CN111575715A - Nuclear power plant buried pipeline anticorrosive coating defect detection system - Google Patents
Nuclear power plant buried pipeline anticorrosive coating defect detection system Download PDFInfo
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- 230000007547 defect Effects 0.000 title claims abstract description 77
- 238000000576 coating method Methods 0.000 title claims abstract description 43
- 239000011248 coating agent Substances 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000005260 corrosion Methods 0.000 claims description 14
- 230000007797 corrosion Effects 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 12
- 238000004210 cathodic protection Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 4
- 238000009412 basement excavation Methods 0.000 abstract description 3
- 238000011156 evaluation Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
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- 230000002950 deficient Effects 0.000 description 2
- 230000004807 localization Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- -1 sulfur ions Chemical class 0.000 description 1
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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
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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
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/20—Constructional parts or assemblies of the anodic or cathodic protection apparatus
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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
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
- C23F2213/32—Pipes
Abstract
The invention belongs to the technical field of nuclear power maintenance, and particularly relates to a system for detecting defects of an anticorrosive coating of a buried pipeline in a nuclear power plant. In the nuclear power plant buried pipeline anticorrosive coating defect detection system of the embodiment of the disclosure, the controller acquires the electrified potential data and the outage potential data according to the first potential acquisition recorder, and acquires the potential gradient data from each second potential acquisition recorder, can confirm the size of the defect of the pipeline to be detected, therefore, under the non-excavation condition of the buried pipeline, the quantitative assessment is carried out on the size of the pipeline anticorrosive coating defect to be detected, in time, the size of the nuclear power plant buried pipeline anticorrosive coating defect is accurately mastered, and powerful support is provided for the evaluation and the repair of the nuclear power plant buried pipeline anticorrosive coating.
Description
Technical Field
The invention belongs to the technical field of nuclear power maintenance, and particularly relates to a system for detecting defects of an anticorrosive coating of a buried pipeline in a nuclear power plant.
Background
The buried steel pipeline of the nuclear power plant is buried underground, and the outer wall of the pipeline is coated with an anticorrosive coating to slow down the soil corrosion of the pipeline. With the increase of the service life of the buried pipeline, the corrosion-resistant layer inevitably degrades; in addition, during the construction or maintenance of the buried pipeline, mechanical scratches may exist to cause the anticorrosive coating to be damaged, resulting in the defect of the anticorrosive coating. The defective part of the anticorrosive coating is preferentially affected by various erosion ions (chloride ions, sulfate ions and sulfur ions) in soil, and forms a large cathode-small anode corrosion battery with the complete part of the anticorrosive coating, so that the corrosion rate of the pipe body at the defective part of the anticorrosive coating is accelerated, and the corrosion degree is increased until the buried pipeline is corroded and perforated. In view of this, how to accurately and effectively locate the defects of the anticorrosive coating of the buried pipeline and effectively monitor the sizes of the defects become problems to be solved urgently.
Disclosure of Invention
In order to overcome the problems in the related technology, a nuclear power plant buried pipeline anticorrosive coating defect detection system is provided.
According to an aspect of the disclosed embodiment, a nuclear power plant buried pipeline anticorrosive coating defect detection system is provided, nuclear power plant buried pipeline anticorrosive coating defect detection system includes: the device comprises a first reference electrode, a pipeline test pile, at least one second reference electrode, a first potential acquisition recorder, at least one second potential acquisition recorder and a controller;
one end of the pipeline testing pile is connected with a pipeline to be tested under the ground, the other end of the pipeline testing pile is connected with the first reference electrode, and the first reference electrode is arranged on the ground surface above the defect position of the pipeline to be tested;
the first potential acquisition recorder is connected in series between the pipeline test pile and the first reference electrode and is used for acquiring power-on potential data and power-off potential data of the pipeline to be tested;
each second reference electrode is arranged on the ground surface and surrounds the first reference electrode, and a second potential acquisition recorder is connected between each second reference electrode and the first reference electrode in series and is used for acquiring potential gradient data between the second reference electrode and the first reference electrode;
the controller is respectively connected with the first potential acquisition recorder and each second potential acquisition recorder, the controller acquires power-on potential data and power-off potential data from the first potential acquisition recorder, and the controller acquires potential gradient data from each second potential acquisition recorder;
and the controller determines the size of the defect of the pipeline to be detected according to the power-on potential data, the power-off potential data and the plurality of potential gradient data.
