压水堆核电厂汽轮机启动过程的转子热固耦合分析

Rotor Thermostructure Coupling Analysis of Steam Turbine Start-upProcess in PWR Nuclear Power Plant

以压水堆核电厂1100 MW汽轮机组为研究对象,建立了高中压转子二维模型,运用有限元方法研究机组冷态启动过程高中压转子温度场和应力场分布情况。分析结果表明,启动过程中高中压转子的温度由表面向中心传递。由于受到前期冲转的影响,冷态启动至833.5 min时在中压转子腔室内壁得到启动过程热应力最大值为199.25 MPa。这是由于中压转腔室内壁与转子表面的变形量之差相比于高压转子表面与对应中心的变形量之差更大,使得腔室内壁出现最大应力。

Taking a 1100 MW steam turbine unit of a pressurized water reactor(PWR)as the research object,a two-dimensional model of the high pressure rotor was established,and the distribution of temperature field and stress field of the high pressure rotor during cold start-up was studied by finite element method.The results show that the temperature of the high and medium pressure rotor is transferred from the surface to the center during start-up.Due to the influence of the early shock,the maximum thermal stress in the middle pressure rotor chamber is 199.25 MPa when the cold start is 833.5 min.This is because the difference between the deformation of the inner wall and the rotor surface is larger than that between the surface and the corresponding center of the high pressure rotor,resulting in the maximum stress on the inner wall of the cavity.