Method, system and device for dynamically adjusting cathode protection potential

Abstract

The invention provides a cathode protection potential dynamic adjustment method, system and device, and the method comprises the following steps: obtaining a tube ground potential signal, and obtaining a stray current value; the pipe-to-ground potential signal is loaded to a pH sensor, and the pH value of the pipeline corrosion interface under the stray current effect is obtained in situ through the pH sensor; establishing a relation function between the stray current and the corrosion rate according to the stray current value and the pH value of the pipeline corrosion interface; calculating the corrosion rate according to the relation function between the stray current and the corrosion rate; and optimizing the cathode protection potential according to the corrosion rate. According to the technical scheme, the relation function between the stray current and the corrosion rate is established based on the in-situ pH analysis method, then the adjustment scheme of the cathode protection potential is determined, and optimization of the cathode protection potential under stray current interference is achieved.

Description

Background Art

[0002] Due to the rapid development of electrified railways and high-voltage transmission lines, it has become a common phenomenon that high-voltage transmission lines, rail transit lines and pipelines are laid parallel or crosswise in public corridors, resulting in an increasing risk of pipelines being disturbed by stray currents. Although a large number of theoretical and experimental studies have been conducted on corrosion caused by stray current interference, and the causes, conduction mechanisms and influence laws of stray current interference have been mastered to a certain extent, due to the complex interference types, frequent fluctuations throughout the year and unstable characteristic parameters of stray currents, there are still many difficulties in the mitigation and control of stray current corrosion in actual engineering applications. Existing research results show that the superposition of cathodic protection current and AC stray current will aggravate the corrosion problem (Corrosion Science, 2022, 197: 110085.), and studies have also shown that the use of high cathodic protection levels in the presence of AC interference may not meet the corrosion protection requirements in actual operation.

[0003] Drainage facilities have a certain mitigating effect on stray current corrosion. However, how to effectively evaluate the cathodic protection effect and avoid the problem of accelerated corrosion under the combined action of AC stray current and cathodic protection current is a difficult problem. Therefore, under the condition of stray current interference, the output parameters and control potential of the constant potential instrument should be dynamically adjusted with the change of interference level to ensure that the cathodic protection potential of the pipeline is within a reasonable range. In the optimization process, clarifying the in-situ chemical environment of the corrosion interface is the key to adjusting the cathodic protection potential. It is necessary to effectively determine the corrosion state by designing an in-situ analysis device for the interface chemical environment under stray current interference.

[0004] Patent application number 202410165024.6 discloses a system and method for predictive adjustment of cathodic protection potential, which uses a cathodic protection server, and an intelligent cathodic protection pile and a constant potentiostat connected to the cathodic protection server, to predictively adjust the cathodic protection potential using a potential distribution function and an algorithm, and optimize the cathodic protection potential. However, this method is only based on the potential analysis results and cannot truly reflect the electrochemical corrosion characteristics under stray current interference. The effectiveness of its adjustment algorithm is unclear, and it is impossible to obtain the actual change in the corrosion rate of the pipeline after adjustment; Patent application number 202110005 Patent No. 498.0 discloses a method and device for determining the cathodic protection potential of a pipeline, which obtains the target correction parameters by obtaining the pipe-to-ground potential signal and the ground potential gradient signal of the pipeline within a target time period, and further obtains the pipeline cathodic protection potential based on the target correction parameters, the pipe-to-ground potential signal and the ground potential gradient signal, and then determines the cathodic protection potential of the pipeline in the dynamic stray current interference section to achieve effective operation of cathodic protection. However, the above method can only obtain the pipeline cathodic protection potential with high accuracy, and cannot evaluate the corrosion characteristics under the combined action of stray current and cathodic protection current and the safe operation level of the pipeline. Summary of the invention

[0005] The present application provides a method, system and device for dynamically adjusting the cathodic protection potential, so as to optimize the cathodic protection potential under the interference of stray current.