In a possible implementation manner, the system for detecting the defects of the anticorrosive layer of the buried pipeline in the nuclear power plant comprises a plurality of second reference electrodes, and the controller determines the defect size of the pipeline to be detected below each second reference electrode and the corresponding first reference electrode according to potential gradient data, outage potential data and energization potential data between each second reference electrode and the corresponding first reference electrode;
and the controller determines the size of the defect of the pipeline to be detected according to the sizes of the plurality of defects.
In a possible implementation manner, the system for detecting the defects of the anticorrosive coating of the buried pipeline in the nuclear power plant further comprises a first current breaker, a first trigger and a second trigger, wherein the first current breaker is used for controlling the on-off of a circuit between the pipeline to be detected and a cathode protection power supply;
the first trigger is connected with the first current breaker, and the second trigger is connected with the first potential acquisition recorder;
the moment when the first trigger triggers the first current breaker to be communicated with a circuit between a pipeline to be tested and a cathode protection power supply is the same as the moment when the second trigger triggers the first potential acquisition recorder to acquire data.
In a possible implementation manner, the system for detecting the defects of the anticorrosive coating of the buried pipeline in the nuclear power plant further comprises a second current breaker, a third trigger and at least one fourth trigger, wherein the second current breaker is used for controlling the on-off of a circuit between the pipeline to be detected and a cathode protection power supply;
the third triggers are connected with the second current breakers, and each fourth trigger is connected with a second potential acquisition recorder;
the moment when the third trigger triggers the second current breaker to break the circuit between the pipeline to be tested and the cathode protection power supply is the same as the moment when each fourth trigger triggers the corresponding second potential acquisition recorder to acquire data;
the moment when the third trigger triggers the second current breaker to be communicated with the circuit between the pipeline to be tested and the cathode protection power supply is the same as the moment when each fourth trigger triggers the corresponding second potential acquisition recorder to acquire data.
In a possible implementation manner, the controller determines potential gradient data between the second reference electrode and the first reference electrode corresponding to each second potential collecting recorder according to the potential gradient data collected by each second potential collecting recorder under the condition that a circuit between the pipeline to be measured and the cathode protection power supply is disconnected and the potential gradient data collected by each second potential collecting recorder under the condition that the circuit between the pipeline to be measured and the cathode protection power supply is communicated.
In one possible implementation manner, the system for detecting the defects of the anticorrosive coating of the buried pipeline in the nuclear power plant further includes: the fourth reference electrode, a plurality of third reference electrodes, a plurality of third potential acquisition recorders and a plurality of distance sensors;
each third reference electrode is connected to the fourth reference electrode, and a plurality of third reference electrodes;
a distance sensor is connected between each third reference electrode and the fourth reference electrode and is used for acquiring distance data between the third reference electrode and the fourth reference electrode;
a third potential acquisition recorder is connected between each third reference electrode and the fourth reference electrode, and the third potential acquisition recorder is used for acquiring potential gradient data between the third reference electrode and the fourth reference electrode;
the controller is respectively connected with each third potential acquisition recorder and each distance sensor, acquires potential gradient data from each third potential acquisition recorder, and acquires distance data from each distance sensor;
and the controller determines the position of the defect of the pipeline to be detected according to the potential gradient data and the distance data between the third reference electrodes and the fourth reference electrodes.
In one possible implementation manner, the system for detecting the defects of the anticorrosive coatings of the buried pipelines in the nuclear power plant comprises a plurality of second reference electrodes, wherein the distances between the second reference electrodes and the first reference electrodes are completely the same, partially the same or completely different.
