CN110596204A - Method and system for detecting damage condition of lining glue layer of pipeline of nuclear power station - Google Patents
Method and system for detecting damage condition of lining glue layer of pipeline of nuclear power station Download PDFInfo
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- CN110596204A CN110596204A CN201910881757.9A CN201910881757A CN110596204A CN 110596204 A CN110596204 A CN 110596204A CN 201910881757 A CN201910881757 A CN 201910881757A CN 110596204 A CN110596204 A CN 110596204A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/20—Investigating the presence of flaws
- G01N27/205—Investigating the presence of flaws in insulating materials
Abstract
The invention relates to the technical field of pipeline detection, in particular to a method and a system for detecting the damage condition of a lining glue layer of a pipeline of a nuclear power station, wherein the detection method comprises the following steps: applying a detection electric signal between the pipe wall of the pipeline to be detected and the carrying liquid in the pipe to obtain a current value between the pipe wall and the carrying liquid in the pipe; and calculating the insulation resistance value of the unit length of the pipeline to be detected according to the detection electric signal and the current value, and obtaining the damage grade of the pipeline to be detected according to the insulation resistance value. Can obtain the damaged condition of pipeline inside lining glue film like this under the condition of not taking apart the pipeline, compare with the current method of taking apart partial pipeline and detecting or directly changing, it is more convenient to detect, has practiced thrift the pipeline cost simultaneously. By adopting the method, the pipeline does not need to be replaced regularly, the condition that the pipeline which can be used continuously is replaced, the pipeline resource is wasted is avoided, and the aims of energy conservation, emission reduction and environmental protection are fulfilled.
Description
Technical Field
The invention relates to the technical field of nuclear power station pipeline detection, in particular to a method and a system for detecting the damage condition of a lining glue layer of a nuclear power station pipeline.
Background
The pipeline generally plays a role in liquid transportation in industrial production, and for example, a rubber-lined pipeline is used for conveying a strong corrosive medium in the fields of nuclear power plants, chemical industry and the like. When a nuclear power station works, a rubber lining pipeline is usually adopted to convey seawater, elements such as sodium chloride and the like contained in the seawater have a corrosive effect on a rubber lining layer in the pipeline, and therefore the damage condition of the rubber lining layer of the pipeline needs to be detected continuously. At present, the rubber-lined pipeline has no special detection means, and the main factor influencing the service life of the rubber-lined pipeline lies in the working state of the rubber-lined layer, if the rubber-lined layer is intact, the service life of the outer-layer steel pipe can be hardly influenced by the service environment. And the working state of the lining glue layer can not be observed visually or detected by a simple instrument due to the physical isolation, so that the running state of the whole pipeline can not be controlled. At present, the operation and maintenance strategy of the pipeline system in the field of nuclear power stations is usually to replace the pipeline system until the design life is reached; or the lining glue layer is inspected by disassembling part of the pipeline; the method can not detect the damage condition of the lining glue layer of the pipeline in advance, a large amount of cost is needed to replace the pipeline directly or disassemble part of the pipeline to check the condition of the lining glue layer, and meanwhile, if the lining glue layer is damaged seriously but the pipeline is not replaced in time, great potential safety hazards exist, seawater transportation of the nuclear power station is influenced, and further the normal state of the nuclear power station is influenced.
Disclosure of Invention
In order to solve the technical problem that the damage condition of a lining glue layer of a pipeline in the prior art cannot be detected, the application provides a method and a system for detecting the damage condition of the lining glue layer of the pipeline of a nuclear power station.
A method for detecting the damage condition of a lining glue layer of a pipeline comprises the following steps:
applying a detection electric signal between the pipe wall of the pipeline to be detected and the carrying liquid in the pipe to obtain a current value between the pipe wall and the carrying liquid in the pipe;
and calculating the insulation resistance value of the unit length of the pipeline to be detected according to the detection electric signal and the current value, and obtaining the damage grade of the pipeline to be detected according to the insulation resistance value.
Wherein, the calculating the insulation resistance value of the pipeline to be measured in unit length according to the current value comprises:
calculating the insulation resistance value F of the pipeline to be measured in unit length according to the following formula:
and the voltage value of the detection electric signal applied between the pipe wall of the pipeline to be detected and the in-pipe carrier liquid is delta V, the length of the pipeline to be detected is L, the inner diameter of the pipeline to be detected is D, and the current value between the pipe wall of the pipeline to be detected and the in-pipe carrier liquid is I.