[0006] In a first aspect, a method for dynamically adjusting a cathodic protection potential is provided, comprising the following steps:

[0007] Obtain the pipe-to-ground potential signal and obtain the stray current value;

[0008] The pipe-to-ground potential signal is loaded into a pH sensor, and the pH value of the pipeline corrosion interface under the action of stray current is obtained in situ through the pH sensor;

[0009] Establishing a relationship function between stray current and corrosion rate according to the stray current value and the pH value of the pipeline corrosion interface;

[0010] Calculating the corrosion rate according to the relationship function between the stray current and the corrosion rate;

[0011] According to the corrosion rate, the cathodic protection potential is optimized, and the optimized pipeline cathodic protection potential is output.

[0012] In the above technical scheme, the stray current value is obtained by acquiring the pipe-to-ground potential signal; the pipe-to-ground potential signal is loaded into a pH sensor, and the pH value of the pipeline corrosion interface under the action of the stray current is obtained in situ through the pH sensor; according to the stray current value and the pH value of the pipeline corrosion interface, a relationship function between the stray current and the corrosion rate is established; according to the relationship function between the stray current and the corrosion rate, the corrosion rate is calculated; according to the corrosion rate, the cathodic protection potential is optimized, and the optimized pipeline cathodic protection potential is output; based on the in-situ pH analysis method, a relationship function between the stray current, the cathodic protection current and the corrosion rate is established, and then the adjustment plan of the cathodic protection potential is clarified, and the optimization of the cathodic protection potential under the interference of the stray current is realized.

[0013] In a specific embodiment, the relationship function between the stray current and the corrosion rate is:

[0014] lgv corr =v blank +k1×lg(pH 土壤 )-k2×(pH 信号 -pH 土壤 );

[0015] Among them, v corr represents the pipeline corrosion rate under the interference of stray current; v blank Represents the natural corrosion rate of the pipeline when there is no stray current; pH 土壤 and pH 信号 Represent the pH values ​​of soil and signal electrode respectively, k1 and k2 represent the weight coefficients of interface and soil pH on corrosion; lg represents the logarithm.

[0016] In a specific implementation scheme, under the interference of stray current, the conversion relationship between the cathodic protection potential and the pH value of the pipeline metal interface is:

[0017]

[0018] Among them, U max and V cp They represent the highest tube-to-ground voltage of stray current and the cathodic protection potential, α(E) represents the hydrogen ion diffusion coefficient, k represents the correlation coefficient, and pH 感应 Corresponding to the pipe interface pH.

[0019] In a specific embodiment, the pH sensor comprises a disk electrode and a ring electrode surrounding the disk electrode, wherein:

[0020] The disk electrode serves as a stray current and cathodic protection current channel and a signal probe for in-situ simulation of the pipeline interface under stray current interference;

[0021] The ring electrode is used as a pH response probe to collect the interface pH for in-situ analysis.

[0022] In a specific embodiment, the functional expression of the pH response value is:

[0023] pH 感应 =a×(E oc + b);

[0024]

[0025] Where a and b are linearly fitted to the open circuit potential E of the response probe. oc The relationship curve with pH standard solution is obtained; and are the H in the response probe and the signal probe, respectively. + Ion concentration, and OH in the response probe and signal probe, respectively. - Ion concentration, and are the pH value of soil electrolyte, N D is the collection coefficient of the signal probe.

[0026] In a second aspect, a cathodic protection potential dynamic adjustment system is provided, comprising:

[0027] The stray current acquisition module is used to obtain the pipe-to-ground potential signal and obtain the stray current value;

[0028] A pH in-situ analysis module is used to load the pipe-to-ground potential signal into a pH sensor, and obtain the pH value of the pipeline corrosion interface under the action of stray current in situ through the pH sensor; and establish a relationship function between stray current and corrosion rate according to the stray current value and the pH value of the pipeline corrosion interface;

[0029] A cathodic protection potential analysis module, used to calculate the corrosion rate according to the relationship function between the stray current and the corrosion rate; and to optimize the cathodic protection potential according to the corrosion rate;

[0030] The output module is used to output the optimized pipeline cathodic protection potential.