In one possible implementation manner, the system for detecting the defects of the anticorrosive coatings of the buried pipelines in the nuclear power plant comprises a plurality of second reference electrodes, and each second reference electrode uniformly surrounds the first reference electrode.
In a possible implementation manner, the system for detecting the defects of the anticorrosive layer of the buried pipeline in the nuclear power plant comprises a plurality of second reference electrodes, wherein each second reference electrode and the first reference electrode are arranged in a straight line.
In a possible implementation manner, the first reference electrode faces the axis of the pipeline to be measured.
The invention has the beneficial effects that: in the nuclear power plant buried pipeline anticorrosive coating defect detection system of the embodiment of the disclosure, the controller acquires the electrified potential data and the outage potential data according to the first potential acquisition recorder, and acquires the potential gradient data from each second potential acquisition recorder, can confirm the size of the defect of the pipeline to be detected, therefore, under the non-excavation condition of the buried pipeline, the quantitative assessment is carried out on the size of the pipeline anticorrosive coating defect to be detected, in time, the size of the nuclear power plant buried pipeline anticorrosive coating defect is accurately mastered, and powerful support is provided for the evaluation and the repair of the nuclear power plant buried pipeline anticorrosive coating.
Drawings
FIG. 1 is a schematic diagram illustrating a nuclear power plant buried pipeline corrosion protection layer defect detection system according to an exemplary embodiment.
FIG. 2 is a schematic diagram illustrating a nuclear power plant buried pipeline corrosion protection layer defect detection system according to an exemplary embodiment.
FIG. 3 is a schematic illustration of a pipe defect localization curve shown in accordance with an exemplary embodiment.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
FIG. 1 is a schematic diagram illustrating a nuclear power plant buried pipeline corrosion protection layer defect detection system according to an exemplary embodiment. FIG. 2 is a schematic diagram illustrating a nuclear power plant buried pipeline corrosion protection layer defect detection system according to an exemplary embodiment. As shown in fig. 1 and 2, the system for detecting the corrosion protection layer defect of the buried pipeline in the nuclear power plant may include: the device comprises a pipeline test pile 6, a first reference electrode 2, at least one second reference electrode 3, a first potential acquisition recorder 9, at least one second potential acquisition recorder 4 and a controller (not shown in the figure).
In the embodiment of the present disclosure, the controller may be represented as an electronic device that performs information processing and program running, and the controller may be, for example, a notebook computer, a desktop computer, a server, or the like.
As an example of the present embodiment, in the case of determining the defect position of the pipe, the first reference electrode 2 may be disposed on the ground surface above the defect position of the pipe 1 to be measured, wherein the position of the first reference electrode 2 may also be aligned with the axis of the pipe 1 to be measured.
The second reference electrodes may surround the first reference electrode, for example, the second reference electrodes may be uniformly distributed on a circumference centered on the first reference electrode; for another example, each second reference electrode may be respectively distributed on a plurality of concentric circles using the first reference electrode as a center of circle, and a distance between each second reference electrode and the first reference electrode may be greater than a radius of the pipe to be measured. The number of the second reference electrodes may be 3, 5 or 25, and the number of the second reference electrodes is not limited in the embodiments of the present disclosure.
Generally speaking, a cathodic protection power supply 15 can be connected in series between the buried pipeline and an auxiliary anode ground bed buried underground, the auxiliary anode ground bed 7 can be connected with the cathodic protection power supply 15 through a third current breaker 14, and the output current of the cathodic protection power supply forms anti-corrosion protection for the buried pipeline. The constant current output current signal of the cathode protection power supply can be set, and the output current of the cathode protection power supply is adjusted on site according to the polarization condition of the detected pipeline. One end of the pipeline testing pile 6 can be connected with the pipeline 1 to be tested under the ground, the other end of the pipeline testing pile 6 can be connected with the first reference electrode 2, and the first reference electrode 2 is arranged on the ground surface above the defect position of the pipeline 1 to be tested; a first potential acquisition recorder 9 can be connected in series between the pipeline test pile 6 and the first reference electrode 2, and the first potential acquisition recorder 9 is used for acquiring the power-on potential data and the power-off potential data of the pipeline 1 to be tested.
