A monitoring and evaluation system and method for detecting pipeline deformation caused by leakage by using optical fiber electromagnetic method

Abstract

The application discloses a kind of optical fiber electromagnetic method fusion detection pipeline leakage deformation monitoring evaluation system and method, including to be measured pipeline, fill soil model, hydraulic pressure mechanism, electromagnetic method measuring line system, metal probe, current emission mechanism, stabilized voltage external power supply, magnetic probe array, distributed optical fiber system, central signal processor and analysis storage terminal;Magnetic probe array, distributed optical fiber system acquisition data information transmission to central signal processor, central signal processor is received to data information in real time processing, and through analysis storage terminal accurately evaluates pipeline leakage and deformation state;Evaluation method includes to be measured pipeline deformation, leakage range, leakage duration and temperature are parameter assigned, calculate pipeline safety state total score, determine the safety state of to be measured pipeline and make corresponding processing strategy step.The application has the advantages of simple operation, strong applicability, high monitoring precision, and has important engineering application value.

Description

Technical Field

[0001] This invention relates to the field of pipeline leakage monitoring technology, and in particular to a monitoring and evaluation system and method for detecting pipeline leakage deformation using fiber optic electromagnetic fusion detection. Background Technology

[0002] Safety assessment of pipeline leakage and deformation is of great significance in the operation and maintenance of infrastructure such as municipal pipe networks and industrial pipelines. With the acceleration of urbanization and industrial development in my country, the scale of underground pipe networks is constantly expanding, and the problem of pipeline leakage and deformation is becoming increasingly prominent, directly affecting the safe operation of cities and the stability of industrial production. At present, the safety assessment of pipeline leakage and deformation at home and abroad mainly adopts single-indicator assessment or experience-based judgment methods, lacking a systematic assessment method, and making it difficult to accurately reflect the actual safety status of pipelines.

[0003] Existing assessment methods often treat leakage and deformation as independent factors, neglecting the correlation between the two. Furthermore, the assessment results are highly subjective and lack unified quantitative standards. Simultaneously, traditional assessment methods do not adequately consider environmental factors, failing to comprehensively reflect the actual operating conditions of the pipeline. In practical applications, the lack of a scientific assessment system makes it difficult for pipeline maintenance personnel to accurately determine the pipeline's safety level and take timely appropriate measures, easily leading to safety hazards. Moreover, the selection and weighting of assessment indicators in existing technologies lack scientific basis, making it difficult for the assessment results to provide effective guidance for pipeline maintenance and emergency repair decisions. Summary of the Invention

[0004] Technical Problem Solved: Addressing the technical problems existing in the prior art, this invention provides a monitoring and evaluation system and method for detecting pipeline leakage and deformation using fiber optic electromagnetic fusion detection. The system constructs a monitoring and evaluation system for detecting pipeline leakage and deformation. By establishing a comprehensive evaluation index system centered on pipeline deformation, leakage range, duration, and ambient temperature, and employing a scientific weighting method, each index is quantified and scored to achieve an objective assessment of the pipeline's safety status. Effective handling strategies are then implemented, providing a scientific, reliable, and easy-to-operate monitoring and evaluation system and method for pipeline safety status.

[0005] Technical solution: The present invention provides a monitoring and evaluation system for detecting pipeline leakage and deformation using fiber optic electromagnetic methods. The monitoring and evaluation system includes:

[0006] The pipe to be tested;

[0007] The soil filling model is a geological environment simulating the underground pipeline laid out along the pipeline to be tested. It is made of multi-layered mixed soil compacted together. The materials of the soil filling model include, but are not limited to, sand, clay and loam, and its compaction degree is ≥90%.

