Retrofitting methods and devices for large steam turbines

摘要

A method of replacing rotating metal blades of a steam turbine inserted into a rotor having one or more existing grooves for inserting root sections of the metal blades is described, the method including the steps of providing replacement blades having radially inwards directed root sections of fiber-reinforced composite material, changing the shape of the one or more grooves in the rotor to form a cavity for the insertion of the root sections of fiber-reinforced composite material and inserting the replacement blades into the rotor.

主权项

1. A method of replacing rotating metal blades of a steam turbine inserted into a rotor having at least one existing groove configured to receive root sections of the metal blades, the method comprising:
providing replacement blades having radially inwards directed root sections of fiber-reinforced composite material; changing a shape of the at least one groove in the rotor to provide a cavity for the insertion of the root sections of fiber-reinforced composite material; inserting the replacement blades into the rotor; and wherein the at least one existing groove has several teeth or hooks and the shape of the at least one existing groove is changed by machining an altered groove profile into the rotor such that at least top and bottom teeth remain without significant alterations.