Solid particle erosion resistant steam turbine nozzle

The present invention is steam turbine nozzle resisting solid grain corrosion, relates to the improvement of nozzle structure for steam turbine, and aims at solving the problem of solid grain corrosion of steam turbine nozzle. The present invention has regulating stage blades fixed between inner nozzle ring and outer nozzle ring, nozzle passages formed with inner nozzle ring, outer nozzle ring and two adjacent regulating stage blades, and solid grain impact angle to the pressure surface of the regulating stage blades of 9-11 deg. The present invention has the solid grain impact angle to the pressure surface of the regulating stage blades greatly decreased from available technology, so as to avoid the high erosion area of the blade material and decrease the number of solid grains nozzle exit surface obviously. The present invention has less stage efficiency degradation each month and longer nozzle service life compared with available technology.