Steam Turbine Rotor Crack Analysis And Processing Of 150 Plant 50MW Unit

Because of the reform and the present status of China's energy policy, many units of extended active duty are still on their service-line. Safety of these units can not be ignored. The safety performance and safety margin of turbine directly influence the life of the whole unit. So the research of turbine rotor crack is an important mean for life. In this paper, through studying the causes and the process of turbine rotor crack, we can identify a low-cycle fatigue cycles stress amplitude and calculate turbine rotor fracturing cycle and the residual life; through studying turbine temperature and mechanical stress field,. we can get the loss of unit life under various conditions and reasonably arrangement unit start-stop program; through studying comparative treatment program of cracked rotor, we can get the program of the greatest strength and the smallest stress of the rotor surface after turning .Furthermore, we can get a clear basis for rotor cracks treatment.