超超临界锅炉化学取样管管座失效分析及改进

Failure Analysis and Improvement of a Chemical Sampling Pipe Socket in an Ultra-supercritical Boiler

为解决某超超临界锅炉化学取样管管座失效导致蒸汽泄漏的问题,采用数值模拟的方法对管座受力进行分析,结合硬度及材质检测、断面分析研究管座失效原因,并对管座结构进行改进。结果表明:管座失效原因是焊缝根部未焊透及存在应力叠加,改进后管座失效问题得到解决。

To solve the problem of steam leakage resulting from the failure existing in a chemical sampling pipe socket for an ultra-supercritical boiler,force analysis was conducted on the pipe socket by numerical simulation to find the failure causes through hardness measurement,material test and fracture surface analysis,after which,the structure of the pipe socket was improved.Results show that the failure of the pipe socket is found to be caused by the incomplete penetration and superimposed stress existing in the weld seams,and the problem is finally solved through structure improvement of the socket.