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Crack Growth Life Monitoring Method for Low Cycle Fatigue and High Cycle Fatigue of Steam Turbine Rotors

A crack propagation life, steam turbine rotor technology, applied in mechanical equipment, engine components, machines/engines, etc.

Active Publication Date: 2016-06-01
SHANGHAI POWER EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the design stage and service stage of the steam turbine, there is no suitable method for monitoring the crack growth life of the steam turbine rotor under the interaction of low cycle fatigue and high cycle fatigue.

Method used

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  • Crack Growth Life Monitoring Method for Low Cycle Fatigue and High Cycle Fatigue of Steam Turbine Rotors
  • Crack Growth Life Monitoring Method for Low Cycle Fatigue and High Cycle Fatigue of Steam Turbine Rotors
  • Crack Growth Life Monitoring Method for Low Cycle Fatigue and High Cycle Fatigue of Steam Turbine Rotors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] For a certain type of half-speed 1000MW nuclear power steam turbine, the structure of the low-pressure rotor adopts a welded rotor, such as Figure 4 shown. In the design phase of this nuclear power steam turbine, the application figure 1 the system shown, figure 2 The method shown and image 3 The computer software shown is used to carry out the design monitoring of the low-cycle fatigue and high-cycle fatigue crack growth life of the steam turbine low-pressure welded rotor. The power plant owner requires the criterion value τ of the calendar life of the nuclear steam turbine rotor crack propagation 0 = 60 years, the annual average shutdown times, annual average 110% overspeed test times, annual average 120% overspeed operation times and annual average high cycle fatigue times of the nuclear power steam turbine are listed in Table 1. The material of the low-pressure welded rotor of the steam turbine is CrNiMoV steel, and the fillet radius of part A of the original...

Embodiment 2

[0199] For a certain type of half-speed 1000MW nuclear power steam turbine, the structure of the low-pressure rotor adopts a welded rotor, such as Figure 4 shown. In the use phase of the nuclear power steam turbine, the application figure 1 the system shown, figure 2 The method shown and image 3 The computer software shown is used to carry out the operation monitoring of the low-cycle fatigue and high-cycle fatigue crack growth life of the steam turbine low-pressure welded rotor. When the operating calendar life of a nuclear power steam turbine is 2 years, the optimized operation monitoring of the low pressure welded rotor of the nuclear power steam turbine is carried out. Criterion value τ for crack propagation calendar life of nuclear steam turbine rotor 0 = 60 years, the annual average shutdown times, annual average 110% overspeed test times, annual average 120% overspeed operation times and high cycle fatigue times of the original and optimized operation schemes of ...

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Abstract

The invention provides a monitoring method of the crack propagation life of low-cycle fatigue and high-cycle fatigue of a steam turbine rotor. The monitoring method is characterized by comprising the specific steps of inputting a material mark of the steam turbine rotor; calculating the maximum stress, the stress range, the critical crack size and the crack size limit value of the crack propagation of the high-cycle fatigue of the steam turbine rotor and the crack propagation life of the high-cycle fatigue of the steam turbine rotor; calculating the maximum stress, the stress range and the critical crack size of the crack propagation of the low-cycle fatigue of the steam turbine rotor, the crack propagation life of the low-cycle fatigue, the first stage of fatigue crack propagation calendar life of the steam turbine rotor and the second stage of fatigue crack propagation calendar life of the steam turbine rotor; determining a criterion value tau 0 of the crack propagation calendar life of the steam turbine rotor; performing the design monitoring on the crack propagation life of the low-cycle fatigue and the high-cycle fatigue. According to the monitoring method of the crack propagation life of the low-cycle fatigue and the high-cycle fatigue of the steam turbine rotor, the quantitative evaluation, the design monitoring and the operation monitoring on the crack propagation life of the low-cycle fatigue and the high-cycle fatigue of the steam turbine rotor are implemented.

Description

technical field [0001] The invention relates to a monitoring method for the extended life of low-cycle fatigue and high-cycle fatigue cracks of a steam turbine rotor, belonging to the technical field of steam turbines. Background technique [0002] During the transient condition of steam turbine shutdown or overspeed test, due to the joint action of the stress caused by centrifugal load and the stress caused by thermal load, the low-cycle fatigue propagation of cracks (or defects) on the outer surface of the steam turbine rotor is caused. During the stable operation of the steam turbine under load, due to the joint action of the stress caused by the gravity load of the blade and rotor, the stress caused by the centrifugal force load and the thermal load, it may lead to the high cycle fatigue propagation of the crack (or defect) on the outer surface of the steam turbine rotor. The applicant has applied for an invention patent "Monitoring Device and Method for Internal Cracks ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D21/00
Inventor 史进渊汪勇杨宇邓志成叶文王琳蒋俊
Owner SHANGHAI POWER EQUIP RES INST