Method for detecting defect of inner wall of steel pipe for boiler based on phased array technology

Abstract

The invention discloses a method for detecting the defect of the inner wall of a steel pipe for a boiler based on a phased array technology. The method comprises the following steps: S1, detecting a target steel pipe and acquiring a defect map of the inner wall of a target steel pipe; S2, matching the defect map with a preset standard map database and determining defect parameters of the target steel pipe, wherein the standard map database contains a corresponding relation between different defect parameters and corresponding defect map. The method has the advantages of high detection speed, detection accuracy and capability of accurately judging the defect parameters of the inner wall of the pipe for the boiler.

Description

Technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a method for detecting defects on the inner wall of a boiler steel pipe based on phased array technology. Background technique [0002] In recent years, with the construction of supercritical and ultra-supercritical power station boilers, the types of boiler steel pipes have been increasing. In the process of infrastructure and operation, due to ineffective protection measures or water quality, it is easy to cause corrosion and erosion of the inner wall of the pipe; especially in the process of infrastructure construction. However, due to the long equipment construction period and the use of unqualified pipes by many unsatisfied businesses, the boiler’s internal wall corrosion and other defects due to the material itself or improper protection during the infrastructure construction process caused certain difficulties in the installation and operation of the boiler. Mor...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the construction of supercritical and ultra-supercritical power plant boilers, the types of steel pipes used in boilers have continued to increase. During infrastructure construction and operation, due to poor protection measures or water quality, etc., it is easy to cause corrosion and erosion of the inner wall of the pipe; especially during infrastructure construction. Among them, due to the long construction period of the equipment and the use of unqualified pipes by many unscrupulous merchants, the inner wall of the boiler has corrosion and other defects due to the material itself or improper protection during the infrastructure construction process, causing certain difficulties to the installation and operation of the boiler.

Moreover, at present, the ultrasonic detection method is generally used for defects on the inner wall of such pipes. The detection cycle is long and the nature of the defects is not easy to distinguish. Due to the limitation of detection methods, it is easy to cause missed detection.

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