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Method and system for assessing life of cracked dovetail in turbine

A steam turbine, wedge-shaped technology, applied in the field of steam turbines, can solve problems such as flying out of blades, damage to the casing and support of the steam turbine, and injury to the operator of the steam turbine

Inactive Publication Date: 2007-06-13
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the mass and rotational speed of the steam turbine, such as typically required at 3600 revolutions per minute (rpm), should a crack in the impeller wedge develop enough that one or more blades fly out of the rotor wheel, damage to the turbine, its casing and supports may occur. Causes significant injury, also to the operator of the steam turbine
In most cases, all hooks will be damaged and the blades will fly out of the rotor

Method used

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  • Method and system for assessing life of cracked dovetail in turbine
  • Method and system for assessing life of cracked dovetail in turbine
  • Method and system for assessing life of cracked dovetail in turbine

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Embodiment Construction

[0019] FIG. 2 is a cross-sectional view of a tangential wedge connection 16 of a steam turbine wheel 12 . A wedge connection is located on the outer annular flange of the impeller. The connector is generally in the shape of an inverted "V" with a plurality of protrusions 18 extending outwardly from the sides of the connector. These protrusions 18 are commonly referred to as "hooks" of the connector. Each hook provides a connection to a mating wedge 14 at the bottom of the turbine blade 10 .

[0020] The hooks 18 of the wedge connector are generally loaded along their lower surface 20 . Loading occurs when the mating hooks of the turbine blade wedge abut against the lower surface 20 of the impeller 12 wedge. During the rotation of the impeller, centrifugal force acts in the radial direction. The centrifugal force exerts a radial force (F) on the lower surface 20 of the impeller wedge connection 16 . These forces are proportional to the rotational speed of the impeller. Wh...

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PUM

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Abstract

A method has been developed for predicting a remaining operational life of a turbine component including: obtaining crack flaw data regarding current crack flaws in the turbine component; using the crack flaw data with data regarding the structure and operating conditions of the turbine component to determine force loads applied to the turbine component and generate crack propagation data; applying a probalistic analysis to the crack flaw data and the generated crack propagation data to generate a statistical distribution of crack data, and applying the statistical distribution of crack data to predict a time to failure of the component by iteratively determining the force loads for successive periods of time.

Description

technical field [0001] The present invention relates generally to steam turbines, and more particularly to methods of assessing cracking of turbine rotors and other metallic turbine components in steam turbines that come into contact with water, steam, and condensate. Background technique [0002] The steam turbine power system uses a fluid working fluid such as water or other suitable chemical fluid with a boiling point and latent heat value suitable for the operating temperature of the system. The fluid working fluid is usually heated by a separate heat source, such as a boiler using directed solar radiation, fossil fuel combustion, nuclear radiation or geothermal energy. Energy is transferred from the heat source to the steam turbine in the form of high-pressure steam to power the steam turbine. The steam turns the rotor in the steam turbine. The rotation of the steam turbine can be used to drive an electromagnetic generator to generate electricity. [0003] A common t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/00G01M19/00G01N29/04G01M99/00
CPCG01N2203/0073G01N29/4418F01D21/003G01N2291/02827G01N2291/0235F05D2260/80G01N2203/0062G01N29/041G01N2203/0075G01N29/045G01N2291/0422G01N2291/0258G01N2291/2693
Inventor Y·卡迪奥格卢A·K·古普塔R·P·奈尔E·J·埃克兰德E·V·埃梅特里奥
Owner GENERAL ELECTRIC CO