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Method for predicting high cycle fatigue life of steam turbine generator retaining ring and device for monitoring high cycle fatigue life of steam turbine generator retaining ring

A turbo-generator, high-cycle fatigue technology, applied in electrical testing/monitoring, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc.

Active Publication Date: 2014-08-27
SHANGHAI POWER EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing prediction and monitoring methods for the life of turbo-generator retaining rings, the prediction and monitoring methods for the low-cycle fatigue life of turbo-generator retaining rings are given, and the prediction of high-cycle fatigue life of turbo-generator retaining rings in the design stage and the monitoring of the high cycle fatigue life of the turbine generator retaining ring in the manufacturing stage, there is no suitable method and device available for use

Method used

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  • Method for predicting high cycle fatigue life of steam turbine generator retaining ring and device for monitoring high cycle fatigue life of steam turbine generator retaining ring
  • Method for predicting high cycle fatigue life of steam turbine generator retaining ring and device for monitoring high cycle fatigue life of steam turbine generator retaining ring
  • Method for predicting high cycle fatigue life of steam turbine generator retaining ring and device for monitoring high cycle fatigue life of steam turbine generator retaining ring

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Experimental program
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Effect test

Embodiment 1

[0066] For a certain type of 300MW thermal power turbine generator, the working speed is 3000 rpm, the structure of the retaining ring is as follows Figure 4 As shown, the material of the retaining ring is 1Mn18Cr18N. In the design stage of the retaining ring of the 300MW thermal power turbine generator, the figure 1 the device shown, figure 2 The flow chart shown and image 3 The computer software shown can calculate the calculation result of the high cycle fatigue life of the retaining ring, and the specific steps are as follows:

[0067] Step 1: Calculate the maximum principal stress on the surface of the turbogenerator retaining ring:

[0068] For the turbogenerator retaining ring, the existing finite element calculation and analysis method is used to calculate the maximum principal stress on the surface of the retaining ring under the steady-state rated load condition, at the surface points A and B of the three-dimensional model of the turbogenerator retaining ring D...

Embodiment 2

[0118] For a certain type of 300MW thermal power turbine generator, the working speed is 3000 rpm, and the structure of the low-voltage guard ring is as follows: Figure 4 As shown, the material of the retaining ring is 1Mn18Cr18N. In the manufacturing stage of the retaining ring of the 300MW thermal power turbine generator, the figure 1 the device shown, figure 2 The flow chart shown and image 3 The computer software shown, calculates the monitoring results of the high cycle fatigue life of the retaining ring. The specific steps are:

[0119] The first step to the eighth step: similar to Example 1, the maximum principal stress σ of parts A and B on the inner surface of the 300MW thermal power turbine generator retaining ring M , projected onto the maximum principal stress σ M The normal stress σ in the direction N , stress amplitude σ a , residual stress σ r , mean stress σ m , stress ratio R, stress intensity factor threshold ΔK th R , the limit value of the init...

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Abstract

The invention provides a method for predicting high cycle fatigue life of a steam turbine generator retaining ring and a device for monitoring the high cycle fatigue life of the steam turbine generator retaining ring. The device for monitoring the high cycle fatigue life of the steam turbine generator retaining ring is characterized by consisting of an ultrasonic flaw detector and a computation server, wherein the ultrasonic flaw detector is connected with the steam turbine generator retaining ring and the computation server. The invention has the advantages that: quantitative prediction and quantitative monitoring on the high cycle fatigue life of the steam turbine generator retaining ring are realized; and if the safety of the high cycle fatigue life of the steam turbine generator retaining ring does not meet the requirement, the steam turbine generator retaining ring is required to meet the requirement for the safety of the high cycle fatigue life by redesigning in a design stage or removing surface crackles in a manufacturing stage, thus achieving a technical effect that the high cycle fatigue life of the steam turbine generator retaining ring is quantitatively predicted and monitored.

Description

technical field [0001] The invention relates to a prediction method and a monitoring device for the high-cycle fatigue life of a retaining ring of a turbogenerator, and belongs to the technical field of the turbogenerator. Background technique [0002] In the steady-state rated load operation of the turbogenerator, due to the action of the centrifugal force load, the stable static stress in the turbogenerator guard ring is called the average stress. For a static large-span, tens of tons turbogenerator rotor, under the action of the gravity load of the rotor and the retaining ring itself, compressive stress occurs on the surface of the retaining ring above the rotor center of gravity, and on the surface of the retaining ring below the rotor center of gravity produce tensile stress. During the operation of the turbogenerator, a certain point on the surface of the retaining ring, in addition to bearing the stable average stress caused by the centrifugal force load, when the po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02G01N29/04
Inventor 史进渊汪勇杨宇邓志成王卫国
Owner SHANGHAI POWER EQUIP RES INST
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