CN110849799B - Device for researching interference of stray current on buried pipeline cathode protection system - Google Patents
Device for researching interference of stray current on buried pipeline cathode protection system Download PDFInfo
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- CN110849799B CN110849799B CN201911080245.9A CN201911080245A CN110849799B CN 110849799 B CN110849799 B CN 110849799B CN 201911080245 A CN201911080245 A CN 201911080245A CN 110849799 B CN110849799 B CN 110849799B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/22—Monitoring arrangements therefor
Abstract
The invention discloses an experimental device for researching interference of stray current on a buried pipeline cathode protection system, wherein a forced current cathode protection system comprises a buried pipeline provided with a plurality of damage points, one end of the buried pipeline is connected with a cathode of a constant potential rectifier through a cable, an auxiliary anode is buried in an anode ground bed, and a reference electrode of the constant potential rectifier is arranged at the end side of the buried pipeline; the stray current interference system comprises a current interference source, and a pair of interference electrodes connected with the current interference source are arranged on one side or two sides of the buried pipeline; the electrical property detection system comprises a plurality of test piles which are arranged along the length direction of the buried pipeline and used for detecting current and potential data of the buried pipeline and a damaged point. The invention can simulate the change of the length of the pipeline by adjusting the resistance value; the interference rule of the stray current on the buried pipeline cathode protection system is researched by changing and adjusting the output voltage of the stray current interference source and the positions of the two interference electrodes inserted into the soil.
Description
Technical Field
The invention relates to a test device, in particular to a device for researching interference of stray current on a buried pipeline cathode protection system, and belongs to the technical field of pipeline corrosion and protection detection.
Background
The buried oil and gas pipeline is corroded to different degrees due to the influence of soil, moisture, stray current and the like, if the buried oil and gas pipeline is not protected, damage accidents are easy to happen, and loss and harm are huge.
Stray current mainly originates from grounding or electric leakage of electric equipment such as electrified railways, subways, high-voltage wires, electric welding machines, transformers and the like. The stray current is divided into a direct current stray current and an alternating current stray current. The stray current interference can cause severe corrosion of the metal pipeline, and the corrosion speed of the metal pipeline is higher than that of natural corrosion, and the metal pipeline is more concealed, sudden and uncertain.
In recent years, leakage accidents of oil and gas pipelines due to stray current interference corrosion frequently occur in the united states, germany, canada, and the like. Statistically, there are approximately $ 10 billion losses in metal corrosion in the United states each year, with 5% of the losses being due to stray current interference. More than 40 corrosion perforation events occur in the northeast crude oil pipeline system of China in more than twenty years since the beginning of operation, wherein the events caused by the interference of the stray current and the corrosion account for 80%. A plurality of buried pipelines which are crossed and parallel with the electrified railway have perforation leakage only in half a year, the corrosion depth of one year reaches 10-12 mm, and the reason is caused by stray current interference corrosion. Therefore, it is necessary to conduct an intensive study on the interference corrosion caused by the stray current.
At present, the buried pipeline adopts the anticorrosive coating and cathodic protection combined protection, carries out relatively simple simulation research on a small-sized experimental device in a multi-concentration laboratory for researching stray current interference corrosion, has great difference with the running environment and the real situation of the actual pipeline on site, and can not really realize real and effective interference simulation, so that a set of corrosion detection experimental device suitable for the buried pipeline in the actual outdoor soil and interfered by the stray current is necessary to be designed, and the influence rule of the stray current on the buried pipeline cathodic protection system is deeply researched.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an experimental device for researching the interference influence of stray current on a buried pipeline cathode protection system.
In order to achieve the above object, the present invention adopts the following technical solutions:
a device for researching the interference of stray current on a buried pipeline cathode protection system comprises a forced current cathode protection system, a stray current interference system and an electrical property detection system;
the forced current cathodic protection system comprises a buried pipeline provided with a plurality of breakage points, one end of the buried pipeline is connected with a cathode of a constant potential rectifier through a cable, an auxiliary anode is buried in an anode ground bed, and a reference electrode of the constant potential rectifier is arranged on the side of the end part of the buried pipeline; the other end is closed by an insulating end enclosure;
the stray current interference system comprises a current interference source connected with a pair of interference electrodes, and the interference electrodes are arranged on one side or two sides of the buried pipeline;
the electrical property detection system comprises a plurality of test piles which are arranged along the length direction of the buried pipeline and used for detecting current and potential data of the buried pipeline and a damaged point.
The current interference source comprises an alternating current interference source and a direct current interference source.
The test pile comprises a current test pile and a potential test pile;
the current testing pile comprises a universal meter fixed by a pile body, the potential testing pile comprises a power-off potential tester fixed by the pile body, and the corresponding reference electrode is arranged on the side of the buried pipeline.
Further, the current test pile is used for detecting the end part of the buried pipeline; and the electric potential testing pile detects the length of the buried pipeline.
