某发电厂分隔屏过热器管泄漏分析  

Analysis on Leakage of Separating Screen Superheater Tube in a Power Plant

作　　者：刘润飞 赵强 刘俊建 邵明义 杜晓东[1] LIU Runfei;ZHAO Qiang;LIU Junjian;SHAO Mingyi;DU Xiaodong(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,Anhui China;Datang Boiler and Pressure Vessel Inspection Center Co.,Ltd.,Hefei 230088,Anhui China;Anhui Electric Power Co. ,Ltd. ,Huainan Tianjia’an Power Plant ,Huainan 232000 ,Anhui China)

机构地区：[1]合肥工业大学材料学院,安徽合肥230009 [2]大唐锅炉压力容器检验中心有限公司,安徽合肥230088 [3]安徽电力股份有限公司淮南田家庵发电厂,安徽淮南232000

出　　处：《热处理》2019年第5期35-39,共5页Heat Treatment

摘　　要：某发电厂6号炉分隔屏过热器管发生泄漏。对泄漏的过热器管进行了宏观检查、金相检验和硬度检测。结果表明:水平夹持管的焊缝硬度远高于母材,产生了较大的焊接应力;补焊部位长期运行后组织恶化,受到蒸汽的吹损而减薄,导致其泄漏。最终管子在漏点处蒸汽喷射的反作用力下发生断裂。Leakage occurred in separating screen superheater tube in furnace No.6 of a power plant. The leaking superheater tube was subjected to macro check , metallographic examination and hardness measurements. The results showed that hardness of the horizontal clamping pipe weld was much higher than that of the base metal , thus leading to larger welding stress;and that the place where repairing welding was accomplished exhibited poor microstructure after long-time operating , and was thinned due to steam impingement , thus resulting in its leakage. Finally , the tube fractured at leakage point by reacting force of steam injecting.

关 键 词：过热器管 15CRMO钢 TP347H钢 爆管 

分 类 号：TG157[金属学及工艺—热处理]