CN-120446273-B - Nondestructive testing method and equipment based on resonant pulse eddy current

CN120446273BCN 120446273 BCN120446273 BCN 120446273BCN-120446273-B

Abstract

The invention discloses a nondestructive testing method and equipment based on resonance type pulse eddy current, wherein the method comprises the following steps of S1, after an exciting coil unit arranged on the outer surface of a jacket pipe of a pipe reactor is controlled to generate an exciting magnetic field, receiving a secondary magnetic field generated by induced eddy current in the pipe reactor through a detection coil unit and generating a corresponding induced voltage signal, S2, obtaining the wall thickness of the jacket pipe, the induction distance between the detection coil unit and the pipe reactor and the humidity in a cavity between the jacket pipe and the pipe reactor, calculating a magnetic field shielding value according to the wall thickness, the induction distance and the humidity, correcting the induced voltage signal according to the magnetic field shielding value to obtain a detection signal, S3, obtaining a nondestructive testing model, and carrying out nondestructive testing on the pipe reactor according to the detection signal through the nondestructive testing model. Therefore, nondestructive detection can be accurately and effectively performed on the tubular reactor.

Inventors

SONG GAOFENG
DING CHUNXIONG
ZHENG KAI
ZHU QINGNAN
CHEN RONGHUA
YU YANPING
HUAN DONG
YUAN YING

Assignees

江苏省特种设备安全监督检验研究院

Dates

Publication Date: 20260505
Application Date: 20250514

Claims (8)

1. The nondestructive testing method based on the resonant pulse eddy current is characterized by comprising the following steps of: s1, after an excitation coil unit arranged on the outer surface of a jacket pipe of a tubular reactor is controlled to generate an excitation magnetic field, a detection coil unit is used for receiving a secondary magnetic field generated by eddy current induced in the tubular reactor and generating a corresponding induction voltage signal; S2, obtaining the wall thickness of the jacket pipe, the induction distance between the detection coil unit and the tubular reactor and the humidity in a cavity between the jacket pipe and the tubular reactor, calculating a magnetic field shielding value according to the wall thickness, the induction distance and the humidity, and correcting the induction voltage signal according to the magnetic field shielding value to obtain a detection signal; s3, obtaining a nondestructive testing model, and carrying out nondestructive testing on the tubular reactor according to the testing signals through the nondestructive testing model.
2. The method for non-destructive testing based on resonant pulsed eddy currents according to claim 1, wherein step S2 comprises: S21, calculating a first magnetic field shielding parameter according to the wall thickness; s22, calculating a second magnetic field shielding parameter according to the induction distance and the humidity; s23, calculating the magnetic field shielding value according to the first magnetic field shielding parameter and the second magnetic field shielding parameter.
3. The method for non-destructive testing based on resonant pulsed eddy currents according to claim 2, wherein step S21 comprises: The product of the wall thickness and the shielding factor of the jacket pipe against the magnetic field is calculated to generate the first magnetic field shielding parameter.
4. The method for non-destructive testing based on resonant pulsed eddy currents according to claim 2, wherein step S22 comprises: Obtaining a first interval between the inner wall of the jacket pipe and the outer wall of the tubular reactor; calculating the ratio between the first spacing and the sensing spacing to obtain a humidity ratio; and calculating the product of the humidity ratio and the humidity to obtain the second magnetic field shielding parameter.
5. The method for non-destructive testing based on resonant pulsed eddy currents according to claim 2, wherein step S23 comprises: And respectively calculating the products of the first magnetic field shielding parameter and the first weight and the products of the second magnetic field shielding parameter and the second weight, and summing the products to obtain the magnetic field shielding value.
6. A resonant pulsed eddy current based non-destructive testing apparatus comprising: The control module is used for receiving a secondary magnetic field generated by the induced eddy in the tubular reactor through the detection coil unit after controlling the excitation coil unit arranged on the outer surface of the jacket pipe of the tubular reactor to generate an excitation magnetic field, and generating a corresponding induced voltage signal; The acquisition module is used for acquiring the wall thickness of the jacket pipe, the induction distance between the detection coil unit and the tubular reactor and the humidity in the cavity between the jacket pipe and the tubular reactor, calculating a magnetic field shielding value according to the wall thickness, the induction distance and the humidity, and correcting the induction voltage signal according to the magnetic field shielding value so as to acquire a detection signal; the detection module is used for acquiring a nondestructive detection model and carrying out nondestructive detection on the tubular reactor according to the detection signal through the nondestructive detection model.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements a method for non-destructive inspection based on resonant pulse eddy currents according to any one of claims 1-5 when executing the computer program.
8. A non-transitory computer readable storage medium, having stored thereon a computer program, characterized in that the program, when executed by a processor, implements a resonant pulsed eddy current based non-destructive testing method according to any one of claims 1-5.

