A method and device for identifying corrosion leakage risk areas on metal pipelines

Abstract

The present application discloses a method for identifying corrosion leakage risk areas on metal pipelines. In the process of identifying corrosion leakage risk areas on metal pipelines, the method can determine the corrosion leakage risk areas on the target metal pipeline without the need for simultaneous potential measurement on the subway track side, thereby providing technical support for the implementation of economical and effective interference protection measures, reducing the difficulty of identifying corrosion leakage risk areas on metal pipelines, and improving the accuracy of identifying corrosion leakage risk areas on metal pipelines.

Description

Technical Field

[0001] The present application relates to the field of pipeline detection, and in particular to a method and device for identifying corrosion leakage risk areas on metal pipelines. Background Art

[0002] Metro rail transit has the advantages of large carrying capacity, safety, speed, and little influence by climate and other factors. It is one of the main modes of transportation in medium and large cities. Urban subways generally adopt the DC traction power supply mode of running rail return. The traction substation provides the DC power required for train operation, takes the current through the contact network, and returns to the negative pole of the rectifier unit of the traction substation through the running rail, forming a closed loop. In this loop, since the running rail cannot be completely insulated from the ground, and due to factors such as moisture and pollution, the insulation performance of the track gradually decreases with the extension of operating time, it is inevitable that current will leak from the running rail into the ground during the operation of the rail transit system to form stray current, causing interference to surrounding buried oil and gas pipelines and other metal components. As the train continues to run, the distribution of stray current changes with time, and the inflow and outflow of stray current on the buried metal pipeline causes its protection potential to fluctuate. Therefore, the dynamic fluctuation characteristics become the typical characteristics of subway stray current interference with oil and gas pipelines. Generally, the anodic dissolution reaction of the metal occurs at the outflow point of the stray current, and the buried pipeline will corrode. When the interference is serious, corrosion leakage accidents are prone to occur, causing great economic losses and negative social impacts. Therefore, how to determine the concentrated outflow area of ​​the stray current on the pipeline (that is, the high corrosion leakage risk area) to alleviate the interference of the subway stray current is of great significance to ensure the safe operation of the pipeline. The measurement of the rail-to-ground potential requires the installation of corresponding test equipment on the subway track side. Since a complete linkage mechanism has not been established between the pipeline system and the rail transit system, it is difficult for the pipeline testers to carry out the measurement of the rail-to-ground potential. Therefore, there is an urgent need for a method to identify the corrosion leakage risk area on the metal pipeline. Summary of the invention

[0003] The present application provides a method and device for identifying corrosion leakage risk areas on metal pipes, so that in the process of identifying corrosion leakage risk areas on metal pipes, the corrosion leakage risk areas on the target metal pipes can be determined without the need to simultaneously measure the potential on the subway track side, thereby providing technical support for the implementation of economical and effective interference protection measures, reducing the difficulty of identifying corrosion leakage risk areas on metal pipes, and improving the accuracy of identifying corrosion leakage risk areas on metal pipes.

[0004] In a first aspect, the present application provides a method for identifying a corrosion leakage risk area on a metal pipeline, the method comprising:

[0005] Determine a plurality of metal test pieces corresponding to the target metal pipeline; wherein the plurality of metal test pieces are electrically connected to the target metal pipeline, and the positions corresponding to each metal test piece and the target metal pipeline are different;

[0006] For each metal test piece, determine the current reference value corresponding to the metal test piece according to the current value of the metal test piece in a preset type time period; determine the outflow current time integral and the inflow current time integral corresponding to the metal test piece according to the current value of the metal test piece at each target moment in the preset type time period and the current reference value corresponding to the metal test piece; determine the position type of the corresponding position of the metal test piece according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece;

[0007] The corrosion leakage risk area on the target metal pipeline is determined according to the position types of the positions respectively corresponding to the multiple metal test pieces.

[0008] In a second aspect, the present application provides a device for identifying corrosion leakage risk areas on a metal pipeline, the device comprising:

[0009] A first determining unit is used to determine a plurality of metal test pieces corresponding to a target metal pipeline; wherein the plurality of metal test pieces are electrically connected to the target metal pipeline, and the positions corresponding to each metal test piece and the target metal pipeline are different;

[0010] A second determination unit is used to determine, for each metal test piece, a current reference value corresponding to the metal test piece according to the current value of the metal test piece in a preset type time period; determine an outflow current time integral and an inflow current time integral corresponding to the metal test piece according to the current value of the metal test piece at each target moment in the preset type time period and the current reference value corresponding to the metal test piece; determine a position type corresponding to a position of the metal test piece according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece;

[0011] The third determining unit is used to determine the corrosion leakage risk area on the target metal pipeline according to the position types of the positions respectively corresponding to the multiple metal test pieces.

[0012] In a third aspect, the present application provides a readable medium comprising execution instructions. When a processor of an electronic device executes the execution instructions, the electronic device executes any method described in the first aspect.

