Pipeline non-uniform corrosion monitoring method and device, electronic equipment and medium

Abstract

The invention relates to a pipeline non-uniform corrosion monitoring method, a pipeline non-uniform corrosion monitoring device, electronic equipment and a medium, and belongs to the technical field of intelligent monitoring. The first radius of the pipeline before corrosion, the first arc length of the local unit of the pipeline before corrosion, the second arc length of the local unit of the pipeline before corrosion, and the third radius of the rust layer of the local unit of the pipeline after corrosion; according to the radian, the first arc length, the second arc length, the first radius, the second radius and the third radius, determining the first pipeline loss total mass of the pipeline local unit, then obtaining a second relation between the sensing optical fiber phase change caused by corrosion and the optical fiber strain rate, and according to the first pipeline loss total mass and the second relation, determining the second pipeline loss total mass. And monitoring the non-uniform corrosion of the pipeline according to the second pipeline loss total mass. The method can be used for quantitatively detecting the non-uniform corrosion condition of the pipeline.

Description

Technical Field

[0001] This invention relates to the field of intelligent monitoring technology, and in particular to a method, device, electronic equipment, and medium for monitoring non-uniform corrosion of pipelines. Background Technology

[0002] Pipelines, as key facilities for transporting oil, natural gas, chemicals, and clean energy, have many advantages such as low cost, linearity, large transport capacity, immunity to weather conditions, and continuous operation, earning them the title of "civilized transportation" among the five major transportation industries. However, during operation, pipelines are susceptible to complex environmental factors (such as soil corrosion, chemical reactions of the medium, and stray currents) that can cause non-uniform corrosion, leading to localized thinning of the pipe body and seriously threatening the safe operation and structural integrity of the pipeline.

[0003] In recent years, distributed fiber optic sensor technology has been increasingly applied to pipeline corrosion monitoring due to its advantages such as long-distance operation, full coverage, and electromagnetic interference resistance. Pipeline safety monitoring based on distributed fiber optic sensor technology has become a research hotspot in recent years. For example, patent CN 119804495 A proposes a method for detecting the corrosion status of metal pipelines based on tilted fiber gratings. By deploying tilted fiber gratings on the outer wall of the pipeline, real-time monitoring is achieved by utilizing the spectral changes caused by the penetration of corrosive media. However, this method relies on local refractive index changes, making it difficult to directly quantify the overall corrosion mass loss. Its sensitivity is greatly affected by the grating manufacturing precision and environmental noise, and its ability to characterize non-uniform corrosion morphology and corrosion process is limited. Patent CN115493089B discloses a non-invasive, online monitoring method for corrosion of rigid pipelines, which obtains pipeline expansion strain and quantifies corrosion status through spiral fiber optic deployment. However, this method mainly targets uniform corrosion scenarios, does not fully consider non-uniform corrosion caused by the accumulation or loss of corrosion products, and has limited ability to distinguish noise and predict corrosion levels in complex environments. Patent CN201911117382.5 discloses a corrosion monitoring method for oil and gas pipelines based on OFDR, which detects pipeline corrosion by monitoring circumferential strain through sensing optical fibers. However, corrosion monitoring methods based on circumferential strain suffer from low sensitivity and sensitivity to pipeline pressure fluctuations. Furthermore, they require tight coupling between the optical fiber and the pipe wall, posing significant challenges to installation and making it difficult to diagnose early-stage, small-scale pipeline corrosion. Patent CN106764463A discloses an online monitoring device and method for pipeline leakage and corrosion based on fiber optic grating sensing. While this system has a simple structure, systems based on Brillouin scattering technology are typically complex, costly, and difficult to effectively suppress false alarms caused by external interference.

[0004] In summary, the existing technology lacks a method for quantitative analysis of the quality reduction caused by non-uniform corrosion in pipelines. Summary of the Invention

[0005] In view of this, it is necessary to provide a method, device, electronic equipment and medium for monitoring non-uniform corrosion of pipelines, so as to solve the problem that non-uniform corrosion of pipelines cannot be quantitatively monitored in the prior art.

