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Evaluation Method for Hydrogen Damage of Boiler Water Wall Tubes

A water-cooled wall tube, hydrogen damage technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, etc., can solve the problems of accurate classification of hydrogen damage, failure to provide hydrogen damage risk assessment, etc., to achieve convenient operation, loose testing environment requirements, and procedures. simple effect

Active Publication Date: 2015-09-09
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these methods accurately graded the degree of hydrogen damage, nor did they provide a hydrogen damage risk assessment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0023] (2), choose a pipeline consistent with the material and specifications of the sampling tube of step (1) as the sample;

[0024] (3) Equipped with an ultrasonic detector with a longitudinal wave pulse reflection straight probe and consumable couplant. Use the test sample taken in step (2) to adjust the zero offset of the ultrasonic detector; the ultrasonic detector equipped with this institute adopts the Hanwei HS610e ultrasonic detector produced by China Wuhan Zhongke Innovation Technology Co., Ltd. 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;

[0025] (4), u...

Embodiment 2

[0034] Steps (1)~(3) are with embodiment 1;

[0035] (4), using conventional methods, utilizing the ultrasonic detector and coupling agent calibrated through step (3), carry out ultrasonic detection to 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)~(6) are the same as in Example 1;

[0037] (7), using conventional methods, utilizing the ultrasonic detector and coupling agent calibrated through step (3), carry out ultrasonic detection to the sampling pipe of step (1), and obtain the sound pressure amplitude and sound path value records of ultrasonic echo five times;

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

[0039] (11), use step (10) to evaluate hydrogen damage degree factor Δ of boiler water-cooled wall tubes, and make hydrogen damage assessment conclusions for boiler water-cooled wall tubes according to the conventional hydrogen damage classification cha...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/11
Inventor 龙会国龙毅谢国胜
Owner STATE GRID HUNAN ELECTRIC POWER
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