Change of steam distribution modes and experimental research of steam turbine in power plant

The steam bending stress of the curtis stage in turbine under low load conditions is an important factor of blade vibration.Investigate the influences of the steam bending stress and analysis effect of different steam distribution modes to the steam force.In order to decrease steam force of the rotor blades,measures of changing the steam distribution mode of steam turbine in power plant were proposed.In the case of keeping the fourth and fifth control valves,the first three control valves were designed newly,and the flux characteristic of steam control valves was obtained.To verify the effect of the change of steam distribution mode,the experimental research of steam turbine under different loads were carried on.The results showed that the experimental and calculated parameters such as flux characteristic,nozzle pressure agree well,which indicated the method of calculation is reasonable and accurate.Through the experiment of speed control system of turbine,the performance difference before and after change showed that change of steam distribution mode will not bring significant impact to speed control system,which can meet the design requirement.