[0008] A hydraulic pressure applying mechanism is applied to the soil filling model to simulate the underground pressure, and continuously adjustable pressure of 0-20 MPa is accurately controlled and applied;

[0009] An electromagnetic method measuring line system is laid on the soil filling model along the pipeline to be measured, and a plurality of high-precision multi-channel digital acquisition measuring lines are laid at intervals;

[0010] A metal probe includes a plurality of metal probes corresponding to the electromagnetic method measuring line system, which is vertically inserted into the soil filling model;

[0011] A current emitting mechanism is electrically connected to the metal probe through a connecting cable;

[0012] A stabilized external power supply is electrically connected to the current emitting mechanism;

[0013] A magnetic probe array is distributed on the soil filling model;

[0014] A distributed optical fiber system includes a plurality of distributed optical fibers distributed on the inner wall of the pipeline to be measured;

[0015] A central signal processor is electrically connected to the magnetic probe array and the distributed optical fiber system, and can collect and process monitoring information data in real time;

[0016] An analysis and storage terminal is electrically connected to the central signal processor, which can store, analyze and visually display data information.

[0017] Preferably, the spacing between two adjacent measuring lines is adjustable, and the spacing is set to 0.5-2m; the length of the metal probe is 0.5-3m.

[0018] Preferably, the output current range of the current emitting mechanism is 0-100A, and the frequency range is 1-10000Hz; the stabilized external power supply provides a stable voltage output of 220V±10%.

[0019] Preferably, the measurement accuracy of the magnetic probe array is ±0.01nT; the spatial resolution of the distributed optical fiber system is ≥0.1m, the strain measurement accuracy is ≥1με, and the sampling frequency is ≥100Hz.

[0020] This invention also discloses an evaluation method for pipeline leakage and deformation fusion detection using fiber optic electromagnetic methods. The method employs a monitoring and evaluation system where data collected by the magnetic probe array and distributed fiber optic system is transmitted to a central signal processor via a high-speed data bus. The central signal processor processes the received electromagnetic field data and fiber optic strain data in real time and performs a precise evaluation of the pipeline leakage and deformation status through an analysis and storage terminal. The evaluation method includes the following steps:

[0021] Step 1: Use the scoring method to measure the deformation, leakage range, leakage duration, and temperature of the pipeline under test.

[0022] The parameters are assigned scores to obtain the deformation score S1, leakage range score S2, leakage duration score S3, and temperature score S4, respectively.

[0023] Step 2: Calculate the total score for pipeline safety status: S = 0.35 S1 + 0.3 S2 + 0.2 S3 + 0.1 S4;

[0024] Step 3: Determine the safety status of the pipeline under test based on the total score S obtained, and make corresponding handling strategies.

[0025] Preferably, the specific method for assigning the deformation of the pipe to be tested in step 1 is as follows:

[0026] Deformation ≤ 3mm, score 20;

[0027] Deformation amount 3~8mm, assigned score 40;

[0028] The deformation is 8~12mm, and the assigned score is 60.

[0029] The deformation is 12~15mm, and the assigned score is 80.

[0030] If the deformation is greater than 15mm, the score is 100.

[0031] Preferably, the specific scoring method for the leakage range of the pipeline to be tested in step 1 is as follows:

[0032] Leakage range ≤ 0.2m 2 The score is 20.

[0033] The leakage range is 0.2~0.5mm, and the score is 40.

[0034] The leakage range is 0.5~1mm, and the score is 60.

[0035] The leakage range is 1~2mm, and the score is 80.

[0036] If the leakage range is greater than 2mm, the score is 100.

[0037] Preferably, the specific scoring method for the leakage duration of the pipeline to be tested in step 1 is as follows:

[0038] the leakage duration is ≤12h, and the score is 20;

[0039] the leakage duration is 12-48h, and the score is 40;

[0040] the leakage duration is 48-120h, and the score is 60;

[0041] the leakage duration is 120-240h, and the score is 80;

[0042] the leakage duration is >240h, and the score is 100.

[0043] Preferably, the specific scoring method for the temperature of the pipeline to be tested in step 1 is as follows:

[0044] the temperature is 12-25℃, and the score is 20;

[0045] the temperature is 25-35℃, and the score is 40;

[0046] the temperature is 35-45℃, and the score is 60;

[0047] the temperature is 45-55℃, and the score is 80;

[0048] the temperature is >55℃, and the score is 100.