[0006] To address the aforementioned problems, in a first aspect, the present invention provides a method for monitoring non-uniform corrosion in pipelines, comprising: The arc corresponding to the local unit of the pipeline is obtained, the first radius of the pipeline before corrosion, the first arc length of the local unit of the pipeline before corrosion, the second arc length of the local unit of the pipeline before corrosion, and the third radius of the local unit of the pipeline with rust after corrosion. The fiber optic sensor is laid on the pipeline in a spiral pattern, and the cross section of the pipeline is divided into multiple local units of the pipeline according to a preset angle. The volume of steel consumed by the local unit of the pipeline and the volume of corrosion products accumulated under the corrosion of the local unit of the pipeline are obtained, and the first mass reduction of the local unit of the pipeline caused by corrosion is obtained based on the volume of steel. The first relationship between the third radius and the first radius is determined based on the strain change caused by the expansion of corrosion products in local pipeline units. The strain change is obtained based on the first arc length and the second arc length. The second mass reduction is determined based on radianity, volume expansion coefficient, strain change, first relationship, and first mass reduction. The volume expansion coefficient is obtained based on the steel volume and corrosion product volume. The total mass loss of the first pipeline is determined based on the second mass reduction amount; To obtain a second relationship between corrosion-induced phase change in the sensing fiber and fiber strain rate; The second total pipeline loss is obtained based on the second relationship and the first total pipeline loss, and the non-uniform corrosion of the pipeline is monitored based on the second total pipeline loss.

[0007] In one possible implementation, obtaining the volume of steel consumed by a local pipe unit and the volume of corrosion products accumulated under the corrosion of the local pipe unit includes: The volume of steel consumed by the local pipe unit is obtained based on the arc, the first radius, and the second radius of the rust-free layer of the local pipe unit after corrosion. The corrosion products accumulated under the local unit corrosion of the pipeline are obtained based on the arc, the second radius, and the third radius.

[0008] In one possible implementation, the fiber optic sensors are laid on the pipe in a spiral, equidistant arrangement.

[0009] In one possible implementation, the formula for the strain change is:

[0010] The formula for the volume expansion coefficient is:

[0011] The expression for the first formula is:

[0012] In the formula, ε i j This represents the strain at the i-th measurement point on the j-th layer of the optical fiber. Indicates the length of the first arc. Indicates the length of the second arc. Indicates the first radius, R represents the third radius. w V represents the second radius, Vp represents the volume of steel consumed by a local unit of the pipe, and V r This indicates the volume of corrosion products accumulated under the influence of corrosion in a localized section of the pipeline.

[0013] In one possible implementation, the circumference of the pipe is greater than the distance between two adjacent scattering enhancement points in the fiber optic sensor.

[0014] In one possible implementation, the expression for the total mass loss of the second pipeline is:

[0015] In the formula, Indicates the number of layers in the fiber optic sensor. This represents the strain test points on each of the m layers. This represents the length of the first arc, and ρ is the density of the steel in the pipe. Indicates the strain coefficient. , Indicates the length of the first arc. Indicates the first radius, Indicates the coefficient of volume expansion. This represents the phase difference between the a-th and b-th scattering enhancement points.

[0016] In one possible implementation, monitoring of non-uniform corrosion of the pipeline is based on the total mass loss of the second pipeline, including: If the mass reduction obtained by the adjacent sensing unit in the total mass loss of the second pipeline is not within the pipeline mass reduction threshold, then it is determined that there is a non-uniform corrosion state on the pipeline.

[0017] Secondly, the present invention also provides a pipeline non-uniform corrosion monitoring device, comprising: The data acquisition module is used to acquire the arc corresponding to the local unit of the pipeline, the first radius of the pipeline before corrosion, the first arc length of the local unit of the pipeline before corrosion, the second arc length of the local unit of the pipeline before corrosion, and the third radius of the local unit of the pipeline with rust after corrosion. The fiber optic sensor is laid on the pipeline in a spiral pattern, and the cross section of the pipeline is divided into multiple local units of the pipeline according to a preset angle. The first mass reduction acquisition module is used to acquire the volume of steel consumed by the local unit of the pipeline and the volume of corrosion products accumulated under the corrosion of the local unit of the pipeline, and to obtain the first mass reduction of the local unit of the pipeline caused by corrosion based on the volume of steel. The first relationship acquisition module is used to determine the first relationship between the third radius and the first radius based on the strain change caused by the expansion of corrosion products in local pipe units. The strain change is obtained based on the first arc length and the second arc length. The second mass reduction determination module is used to determine the second mass reduction based on radian, volume expansion coefficient, strain change, first relationship and first mass reduction, where the volume expansion coefficient is obtained based on the steel volume and corrosion product volume. The first pipeline loss total mass determination module is used to determine the first pipeline loss total mass based on the second mass reduction amount; The second relationship determination module is used to obtain the second relationship between the phase change of the sensing fiber induced by corrosion and the fiber strain rate. The monitoring module is used to obtain the second total pipeline loss based on the second relationship and the first total pipeline loss, and to monitor the non-uniform corrosion of the pipeline based on the second total pipeline loss.