[0031] In the above technical scheme, the stray current value is obtained by acquiring the pipe-to-ground potential signal; the pipe-to-ground potential signal is loaded into a pH sensor, and the pH value of the pipeline corrosion interface under the action of the stray current is obtained in situ through the pH sensor; according to the stray current value and the pH value of the pipeline corrosion interface, a relationship function between the stray current and the corrosion rate is established; according to the relationship function between the stray current and the corrosion rate, the corrosion rate is calculated; according to the corrosion rate, the cathodic protection potential is optimized, and the optimized pipeline cathodic protection potential is output; based on the in-situ pH analysis method, a relationship function between the stray current, the cathodic protection current and the corrosion rate is established, and then the adjustment plan of the cathodic protection potential is clarified, and the optimization of the cathodic protection potential under the interference of the stray current is realized.

[0032] In a third aspect, a pipeline protection device is provided, including the cathodic protection potential dynamic adjustment system.

[0033] In a specific implementation scheme, it also includes: a pipeline potential monitor, an inductive pH sensor, an intelligent cathode protection pile and a constant potential meter, and the output module is electrically connected to the constant potential meter, wherein:

[0034] The pipeline potential monitor is used to collect the pipeline-to-ground potential signal;

[0035] The inductive pH sensor is used to analyze the pH characteristics of the pipeline interface under the combined action of stray current and cathodic protection current, and to analyze and determine the adjustment of the cathodic protection potential based on the analysis results;

[0036] The intelligent cathodic protection pile is used to collect potential data and potential output commands, and dynamically adjust the cathodic protection potential according to the signal of the inductive pH sensor;

[0037] The constant potentiostat is used to receive the potential output command of the intelligent cathodic protection pile and adjust the output potential according to the potential output command.

[0038] In the above technical scheme, the stray current value is obtained by acquiring the pipe-to-ground potential signal; the pipe-to-ground potential signal is loaded into a pH sensor, and the pH value of the pipeline corrosion interface under the action of the stray current is obtained in situ through the pH sensor; according to the stray current value and the pH value of the pipeline corrosion interface, a relationship function between the stray current and the corrosion rate is established; according to the relationship function between the stray current and the corrosion rate, the corrosion rate is calculated; according to the corrosion rate, the cathodic protection potential is optimized, and the optimized pipeline cathodic protection potential is output; based on the in-situ pH analysis method, a relationship function between the stray current, the cathodic protection current and the corrosion rate is established, and then the adjustment plan of the cathodic protection potential is clarified, and the optimization of the cathodic protection potential under the interference of the stray current is realized.

[0039] In a specific implementation scheme, the inductive pH sensor is electrically connected to the pipeline potential monitor, the intelligent cathodic protection pile is electrically connected to the pipeline potential monitor, and the intelligent cathodic protection pile is electrically connected to the constant potentiostat; the inductive pH sensor is used to be directly electrically connected to the pipeline.

[0040] In a specific implementation manner, the inductive pH sensor is also used to verify pH change data under the output potential value of the intelligent cathodic protection pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A flowchart of a method for dynamically adjusting the cathodic protection potential provided in an embodiment of the present application;

[0042] Figure 2 A structural block diagram of a cathodic protection potential dynamic adjustment system provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure of an inductive pH sensor provided in an embodiment of the present application;

[0044] Figure 4 A schematic diagram of the testing principle of the inductive pH sensor provided in an embodiment of the present application;

[0045] Figure 5 A schematic diagram of the structure of a pipeline protection device provided in an embodiment of the present application;