[0049] Preferably, the specific evaluation method for the safety state of the pipeline to be tested in step 3 is as follows:

[0050] the total score S is 0-40, and the pipeline to be tested is in a normal state;

[0051] the total score S is 41-60, and the pipeline to be tested is subjected to early warning monitoring;

[0052] the total score S is 61-80, and the pipeline to be tested is subjected to emergency treatment;

[0053] the total score S is 81-100, and the pipeline to be tested is subjected to urgent repair.

[0054] Compared with the prior art, the present application has at least the following beneficial effects:

[0055] 1. The present application establishes a complete pipeline leakage and deformation monitoring and evaluation system, which applies accurate and controllable pressure to the filled soil model by using a hydraulic pressure applying mechanism, cooperates with an electromagnetic method measuring line system and a distributed optical fiber system to conduct omnibearing monitoring on the pipeline to be tested, and realizes high-precision real-time monitoring on the pipeline leakage and deformation state; the central signal processor is used for real-time fusion processing on the multi-source data, and the analysis storage terminal is used for intelligent analysis.

[0056] 2. This assessment method achieves scientific quantification of pipeline safety status through comprehensive scoring of multi-dimensional indicators, overcoming the limitations of traditional single-indicator assessment methods and improving the accuracy and reliability of assessment results. It adopts a scientific weighting method, reasonably considering the influence weights of factors such as deformation degree, leakage range, duration and ambient temperature, making the assessment results more objective and comprehensive, effectively avoiding errors caused by subjective experience judgment, and providing a reliable technical basis for pipeline safety management.

[0057] 3. This monitoring and evaluation system not only achieves accurate assessment of pipeline safety status, but also has the advantages of simple operation and strong applicability, providing reliable technical support for pipeline safety management. By establishing a complete monitoring and evaluation system, it significantly improves the accuracy and reliability of pipeline leakage and deformation monitoring, providing strong protection for pipeline safe operation and having important engineering application value. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the monitoring and evaluation system structure of the present invention;

[0059] Figure 2 for Figure 1 Schematic diagram of distributed optical fiber deployment structure ((a) 3D view of the pipeline; (b) end view of the pipeline);

[0060] Figure 3 This is a schematic diagram of the pipeline leakage deformation assessment process in this invention.

[0061] Reference numerals in the attached diagram: 1. Hydraulic pressure application mechanism; 2. Soil backfill model; 3. Electromagnetic surveying system; 4. Metal probe; 5. Pipeline to be measured; 6. Magnetic probe array; 7. Central signal processor; 8. Analysis and storage terminal; 9. Current emission mechanism; 10. Stabilized external power supply; 11. Distributed optical fiber system. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-3 The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0063] Example 1: As Figures 1-2As shown, the present application discloses a kind of optical fiber electromagnetic method fusion detection pipeline leakage deformation monitoring and evaluation system, and monitoring and evaluation system includes to be measured pipeline 5, fill model 2, hydraulic pressure mechanism 1, electromagnetic method measuring line system 3, metal probe 4, current emission mechanism 9, stable voltage external power supply 10, magnetic probe array 6, distributed optical fiber system 11, central signal processor 7 and analysis storage terminal 8.

[0064] Fill model 2 is along the to-be-measured pipeline 5 Geological environment of simulated stratum of underground pipeline is laid out, and is formed by compaction of multi-level mixed soil, and the material of fill model 2 includes but is not limited to sand, clay and loam and other multi-level mixed soil, after professional compaction treatment, the compaction degree of fill model 2 is ≥90%, to simulate the geological conditions where the underground pipeline is located.

[0065] Hydraulic pressure mechanism 1 is applied to fill model 2 to simulate underground pressure, and accurately control and apply 0~20MPa continuous adjustable pressure, realize the pressure accurate control of fill model 2, so that the to-be-measured pipeline 5 produces controllable leakage deformation.In an optional embodiment, hydraulic pressure mechanism 1 can adopt hydraulic drive cylinder and hydraulic oil station to provide pressure output for fill model 2.

