Assessment method of hydrogen damage to water wall tube of boiler

A technology for water-cooled tubes and hydrogen damage, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves. It can solve the problems of accurate classification of hydrogen damage and no risk assessment of hydrogen damage. simple effect

Active Publication Date: 2014-01-22
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these methods accurately graded the degree of hydr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take one of the wall tubes of the water-cooled wall tubes of the boiler involved in the evaluation as a sample tube;

[0023] (2) Select a pipe with the same material and specification as the sampling pipe in step (1) as the test sample;

[0024] (3) Equipped with an ultrasonic detector with longitudinal wave pulse reflection straight probe and consumable coupling agent. Use the test sample taken in step (2) to adjust the zero offset of the ultrasonic detector; the ultrasonic detector equipped with the institute adopts the Hanwei HS610e ultrasonic detector produced by Wuhan Zhongke Innovation Technology Co., Ltd., China. The longitudinal wave pulse reflection straight probe of this ultrasonic detector adopts the commercially available general-purpose A-type pulse reflection straight longitudinal wave probe, the frequency is 5MHz, and the chip diameter is Ф6mm; the coupling agent is commercially available ordinary engine oil, and the surface compensation is 0dB;

[...

Embodiment 2

[0034] Steps (1) to (3) are the same as in Example 1;

[0035] (4) Using conventional methods, use the ultrasonic detector and coupling agent calibrated in step (3) to perform ultrasonic testing on the sample taken in step (2), and obtain the sound pressure amplitude and sound path value of the ultrasonic echo Recorded five times;

[0036] Steps (5) to (6) are the same as in Example 1;

[0037] (7) Using the conventional method, use the ultrasonic detector and coupling agent calibrated in step (3) to conduct ultrasonic detection on the sampling tube in step (1), and obtain the sound pressure amplitude and sound path value records of the ultrasonic echo five times;

[0038] Steps (8) to (10) are the same as in Example 1;

[0039] (11) Use the factor value Δ of the degree of hydrogen damage to the boiler water-cooled wall tubes obtained in step (10) to draw a hydrogen damage assessment conclusion for the boiler water-cooled wall tubes based on the conventional hydrogen damage...

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PUM

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Abstract

The invention discloses an assessment method of hydrogen damage to a water wall tube of a boiler. The method comprises the steps as follows: 1), a sampling tube in the water wall tube of the boiler is assessed; 2), a test object is selected; 3), a supersonic detector is equipped, 4), the test object is subjected to supersonic detection; 5), according to the step 4), a product logarithmic function and a sonic path distance graph are established; 6); a supersonic attenuation coefficient a0 of the test object is obtained; 7), supersonic detection of the sampling tube is performed; 8), according to the step 7), a product logarithmic function and a sonic path distance graph are established; 9), a supersonic attenuation coefficient a1 of the sampling tube is obtained; 10), a hydrogen damage degree factor value delta of the water wall tube of the boiler is obtained; and 11), an assessment conclusion of the hydrogen damage to the water wall tube of the boiler is drawn. According to the method, special processing of the tested material is not required, the process is simple, the operation is convenient and rapid, the conclusion is accurate, the requirement for the detection environment is less strict, and the efficiency is substantially improved.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a hydrogen damage assessment method for boiler water-cooled wall tubes, which is suitable for grading the hydrogen damage of metal materials and evaluating the fracture risk. Background technique [0002] Boiler water-cooled wall tubes are prone to corrosion under deposits and hydrogen corrosion cracks during operation. Power plants at home and abroad have repeatedly experienced tube burst failures caused by severe hydrogen corrosion under deposits. At present, there are velocity ratio method, attenuation method and backscatter method for ultrasonic detection of hydrogen damage to metal materials. However, none of these methods accurately graded the degree of hydrogen damage, nor did they provide a hydrogen damage risk assessment. Therefore, according to the characteristics of hydrogen corrosion cracks, it is particularly important to classify the deg...

Claims

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Application Information

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IPC IPC(8): G01N29/11
Inventor 龙会国龙毅谢国胜
Owner STATE GRID HUNAN ELECTRIC POWER
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