Method for monitoring blocking rate of oxide skin in austenitic stainless steel tube and related equipment

Abstract

The invention is applicable to the technical field of oxide skin measurement, and provides a method for monitoring the blockage rate of oxide skin in an austenitic stainless steel pipe, and the method comprises the steps: arranging a permanent magnet and a magnet yoke at the periphery of a target austenitic stainless steel pipe according to a preset position, and obtaining a target detection condition; obtaining a target magnetic flux density difference value of the target austenitic stainless steel pipe at different detection points in the target detection area under the target detection condition when the oxide skin content is preset; obtaining a target relation curve based on the target sum value of the target magnetic flux density difference value of each detection point and the preset oxide skin content; performing secondary fitting on the target relation curve to obtain a target calibration formula; obtaining to-be-detected magnetic flux density difference values of the to-be-detected austenitic stainless steel pipe at different detection points in the to-be-detected detection area under the target detection condition, and obtaining the oxide skin blocking rate of the to-be-detected austenitic stainless steel pipe according to the sum value of the to-be-detected magnetic flux density difference values and the target calibration formula.

Description

Technical Field

[0001] The present application belongs to the technical field of oxide scale measurement, and in particular, relates to a method for monitoring the oxide scale blockage rate in an austenitic stainless steel pipe. Background Art

[0002] In the current thermal power plant units, the boiler tubes are mostly made of austenitic stainless steel such as TP347H. This material works in a high-temperature and high-pressure steam environment for a long time, and oxide scale is easy to form inside the tube. During the start-up and shutdown process of the unit, the oxide scale is easy to fall off and accumulate at the bend of the pipe, which will cause local blockage of the pipe and even cause a pipe explosion accident, bringing safety hazards to the unit.

[0003] The prior art method for measuring oxide scale is as follows: a stable constant-strength magnetic field is applied to the outer wall of the austenitic stainless steel pipe to be tested, and a magnetic field sensitive element is used to detect the magnetic field signal generated by the magnetized oxide scale outside the pipe. However, since the main component of the oxide scale is the ferromagnetic object Fe3O4, the oxide scale will be magnetized by the external magnetic field, and at this time, part of the magnetic induction lines will gather toward the oxide scale. When the austenitic stainless steel pipe to be tested has weak ferromagnetism, although the ferromagnetism is relatively weak, part of the magnetic induction lines will gather toward the pipe wall, and the magnetic field distribution will change again. Since part of the magnetic field energy is absorbed by the weak ferromagnetic austenitic stainless steel pipe to be tested, the magnetic induction intensity measured at the detection point will decrease at this time, and the obtained detection signal value may be the signal value of the oxide scale, or it may be the signal value under the combined influence of the oxide scale and the pipe wall, so it is impossible to make a correct judgment on the blockage amount of the oxide scale in its pipe, affecting the accuracy of the oxide scale measurement. Summary of the invention

[0004] The embodiment of the present application provides a method and related equipment for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe, which aims to solve the problem that the blockage amount of oxide scale in the pipe cannot be correctly judged in the prior art, thus affecting the accuracy of oxide scale measurement.

[0005] The present application provides a method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe, comprising the following steps:

[0006] A permanent magnet and a magnetic yoke are arranged at a preset position on the periphery of the target austenitic stainless steel pipe, so that the magnetic lines of force are guided from the magnetic poles of the permanent magnet to an area at a preset distance on the outer surface of the austenitic stainless steel pipe under the action of the magnetic yoke, thereby obtaining target detection conditions;

[0007] Obtaining the target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area under the target detection condition and when the oxide scale content is preset;

[0008] Obtaining a target relationship curve based on a target sum value of a target magnetic flux density difference at each detection point and the preset oxide scale content;

[0009] Performing quadratic fitting on the target relationship curve to obtain a target calibration formula;

[0010] The difference in magnetic flux density to be measured at different detection points in the detection area to be measured of the austenitic stainless steel pipe to be measured under the target detection conditions is obtained, and the scale blockage rate of the austenitic stainless steel pipe to be measured is obtained according to the measured sum of the magnetic flux density difference to be measured and the target calibration formula.