[0013] In a fourth aspect, the present application provides an electronic device, comprising a processor and a memory storing execution instructions, wherein when the processor executes the execution instructions stored in the memory, the processor executes any method described in the first aspect.

[0014] It can be seen from the above technical solution that the present application first determines a plurality of metal test pieces corresponding to the target metal pipeline; wherein the plurality of metal test pieces are electrically connected to the target metal pipeline, and the positions corresponding to each metal test piece and the target metal pipeline are different. For each metal test piece, the current reference value corresponding to the metal test piece is determined according to the current value of the metal test piece within the preset type time period; the outflow current time integral and the inflow current time integral corresponding to the metal test piece are determined according to the current value of the metal test piece at each target moment within the preset type time period and the current reference value corresponding to the metal test piece; the position type of the corresponding position of the metal test piece is determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece. Finally, the corrosion leakage risk area on the target metal pipeline can be determined according to the position type of the positions corresponding to each of the plurality of metal test pieces. It can be seen that in the process of identifying the corrosion leakage risk area on the metal pipe, this embodiment can determine the corrosion leakage risk area on the target metal pipe without the need to simultaneously measure the potential on the subway track side, thereby providing technical support for the implementation of economical and effective interference protection measures, reducing the difficulty of identifying the corrosion leakage risk area on the metal pipe, and improving the identification accuracy of the corrosion leakage risk area on the metal pipe.

[0015] The further effects of the above-mentioned non-conventional preferred manner will be described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the existing technical solutions, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of a flow chart of a method for identifying corrosion leakage risk areas on a metal pipeline in the present application;

[0018] Figure 2 A schematic diagram of the connection between a target metal pipe and a metal test piece in this application;

[0019] Figure 3 A schematic diagram of the current monitoring results of a metal test piece for this application;

[0020] Figure 4 A schematic diagram of an asymmetric coefficient along a pipeline for this application;

[0021] Figure 5 A schematic diagram of the structure of a device for identifying corrosion leakage risk areas on a metal pipeline provided in one embodiment of the present application;

[0022] Figure 6 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] The inventor found that at present, subway rail transit has the advantages of large carrying capacity, safety and speed, and little influence by factors such as climate, and is one of the main modes of transportation in medium and large cities. Urban subways generally adopt a DC traction power supply method with running rail return. The traction substation provides the DC power required for train operation, takes the current through the contact network, and returns to the negative pole of the rectifier unit of the traction substation through the running rail, forming a closed loop. In this loop, since the running rail cannot be completely insulated from the ground, and due to factors such as moisture and pollution, the insulation performance of the track gradually decreases with the extension of operating time, it is inevitable that during the operation of the rail transit system, current will leak from the running rail into the earth to form stray current, causing interference to surrounding buried oil and gas pipelines and other metal components. As the train continues to run, the distribution of stray current changes with time, and the inflow and outflow of stray current on the buried metal pipeline causes its protection potential to fluctuate. Therefore, the dynamic fluctuation characteristics become a typical feature of the interference of subway stray current on oil and gas pipelines. Generally, the anodic dissolution reaction of the metal occurs at the outflow point of the stray current, and the buried pipeline will corrode. When the interference is serious, corrosion leakage accidents are prone to occur, causing great economic losses and negative social impacts. Therefore, how to determine the concentrated outflow area of ​​the stray current on the pipeline (that is, the high corrosion leakage risk area) to alleviate the interference of the subway stray current is of great significance to ensure the safe operation of the pipeline. The measurement of the rail-to-ground potential requires the installation of corresponding test equipment on the subway track side. Since a complete linkage mechanism has not been established between the pipeline system and the rail transit system, it is difficult for the pipeline testers to carry out the measurement of the rail-to-ground potential. Therefore, there is an urgent need for a method to identify the corrosion leakage risk area on the metal pipeline.

[0025] Therefore, the present application provides a method for identifying corrosion leakage risk areas on metal pipelines. Specifically, the method can be performed by first determining a plurality of metal test pieces corresponding to the target metal pipeline; wherein the plurality of metal test pieces are electrically connected to the target metal pipeline, and the positions corresponding to each metal test piece and the target metal pipeline are different. For each metal test piece, the current reference value corresponding to the metal test piece is determined according to the current value of the metal test piece within a preset type time period; the outflow current time integral and the inflow current time integral corresponding to the metal test piece are determined according to the current values ​​of the metal test piece at each target moment within the preset type time period and the current reference value corresponding to the metal test piece; the position type of the corresponding position of the metal test piece is determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece. Finally, the corrosion leakage risk area on the target metal pipeline can be determined according to the position type of the positions corresponding to each of the plurality of metal test pieces. It can be seen that in the process of identifying the corrosion leakage risk area on the metal pipe, this embodiment can determine the corrosion leakage risk area on the target metal pipe without the need to simultaneously measure the potential on the subway track side, thereby providing technical support for the implementation of economical and effective interference protection measures, reducing the difficulty of identifying the corrosion leakage risk area on the metal pipe, and improving the identification accuracy of the corrosion leakage risk area on the metal pipe.