[0018] Thirdly, the present invention also provides an electronic device, including a memory and a processor, wherein, The memory is used to store programs; The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps in the pipeline non-uniform corrosion monitoring method described in any of the above implementations.

[0019] Fourthly, the present invention also provides a computer-readable storage medium for storing a computer-readable program or instructions, which, when executed by a processor, can implement the steps of the pipeline non-uniform corrosion monitoring method described in any of the above implementations.

[0020] The beneficial effects of this invention are as follows: This invention provides a method for monitoring non-uniform corrosion of pipelines, comprising: acquiring the arc corresponding to a local unit of the pipeline, the first radius of the pipeline before corrosion, the first arc length of the local unit of the pipeline before corrosion, the second arc length of the local unit of the pipeline before corrosion, and the third radius of the local unit of the pipeline with rust layer after corrosion; fiber optic sensors are laid on the pipeline in a spiral arrangement; multiple local units of the pipeline are obtained by dividing the cross section of the pipeline according to a preset angle; by dividing the pipeline by the preset angle, each local unit of the pipeline is used to characterize the non-uniform corrosion of the pipeline; compared with the uniform corrosion in the prior art, this technical solution can measure the non-uniform corrosion of the pipeline and lay the foundation for calculating the mass loss of the local unit of the pipeline. This invention obtains the volume of steel consumed by a local pipeline unit and the volume of corrosion products accumulated under the corrosion of that unit. Based on the steel volume, it calculates the first mass reduction caused by corrosion in the local pipeline unit. Based on the strain change caused by the expansion of corrosion products, it determines a first relationship between the third radius and the first radius. The strain change is based on the first and second arc lengths. Based on the radian, volume expansion coefficient, strain change, the first relationship, and the first mass reduction, it determines a second mass reduction. The volume expansion coefficient is based on the steel volume and the corrosion product volume. The first total pipeline loss is determined based on the second mass reduction. A second relationship is obtained between the phase change of the sensing fiber optic cable induced by corrosion and the fiber strain rate. Based on the second relationship and the first total pipeline loss, the second total pipeline loss is obtained. Therefore, the mass reduction due to non-uniform corrosion of the local pipeline unit can be calculated using the acoustic field phase information of the fiber optic sensor. The non-uniform corrosion of the pipeline is then monitored based on the second total pipeline loss. This invention divides the pipeline cross-section into several radians, thereby enabling the calculation of the mass loss due to non-uniform corrosion and establishing a relationship between acoustic field phase information and the mass loss, thus quantitatively detecting the condition of non-uniform pipeline corrosion. Attached Figure Description

[0021] Figure 1 This is a flowchart of an embodiment of a pipeline non-uniform corrosion monitoring method provided by the present invention; Figure 2 A diagram of a pipeline non-uniform corrosion monitoring device provided for the implementation of this invention; Figure 3 This is a schematic diagram of a local unit corrosion profile model of a pipeline in a pipeline non-uniform corrosion monitoring method. Figure 4 This is a front view of pipeline non-uniform corrosion detection in a pipeline non-uniform corrosion monitoring method. Figure 5 This is a schematic flowchart of an embodiment of a pipeline non-uniform corrosion monitoring device provided by the present invention; Figure 6A schematic diagram of an embodiment of the electronic device provided by the present invention. Detailed Implementation

[0022] 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 a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0024] The terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a technical feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] Before demonstrating the embodiments, the following terms will be explained.

[0027] This invention provides a method, device, electronic equipment, and medium for monitoring non-uniform corrosion in pipelines, which will be described below.

[0028] Figure 1 This is a schematic flowchart of an embodiment of the pipeline non-uniform corrosion monitoring method provided by the present invention, as shown below. Figure 1 As shown, the method for monitoring non-uniform corrosion in pipelines includes: S101. Obtain the radian corresponding to the local unit of the pipeline, the first radius of the pipeline before corrosion, the first arc length of the local unit of the pipeline before corrosion, the second arc length of the local unit of the pipeline before corrosion, and the third radius of the local unit of the pipeline with rust after corrosion. The fiber optic sensor is laid on the pipeline in a spiral pattern. Multiple local units of the pipeline are divided into sections according to a preset angle. S102. Obtain the volume of steel consumed by the local unit of the pipeline and the volume of corrosion products accumulated under the corrosion of the local unit of the pipeline, and obtain the first mass reduction of the local unit of the pipeline caused by corrosion based on the volume of steel. S103. Determine the first relationship between the third radius and the first radius based on the strain change caused by the expansion of corrosion products in local pipeline units. The strain change is obtained based on the first arc length and the second arc length. S104. Determine the second mass reduction based on radianity, volume expansion coefficient, strain change, first relationship, and first mass reduction. The volume expansion coefficient is obtained based on the steel volume and corrosion product volume. S105. Determine the total mass loss of the first pipeline based on the second mass reduction amount; S106. Obtain the second relationship between the phase change of the sensing fiber induced by corrosion and the fiber strain rate; S107. Based on the second relationship and the first total pipeline loss mass, the second total pipeline loss mass is obtained, and the non-uniform corrosion of the pipeline is monitored according to the second total pipeline loss mass.