[0011] Optionally, the step of obtaining the target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area under the target detection condition and when the oxide scale content is preset includes:

[0012] Acquire first basic information of the target detection condition, and establish a target finite element model of the target austenitic stainless steel pipe under the target detection condition according to the first basic information and the preset oxide scale content;

[0013] Taking the center of the cross section of the target austenitic stainless steel pipe as the starting point, connecting the starting point and the highest point of the target austenitic stainless steel pipe in the vertical direction to obtain a first starting line, rotating the first starting line by 30° in a clockwise direction to obtain a first boundary of the target detection area, rotating the first starting line by 100° in a clockwise direction to obtain a second boundary of the target detection area, and taking the area within the first boundary and the second boundary as the target detection area;

[0014] The target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area is obtained based on the target finite element model.

[0015] Optionally, the step of obtaining a target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in a target detection area based on the target finite element model includes:

[0016] Obtaining initial magnetic flux density values ​​of the target austenitic stainless steel pipe at different detection points in the target detection area when the preset oxide scale content is zero;

[0017] Obtaining target magnetic flux density values ​​of the target austenitic stainless steel pipe at different detection points in the target detection area when the preset oxide scale content is not zero;

[0018] The target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area is calculated based on the initial magnetic flux density value and the target magnetic flux density value.

[0019] Optionally, the step of obtaining the difference in magnetic flux density at different detection points of the austenitic stainless steel pipe to be tested in the detection area to be tested under the target detection condition comprises:

[0020] Acquire second basic information of the target detection condition, and establish a finite element model of the austenitic stainless steel pipe to be tested under the target detection condition according to the second basic information and the preset oxide scale content;

[0021] Taking the center of the cross section of the austenitic stainless steel pipe to be tested as the starting point, connecting the starting point and the highest point of the austenitic stainless steel pipe to be tested in the vertical direction to obtain a second starting line, rotating the second starting line by 30° in a clockwise direction to obtain a third boundary of the detection area to be tested, rotating the second starting line by 100° in a clockwise direction to obtain a fourth boundary of the detection area to be tested, and taking the area between the third boundary and the fourth boundary as the detection area to be tested;

[0022] The difference in magnetic flux density to be measured at different detection points of the austenitic stainless steel pipe to be measured in the detection area to be measured is obtained based on the finite element model to be measured.

[0023] Optionally, the step of obtaining a target relationship curve based on a target sum value of a target magnetic flux density difference at each detection point and the preset oxide scale content comprises:

[0024] By default formula:

[0025]

[0026] Calculate the target and value of the target magnetic flux density difference of each detection point, wherein the magnetic flux density value of the oxide scale with different blocking area ratios is represented by B(Y), Y represents the blocking area ratio of the oxide scale, and the magnetic flux density values ​​of the oxide scale with different blocking area ratios are B1(Y), ..., Bn(Y), n is the channel number of the different detection points, ΔBn(Y) is the magnetic flux density difference of the detection point when there is oxide scale and when there is no oxide scale in the target austenitic stainless steel pipe, M is the sum of the magnetic flux density differences in the target detection area, and the mathematical representation of ΔBn(Y) is:

[0027] ΔBn(Y)=Bn(0)-Bn(Y)

[0028] A target relationship curve is obtained based on the target sum value of the target magnetic flux density difference at each detection point and the preset oxide scale content.