[0046] Figure 6 This is a structural block diagram of the pipeline protection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0048] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0049] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0050] To facilitate understanding of the cathodic protection potential dynamic adjustment method, system and device provided in the embodiment of the present application, its application scenario is first explained. The cathodic protection potential dynamic adjustment method, system and device provided in the embodiment of the present application are used to optimize the cathodic protection potential under stray current interference. Drainage facilities have a certain mitigation effect on stray current corrosion, but how to effectively evaluate the cathodic protection effect and avoid the problem of accelerated corrosion under the combined action of AC stray current and cathodic protection current is a difficulty. Therefore, under the condition of stray current interference, the output parameters and control potential of the constant potential instrument should be dynamically regulated with the change of interference level, so as to ensure that the cathodic protection potential of the pipeline is within a reasonable range. In the optimization process, clarifying the in-situ chemical environment of the corrosion interface is the key to adjusting the cathodic protection potential, and it is necessary to effectively determine the corrosion state by designing an in-situ analysis device of the interface chemical environment under stray current interference. For this reason, the embodiment of the present application provides a method, system and device for dynamic adjustment of cathodic protection potential to optimize the cathodic protection potential under stray current interference. The following is a detailed description of the embodiment in conjunction with the specific drawings.

[0051] refer to Figures 1 to 6 , Figure 1 A flowchart of a method for dynamically adjusting the cathodic protection potential provided in an embodiment of the present application; Figure 2 A structural block diagram of a cathodic protection potential dynamic adjustment system provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of an inductive pH sensor provided in an embodiment of the present application; Figure 4 A schematic diagram of the testing principle of the inductive pH sensor provided in an embodiment of the present application; Figure 5 A schematic diagram of the structure of a pipeline protection device provided in an embodiment of the present application; Figure 6 This is a structural block diagram of the pipeline protection device provided in an embodiment of the present application.

[0052] exist Figure 1 In the embodiment of the present application, a method for dynamically adjusting the cathodic protection potential is provided, comprising the following steps:

[0053] Obtain the pipe-to-ground potential signal to obtain the stray current value; wherein the pipe-to-ground potential signal is the current and potential signal of the pipeline and the soil electrolyte, including a direct current signal and an alternating current signal;

[0054] The pipe-to-ground potential signal is loaded into a pH sensor, and the pH value of the pipeline corrosion interface under the action of stray current is obtained in situ through the pH sensor;

[0055] Establishing a relationship function between stray current and corrosion rate according to the stray current value and the pH value of the pipeline corrosion interface;

[0056] Calculating the corrosion rate according to the relationship function between the stray current and the corrosion rate;

[0057] According to the corrosion rate, the cathodic protection potential is optimized, and the optimized pipeline cathodic protection potential is output.

[0058] In the above technical scheme, the stray current value is obtained by acquiring the pipe-to-ground potential signal; the pipe-to-ground potential signal is loaded into a pH sensor, and the pH value of the pipeline corrosion interface under the action of the stray current is obtained in situ through the pH sensor; according to the stray current value and the pH value of the pipeline corrosion interface, a relationship function between the stray current and the corrosion rate is established; according to the relationship function between the stray current and the corrosion rate, the corrosion rate is calculated; according to the corrosion rate, the cathodic protection potential is optimized, and the optimized pipeline cathodic protection potential is output; based on the in-situ pH analysis method, a relationship function between the stray current, the cathodic protection current and the corrosion rate is established, and then the adjustment plan of the cathodic protection potential is clarified, and the optimization of the cathodic protection potential under the interference of the stray current is realized.

[0059] Specifically, the cathodic protection potential dynamic adjustment method is a cathodic protection potential dynamic adjustment method that takes into account the stray current effect; the stray current test technology includes a pipe-to-ground potential forward offset method, a pipe-to-ground potential continuous detection, a ground potential gradient detection, a stray current interference probe test method, and an SCM intelligent stray current mapping instrument mapping; specifically, the following steps are included:

[0060] Collect the actual potential information of the buried pipeline site and determine the potential signal characteristics of the stray current; confirm the change law of the pH at the pipeline interface through the inductive pH sensor; determine the interface pH offset under the combined action of the current cathodic protection potential and the stray current: if it exceeds the safety limit, adjust the cathodic protection potential before the corrosion intensifies; if it does not exceed the safety limit, verify the interface pH after adjusting the cathodic protection potential through the inductive pH sensor to confirm that the cathodic protection potential meets the requirements; if it meets the requirements, control the output of the constant potentiostat to optimize the cathodic protection potential through the intelligent cathodic protection pile; if it does not meet the requirements, repeat the step of confirming the change law of the pipeline interface pH through the inductive pH sensor.

