On-line prediction method for high-temperature pipe damage and longevity

A prediction method and life-span technology, which can be used in the application of stable tension/pressure to test the strength of materials, special data processing applications, instruments, etc., which can solve the problems of difficulty in ensuring accuracy and inability to use online monitoring.

Inactive Publication Date: 2009-08-19
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In China, a number of patented technologies have been used to study the life prediction of high-temperature components, such as Chinese patent CN03134314.7 "Test method for creep life of high-temperature components", CN200610048003.8 "Prediction of life and life consumption of high-temperature component materials Method", CN200710013519.3 "Evaluation method and device for remaining life of high-temperature furnace tube"

Method used

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  • On-line prediction method for high-temperature pipe damage and longevity
  • On-line prediction method for high-temperature pipe damage and longevity
  • On-line prediction method for high-temperature pipe damage and longevity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] Example 1 On-line prediction of damage and service life of T-joints in pipeline systems

[0124] T-joint is a complex structure widely used in factories. Due to the structural discontinuity in the connecting part of the T-joint and the serious stress concentration near the connecting pipe, the T-joint area often fails first and Eventually lead to damage to the entire pipeline system. The creep damage development at the T-shaped joint is simulated by using the prediction method of the invention, and the corresponding strain-damage and strain-life databases are obtained through calculation.

[0125] Material properties

[0126] The material of the T-joint is 0.5Cr0.5Mo0.25V steel, and its creep parameters at 540°C are as follows:

[0127] Table 1 Material parameters of 0.5Cr0.5Mo0.25V steel at 540℃

[0128] E / MPa mu B n g φ A α v ρ 1.6×10 5 0.28 8.495×10 -37 14.45 0.725 1.472 7.963×10 -32 0.43 12.65 0.00534

[0129] Geomet...

Embodiment 2

[0133] Example 2 Prediction of damage and online life of pipe bends in piping systems

[0134] The elbow is the most common complex structure in the main steam pipeline, and it is a complex space surface component. Through the stress analysis of the main steam pipeline, it is found that the bent pipe is the most stressed part in the whole pipeline system. The prediction method of the invention is used to simulate the elbow position of the main steam pipeline of a certain power plant, and the corresponding strain-damage and strain-life databases are obtained through calculation.

[0135] Material properties

[0136] The material of the elbow is the same as in Example 1.

[0137] Geometry

[0138] The average radius of curvature R of the elbow m The pipe size is 1400mm, and the pipe size is 270×40mm. See the attached physical map and finite element grid Figure 9 And attached Figure 10 .

[0139] Using the prediction method of the present invention, the development o...

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Abstract

The invention relates to an online predicting method of damage and service life of a high temperature pipeline. The method comprises the following implementing steps of: (1) carrying out finite element simulation analysis of damage and coupling to the high temperature pipeline; (2) finding out important monitoring parts according to the analysis results, arranging a sensor and monitoring the strain of the sensor; (3) carrying out finite element analysis (including analytical subprogram of a constitutive equation) for different working conditions and establishing database with damage, strain and residual life and strain; and (4) carrying out online inquiry and comparison to strain values detected online and the value of the load working condition and the data in the database so as to obtain the assessment value of corresponding damage and residual life. The online predicting method has the advantages of being capable of carrying out real-time monitoring to the high temperature pipeline in operation while production is carried out normally, reflecting the deformation and damage of the important parts and key parts in time, making correct estimation to the use life and residual life of the pipeline, being beneficial to guaranteeing safe production, adjusting the production load, planning maintenance reasonably and effectively prolonging the service life of production equipment.

Description

【Technical field】 [0001] The invention relates to the field of life prediction of high-temperature components, and relates to a life prediction technology based on strain measurement, which can be used for real-time monitoring of damage and remaining life of high-temperature pipelines. 【Background technique】 [0002] The electric power industry is an important industry related to the national economy and people's livelihood. The thermal power unit is an important part of the power plant, and its service life is closely related to the economy and safety of the power plant operation. The design life of high-temperature and high-pressure pipelines, especially the main steam pipeline, is an important issue of general concern. The main steam pipe material that has been working under high temperature and high pressure for a long time will slowly change its microstructure, mechanical properties, heat resistance and physical properties under the action of temperature and stress. T...

Claims

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Application Information

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IPC IPC(8): G01N3/18G06F19/00
Inventor 王宁涂善东轩福贞王正东陈颖琦陈建钧
Owner EAST CHINA UNIV OF SCI & TECH
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