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A Comprehensive Failure Judgment Method for Major Power Generation Equipment

A technology for power generation equipment and determination methods, which is applied in the testing, measuring devices, instruments and other directions of machines/structural components, and can solve problems such as complex working conditions, deterioration of tissue properties, and general manufacturing quality.

Inactive Publication Date: 2016-08-17
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As we all know, although the failure analysis is very important at home and abroad, and a lot of research has been carried out, abnormal failure accidents still occur from time to time.
On the one hand, this is due to the interaction and comprehensiveness of the actual situation, such as unsuitable material selection, improper structural design, average manufacturing quality, improper installation methods, conventional detection methods, deterioration of organizational performance, omissions in the maintenance process, incorrect personnel operations, The medium of the working condition is complex, the external environment changes, the failure mechanism is unknown, the protective measures are simple, the management system is not strict, etc.; on the other hand, the limitations and uncertainties of the failure analysis technology itself
For example, the existing failure analysis technology has its applicability in solving the failure problem under a single working condition, but it needs to be further developed and improved in terms of accuracy and effectiveness when analyzing the failure problem under complex working conditions

Method used

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  • A Comprehensive Failure Judgment Method for Major Power Generation Equipment
  • A Comprehensive Failure Judgment Method for Major Power Generation Equipment
  • A Comprehensive Failure Judgment Method for Major Power Generation Equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 :Hydrogen embrittlement and hydrogen bubbling failure mode and analysis

[0034] figure 1 Shown is the fracture appearance of a failed heat transfer titanium tube in a tube sheet in a heat exchanger of a large power generation equipment. It can be seen that the left side of the breach is oval, see figure 1 The shape of the inner wall of (a), and the edge is obviously concave from the outside to the inside, indicating that the outer wall of the heat transfer tube has been subjected to some kind of squeezing force. And there is brittle cracking on the outer wall of another failed heat transfer titanium tube, see figure 1 (b).

[0035] In order to find out the causes of the above-mentioned rare failure phenomena, the project innovatively implemented the following failure analysis strategies:

[0036] (1) X-ray photoelectron spectroscopy surface analysis. Using X-ray photoelectron spectroscopy analysis, it is determined that the Ti element on the surface of the in...

Embodiment 2

[0040] Example 2 : Failure morphology and analysis of mechanical micro-sags

[0041] It is found that the inner wall of the heat transfer tube of a heat exchanger has coin-shaped micro depressions ( Figure 5 (a)). After using scanning electron microscopy and energy spectrum analysis to observe and analyze the micro-area morphology of the circular fracture in the depression, see Figure 5 (b) It was quickly identified that this type of depression was caused by the excessively hard clamping force of the traction fixing head when the heat transfer tube was installed through the plate. Therefore, when the fluid medium in the heat transfer tube flows through the mechanical micro-depression, local turbulence occurs, and the micro-flow field changes. The fluid produces continuous vortex scouring centered on the surface of the depression, and gradually changes with the depression. As the depth becomes larger, the scouring and abrasion effect is intensified, and eventually the pipe wal...

Embodiment 3

[0043] Example 3 : Failure mode and analysis of fretting wear

[0044] Image 6 (a) Shows the rupture on the surface of the heat transfer tube under the support plate in a heat exchanger. It can be seen that there are obvious friction streaks on the outer wall of the tube, and there is also a long bending mechanical cut on the breach, which is obviously the result of accidental cuts when the heat transfer tube passes through the fixing hole of the support plate. At that time, the cut was not completely damaged, but it was exactly on the contact surface of the support plate. Therefore, when the heat exchanger was running, due to the fluctuation of the fluid medium, the heat transfer tube would definitely have irregular fretting wear with the support plate. Image 6 The scanning electron micrograph of (b) clearly shows that there is a ring-shaped wear surface generated by fretting abrasion with the support plate near the cut, and in addition to a layer of loosely distributed metal...

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Abstract

The invention belongs to the technical field of power generation device detection, and specifically relates to a comprehensive failure judgment method for major power generation equipment. The specific steps of the present invention are: 1. Propose an overall analysis strategy, and systematically consider eight influencing factors, including materials, design, manufacture, installation, inspection, operation, maintenance and environment; Combined with the macroscopic test, the so-called micro-area analysis refers to the in-depth analysis of the microscopic characteristics of the surface after the breach is magnified 500 times; 3. Establish a rapid discrimination technology, which can quickly define corrosion wear, erosion wear, composite corrosion, etc. Different failure mechanisms under complex working conditions.

Description

technical field [0001] The invention belongs to the technical field of major power generation equipment detection, and in particular relates to a comprehensive failure judgment method for major power generation equipment. Background technique [0002] Electric power industry is the pillar industry of national economic development, which is directly related to the production and development of other industries. However, due to the structural diversity and complexity of working conditions of power generation equipment, especially heat exchange equipment, abnormal failures occur frequently, resulting in huge economic losses. Therefore, through the failure case study of typical heat exchange equipment, the development of key technologies for failure analysis, protection technology and risk assessment technology of large-scale power generation equipment is the most effective way to ensure the safe operation of equipment, which can bring significant social and economic benefits. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M99/00
Inventor 杨振国龚嶷祝凯
Owner FUDAN UNIV
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