[0066] Electromagnetic method measuring line system 3 is laid along the to-be-measured pipeline 5 on fill model 2, which adopts multiple high-precision multi-channel digital acquisition measuring lines arranged at intervals, the spacing of adjacent two measuring lines is adjustable, and the spacing is set to 0.5~2m;Metal probe 4 includes multiple corresponding arrangement with electromagnetic method measuring line system 3, metal probe 4 is vertically inserted into fill model 2, the length of metal probe 4 is 0.5~3m, and forms a complete electromagnetic detection network.

[0067] Current emission mechanism 9 is electrically connected with metal probe 4 through connecting cable respectively, stable voltage external power supply 10 is electrically connected with current emission mechanism 9, the output current range of current emission mechanism 9 is 0~100A, and the frequency range is 1~10000Hz;Stable voltage external power supply 10 provides 220V±10% stable voltage output, stable voltage external power supply 10 is used to power current emission mechanism 9, the output voltage of power supply is stable, and the anti-interference ability is strong;Current emission mechanism 9 adopts digital control technology, can generate a variety of waveform excitation signals, and is injected into fill model 2 through metal probe 4 array to form stable electromagnetic field distribution.

[0068] Magnetic probe array 6 is correspondingly distributed on fill model 2, the measurement accuracy of magnetic probe array 6 is ±0.01nT, and electromagnetic method measuring line arranged along the pipeline can continuously monitor the electromagnetic field change around to-be-measured pipeline 5 through magnetic probe array 6, and monitor in all directions, monitoring data is collected and transmitted to central signal processor 7 in real time.

[0069] The distributed optical fiber system 11 includes a plurality of distributed optical fibers distributed on the inner wall of the pipeline 5 to be measured, and has a spatial resolution of greater than or equal to 0.1 m, a strain measurement accuracy of greater than or equal to 1 με, and a sampling frequency of greater than or equal to 100 Hz, and can monitor multi-dimensional strain data of the pipeline 5 to be measured in real time. In an optional embodiment, the distributed optical fibers arranged along the inner wall of the pipeline 5 to be measured are four.

[0070] The central signal processor 7 is electrically connected with the magnetic probe array 6 and the distributed optical fiber system 11, and can collect and process monitoring information data in real time; the analysis and storage terminal 8 is electrically connected with the central signal processor 7, and can store, analyze and visually display data information. In an optional embodiment, the analysis and storage terminal 8 can realize its functions by using a computer system. When the pipeline 5 to be measured deforms due to leakage, the electromagnetic method measuring line system 3 captures electromagnetic field anomalies, and the distributed optical fiber system 11 continuously monitors strain changes of the pipeline 5 to be measured at a sampling frequency of not less than 100 Hz, all monitoring data are transmitted to the central signal processor 7 for comprehensive processing and analysis, and the computer system is used for analysis, so that all-around and high-precision monitoring and evaluation of the deformation state of the pipeline 5 to be measured due to leakage can be realized.

[0071] The present application establishes a complete pipeline leakage and deformation monitoring and evaluation system, which applies precise and controllable pressure to the filling model 2 by using the hydraulic pressure applying mechanism 1, comprehensively monitors the pipeline 5 to be measured by using the electromagnetic method measuring line system 3 and the distributed optical fiber system 11, and realizes high-precision real-time monitoring of the pipeline leakage and deformation state; the central signal processor 7 is used for real-time fusion processing of multi-source data, and the analysis and storage terminal 8 is used for intelligent analysis; the monitoring and evaluation system not only realizes accurate evaluation of the pipeline safety state, but also has the advantages of simple operation and strong applicability, and can provide reliable technical support for pipeline safety management; by establishing a complete monitoring and evaluation system, the accuracy and reliability of pipeline leakage and deformation monitoring are significantly improved, and a powerful guarantee is provided for pipeline safe operation, and the monitoring and evaluation system has important engineering application value.