[0029] Compared with the prior art, this embodiment provides a method for monitoring non-uniform corrosion of pipelines, including: obtaining the arc corresponding to a local unit of the pipeline, the first radius of the pipeline before corrosion, the first arc length of the local unit of the pipeline before corrosion, the second arc length of the local unit of the pipeline before corrosion, and the third radius of the local unit of the pipeline with rust layer after corrosion; fiber optic sensors are laid on the pipeline in a spiral arrangement; multiple local units of the pipeline are obtained by dividing the cross section of the pipeline according to a preset angle; by dividing the pipeline by the preset angle, each local unit of the pipeline is used to characterize the non-uniform corrosion of the pipeline. Compared with the uniform corrosion in the prior art, this technical solution can measure the non-uniform corrosion of the pipeline and lay the foundation for calculating the mass loss of the local unit of the pipeline. This invention obtains the volume of steel consumed by a local pipeline unit and the volume of corrosion products accumulated under the corrosion of that unit. Based on the steel volume, it calculates the first mass reduction caused by corrosion in the local pipeline unit. Based on the strain change caused by the expansion of corrosion products, it determines a first relationship between the third radius and the first radius. The strain change is based on the first and second arc lengths. Based on the radian, volume expansion coefficient, strain change, the first relationship, and the first mass reduction, it determines a second mass reduction. The volume expansion coefficient is based on the steel volume and the corrosion product volume. The first total pipeline loss is determined based on the second mass reduction. A second relationship is obtained between the phase change of the sensing fiber optic cable induced by corrosion and the fiber strain rate. Based on the second relationship and the first total pipeline loss, the second total pipeline loss is obtained. Therefore, the mass reduction due to non-uniform corrosion of the local pipeline unit can be calculated using the acoustic field phase information of the optical fiber sensor. The non-uniform corrosion of the pipeline is then monitored based on the second total pipeline loss. This invention divides the pipeline cross-section into several radians, thereby enabling the calculation of the mass loss due to non-uniform corrosion and establishing a relationship between acoustic field phase information and the mass loss, thus quantitatively detecting the condition of non-uniform pipeline corrosion.

[0030] It should be noted that before introducing the method of this invention, it is necessary to introduce the corresponding hardware device, specifically as follows: Figure 2 As shown, the hardware device comprises a fiber optic acoustic wave sensing system 1, a pipeline non-uniform corrosion monitoring system 2, and a discrete non-uniform corrosion sensing unit 3 laid on the pipeline. The fiber optic acoustic wave sensing system 1 is used to incident the probe light output from the pulsed laser onto the discrete non-uniform corrosion sensing unit 3, and to detect the backscattered light returning from the discrete non-uniform corrosion sensing unit 3; the discrete non-uniform corrosion sensing unit 3 is composed of a scattering-enhancing optical fiber spirally wound on the pipeline. The scattering-enhancing optical fiber is a periodic backscattering enhancement unit formed in the core material by ultraviolet light writing technology. The discrete non-uniform corrosion sensing unit 3 includes multiple fiber optic sensor units, whose thread spacing is dynamically adjustable according to the monitoring accuracy of pipeline non-uniform corrosion. The fiber optic thread spacing between each discrete non-uniform corrosion sensing unit 3 is the same, which facilitates formula measurement and calculation, and also facilitates accurate positioning of pipeline non-uniform corrosion location.

[0031] During operation, the hardware device detects and transmits various signals, including flow-induced noise generated by the bidirectional coupling between the fluid and the pipe wall, acoustic emission signals generated by localized non-uniform corrosion, and the expansion and stretching of local pipe cross-section diameters caused by non-uniform corrosion. These signals are all precisely sensed by the discrete non-uniform corrosion sensing unit 3 and transmitted back to the fiber optic acoustic wave sensing system 1. The fiber optic acoustic wave sensing system 1 then demodulates the phase information at each discrete non-uniform corrosion sensing unit in real time. Generate sound field phase information along the pipeline, where , , ... These represent the phase information of the 1st, 2nd, 3rd...nth discretized non-uniform corrosion sensing units on the pipeline, respectively. Finally, the acoustic field phase information is input into the pipeline non-uniform corrosion monitoring system 2 to calculate the reduction in mass of each local unit of the pipeline.

