A non-destructive testing method and apparatus based on resonant pulsed eddy currents

Abstract

This invention discloses a non-destructive testing method and device based on resonant pulsed eddy currents. The method includes the following steps: S1, after controlling an excitation coil unit located on the outer surface of the jacket tube of a tubular reactor to generate an excitation magnetic field, a detection coil unit receives the secondary magnetic field generated by the induced eddy currents in the tubular reactor and generates a corresponding induced voltage signal; S2, 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. A magnetic field shielding value is calculated based on the wall thickness, induction distance, and humidity. The induced voltage signal is then corrected based on the magnetic field shielding value to obtain a detection signal; S3, a non-destructive testing model is obtained, and the tubular reactor is subjected to non-destructive testing based on the detection signal using the non-destructive testing model. Therefore, non-destructive testing of the tubular reactor can be performed accurately and effectively.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology, and specifically to a nondestructive testing method based on resonant pulsed eddy currents. Background Technology

[0002] In actual operation, tubular reactors are typically fitted with a jacket. During operation, if gases such as carbon dioxide mix with the circulating water inside the jacket, carbonic acid will form. Under the combined effects of high operating stress and thermal fatigue loads, this will lead to defects such as pitting or cracking on the outer wall of the tubular reactor. However, once defects appear on the outer wall of the tubular reactor, it will affect the safety of its operation. Therefore, regular non-destructive testing of tubular reactors is necessary.

[0003] In related technologies, because tubular reactors are located inside jacketed tubes, it is impossible to accurately and effectively perform non-destructive testing on tubular reactors. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this 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 this invention is as follows:

[0006] A non-destructive testing method based on resonant pulsed eddy current includes the following steps: S1, after controlling an excitation coil unit located on the outer surface of a jacketed tube of a tubular reactor to generate an excitation magnetic field, a 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; S2, the wall thickness of the jacketed tube, the sensing distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacketed tube and the tubular reactor are obtained, and a magnetic field shielding value is calculated based on the wall thickness, the sensing distance, and the humidity, and the induced voltage signal is corrected based on the magnetic field shielding value to obtain a detection signal; S3, a non-destructive testing model is obtained, and the tubular reactor is subjected to non-destructive testing based on the detection signal using the non-destructive testing model.

[0007] In one embodiment of the present invention, step S2 specifically includes: S21, calculating a first magnetic field shielding parameter based on the wall thickness; S22, calculating a 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 jacketed 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; and calculating the product of the humidity ratio and the humidity to obtain a 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 currents includes: a control module, which, after controlling an excitation coil unit located on the outer surface of a jacketed tube of a tubular reactor to generate an excitation magnetic field, receives a secondary magnetic field generated by induced eddy currents in the tubular reactor through a detection coil unit and generates a corresponding induced voltage signal; an acquisition module, which acquires the wall thickness of the jacketed tube, the induction distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacketed tube and the tubular reactor, calculates a 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; and a detection module, which acquires a nondestructive testing model and performs 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, characterized in that, when the processor executes the computer program, it implements the above-described non-destructive testing method based on resonant pulsed eddy currents.

[0013] A non-transitory computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned non-destructive testing method based on resonant pulsed eddy currents.

[0014] The beneficial effects of this invention are:

[0015] The non-destructive testing method based on resonant pulsed eddy current of the present invention can accurately and effectively perform non-destructive testing on tubular reactors. Attached Figure Description

[0016] Figure 1This is a flowchart of a non-destructive testing method based on resonant pulsed eddy currents according to an embodiment of the present invention;

[0017] Figure 2 This is a block diagram of a non-destructive testing device based on resonant pulsed eddy currents according to an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Figure 1 This is a flowchart of a non-destructive testing method based on resonant pulsed eddy currents according to an embodiment of the present invention.

[0020] It should be noted that the non-destructive testing method of this embodiment is for tubular reactors, which are fitted with a jacketed tube. In other words, the non-destructive testing method of this embodiment is used to perform non-destructive testing on tubular reactors fitted with a jacketed tube.

