Pipeline corrosion testing and monitoring device based on fiber grating sensing technology
The pipeline corrosion testing and monitoring device using fiber optic grating sensing technology utilizes fiber optic grating sensors and electrochemical reaction simulation corrosion cells to achieve real-time monitoring of corrosion on the inner wall of pipelines. This solves the problem of needing to dismantle the pipeline to determine the corrosion status in existing technologies and provides a low-cost, high-efficiency monitoring solution.
Patent Information
- Application Number
- CN202422861609.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-22
AI Technical Summary
Existing technologies make it difficult to monitor pipeline corrosion in real time; the corrosion situation can only be determined after the pipeline is dismantled.
A pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology is adopted. The device acquires pipeline strain data through fiber optic grating sensors and combines cathode interface, anode interface and power supply to simulate corrosion cell to achieve real-time monitoring of corrosion on the inner wall of the pipeline.
It enables low-cost and efficient monitoring of pipeline internal wall corrosion without disassembling the pipeline, with high data accuracy and lower cost than camera-robot monitoring.
Smart Images
Figure CN223500861U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of corrosion testing, and in particular to a pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology. Background Technology
[0002] During the use of pipelines, corrosion may occur due to the influence of the external environment. In order to determine the degree of corrosion of pipelines under different external environments, a test device is needed to test the corrosion degree of the loop. However, the relevant test device requires the pipeline to be dismantled before the corrosion status can be determined, making real-time monitoring difficult. Utility Model Content
[0003] This invention provides a pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology, which solves the technical problem of how to achieve real-time monitoring of pipeline corrosion.
[0004] This utility model provides a pipeline corrosion testing and monitoring device based on fiber Bragg grating (FBG) sensing technology, applied to pipelines. The device includes: a FBG sensor disposed on the outer wall of the pipeline for acquiring strain data; a processing device connected to the FBG sensor for acquiring the strain data and determining the corrosion state of the pipeline; a cathode interface and an anode interface, the cathode interface capable of undergoing an electrochemical reaction with the inner wall of the pipeline; and a power supply, the anode of which is connected to the anode interface, and the cathode of which is connected to the cathode interface. The pipeline contains an electrolyte, the anode interface is electrically connected to the pipeline, the cathode interface extends into the pipeline and contacts the electrolyte, and the cathode interface is insulated from the pipeline.
[0005] In some embodiments, the conduit contains an electrolyte, and the anode interface is in contact with the conduit.
[0006] In some embodiments, the pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology further includes two end caps, which are used to seal the openings at both ends of the pipeline, and both end caps are detachably connected to the pipeline; the cathode interface and the anode interface both extend into the end caps and are in contact with the electrolyte in the pipeline, and the cathode interface has an insulating material between it and the first end cap.
[0007] In some embodiments, the pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology further includes: a functional tube fixed to a first end of the pipeline and communicating with the pipeline; a first end cap detachably connected to the functional tube for sealing the opening at the end of the functional tube away from the pipeline; and a second end cap detachably connected to the pipeline for sealing the opening at the second end of the pipeline opposite to the first end; wherein the cathode interface extends into the first end cap and contacts the electrolyte inside the functional tube, the anode interface is electrically connected to the pipeline through the second end cap, and an insulating material is provided between the cathode interface and the first end cap.
[0008] In some embodiments, the functional tube extends along a curve or zigzag line, and in the direction perpendicular to the extension of the pipe, the end of the functional tube furthest from the pipe is spaced at a predetermined distance from the end of the functional tube closest to the pipe.
[0009] In some embodiments, the functional tube includes a first part and a second part, the end of the first part being fixedly connected to a first end cap and the extension direction of the first part being parallel to the extension direction of the pipe, the second part being fixedly connected to the first part and the extension direction of the second part being perpendicular to the extension direction of the first part, and the end of the second part away from the pipe being detachably connected to the first end cap.
[0010] In some embodiments, the functional tube has a drain port with a drain valve, and the first end cap has a vent.
[0011] In some embodiments, the functional tube also has a liquid inlet for introducing electrolyte into the functional tube.
[0012] In some embodiments, the pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology further includes a heating element for heating the pipeline.
