某超超临界机组锅炉水冷壁管泄漏分析  

Leakage Analysis on Waterwall Tube of Ultra Supercritical Unit Boiler

作　　者：王伟[1] 何凤生[1] 窦洪[1] 钟万里[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：《广东电力》2011年第12期105-108,共4页Guangdong Electric Power

基　　金：广东省工业攻关项目(2010B010900034)

摘　　要：通过宏观检查、金相分析、显微硬度测试以及金属当量温度计算,对某超超临界机组锅炉水冷壁管泄漏原因进行分析。分析结果表明,此次泄漏是由于水冷壁局部超温造成的。检查发现,蠕变裂纹在爆口尖端附近较多,而远离尖端处、爆口背火侧以及距离爆口一定距离的向火侧均未有裂纹;同时,胀粗沿水冷壁管向火侧进行,这是由于向火侧超温严重,且沿向火侧可以发生自由膨胀。By macroscopical examination,metallurgical analysis,test of micro-penetration hardness and equivalent temperature calculation,the paper analyzes causes for leakage of waterwall tube of ultra supercritical unit boiler.The analysis result shows that the leakage results from partial overheat of waterwall tube.It is found through examination that there are many creeping crack at the burst area while there is no crack at place far from sharp points,back side and fire-facing side afar from burst.Meanwhile,the swelling travels to fire-facing side along waterwall tube,which dues to overheat of fire-facing side and free expansion is by any possibility along fire-facing side.

关 键 词：超超临界锅炉 水冷壁管 泄漏分析 局部超温 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]