[0061] In the above technical scheme, based on the in-situ pH analysis method, a relationship function between stray current, cathodic protection current and corrosion rate is established, thereby clarifying the adjustment plan of the cathodic protection potential; the corrosion rate corresponding to the pH under the interference of stray current is found on the corrosion rate and pH relationship curve, wherein the horizontal axis of the relationship curve is the interface pH, and the vertical axis is the corrosion rate; through the above relationship function, the cathodic protection potential is dynamically adjusted to achieve the optimization of the cathodic protection potential under the interference of stray current.

[0062] In a specific embodiment, the relationship function between the stray current and the corrosion rate is:

[0063] lgv corr =v blank +k1×lg(pH 土壤 )-k2×(pH 信号 -pH 土壤 );

[0064] Among them, v corr represents the pipeline corrosion rate under the interference of stray current; v blank Represents the natural corrosion rate of the pipeline when there is no stray current; pH 土壤 and pH 信号 Represent the pH values ​​of soil and signal electrode respectively, k1 and k2 represent the weight coefficients of interface and soil pH on corrosion; lg represents the logarithm.

[0065] In this embodiment, an in-situ test method for the pH of the pipeline corrosion interface under the interference of stray current is designed, and a relationship function model between stray current and corrosion rate is established through electrochemical theory and analysis methods, so that the reliability of corrosion feature analysis is higher; the effectiveness of the cathodic protection state is identified by using interface pH analysis, and the optimization of the cathodic protection potential is further achieved through instrument control, which is more accurate than the control technology based only on potential analysis.

[0066] In a specific implementation scheme, under the interference of stray current, the conversion relationship between the cathodic protection potential and the pH value of the pipeline metal interface is:

[0067]

[0068] Among them, U max and V cp They represent the highest tube-to-ground voltage of stray current and the cathodic protection potential, α(E) represents the hydrogen ion diffusion coefficient, k represents the correlation coefficient, and pH 感应 Corresponding to the pipe interface pH.

[0069] In this embodiment, the pH in-situ measurement technology is applied to the field of stray current corrosion analysis. The pH changes at the pipeline interface under the action of stray current and cathodic protection current can be measured by the designed test device, so that the corrosion state can be analyzed by electrochemical methods. At the same time, by using the in-situ measurement of pH changes, a relationship function between stray current, cathodic protection current and corrosion rate is established, the dynamic adjustment method of cathodic protection potential is clarified, and the optimization of cathodic protection potential under stray current interference is achieved.

[0070] In a specific embodiment, the pH sensor comprises a disk electrode and a ring electrode surrounding the disk electrode, wherein:

[0071] The disk electrode serves as a stray current and cathodic protection current channel and a signal probe for in-situ simulation of the pipeline interface under stray current interference;

[0072] The ring electrode is used as a pH response probe to collect the interface pH for in-situ analysis.

[0073] Specifically, refer to Figure 3 and Figure 4 The pH sensor adopts an inductive pH sensor, which is composed of a disk electrode and a ring electrode surrounding the disk electrode, wherein the disk electrode serves as a stray current and cathodic protection current channel, and serves as a signal probe to simulate the pipeline interface under stray current interference in situ, and the ring electrode is composed of iridium oxide with pH response characteristics, and serves as a pH response probe for in situ analysis of interface pH.

[0074] In a specific embodiment, the functional expression of the pH response value is:

[0075] pH 感应 =a×(E oc + b);

[0076]

[0077] Where a and b are linearly fitted to the open circuit potential E of the response probe. oc The relationship curve with pH standard solution is obtained; and are the H in the response probe and the signal probe, respectively. + Ion concentration, and are the OH- ion concentrations in the response probe and the signal probe, respectively. and are the pH value of soil electrolyte, N D is the collection coefficient of the signal probe.