[0029] Compared with the prior art, the embodiments of the present application have the following beneficial effects: a permanent magnet and a yoke are arranged at a preset position on the periphery of a target austenitic stainless steel pipe, so that the magnetic lines of force are guided from the magnetic poles of the permanent magnet to an area at a preset distance from the outer surface of the austenitic stainless steel pipe under the action of the yoke, thereby obtaining a target detection condition; obtaining a target magnetic flux density difference at different detection points of the target austenitic stainless steel pipe in the target detection area when the oxide scale content is preset under the target detection condition; obtaining a target relationship curve based on a target sum value of the target magnetic flux density difference at each detection point and the preset oxide scale content; performing a quadratic fitting on the target relationship curve to obtain a target calibration formula; obtaining a magnetic flux density difference at different detection points of the austenitic stainless steel pipe to be tested in the detection area to be tested under the target detection condition, and obtaining the oxide scale blockage rate of the austenitic stainless steel pipe to be tested according to the measured sum value of the magnetic flux density difference and the target calibration formula. The magnetic circuit of the existing magnetic detection method is expanded so that the detection magnetic circuit passes through the wall of the austenitic stainless steel pipe as little as possible. At the same time, a considerable length of the magnetic line loop passing through the oxide scale accumulation area and the area that is greatly affected by the accumulated oxide scale is selected as the detection area, thereby reducing the influence of the wall of the austenitic stainless steel pipe on the magnetic line loop and improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a flow chart of a method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe provided by the present invention;

[0032] Figure 2 It is a finite element model diagram of an austenitic stainless steel pipe to be tested in a method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe provided by the present invention;

[0033] Figure 3 This is a simulation result diagram of a far-field static magnetometry method for a non-magnetic tube in a method for monitoring the blockage rate of oxide scale in an austenitic stainless steel tube provided by the present invention;

[0034] Figure 4 It is a simulation result diagram of the far-field static magnetometry method of a weak ferromagnetic tube in a method for monitoring the blockage rate of oxide scale in an austenitic stainless steel tube provided by the present invention;

[0035] Figure 5A method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe provided by the present invention is a relationship diagram between the circumferential angle value and the magnetic flux density value at different measuring points of a weak ferromagnetic pipe;

[0036] Figure 6 It is a relationship diagram between the circumferential angle value and the magnetic flux density value at different measuring points of a non-magnetic tube in a method for monitoring the blockage rate of oxide scale in an austenitic stainless steel tube provided by the present invention;

[0037] Figure 7 The present invention provides a method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe, and shows a relationship between the sum of the magnetic flux density differences and the blockage area ratio of oxide scale. DETAILED DESCRIPTION

[0038] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0039] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0040] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0041] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0042] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0043] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0044] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0045] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0046] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0047] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting" depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]" depending on the context.

[0048] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0049] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0050] like Figure 1 As shown, the embodiment of the present application provides a method for monitoring the oxide scale blockage rate in an austenitic stainless steel pipe, comprising the following steps:

[0051] S101, setting a permanent magnet and a magnetic yoke at a preset position on the periphery of a target austenitic stainless steel pipe, so that the magnetic lines of force are guided from the magnetic poles of the permanent magnet to a region at a preset distance on the outer surface of the austenitic stainless steel pipe under the action of the magnetic yoke, thereby obtaining a target detection condition;

[0052] Exemplarily, the permanent magnet and the yoke are arranged on the periphery of the target austenitic stainless steel tube so that the permanent magnet and the yoke half surround the target austenitic stainless steel tube. For example, the cross-section of the target austenitic stainless steel tube is circular, and the cross-section of the target austenitic stainless steel tube is divided into two symmetrical parts along the vertical direction, and the permanent magnet and the yoke surround either the left or right part.

[0053] S102, obtaining a target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area under target detection conditions and when the oxide scale content is preset;

[0054] In a possible implementation, the step of obtaining the target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area under the target detection condition and when the oxide scale content is preset includes:

[0055] Acquire first basic information of the target detection condition, and establish a target finite element model of the target austenitic stainless steel pipe under the target detection condition according to the first basic information and the preset oxide scale content;

[0056] Taking the center of the cross section of the target austenitic stainless steel pipe as the starting point, connecting the starting point and the highest point of the target austenitic stainless steel pipe in the vertical direction to obtain a first starting line, rotating the first starting line by 30° in a clockwise direction to obtain a first boundary of the target detection area, rotating the first starting line by 100° in a clockwise direction to obtain a second boundary of the target detection area, and taking the area within the first boundary and the second boundary as the target detection area;

[0057] The target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area is obtained based on the target finite element model.

