Comparison of Performances of Full-Speed Turbine and Half-Speed Turbine for Nuclear Power Plants

The steam turbines of nuclear power plants can be divided into the full-speed turbine and half-speed turbine.Different speed leads to differences in many aspects.Therefore,the rational speed is the key point in the selection of steam turbines.This paper contrasts the economy between the half-speed turbine and full-speed turbine,by calculateing the relative internal efficiency of half-speed and full-speed steam turbines with the typical level of 1000 megawatt.At the same time,this paper also calculate the relative speed of high speed water drops in the last stage blade of half-speed turbine and full-speed turbine,to contrast the water erosion between the half-speed turbine and full-speed turbine.The results show that the relative internal efficiency of half-speed turbine is higher than that of the full-speed turbine,and that the security especially the ability of preventing water erosion of half-speed turbine is better than that of the full-speed turbine.