[0013] In some embodiments, the pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology further includes: a control pipeline, wherein the fiber optic grating sensor is disposed on the outer wall of the control pipeline; wherein the heating element is also used to heat the control pipeline.
[0014] This utility model provides a pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology. The device includes a cathode interface, an anode interface, and a power supply. The cathode interface is connected to the cathode of the power supply, and the anode interface is connected to the anode of the power supply. The cathode interface can undergo an electrochemical reaction with the inner wall of the pipeline to simulate the formation of corrosion cells in different parts of the pipeline in the external environment. Specifically, the pipeline contains an electrolyte, the anode interface is electrically connected to the pipeline, and the cathode interface is in contact with the electrolyte inside the pipeline. An insulating material is provided between the cathode interface and the pipeline. The device operates when the power supply is energized. In this state, the pipe and the anode interface form the anode portion of the corrosion cell, and the cathode interface forms the cathode portion of the corrosion cell, thereby causing corrosion of the anode interface and the corrosion cell. Simultaneously, the pipe corrosion testing and monitoring device based on fiber optic grating sensing technology also includes a fiber optic grating sensor installed on the outer wall of the pipe and a processing device connected to the fiber optic grating sensor. The fiber optic grating sensor can acquire strain data of the pipe, and the processing device acquires the strain data from the fiber optic grating sensor and determines the corrosion status of the inner wall of the pipe based on the strain data. This allows for real-time monitoring of the corrosion status of the inner wall of the pipe without disassembling the pipe. Attached Figure Description
[0015] Figure 1 A schematic diagram of the structure of the first pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology provided in this embodiment of the utility model;
[0016] Figure 2 A schematic diagram of the structure of the second pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology provided in this embodiment of the present invention;
[0017] Figure 3 A schematic diagram of the assembly of the first type of pipe and functional pipe in the pipe corrosion testing and monitoring device based on fiber optic grating sensing technology provided in this embodiment of the utility model.
[0018] Figure 4 A schematic diagram of the structure of a third type of pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology provided in this embodiment of the present invention;
[0019] Figure 5 A schematic diagram of the assembly of the second type of pipe and functional pipe in the pipe corrosion testing and monitoring device based on fiber optic grating sensing technology provided in this embodiment of the utility model;
[0020] Figure 6 A schematic diagram of the structure of the fourth pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology provided in this utility model embodiment.
[0021] Explanation of reference numerals in the attached figures
[0022] 1. Pipeline; 10. Pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology; 100. Fiber optic grating sensor; 200. Processing device; 310. Cathode interface; 320. Anode interface; 400. Power supply; 500. End cap; 510. First end cap; 511. Vent hole; 520. Second end cap; 600. Functional tube; 610. Drain port; 611. Drain valve; 620. Inlet; 630. First part; 640. Second part; 700. Heating element; 800. Control pipeline. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0024] The specific technical features described in the various embodiments in the detailed implementation can be combined in various ways without contradiction. For example, different implementation methods can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this utility model will not be described separately.
[0025] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.
[0026] Additionally, it should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate any similarity or connection between them. It should be understood that the directional descriptions such as "above," "below," "inside," and "outside" refer to the orientation under normal use conditions.
[0027] In the following specific embodiments, the pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology can perform corrosion tests on any type of pipeline, such as a test tube transport pipeline or a natural gas transport pipeline. Depending on whether liquid is introduced into the pipeline or the type of liquid introduced, the pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology can simulate the chemical corrosion or electrochemical corrosion of the pipeline. By introducing liquid containing particles into the pipeline, it can also simulate the erosion of the pipeline. Corrosion simulation and erosion simulation can also be coupled. For ease of explanation, the following uses the pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology to simulate the electrochemical corrosion of the pipeline as an example to illustrate the structure and function of the pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology. At the same time, in the following embodiments, the electrical connection between the two parts can be understood as the two parts being able to conduct electricity. The electrical connection between the two parts can be achieved by direct contact between the two parts or by connecting the two parts through a conductive structure.
[0028] In some embodiments, such as Figure 1 As shown, the pipeline corrosion test and monitoring device 10 based on fiber optic grating sensing technology generates a simulated corrosion environment for pipeline 1 and monitors the corrosion status of pipeline 1 in real time under this corrosion environment. The pipeline corrosion test and monitoring device 10 based on fiber optic grating sensing technology includes: fiber optic grating sensor 100, processing device 200, cathode interface 310, anode interface 320 and power supply 400.
