Leitschaufelsegment, Dampfturbine mit einer Leitschaufelreihe aus mehreren Düsensegmenten und Verfahren zu deren Zusammenbau

Details

Veröffentlichungs-Nr.

EP3967846

Aktenzeichen

EP20195499

Anmeldetag

10. September 2020

Veröffentlichung

3. April 2024

Erteilung

3. April 2024

Rechtsraum

EP

IPC

F01D5/28F01D25/24F01D9/04

Abstract

The invention refers to an integral or monolithic nozzle segment (30) having airfoils (33). According to an aspect of the invention a steam turbine has a casing (17) supporting multiple nozzle segments (30) forming a diaphragm (22) with the airfoils (33) located in a channel (23) through which working fluid flows. The diaphragm (22) surrounds a rotary axis (A) of a steam turbine (15) coaxially and consists of a plurality of individual nozzle segments (30). The nozzle segments (30) and the casing (17) of the steam turbine (15) have substantially equal thermal expansion coefficients. The casing (17) and the nozzle segments (30) are made of different materials and particularly different martensitic steel types. According to yet another aspect of the invention each nozzle segment (30) has a core (37) comprising martensitic steel having a minimum creep strength that fulfills the following conditions at a temperature of 580°C: at least 10⁵ hours under a tensile stress of at least 100 MPa or at least 125 MPa or at least 150 MPa.

Anmelder

Firmen

General Electric Technology GmbH
General Electric Company

Land

🇨🇭 Schweiz

Fachgebiete