Wherein, obtaining the damage grade of the pipeline to be tested according to the insulation resistance value comprises:
and after the insulation resistance value is obtained, obtaining the damage grade of the pipeline to be detected according to the corresponding relation between the preset insulation resistance value and the damage grade.
The corresponding relation between the preset insulation resistance value and the damage grade is obtained through a pipeline test model, and the pipeline test model comprises at least one section of simulation pipeline and electrodes arranged on the pipe wall of the simulation pipeline and in a pipeline cavity;
the inner lining glue layer of the simulation pipeline is preset with damage defects.
Wherein, the corresponding relation between the preset insulation resistance value and the damage grade is obtained through a pipeline test model and comprises:
introducing simulation liquid into the pipeline test model, and applying detection electric signals to the pipe wall of the simulation pipeline and the simulation liquid through the electrodes;
acquiring a current value between the pipe wall of the simulation pipeline and the simulation liquid, and calculating the insulation resistance value of the simulation pipeline in unit length according to the current value;
acquiring a corresponding relation between the damage defect and the insulation resistance value;
changing the damage defects, and repeating the steps to obtain insulation resistance values corresponding to a plurality of damage defects with different degrees respectively;
and dividing the damage defect into a plurality of damage grades according to the damage degree, and acquiring the corresponding relation between the insulation resistance value and the damage grade.
Wherein the voltage of the detection electric signal is 24-48V, and the frequency is 3-16 Hz.
The utility model provides a damaged condition detecting system of nuclear power station pipeline inside lining glue film, includes:
the electrode is used for applying a detection electric signal between the pipe wall of the pipeline to be detected and the bearing liquid in the pipe;
the current detection device is used for acquiring a current value between the pipe wall and the bearing liquid in the pipe;
the input device is used for inputting the length and the inner diameter of the pipeline to be detected;
the processor is used for calculating the insulation resistance value of the pipeline to be detected according to the current value, the length and the inner diameter of the pipeline to be detected and the voltage value of the detection electric signal, and obtaining the damage grade of the pipeline to be detected according to the insulation resistance value;
and a display device for displaying the detected damage level.
Wherein, calculating the insulation resistance value of the pipeline to be detected according to the current value, the length and the inner diameter of the pipeline to be detected and the voltage value of the detection electric signal, and obtaining the damage grade of the pipeline to be detected according to the insulation resistance value comprises the following steps:
calculating the insulation resistance value F of the pipeline to be tested in unit length according to the following formula, and obtaining the damage grade of the pipeline to be tested according to the corresponding relation between the preset insulation resistance value and the damage grade;
and the voltage value of the detection electric signal applied between the pipe wall of the pipeline to be detected and the in-pipe carrier liquid is delta V, the length of the pipeline to be detected is L, the inner diameter of the pipeline to be detected is D, and the current value between the pipe wall of the pipeline to be detected and the in-pipe carrier liquid is I.
The current detection device is a current detector or a milliammeter.
Wherein, the display device is a display screen.
According to the method and the system for detecting the damage condition of the lining glue layer of the nuclear power station pipeline, a proper detection electric signal is applied between the pipe wall of the pipeline to be detected and the bearing liquid in the pipe to obtain the current value between the pipe wall and the bearing liquid in the pipe, then the insulation resistance value of the unit length of the pipeline to be detected is calculated through the current value, and then the damage grade of the pipeline to be detected is obtained according to the insulation resistance value.
Drawings
FIG. 1 is a flow chart of a detection method according to an embodiment of the present application;
FIG. 2 is a flowchart of a method for obtaining a corresponding relationship between insulation resistance and damage level according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a pipeline test model according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating an arrangement of electrodes on a pipe to be tested according to an embodiment of the present application;
fig. 5 is a block diagram of a detection system according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In the embodiment of the invention, the method for detecting the damage condition of the existing commonly-used pipeline with the lining glue layer is provided, and is mainly used for detecting the damage condition of the lining glue layer, and the main factor influencing the service life of the pipeline is the working state of the lining glue layer, for example, the lining glue layer is intact, and the service life of the outer-layer steel pipe can be hardly influenced by the service environment. And the working state of the lining glue layer can not be observed visually or detected by a simple instrument due to physical isolation, so that the running state of the whole pipeline can not be controlled. The operation and maintenance strategy of the pipeline system is usually to replace the pipeline system until the design life; or part of pipelines are disassembled to check the condition of the lining glue layer; or directly carrying out ultrasonic thickness measurement on the outer wall steel pipe, and carrying out corresponding treatment after the data condition is obtained, wherein the methods can not directly master the state of the lining rubber layer, and have great potential safety hazard, the pipeline is provided with a layer of lining rubber layer on the inner pipe wall, so that the inner wall of the pipeline is insulated. Compared with the existing method for observing by disassembling the pipeline, the method is more convenient and saves the detection cost.