[0032] In some embodiments of the present invention, obtaining the volume of steel consumed by a local pipeline unit and the volume of corrosion products accumulated under the corrosion of the local pipeline unit includes: The volume of steel consumed by the local pipe unit is obtained based on the arc, the first radius, and the second radius of the rust-free layer of the local pipe unit after corrosion. The corrosion products accumulated under the local unit corrosion of the pipeline are obtained based on the arc, the second radius, and the third radius.

[0033] In some embodiments of the present invention, the fiber optic sensor is laid on the pipe in a spiral, equidistant arrangement.

[0034] In some embodiments of the present invention, the fiber optic sensor is laid on the pipe in a spiral, equidistant arrangement.

[0035] In some embodiments of the present invention, the circumference of the pipe is greater than the distance between two adjacent scattering enhancement points in the fiber optic sensor.

[0036] It should be noted that, as Figure 3 As shown, the cross-section of the pipe is divided into multiple local pipe units according to a preset angle. For example, if α=30 degrees, then 360 degrees / 30 degrees=12, which means the cross-section of the pipe is divided into 12 local pipe units.

[0037] In a specific embodiment of the present invention, the arc length corresponding to the local unit of the pipe is α, which is determined by the pipe radius and the arc length of the local unit: (1) Where R0 represents the radius of the pipe before corrosion, and L1 represents the arc length of a local unit of the pipe before corrosion, which is determined by the sampling resolution of the fiber optic acoustic wave sensing system.

[0038] When corrosion occurs in a pipeline, the volume of steel consumed at a single local unit of the pipeline, V p It can be represented as: (2) Where h represents the fiber thread pitch, R w This represents the radius of the rust-free local unit of the pipeline after corrosion.

[0039] The corrosion product Vr accumulated at a local unit of a single pipe can be expressed as: (3) Where Rc represents the radius of the rust layer in a local unit of the pipeline after corrosion.

[0040] The mass reduction caused by corrosion in a single local unit of a pipeline can be expressed as: (4) Among them, V p The value of ρ represents the amount of steel consumed in the pipeline due to corrosion when Rc is greater than R0, where ρ is the density of the pipeline material, and Δm is the value of Δm. j i This represents the mass reduction of the i-th local unit at the j-th layer of the optical fiber in the pipeline.

[0041] In some embodiments of the present invention, corrosion causes the pipe radius to increase from R0 to R c The strain change ε j i The formula is: (5) The expression for the first formula is: (6) The formula for the volume expansion coefficient is: (7) In the formula, ε i j This represents the strain at the i-th measurement point on the j-th layer of the optical fiber. Indicates the length of the first arc. Indicates the length of the second arc. Indicates the first radius, R represents the third radius. wV represents the second radius, Vp represents the volume of steel consumed by a local unit of the pipe, and V r This indicates the volume of corrosion products accumulated under the influence of corrosion in a localized section of the pipeline.

[0042] Substituting equations (1), (5)-(7) into equation (4), the mass reduction of a single local pipe unit can be expressed as: (8) like Figure 4 As shown, the sensing optical fiber is laid in a spiral pattern on the pipe. There are m layers of optical fiber on the pipe, and each layer has n strain measurement points. Therefore, the total mass loss of the pipe Δm is expressed as: (9) On the sensing fiber optic cable a and the b The optical phase difference between the scattering enhancement points can be expressed as: (10) in , The first a , b The optical phase corresponding to each scattering enhancement point, here 1 <a<b<n,n e d is the effective refractive index of the sensing fiber. ab The distance between the two scattering enhancement points is denoted by λ, and λ represents the wavelength of the light injected into the fiber.

[0043] The phase difference between the a-th and b-th scattering enhancement points on the sensing fiber is further expressed as: (11) in For the first a , b Phase difference between the scattering enhancement points The refractive index change of the sensing fiber caused by corrosion expansion, Δd ab This refers to the change in fiber length caused by corrosion expansion, specifically the change in fiber length between two scattering enhancement points.

[0044] The strain rate between the a-th and b-th scattering enhancements on the sensing fiber: (12) in is the fiber strain refractive index coefficient, which can be regarded as a constant. For the first a , b The strain rate of the sensing fiber between the scattering enhancement points.