[0078] exist Figure 2 In the embodiment of the present application, a cathodic protection potential dynamic adjustment system is provided, comprising:

[0079] The stray current acquisition module is used to obtain the pipe-to-ground potential signal and obtain the stray current value;

[0080] A pH in-situ analysis module is used to load the pipe-to-ground potential signal to a pH sensor, and obtain the pH value of the pipeline corrosion interface under the action of stray current in situ through the pH sensor; and establish a relationship function between stray current and corrosion rate according to the stray current value and the pH value of the pipeline corrosion interface;

[0081] A cathodic protection potential analysis module, used to calculate the corrosion rate according to the relationship function between the stray current and the corrosion rate; and to optimize the cathodic protection potential according to the corrosion rate;

[0082] The output module is used to output the optimized pipeline cathodic protection potential.

[0083] In the above technical scheme, the stray current value is obtained by acquiring the pipe-to-ground potential signal; the pipe-to-ground potential signal is loaded into a pH sensor, and the pH value of the pipeline corrosion interface under the action of the stray current is obtained in situ through the pH sensor; according to the stray current value and the pH value of the pipeline corrosion interface, a relationship function between the stray current and the corrosion rate is established; according to the relationship function between the stray current and the corrosion rate, the corrosion rate is calculated; according to the corrosion rate, the cathodic protection potential is optimized, and the optimized pipeline cathodic protection potential is output; based on the in-situ pH analysis method, a relationship function between the stray current, the cathodic protection current and the corrosion rate is established, and then the adjustment plan of the cathodic protection potential is clarified, and the optimization of the cathodic protection potential under the interference of the stray current is realized.

[0084] An embodiment of the present application provides a pipeline protection device, including the cathodic protection potential dynamic adjustment system.

[0085] exist Figure 5 and Figure 6 In a specific implementation scheme, it also includes: a pipeline potential monitor, an inductive pH sensor, an intelligent cathodic protection pile and a constant potential meter, and the output module is electrically connected to the constant potential meter, wherein,

[0086] The pipeline potential monitor is used to collect the pipeline-to-ground potential signal;

[0087] The inductive pH sensor is used to analyze the pH characteristics of the pipeline interface under the combined action of stray current and cathodic protection current, and to analyze and determine the adjustment of the cathodic protection potential based on the analysis results;

[0088] The intelligent cathodic protection pile is used to collect potential data and potential output commands, and dynamically adjust the cathodic protection potential according to the signal of the inductive pH sensor;

[0089] The constant potentiostat is used to receive the potential output command of the intelligent cathodic protection pile and adjust the output potential according to the potential output command.

[0090] In the above technical scheme, the stray current value is obtained by acquiring the pipe-to-ground potential signal; the pipe-to-ground potential signal is loaded into a pH sensor, and the pH value of the pipeline corrosion interface under the action of the stray current is obtained in situ through the pH sensor; according to the stray current value and the pH value of the pipeline corrosion interface, a relationship function between the stray current and the corrosion rate is established; according to the relationship function between the stray current and the corrosion rate, the corrosion rate is calculated; according to the corrosion rate, the cathodic protection potential is optimized, and the optimized pipeline cathodic protection potential is output; based on the in-situ pH analysis method, a relationship function between the stray current, the cathodic protection current and the corrosion rate is established, and then the adjustment plan of the cathodic protection potential is clarified, and the optimization of the cathodic protection potential under the interference of the stray current is realized.

[0091] In a specific implementation scheme, the inductive pH sensor is electrically connected to the pipeline potential monitor, the intelligent cathodic protection pile is electrically connected to the pipeline potential monitor, and the intelligent cathodic protection pile is electrically connected to the constant potentiostat; the inductive pH sensor is used to be directly electrically connected to the pipeline.

[0092] Specifically, refer to Figure 5 and Figure 6 The cathodic protection potential dynamic adjustment device under stray current interference is composed of an intelligent cathodic protection pile 02, a first stray current tester 04, a second stray current tester 05, and an inductive pH sensor 03, which is connected to the buried pipeline 01 through the connection method shown in the figure.