The first embodiment is as follows:
referring to fig. 1, the present embodiment provides a method for detecting a damage condition of a lining layer of a pipeline of a nuclear power plant, where, in the present embodiment, a pipeline for transporting seawater in an electric field is taken as an example, and the method is described, where a layer of lining layer is disposed on an inner wall of the pipeline for transporting seawater, the pipeline is formed by a plurality of segments of sub-pipelines which are communicated with each other through flanges, and the flanges are connected through at least 8 groups of bolts, so that a resistance between the flanges can be reduced, and the method includes:
step 101: and applying a detection electric signal between the pipe wall of the pipeline to be detected and the carrying liquid in the pipe to obtain a current value between the pipe wall and the carrying liquid in the pipe. Wherein, bearing liquid is the sea water among the prior art, the main component that contains is sodium chloride, the sea water can corrode the inside lining glue film of pipeline, make the inside lining glue film of pipeline damaged, the pipeline sets up in the sea water in the work one end, be equipped with filtering ponds and water pump in the sea water generally, the water pump communicates with pipeline, as shown in fig. 4, when exerting the detection signal of telecommunication to the pipeline that awaits measuring, can apply an electrode D to the outer pipe wall of pipeline 51 that awaits measuring, for example can be connected to pipeline one end and be used for the bolt of flange, another electrode C is applied to the sea water in the pipeline 51 that awaits measuring, for example can set up another electrode C in the filtering ponds, because the electric conductivity of sea water, make the sea water in the filtering ponds and the sea water voltage in the pipeline the. After a plurality of tests, the applied detection electric signal is an alternating current voltage signal, the voltage of the general detection signal is generally 24-48V, and when the frequency of the detection electric signal is selected to be 3-16Hz, the stability of the detection electric signal is better, and the interference with other on-site electric equipment can be avoided, and the experiment shows that the larger the sum of the internal surface areas of the pipeline to be detected is, the lower the frequency to be selected is. And measuring the current value between the outer pipe wall and the seawater in the pipe by adopting an ammeter or a milliammeter. The seawater corrosion pipeline body belongs to typical electrochemical corrosion and can be generated only by free electron exchange between the pipeline body and seawater, so that the insulation resistance value measured by the method can directly reflect the damage condition of the lining glue layer of the pipeline, and whether the pipeline is corroded can be directly judged.
Step 102: and calculating the insulation resistance value of the unit length of the pipeline to be detected according to the detection electric signal and the current value, and obtaining the damage grade of the pipeline to be detected according to the insulation resistance value. In this embodiment, the damage level of the pipeline to be tested is obtained by obtaining the insulation resistance value of the pipeline to be tested per unit length. Specifically, the insulation resistance value F of the unit length of the pipeline to be measured is calculated by the following formula:
wherein, Δ V is the voltage of the detection electrical signal applied between the pipe wall of the pipe to be detected and the seawater in the pipe, L is the length of the pipe to be detected, D is the inner diameter of the pipe to be detected, and I is the current value between the pipe wall of the pipe to be detected and the seawater in the pipe. In order to prepare the measurement result, the measurement result can be measured by respectively adopting detection electric signals with different voltages and frequencies, the voltage and the current value of the detection electric signal measured each time are respectively and correspondingly recorded, a plurality of insulation resistance values are obtained through calculation of the formula, then the average value of the obtained insulation resistance values is obtained, and the damage grade of the pipeline to be measured is obtained according to the average value.
The method comprises the steps of obtaining a corresponding relation between an insulation resistance value and a damage grade of a pipeline through a simulation experiment in advance through a pipeline model, and obtaining the damage grade of a pipe to be detected by referring to the corresponding relation between the insulation resistance value and the damage grade when an average value is obtained according to a plurality of insulation resistance values.