[0045] Equation (12) shows that the phase change of the sensing fiber induced by corrosion satisfies the relationship between the fiber strain rate and the phase change. (13) strain coefficient N for (14) In some embodiments of the present invention, substituting equation (13) into equation (9) yields the amount of pipeline mass reduction caused by corrosion, i.e., the second total pipeline loss mass, the expression for which is: (15) In the formula, Indicates the number of layers in the fiber optic sensor. This represents the strain test points on each of the m layers. This represents the length of the first arc, and ρ is the density of the steel in the pipe. Indicates the strain coefficient. , Indicates the length of the first arc. Indicates the first radius, Indicates the coefficient of volume expansion. This represents the phase difference between the a-th and b-th scattering enhancement points.

[0046] In some embodiments of the present invention, monitoring non-uniform corrosion of the pipeline based on the total mass loss of the second pipeline includes: If the mass reduction obtained by the adjacent sensing unit in the total mass loss of the second pipeline is not within the pipeline mass reduction threshold, then it is determined that there is a non-uniform corrosion state on the pipeline.

[0047] In a specific embodiment of the present invention, the mass reduction of multiple pipe units Perform threshold determination; (16) in This represents the absolute value of the reduction in pipe mass obtained by the i-th corrosion sensing unit for the j-th layer of optical fiber. The representative judges the quality change obtained by adjacent corrosion sensing units. When the quality change obtained by adjacent corrosion sensing units... Within range This assumes there is no non-uniform corrosion on the pipeline; the mass reduction between adjacent corrosion sensing units is within the range. The output is 1 if the condition is met, otherwise the output is 0. K It is a logical value accumulation number; This is the lower limit of the threshold. This represents the upper limit of the threshold.

[0048] If K = 0, it is considered that there is no corrosion state in the pipeline section, or the overall deformation of the pipeline caused by local pressurization along the pipeline; if K > r, it is considered that there is a local non-uniform corrosion area in the pipeline section. If 0 < K < r, it is considered that it is a false alarm of corrosion caused by external interference along the pipeline, where r is the judgment standard.

[0049] In order to better implement a method for monitoring non-uniform corrosion of pipelines in an embodiment of the present invention, correspondingly, based on a method for monitoring non-uniform corrosion of pipelines, as Figure 5 shown, an embodiment of the present invention further provides a device for monitoring non-uniform corrosion of pipelines. A device 500 for monitoring non-uniform corrosion of pipelines includes: A data acquisition module 501, configured to acquire the radian corresponding to a local unit of the pipeline, the first radius before pipeline corrosion, the first arc length of the local unit of the pipeline before pipeline corrosion, the second arc length of the local unit of the pipeline before pipeline corrosion, and the third radius of the local unit of the pipeline with a rust layer after corrosion. The fiber optic sensor is laid on the pipeline in a spiral layout manner, and multiple local units of the pipeline are obtained by dividing the cross-section of the pipeline according to a preset angle; A first mass reduction amount acquisition module 502, configured to acquire the volume of steel consumed by the local unit of the pipeline and the volume of corrosion products accumulated under the corrosion effect of the local unit of the pipeline, and obtain the first mass reduction amount caused by corrosion of the local unit of the pipeline based on the volume of steel; A first relationship acquisition module 503, configured to determine the first relationship between the third radius and the first radius based on the strain change caused by the expansion of the corrosion products of the local unit of the pipeline, and the strain change is obtained based on the first arc length and the second arc length; A second mass reduction amount determination module 504, configured to determine the second mass reduction amount based on the radian, the volume expansion coefficient, the strain change, the first relationship, and the first mass reduction amount, and the volume expansion coefficient is obtained based on the volume of steel and the volume of corrosion products; A first total pipeline mass loss determination module 505, configured to determine the first total pipeline mass loss according to the second mass reduction amount; A second relationship determination module 506, configured to obtain the second relationship between the phase change of the sensing optical fiber caused by corrosion and the fiber strain rate; A monitoring module 507, configured to obtain the second total pipeline mass loss based on the second relationship and the first total pipeline mass loss, and monitor the non-uniform corrosion of the pipeline according to the second total pipeline mass loss.

[0050] The device 500 for monitoring non-uniform corrosion of pipelines provided in the above embodiment can implement the technical solutions described in the embodiment of the method for monitoring non-uniform corrosion of pipelines. For the specific implementation principles of the above modules or units, reference can be made to the corresponding content in the embodiment of the method for monitoring non-uniform corrosion of pipelines, which will not be elaborated here.

