Selecting optimal conditions for the turbine warm and hot start-up

The paper discusses optimization issues related to start-ups from intermediate states defined as hot and warm, i.e. carried out after a few or several hours of downtime. Such are characterized by non-uniform field the initial temperature. For this reason, any simulation start-up processes should be preceded simulations cooling process obtain close-to-real temperature distribution at moment when is begin. This particular importance in case elements contact with outer environment, such casings rotors. results indicate that it possible speed up procedure recommended turbine manufacturer without exceeding allowable stresses elements. Naturally, will have beneficial impact on flexibility power unit operation. Rotors most difficult operating conditions for them directly optimized. maximum rate determined element material. presents concept heating key Running during boiler might substantially shorten total time needed restore Instead sequential heating, could parallel.