[0058] Exemplarily, under target detection conditions, the magnetic circuit is mainly divided into two types. Since the magnetic field is a static magnetic field, area 1 with a distance less than three times the wall thickness from the detection point is defined as the near field area of ​​the static magnetic field, and area 2 with a distance greater than three times the wall thickness from the detection point is defined as the far field area of ​​the static magnetic field, based on the distance from the magnetic field source. Most of the magnetic circuit in the near field area is a closed magnetic circuit formed by the pipe wall, which is greatly affected by the pipe wall during detection. There is a considerable length of magnetic line loop in the far field area that passes through the oxide scale accumulation area, which is greatly affected by the accumulated oxide scale. The magnetic permeability of the oxide scale is much greater than the magnetic permeability of TP347H austenitic stainless steel that has been in cold processing or served under high temperature and high pressure for a long time. That is, the detection value using the far field area as the detection area is less affected by the weak ferromagnetism of the pipe wall. Comparison Figure 3 and Figure 4 It is found that when the tube wall has weak ferromagnetism, the distribution of magnetic induction lines and the magnetic field intensity in the same detection area do not change substantially. At the same time, the magnetic induction intensity of each detection point in the detection area (arc length area) of the far field area is related to the amount of oxide scale accumulation. By selecting several detection points in the far field area, the degree of accumulation of oxide scale in the tube can be reflected by measuring the magnetic induction intensity of these points. Therefore, the center of the cross section of the target austenitic stainless steel tube is selected as the starting point, and the starting point is connected with the highest point of the target austenitic stainless steel tube in the vertical direction to obtain the first starting line, and the first starting line is rotated 30° in a clockwise direction to obtain the first boundary of the target detection area, and the first starting line is rotated 100° in a clockwise direction to obtain the second boundary of the target detection area, and the area within the first boundary and the second boundary is used as the target detection area.

[0059] For example, Figure 2As shown, a target finite element model of the target austenitic stainless steel pipe under the target detection condition is established according to the first basic information and the preset oxide scale content, wherein the first basic information includes but is not limited to: component information, parameter information of each component and setting information; component information, for example, component name, i.e., austenitic stainless steel pipe, permanent magnet, yoke, oxide scale and air; parameter information of each component, for example, the outer diameter of the target austenitic stainless steel pipe is 45 mm, the wall thickness of the target austenitic stainless steel pipe is 9 mm, and setting information, for example, the center of the cross-section circle of the target austenitic stainless steel pipe is the center of the air domain.

[0060] S103, obtaining a target relationship curve based on the target sum value of the target magnetic flux density difference of each detection point and the preset oxide scale content;

[0061] In a possible implementation, the step of obtaining a target relationship curve based on the target sum value of the target magnetic flux density difference at each detection point and the preset oxide scale content includes:

[0062] By default formula:

[0063]

[0064] Calculate the target and value of the target magnetic flux density difference of each detection point, wherein the magnetic flux density value of the oxide scale with different blocking area ratios is represented by B(Y), Y represents the blocking area ratio of the oxide scale, and the magnetic flux density values ​​of the oxide scale with different blocking area ratios are B1(Y), ..., Bn(Y), n is the channel number of the different detection points, ΔBn(Y) is the magnetic flux density difference of the detection point when there is oxide scale and when there is no oxide scale in the target austenitic stainless steel pipe, M is the sum of the magnetic flux density differences in the target detection area, and the mathematical representation of ΔBn(Y) is:

[0065] ΔBn(Y)=Bn(0)-Bn(Y)

[0066] A target relationship curve is obtained based on the target sum value of the target magnetic flux density difference at each detection point and the preset oxide scale content.

