1000MW核电汽轮机高压缸启动过程热应力及汽密性分析  

Numerical Analysis of Thermal Stress and Steam Tightness for the High-pressure Cylinder of a 1 000 MW Nuclear Steam Turbine in the Startup Phase

作　　者：魏红明[1] 蔡林[1] 侯修群 谢诞梅[1] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072

出　　处：《热能动力工程》2016年第10期32-37,124,共6页Journal of Engineering for Thermal Energy and Power

摘　　要：汽轮机高压缸是高温高压蒸汽的通流部件,其内壁面直接和蒸汽接触。在机组启停及变负荷时,蒸汽参数的剧烈变化容易造成高压缸热应力过大甚至变形等现象。以某型1 000 MW核电半速汽轮机高压缸为例,对其启动过程高压缸的温度及应力分布进行有限元计算,进而分析汽缸中分面的汽密性。计算结果表明:在所设置的启动曲线下,启动过程中,高压缸轴封处温差及应力均较大,且中分面接触压力较小;高压缸最大热应力(217 MPa)出现在机组刚进入额定负荷时刻。Steam turbine high-pressure casing is the steam passage component with high temperature and pressure,where its inner wall surface contacts with steam directly. When the unit commitment and load change,the drastic change of steam parameters is likely to cause deformation of cylinder body. The operating data of nuclear power plant show that the high-pressure cylinder of nuclear power steam turbine is prone to excessive stress,deformation and steam leakage phenomenon. In this paper,the finite element method was used to calculate the startup process of 1000 MW nuclear power half-speed turbine high-pressure cylinder,and the temperature and stress situation of high pressure cylinder during the boot process were analyzed,followed by the study of the vapor tightness of cylinder split. The results show that during the boot process,the maximum thermal stress of high-pressure cylinder occurs in the moment the unit just reaches the rated load( 217 MPa). And the temperature difference and stress of the shaft seal of high-pressure cylinder is relatively large,while the contact pressure of split is fairly small.

关 键 词：核电汽轮机 汽缸变形 热应力 汽密性 

分 类 号：TK263.1[动力工程及工程热物理—动力机械及工程]