For example, the system for detecting the defects of the anticorrosive coating of the buried pipeline in the nuclear power plant further comprises a first current breaker 8, a first trigger (not shown in the figure) and a second trigger (not shown in the figure), wherein the first current breaker 8 can be used for controlling the on-off of a circuit between the pipeline 1 to be detected and the cathode protection power supply 15;
the first trigger can be connected with the first current breaker 8, and the second trigger can be connected with the first potential acquisition recorder 9; the moment when the first trigger triggers the first current breaker 8 to break the circuit between the pipeline 1 to be tested and the cathode protection power supply 15 can be the same as the moment when the second trigger triggers the first potential acquisition recorder 9 to acquire data; the time when the first trigger triggers the first current breaker 8 to communicate with the circuit between the pipeline 1 to be tested and the cathode protection power supply 15 can be the same as the time when the second trigger triggers the first potential acquisition recorder 9 to acquire data. For example, the timers of the first trigger and the second trigger may be synchronized (for example, the first trigger and the second trigger may implement the timer synchronization through a GPS signal, and the first trigger and the second trigger may implement the timer synchronization through other communication methods, which is not limited in this embodiment of the disclosure), so that the first trigger and the second trigger may send trigger signals at the same time, and when the first trigger triggers the first current breaker 8 to break the circuit between the pipeline 1 to be tested and the cathode protection power supply 15, the second trigger may also trigger the first potential collection recorder 9 to collect data at the same time; when the first trigger triggers the first current breaker 8 to communicate with the circuit between the pipeline 1 to be tested and the cathode protection power supply 15, the second trigger can also trigger the first potential acquisition recorder 9 to acquire data at the same time; therefore, the automatic and accurate acquisition of the power-on potential data and the power-off potential data of the pipeline 1 to be detected can be realized without a complex control system.
In a possible implementation mode, the circuit between the pipeline to be detected and the cathode protection power supply can be controlled to be disconnected or communicated manually by a maintainer, and the first potential acquisition recorder is controlled to acquire data.
The controller can be respectively connected with the first potential acquisition recorder 9 and each second potential acquisition recorder 4, the controller can acquire power-on potential data and power-off potential data from the first potential acquisition recorder 9, and the controller can also acquire potential gradient data from each second potential acquisition recorder 4;
the controller can determine the size of the defect of the pipeline 1 to be detected according to the power-on potential data, the power-off potential data and the plurality of potential gradient data.
For example, the controller may determine the size of the corrosion protection layer defect at each of the second reference electrodes 3 and the first reference electrode 2 according to the potential gradient data, the off-potential data, and the on-potential data between the second reference electrode 3 and the first reference electrode 2; and the controller determines the size of the defects of the anticorrosive coating of the pipeline 1 to be detected according to the sizes of the defects of the plurality of anticorrosive coatings.
For example, the controller may determine a correspondence relationship of each second reference electrode 3 to potential gradient data, a correspondence relationship of the number of each second reference electrode 3 to potential gradient values, and for each second reference electrode 3, the controller may determine the anticorrosive layer defect equivalent diameter d corresponding to each second reference electrode 3 according to the following formula:
dk＝φ/(Eon-Eoff)
where φ may be a value of potential gradient data between the second reference electrode and the first reference electrode, EonCan be an energizing potential, EoffMay be a power-off potential and k may be a constant.
And the controller can determine the shape and the size of the defect position of the anticorrosive coating of the pipeline to be detected according to the plurality of equivalent diameters d by taking the position coordinate of the first reference electrode as a center.
In a possible implementation manner, the controller may also determine an average value of the plurality of potential gradient data, and determine the shape and size of the defect position of the anticorrosive coating of the pipeline to be detected according to the average value, the power-off potential data and the power-on potential data.