[0067] For example, simulations are performed on non-magnetic stainless steel pipes and weakly ferromagnetic stainless steel pipes with oxide scale blockage area ratios of 0%, 10%, 20%, 30%, ..., 50%, respectively, and the following results are obtained: Figure 5 The relationship between the circumferential angle value and the magnetic flux density value at different measuring points of the weak ferromagnetic tube and the Figure 6 The relationship between the circumferential angle value and the magnetic flux density value at different measuring points of the non-magnetic tube is compared. Figure 5 and Figure 6It can be seen that with the increase of the circular angle, the magnetic flux density values ​​of the oxide scales with different blockage area ratios all show a pattern of first decreasing and then increasing, and the curve pattern when the tube to be detected is non-magnetic is basically consistent with that when the tube to be detected has weak ferromagnetism, indicating that the magnetic flux density value in the detection area is not affected by the weak ferromagnetism of the tube to be detected, that is, the comprehensive influence of the magnetic flux density difference in the detection area can better explain the changes in the magnetic field in the detection area caused by the oxide scales with different blockage area ratios. In other words, the sum of the magnetic flux density differences in the detection area is more suitable for characterizing the blockage area ratio of the oxide scale.

[0068] S104, performing a quadratic fit on the target relationship curve to obtain a target calibration formula;

[0069] Exemplarily, a quadratic fit is performed on the target relationship curve to obtain Figure 7 The fitting curve diagram shown in FIG. 1 is used to obtain the target calibration formula, and the mathematical representation of the target calibration formula is as follows:

[0070] Y=-39.3M 2 +156.9M+0.06.

[0071] S105, obtaining the difference in magnetic flux density at different detection points of the austenitic stainless steel pipe to be tested in the test area to be tested under the target detection condition, and obtaining the scale blockage rate of the austenitic stainless steel pipe to be tested according to the measured sum of the magnetic flux density difference and the target calibration formula.

[0072] A permanent magnet and a yoke are arranged at a preset position on the periphery of a target austenitic stainless steel pipe, so that the magnetic lines of force are guided from the magnetic poles of the permanent magnet to an area at a preset distance on the outer surface of the austenitic stainless steel pipe under the action of the yoke, thereby obtaining a target detection condition; obtaining a target magnetic flux density difference at different detection points of the target austenitic stainless steel pipe in a target detection area when the oxide scale content is preset under the target detection condition; obtaining a target relationship curve based on a target sum value of the target magnetic flux density difference at each detection point and the preset oxide scale content; performing a quadratic fitting on the target relationship curve to obtain a target calibration formula; obtaining a magnetic flux density difference at different detection points of the austenitic stainless steel pipe to be tested in the detection area to be tested under the target detection condition, and obtaining an oxide scale blockage rate of the austenitic stainless steel pipe to be tested according to the measured sum value of the magnetic flux density difference and the target calibration formula. The magnetic circuit of the existing magnetic detection method is expanded so that the detection magnetic circuit passes through the wall of the austenitic stainless steel pipe as little as possible. At the same time, a considerable length of the magnetic line loop passing through the oxide scale accumulation area and the area that is greatly affected by the accumulated oxide scale is selected as the detection area, thereby reducing the influence of the wall of the austenitic stainless steel pipe on the magnetic line loop and improving the detection accuracy.

[0073] In a possible implementation, the step of obtaining a target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in a target detection area based on the target finite element model includes:

[0074] Obtaining initial magnetic flux density values ​​of the target austenitic stainless steel pipe at different detection points in the target detection area when the preset oxide scale content is zero;

[0075] Obtaining target magnetic flux density values ​​of the target austenitic stainless steel pipe at different detection points in the target detection area when the preset oxide scale content is not zero;

[0076] The target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area is calculated based on the initial magnetic flux density value and the target magnetic flux density value.

[0077] In a possible implementation, the step of obtaining the difference in magnetic flux density at different detection points of the austenitic stainless steel pipe to be tested within the detection area to be tested under the target detection condition includes:

[0078] Acquire second basic information of the target detection condition, and establish a finite element model of the austenitic stainless steel pipe to be tested under the target detection condition according to the second basic information and the preset oxide scale content;

[0079] Taking the center of the cross section of the austenitic stainless steel pipe to be tested as the starting point, connecting the starting point and the highest point of the austenitic stainless steel pipe to be tested in the vertical direction to obtain a second starting line, rotating the second starting line by 30° in a clockwise direction to obtain a third boundary of the detection area to be tested, rotating the second starting line by 100° in a clockwise direction to obtain a fourth boundary of the detection area to be tested, and taking the area between the third boundary and the fourth boundary as the detection area to be tested;

[0080] The difference in magnetic flux density to be measured at different detection points of the austenitic stainless steel pipe to be measured in the detection area to be measured is obtained based on the finite element model to be measured.