[0026] Various non-limiting implementations of the present application are described in detail below in conjunction with the accompanying drawings.

[0027] See also Figure 1 , shows a method for identifying corrosion leakage risk areas on a metal pipeline in an embodiment of the present application, wherein the method can be fully applied to a terminal device (e.g., a mobile device such as a mobile phone, a notebook, an electronic communication watch, etc.), or can be fully applied to a server, or some steps can be applied to a terminal device and some steps can be applied to a server. In this embodiment, the method may, for example, include the following steps:

[0028] S101: Determine a plurality of metal test pieces corresponding to a target metal pipe.

[0029] Among them, the multiple metal test pieces are all electrically connected to the target metal pipe, and the positions corresponding to each metal test piece and the target metal pipe are different. For example, each metal test piece is spaced 1 meter apart. In one implementation, the metal test piece 3 is set at the test pile 2 along the target metal pipe 1, and the metal test piece 3 is electrically connected to the target metal pipe through the test pile 2. A current data recorder 4 (for example, an ammeter) is set in series in the circuit connected to the metal test piece 3 and the target metal pipe 1. The current data recorder is used to monitor the current value of the stray current flowing into or out of the metal test piece 3. It should be noted that the target metal pipe can be a pipe set around a rail transit system (such as a subway track).

[0030] It can be understood that in this embodiment, a metal test piece simulating a coating defect point is buried along the target metal pipeline to continuously monitor the stray current flowing into and out of the metal test piece for 24 hours. First, a metal test piece is buried at a test pile along the target metal pipeline, the metal test piece is electrically connected to the target metal pipeline through the test pile, and a current data recorder is connected in series in the circuit connecting the metal test piece and the target metal pipeline, and the stray current flowing into and out of the metal test piece is continuously monitored for at least 24 hours.

[0031] For example, eight metal test pieces may be set for the target metal pipe, namely, metal test piece T1, metal test piece T2, metal test piece T3, metal test piece T4, metal test piece T5, metal test piece T6, metal test piece T7, and metal test piece T8, and the positions of the eight metal test pieces corresponding to the target metal pipe are different.

[0032] S102: For each metal test piece, determine the current reference value corresponding to the metal test piece according to the current value of the metal test piece within a preset type time period; determine the outflow current time integral and the inflow current time integral corresponding to the metal test piece according to the current values ​​of the metal test piece at each target moment within the preset type time period and the current reference value corresponding to the metal test piece; determine the position type of the corresponding position of the metal test piece according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece.

[0033] In this embodiment, for each metal test piece, the current reference value corresponding to the metal test piece can be determined based on the current value of the metal test piece within the preset type time period. The preset type time period can be the time period when the rail transit system stops operating, for example, the preset type time period can be the time period when the subway stops operating at night. Specifically, the current value corresponding to each target moment of the metal test piece within the preset type time period can be obtained first. It should be noted that the target moment can be understood as the moment when the current value needs to be collected. For example, the current value is collected once every preset time (for example, 1 second) within the preset type time period, and the moment when the current value is collected is the target moment; then, the average value of the current values ​​corresponding to all target moments within the preset type time period can be determined; then, the average value can be used as the current reference value corresponding to the metal test piece; for example, the current reference value corresponding to the metal test piece can be calculated by the following formula:

[0034]

[0035] Among them, I S I is the current reference value corresponding to the metal test piece, that is, the average value of the current values ​​corresponding to all target moments within the preset type time period; y is the current value corresponding to the yth target moment in the preset type time period, 0<y≤N y ; N y is the total number of current values ​​collected within the preset type time period.

[0036] After determining the current reference value corresponding to the metal test piece, the outflow current time integral and inflow current time integral corresponding to the metal test piece can be determined based on the current values ​​of the metal test piece at each target moment within the preset type time period and the current reference value corresponding to the metal test piece.

[0037] Specifically, the current values ​​of the metal test piece at all target moments within the preset type of time period can be first divided into a first type of current values ​​and a second type of current values; wherein the first type of current values ​​are current values ​​that are greater than the current reference value corresponding to the metal test piece among all target moments, and the second type of current values ​​are current values ​​that are less than the current reference value corresponding to the metal test piece among all target moments.

[0038] Then, the outflow current time integral corresponding to the metal test piece can be determined according to all the first-category current values ​​and the current reference value corresponding to the metal test piece. Specifically, the outflow current average value can be determined according to all the first-category current values ​​and the current reference value corresponding to the metal test piece. For example, the outflow current average value can be calculated by the following formula:

[0039]

[0040] Among them, ΔI d+ is the average outflow current; I S is the current reference value corresponding to the metal test piece; I j is the jth current reference value I greater than the current reference value I corresponding to the metal test piece S The first type of current value; is the number of current values ​​of the first type; N is the total number of current values ​​collected within the preset type time period.

[0041] According to the number of the first type of current values ​​and the number of the current values ​​at all target moments, the outflow current time percentage is determined; for example, the outflow current time percentage can be calculated by the following formula:

[0042]

[0043] Among them, t d+ is the percentage of time when the current flows out; is the number of current values ​​of the first type; N is the total number of current values ​​collected within the preset type time period.

