Nondestructive testing method and equipment based on resonant pulsed eddy current

Abstract

The invention discloses a nondestructive testing method and equipment based on resonant pulsed eddy current, and the method comprises the following steps: S1, after an excitation coil unit arranged on the outer surface of a jacketed pipe of a tubular reactor is controlled to generate an excitation magnetic field, receiving a secondary magnetic field generated by induction eddy current in the tubular reactor through a detection coil unit, a corresponding induced voltage signal is generated; s2, obtaining the wall thickness of the jacketed pipe, the induction distance between the detection coil unit and the tubular reactor and the humidity in a cavity between the jacketed 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; and S3, obtaining a nondestructive testing model, and carrying out nondestructive testing on the tubular reactor through the nondestructive testing model according to the detection signal. Therefore, nondestructive testing can be accurately and effectively carried out on the tubular reactor.

Description

Technical Field

[0001] The present invention relates to the technical field of non-destructive testing, and in particular to a non-destructive testing method based on resonant pulsed eddy current. Background Art

[0002] During actual operation, tubular reactors are typically jacketed. During operation, if gases such as carbon dioxide mix with the circulating water within the jacket, carbonic acid will form. The combined effects of high operating stress and thermal fatigue loading on the tubular reactor can cause defects such as corrosion pits and cracks on the reactor's outer wall. However, defects on the outer wall of a tubular reactor can affect its safety, necessitating regular nondestructive testing.

[0003] In the related art, since the tubular reactor is disposed in a jacketed tube, it is impossible to accurately and effectively perform non-destructive testing on the tubular reactor. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a non-destructive testing method based on resonant pulsed eddy current, which can accurately and effectively perform non-destructive testing on tubular reactors.

[0005] The technical solution adopted in the present invention is as follows:

[0006] A nondestructive testing method based on resonant pulsed eddy current includes the following steps: S1, after controlling an excitation coil unit arranged on the outer surface of a jacket tube of a tubular reactor to generate an excitation magnetic field, receiving a secondary magnetic field generated by induced eddy currents in the tubular reactor through a detection coil unit, and generating a corresponding induced voltage signal; S2, obtaining the wall thickness of the jacket tube, the induction distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacket tube and the tubular reactor, calculating a magnetic field shielding value based on the wall thickness, the induction distance, and the humidity, and correcting the induced voltage signal based on the magnetic field shielding value to obtain a detection signal; S3, obtaining a nondestructive testing model, and performing nondestructive testing on the tubular reactor based on the detection signal using the nondestructive testing model.

[0007] In one embodiment of the present invention, step S2 specifically includes: S21, calculating the first magnetic field shielding parameter based on the wall thickness; S22, calculating the second magnetic field shielding parameter based on the sensing distance and the humidity; S23, calculating the magnetic field shielding value based on the first magnetic field shielding parameter and the second magnetic field shielding parameter.

[0008] In one embodiment of the present invention, step S21 specifically includes: calculating the product of the wall thickness and the shielding coefficient of the jacket tube to the magnetic field to generate the first magnetic field shielding parameter.

[0009] In one embodiment of the present invention, step S22 specifically includes: obtaining a first distance between the inner wall of the jacket tube and the outer wall of the tubular reactor; calculating the ratio between the first distance and the sensing distance to obtain a humidity ratio; calculating the product of the humidity ratio and the humidity to obtain the second magnetic field shielding parameter.

[0010] In one embodiment of the present invention, step S23 specifically includes: calculating the product of the first magnetic field shielding parameter and the first weight and the product of the second magnetic field shielding parameter and the second weight, and summing them to obtain the magnetic field shielding value.

[0011] A nondestructive testing device based on resonant pulsed eddy current includes: a control module, which is used to control an excitation coil unit arranged on the outer surface of a jacket tube of a tubular reactor to generate an excitation magnetic field, and then receive the secondary magnetic field generated by the induced eddy current in the tubular reactor through a detection coil unit, and generate a corresponding induced voltage signal; an acquisition module, which is used to obtain the wall thickness of the jacket tube, the induction distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacket tube and the tubular reactor, and calculate a magnetic field shielding value based on the wall thickness, the induction distance and the humidity, and correct the induced voltage signal based on the magnetic field shielding value to obtain a detection signal; and a detection module, which is used to obtain a nondestructive testing model and perform nondestructive testing on the tubular reactor based on the detection signal using the nondestructive testing model.

[0012] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the nondestructive testing method based on resonant pulsed eddy current is implemented.

[0013] A non-transitory computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned non-destructive testing method based on resonant pulsed eddy current.

