Analysis on corrugated pipe break in the expansion joint of a turbo-generator set

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Li, Wanjun^1 ; Yuan, Chen^2 ; Li, Chong^2

Huadian Electric Power Research Institute Co. LTD., Jinan

250014, China^1

Huadian Power International Corporation LTD., Shiliquan Power Plant, Zaozhuang

277103, China^2

关键词: break;    Corrugated pipes;    Energy spectrum analysis;    Macroscopic morphology;    Metallographic examination;    Micro characteristics;    Steam turbine-generator set;    Turbo-generator unit;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/4/042017/pdf
DOI  :  10.1088/1755-1315/300/4/042017

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In a power plant, the bellows of the lower part of the expansion joint for pumping and heating of the NO.8 turbo-generator unit breaked, and the internal guide plate was teared along the welding seam. Through observation of macroscopic morphology, hardness analysis, metallographic examination, energy spectrum analysis and other means, the corrugated pipe material itself unqualified performance, stress corrosion cracking, corrosion and other reasons were eliminated. According to the micro-characteristics of fatigue fracture and the service environment of the bellows, it is concluded that the main reason of break is the fatigue cracking of the bellows under the impact of the air flow and vibration.