Simulation Soft System on the Fatigue Life Loss of Startup and Shutdown for a 600MW Steam Turbo Unit

The simulation system on the thermal stress & fatigue life loss of the rotor during startup & shutdown for a domestic 600 MW steam turbo generator unit, by the simulation, the surface of the shaft was suffered a crushing stress, but it was a pulling stress when a unit shutdown. The max thermal stress & the max combined stress produced on the rotor of a medium pressure cylinder was about 17.6% bigger than those on the rotor of the high pressure cylinder when they had the same increase rate of temperature. When thought from economics & safety, the optimal temperature-increase-rate of the rotor was 2.05°C/min when the unit startup at hot state, and shut down the unit, it´s optimal for slipping-parameter and the optimal temperature-decease-rate of the rotor was 0.78°C/min.