Device for monitoring service lives of valve casing of steam turbine and crack propagations of cylinder and method

A technology of crack extension life and crack extension, applied in the field of steam turbines, can solve problems such as brittle fracture of valve casings and cylinders, damage accidents of steam turbines, etc.

Active Publication Date: 2012-06-20
SHANGHAI POWER EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the cracks in the valve casing and cylinder of the steam turbine expand to the critical crack size where there are cracks in the valve casing and cylinder, brittle fracture may occur in the valve casing and cylinder of the steam turbine, resulting in damage to the steam turbine
The existing steam turbine valve casing and cylinder life monitoring technology provides a monitoring method for the crack initiation life of the steam turbine valve casing and cylinder, but there is no suitable method for monitoring the crack growth life of the steam turbine valve casing and cylinder in service. Apparatus and methods are available

Method used

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  • Device for monitoring service lives of valve casing of steam turbine and crack propagations of cylinder and method
  • Device for monitoring service lives of valve casing of steam turbine and crack propagations of cylinder and method
  • Device for monitoring service lives of valve casing of steam turbine and crack propagations of cylinder and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The structure of the valve casing of the high-pressure main steam regulating valve of a certain type of 300MW steam turbine is as follows: Figure 4 As shown, during the service period of the 300MW steam turbine, 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 crack growth life of the high-pressure main steam regulating valve valve casing.

[0079] Step 1: During the overhaul of the steam turbine cylinder, use an ultrasonic flaw detector to determine the location and size of the crack. It is measured that there is an oval crack on the inner surface part B of the high-pressure main steam valve regulating valve casing of the 300MW steam turbine. Radius is a =2mm, c=10mm;

[0080] Step 2: Establish the mechanical model of the three-dimensional finite element calculation of the valve housing and cylinder of the steam turbine; use the existing finite element analysis techno...

Embodiment 2

[0107] The structure of the high-pressure inner cylinder of a certain type of 300MW steam turbine is as follows: Figure 5 As shown, during the service period of the 300MW steam turbine, the figure 1 the device shown, figure 2 The flow chart shown and image 3 The computer software shown is used to calculate the calculation result of the crack growth life of the high-pressure inner cylinder.

[0108] Step 1: During the inspection and maintenance of the steam turbine cylinder, use an ultrasonic flaw detector to determine the location and size of the crack. Use an ultrasonic flaw detector to measure an oval crack on the outer surface of the high-pressure inner cylinder of the 300MW steam turbine. Shaft radius is a =2mm, c=10mm;

[0109] The second step: establish the mechanical model of the three-dimensional finite element calculation of the valve casing and cylinder of the steam turbine; use the existing finite element analysis technology to calculate the cold start, warm ...

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Abstract

The invention provides a device and a method for monitoring crack propagation life of a valve casing and a cylinder of a turbine. The method includes the specific steps of: flaw detection and determination of crack size of the valve casing and the cylinder of the turbine; computation of maximum main stress, a critical crack size, a crack propagation life, outer surface crack propagation life accumulation loss, an outer surface crack propagation residue life, inner surface crack propagation life accumulation loss, and an inner surface crack propagation residue life of parts where the crack is; controlling the crack propagation residue life of the turbine valve casing and cylinder; and printing an output result. The device has the advantages that online calculation and regular monitoring of the crack propagation residual life of the valve casing and the cylinder of the turbine are realized, if the crack propagation residual lives of the valve casing and the cylinder of the turbine are over short, scheduled heavy repair (A-level repair) is arranged in time so as to reasonably utilize the crack propagation residual lives of the valve casing and the cylinder of the turbine, and a technical effect of regularly monitoring the crack propagation residual lives of the valve casing and the cylinder of the turbine is achieved.

Description

technical field [0001] The invention relates to a device and a method for monitoring the crack extension life of a valve housing and a cylinder of a steam turbine, and belongs to the technical field of steam turbines. Background technique [0002] The valve casing and cylinder of the steam turbine are characterized by large dimensions, and large principal stresses are generated in the valve casing and cylinder during the start-up, shutdown and overspeed tests of the steam turbine. No cracks can be found in the flaw detection inspection during the casting and processing of the valve casing and cylinder of the steam turbine. Under the action of the main stress of the valve casing and cylinder during the operation of the steam turbine, it may expand into visible cracks in the flaw detection inspection. Under the action of the large principal stress on the valve casing and cylinder during the operation of the steam turbine, the flaw detection inspection of the valve casing and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D21/00
Inventor 史进渊杨宇邓志成汪勇刘传亮
Owner SHANGHAI POWER EQUIP RES INST
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