[0029] Cathode interface 310 and anode interface 320 are connected to the positive and negative terminals of power supply 400, respectively. Simultaneously, cathode interface 310 can undergo an electrochemical reaction with the inner wall of the pipe. This can be understood as simulating a scenario where different parts of pipe 1 form a corrosion cell under the influence of the external environment, through power supply 400, cathode interface 310, and anode interface 320. Specifically, pipe 1 contains electrolyte, anode interface 320 is electrically connected to pipe 1, and cathode interface 310 is in contact with the electrolyte inside pipe 1. An insulating material is placed between cathode interface 310 and pipe 1 to prevent electrical connection between them. Thus, the anode region of the corrosion cell is formed through anode interface 320 and the inner wall of pipe 1, and the cathode interface region is formed through cathode interface 310. To ensure that the pipe forms the anode region of the corrosion cell rather than the cathode region, [the following is omitted as it is not part of the main text]. The anode interface 320 is made of a metal that is more prone to oxidation, such as aluminum or zinc, while the cathode interface 310 is made of a material that is less prone to oxidation, such as graphite or platinum. The anode of the power supply 400 is connected to the anode interface 320, and the cathode of the power supply 400 is connected to the cathode interface 310. A potential difference is created between the cathode interface 310 and the anode interface 320 by the power supply 400, causing electrons to flow directionally between them. This makes it less likely for electrons to be lost from the cathode interface 320, thus forming the anode region of the corrosion cell between the anode interface 320 and the pipe 1. When the power supply 400 is energized, an oxidation reaction occurs in the anode region of this corrosion cell, causing electrons to be released from the inner wall of the pipe 1 and the anode interface 320 and converted into ions. In other words, the inner wall of the pipe 1 and the anode interface 320 are corroded.
[0030] Meanwhile, the fiber optic grating sensor 100 is installed on the outer wall of the pipe to acquire strain data of the pipe. The processing device 200 is used to acquire strain data and determine the corrosion state of the inner wall of the pipe. It can be understood that after the inner wall of the pipe 1 is corroded, one or more small cracks are formed. Under the action of stress, the stress will be concentrated in the area with cracks, so that the area with cracks will generate greater strain. That is, under the condition that the stress is constant, the more severe the corrosion, the greater the strain. Thus, the degree of corrosion of the pipe can be determined by the strain data. Since the strain of the inner wall of the pipe 1 will be transmitted to the outer wall of the pipe, the fiber optic grating sensor 100 installed on the outer wall of the pipe 1 can acquire the strain data of the pipe 1 and determine the corrosion state of the inner wall of the pipe 1 based on the strain data.
[0031] It should be noted that, in addition to forming a corrosion cell by introducing electrolyte into the pipeline 1, the hydraulic pressure provided by the electrolyte can also simulate the stress generated when the pipeline 1 transmits liquid and cause the corroded pipeline to produce strain under the action of the stress. That is, the strain data obtained by the fiber optic grating sensor 100 is closer to the strain generated by the pipeline due to corrosion in the actual scenario, and the test data obtained by the pipeline corrosion test and monitoring device 10 based on fiber optic grating sensing technology is closer to the actual scenario. Since electrolyte is introduced into pipe 1, it is necessary to prevent electrolyte leakage from the inside of pipe 1. Depending on the usage posture or structure of the pipe, the method of preventing electrolyte leakage will vary. For example, when the pipe is a U-shaped pipe, by making the two openings of the U-shaped pipe face vertically upward, electrolyte leakage can be prevented without sealing the openings of pipe 1. For example, when the pipe extends in a straight line, after the anode connector 320 is inserted into the pipe, sealing material is filled between the anode connector 320 and the inner wall of the pipe to seal the opening. Then, the pipe is placed vertically, with the sealed opening at the bottom and the unsealed opening at the top, thereby preventing electrolyte leakage by sealing only one end of the opening. Compared to disassembling the pipe and observing its inner wall to determine corrosion, using a fiber optic grating sensor 100 and strain data to determine the corrosion of the pipe 1's inner wall allows for real-time monitoring of corrosion without disassembling the pipe. Furthermore, compared to monitoring methods involving cameras and robots installed inside the pipe, the cost of the fiber optic grating sensor 100 is significantly lower. Moreover, pipes often transport liquids or gases, which can affect the lifespan and image quality of cameras and robots. Additionally, cameras and robots located inside pipes cannot easily transmit image data outwards in real time. Therefore, monitoring the corrosion of the pipe 1's inner wall using the fiber optic grating sensor 100 achieves better monitoring results at a lower cost. Optionally, the fiber optic grating sensor 100 can be a strain gauge type fiber optic grating sensor, or it can be a fiber optic grating sensor with higher precision.
