循环流化床锅炉一次风进气管断裂失效分析龚嶷

PART:APHYS.TEST.),,,(1.,2433;2.,2437):,/FW(CFB),,,,:;;;;:T:B:10014012(29)010905FailureAnalysisonRuPtureofInletTubeinCirculatingFluidizedBedBoilerGONGYi,,YANGzhgUO,zHANGHh(1.DePartmentofMaterialsSeienee,FudanUniversity,S}langhai200433,China;2.ShanghaiResearehInstituteofMaterials,Shahai200437,China)Abstract:ASafetyevaluationontheperforationofnozzleandruptureofitsinlettubeinapetroloke/eoalfiredf,Weireulatingfluidizedbed(CFB)boiler,wasstudiedthnughfieldinvestigationsandsanlplinganalysis.Inordertoasoertainthemaineausesandthemeellanismsofthefailed,eharaeterizationanalysesandexPerimentssuehasehemiealeompositionandmetallographiestruetureinspeotion,maeroseopiemieroseopiemorpholoobservation,reeaedoutbymeansofphotoe]eetriedireetreadingspeetrometer,opticalmicroscope(OM),seannieleetronmieroseope(SEM)andeneydispersespeetrometer(E)S)onthefraeturesurfaeeofthefailurenozzleandt11)e.Finally,,asedontheanalysisresultthattheperforationofnozzlewaseausedbylocalizedablationatthedefeetintheweldedJointbetweenthenozzleandtheinlett-ube,andthebrittleruPtureoftheinlettubewasledbytheirlteraetionbetweenintergranulareorrosionanda;rasivewear,thepreventionmethodsandsuggestionswerePutforward.Keywords:eireulatingfluidizedbedboiler;rlozzle;inlett,lbe;intersranulareorrosion;abrasivewear,(CFB),,CFB,[lj:(984),,CFB,85950,,,,,20025/FW(FosterWheeler)CFB,109:(OM)(SEM)(EDS),,,,,[1(a)j,,1(b);,1(C)(d),,1CFB,,22.1,(a)(b)(c)(d)1Fig1Maemseopiemorphologyofnozzles(a)Lautofnozzlesinthebottomoffuruaee(b)Mohologyofnormalnozzles(e)Perforationoffadurenozzle(d)Fraetraphoflureinlettube1,GB/T64031992ZG3Cr25NiZo;,GB/T12211975ICrZoNil4SiZ[z],1(t)Tab.1Checaleompositionofnozzleandiettube(mass)%CCrNi51MoMn0.33236419.381.780.510.552(a),a;2(b),,,,2.0.54ZG3Cr25Ni200.20~0.350.500.222.O.ICr20Nil4SiZ24.Q~18.0~2822.021.0511.0019.0~12.022.015.01.50~2.50.50On.0OU2.21(d),11033.1,,,3,,10001200,850950,?3,,,Z:(b)2Fig.2Metallographiestrueturesofrupturedinlettube(a)Mierostrueture(b)Polishedstrueture3Fig.3MaCroseopiemorphologyofperforationinthenozzle,,3.2](d),,,,4(a),,,SEMEDS,4(b)(d)4(b),.5mm,50500m,2(b),4(c)(d),,3,3,,,,,,,,,1(d)3,,,CFB:¹;º;»CFB,1(d),,,,CFB,,,,,,Cr:,C3,(CTE),,111-:(b)SEM()0.0020(e),,,,,,,,,,,,CFB,,,,(RCHZCHZSH),,FesNis67,FeSNIS,,,CrZ:C6,,,,,rlwellLeel|LIm()()()90(l80070060050040()3()()2()0l00Sd†4()6)0E/keVeNiSiCrFe7206405604804()0240320l(,0SŽ2.()()4.0()keV(d)4EDSFig.4erographofthecrossseetionofinlettubeandEDSspeetruxn(a)Maeroseopicmorpholooferos,seetion(b)SEMPattern(e)EDSofrnatrix(d)EI5ofcorrosivelayer,1124(1)ZG3Cr25NiZoICrZoNi14SiZ,,,,(2),(3),,,(4),:¹,,;º,,::5][6],,.[C.:5.],2006:223227.,.CFB[J.,2007,32(51):170-173.,.[J.,2008,33(12):8992..[J.,2005,17(6):6770.J||†UOrweŒreeJ,,,.[Mj.:,26:4..M.:,2003..[M.:,2006:125126.,.CFB[J.,2006(7):68.lJI,esl.J119OAILrJllLL--L,,ICP,,,2010n,::(1);(2);(3);(4);(5);(6):,,:02165556775251,02155541227:02165539089:99,:200437