In this embodiment, the correspondence between the insulation resistance value and the damage level of the pipe is obtained by a pipe test model. Wherein, as shown in fig. 3, the pipeline test model includes a plurality of sections of simulation pipelines 42, the plurality of sections of simulation pipelines 42 are connected through a first flange 43, the model further includes an electrode a arranged on the outer pipe wall of the simulation pipeline 42 and an electrode B arranged in the cavity of the pipeline, a water pump is further arranged at one end of the simulation pipeline 42 for extracting the simulation liquid, a damage defect is preset on the inner liner glue layer of the simulation pipeline 42, the size (damage degree) of the damage defect is measured by the damage area, and the larger the damage area is, the more serious the damage degree is represented. The pipe diameter, the length and the pipe distance of the simulated pipe 42 are manufactured according to a certain proportion according to an actual pipe to be measured, for example, the pipe diameter of the simulated pipe 42 is half or one third of the pipe diameter of the actual pipe to be measured, the pipe length of the simulated pipe 42 (which can also be considered as the distance between two flanges) is half or one third of the pipe length of the actual pipe to be measured, the specific parameters of the pipe test model designed in the embodiment are as follows, and artificial defects with the same area are preset on the lining glue layer of the inner wall of each pipe.
TABLE 1
As shown in fig. 2, the method for obtaining the corresponding relationship between the insulation resistance value and the damage level through the pipeline test model includes:
step 201: introducing simulation liquid into the pipeline test model, and applying detection electric signals to the pipe wall of the simulation pipeline 42 and the simulation liquid through electrodes; in the embodiment, in order to simulate that the simulation solution introduced into the seawater is 4% naci solution, as shown in fig. 3, one end of the simulation pipeline 42 is communicated with the solution storage tank 41, and a water pump on the simulation pipeline 42 is used for introducing 4% NaCl solution in the solution storage tank 41 into the simulation pipeline 42, so as to form a circulation loop. The detection electric signals are applied to the simulation pipelines of the 9 groups of test models in the upper table through electrodes arranged on the outer pipe wall of the simulation pipeline 42 and in the cavity of the pipeline, specifically, the electrode A can be connected to a bolt of the first flange 43, the electrode B is arranged at a position close to the simulation pipeline 42 in the solution storage tank 41, the selection voltage is 24V, and the detection electric signals with the frequencies of 3HZ, 16HZ and 512HZ are respectively connected.
Step 202: acquiring a current value between the pipe wall of the simulation pipeline 42 and the simulation liquid, and calculating the insulation resistance value of the simulation pipeline 42 in unit length according to the current value; the current between the pipe wall and the simulation liquid is respectively measured, the corresponding current is calculated according to the current value conversion multiple corresponding to the pipeline test model of the specification, the insulation resistance value of the simulation pipeline 42 at the position is calculated according to the voltage values of the multiple groups of applied detection electric signals and the corresponding current values obtained through conversion, and the obtained insulation resistance values are averaged to obtain the insulation resistance value.
Step 203: acquiring a corresponding relation between the damage defect and the insulation resistance value; and acquiring the corresponding relation between the insulation resistance value obtained by averaging and the preset damage defect.
Step 204: changing the damage defects, and repeating the steps to obtain insulation resistance values corresponding to a plurality of damage defects with different degrees respectively; namely, the damaged area of the lining glue layer of the analog pipeline 42 is changed, and the insulation resistance value corresponding to the damaged area is obtained by the method, so that the insulation resistance values corresponding to different damage degrees are obtained respectively.
Step 205: dividing the damage defect into a plurality of damage grades according to the damage degree, and acquiring the corresponding relation between the insulation resistance value and the damage grade; in this embodiment, the damage defect is divided into five levels according to the common damage degree, and the insulation resistance corresponding to each damage level is obtained, as shown in table 2 below:
TABLE 2
The smaller the insulation resistance value is, the higher the corresponding damage level is, the more serious the damage level is, specifically, when the detected damage level is 1 level, the damage level of the lining rubber layer is relatively light, the lining rubber layer can be continuously used, when the detected damage level is 2 level, the lining rubber layer is damaged to a certain extent, the lining rubber layer can be used under the monitoring condition, for example, the damage condition of the lining rubber layer is detected once per week, and the regular monitoring is carried out; when the detected damage grade is grade 3, the detected damage grade indicates that the damage degree of the lining glue layer reaches the critical point needing to be maintained, and maintenance time needs to be planned for maintenance; when the detected damage grade is 4 grade, the damage degree of the lining glue layer is serious, and immediate maintenance is needed; when the detected damage grade is 5 grade, the damage degree of the lining rubber layer reaches the scrapping degree and needs to be replaced immediately.