[0051] like Figure 6 As shown, the present invention also provides an electronic device 600. The electronic device 600 includes a processor 601, a memory 602, and a display 603. Figure 6 Only some components of the electronic device 600 are shown, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead.

[0052] In some embodiments, processor 601 may be a central processing unit (CPU), microprocessor, or other data processing chip, used to run program code stored in memory 602 or process data, such as a pipeline non-uniform corrosion monitoring method in this invention.

[0053] In some embodiments, processor 601 may be a single server or a group of servers. The server group may be centralized or distributed. In some embodiments, processor 601 may be local or remote. In some embodiments, processor 601 may be implemented on a cloud platform. In some embodiments, the cloud platform may include a private cloud, public cloud, hybrid cloud, community cloud, distributed cloud, internal cloud, multi-cloud, or any combination thereof.

[0054] In some embodiments, memory 602 may be an internal storage unit of electronic device 600, such as a hard disk or memory of electronic device 600. In other embodiments, memory 602 may also be an external storage device of electronic device 600, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on electronic device 600.

[0055] Furthermore, the memory 602 may include both internal storage units of the electronic device 600 and external storage devices. The memory 602 is used to store application software and various types of data installed on the electronic device 600.

[0056] In some embodiments, display 603 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 603 is used to display information from electronic device 600 and to display a visual user interface. Components 601-603 of electronic device 600 communicate with each other via a system bus.

[0057] In one embodiment, when processor 601 executes a pipeline non-uniform corrosion monitoring program stored in memory 602, the following steps can be performed: The arc corresponding to the local unit of the pipeline is obtained, the first radius of the pipeline before corrosion, the first arc length of the local unit of the pipeline before corrosion, the second arc length of the local unit of the pipeline before corrosion, and the third radius of the local unit of the pipeline with rust after corrosion. The fiber optic sensor is laid on the pipeline in a spiral pattern, and the cross section of the pipeline is divided into multiple local units of the pipeline according to a preset angle. The volume of steel consumed by the local unit of the pipeline and the volume of corrosion products accumulated under the corrosion of the local unit of the pipeline are obtained, and the first mass reduction of the local unit of the pipeline caused by corrosion is obtained based on the volume of steel. The first relationship between the third radius and the first radius is determined based on the strain change caused by the expansion of corrosion products in local pipeline units. The strain change is obtained based on the first arc length and the second arc length. The second mass reduction is determined based on radianity, volume expansion coefficient, strain change, first relationship, and first mass reduction. The volume expansion coefficient is obtained based on the steel volume and corrosion product volume. The total mass loss of the first pipeline is determined based on the second mass reduction amount; To obtain a second relationship between corrosion-induced phase change in the sensing fiber and fiber strain rate; The second total pipeline loss is obtained based on the second relationship and the first total pipeline loss, and the non-uniform corrosion of the pipeline is monitored based on the second total pipeline loss.

[0058] It should be understood that when the processor 601 executes a pipeline non-uniform corrosion monitoring program in the memory 602, in addition to the functions mentioned above, it can also perform other functions, as detailed in the description of the corresponding method embodiments above.

[0059] Furthermore, the embodiments of the present invention do not specifically limit the type of electronic device 600 mentioned. Electronic device 600 can be a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, laptop computer, or other portable electronic device. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic device can also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the present invention, electronic device 600 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0060] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for monitoring non-uniform corrosion in pipelines, characterized in that, include: The arc corresponding to the local unit of the pipeline is obtained, the first radius of the pipeline before corrosion, the first arc length of the local unit of the pipeline before corrosion, the second arc length of the local unit of the pipeline before corrosion, and the third radius of the local unit of the pipeline with rust after corrosion. The fiber optic sensor is laid on the pipeline in a spiral pattern, and the cross section of the pipeline is divided into multiple local units of the pipeline according to a preset angle. The volume of steel consumed by the local unit of the pipeline and the volume of corrosion products accumulated under the corrosion of the local unit of the pipeline are obtained, and the first mass reduction of the local unit of the pipeline caused by corrosion is obtained based on the volume of steel. The first relationship between the third radius and the first radius is determined based on the strain change caused by the expansion of corrosion products in local pipeline units. The strain change is obtained based on the first arc length and the second arc length. The second mass reduction is determined based on radianity, volume expansion coefficient, strain change, first relationship, and first mass reduction. The volume expansion coefficient is obtained based on the steel volume and corrosion product volume. The total mass loss of the first pipeline is determined based on the second mass reduction amount; To obtain a second relationship between corrosion-induced phase change in the sensing fiber and fiber strain rate; The second total pipeline loss mass is obtained based on the second relationship and the first total pipeline loss mass, and the non-uniform corrosion of the pipeline is monitored based on the second total pipeline loss mass.