[0044] According to the outflow current average value and the outflow current time percentage, the outflow current time integral corresponding to the metal test piece is determined; for example, the product of the outflow current average value and the outflow current time percentage can be used as the outflow current time integral corresponding to the metal test piece. For example, the outflow current time integral corresponding to the metal test piece can be calculated by the following formula:

[0045] P[I>I s ]=ΔI d+ *t d+

[0046] Among them, ΔId+ is the average value of the outflow current; td+ is the outflow current time percentage; P[I>Is] is the outflow current time integral corresponding to the metal test piece.

[0047] Next, the time integral of the inflow current corresponding to the metal test piece can be determined based on all the second-category current values ​​and the current reference value corresponding to the metal test piece. Specifically, the average inflow current value can be determined based on all the second-category current values ​​and the current reference value corresponding to the metal test piece. For example, the average inflow current value can be calculated using the following formula:

[0048]

[0049] Among them, ΔI d- is the average value of the inflow current; I S is the current reference value corresponding to the metal test piece; I jis the jth current value I that is less than the current reference value corresponding to the metal test piece S The second type of current value; is the number of the second type of current values; N is the total number of current values ​​collected within the preset type time period.

[0050] According to the number of the second type of current values ​​and the number of the current values ​​at all target moments, the inflow current time percentage is determined; for example, the inflow current time percentage can be calculated by the following formula:

[0051]

[0052] Among them, t d- is the percentage of time of inflow current; is the number of the second type of current values; N is the total number of current values ​​collected within the preset type time period.

[0053] According to the inflow current average value and the inflow current time percentage, the inflow current time integral corresponding to the metal test piece is determined; for example, the product of the inflow current average value and the inflow current time percentage can be used as the inflow current time integral corresponding to the metal test piece. For example, the inflow current time integral corresponding to the metal test piece can be calculated by the following formula:

[0054] P[I<I s ]=ΔI d- *t d-

[0055] Among them, ΔI d- is the average value of the inflow current; t d- is the percentage of time of inflow current; P[I<I s ] is the time integral of the inflow current corresponding to the metal specimen.

[0056] After determining the outflow current time integral and the inflow current time integral corresponding to the metal test piece, the position type of the corresponding position of the metal test piece can be determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece.

[0057] Specifically, if the outflow current time integral corresponding to the metal test piece is greater than the inflow current time integral corresponding to the metal test piece, the forward asymmetry coefficient is determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece; that is, when the outflow current time integral is greater than the inflow current time integral, that is, P[I>I s ] is greater than P[I<I s ], take the positive asymmetry coefficient, as shown in the following formula:

[0058] Among them, σout is the positive asymmetry coefficient, P[I>I s ] is the time integral of the outflow current corresponding to the metal test piece, P[I<I s ] is the time integral of the inflow current corresponding to the metal test piece. If the forward asymmetry coefficient is greater than the first preset threshold, the position type of the corresponding position of the metal test piece is the first type; if the forward asymmetry coefficient is less than or equal to the first preset threshold, the position type of the corresponding position of the metal test piece is the second type; for example, to evaluate the asymmetry of pipeline stray current interference, when σ out >1.3 (i.e., the first preset threshold is 1.3), it indicates that the test pile tends to be positive asymmetric interference, and the pipeline tends to flow out stray current as a whole. Then, the position type of the corresponding position of the metal test piece is the first type (i.e., outflow of stray current); when 1≤σ out When ≤1.3, it indicates that the test pile tends to be symmetrically interfered, and the stray current flowing into and out of the pipeline is not much different overall. Then the position type of the corresponding position of the metal test piece is the second type (that is, the stray current flowing in and out is not much different).

[0059] If the outflow current time integral corresponding to the metal test piece is smaller than the inflow current time integral corresponding to the metal test piece, the negative asymmetry coefficient is determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece; that is, when the outflow current time integral is smaller than the inflow current time integral, that is, P[I>I s ] is less than P[I<I s ], take the negative asymmetry coefficient, as shown in the following formula:

[0060] Among them, σ in is a negative asymmetry coefficient, P[I>I s ] is the time integral of the outflow current corresponding to the metal test piece, P[I<I s ] is the time integral of the inflow current corresponding to the metal test piece. If the negative asymmetry coefficient is less than the second preset threshold, the position type of the corresponding position of the metal test piece is the third type; if the negative asymmetry coefficient is greater than or equal to the second preset threshold, the position type of the corresponding position of the metal test piece is the second type. When σ in <-1.3 (i.e., the second preset threshold is -1.3), it indicates that the test pile tends to be negative asymmetric interference, and the pipeline tends to flow into stray current as a whole, that is, the position type of the corresponding position of the metal test piece is the third type (i.e., flowing stray current); when -1.3≤σ in When ≤1, it indicates that the test pile tends to be symmetrically interfered, and the stray current flowing into and out of the pipeline is not much different overall, that is, the position type of the corresponding position of the metal test piece is the second type (that is, the stray current flowing in and out is not much different).

