600MW超临界汽轮机受损转子热力耦合有限元分析  

Coupled Thermo-Mechanical Finite Element Analysis of Damaged Rotor in 600 MW Supercritical Steam Turbine

作　　者：唐远富[1] 陈红冬[1] 彭碧草[1] 刘纯[1] 龙毅[1] 

机构地区：[1]国网湖南省电力公司电力科学研究院,长沙市410007

出　　处：《电力建设》2014年第4期107-110,共4页Electric Power Construction

摘　　要：600 MW超临界机组汽轮机高、中压转子蒸汽参数高,转速高,工作环境恶劣,在运行过程中产生很大的应力变化,某600 MW超临界机组由于某些原因导致转子断油烧瓦,严重影响到机组的安全运行。为了掌握转子的应力状态,保障转子安全运行,采用有限元软件ANSYS APDL对转子在冷态启动工况下进行有限元计算。基于工程热力学计算,求解转子各级的对流放热系数,将其作为边界条件加载到有限元模型上,进行温度场的计算和分析,然后通过采用热结构间接耦合法对转子的应力场进行计算分析,得到转子冷态启动过程的应力分布和应力集中的部位。计算结果表明,受损转子切削处理后等效应力小于屈服应力,但在调节级根部凹槽、挡油环与轴颈附近应力水平较大,此结论可为受损转子的安全性评估及寿命管理提供技术支撑。Due to high steam parameters, high speed, poor working conditions of high and intermediate pressure rotors in 600 MW supercritical steam turbine, it will cause great stress change in the operation process. Rotor burnout occurred due to oil breakoff in a 600 MW supercritical unit, which seriously affected the safe operation of the unit. In order to grasp the stress state of the rotor, and ensure its safety operation, a finite element analysis mode was established by software ANSYS APDL for rotors under cold starting condition. Based on the engineering thermodynamics calculation, the convection coefficients of rotors were calculated, which was used as boundary conditions of the finite element model for the calculation and analysis of temperature field. Then the analytical method of indirect therrno-structure coupling was adopted to calculate and analyze the stress field of rotor, in which the stress distribution and the stress concentration position during the cold starting process of rotor could be obtained. The results show that the equivalent stress of rotor after cutting processing is less than its yield stress, but the stress is larger at the roots groove of governing stage, oil retainer and journal, which can provide technical support for the safety assessment and life management of damaged rotor.

关 键 词：超临界汽轮机 受损转子 冷态启动 有限元分析 

分 类 号：TM621[电气工程—电力系统及自动化]