Description

Nondestructive testing method and equipment based on resonant pulse eddy current Technical Field The invention relates to the technical field of nondestructive testing, in particular to a nondestructive testing method based on resonant pulse eddy currents. Background In actual operation, the tubular reactor is usually sleeved with a jacket pipe. In the actual working process, once the circulating water in the jacket pipe is mixed with carbon dioxide and other gases, carbonic acid can be formed, and under the combined action of high working stress and thermal fatigue load born by the tubular reactor, the defects such as corrosion pits or corrosion cracks and the like can be caused on the outer wall of the tubular reactor. However, once the outer wall of the tubular reactor is defective, the safety of the use of the tubular reactor is affected, and thus, it is required to perform nondestructive inspection of the tubular reactor periodically. In the related art, since the tubular reactor is disposed in the jacket pipe, the tubular reactor cannot be accurately and effectively subjected to nondestructive inspection. Disclosure of Invention The invention provides a nondestructive testing method based on resonant pulse eddy current, which can accurately and effectively perform nondestructive testing on a tubular reactor. The technical scheme adopted by the invention is as follows: A nondestructive testing method based on resonance type pulse eddy current includes the following steps of S1, after an excitation coil unit arranged on the outer surface of a jacket pipe of a pipe reactor is controlled to generate an excitation magnetic field, receiving a secondary magnetic field generated by induced eddy current in the pipe reactor through a detection coil unit and generating a corresponding induced voltage signal, S2, obtaining the wall thickness of the jacket pipe, the induction distance between the detection coil unit and the pipe reactor and the humidity in a cavity between the jacket pipe and the pipe reactor, calculating a magnetic field shielding value according to the wall thickness, the induction distance and the humidity, correcting the induced voltage signal according to the magnetic field shielding value to obtain a testing signal, and S3, obtaining a nondestructive testing model and conducting nondestructive testing on the pipe reactor according to the testing signal through the nondestructive testing model. In one embodiment of the invention, the step S2 specifically comprises the steps of S21, S22, S23, and S23, wherein the first magnetic shielding parameter is calculated according to the wall thickness, the second magnetic shielding parameter is calculated according to the induction distance and the humidity, and the magnetic shielding value is calculated according to the first magnetic shielding parameter and the second magnetic shielding parameter. In one embodiment of the invention step S21 specifically comprises calculating the product of the wall thickness and the shielding factor of the jacket sleeve against the magnetic field to generate the first magnetic field shielding parameter. In one embodiment of the invention, the step S22 specifically comprises the steps of obtaining a first interval between the inner wall of the jacketed pipe and the outer wall of the tubular reactor, calculating a ratio between the first interval and the induction interval to obtain a humidity ratio, and calculating a product of the humidity ratio and the humidity to obtain the second magnetic field shielding parameter. In one embodiment of the present invention, step S23 specifically includes calculating products of the first magnetic shielding parameter and the first weight and products of the second magnetic shielding parameter and the second weight, respectively, and summing the products to obtain the magnetic shielding value. The nondestructive testing equipment based on the resonance type pulse eddy current comprises a control module, an acquisition module and a detection module, wherein the control module is used for receiving a secondary magnetic field generated by the eddy current induced in a tubular reactor through a detection coil unit after controlling an excitation coil unit arranged at the outer surface of a jacket pipe of the tubular reactor to generate an excitation magnetic field, the acquisition module is used for acquiring the wall thickness of the jacket pipe, the induction distance between the detection coil unit and the tubular reactor and the humidity in a cavity between the jacket pipe and the tubular reactor, calculating a magnetic field shielding value according to the wall thickness, the induction distance and the humidity, and correcting the induction voltage signal according to the magnetic field shielding value to acquire a detection signal, and the detection module is used for acquiring a nondestructive testing model and carrying out nondestructive testing on the tubular reactor accordin