[0061] S103: Determine the corrosion leakage risk area on the target metal pipeline according to the position types of the positions respectively corresponding to the multiple metal test pieces.

[0062] Specifically, the risk area can be determined according to the positions corresponding to several metal test pieces of the first type; for example, the positions corresponding to several metal test pieces of the first type can be connected to obtain the risk area. Assuming that the position types of the positions corresponding to the target metal pipelines of metal test pieces T4, metal test pieces T5, metal test pieces T6, metal test pieces T7, and metal test pieces T8 are all of the first type, the area corresponding to the target metal pipelines from metal test pieces T4 to metal test pieces T8 can be taken as the risk area. Then, the pipeline portion corresponding to the risk area on the target metal pipeline can be taken as the corrosion leakage risk area on the target metal pipeline, and the corrosion leakage risk area on the target metal pipeline can be understood as the concentrated outflow area of ​​stray current on the target metal pipeline. That is to say, in this embodiment, the asymmetry coefficients at the test piles along the pipeline can be counted, and the pipe section where the positive asymmetry coefficient is concentrated is the concentrated outflow area of ​​stray current, which is the corrosion leakage risk area on the target metal pipeline.

[0063] The following is an example:

[0064] 1. A metal test piece was buried at a test pile along a pipeline, and the stray current flowing into and out of the test piece was continuously monitored for 24 hours.

[0065] 2. Obtain current monitoring results along the pipeline, such as Figure 3 shown.

[0066] 3. Taking the average value of the current without interference at night as the benchmark, calculate the product of the average value of the outflow current and the time percentage, and the product of the average value of the inflow current and the time percentage. When the time integral of the outflow current is greater than the time integral of the inflow current, take the positive asymmetry coefficient, and use the absolute value of the ratio of the outflow current to the inflow current as the asymmetry coefficient; when the time integral of the inflow current is greater than the time integral of the outflow current, take the negative asymmetry coefficient, and use the negative value of the ratio of the inflow current to the outflow current as the asymmetry coefficient. With such a setting, the positive and negative values ​​represent the positive and negative asymmetry, and the larger the absolute value of the coefficient, the stronger the positive and negative asymmetry.

[0067] 4. Calculate the asymmetry coefficient along the line, such as Figure 4As shown in the figure, it can be found that the pipe section with concentrated positive asymmetry coefficient is located between test piles T4#~T8#. When disturbed by subway stray current, this section of pipeline tends to have more outflow current and has a greater corrosion risk. Therefore, the area corresponding to test piles T4#~T8# is taken as the corrosion leakage risk area on the target metal pipeline.

[0068] It can be seen from the above technical solution that the present application first determines a plurality of metal test pieces corresponding to the target metal pipeline; wherein the plurality of metal test pieces are electrically connected to the target metal pipeline, and the positions corresponding to each metal test piece and the target metal pipeline are different. For each metal test piece, the current reference value corresponding to the metal test piece is determined according to the current value of the metal test piece within the preset type time period; the outflow current time integral and the inflow current time integral corresponding to the metal test piece are determined according to the current value of the metal test piece at each target moment within the preset type time period and the current reference value corresponding to the metal test piece; the position type of the corresponding position of the metal test piece is determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece. Finally, the corrosion leakage risk area on the target metal pipeline can be determined according to the position type of the positions corresponding to each of the plurality of metal test pieces. It can be seen that in the process of identifying the corrosion leakage risk area on the metal pipeline, the present embodiment can determine the corrosion leakage risk area on the target metal pipeline without the need to simultaneously measure the potential on the subway track side, thereby providing technical support for the implementation of economical and effective interference protection measures, reducing the difficulty of identifying the corrosion leakage risk area on the metal pipeline, and improving the accuracy of identifying the corrosion leakage risk area on the metal pipeline. In other words, the method provided by the present application continuously monitors the stray current flowing into and out of the test piece for 24 hours by burying test pieces simulating coating defect points along the pipeline, and taking the current amount in the interference-free time period at night as the benchmark, the positive and negative asymmetry coefficients during the operation of the subway system during the day are counted, and the pipe section with concentrated positive asymmetry coefficients is the concentrated outflow area of ​​stray current, and the determination of high corrosion leakage risk areas on the pipeline provides technical support for the implementation of economical and effective interference protection measures. The method fully considers the characteristics of subway stray current inflow and outflow, eliminates the background (baseline) current value of the pipeline itself, introduces the concept of positive and negative asymmetric coefficients and sets the risk level judgment threshold, so that the evaluation of the severity of stray current interference is more systematic, comprehensive and accurate. At the same time, the invention also provides a method for identifying high corrosion leakage risk areas for stray current interference protection measures. The method solves the error caused by the current use of potential parameters for judgment. The current parameter can more accurately represent the size of the subway interference source. By monitoring and counting the inflow and outflow current of the test piece, the asymmetric coefficient is counted and the corresponding threshold is proposed to evaluate the stray current high corrosion leakage risk area. The method avoids the problem of low accuracy in determining the actual size of the subway interference source by the original cathodic protection or drainage system of the pipeline. Under normal circumstances, the interference risk is evaluated by monitoring and counting the pipeline potential, and the interference risk level is defaulted to the size of the interference source. However, the pipeline potential value is often affected by multiple factors such as stray current interference, cathodic protection, soil, etc., and its risk level cannot represent the interference source alone.The present invention eliminates the background (baseline) current value, retains the current generated by the interference through calculation and sets a threshold value, and more accurately represents the size of the interference source. The method avoids the cumbersome process and high cost problems caused by coordinating with the subway to install monitoring equipment. The method does not add new tasks and investment in monitoring technology; at the same time, it does not require the cooperation of the subway to complete the indirect judgment of the size of the interference source, and can clarify the concentrated outflow area and risk level of the stray current on the pipeline, providing technical support for the implementation of economical and effective interference protection measures.