The buried pipeline is formed by connecting two sections of steel pipes coated with outer anticorrosive layers in series, an adjustable resistor is connected at the joint of the two sections of steel pipes in series, and the change of the length of the pipeline is simulated by adjusting the resistance value.
The regulation of the stray current interference comprises:
adjusting the output voltage of the current interference source;
adjusting the electrode spacing of the two interference electrodes;
adjusting the relative position of the interfering electrode and the buried pipeline, comprising: the distance from the buried pipeline and the parallel, perpendicular or cross position state of the buried pipeline.
The current and potential data include: under the conditions of natural environment, cathodic protection and stray current interference, the real-time and change conditions of the pipe-to-ground potential, the power-off potential, the protection potential and the current of each test pile and a damaged point along the line.
The invention has the advantages that:
the invention relates to a set of experimental device for researching the interference influence of stray current on a buried pipeline cathode protection system, which consists of a forced current cathode protection system, a stray current interference system and an electrical property detection system. The buried pipeline is formed by connecting two sections of steel pipes and an adjustable resistor in series, and the change of the length of the pipeline can be simulated by adjusting the resistance value; stray current interference system is through changing and adjusting stray current interference source output voltage size, two position that disturb the electrode and insert in soil, change stray current to burying the influence state of ground pipeline, its influence accessible electric current, electric potential test stake detect to study stray current to the interference law of burying ground pipeline cathodic protection system, the corruption is disturbed in the data ization stray current, the buried pipeline of being convenient for adopts the research of anticorrosive coating and cathodic protection joint protection, has very strong practicality and extensive suitability.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention.
The designations in the drawings have the following meanings: 1. the device comprises a buried pipeline, 2, an auxiliary anode, 3, a constant potential rectifier, 4, a current testing pile, 5, a potential testing pile, 6, a damage point, 7, a reference electrode, 8, an adjustable resistor, 9, an insulating seal head, 10, a universal meter, 11, a power-off potential tester, 12, a direct current interference source, 13, an alternating current interference source, 14, an interference electrode, 15 and a guardrail.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
A device for researching the interference of stray current on a buried pipeline cathode protection system comprises a forced current cathode protection system, a stray current interference system and an electrical property detection system.
The forced current cathodic protection system consists of a buried pipeline 1 and a potentiostat 3. The buried pipeline 1 is formed by connecting two steel pipes coated with 3PE outer anticorrosive layers in series, an adjustable resistor 8 is connected in series at the joint of the two steel pipes, one end of the adjustable resistor is connected with a cathode of a constant potential rectifier 3 through a cable, the other end of the adjustable resistor is closed by an insulating end enclosure 9, and a plurality of damage points 6 are arranged on the steel pipes. The damaged points 6 are a plurality of anticorrosive coating damaged detection points artificially manufactured on the pipeline along the line, the diameter of the damaged points 6 is about 4-6mm, and a detection cable is welded and led out from each damaged point 6 and is used for carrying out protection parameter and interference detection.
The potentiostat 3 is an IMF-5/10 type high-frequency switch potentiostat 3, and an input power supply: ac 220V, frequency: 50Hz, DC output: 10V/5A. The constant potential rectifier 3 is arranged in the cathodic protection room and provides power for the cathodic protection system. The auxiliary anode 2 is formed by two groups of MMO noble metal oxide prepackaged anodes which are installed in parallel and buried in an anode ground bed. The reference electrode 7 is long-acting saturated Cu/CuSO4And a reference electrode 7 disposed at the side of the end of the buried pipeline 1.
The stray current interference system consists of an alternating current interference source 13 and a direct current interference source 12 which are respectively connected with a pair of interference electrodes 14; and the interference electrodes 14 are respectively disposed at one side or both sides of the buried pipeline 1. The interference electrode 14 is made of a tip exposed discharge type steel chisel with good conductivity, other parts of the steel chisel except the tip part are tightly wound by an insulating adhesive tape to ensure good insulation, and the metal electrode is connected with an output end of an interference source through a wire welded at the top.
The electrical property detection system consists of 1 current test pile 4 and 5 potential test piles 5 which are arranged along the pipeline; the current test pile 4 is used for detecting the end part of the buried pipeline 1 and comprises a universal meter 10 fixed by a pile body; the potential testing pile 5 comprises a power-off potential tester 11 (or a universal meter 10) fixed by a pile body, the detection is carried out along the length of the buried pipeline 1, and detection points comprise the buried pipeline 1 and a breakage point 6; a corresponding reference electrode 7 is placed to the side of the buried pipeline 1.
The current test pile 4 consists of a Fluke289 type universal meter 10 and a SYCZ-1 type steel pipe pile which have the functions of continuously acquiring, storing and processing data; the potential testing pile 5 consists of a Fluke289 type universal meter 10, an uDL2 type cathodic protection outage potential tester 11 and an SYCZ-1 type steel pipe pile; the real-time and continuous detection and research of the cathodic protection parameters under the interference of different stray currents along the pipeline are realized.