[0021] like Figure 1 As shown, the nondestructive testing method based on resonant pulsed eddy currents in this embodiment of the invention may include the following steps:

[0022] S1, after the excitation coil unit set on the outer surface of the jacket tube of the tubular reactor generates 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 jacket tube of the tubular reactor. During non-destructive testing of the tubular reactor, the excitation coil unit can be controlled to generate an excitation magnetic field. This induces eddy currents in the tubular reactor, forming 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 larger the induced voltage generated.

[0024] S2, obtain the wall thickness of the jacketed tube, the sensing distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacketed tube and the tubular reactor, calculate the magnetic field shielding value based on the wall thickness, sensing distance and humidity, and correct the induced voltage signal based on the magnetic field shielding value to obtain the detection signal.

[0025] Specifically, in the actual testing 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, thus affecting the accuracy of the test. Therefore, it is necessary to correct the induced voltage signal.

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

[0027] S21, calculate the first magnetic field shielding parameters based on the wall thickness.

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

[0029] The shielding coefficient of the jacketed tube against the magnetic field can be the magnetic field shielding rate of the current jacketed tube material. The magnetic field shielding rate of jacketed tubes of different materials can be obtained in advance through experiments and a shielding coefficient table can be generated. When performing non-destructive testing on the tubular reactor, this shielding coefficient table can be directly called.

[0030] S22, calculate the second magnetic field shielding parameters based on the sensing distance and humidity.

[0031] Specifically, the first distance between the inner wall of the jacketed 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. Then, the product of the humidity ratio and the humidity can be calculated to obtain the second magnetic field shielding parameter.

[0032] S23, calculate the magnetic field shielding value based on 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, can be calculated separately and summed to obtain the magnetic field shielding value. The first and second weights 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] Where k is the adjustment coefficient, P is the magnetic field shielding value, and B d To detect the magnetic field strength of the secondary magnetic field currently received by the coil unit, B j This represents 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 the detection signal.

[0038] S3. Obtain the non-destructive testing model and perform non-destructive testing on the tubular reactor based on the detection signal using the non-destructive testing model.

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

[0040] Then, the detection signals to be trained and the corresponding defect types 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 tubular reactor is subjected to non-destructive testing based on the detection signals using the non-destructive testing model.

[0041] In summary, the non-destructive testing method based on resonant pulsed eddy currents according to embodiments of the present invention, after controlling the excitation coil unit located on the outer surface of the jacket tube of the tubular reactor to generate an excitation magnetic field, receives the secondary magnetic field generated by the induced eddy currents in the tubular reactor through the detection coil unit, and generates a corresponding induced voltage signal. It also acquires 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. The magnetic field shielding value is calculated based on the wall thickness, induction distance, and humidity, and the induced voltage signal is corrected based on the magnetic field shielding value to obtain a detection signal. A non-destructive testing model is then acquired, and the tubular reactor is subjected to non-destructive testing based on the detection signal using the non-destructive testing model. Therefore, non-destructive testing of the tubular reactor can be performed accurately and effectively.

[0042] Corresponding to the non-destructive testing method based on resonant pulsed eddy currents in the above embodiments, the present invention also proposes a non-destructive testing device based on resonant pulsed eddy currents.

[0043] like Figure 2 As shown, the non-destructive testing device based on resonant pulsed eddy current in this embodiment of the invention may include: a control module 100, an acquisition module 200, and a detection module 300.

[0044] The control module 100 controls the excitation coil unit located 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. The acquisition module 200 is used to acquire 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. The module calculates the magnetic field shielding value based on the wall thickness, induction distance, and humidity, and corrects the induced voltage signal based on the magnetic field shielding value to acquire the detection signal. The detection module 300 is used to acquire 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 a first magnetic field shielding parameter based on the wall thickness; calculate a second magnetic field shielding parameter based on the sensing distance and humidity; and calculate a 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 used to: calculate the product of the wall thickness and the shielding coefficient of the jacket tube to the magnetic field, so as to generate a first magnetic field shielding parameter.