2. The pipeline non-uniform corrosion monitoring method according to claim 1, characterized in that, The acquisition of the volume of steel consumed by a local pipeline unit and the volume of corrosion products accumulated under the corrosion of the local pipeline unit includes: The volume of steel consumed by the local pipe unit is obtained based on the arc, the first radius, and the second radius of the rust-free layer of the local pipe unit after corrosion. The corrosion products accumulated under the local unit corrosion of the pipeline are obtained based on the arc, the second radius, and the third radius.

3. The pipeline non-uniform corrosion monitoring method according to claim 1, characterized in that, The fiber optic sensors are laid on the pipeline in a spiral, equidistant pattern.

4. The pipeline non-uniform corrosion monitoring method according to claim 2, characterized in that, The formula for the strain change is: The formula for the volume expansion coefficient is: The expression for the first formula is: In the formula, ε i j This represents the strain at the i-th measurement point on the j-th layer of the optical fiber. Indicates the length of the first arc. Indicates the length of the second arc. Indicates the first radius, R represents the third radius. w V represents the second radius, Vp represents the volume of steel consumed by a local unit of the pipe, and V r This indicates the volume of corrosion products accumulated under the influence of corrosion in a localized section of the pipeline.

5. The pipeline non-uniform corrosion monitoring method according to claim 1, characterized in that, The circumference of the pipe is greater than the distance between two adjacent scattering enhancement points in the fiber optic sensor.

6. The pipeline non-uniform corrosion monitoring method according to claim 2, characterized in that, The expression for the total mass loss of the second pipeline is: In the formula, Indicates the number of layers in the fiber optic sensor. This represents the strain test points on each of the m layers. This represents the length of the first arc, and ρ is the density of the steel in the pipe. Indicates the strain coefficient. , Indicates the length of the first arc. Indicates the first radius, Indicates the coefficient of volume expansion. This represents the phase difference between the a-th and b-th scattering enhancement points.

7. The pipeline non-uniform corrosion monitoring method according to claim 1, characterized in that, Monitoring of non-uniform corrosion in pipelines is conducted based on the total mass loss of the second pipeline, including: If the mass reduction obtained by the adjacent sensing unit in the total mass loss of the second pipeline is not within the pipeline mass reduction threshold, then it is determined that there is a non-uniform corrosion state on the pipeline.

8. A device for monitoring non-uniform corrosion of pipelines, characterized in that, include: The data acquisition module is used to acquire the arc corresponding to the local unit of the pipeline, the first radius of the pipeline before corrosion, the first arc length of the local unit of the pipeline before corrosion, the second arc length of the local unit of the pipeline before corrosion, and the third radius of the local unit of the pipeline with rust after corrosion. The fiber optic sensor is laid on the pipeline in a spiral pattern, and the cross section of the pipeline is divided into multiple local units of the pipeline according to a preset angle. The first mass reduction acquisition module is used to acquire the volume of steel consumed by the local unit of the pipeline and the volume of corrosion products accumulated under the corrosion of the local unit of the pipeline, and to obtain the first mass reduction of the local unit of the pipeline caused by corrosion based on the volume of steel. The first relationship acquisition module is used to determine the first relationship between the third radius and the first radius based on the strain change caused by the expansion of corrosion products in local pipe units. The strain change is obtained based on the first arc length and the second arc length. The second mass reduction determination module is used to determine the second mass reduction based on radian, volume expansion coefficient, strain change, first relationship and first mass reduction, where the volume expansion coefficient is obtained based on the steel volume and corrosion product volume. The first pipeline loss total mass determination module is used to determine the first pipeline loss total mass based on the second mass reduction amount; The second relationship determination module is used to obtain the second relationship between the phase change of the sensing fiber induced by corrosion and the fiber strain rate. The monitoring module is used to obtain the second total pipeline loss based on the second relationship and the first total pipeline loss, and to monitor the non-uniform corrosion of the pipeline based on the second total pipeline loss.

9. An electronic device, characterized in that, Including memory and processor, among which, The memory is used to store programs; The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps in the pipeline non-uniform corrosion monitoring method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Used to store computer-readable programs or instructions, which, when executed by a processor, can implement the steps in the pipeline non-uniform corrosion monitoring method according to any one of claims 1 to 7.

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