[0014] Beneficial effects of the present invention:

[0015] The nondestructive testing method based on resonant pulsed eddy current of the present invention can accurately and effectively perform nondestructive testing on a tubular reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1Flowchart of a nondestructive testing method based on resonant pulsed eddy current according to an embodiment of the present invention;

[0017] Figure 2 4 is a block diagram of a nondestructive testing device based on resonant pulsed eddy current according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Figure 1 Flowchart of a nondestructive testing method based on resonant pulsed eddy current according to an embodiment of the present invention.

[0020] It should be noted that the nondestructive testing method of the embodiment of the present invention is aimed at a tubular reactor with a jacketed tube arranged outside the tubular reactor. That is to say, the nondestructive testing method of the embodiment of the present invention is used to perform nondestructive testing on a tubular reactor with a jacketed tube.

[0021] like Figure 1 As shown, the nondestructive testing method based on resonant pulsed eddy current according to an embodiment of the present invention may include the following steps:

[0022] S1, after controlling the excitation coil unit disposed on the outer surface of the jacket tube of the tubular reactor to generate an excitation magnetic field, the detection coil unit receives the secondary magnetic field generated by the induced eddy current in the tubular reactor and generates a corresponding induced voltage signal.

[0023] Specifically, an excitation coil unit and a detection coil unit can be pre-installed on the outer surface of the tubular reactor's jacket. During nondestructive testing of the tubular reactor, the excitation coil unit can be controlled to generate an excitation magnetic field. This generates eddy currents in the tubular reactor and forms a secondary magnetic field. The detection coil unit receives this secondary magnetic field and generates a corresponding induced voltage signal. The stronger the secondary magnetic field received by the detection coil unit, the greater the induced voltage generated.

[0024] S2, obtaining the wall thickness of the jacket tube, the induction distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacket tube and the tubular reactor, and calculating the magnetic field shielding value based on the wall thickness, the induction distance, and the humidity, and correcting the induced voltage signal based on the magnetic field shielding value to obtain a detection signal.

[0025] Specifically, during the actual detection process, the jacketed tube and the cavity between the jacketed tube and the tubular reactor will have a certain impact on the induced voltage signal, thereby affecting the accuracy of the detection. Therefore, the induced voltage signal needs to be corrected.

[0026] Specifically, in one embodiment of the present invention, step S2 specifically includes the following steps:

[0027] S21, calculating a first magnetic field shielding parameter according to the wall thickness.

[0028] Specifically, the first magnetic field shielding parameter may be generated by calculating the product of the wall thickness and the shielding coefficient of the jacket pipe to the magnetic field.

[0029] The shielding coefficient of the jacket tube against the magnetic field can be the magnetic field shielding rate of the current jacket tube material. The magnetic field shielding rates of jacket tubes of different materials can be obtained in advance through experiments and a shielding coefficient table can be generated. This shielding coefficient table can be directly called when performing nondestructive testing on the tubular reactor.

[0030] S22, calculating a second magnetic field shielding parameter according to the sensing distance and the humidity.

[0031] Specifically, the first distance between the inner wall of the jacket tube and the outer wall of the tubular reactor can be obtained first, and the ratio between the first distance and the sensing distance can be calculated to obtain the humidity ratio, and then the product of the humidity ratio and the humidity can be calculated to obtain the second magnetic field shielding parameter.

[0032] S23, calculating a magnetic field shielding value according to the first magnetic field shielding parameter and the second magnetic field shielding parameter.

[0033] In one embodiment of the present invention, the products of the first magnetic field shielding parameter and the first weight and the second magnetic field shielding parameter and the second weight are calculated and summed to obtain the magnetic field shielding value. The first weight and the second weight can be calibrated according to actual conditions.

[0034] In one embodiment of the present invention, after calculating the magnetic field shielding value, the magnetic field strength of the secondary magnetic field received by the detection coil unit can be corrected using the following formula:

[0035]

[0036] Among them, k is the adjustment coefficient, P is the magnetic field shielding value, B d To detect the magnetic field strength of the secondary magnetic field currently received by the coil unit, B j is the corrected magnetic field strength.

[0037] Furthermore, after obtaining the corrected magnetic field strength, the induced voltage signal is corrected according to the relationship between the magnetic field strength and the induced voltage to obtain a detection signal.

[0038] S3, obtaining a nondestructive testing model, and performing nondestructive testing on the tubular reactor according to the detection signal using the nondestructive testing model.

