大型生物质直燃锅炉高温受热面腐蚀问题分析

44220133BOILERTECHNOLOGYV0144No2Mar2013(510600)3ClS2TKl6B16724763(2013)020056050135[1-2][3-4]-6]220th()(SUS31612CrlMoV)22mm10(SUS31638mm5mm)11111-8mm4mm2320121020(1973)2jL_j_574291wt312(4)4KMgNaFeCa[7-8]3Cl128242049KMgNaFeCaCl2824267289429972049()()221PDA70002SUS316CrNiCrNi222(56)576(a)(b)4456(a)(b)331S3400N77SEM8SEM180zm805mm32EDAXApolloX(910)9933CrMoC13210104Cl4434C1K4ClL10|ClCl-FeCr300ClSUS316(oCrl7Nil2M02)MoClClC1SO(KNa)5(1)CrNi(2)CrMo(3)Cl6044[1][J]200828(29)105110E2][J]200828(2)4348r3]PetterssonAAmandLESteenariBMChemicalfractionationforthecharacterisationofflyashesfromCOcombustionofbiofuelsusingdifferentmethodsforalkalireduction[J]Fuel200988(9)17581772[4]VamvukaDZografosDAlevizosGControlmethodsfor[5]mitigatingbiomassashrelatedproblemsinfluidizedbeds[J]BioresourceTechnology200899(9)35343544ChristensenKFormationofsubmieronparticlesfromtheAnalysisofHigh-temperatureinLarge-scalecombustionofstraw[J]JournalofAerosolScience199526(4)691r6]SrikanthSSwapanKDRavikumarBeta1Natureoffire-sidedepositinabagasseandgroundnutshellfired20MWthermalboiler[J]Biomass&Bioenergy200427(4)375384[7]]2009(6)3642[8][J]2004(2)4953[9]HJ548--2009IS]2009[10][J]2010(5)1418HeatingSurfaceCorrosionProblemsBiomassfiredBe|orSONGJinghuiHUPing(ElectricPowerResearchInstituteofGuangdongPowerGridCorporationGuangzhou510080China)AbstractWiththeconcernsoverenergyshortageandC02emissionbiomassisnOWbeingconsideredasaninexhaustibleandcleanenergyresourceallovertheworldThebiomassmaterialforpowergenerationinSouthChinamainlycomesfromagriculturalandforestrywastessuchassugarcanebagasseeucalyptusleaveseucalyptusbranchesetcThiskindofbiomassfuelscontaininherentinorganicelementsincludingsulfurandchlorineaswellasminorquantitiesofSiA1CaFeMgandPespeciallycontainhighcontentofpotassiumelementThecorrosionprobleminthehightemperatureheatingsurfaceofalargescalebiomassfiredboilerinSouthChinawasinvestigatedintheworkThesuperheaterpositioningtubehadbeencorrodedseriouslyafterrunningjustforthreemonthsByobservationthecorrodedsurfacewascharacterizedbytheruptureandpeelingoftheoxidefilmoftheouterwallAndthecorrosionextendsinwardalongthegrainboundarybymetallographicanalysisThemorphologyandelementsexistinginthecorrosionsamplewasstudiedbyscanningelectronmicroscope(SEM)combinedwithBrukerEDXMicroanalysisResultsshowthatahighcontentofC1SandAlkalimetalexistsinthecorrosionproductsItwasconsideredthatunderhightemperaturecombustionconditionalkalimetalrelatedcompoundsmightreleasetothegasphasethenreactwiththemetaloxidefilmandevenemitC12whichcanpenetratetheoxidefilmandreactwiththealloycausingmoreseriouscorrosionThehighchlorineandalkalicontentofbiomasscomingfromthecoastalwasthoughttobethemainreasonscausedhightemperaturecorrosionofsuperheatertubewallKeywordsbiomassfiredgenerationhightemperaturecorrosionalkalimetalchlorineCorroSlon