[0093] In a specific implementation manner, the inductive pH sensor is also used to verify pH change data under the output potential value of the intelligent cathodic protection pile.

[0094] Specifically, refer to Figure 3 The inductive pH sensor consists of two parts. The internal disk electrode is used as a signal probe to pass stray current and cathodic protection current to simulate the chemical state of the pipeline interface under the interference of stray current; the external ring electrode is used as a pH response electrode to in-situ measure the pH of the signal probe interface through the pH responsive material, which is used to analyze the pH value of the pipeline interface.

[0095] refer to Figure 4 The testing principle of the inductive pH sensor is as follows: the signal obtained by the pipeline potential monitor is input into the disk electrode through the multifunctional constant potentiostat, and the inductive pH sensor is rotated at a certain speed, and then the interface pH relationship model between the disk electrode and the ring electrode can be established, and the open circuit potential and pH value of the ring electrode interface can be obtained by the constant potentiostat analyzer, and then the disk electrode pH value can be calculated.

[0096] In this embodiment, the device includes a pipeline potential monitor, an inductive pH sensor and an intelligent cathodic protection pile connected to the pipeline potential monitor, and a constant potentiostat connected to the intelligent cathodic protection pile; the pipeline potential monitor is used to receive pipeline stray current signals, the inductive pH sensor is used to in-situ analyze the pH value of the pipeline interface under stray current interference, the intelligent cathodic protection pile dynamically adjusts the cathodic protection potential based on the pH value, and further verifies it through the pH sensor, so that the constant potentiostat outputs an appropriate potential. This application measures the pH value of the pipeline interface under stray current interference in situ, transmits it to the intelligent cathodic protection pile, identifies the cathodic protection state through correlation analysis, identifies the cathodic protection state according to the correlation between pH and corrosion, and dynamically adjusts the constant potentiostat.

[0097] Furthermore, the reliability and accuracy of the device were verified through corrosion test piece experiments. Table 1 shows the weight loss data of the corrosion test pieces obtained by adjusting the cathodic protection potential using the scheme and the traditional potential measurement method according to different stray current signals and cathodic protection potentials.

[0098]

[0099] Table 1

[0100] It can be seen from the above test data that the scheme of dynamically adjusting the cathodic protection potential by in-situ measuring pH can effectively reduce the corrosion rate under the interference of stray current, and the effect is significantly better than the traditional scheme: the scheme of the present application can not only test the pH of the corrosion interface in situ, establish the relationship between stray current and corrosion rate, and greatly improve the reliability of corrosion feature analysis, but also effectively identify the effectiveness of the cathodic protection status, and alleviate the interference of stray current through dynamic adjustment of the constant potential instrument, which is more accurate than the control technology based only on potential analysis.

[0101] Those skilled in the art will appreciate that the present application may be implemented as a system, method or computer program product.

[0102] Therefore, the present disclosure may be specifically implemented in the following forms, namely: it may be completely hardware, it may be completely software (including firmware, resident software, microcode, etc.), or it may be a combination of hardware and software, generally referred to herein as a "circuit", "module" or "system". In addition, in some embodiments, the present application may also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium may contain computer-readable program code.

[0103] Any combination of one or more computer-readable media can be used. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0104] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art can change, modify, replace and modify the above embodiments within the scope of the present application. On this basis, a variety of replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A method for dynamically adjusting cathodic protection potential, characterized in that: The following steps are involved: Obtain the pipe-to-ground potential signal and obtain the stray current value; The pipe-to-ground potential signal is loaded into a pH sensor, and the pH value of the pipeline corrosion interface under the action of stray current is obtained in situ through the pH sensor; Establishing a relationship function between stray current and corrosion rate according to the stray current value and the pH value of the pipeline corrosion interface; Calculating the corrosion rate according to the relationship function between the stray current and the corrosion rate; According to the corrosion rate, the cathodic protection potential is optimized, and the optimized pipeline cathodic protection potential is output.

