某超超临界机组锅炉T92钢管泄漏原因分析  

Reason analysis on leakage of T92 steel tube in an ultra supercritical boiler and the countermeasures

作　　者：李顺华[1] 胡平[1] 马庆增[1] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080

出　　处：《热力发电》2013年第1期94-96,共3页Thermal Power Generation

摘　　要：针对某超超临界机组锅炉二级过热器T92钢管泄漏问题,通过渗透检测、化学成分分析、力学性能测试、金相分析、扫描电镜及能谱分析等方法对其原因进行了分析,认为该钢管内壁在制造过程已产生裂纹,该裂纹在锅炉运行的高温高压条件下沿底部和端部扩展穿透整个壁厚,进而导致了泄漏。Leakage occurred on a T92 steel tube of two-stage superheater in an ultra supercritical boiler.Several tests such as penetration testing,chemical composition analysis,mechanical properties testing,metallographic analysis,scanning electron microscope(SEM) and energy spectrum were performed to find out the reason.The results showed that,the crack on inner wall of the tube had been already formed during manufacturing process,it spread along bottom and end of the tube under high pressure and temperature and finally passed through the entire wall causing the leakage.Some countermeasures were given.

关 键 词：超超临界机组 锅炉 T92钢管 泄漏 裂纹 

分 类 号：TG115[金属学及工艺—物理冶金]