In the nuclear power plant buried pipeline anticorrosive coating defect detection system of the embodiment of the disclosure, the controller acquires the electrified potential data and the outage potential data according to the first potential acquisition recorder, and acquires the potential gradient data from each second potential acquisition recorder, can confirm the size of the defect of the pipeline to be detected, therefore, under the non-excavation condition of the buried pipeline, the quantitative assessment is carried out on the size of the pipeline anticorrosive coating defect to be detected, in time, the size of the nuclear power plant buried pipeline anticorrosive coating defect is accurately mastered, and powerful support is provided for the evaluation and the repair of the nuclear power plant buried pipeline anticorrosive coating.
In a possible implementation manner, as shown in fig. 1 and fig. 2, the nuclear power plant buried pipeline anticorrosive coating defect detection system further includes at least one second current breaker 5, at least one third trigger (not shown in the figure) and at least one fourth trigger (not shown in the figure), and each second current breaker 5 can be used for controlling the on-off of a circuit between the pipeline 1 to be detected and the cathodic protection power supply 15; each third trigger can be connected to a second current breaker 5, and each fourth trigger can be connected to a second current sensor 4.
The moment when each third trigger triggers the corresponding second current breaker 5 to break the circuit between the pipeline 1 to be tested and the cathode protection power supply 15 is the same as the moment when each fourth trigger triggers the corresponding second potential acquisition recorder 4 to acquire data; the moment when each third trigger triggers the corresponding second current breaker 5 to communicate with the circuit between the pipeline 1 to be tested and the cathode protection power supply 15 is the same as the moment when each fourth trigger triggers the corresponding second potential acquisition recorder 4 to acquire data.
For example, the timers of the third and fourth triggers may be synchronized (for example, the third and fourth triggers may implement timer synchronization through GPS signals, and the third and fourth triggers may also implement timer synchronization through other communication methods, which is not limited in this embodiment of the present disclosure), the third and fourth triggers may send trigger signals at the same frequency (or at the same interval), and when the third trigger triggers the second current breaker 5 to disconnect the circuit between the pipeline 1 to be tested and the cathode protection power supply 15, the fourth trigger may also trigger the first potential collection recorder 9 to collect data at the same time; when the third trigger triggers the second current breaker 5 to communicate with the circuit between the pipeline 1 to be tested and the cathode protection power supply 15, the fourth trigger can also trigger the first potential acquisition recorder 9 to acquire data at the same time.
In a possible implementation manner, the controller determines potential gradient data between the second reference electrode and the first reference electrode corresponding to each second potential collecting recorder according to the potential gradient data collected by each second potential collecting recorder under the condition that a circuit between the pipeline to be measured and the cathode protection power supply is disconnected and the potential gradient data collected by each second potential collecting recorder under the condition that the circuit between the pipeline to be measured and the cathode protection power supply is communicated. For example, for each second potential collecting recorder, the controller may collect the potential gradient value of the second potential collecting recorder under the condition that the circuit between the pipeline to be measured and the cathodic protection power supply is communicated, the difference between the potential gradient value and the potential gradient value acquired under the condition that the circuit between the pipeline to be detected and the cathode protection power supply is disconnected is taken as the potential gradient data between the second reference electrode and the first reference electrode corresponding to the second potential acquisition recorder, since the potential gradient data collected in the case of a circuit disconnection between the pipe to be tested and the cathodic protection power supply can be generally generated by electrical signal interference of other signal sources in the soil, therefore, by acquiring potential gradient data between the second reference electrode and the first reference electrode in the power-on and power-off states, the influence of stray current interference can be effectively reduced, and the detection accuracy is improved.
For example, the control device may determine the defect equivalent diameter d corresponding to each second potential collecting recorder according to the following formula.
dk＝(φ1-φ2)/(Eon-Eoff)
Wherein phi is1Can be the value of the potential gradient data collected under the condition that the circuit between the pipeline to be measured and the cathodic protection power supply is disconnected, phi2Can be the value of potential gradient data collected under the condition of circuit communication between the pipeline to be tested and the cathode protection power supply, EonCan be an energizing potential, EoffMay be a power-off potential and k may be a constant.
