超超临界汽缸高温强度及多轴蠕变分析  

High Temperature Strength and Multi-Axial Creep Analysis on Ultra-Supercritical IP Inner-Casing

作　　者：毛剑峰[1] 王炜哲[1] 张军辉 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240 [2]上海电气电站集团汽轮机厂设计处,上海200240

出　　处：《力学季刊》2013年第3期437-443,共7页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(50906049)

摘　　要：超超临界汽轮机汽缸的多轴蠕变分析与高温强度设计对机组安全高效运行至关重要。对于在超超临界参数下中压内缸,它的主要破坏来自于高温和复杂应力共同作用下的蠕变损伤。随着蒸汽参数(温度T,压力P)的不断提升,原汽缸承受的蠕变损伤越发严重,因此有必要进行局部结构改进。应用基于受约束孔洞长大机制的Cocks-Ashby多轴蠕变模型对新老汽缸进行了对比分析,并采用了有限元计算方法得到了汽缸多轴蠕变等效应变的分布。结果表明:基于孔洞长大蠕变理论能较好地预测汽缸危险点的多轴蠕变;新汽缸比老汽缸在抗蠕变性能方面有一定改善。The multi-axial creep analysis and high temperature strength design are crucial for the safety and efficiency on the ultra-supercritical intermediary pressure （IP） inner-casing. The creep damage of the IP inner-casing results from the coupling effect of high temperature and complex stress states. With the ever-increasing steam parameters（temperature T, pressure P）, the original innercasing suffers more and more creep damage, so the structure of which needs modification. Subsequently, the comparison of the multiaxial creep strength was performed between the original and newly-designed one by using Cavity Growth Theory（CGT）. The distribution of multiaxial equivalent creep strain was obtained on the innercasing by finite element method（FEM）. Finally, the results suggest that CGT can predict the dangerous points of the innercasing, and the newly-designed casing has some impovements on anti-creep perform- ance.

关 键 词：中压内缸 多轴蠕变 高温强度 汽缸设计 

分 类 号：TU311[建筑科学—结构工程] P315.9[天文地球—地震学]