2. The method for dynamic adjustment of cathodic protection potential according to claim 1, characterized in that: The relationship function between the stray current and the corrosion rate is: Among them, v corr represents the pipeline corrosion rate under the interference of stray current; v blank Represents the natural corrosion rate of the pipeline when there is no stray current; pH 土壤 and pH 信号 Represent the pH values ​​of soil and signal electrode respectively, k1 and k2 represent the weight coefficients of interface and soil pH on corrosion; lg represents the logarithm.

3. The method for dynamic adjustment of cathodic protection potential according to claim 2, characterized in that: Under the interference of stray current, the conversion relationship between the cathodic protection potential and the pH value of the pipeline metal interface is: Among them, U max and V cp They represent the highest tube-to-ground voltage of stray current and the cathodic protection potential, α(E) represents the hydrogen ion diffusion coefficient, k represents the correlation coefficient, and pH 感应 Corresponding to the pipe interface pH.

4. The method for dynamic adjustment of cathodic protection potential according to claim 3, characterized in that: The pH sensor comprises a disk electrode and a ring electrode surrounding the disk electrode, wherein: The disk electrode serves as a stray current and cathodic protection current channel and a signal probe for in-situ simulation of the pipeline interface under stray current interference; The ring electrode is used as a pH response probe to collect the interface pH for in-situ analysis.

5. The method for dynamic adjustment of cathodic protection potential according to claim 4, characterized in that: The functional expression of the pH response value is: pH 感应 =a×(E oc +b); Where a and b are linearly fitted to the open circuit potential E of the response probe. oc The relationship curve with pH standard solution is obtained; and are the H in the response probe and the signal probe, respectively. + Ion concentration, and OH in the response probe and signal probe, respectively. - Ion concentration, and are the pH value of soil electrolyte, N D is the collection coefficient of the signal probe.

6. A cathodic protection potential dynamic adjustment system, characterized in that: include: The stray current acquisition module is used to obtain the pipe-to-ground potential signal and obtain the stray current value; A pH in-situ analysis module is used to load the pipe-to-ground potential signal to a pH sensor, and obtain the pH value of the pipeline corrosion interface under the action of stray current in situ through the pH sensor; and establish a relationship function between stray current and corrosion rate according to the stray current value and the pH value of the pipeline corrosion interface; A cathodic protection potential analysis module, used to calculate the corrosion rate according to the relationship function between the stray current and the corrosion rate; and to optimize the cathodic protection potential according to the corrosion rate; The output module is used to output the optimized pipeline cathodic protection potential.

7. A pipeline protection device, characterized in that: It comprises the cathodic protection potential dynamic adjustment system as described in claim 6.

8. The cathodic protection potential dynamic adjustment system according to claim 7, characterized in that: Also includes: Pipeline potential monitor, inductive pH sensor, intelligent cathode protection pile and constant potential meter, the output module is electrically connected to the constant potential meter, wherein, The pipeline potential monitor is used to collect the pipeline-to-ground potential signal; The inductive pH sensor is used to analyze the pH characteristics of the pipeline interface under the combined action of stray current and cathodic protection current, and to analyze and determine the adjustment of the cathodic protection potential based on the analysis results; The intelligent cathodic protection pile is used to collect potential data and potential output commands, and dynamically adjust the cathodic protection potential according to the signal of the inductive pH sensor; The constant potentiostat is used to receive the potential output command of the intelligent cathodic protection pile and adjust the output potential according to the potential output command.

9. The method for dynamic adjustment of cathodic protection potential according to claim 8, characterized in that: The inductive pH sensor is electrically connected to the pipeline potential monitor, the intelligent cathode protection pile is electrically connected to the pipeline potential monitor, and the intelligent cathode protection pile is electrically connected to the constant potentiostat; the inductive pH sensor is used to be directly electrically connected to the pipeline.

10. The cathodic protection potential dynamic adjustment system according to claim 9, characterized in that: The inductive pH sensor is also used to verify the pH value change data under the output potential value of the intelligent cathodic protection pile.

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