[0032] Optionally, multiple fiber Bragg grating sensors 100 are spaced apart along the extension direction of the pipeline 1. The strain data of different parts of the pipeline are acquired through the fiber Bragg grating sensors, and the corrosion status of different parts of the pipeline 1 is determined by the acquired strain data of each part.
[0033] Optionally, the pipeline corrosion testing and detection device 1 based on fiber Bragg grating technology can also be used to simulate ordinary pipeline corrosion, accelerating the corrosion rate through electrochemical reactions, and causing the pipeline to enter a long-term corrosion state in a shorter time, thereby shortening the corrosion test duration. This utility model embodiment provides a pipeline corrosion testing and monitoring device based on fiber Bragg grating sensing technology. This device includes: a cathode interface, an anode interface, and a power supply. The cathode interface is connected to the cathode of the power supply, and the anode interface is connected to the anode of the power supply. The cathode interface can undergo an electrochemical reaction with the inner wall of the pipeline to simulate the formation of corrosion cells in different parts of the pipeline in the external environment. Specifically, the pipeline contains an electrolyte, the anode interface is electrically connected to the pipeline, the cathode interface is in contact with the electrolyte inside the pipeline, and an insulating material is provided between the cathode interface and the pipeline. Under electrical conditions, the pipe and anode interface form the anode portion of the corrosion cell, and the cathode interface forms the cathode portion, thereby corroding both the anode interface and the corrosion cell. Simultaneously, the pipe corrosion testing and monitoring device based on fiber optic grating sensing technology also includes a fiber optic grating sensor installed on the outer wall of the pipe and a processing device connected to the fiber optic grating sensor. The fiber optic grating sensor acquires strain data of the pipe, and the processing device acquires the strain data from the fiber optic grating sensor and determines the corrosion status of the inner wall of the pipe based on the strain data. This enables real-time monitoring of the corrosion status of the inner wall of the pipe without disassembling the pipe.
[0034] In some embodiments, such as Figure 2 As shown, the anode interface 320 is in contact with the pipe 1. The direct contact between the anode interface 320 and the pipe 1 enables the anode interface 320 to be electrically connected to the pipe 1, thereby enabling the anode interface 320 and the pipe 1 to jointly form the anode of the corrosion cell, which in turn causes the pipe 1 to be corroded. The anode interface 320 can be in direct contact with the outer surface of the pipe 1, or it can be in contact with the outer or inner surface of the pipe 1 through a conductive structure.
[0035] In some embodiments, the test apparatus, such as Figure 1As shown, the pipeline corrosion testing and monitoring device 10 based on fiber optic grating sensing technology also includes two end caps 500. The two end caps 500 are used to seal the openings at both ends of the pipeline 1, and are detachably connected to the two openings of the pipeline 1. This means that when the end caps 500 are assembled with the openings, they seal the openings; when the end caps 500 are removed, the openings of the pipeline 1 are open. When it is necessary to inject electrolyte into the pipeline 1, the end caps 500 are removed, and electrolyte is introduced into the pipeline through the openings. After the electrolyte has been introduced, the end caps 500 are reconnected to the openings of the pipeline 1, thereby sealing the openings and preventing electrolyte leakage. The cathode interface 310 passes through the end cap 500 and comes into contact with the electrolyte in the pipe 1. The anode interface 320 is electrically connected to the pipe through the end cap 500. It can be understood that the end cap 500 not only seals the opening, but also provides installation space for the cathode interface 310 and the anode interface 320. This prevents electrolyte leakage while allowing the cathode interface 310 to come into contact with the electrolyte in the pipe 1 and the anode interface 320 to form an electrical connection with the pipe 1. An insulating material is provided between the cathode interface 310 and the end cap 500. This insulating material can also be understood as being located between the interface 310 and the pipe 1. This insulating material can prevent the cathode interface 310 from forming an electrical connection with the pipe 1 through the end cap 500.
