摘要
阀门是保障电站锅炉安全运行的重要部件,其服役过程中的失效会导致重大事故。因此,对失效阀门进行系统性检测与失效分析,这对进一步理解阀门失效机理及延长电站寿命具有重要意义。本文以某电厂电站锅炉检验过程中发现的阀门失效缺陷为例,采用理化检测和仿真模拟等技术手段,对缺陷部位的应力分布、力学性能及组织状态等进行数据采集与分析。试验数据表明:阀体材质的抗拉强度、冲击韧性和硬度等力学性能不符合相关标准要求;断口组织中存在Al或Al;O;夹杂组织。综合阀体仿真模拟的运行结果可得出:流体速度对热疲劳裂纹的产生作用较小,而长期高温状态及交变应力是热疲劳裂纹生成的主要因素。
Valve is an important component to ensure the safe operation of utility boiler.Its failure in service will lead to major accidents.Therefore,the systematic detection and failure analysis of the failed valve is of great significance to further understand the valve failure mechanism and prolong the service life of the power station.Taking the valve failure defect found in the inspection of a power plant boiler as an example,this paper collects and analyzes the stress distribution,mechanical properties and microstructure of the defect by means of physical and chemical detection and simulation.The test data shows that the mechanical properties of the valve body material,such as tensile strength,impact toughness and hardness,does not meet the requirements of relevant standards.There are Al or Al;O;inclusions in the fracture structure.Combined with the operation results of valve body simulation,it can be concluded that fluid velocity has little effect on fatigue crack,and long-term high-temperature state and stress change are the main factors of thermal fatigue crack formation.
作者
李双
孙杰
李绪丰
Li Shuang;Sun Jie;Li Xufeng(Guangdong Institute of Special Equipment Inspection and Research,Foshan 528251)
出处
《设备监理》
2021年第9期69-72,共4页
Plant Engineering Consultants
关键词
阀门
电站锅炉
失效
理化检测
仿真模拟
热疲劳裂纹
Valves
Utility boiler
Invalid
Physical and chemical test
Analogue simulation
Thermal fatigue crack
作者简介
通讯作者:李双(1992-),女,硕士,从事承压类特种设备安全技术研究工作。E-mail:1033066511@qq.com。
