基于新型无损检测仪的奥氏体锅炉管内壁氧化皮堵塞爆管探讨.docx

摘要：奥氏体不锈钢氧化膜脱落堵塞引起爆管的问题已严重威胁火电厂的运行，作者通过分析湘潭电厂采用传统的射线拍片检查和自主研发新型专用无损检测仪对管子进行检测的情况，突出新型专用检测仪具有检测准确快捷、灵敏度高、对被检测管子无要求的优点。并根据两台超临界锅炉的检测结果分析了氧化皮堵塞的特点，同时结合奥氏体锅炉管壁温度曲线变化，指出即使是滑压闷炉缓冷的锅炉也会发生氧化皮堵塞。从强化管理的高度率先提出并实施了将氧化皮检测纳入“四管”防磨防爆体系，在氧化皮问题上做到“逢停必查”，确保机组运行安全，为其他电厂处理此问题提供宝贵的实际经验。关键词：氧化皮；奥氏体不锈钢；无损检测；堵塞InvestigationforthepipeburstcausedbyoxideskinstrippingofffromausteniticstainlesssteelpipeinternalwallbasedonthenewtesterPengXinLiYouqingWangShuangyongRenJianwenXiangtanPowerGenerationCo.,Ltd1102Abstract:Theproblemthatpipeburstcausedbyoxideskinfromausteniticstainlesssteelpipe,whicstrippedofffromthepipesinternalwallandblockedthepipes,hasgreatlythreatenedthehealthyoperoaftipoonwerplants.TheauthoranalysedthetestingconditionofXiangtanpowerplant,whosesupercriticalboilersweretestedbytraditionalX-rayandthenewspecitesterself-developebdyXiangtanpowerplant,underlinedthespecialtesterhasadvantagesofhighsensitiviandno-requiremenfortheteste（pipes,theoperatioiwasalsosimpleandquickthenindicatedthefeaturesoftheoxideskinblockagebasedonthetestingresultsCombinedthetemperaturecurveofausteniticboilerpipe,thispaperpointedouttheboilerpipeswouldbeprobblockedbyoxideskineveniftheboilershutdownwithslidinpressurelnviewofstrengtheningmaintenancemanagement,Xiangtanpowerplantpresentedandimplementedthemeasurethatintegratedoxideskintestingwithanti-wearandanti-buTfstuisypiit^^KDcrtestedpipesassoonastheunitsshutteddownsoastomakesuretheunitsoperTahteesdesaelcsuoreplryo.videdvaluablepracticalexperienceforotherpowerplantsdealingwithsimilarproblems.Keywords:oxideskin;austeniticstainlesssteel;nondestructivetesting;block0引言目前，在国内外火力发电机组中，高温过热器不锈钢管内壁蒸汽氧化所引发的氧化层剥落造成管子堵塞爆管的现象时有发生。随着我国火电机组向超临界、超超临界参数发展，此类问题将会更为突出。虽然不少学者研究员经过探索取得了一定进展，但对彻底解决氧化皮的生长和剥落做到可控在控这一问题尚无定论，现已成为困绕电力行业的一个国际性难题。湘潭电厂二期扩建投产了两台6MW超临界发电机组，配备了东方锅炉（集团）股份有限公司生产的