[0081] In a second aspect, the present application provides a device for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe, the device comprising:

[0082] A preset module is used to set a permanent magnet and a magnetic yoke at a preset position on the periphery of a target austenitic stainless steel pipe, so that the magnetic lines of force are guided from the magnetic poles of the permanent magnet to a region at a preset distance on the outer surface of the austenitic stainless steel pipe under the action of the magnetic yoke, thereby obtaining a target detection condition;

[0083] A data acquisition module, used to obtain the target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area under the target detection condition and when the oxide scale content is preset;

[0084] A calculation module, configured to obtain a target relationship curve based on a target sum of target magnetic flux density differences at each detection point and the preset oxide scale content;

[0085] A fitting module, used for performing a quadratic fitting on the target relationship curve to obtain a target calibration formula;

[0086] The detection module is used to obtain the difference in magnetic flux density to be measured at different detection points in the detection area to be measured for the austenitic stainless steel pipe to be tested under the target detection conditions, and obtain the scale blockage rate of the austenitic stainless steel pipe to be tested based on the measured sum of the magnetic flux density difference to be measured and the target calibration formula.

[0087] In a third aspect, an embodiment of the present application provides an electronic device, comprising a memory, a processor 320, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program: a permanent magnet and a yoke are arranged at a preset position on the periphery of a target austenitic stainless steel pipe, so that the magnetic lines of force are guided from the magnetic poles of the permanent magnet to an area at a preset distance from the outer surface of the austenitic stainless steel pipe under the action of the yoke, thereby obtaining a target detection condition; obtaining a target magnetic flux density difference at different detection points of the target austenitic stainless steel pipe in the target detection area when the oxide scale content is preset under the target detection condition; obtaining a target relationship curve based on a target sum value of the target magnetic flux density difference at each detection point and the preset oxide scale content; performing quadratic fitting on the target relationship curve to obtain a target calibration formula; obtaining a magnetic flux density difference at different detection points of the austenitic stainless steel pipe to be tested in the detection area to be tested under the target detection condition, and obtaining the oxide scale blockage rate of the austenitic stainless steel pipe to be tested according to the measured sum value of the magnetic flux density difference and the target calibration formula.

[0088] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented: a permanent magnet and a yoke are arranged at a preset position on the periphery of a target austenitic stainless steel pipe, so that the magnetic lines of force are guided from the magnetic poles of the permanent magnet to an area at a preset distance from the outer surface of the austenitic stainless steel pipe under the action of the yoke, thereby obtaining a target detection condition; obtaining a target magnetic flux density difference at different detection points of the target austenitic stainless steel pipe in the target detection area when the oxide scale content is preset under the target detection condition; obtaining a target relationship curve based on a target sum value of the target magnetic flux density difference at each detection point and the preset oxide scale content; performing quadratic fitting on the target relationship curve to obtain a target calibration formula; obtaining a magnetic flux density difference at different detection points of the austenitic stainless steel pipe to be tested in the detection area to be tested under the target detection condition, and obtaining the oxide scale blockage rate of the austenitic stainless steel pipe to be tested according to the measured sum value of the magnetic flux density difference and the target calibration formula.

[0089] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium can at least include: any entity or device that can carry the computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0090] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0091] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0092] In the embodiments provided in the present application, it should be understood that the disclosed devices / network equipment / terminal equipment and methods can be implemented in other ways. For example, the device / network equipment / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0093] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0094] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe, characterized in that: The method comprises: A permanent magnet and a magnetic yoke are arranged at a preset position on the periphery of the target austenitic stainless steel pipe, so that the magnetic lines of force are guided from the magnetic poles of the permanent magnet to an area at a preset distance on the outer surface of the austenitic stainless steel pipe under the action of the magnetic yoke, thereby obtaining target detection conditions; Obtaining the target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area under the target detection condition and when the oxide scale content is preset; Obtaining a target relationship curve based on a target sum value of a target magnetic flux density difference at each detection point and the preset oxide scale content; Performing quadratic fitting on the target relationship curve to obtain a target calibration formula; The difference in magnetic flux density to be measured at different detection points in the detection area to be measured of the austenitic stainless steel pipe to be measured under the target detection conditions is obtained, and the scale blockage rate of the austenitic stainless steel pipe to be measured is obtained according to the measured sum of the magnetic flux density difference to be measured and the target calibration formula.

