大型汽轮机部件蠕变寿命的设计和评估  

CREEP LIFE DESIGN AND EVALUATION OF LARGE STEAM TURBINE PARTS

作　　者：史进渊[1] 孙庆[1] 杨宇[1] 胡先约[1] 

机构地区：[1]上海发电设备成套设计研究所,上海200240

出　　处：《中国电机工程学报》2002年第3期103-107,共5页Proceedings of the CSEE

摘　　要：文中提出了汽轮机部件蠕变寿命的计算方法。介绍了汽轮机转子、主蒸汽管道、汽缸和阀壳稳态蠕变应力和非稳态蠕变应力的计算方法 ,采用大型有限元分析计算程序计算汽轮机部件的非稳态蠕变应力和稳态蠕变应力。文中并介绍了使用变厚度叶轮模型计算转子和叶轮稳态蠕变应力的计算公式 ,以及使用厚壁圆筒模型计算管道和壳体稳态蠕变应力的计算公式。使用拉森———米勒方法确定汽轮机部件材料的断裂特性 ,考虑安全系数后可确定汽轮机部件的蠕变预计寿命。最后给出了汽轮机部件蠕变寿命的定量计算方法和应用实例。该计算方法为汽轮机部件蠕变寿命的设计、评估和诊断提供了科学的依据。This paper presents a method for creep life calculation of steam turbine parts.The method takes into consideration both for steady and unsteady creep stresses of rotors,pipes,casings and valve housings to be determined with the help of finite element analysis programs.Calculation formulas for steady creep stresses of rotors and discs for models with stepwise changes of thickness and those of pipes and casings modeled as thick wall cylinders are described.The creep rupture characteristics of the materials are determined by the Larson-Miller method and the creep life expectancy of the steam turbine parts are calculated with of a safety factor.Quantitative calculation are presented together with practical examples.The suggested method may provide a scientific basis for creep life design,creep life evaluation and creep life diagnosis of steam turbine parts.

关 键 词：大型汽轮机 部件 蠕变寿命 设计 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]