废热锅炉气体入口弯头失效分析

44220074PROCESSEQUIPMENT&PIPINGVol144No12Apr12007(,064412)::3OO,H2Fe3C,CH4,,,:;;;:TQ055.8:A:100923281(2007)0220062202FailureAnalysisforBendatGasInletofResidueHeatBoilerLiChao(HebaiQiananChemicalFertilizerCo.,Ltd,Qianan064412)AbstractThecausesofexplosionoccurredinthebendoftheinletpipelineinresidueheatboilerwereanalyzed.Theresultshowedthatwhenthebendworksat300foralonetime,H2reactswithC2orFe3CandcreatesCH4sothatthematerialisdecarbonizedandthecrackmayforms.Inthisway,thestrengthofthebenddecreaseandthematerialbecomesbrittle,whichfinallyleadtoexplosion.Keywordsresidueheatboiler,bend,explosion,hydrogencorrosion:2006204220:(1971),,20026200472#2#127mm21mm,()2#320,28MPa,N2H2NH3,,15CrMo;,20G,2OG20011.1(),,R=3DA,360mm,60mm,BC,ABC,;A,,,,,;21mm1.2ABC,:,13mm,2/3(21mm),,;1.3V()(3)GB647928620Ak39J,20GAk8.5J20J14J1/51/32,Fe3CH2CH4,:2H2+Fe3C3Fe+CH42H2+CCH4,,,,,,,,,,,,,,,,,100,,,:200,,320,20G,,:N2H2,,,3(1),,(2)320,,,,,(3)10MoWVNb,(4),,(41)(2),,;(3),,(4),,6(1),(56t),,,(2)(),,,,:200000N,:130mm(3)(),[1].[M].:,1983.36200741