[0069] like Figure 5 As shown, it is a specific embodiment of a device for identifying a corrosion leakage risk area on a metal pipeline described in the present application. The device described in this embodiment is a physical device for executing the method described in the above embodiment. Its technical solution is essentially consistent with the above embodiment, and the corresponding description in the above embodiment is also applicable to this embodiment. The device described in this embodiment includes:

[0070] A first determining unit 501 is used to determine a plurality of metal test pieces corresponding to a target metal pipe; wherein the plurality of metal test pieces are electrically connected to the target metal pipe, and the positions corresponding to each metal test piece and the target metal pipe are different;

[0071] The second determination unit 502 is used to determine, for each metal test piece, a current reference value corresponding to the metal test piece according to the current value of the metal test piece in a preset type time period; determine the outflow current time integral and the inflow current time integral corresponding to the metal test piece according to the current value of the metal test piece at each target moment in the preset type time period and the current reference value corresponding to the metal test piece; determine the position type of the corresponding position of the metal test piece according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece;

[0072] The third determining unit 503 is used to determine the corrosion leakage risk area on the target metal pipeline according to the position types of the positions respectively corresponding to the multiple metal test pieces.

[0073] Optionally, the metal test piece is set at a test pile along the target metal pipeline, the metal test piece is electrically connected to the target metal pipeline through the test pile, and a current data recorder is set in series in the circuit connected to the metal test piece and the target metal pipeline, and the current data recorder is used to monitor the current value of stray current flowing into or out of the metal test piece.

[0074] Optionally, the target metal pipe is a pipe arranged around a rail transit system, and the preset type time period is a time period during which the rail transit system stops operating; the second determining unit 502 is used to:

[0075] Obtaining the current value of the metal test piece corresponding to each target time within the preset type time period;

[0076] Determine the average value of the current values ​​corresponding to all target moments within the preset type time period;

[0077] The average value is used as the current reference value corresponding to the metal test piece.

[0078] Optionally, the second determining unit 502 is configured to:

[0079] Divide the current values ​​of the metal test piece at all target moments within the preset type time period into a first type of current value and a second type of current value; wherein the first type of current value is a current value greater than a current reference value corresponding to the metal test piece among all the current values ​​at the target moments, and the second type of current value is a current value less than the current reference value corresponding to the metal test piece among all the current values ​​at the target moments;

[0080] Determine the outflow current time integral corresponding to the metal test piece according to all first-category current values ​​and the current reference value corresponding to the metal test piece;

[0081] The time integral of the inflow current corresponding to the metal test piece is determined according to all the second-category current values ​​and the current reference value corresponding to the metal test piece.

[0082] Optionally, the second determining unit 502 is configured to:

[0083] Determine the outflow current average value according to all first-category current values ​​and the current reference value corresponding to the metal test piece;

[0084] Determining the outflow current time percentage according to the number of the first type of current values ​​and the number of the current values ​​at all target moments;

[0085] The outflow current time integral corresponding to the metal test piece is determined according to the outflow current average value and the outflow current time percentage.

[0086] Optionally, the second determining unit 502 is configured to:

[0087] Determine an average value of the inflow current according to all the second-category current values ​​and the current reference value corresponding to the metal test piece;

[0088] Determining the inflow current time percentage according to the number of the second type current values ​​and the number of the current values ​​at all target moments;

[0089] The inflow current time integral corresponding to the metal test piece is determined according to the inflow current average value and the inflow current time percentage.

[0090] Optionally, the second determining unit 502 is configured to:

[0091] If the outflow current time integral corresponding to the metal test piece is greater than the inflow current time integral corresponding to the metal test piece, the forward asymmetry coefficient is determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece; if the forward asymmetry coefficient is greater than a first preset threshold, the position type of the corresponding position of the metal test piece is the first type; if the forward asymmetry coefficient is less than or equal to the first preset threshold, the position type of the corresponding position of the metal test piece is the second type;

[0092] If the outflow current time integral corresponding to the metal test piece is smaller than the inflow current time integral corresponding to the metal test piece, the negative asymmetry coefficient is determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece; if the negative asymmetry coefficient is smaller than the second preset threshold, the position type of the corresponding position of the metal test piece is the third type; if the negative asymmetry coefficient is greater than or equal to the second preset threshold, the position type of the corresponding position of the metal test piece is the second type.

