联合循环机组汽轮机高中压外缸的热应力分析  

Numerical Investigation on Thermal Stress of Steam Turbine HIP-casing for Combined Cycle Unit

作　　者：蒋能东[1] 马少林[1] 李军[2] 

机构地区：[1]东方汽轮机有限公司,四川德阳618000 [2]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《东方汽轮机》2014年第2期18-22,共5页Dongfang Turbine

摘　　要：文章采用商用有限元结构分析软件ANSYS对一典型联合循环机组的高中压外缸的热应力进行三维数值分析研究。根据给定的温度边界条件,对汽缸在无、有隔热罩两种结构下进行热应力和相应的热变形计算。计算结果表明在无隔热罩的情况下,汽缸的应力已超出了材料的允许强度。汽缸的再热蒸汽温度提高后采用隔热罩以及蒸汽冷却,有效地降低了汽缸内壁的温度,确保了汽轮机运行的安全。In this paper, commercial finite element structure analysis software ANSYS is adopted to make a 3D numerical investi- gation on the thermal stress of HIP outer casing of a typical combined cycle unit. Basing on the given temperature boundary condi- tion, thermal stress calculation and corresponding thermal deformation calculation are conducted on both casing with thermal shield and without thermal shield. The calculation result suggests that the thermal stress of the casing will go beyond the allowed intensity of casing materials without the thermal shield. In other words, after the reheat steam temperature goes up, the inner wall temperature of the casing will drop effectively because of the adoption of the thermal shield and steam cooling, so that the safe operation of the casing is secured.

关 键 词：有限元法 汽轮机 高中压缸 温度场 热应力 弹性接触 数值分析 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]