In actual application:
the device of the invention is built in an outdoor air-ground guardrail 15, and during testing:
A. the change of the length of the pipeline is simulated by adjusting the resistance value of the adjustable resistor 8, the simulation test of the long-distance pipeline is realized, and the corrosion, protection and interference conditions under different pipeline lengths are researched.
B. And the constant potential rectifier 3 is used for implementing forced current cathodic protection on the buried pipeline of the experimental device.
C. The interference influence of the stray current on the cathode protection system of the buried pipeline 11 is researched by adjusting the output voltage of the direct current interference power supply.
D. The interference influence of stray current on a buried pipeline cathode protection system is researched by adjusting the output voltage of the alternating current interference power supply.
E. The interference effect of stray currents on the buried pipeline cathodic protection system is studied by varying and adjusting the insertion position of two interfering electrodes 14 into the soil (inter-electrode distance, distance from, parallel to, perpendicular to, or crossing the buried pipeline, etc.).
F. The real-time and change conditions of pipe-to-ground potential, power-off potential, protection potential and current at each test pile, damage point 6 and the like along the line under the conditions of natural environment, cathodic protection, stray current interference and the like of the buried pipeline are measured by using a universal meter 10 and a power-off potential tester 11, so that the interference rule of the stray current on the buried pipeline cathodic protection system is researched.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (7)
1. A device for researching the interference of stray current on a buried pipeline cathode protection system is characterized by comprising a forced current cathode protection system, a stray current interference system and an electrical property detection system;
the forced current cathodic protection system comprises a buried pipeline (1) provided with a plurality of damage points, one end of the buried pipeline (1) is connected with a cathode of a constant potential rectifier (3) through a cable, an auxiliary anode (2) is buried in an anode ground bed, and a reference electrode of the constant potential rectifier (3) is arranged at the end side of the buried pipeline (1);
the stray current interference system comprises a current interference source, and a pair of interference electrodes connected with the current interference source is arranged on one side or two sides of the buried pipeline (1);
the electrical property detection system comprises a plurality of test piles which are arranged along the length direction of the buried pipeline (1) and are used for detecting current and potential data of the buried pipeline and a damaged point;
the buried pipeline (1) is formed by connecting two sections of steel pipes coated with outer anticorrosive layers in series, an adjustable resistor (8) is connected in series at the joint of the two sections of steel pipes, and the change of the length of the pipeline is simulated by adjusting the resistance value.
2. The device for researching the interference of stray current on the buried pipeline cathode protection system is characterized in that the current interference sources comprise an alternating current interference source (13) and a direct current interference source (12).
3. The device for researching the interference of stray current on a buried pipeline cathode protection system according to claim 1, wherein the test piles comprise a current test pile (4) and a potential test pile (5);
the current test pile comprises a universal meter (10) fixed by a pile body, the potential test pile comprises a power-off potential tester (11) fixed by the pile body, and a corresponding reference electrode is arranged on the side of a buried pipeline.
4. A device for studying the interference of stray currents on a buried pipeline cathodic protection system as defined in claim 3, characterized in that said current test pile (4) is detected at the end of the buried pipeline (1);
and the potential testing pile (5) detects along the length of the buried pipeline (1).
5. The apparatus for studying stray current interference on a buried pipeline cathodic protection system as claimed in claim 1, wherein said stray current interference system adjustment comprises:
adjusting the output voltage of the current interference source;
adjusting the electrode spacing of the two interference electrodes;
adjusting the relative position of the interfering electrode and the buried pipeline, comprising: the distance from the buried pipeline and the parallel, perpendicular or cross position state of the buried pipeline.
6. The device for researching the interference of stray current on a buried pipeline cathode protection system according to claim 1, wherein the current and potential data comprise:
under the conditions of natural environment, cathodic protection and stray current interference, the real-time and change conditions of the pipe-to-ground potential, the power-off potential, the protection potential and the current of each test pile and a damaged point along the line.
7. Device for studying the interference of stray currents on a buried pipeline cathodic protection system according to claim 1, characterized in that the other end of the buried pipeline (1) is closed by an insulating end-cap (9).
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| CN201911080245.9A CN110849799B (en) | 2019-11-07 | 2019-11-07 | Device for researching interference of stray current on buried pipeline cathode protection system |
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| CN201911080245.9A CN110849799B (en) | 2019-11-07 | 2019-11-07 | Device for researching interference of stray current on buried pipeline cathode protection system |
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| CN110849799B true CN110849799B (en) | 2022-05-13 |
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| CN112376052B (en) * | 2020-11-12 | 2022-09-13 | 重庆燃气集团股份有限公司 | Natural gas pipeline prevents stray current corrosion system and snooping device |
| CN115216776B (en) * | 2022-06-28 | 2024-03-01 | 国家管网集团浙江省天然气管网有限公司 | Natural gas pipe network potentiostat output optimization method based on time sequence prediction |
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