1、 1000MW汽轮机滑参数停机优化研究之汽轮机转 子温度场及应力场的有限元计算 1000MW sliding-parameter shutdown of optimization of steam turbine rotor of steam turbine on the study of finite element calculation of temperature field and stress field 1000MW 汽轮机滑参数停机优化研究 I 中文摘要 汽轮机在启停、变负荷运行时,由于转子表面蒸汽参数的不断变化,其内部处于非稳 态温度场,将产生较大的温度梯度及热应力,汽轮机转
2、子是汽轮机的最重要部件,汽轮机 转子的热应力是限制机组启停速度及安全运行的关键因素。因此为了保证机组运行的安全 性与经济性,对汽轮机转子进行温度场与应力场的计算分析,实现单元机组启动、停运优 化,是电力系统关注的热点问题之一。 依据轴对称弹性理论,运用工具软件Ansys对1000MW汽轮机转子进行建模,该模型在 空间域应用有限元网格划分,在时间域用有限差分网格划分,对转子上应力集中的部位进 行网格加密,依据转子的温度场与应力场的数学模型。本文用有限元法对1000MW机组滑 参数停机过程中汽轮机高压、中压转子建立二维模型进行温度场、应力场的分析计算,得 到机组滑参数停机运行下的转子主要部位的温度
3、场与应力场,以此得到不同时刻的温度场 与应力场分布及热应力集中部位应力值随时间变化的情况,找出高压转子温度场、应力场 的变化规律,使该汽轮机转子表面最大合成实际应力控制在280MPa以下,对计算结果进行 综合分析,对1000MW汽轮机滑参数停机提出合理化建议。 关键词:汽轮机,转子,温度场,应力场,有限元计算, 沈阳工程学院毕业设计(论文) II Abstract Steam turbine in start-stop, variable load operation, because the rotor surface steam parameters, the internal chang
4、es in the steady-state temperature field, will produce the large temperature gradient and thermal stress,steam turbine rotor is the most important components, steam turbine rotor thermal stress is restricted unit start-stop speed and safe operation of the key factors. So in order to ensure the secur
5、ity of the unit operation, and economy of steam turbine rotor of temperature field and stress field of calculation and analysis, realize optimized unit aircrew start, etc, is the electric power system is one of the hot issues. According to axisymmetric elasticity theory, using tools software Ansys m
6、odeling 1000MW steam turbine rotor in spatial domain, this model finite element mesh division, in the time domain meshing with finite difference of rotor position of stress concentration grid encryption, upon the rotor temperature field and stress field of the mathematical model. In this paper, using the finite element method to stop 1000MW units slippery parameters during high voltage and medium-pressure steam turbine rotor establish two-dimensional model of the temperature field and stress fi