In one possible implementation, as shown in fig. 1, the system for detecting the corrosion protection layer defect of the buried pipeline in the nuclear power plant may further include: a fourth reference electrode 10, a plurality of third reference electrodes 13, a plurality of third potential acquisition recorders 11, and a plurality of distance sensors 12; each third reference electrode 13 is connected to the fourth reference electrode 10, and a plurality of third reference electrodes 13;
a distance sensor 12 is connected between each third reference electrode 13 and the fourth reference electrode 10, and the distance sensor 12 is used for acquiring distance data between the third reference electrode 13 and the fourth reference electrode 10;
a third potential acquisition recorder 11 is connected between each third reference electrode 13 and the fourth reference electrode 10, and the third potential acquisition recorder 11 is used for acquiring potential gradient data between the third reference electrode 13 and the fourth reference electrode 10;
the controller is respectively connected with each third electric potential acquisition recorder 11 and each distance sensor 12, the controller acquires electric potential gradient data from each third electric potential acquisition recorder 11, and the controller acquires distance data from each distance sensor 12;
and the controller determines the position of the defect of the pipeline to be detected according to the potential gradient data and the distance data between the third reference electrodes 13 and the fourth reference electrodes 10.
For example, the controller may determine a corresponding relationship between each distance data and the potential gradient data, and determine whether a value of each potential gradient data exceeds a preset threshold (or whether a difference between the value of the potential gradient data and a mean value of the plurality of potential gradient data exceeds the preset threshold, which is not limited in the determination manner in the embodiments of the present disclosure).
FIG. 3 is a schematic illustration of a pipe defect localization curve shown in accordance with an exemplary embodiment. As shown in fig. 3, the controller may also show the correspondence between each distance data and potential gradient data on the display screen.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (10)
1. The utility model provides a buried pipeline anticorrosive coating defect detecting system of nuclear power plant, a serial communication port, buried pipeline anticorrosive coating defect detecting system of nuclear power plant includes: the device comprises a first reference electrode, a pipeline test pile, at least one second reference electrode, a first potential acquisition recorder, at least one second potential acquisition recorder and a controller;
one end of the pipeline testing pile is connected with a pipeline to be tested under the ground, the other end of the pipeline testing pile is connected with the first reference electrode, and the first reference electrode is arranged on the ground surface above the defect position of the pipeline to be tested;
the first potential acquisition recorder is connected in series between the pipeline test pile and the first reference electrode and is used for acquiring power-on potential data and power-off potential data of the pipeline to be tested;
each second reference electrode is arranged on the ground surface and surrounds the first reference electrode, and a second potential acquisition recorder is connected between each second reference electrode and the first reference electrode in series and is used for acquiring potential gradient data between the second reference electrode and the first reference electrode;
the controller is respectively connected with the first potential acquisition recorder and each second potential acquisition recorder, the controller can acquire power-on potential data and power-off potential data from the first potential acquisition recorder, and the controller can acquire potential gradient data from each second potential acquisition recorder;
and the controller determines the size of the defect of the pipeline to be detected according to the power-on potential data, the power-off potential data and the plurality of potential gradient data.
2. The nuclear power plant buried pipeline anticorrosive layer defect detection system according to claim 1, wherein the nuclear power plant buried pipeline anticorrosive layer defect detection system comprises a plurality of second reference electrodes, and the controller determines the defect size of the pipeline to be detected below each second reference electrode and the first reference electrode according to potential gradient data, outage potential data and energization potential data between the second reference electrode and the first reference electrode;
and the controller determines the size of the defect of the pipeline to be detected according to the sizes of the plurality of defects.