[0093] Optionally, the third determining unit 503 is used to

[0094] Determine the risk area according to the positions corresponding to a number of metal test pieces whose position type is the first type;

[0095] The pipeline portion on the target metal pipeline corresponding to the risk area is used as the corrosion leakage risk area on the target metal pipeline.

[0096] It can be seen that in the process of identifying the corrosion leakage risk area on the metal pipe, the device can determine the corrosion leakage risk area on the target metal pipe without the need to simultaneously measure the potential on the subway track side, thereby providing technical support for the implementation of economical and effective interference protection measures, reducing the difficulty of identifying the corrosion leakage risk area on the metal pipe, and improving the identification accuracy of the corrosion leakage risk area on the metal pipe.

[0097] Figure 6 It is a structural diagram of an electronic device provided in an embodiment of the present application. At the hardware level, the electronic device includes a processor, and optionally also includes an internal bus, a network interface, and a memory. Among them, the memory may include a memory, such as a high-speed random access memory (Random-Access Memory, RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk storage, etc. Of course, the electronic device may also include hardware required for other services.

[0098] The processor, network interface and memory can be interconnected through an internal bus, which can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0099] The memory is used to store execution instructions. Specifically, the execution instructions are computer programs that can be executed. The memory may include internal memory and non-volatile memory, and provides execution instructions and data to the processor.

[0100] In one possible implementation, the processor reads the corresponding execution instructions from the non-volatile memory into the memory and then runs them, and can also obtain the corresponding execution instructions from other devices to form a device for identifying the corrosion leakage risk area on the metal pipeline at the logical level. The processor executes the execution instructions stored in the memory to implement the method for identifying the corrosion leakage risk area on the metal pipeline provided in any embodiment of the present application through the executed execution instructions.

[0101] The above application Figure 1The method performed by the device for identifying the corrosion leakage risk area on the metal pipeline provided in the illustrated embodiment can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software. The above processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The various methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0102] The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0103] An embodiment of the present application also proposes a readable storage medium, which stores execution instructions. When the stored execution instructions are executed by a processor of an electronic device, the electronic device can execute the method for identifying corrosion leakage risk areas on metal pipes provided in any embodiment of the present application, and is specifically used to execute the above-mentioned method for identifying corrosion leakage risk areas on metal pipes.

[0104] The electronic device described in the above embodiments may be a computer.

[0105] Those skilled in the art should understand that the embodiments of the present application can be provided as methods or computer program products. Therefore, the present application can adopt a complete hardware embodiment, a complete software embodiment, or a combination of software and hardware.

[0106] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0107] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0108] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for identifying corrosion leakage risk areas on metal pipelines, characterized in that: The method comprises: Determine a plurality of metal test pieces corresponding to the target metal pipeline; wherein the plurality of metal test pieces are electrically connected to the target metal pipeline, and the positions corresponding to each metal test piece and the target metal pipeline are different; For each metal test piece, determine the current reference value corresponding to the metal test piece according to the current value of the metal test piece in a preset type time period; determine the outflow current time integral and the inflow current time integral corresponding to the metal test piece according to the current value of the metal test piece at each target moment in the preset type time period and the current reference value corresponding to the metal test piece; determine the position type of the corresponding position of the metal test piece according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece; Determining the corrosion leakage risk area on the target metal pipeline according to the position types of the positions respectively corresponding to the multiple metal test pieces; The method of determining the outflow current time integral and the inflow current time integral corresponding to the metal test piece according to the current value of the metal test piece at each target moment in the preset type time period and the current reference value corresponding to the metal test piece comprises: Divide the current values ​​of the metal test piece at all target moments within the preset type time period into a first type of current value and a second type of current value; wherein the first type of current value is a current value greater than a current reference value corresponding to the metal test piece among all the current values ​​at the target moments, and the second type of current value is a current value less than the current reference value corresponding to the metal test piece among all the current values ​​at the target moments; Determine the outflow current time integral corresponding to the metal test piece according to all first-category current values ​​and the current reference value corresponding to the metal test piece; Determine the time integral of the inflow current corresponding to the metal test piece according to all the second-category current values ​​and the current reference value corresponding to the metal test piece; The step of determining the outflow current time integral corresponding to the metal test piece according to all the first-category current values ​​and the current reference value corresponding to the metal test piece comprises: Determine the outflow current average value according to all first-category current values ​​and the current reference value corresponding to the metal test piece; Determining the outflow current time percentage according to the number of the first type of current values ​​and the number of the current values ​​at all target moments; The outflow current time integral corresponding to the metal test piece is determined according to the outflow current average value and the outflow current time percentage.