[0036] Optionally, the anode interface 320 is integrally formed with the end cap 500, thereby improving the reliability of the opening seal.
[0037] Optionally, the end cap 500 for mounting the cathode interface 310 and the end cap 500 for mounting the anode interface 320 have different structures. For example, the end cap 500 for mounting the cathode interface 310 has a mounting hole into which the cathode interface 310 extends and forms an interference fit, allowing the cathode interface 310 to contact the electrolyte in the pipe 1 while still maintaining the ability to seal the opening. Simultaneously, an insulating material is provided on the inner wall of the mounting hole. The end cap 500 for mounting the anode interface 320 is made of a conductive material, and the anode interface 320 extends into the end cap. 500 and contact the end cap 500, so that the anode interface 320 can be electrically connected to the pipe 1. Alternatively, the end cap 500 is made of insulating material and a wire is embedded inside the end cap 500. When the end cap 500 is assembled with the pipe 1, the wire is in direct contact with the inner wall of the pipe 1. When the anode interface 320 extends into the end cap 500, the wire can directly contact the anode interface 320, so that the anode interface 320 can form an electrical connection with the inner wall of the pipe 1 through the wire inside the end cap 500, and the insulating part of the end cap 500 will not form the anode of the corrosion cell together with the pipe 1.
[0038] In some embodiments, such as Figure 3 As shown, the pipeline corrosion testing and monitoring device 10 based on fiber optic grating sensing technology further includes: a functional tube 600, a first end cap 510, and a second end cap 520. The functional tube 600 is fixed to the first end of the pipeline 1 and communicates with the pipeline 1. It can be understood that both the pipeline 1 and the functional tube 600 can contain electrolyte, thereby allowing more electrolyte to participate in the electrochemical reaction, accelerating the reaction rate and duration. The first end cap 510 is detachably connected to the functional tube 600 and is used to seal the opening at the end of the functional tube 600 away from the pipeline 1. The second end cap 520 is detachably connected to the pipeline 1 and is used to seal the opening at the second end of the pipeline 1 opposite to the first end. It can be understood that after the functional tube 600 and the pipeline 1 are assembled, one end of the pipeline 1 has an unsealed opening, and one end of the functional tube 600 also has an unsealed opening. The first end cap 510 and the second end cap 520 seal the two openings, thereby preventing electrolyte leakage from the two openings. Alternatively, a sealing structure may be provided at the connection between the functional tube 600 and the pipe 1 to prevent electrolyte leakage from the joint between the functional tube 600 and the pipe 1.
[0039] The cathode interface 310 extends into the first end cap 510 and contacts the electrolyte in the functional tube 600. The anode interface 320 extends into the second end cap 520 and is electrically connected to the pipe 1 through the second end cap 520. That is, the first end cap 510 and the second end cap 520 provide installation space for the cathode interface 310 and the anode interface 320, respectively, and enable the cathode interface 310 to contact the electrolyte and enable the anode interface 320 to form an electrical connection with the pipe 1. There is an insulating material between the cathode interface 310 and the first end cap 510 to prevent the cathode interface 310 from forming an electrical connection with the pipe 1 through the first end cap 510.
[0040] In some embodiments, such as Figure 3 As shown, the functional tube 600 extends along a curve or zigzag line, and in the extension direction perpendicular to the pipe 1, the distance between the end of the functional tube 600 away from the pipe 1 and the end of the functional tube 600 near the pipe 1 is a preset distance. That is, the functional tube 600 extends along a curve so that it can extend away from the pipe 1 in the extension direction perpendicular to the pipe 1, thereby allowing the end of the functional tube 600 away from the pipe 1 to be located above the pipe 1. If the electrolyte in the pipe 1 is consumed or the pipe 1 is not filled with electrolyte, the electrolyte in the functional tube 600 can enter the pipe 1 under its own gravity, thereby achieving automatic replenishment of the electrolyte in the pipe 1. Optionally, as... Figure 3As shown, the functional tube 600 includes a first part 630 and a second part 640. The end of the first part 630 is fixedly connected to the first part of the pipe 1, and the extension direction of the first part 630 is parallel to the extension direction of the pipe 1 to facilitate the connection between the functional tube 600 and the pipe 1. The extension direction of the second part 640 is perpendicular to the extension direction of the first part 630, so that the second part 640 can extend away from the pipe 1. The end of the second part 640 away from the pipe 1 is detachably connected to the first end cap 510.
