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火电厂四大管道主阀门缺陷形成及损伤行为分析
Analyses on Defect Formation and Damage Behaviors of Main Valves Employed in HTHP Pipes of Thermal Power Plant
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- DOI:
- 作者:
- 许辉 郭延军 郦晓慧 王鲁 乔立捷 杨林 邱质彬
XU Hui;GUO Yanjun;LI Xiaohui;WANG Lu;QIAO Lijie;YANG Lin;QIU Zhibin
- 作者单位:
- 华电电力科学研究院有限公司材料技术部
Department of Materials Technology,Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,China
- 关键词:
- 四大管道 主阀门 裂纹 缺陷 应力集中
HTHP pipe main valve crack defect stress concentration
- 摘要:
- 四大管道主阀门的服役性能影响着火电机组的正常运行,服役过程中主阀门形成的各种不同缺陷会给机组运行带来安全隐患。本文结合火电厂四种主阀门的工作原理、服役特点,综述了服役前后这些阀门的主要缺陷类型、形成机理以及损伤机制;总结了主阀门各种原始缺陷、局部应力集中,组织性能退化等对阀门服役性能的影响,并对阀门中各种常见的应力腐蚀和疲劳失效问题进行分析,阐述了相应的治理措施。
The service performance of the main valves of the HTHP major pipelines affects the normal operation of the ignition unit of thermal power plant.Various defects of the main valve in service may bring safety risks to the thermal power unit operation.Based on the working principle and service characteristics of four main valves in thermal power plant,the main defect types,formation mechanism and damage mechanism of these valves before and after service were summarized.The effects of various original defects,local stress concentration and microstructure degradation on service performance of main valve were summarized.The common stress corrosion and fatigue failure problems in valves were analyzed and the corresponding control measures were expounded.