2. The method according to claim 1, characterized in that The metal test piece is set at a test pile along the target metal pipeline. The metal test piece is electrically connected to the target metal pipeline through the test pile. A current data recorder is set in series in the circuit connected by the metal test piece and the target metal pipeline. The current data recorder is used to monitor the current value of the stray current flowing into or out of the metal test piece.

3. The method according to claim 1, characterized in that The target metal pipe is a pipe arranged around the rail transit system, and the preset type time period is a time period during which the rail transit system stops operating; and determining the current reference value corresponding to the metal test piece according to the current value of the metal test piece in the preset type time period includes: Obtaining the current value of the metal test piece corresponding to each target time within the preset type time period; Determine the average value of the current values ​​corresponding to all target moments within the preset type time period; The average value is used as the current reference value corresponding to the metal test piece.

4. The method according to claim 1, characterized in that: The step of determining the time integral of the inflow current corresponding to the metal test piece according to all the second-category current values ​​and the current reference value corresponding to the metal test piece comprises: Determine an average value of the inflow current according to all the second-category current values ​​and the current reference value corresponding to the metal test piece; Determining the inflow current time percentage according to the number of the second type current values ​​and the number of the current values ​​at all target moments; The inflow current time integral corresponding to the metal test piece is determined according to the inflow current average value and the inflow current time percentage.

5. The method according to claim 1, characterized in that The determining the position type of the position corresponding to the metal test piece according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece includes: If the outflow current time integral corresponding to the metal test piece is greater than the inflow current time integral corresponding to the metal test piece, the forward asymmetry coefficient is determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece; if the forward asymmetry coefficient is greater than a first preset threshold, the position type of the corresponding position of the metal test piece is the first type; if the forward asymmetry coefficient is less than or equal to the first preset threshold, the position type of the corresponding position of the metal test piece is the second type; If the outflow current time integral corresponding to the metal test piece is smaller than the inflow current time integral corresponding to the metal test piece, the negative asymmetry coefficient is determined according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece; if the negative asymmetry coefficient is smaller than the second preset threshold, the position type of the corresponding position of the metal test piece is the third type; if the negative asymmetry coefficient is greater than or equal to the second preset threshold, the position type of the corresponding position of the metal test piece is the second type.

6. The method according to claim 5, characterized in that The step of determining the corrosion leakage risk area on the target metal pipeline according to the position types of the positions respectively corresponding to the plurality of metal test pieces includes: Determine the risk area according to the positions corresponding to a number of metal test pieces whose position type is the first type; The pipeline portion on the target metal pipeline corresponding to the risk area is used as the corrosion leakage risk area on the target metal pipeline.

7. A device for identifying corrosion leakage risk areas on a metal pipeline, characterized in that: The device comprises: A first determining unit is used to determine a plurality of metal test pieces corresponding to a target metal pipeline; wherein the plurality of metal test pieces are electrically connected to the target metal pipeline, and the positions corresponding to each metal test piece and the target metal pipeline are different; A second determination unit is used to determine, for each metal test piece, a current reference value corresponding to the metal test piece according to the current value of the metal test piece in a preset type time period; determine an outflow current time integral and an inflow current time integral corresponding to the metal test piece according to the current value of the metal test piece at each target moment in the preset type time period and the current reference value corresponding to the metal test piece; determine a position type corresponding to a position of the metal test piece according to the outflow current time integral and the inflow current time integral corresponding to the metal test piece; A third determining unit, configured to determine the corrosion leakage risk area on the target metal pipeline according to the position types of the positions respectively corresponding to the plurality of metal test pieces; The method of determining the outflow current time integral and the inflow current time integral corresponding to the metal test piece according to the current value of the metal test piece at each target moment in the preset type time period and the current reference value corresponding to the metal test piece comprises: Divide the current values ​​of the metal test piece at all target moments within the preset type time period into a first type of current value and a second type of current value; wherein the first type of current value is a current value greater than a current reference value corresponding to the metal test piece among all the current values ​​at the target moments, and the second type of current value is a current value less than the current reference value corresponding to the metal test piece among all the current values ​​at the target moments; Determine the outflow current time integral corresponding to the metal test piece according to all first-category current values ​​and the current reference value corresponding to the metal test piece; Determine the time integral of the inflow current corresponding to the metal test piece according to all the second-category current values ​​and the current reference value corresponding to the metal test piece; The step of determining the outflow current time integral corresponding to the metal test piece according to all the first-category current values ​​and the current reference value corresponding to the metal test piece comprises: Determine the outflow current average value according to all first-category current values ​​and the current reference value corresponding to the metal test piece; Determining the outflow current time percentage according to the number of the first type of current values ​​and the number of the current values ​​at all target moments; The outflow current time integral corresponding to the metal test piece is determined according to the outflow current average value and the outflow current time percentage.

8. An electronic device, characterized in that: The electronic device includes a processor and a memory storing execution instructions. When the processor executes the execution instructions stored in the memory, the processor executes the method according to any one of claims 1 to 6.

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