Abstract:The more serious solid particle erosion (SPE) of the super-critical pressure steam turbine has become a main obstacle to limit its operational flexibility. As the mode of the turbine peak-load-dispatch operating deeply and frequently, the optimized valve control scheme is a valid way to reduce the harm of solid particle erosion for turbine. This paper is taking a 660MW super-critical steam turbine as the research object, aiming to get the SPE model to the blades of the turbine’s governing stage, as its load varying respectively corresponded to sliding pressure and constant pressure running modes, the solid particle erosion condition of steam turbine governing stage move leaves are simulated. Through numerical simulation, the main location of the solid particle erosion of the governing stage is determined in the super-critical steam turbine, and the law of the change of the solid particle erosion density of the governing stage with load is obtained when the unit is running at constant pressure and sliding pressure respectively. Based on the analysis of the simulation results, a series of valve control scheme to reduce the SPE of governing stage of the turbine are presented.