[0041] In some embodiments, such as Figure 4 As shown, the functional tube 600 has a drain port 610, which is equipped with a drain valve 611. The drain valve 611 can control the opening and closing of the drain port 610. It should be noted that as the pipe 1 is continuously corroded, the anode interface 320 and the pipe 1 are converted into ions and dissolved in the electrolyte. However, the electrolyte has a limited capacity to accommodate the anode interface 320 and the pipe 1. If the electrolyte reaches saturation in accommodating the ions in the anode interface 320 and the pipe 1, the electrochemical reaction will not be able to continue. Therefore, the electrolyte needs to be replaced after the corrosion test is completed. By opening the drain valve 611, the electrolyte can be easily discharged from the pipe 1, which facilitates the subsequent replacement of the electrolyte. The first end cap 510 also has a vent hole 511. By setting the vent hole 511 to communicate with the outside air, the air pressure in the functional tube 600 and the pipe 1 is kept in balance with the atmospheric pressure, thereby reducing the difficulty of draining the electrolyte from the drain port 610.
[0042] Optionally, the experimental setup may also include a discharge pool to contain the discharged electrolyte, thereby reducing environmental pollution.
[0043] In some embodiments, such as Figure 5 As shown, the functional tube 600 also includes an inlet 620, which is used to introduce electrolyte into the functional tube 600. This can be understood as enabling the electrolyte to be renewed during the test. Specifically, by periodically draining the electrode solution containing ions from the pipe 1 and the anode interface 320 from the drain port 610 and introducing new electrolyte into the functional tube 600 through the inlet 620, the electrolyte is renewed, thus allowing the electrochemical reaction to have a higher reaction rate. Optionally, introducing different types of electrolyte into the functional tube 600 through the inlet 620 can simulate the corrosion state of the pipe under different electrolyte environments. Optionally, while renewing the electrolyte, the electrolyte can form a flow within the pipe 1. By adding particles to the introduced electrolyte, the particles can erode the inner wall of the pipe 1 under the action of the flow, thereby achieving a coupled test of electrochemical corrosion and erosion of the pipe.
[0044] It should be noted that, in function tube 600, as... Figure 3 In the case of the curved tube shown, the distance between the inlet 620 and the pipe 1 is greater than the distance between the outlet 610 and the pipe in the direction perpendicular to the extension of the pipe 1, which makes drainage more convenient. Moreover, both the inlet 620 and the outlet 610 are located at the end of the functional tube 600 closest to the pipe 1, so that the outlet 610 and the inlet 620 will not interfere with the cathode interface 310, thus facilitating the installation of the cathode interface 310. Furthermore, during use, by placing the functional tube 600 vertically, the first end cap 510 is located at the top of the functional tube 600. When draining the electrolyte through the outlet 610, the liquid level in the functional tube 600 is lower than that in the first end cap 510, which allows for smoother drainage while preventing electrolyte leakage from the vent hole of the first end cap 510.
[0045] Optionally, the portion of the functional tube 600 near the first end cap 510 is transparent, allowing observation of the electrolyte level inside the functional tube 600. If the electrolyte level inside the functional tube 600 is lower than the cathode interface 310, resulting in the cathode interface 310 being unable to contact the electrolyte, the electrolyte needs to be replenished.
[0046] In some embodiments, such as Figure 6 As shown, the pipeline corrosion testing and monitoring device 10 based on fiber optic grating sensing technology also includes a heating element 700. The heating element 700 is used to heat the pipeline, thereby simulating the corrosion of the pipeline by electrochemical reactions under different temperature scenarios. Optionally, the heating element 700 can directly contact the pipeline 1 to directly heat the pipeline; alternatively, the heating element 700 can act on the electrolyte to indirectly heat the pipeline by heating the electrolyte.