3. The nuclear power plant buried pipeline anticorrosive coating defect detection system according to claim 1, further comprising a first current breaker, a first trigger and a second trigger, wherein the first current breaker is used for controlling on-off of a circuit between the pipeline to be detected and a cathode protection power supply;
the first trigger is connected with the first current breaker, and the second trigger is connected with the first potential acquisition recorder;
the moment when the first trigger triggers the first current breaker to break a circuit between a pipeline to be tested and a cathode protection power supply is the same as the moment when the second trigger triggers the first potential acquisition recorder to acquire data;
the moment when the first trigger triggers the first current breaker to be communicated with a circuit between a pipeline to be tested and a cathode protection power supply is the same as the moment when the second trigger triggers the first potential acquisition recorder to acquire data.
4. The nuclear power plant buried pipeline anticorrosive coating defect detection system according to claim 1, further comprising a second current breaker, a third trigger and at least one fourth trigger, wherein the second current breaker is used for controlling the on-off of a circuit between the pipeline to be detected and a cathode protection power supply;
the third triggers are connected with the second current breakers, and each fourth trigger is connected with a second potential acquisition recorder;
the moment when the third trigger triggers the second current breaker to break the circuit between the pipeline to be tested and the cathode protection power supply is the same as the moment when each fourth trigger triggers the corresponding second potential acquisition recorder to acquire data;
the moment when the third trigger triggers the second current breaker to be communicated with the circuit between the pipeline to be tested and the cathode protection power supply is the same as the moment when each fourth trigger triggers the corresponding second potential acquisition recorder to acquire data.
5. The nuclear power plant buried pipeline anticorrosive coating defect detection system according to claim 4, wherein the controller determines potential gradient data between a second reference electrode corresponding to each second potential acquisition recorder and the first reference electrode according to potential gradient data acquired by each second potential acquisition recorder under the condition that a circuit between the pipeline to be detected and the cathodic protection power supply is disconnected and potential gradient data acquired by each second potential acquisition recorder under the condition that the circuit between the pipeline to be detected and the cathodic protection power supply is communicated.
6. The nuclear power plant buried pipeline anticorrosive layer defect detection system according to claim 1, wherein the nuclear power plant buried pipeline anticorrosive layer defect detection system further comprises: the fourth reference electrode, a plurality of third reference electrodes, a plurality of third potential acquisition recorders and a plurality of distance sensors;
each third reference electrode is connected to the fourth reference electrode, and a plurality of third reference electrodes;
a distance sensor is connected between each third reference electrode and the fourth reference electrode and is used for acquiring distance data between the third reference electrode and the fourth reference electrode;
a third potential acquisition recorder is connected between each third reference electrode and the fourth reference electrode, and the third potential acquisition recorder is used for acquiring potential gradient data between the third reference electrode and the fourth reference electrode;
the controller is respectively connected with each third potential acquisition recorder and each distance sensor, acquires potential gradient data from each third potential acquisition recorder, and acquires distance data from each distance sensor;
and the controller determines the position of the defect of the pipeline to be detected according to the potential gradient data and the distance data between the third reference electrodes and the fourth reference electrodes.
7. The nuclear power plant buried pipeline anticorrosive layer defect detection system according to claim 1, comprising a plurality of second reference electrodes, wherein distances between each second reference electrode and the first reference electrode are completely the same, partially the same or completely different.
8. The nuclear power plant buried pipeline corrosion protection layer defect detection system according to claim 1, comprising a plurality of second reference electrodes, each second reference electrode uniformly surrounding the first reference electrode.
9. The nuclear power plant buried pipeline anticorrosive layer defect detection system according to claim 1, characterized in that the nuclear power plant buried pipeline anticorrosive layer defect detection system includes a plurality of second reference electrodes, each second reference electrode and the first reference electrode are in a linear arrangement.
10. The nuclear power plant buried pipeline anticorrosive coating defect detection system of claim 1, wherein the first reference electrode faces the axis of the pipeline to be detected.
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| CN114527161A (en) * | 2022-04-21 | 2022-05-24 | 国机传感科技有限公司 | Potential gradient measuring system |
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