[0072] Embodiment 2: as shown in Figure 3 The present application also discloses an evaluation method for detecting pipeline leakage and deformation by using optical fiber electromagnetic fusion, which uses the monitoring and evaluation system, data information collected by the magnetic probe array 6 and the distributed optical fiber system 11 is transmitted to the central signal processor 7 through a high-speed data bus, the central signal processor 7 processes electromagnetic field data and optical fiber strain data received in real time, and the analysis and storage terminal 8 is used for accurate evaluation of the pipeline leakage and deformation state; the evaluation method includes the following steps:

[0073] Step 1: using the assignment method, respectively evaluating the deformation amount, leakage range, leakage duration and temperature of the pipeline 5 to be measured

[0074] The line parameter scores are assigned, respectively, to obtain the deformation score S1, the leakage range score S2, the leakage duration score S3 and the temperature score S4. The specific assignment method for the deformation of the pipeline 5 to be tested is: deformation ≤3mm, score 20; deformation 3-8mm, score 40; deformation 8-12mm, score 60; deformation 12-15mm, score 80; deformation >15mm, score 100.

[0075] The specific assignment method for the leakage range of the pipeline 5 to be tested is: leakage range ≤0.2m 2 , score 20; leakage range 0.2-0.5mm, score 40; leakage range 0.5-1mm, score 60; leakage range 1-2mm, score 80; leakage range >2mm, score 100.

[0076] The specific assignment method for the leakage duration of the pipeline 5 to be tested is: leakage duration ≤12h, score 20; leakage duration 12-48h, score 40; leakage duration 48-120h, score 60; leakage duration 120-240h, score 80; leakage duration >240h, score 100.

[0077] The specific assignment method for the temperature of the pipeline 5 to be tested is: temperature 12-25℃, score 20; temperature 25-35℃, score 40; temperature 35-45℃, score 60; temperature 45-55℃, score 80; temperature >55℃, score 100.

[0078] Step 2: Calculate the total score S of the pipeline safety state S=0.35 S1+0.3 S2+0.2 S3+0.1 S4.

[0079] Step 3: Determine the safety state of the pipeline 5 to be tested according to the total score S obtained, and make corresponding treatment strategies. The specific evaluation method for the safety state of the pipeline 5 to be tested is: total score S is 0-40, the pipeline 5 to be tested is in normal state; total score S is 41-60, the pipeline 5 to be tested is pre-alarmed and monitored; total score S is 61-80, the pipeline 5 to be tested is emergently treated; total score S is 81-100, the pipeline 5 to be tested is urgently repaired.

[0080] The evaluation method of the present application realizes scientific quantification of the safety state of the pipeline through comprehensive scoring of multi-dimensional indexes, overcomes the limitations of traditional single-index evaluation methods, and improves the accuracy and reliability of the evaluation results; scientific weight allocation methods are adopted, and the influence weights of factors such as deformation degree, leakage range, duration and environmental temperature are reasonably considered, so that the evaluation results are more objective and comprehensive, and errors caused by subjective experience judgment are effectively avoided, thereby providing a reliable technical basis for pipeline safety management.

[0081] The above is the preferred embodiment of the present application. It should be pointed out that, for ordinary skilled persons in the technical field, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A monitoring and evaluation system for detecting deformation of a pipeline leak by optical fiber electromagnetic fusion, characterized by, The monitoring and evaluation system comprises: a pipeline (5) to be tested; a soil filling model (2) simulating the geological environment of the stratum of the underground pipeline along the pipeline (5) to be tested, which is compacted by mixed soil of multiple layers, and the material of the soil filling model (2) includes but is not limited to sand, clay and loam, and the compactness is greater than or equal to 90%; a hydraulic pressure applying mechanism (1) applied to the soil filling model (2) to simulate the underground pressure, and accurately control and apply a continuous adjustable pressure of 0-20 MPa; an electromagnetic method measuring line system (3) arranged along the pipeline (5) to be tested on the soil filling model (2), which adopts multiple high-precision multi-channel digital acquisition measuring lines arranged at intervals; a metal probe (4) comprising multiple metal probes arranged correspondingly with the electromagnetic method measuring line system (3), which is vertically inserted into the soil filling model (2); a current emitting mechanism (9) electrically connected with the metal probe (4) through a connecting cable respectively; a stable voltage external power supply (10) electrically connected with the current emitting mechanism (9); a magnetic probe array (6) correspondingly distributed on the soil filling model (2); a distributed optical fiber system (11) comprising multiple distributed optical fibers uniformly distributed on the inner wall of the pipeline (5) to be tested; a central signal processor (7) electrically connected with the magnetic probe array (6) and the distributed optical fiber system (11) respectively, and capable of collecting and processing monitoring information data in real time; an analysis and storage terminal (8) electrically connected with the central signal processor (7), which can store, analyze and visually display data information.