[0039] In one embodiment of the present invention, before obtaining a nondestructive testing model, a plurality of tubular reactors with different types of defects may be collected and labeled, and then the tubular reactors with different types of defects (without jacketed tubes) may be placed in a preset target scene, respectively, and the excitation coil unit may be controlled to generate an excitation magnetic field, and the secondary magnetic field generated by the induced eddy current in the tubular reactor may be received by the detection coil unit, and a corresponding detection signal to be trained may be generated, wherein the preset target scene includes: the distance between the detection coil unit and the tubular reactor is the induction spacing, and the magnetic field characteristics of the excitation magnetic field generated by the excitation coil unit are the same as the magnetic field characteristics of the excitation magnetic field generated by the excitation coil unit during actual detection.

[0040] Then, the detection signal to be trained and the corresponding defect type are input into the non-destructive testing network for training to obtain a non-destructive testing model. After obtaining the non-destructive testing model, the non-destructive testing model is used to perform non-destructive testing on the tubular reactor based on the detection signal.

[0041] In summary, according to the nondestructive testing method based on resonant pulsed eddy current in an embodiment of the present invention, after controlling the excitation coil unit disposed on the outer surface of the jacket tube of the tubular reactor to generate an excitation magnetic field, the secondary magnetic field generated by the induced eddy current in the tubular reactor is received by the detection coil unit, and a corresponding induced voltage signal is generated. The wall thickness of the jacket tube, the induction distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacket tube and the tubular reactor are obtained, and the magnetic field shielding value is calculated based on the wall thickness, the induction distance, and the humidity. The induced voltage signal is corrected based on the magnetic field shielding value to obtain a detection signal, and a nondestructive testing model is obtained. The tubular reactor is nondestructively tested based on the detection signal using the nondestructive testing model. In this way, the tubular reactor can be accurately and effectively tested for nondestructive testing.

[0042] Corresponding to the nondestructive testing method based on resonant pulsed eddy current in the above embodiment, the present invention also proposes a nondestructive testing device based on resonant pulsed eddy current.

[0043] like Figure 2 As shown, the nondestructive testing equipment based on resonant pulsed eddy current according to the embodiment of the present invention may include: a control module 100 , an acquisition module 200 and a detection module 300 .

[0044] Among them, the control module 100 controls the excitation coil unit set on the outer surface of the jacket tube of the tubular reactor to generate an excitation magnetic field, and then receives the secondary magnetic field generated by the induced eddy current in the tubular reactor through the detection coil unit, and generates a corresponding induced voltage signal; the acquisition module 200 is used to obtain the wall thickness of the jacket tube, the induction distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacket tube and the tubular reactor, and calculate the magnetic field shielding value based on the wall thickness, induction distance and humidity, and correct the induced voltage signal based on the magnetic field shielding value to obtain a detection signal; the detection module 300 is used to obtain a non-destructive testing model and perform non-destructive testing on the tubular reactor based on the detection signal using the non-destructive testing model.

[0045] In one embodiment of the present invention, the acquisition module 200 is specifically used to: calculate the first magnetic field shielding parameter based on the wall thickness; calculate the second magnetic field shielding parameter based on the sensing distance and humidity; and calculate the magnetic field shielding value based on the first magnetic field shielding parameter and the second magnetic field shielding parameter.

[0046] In one embodiment of the present invention, the acquisition module 200 is specifically configured to calculate the product of the wall thickness and the shielding coefficient of the jacket pipe to the magnetic field to generate the first magnetic field shielding parameter.

[0047] In one embodiment of the present invention, the acquisition module 200 is specifically used to: obtain a first distance between the inner wall of the jacket tube and the outer wall of the tubular reactor; calculate the ratio between the first distance and the sensing distance to obtain a humidity ratio; calculate the product of the humidity ratio and the humidity to obtain a second magnetic field shielding parameter.

[0048] In one embodiment of the present invention, the acquisition module 200 is specifically configured to respectively calculate the product of the first magnetic field shielding parameter and the first weight and the product of the second magnetic field shielding parameter and the second weight, and sum them up to obtain the magnetic field shielding value.

[0049] It should be noted that for details not disclosed in the non-destructive testing equipment based on resonant pulsed eddy current in the embodiment of the present invention, please refer to the details disclosed in the above-mentioned non-destructive testing method based on resonant pulsed eddy current, and the specific details will not be described here.

