Low-frequency array eddy current detection device and detection method for corrosion defects of steel pipe inner wall

Abstract

The invention relates to a low-frequency array eddy current detection device and a detection method for corrosion defects of a steel pipe inner wall. According to the technical scheme, the low-frequency array eddy current detection device comprises an eddy current detection main machine, a connecting wire and a low-frequency array eddy current probe, wherein the eddy current detection main machineis connected with the low-frequency array eddy current probe through the connecting wire; a main machine shell body is provided with a display device and a probe connection socket respectively; the shell body is internally provided with a low-frequency oscillator, a lithium battery, a controller, an amplifier, a balance filter, a phase shifter, a gain adjustable amplifier and a digital to analogconverter respectively. According to the low-frequency array eddy current detection device, the interference of space scattering leakage magnetic flux is eliminated through a magnetic shielding technology of a magnetic tank and shielding coils and the defect resolution is improved; eight detection coils can be used for imaging independently in a detection process and the detection sensitivity keeps consistent all the time so that leak detection of the defects is avoided; the defects of the steel pipe inner wall of a heated surface covered with the probe can be detected in one-step operation and reciprocated operation is not needed; the low-frequency array eddy current detection device is convenient to use and has a good effect.

Description

technical field [0001] The invention relates to the technical field of eddy current detection of boiler heating surface tubes in electric power systems, in particular to a low-frequency array eddy current detection device and a method for detecting corrosion defects on the inner wall of a steel pipe. Background technique [0002] The heating surface tubes of power plant boilers have been in a high-temperature and high-pressure working environment for a long time, and the inner and outer surfaces of the tubes are prone to defects such as corrosion wear, hydrogen damage, corrosion pitting, oxidation pits, cracks, flue gas corrosion, and corrosion holes. The continuous development of defects leads to leakage , which seriously threatens the safe operation of the unit and causes unplanned outage of the unit. Therefore, regular inspection of the inner wall corrosion of the steel pipe on the heating surface is an effective means to prevent accidents. Through the inspection, the se...

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Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the object of the present invention is to provide a low-frequency array eddy current detection device, which can effectively solve the problem of detection of boiler heating surface defects

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