Creep-Fatigue Life Prediction of Stop and Regulating Valves on the Intermediate-Pressure Section of a 1000MW Steam Turbine
Creep-Fatigue Life Prediction of Stop and Regulating Valves on the Intermediate-Pressure Section of a 1000MW Steam Turbine
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DOI：
10.1115/gt2013-94167
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
J. Mao;Junhui Zhang;Wei-zhe Wang;Yingzheng Liu
中科院分区：
文献类型：
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作者：
J. Mao;Junhui Zhang;Wei-zhe Wang;Yingzheng Liu
介绍了1000MW汽轮机中压段停止一体化阀。将基于连续损伤力学（CDM）的多轴模型应用于阀门寿命预测。采用疲劳蠕变有限元法研究了某1000MW超临界汽轮机阀门的瞬态应力场和温度场。由于涡轮机在两次启动之间通常运行120天，因此创建了120天区块的简化任务剖面。因此，120天的塑性和蠕变加载块反复运行，以实现22年的蠕变疲劳寿命预测。蠕变和疲劳的相互作用按适当的顺序考虑到总损伤。由于其高度复杂的应力和结构，从时间和空间角度分别对疲劳和蠕变的多轴因素进行了评估。在此基础上，讨论了集成阀的蠕变疲劳损伤与多轴因素的关系。多轴CDM模型对阀的寿命进行了满意的预测。ASME版权所有©2013
The stop integrated valve on the intermediate-pressure (IP) section of a 1000MW steam turbine is presented in this paper. A multiaxial model based on continuum damage mechanics (CDM) is applied to life prediction of the valve. The transient stress and the temperature fields of the valve in a 1000MW supercritical steam turbine are investigated by using finite element method (FEM) for fatigue-creep. Since the turbine typically runs 120 days between starts, a simplified mission profile for a 120-day block was created. Accordingly, the 120-day loading block with plasticity and creep was run repetitively to achieve a 22 years creep-fatigue life prediction. The interaction between creep and fatigue was considered in total damage in proper order. Due to highly complex stress and structure, the multiaxial factors for fatigue and creep are assessed from the temporal and spatial points of view respectively. Furthermore, the creep-fatigue damage of the integrated valve is discussed in relation to the multiaxial factors. The results drawn from the multiaxial CDM model give a satisfactory life prediction on the valve.Copyright © 2013 by ASME