[0050] According to an embodiment of the present invention, the nondestructive testing equipment based on resonant pulsed eddy current generates an excitation magnetic field by controlling the excitation coil unit disposed on the outer surface of the jacket tube of the tubular reactor through the control module, and then receives the secondary magnetic field generated by the induced eddy current in the tubular reactor through the detection coil unit, and generates a corresponding induced voltage signal. The acquisition module obtains the wall thickness of the jacket tube, the induction distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacket tube and the tubular reactor, calculates the magnetic field shielding value based on the wall thickness, the induction distance, and the humidity, and corrects the induced voltage signal based on the magnetic field shielding value to obtain a detection signal. The detection module obtains a nondestructive testing model, and the nondestructive testing model is used to perform nondestructive testing on the tubular reactor based on the detection signal. Thus, the tubular reactor can be accurately and effectively subjected to nondestructive testing.

[0051] Corresponding to the above embodiment, the present invention further provides a computer device.

[0052] The computer device of an embodiment of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the nondestructive testing method based on resonant pulsed eddy current of the above embodiment is implemented.

[0053] The computer device according to the embodiment of the present invention can accurately and effectively perform non-destructive testing on a tubular reactor.

[0054] Corresponding to the above embodiment, the present invention further proposes a non-transitory computer-readable storage medium.

[0055] The non-transitory computer-readable storage medium of the embodiment of the present invention stores a computer program, which, when executed by a processor, implements the above-mentioned non-destructive testing method based on resonant pulsed eddy current.

[0056] The non-transitory computer-readable storage medium according to the embodiment of the present invention can accurately and effectively perform non-destructive testing on a tubular reactor.

[0057] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0058] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0060] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0061] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing module, or each unit may exist physically separately, or two or more units may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

[0062] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A nondestructive testing method based on resonant pulsed eddy current, characterized in that: The following steps are involved: S1, after controlling the excitation coil unit disposed on the outer surface of the jacket tube of the tubular reactor to generate an excitation magnetic field, receiving the secondary magnetic field generated by the induced eddy current in the tubular reactor through the detection coil unit, and generating a corresponding induced voltage signal; S2, obtaining a wall thickness of the jacketed tube, an induction distance between the detection coil unit and the tubular reactor, and a humidity in a cavity between the jacketed tube and the tubular reactor, calculating a magnetic field shielding value based on the wall thickness, the induction distance, and the humidity, and correcting the induced voltage signal based on the magnetic field shielding value to obtain a detection signal; S3, obtaining a nondestructive testing model, and performing nondestructive testing on the tubular reactor according to the detection signal using the nondestructive testing model.

2. The nondestructive testing method based on resonant pulsed eddy current according to claim 1, characterized in that: Step S2 specifically includes: S21, calculating a first magnetic field shielding parameter according to the wall thickness; S22, calculating a second magnetic field shielding parameter according to the sensing distance and the humidity; S23: Calculate the magnetic field shielding value according to the first magnetic field shielding parameter and the second magnetic field shielding parameter.

3. The nondestructive testing method based on resonant pulsed eddy current according to claim 2, characterized in that: Step S21 specifically includes: The product of the wall thickness and the shielding coefficient of the jacket pipe against the magnetic field is calculated to generate the first magnetic field shielding parameter.

4. The nondestructive testing method based on resonant pulsed eddy current according to claim 2, characterized in that: Step S22 specifically includes: obtaining a first distance between an inner wall of the jacket tube and an outer wall of the tubular reactor; calculating a ratio between the first distance and the sensing distance to obtain a humidity ratio; The product of the humidity ratio and the humidity is calculated to obtain the second magnetic field shielding parameter.

5. The nondestructive testing method based on resonant pulsed eddy current according to claim 2, characterized in that: Step S23 specifically includes: The products of the first magnetic field shielding parameter and the first weight and the second magnetic field shielding parameter and the second weight are calculated respectively, and the sums are performed to obtain the magnetic field shielding value.

6. A non-destructive testing device based on resonant pulsed eddy current, characterized in that: include: a control module configured to control an excitation coil unit disposed on an outer surface of a jacketed tube of the tubular reactor to generate an excitation magnetic field, receive a secondary magnetic field generated by induced eddy currents in the tubular reactor through a detection coil unit, and generate a corresponding induced voltage signal; an acquisition module, the acquisition module being configured to acquire a wall thickness of the jacketed tube, an induction distance between the detection coil unit and the tubular reactor, and a humidity in a cavity between the jacketed tube and the tubular reactor, calculate a magnetic field shielding value based on the wall thickness, the induction distance, and the humidity, and correct the induced voltage signal based on the magnetic field shielding value to acquire a detection signal; A detection module is used to obtain a non-destructive detection model and perform non-destructive detection on the tubular reactor according to the detection signal using the non-destructive detection model.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the non-destructive testing method based on resonant pulsed eddy current according to any one of claims 1 to 5 is implemented.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, a non-destructive testing method based on resonant pulsed eddy current according to any one of claims 1 to 5 is implemented.

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