindifithasanyinhibitingeffectsintheconventionalmannerorinterfereswithmagnesiumand/orsilicon.Thepurpos