[0047] In some embodiments, such as Figure 6As shown, the pipeline corrosion testing and monitoring device 10 based on fiber optic grating sensing technology also includes a control pipeline 800. The outer wall of the control pipeline 800 is equipped with a fiber optic grating sensor 100. The heating element 700 is also used to heat the control pipeline 800. It should be noted that in order to simulate the corrosion of the pipeline by electrochemical reaction under different temperature scenarios, the pipeline 1 needs to be heated by the heating element 700. However, heating the pipeline 1 will also cause the pipeline 1 to produce strain, and this strain is not caused by corrosion. In order to exclude the part of the strain data caused by heating, a control test needs to be set up. That is, the structure, size and material of the control pipeline 800 are exactly the same as those of the pipeline 1. The control pipeline 800 and the pipeline 1 are heated simultaneously by the heating element 700 under the same conditions. The strain generated by the control pipeline 800 can be regarded as the strain data generated by the pipeline 1 under the action of heating. By subtracting the strain data of the control pipeline from the strain data of the pipeline 1, the strain generated by the pipeline 1 under the action of electrochemical corrosion can be obtained, so as to make a more accurate judgment on the corrosion state of the pipeline.
[0048] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model.
Claims
1. A pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology, applied to pipelines, characterized in that, The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology includes: A fiber optic grating sensor is installed on the outer wall of the pipe to acquire strain data of the pipe. A processing device, connected to the fiber Bragg grating sensor, is used to acquire the strain data and determine the corrosion state of the pipeline; The cathode interface and the anode interface are provided, wherein the cathode interface is capable of undergoing an electrochemical reaction with the inner wall of the pipe. A power supply, wherein the anode of the power supply is connected to the anode interface, and the cathode of the power supply is connected to the cathode interface; The pipe contains an electrolyte, the anode interface is electrically connected to the pipe, the cathode interface extends into the pipe and contacts the electrolyte, and there is an insulating material between the cathode interface and the pipe.
2. The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology according to claim 1, characterized in that, The anode interface is in contact with the pipe.
3. The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology according to claim 1, characterized in that, The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology also includes two end caps, which are used to seal the openings at both ends of the pipeline, and both end caps are detachably connected to the pipeline. The anode interface is electrically connected to the pipeline through the end cap, the cathode interface extends into the end cap and contacts the electrolyte in the pipeline, and there is an insulating material between the cathode interface and the end cap.
4. The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology according to claim 3, characterized in that, The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology also includes: A functional tube is fixed to the first end of the pipe and is connected to the pipe; A first end cap, detachably connected to the functional tube, is used to seal the opening at the end of the functional tube away from the pipe. The second end cap is detachably connected to the pipe and is used to seal the opening of the second end of the pipe opposite to the first end; The cathode interface extends into the first end cap and contacts the electrolyte in the functional tube. There is an insulating material between the cathode interface and the first end cap. The anode interface is electrically connected to the pipeline through the second end cap.
5. The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology according to claim 4, characterized in that, The functional tube extends along a curve or zigzag line, and in the direction perpendicular to the extension of the pipe, the end of the functional tube away from the pipe is spaced at a preset distance from the end of the functional tube near the pipe.
6. The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology according to claim 5, characterized in that, The functional tube includes a first part and a second part. The end of the first part is fixedly connected to the first end cap, and the extension direction of the first part is parallel to the extension direction of the pipe. The second part is fixedly connected to the first part, and the extension direction of the second part is perpendicular to the extension direction of the first part. The end of the second part away from the pipe is detachably connected to the first end cap.
7. The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology according to any one of claims 4 to 6, characterized in that, The functional tube has a drain port, the drain port is equipped with a drain valve, and the first end cap has a vent hole.
8. The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology according to claim 7, characterized in that, The functional tube also has a liquid inlet for introducing electrolyte into the functional tube.
9. The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology according to claim 1, characterized in that, The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology also includes: A heating element for heating the pipe.
10. The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology according to claim 9, characterized in that, The pipeline corrosion testing and monitoring device based on fiber optic grating sensing technology also includes: The reference pipe has the fiber optic grating sensor installed on its outer wall. The heating element is also used to heat the control pipe.