2. The optical fiber electromagnetic method fusion probe pipeline leakage deformation monitoring and evaluation system according to claim 1, characterized in that, The spacing between two adjacent measuring lines is adjustable, and the spacing is set to 0.5-2 m; the length of the metal probe (4) is 0.5-3 m.

3. The optical fiber electromagnetic method fusion probe pipeline leakage deformation monitoring and evaluation system according to claim 1, characterized in that, The output current range of the current emitting mechanism (9) is 0-100 A, and the frequency range is 1-10000 Hz; the stable voltage output provided by the stable voltage external power supply (10) is 220V±10%.

4. The optical fiber electromagnetic method fusion probe pipeline leakage deformation monitoring and evaluation system according to claim 1, characterized in that, The measurement accuracy of the magnetic probe array (6) is ±0.01nT; the spatial resolution of the distributed optical fiber system (11) is greater than or equal to 0.1 m, the strain measurement accuracy is greater than or equal to 1με, and the sampling frequency is greater than or equal to 100 Hz.

5. An optical fiber electromagnetic method fusion probe pipeline leak deformation evaluation method, characterized in that, The monitoring and evaluation system of any one of claims 1-4 is adopted, the data information collected by the magnetic probe array (6) and the distributed optical fiber system (11) is transmitted to the central signal processor (7) through a high-speed data bus, the electromagnetic field data and the optical fiber strain data received by the central signal processor (7) are processed in real time, and the pipeline leakage and deformation state are accurately evaluated through the analysis and storage terminal (8); the evaluation method comprises the following steps: Step 1: respectively using the scoring method to evaluate the deformation amount, leakage range, leakage duration and temperature of the pipeline (5) to be tested, The deformation amount score S1, the leakage range score S2, the leakage duration score S3 and the temperature score S4 are obtained respectively by line parameter scoring; Step 2: calculating the total score S of the pipeline safety state S=0.35 S1+0.3 S2+0.2 S3+0.1 S4; Step 3: determining the safety state of the pipeline (5) to be tested according to the total score S obtained, and making corresponding processing strategy.

6. The method of claim 5, wherein the method further comprises: The specific scoring method of the deformation amount of the pipeline (5) to be tested in step 1 is as follows: deformation amount ≤3mm, score 20; deformation amount 3~8mm, score 40; deformation amount 8~12mm, score 60; deformation amount 12~15mm, score 80; deformation amount >15mm, score 100.

7. The method of claim 5, wherein the method further comprises: The specific scoring method of the leakage range of the pipeline (5) to be tested in step 1 is as follows: Leakage range < 0.2 m 2 , with a score of 20; leakage range 0.2~0.5mm, score 40; leakage range 0.5~1mm, score 60; leakage range 1~2mm, score 80; leakage range >2mm, score 100.

8. The method of claim 5, wherein the method further comprises: The specific scoring method of the leakage duration of the pipeline (5) to be tested in step 1 is as follows: leakage duration ≤12h, score 20; leakage duration 12~48h, score 40; leakage duration 48~120h, score 60; leakage duration 120~240h, score 80; leakage duration >240h, score 100.

9. The method of claim 5, wherein the method further comprises: The specific scoring method of the temperature of the pipeline (5) to be tested in step 1 is as follows: temperature 12~25℃, score 20; temperature 25~35℃, score 40; temperature 35~45℃, score 60; temperature 45~55℃, score 80; temperature >55℃, score 100.

10. The method of claim 5, wherein the method further comprises: The specific evaluation method of the safety state of the pipeline (5) to be tested in step 3 is as follows: total score S is 0~40, the pipeline (5) to be tested is in normal state; total score S is 41~60, the pipeline (5) to be tested is prewarned and monitored; total score S is 61~80, the pipeline (5) to be tested is emergently handled; total score S is 81~100, the pipeline (5) to be tested is urgently repaired.

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