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1、第31卷第6期热处理技术与装备Vo.l31,No.62010年12月RECHULIJISHUYUZHUANGBEIDec,2010设备废热锅炉的焊缝热处理及泄漏原因分析与修复潮道明(安徽盈创石化检修安装有限责任公司安徽安庆246001)摘要:E-406废热锅炉,是安庆石化炼油厂硫磺回收设备之一,三类压力容器。锅炉主体的壳体材料为20g26mm钢板,换热管为45mm5mm的20钢管加表面扩散型渗铝。经过整体焊后热处理。最后管子和壳体的气密性及水压试验完全合格。开车几天后,炉管产生严重泄漏。打开箱体,发现管口焊缝多处有微裂纹。经打磨焊
2、缝发现:管子和管板间角焊缝的根部有未焊透和少量气孔与金属夹杂物,造成局部缝隙高温高压汽体膨胀隔热与泡沫腐蚀。而未去除干净的少量渗铝层,在氩弧焊接时有形成焊接气孔、金属夹杂物和结晶裂纹的倾向,以及出口尾气中H2S、SO2等气体腐蚀而加速管子和管板间焊缝的开裂。经现场打磨并重新采用电弧焊接修复后,使用至今一年多,一切工况正常完好。关键词:废热锅炉;焊缝;泄漏;修复中图分类号:TG404文献标识码:A文章编号:1673-4971(2010)06-0059-06HeatTreatmentofWeldedSeamandAnalysisandRep
3、airofLeakageaboutWasteHeatBoilerCHAODaoming(AnhuiYingchuangPetrochemicalMaintenanceandInstallationCo.,Ltd.,AnqingAnhui246001,Chuna)Abstract:E406wasteheatboilersisoneofsulfurrecoveryequipmen,tthethirdtypeofpressurevesse,linAnqingPetrochemicalRefinery.Theheatexchangepipeis20s
4、teelpipe(45mm5mm),andthematerialofboilerbody(shell)is20g26mmsteelplatewhichisaluminiziedwithdiffusiontypeinsurface,andisheattreatedafterwholewelding.Finally,airtightnesstestingandhydraulicpressuretestingarefullyqualified.Runningafewdayslaterthefurnacetubecausesseriousleaka
5、ge.Openingthecabine,ttherearemanymicrocracksatthenozzleofweldseam.Polishedweldseam,therearepartofnotweldingfullyandsmallamountofmetalinclusionsandairholesatangularweldseambetweentubeandplate,bringaboutinsulationexpansionandfoamcorrosionofhighpressureandhightemperaturevaporin
6、thelocalaperture.Therearethetendencyofformingweldingairholes,metalinclusionsandcrystalcracksinnotcleanedsmallamountofaluminizinglayerwhenTIGwelding,aswellastheweldseamsarecorrodedbyH2S,SO2etcintailgasofexpor,ttoacceleratecrackingofweldseambetweentubeandshee.tTheboilerhavebee
7、nallconditionnormalintactafterrepairedbyonsiteburnishingandarcweldingagainformorethanoneyear.Keywords:wasteheatboilers;weldseam;leakage;repaire收稿日期:2010-07-20作者简介:潮道明(1953-),男,主要从事金属材料热处理工作。联系电话:13685562654;E-mai:lcdm1953@sina.com60热处理技术与装备第31卷0前言E406废热锅炉是我公司2008年8月为安庆石化
8、炼油厂二联合装置制造的;是石化炼油厂硫磺回收设备之一,三类压力容器。管内通高温尾气,壳体内通水蒸汽。因此,本废热锅炉又称之为火管式废热锅
