风电介入对汽轮机转子寿命影响分析

Study on the Influence of the Intervention of Wind Power on Steam Turbine Rotor Life

为了实现风火联合安全运行,采用有限元法对风电介入前后火电机组负荷变化、汽轮机转子温度场、应力场进行对比分析,确定转子的危险位置,绘制Von Mises应力时间历程曲线,再根据雨流计数法和线性疲劳累积损伤理论,计算出负荷变化过程中转子总的疲劳寿命损耗。结果表明,无论风电是否介入,转子Von Mises应力最大值、温度场剧烈变化的位置均出现在中压第一级叶轮根部,而风电的介入导致该处Von Mises应力时间历程曲线的应力循环数量增加,使得转子寿命损耗系数由0.000 653 9%增加到0.001 408%,转子寿命损耗速度增加为原来的2.15倍,可见风电的介入对转子的使用寿命产生了重大影响。

In order to achieve the safe operation of wind and thermal power,this paper adopts the finite element method to analyze the load change of the thermal power unit,the temperature field and the stress field of the steam turbine rotor before and after wind power intervention.The dangerous position of the rotor is determined as well.Then the Mises Von stress curve of the rotor is plotted,and the total life loss of the steam turbine rotor is calculated based on the rain-flow counting method and the linear fatigue cumulative damage theoryThe results show that whether the wind power is involved or not,the maximum value of Mises Von stress is always at the root of IP first stage impeller,and the temperature field also has severe change at the same location as well.When wind power is involved,the numbers of the stress cycle will increase so that,the life loss of the steam turbine rotor increasing from 0.000 653 9%to 0.001 408%and the life loss speed increasing 2.15 times as the original one.,The study shows that wind power has significant influence on the rotor life.