2. The method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe according to claim 1, characterized in that: The step of obtaining the target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area under the target detection condition and when the oxide scale content is preset comprises: Acquire first basic information of the target detection condition, and establish a target finite element model of the target austenitic stainless steel pipe under the target detection condition according to the first basic information and the preset oxide scale content; Taking the center of the cross section of the target austenitic stainless steel pipe as the starting point, connecting the starting point and the highest point of the target austenitic stainless steel pipe in the vertical direction to obtain a first starting line, rotating the first starting line by 30° in a clockwise direction to obtain a first boundary of the target detection area, rotating the first starting line by 100° in a clockwise direction to obtain a second boundary of the target detection area, and taking the area within the first boundary and the second boundary as the target detection area; The target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area is obtained based on the target finite element model.

3. A method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe as claimed in claim 2, characterized in that: The step of obtaining the target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area based on the target finite element model includes: Obtaining initial magnetic flux density values ​​of the target austenitic stainless steel pipe at different detection points in the target detection area when the preset oxide scale content is zero; Obtaining target magnetic flux density values ​​of the target austenitic stainless steel pipe at different detection points in the target detection area when the preset oxide scale content is not zero; The target magnetic flux density difference of the target austenitic stainless steel pipe at different detection points in the target detection area is calculated based on the initial magnetic flux density value and the target magnetic flux density value.

4. The method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe according to claim 1, characterized in that: The step of obtaining the difference in magnetic flux density at different detection points of the austenitic stainless steel pipe to be tested within the detection area to be tested under the target detection condition comprises: Acquire second basic information of the target detection condition, and establish a finite element model of the austenitic stainless steel pipe to be tested under the target detection condition according to the second basic information and the preset oxide scale content; Taking the center of the cross section of the austenitic stainless steel pipe to be tested as the starting point, connecting the starting point and the highest point of the austenitic stainless steel pipe to be tested in the vertical direction to obtain a second starting line, rotating the second starting line by 30° in a clockwise direction to obtain a third boundary of the detection area to be tested, rotating the second starting line by 100° in a clockwise direction to obtain a fourth boundary of the detection area to be tested, and taking the area between the third boundary and the fourth boundary as the detection area to be tested; The difference in magnetic flux density to be measured at different detection points of the austenitic stainless steel pipe to be measured in the detection area to be measured is obtained based on the finite element model to be measured.

5. The method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe according to claim 1, characterized in that: The step of obtaining a target relationship curve based on the target sum value of the target magnetic flux density difference at each detection point and the preset oxide scale content comprises: By default formula: Calculate the target and value of the target magnetic flux density difference of each detection point, wherein the magnetic flux density value of the oxide scale with different blocking area ratios is represented by B(Y), Y represents the blocking area ratio of the oxide scale, and the magnetic flux density values ​​of the oxide scale with different blocking area ratios are B1(Y), ..., Bn(Y), n is the channel number of the different detection points, ΔBn(Y) is the magnetic flux density difference of the detection point when there is oxide scale and when there is no oxide scale in the target austenitic stainless steel pipe, M is the sum of the magnetic flux density differences in the target detection area, and the mathematical representation of ΔBn(Y) is: ΔBn(Y)=Bn(0)-Bn(Y) A target relationship curve is obtained based on the target sum value of the target magnetic flux density difference at each detection point and the preset oxide scale content.

6. An electronic device, characterized in that: The method comprises 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 method for monitoring the blockage rate of oxide scale in an austenitic stainless steel pipe according to any one of claims 1 to 6 is implemented.

Images