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Monitoring method of crack propagation life of low-cycle fatigue and high-cycle fatigue of steam turbine rotor

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

Active Publication Date: 2015-04-01
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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  • Monitoring method of crack propagation life of low-cycle fatigue and high-cycle fatigue of steam turbine rotor
  • Monitoring method of crack propagation life of low-cycle fatigue and high-cycle fatigue of steam turbine rotor
  • Monitoring method of crack propagation life of low-cycle fatigue and high-cycle fatigue of steam turbine rotor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] A certain type of nuclear power steam turbine with a half speed of 1000MW, the low-pressure rotor adopts the structure of the welded rotor, such as Figure 4 shown. In the design stage of the nuclear power steam turbine, the application figure 1 system shown, figure 2 the method shown and image 3 The computer software shown, carries out the design monitoring of the low-cycle fatigue and high-cycle fatigue crack growth life of the low-pressure welded rotor of this steam turbine. Criterion value τ for the calendar life of crack propagation of the nuclear steam turbine rotor required by the power station owner 0 = 60 years, the annual average number of shutdowns, the average annual number of 110% overspeed tests, the average annual number of 120% overspeed operations and the average annual high cycle fatigue times of the nuclear power turbine are listed in Table 1. The low-pressure welded rotor material of the steam turbine is made of CrNiMoV steel, and the fillet ra...

Embodiment 2

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

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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 low-cycle fatigue and high-cycle fatigue crack propagation life of a steam turbine rotor, and belongs to the technical field of steam turbines. Background technique [0002] During the transient conditions of the stoppage or overspeed test of the steam turbine, the combined action of the stress caused by the centrifugal force load and the stress caused by the thermal load leads to the low-cycle fatigue propagation of the cracks (or defects) on the outer surface of the steam turbine rotor. During the stable operation of the steam turbine under load, due to the combined action of the stress caused by the gravitational load of the blade and the rotor, the stress caused by the centrifugal force load and the thermal load, it may lead to the high-cycle fatigue propagation of the cracks (or defects) on the outer surface of the steam turbine rotor. The applicant has applied for the invention patent "Monitori...

Claims

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Application Information

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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