Ultrasonic detection and diagnosis method for hydrogen damages on water-cooling wall pipe of boiler

A water-cooled wall tube and ultrasonic technology, which is applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, can solve the problems of difficult detection, low efficiency and low accuracy, and achieve the effect of improving measurement efficiency, simple principle and convenient operation.

Active Publication Date: 2013-09-11
STATE GRID CORP OF CHINA +2
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose an ultrasonic detection and diagnosis method for boiler water-cooled wall tube hydrogen damage, which is suitable for the boiler water-cooled wall in service Reliable, convenient and rapid detection and diagnosis of tube hydrogen damage

Method used

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  • Ultrasonic detection and diagnosis method for hydrogen damages on water-cooling wall pipe of boiler
  • Ultrasonic detection and diagnosis method for hydrogen damages on water-cooling wall pipe of boiler

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Embodiment

[0021] The inventive method comprises the following steps:

[0022] Step 1. Select a pipe with the same outer diameter as the boiler water wall pipe to be tested and diagnosed as the tested pipe sample, for example, the material is 20G, and the specification is Φ60×6.5mm;

[0023] Step 2. The ultrasonic testing instrument is Hanwei HS610e produced by Wuhan Zhongke Innovation Technology Co., Ltd. The probe adopts A-type pulse reflection shear wave oblique probe, the probe specification is 5P6×6K1, the coupling agent is engine oil, and the surface compensation is 0dB. Grind the shear wave probe according to the outer diameter of the tested pipe sample, so that the probe is in close contact with the detection surface;

[0024] Step 3. Prepare DL-1 type special test block according to the requirements of DL / T820 "Technical Regulations for Ultrasonic Inspection of Pipeline Welded Joints" according to the same type of material of the boiler water wall tube to be tested and diagnosed...

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Abstract

The invention discloses an ultrasonic detection and diagnosis method for hydrogen damages on the water-cooling wall pipe of a boiler. The ultrasonic detection and diagnosis method comprises the following steps of: selecting a pipeline having the same outer diameter as the water-cooling wall pipe needing to be detected and diagnosed, of the boiler, as a detected pipe sample; using an ultrasonic detection instrument with a pulse-reflection type transverse wave angle probe, and causing the probe to be in close contact with the detection surface of the detected pipe sample; preparing a DL-1 type special test block according to the material of the water-cooling wall pipe of the boiler, and calibrating the performances of the ultrasonic detection instrument and the transverse wave angle probe; drawing a distance-amplitude curve by virtue of the DL-1 type special test block; performing ultrasonic detection for transverse defects on the water-cooling wall pipe needing to be detected and diagnosed, of the boiler; analysing the waveform characteristics of ultrasonic wave and the typical waveform characteristics of hydrogen damages, if the diagnosed result is the hydrogen damages, then using the equivalent value of the maximum echo amplitude in a detection echo for evaluating the relative degree of the hydrogen damages in the defect area of the detected pipe sample. The method is a reliable, convenient and rapid ultrasonic detection and diagnosis method.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic flaw detection, and in particular relates to an ultrasonic detection and diagnosis method for hydrogen damage of boiler water-cooled wall tubes. Background technique [0002] Ultrasonic flaw detection uses the influence of the acoustic properties of the material itself or internal defects on the propagation of ultrasonic waves to non-destructively detect the interior and distribution of materials and determine the properties of materials. Ultrasonic flaw detection has a high detection rate of area defects, a wide range of applications, and low detection costs. Low speed, fast speed, on-site use, accurate defect location, high sensitivity, strong penetrability and harmless to the human body. During detection, the ultrasonic wave will be reflected from the defect and a defect wave will appear on the fluorescent screen. The waveform and amplitude of the defect wave will change due to the geometric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 龙会国谢国胜龙毅陈红冬
Owner STATE GRID CORP OF CHINA
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