Thickness detection system and method of large vessel stainless steel lining based on eddy current detection

Abstract

The invention discloses a large container stainless steel lining thickness detecting system and method. The detecting system comprises a disc type coil probe and a probe positioning auxiliary device.The disc type coil can be used for applying excitation current and collecting detection signals, and the detection signals include stainless steel lining thickness information; the probe positioning auxiliary device can help a probe in detection to eliminate probe lift-off and deflection to disturb the detection result; according to an eddy current detection signal analysis method, at first, on the basis of samples of different steel lining thicknesses, a steel lining thickness-signal characteristic quantity calibration curve is determined, then, a signal characteristic quantity of a point tobe detected is obtained through the detecting system, finally, on the basis of the calibration curve, a thickness value corresponding to the characteristic quantity obtained through an experiment is extracted on the basis of the calibration curve, and the steel lining thickness of the pointed to be detected is obtained. According to the detecting system and method, fixed point lossless quantitative evaluation for the large container stainless steel lining can be performed, the influence on the detection result can be eliminated and lifted off from the principle, and the system has the advantages that the detecting system is simple in structure, convenient to operate, stable in detecting result, small in involved data size, wide in application range and the like.

Description

technical field [0001] The invention relates to the technical field of non-destructive evaluation of the thickness of stainless steel lining of large vessels, in particular to a detection system and method for the thickness of stainless steel lining of large vessels based on eddy current detection. Background technique [0002] The base of large containers is mostly made of steel. Due to the complex and changeable service environment, they are often affected by material corrosion (commonly seen in containers containing chemical substances) during normal service. Take large containers containing toxic gases or liquids as an example , the destruction of the container body will lead to the leakage of dangerous substances inside the container, which poses a great threat to the safety of life and property. Destruction such as corrosion occurs. Although compared with the steel container body, the stainless steel lining is more difficult to corrode in the harsh service environment...

AI Technical Summary

Problems solved by technology

Although compared with the steel container body, the stainless steel lining is more difficult to corrode in the harsh service environment, but it will inevitably be damaged if the service time is too long, resulting in the inability to safely isolate the influence of the environment on the container body. Thickness testing of linings is critical

[0003] For the evaluation of the thickness of the container, the most commonly used method is ultrasonic testing. However, the contact surface between the stainless steel lining and the container body of a large container is generally fixed by welding. Thickness evaluation, thus greatly restricting the scope of application of ultrasonic testing technology

In addition, ultrasonic testing technology must use couplant, and the surface of the steel lining is directly exposed to harsh environments, so it is not convenient to use couplant

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