Steam Turbine Components and Systems （汽轮机组件和系统）.pdfVIP

THERMAL POWER PLANTS – Vol. III - Steam Turbine Components and Systems - R.A. Chaplin STEAM TURBINE COMPONENTS AND SYSTEMS R.A. Chaplin Department of Chemical Engineering, University of New Brunswick, Canada Keywords: Steam Turbines, Cylinders, Rotors, Blades, Seals, Bearings, Lubrication Contents 1. Turbine Cylinder Configuration 1.1. Introduction 1.2. Turbine Cylinders 1.3. Turbine Rotors 1.4. Turbine Blading 2. Turbine Seals S S 2.1. General Principles 2.2. Gland Sealing S R 2.3. Gland Steam System L 3. Turbine Bearings E 3.1. General Requirements O T 3.2. Bearing Lubrication 3.3. Fire Resisting Fluid E P Acknowledgements A Glossary – Bibliography H Biographical Sketch O C Summary C E Steam turbines consist essentially of a casing to which stationary blades are fixed on the S inside and a rotor carrying moving blades on the periphery. The rotor is fitted inside the E L casing with the rows of moving blades penetrating between the rows of fixed blades. P Thus steam flowing through the turbine passes alternately through fixed and moving N blades with the fixed blades directing the steam at the right angle for entry into the M moving blades. Both casings and rotors must be constructed to minimize damaging U thermal stresses and the moving blades must be fitted to the rotor securely to withstand A the high centrifugal forces. S Where the shaft of the rotor passes through the ends of the casing, a seal is required to prevent steam leakage. Also within the casing, seals are