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

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

[0049] It should be noted that for details not disclosed in the nondestructive testing equipment based on resonant pulsed eddy currents in the embodiments of the present invention, please refer to the details disclosed in the nondestructive testing method based on resonant pulsed eddy currents described above, which will not be elaborated here.

[0050] According to an embodiment of the present invention, the non-destructive testing equipment based on resonant pulsed eddy currents, after the excitation magnetic field is generated by the excitation coil unit located on the outer surface of the jacket tube of a tubular reactor under the control of the control module, 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 acquires 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. The magnetic field shielding value is calculated based on the wall thickness, induction distance, and humidity, and the induced voltage signal is corrected based on the magnetic field shielding value to obtain a detection signal. The detection module acquires a non-destructive testing model, and the tubular reactor is then subjected to non-destructive testing based on the detection signal using the non-destructive testing model. Therefore, non-destructive testing of the tubular reactor can be performed accurately and effectively.

[0051] Corresponding to the above embodiments, the present invention also proposes a computer device.

[0052] The computer device of this 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, it implements the non-destructive testing method based on resonant pulsed eddy currents described in the above embodiments.

[0053] The computer equipment according to embodiments of the present invention is capable of accurately and effectively performing non-destructive testing on tubular reactors.

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

[0055] The non-transitory computer-readable storage medium of this invention stores a computer program that, when executed by a processor, implements the above-described non-destructive testing method based on resonant pulsed eddy currents.

[0056] The non-transitory computer-readable storage medium according to embodiments of the present invention enables accurate and efficient non-destructive testing of tubular reactors.

[0057] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A nondestructive testing method based on resonant pulsed eddy currents, characterized in that, Includes the following steps: S1, after the excitation coil unit set on the outer surface of the jacket tube of the tubular reactor generates 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. S2, obtain the wall thickness of the jacketed tube, the sensing distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacketed tube and the tubular reactor, calculate the magnetic field shielding value based on the wall thickness, the sensing distance, and the humidity, and correct the induced voltage signal based on the magnetic field shielding value to obtain the detection signal; S3, 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.

2. The nondestructive testing method based on resonant pulsed eddy current according to claim 1, characterized in that, Step S2 specifically includes: S21, Calculate the first magnetic field shielding parameters based on the wall thickness; S22, calculate the second magnetic field shielding parameters based on the sensing distance and the humidity; S23, calculate the magnetic field shielding value based on 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 tube 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: Obtain the first distance between the inner wall of the jacketed tube and the outer wall of the tubular reactor; Calculate the ratio of the first spacing to the sensing spacing to obtain the humidity ratio; Calculate the product of the humidity ratio and the humidity 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: Calculate the products of the first magnetic field shielding parameter and the first weight, and the second magnetic field shielding parameter and the second weight, respectively, and sum them to obtain the magnetic field shielding value.

6. A non-destructive testing device based on resonant pulsed eddy currents, characterized in that, include: The control module is used to receive the secondary magnetic field generated by the induced eddy current in the tubular reactor through the detection coil unit after the excitation coil unit installed on the outer surface of the jacket tube of the tubular reactor generates the excitation magnetic field, and generate the corresponding induced voltage signal. The acquisition module is used to acquire the wall thickness of the jacketed tube, the sensing distance between the detection coil unit and the tubular reactor, and the humidity in the cavity between the jacketed tube and the tubular reactor, and to calculate the magnetic field shielding value based on the wall thickness, the sensing distance and the humidity, and to correct the induced voltage signal based on the magnetic field shielding value to acquire the detection signal. The detection module is used to acquire 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.

7. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements a non-destructive testing method based on resonant pulsed eddy currents according to any one of claims 1-5.

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

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