The corresponding relation between the damage grade and the insulation resistance is obtained through the method, the damage grade of the pipeline to be detected is obtained according to the corresponding relation after the insulation resistance of the pipeline to be detected is obtained during actual detection, and then a worker confirms whether the pipeline needs to be replaced according to the damage grade. Through the detection method of this embodiment, can obtain the damaged condition of the pipeline inside lining glue film that awaits measuring under the condition that does not unpack apart the pipeline and need not shut down the parking, detection efficiency is higher and the cost is littleer, whether need change the pipeline according to the damaged degree decision that detects the acquisition, like this can make full use of the life-span of pipeline, compare with the current mode that reaches the settlement year and all change promptly, avoid causing the waste, practice thrift the cost more, avoid simultaneously because the potential safety hazard that the pipeline damage arouses.
Example 2
The embodiment provides a system for detecting the damage condition of a lining glue layer of a pipeline, which is mainly used for detecting the damage condition of the lining glue layer of the pipeline containing the lining glue layer, and comprises an electrode 303, a current detection device 306, an input device 307, a display device 304 and a processor 301, wherein the electrode 303 is connected with a power supply device 302 and is used for applying a detection electric signal between the pipe wall of the pipeline to be detected and a carrier liquid in the pipe, and the processor 301 is connected with the power supply device so as to adjust the voltage and the frequency of the applied detection telecommunication signal by controlling the power supply device 302; during measurement, one end of the electrode 303 is arranged on a bolt used for communicating a flange of the pipeline to be measured, and the other end of the electrode is arranged in a cavity of the pipeline to be measured and electrically connected with liquid circulating in the cavity, so that the two electrodes form an electric loop through the pipeline. The current detection device 306 is used for acquiring a current value between the pipe wall of the pipeline to be detected and the bearing liquid in the pipe and sending the acquired current value to the processor 301; the input device 307 is connected with the processor 301 and is used for inputting the length and the inner diameter information of the pipeline to be measured; the processor 301 is configured to calculate an insulation resistance value of the pipe to be tested according to the current value, the length and the inner diameter of the pipe to be tested, and the voltage value of the detection electrical signal, and obtain a damage level of the pipe to be tested according to the insulation resistance value; the display device 304 is connected to the processor 301, and displays the damage level detected by the processor 301 in real time.
Further, in other embodiments, the system further includes a storage module 305, where the storage module 305 stores a corresponding relationship between the insulation resistance value and the damage level of the pipeline in advance, and after the processor 301 calculates the insulation resistance value of the pipeline to be tested, the processor retrieves the corresponding relationship stored in the storage module 305 for comparison and query, so as to obtain the damage level of the pipeline to be tested.
Wherein, the corresponding relation between insulation resistance value and the damaged grade of pipeline obtains through pipeline test model, and this pipeline test model includes at least one section simulation pipeline and sets up the electrode on simulation pipeline outer pipe wall and in the pipeline cavity, still is equipped with the water pump in simulation pipeline one end for the extraction of simulation liquid, presets damaged defect on the inside lining glue film of simulation pipeline, and the size (damaged degree) of damaged defect is measured with damaged area, and damaged area is big more to show that damaged degree is more serious. The pipe diameter, the length and the pipe interval of the simulated pipe are all manufactured according to a certain proportion according to the actual pipe to be measured. The specific method for obtaining the corresponding relationship between the insulation resistance value and the damage level of the pipeline through the pipeline test model is the same as that in embodiment 1, and details are not repeated here.
Wherein, processor 301 calculates the insulation resistance value of the pipeline to be tested according to the current value, the length and the inner diameter of the pipeline to be tested, and the voltage value of the detection electrical signal, and obtains the damage grade of the pipeline to be tested according to the insulation resistance value includes:
the processor 301 calculates the insulation resistance value F of the unit length of the pipeline to be tested according to the following formula, and obtains the damage grade of the pipeline to be tested according to the corresponding relation between the insulation resistance value preset in the storage module and the damage grade;
wherein, Δ V is the voltage of the detection electrical signal applied between the pipe wall of the pipe to be tested and the liquid bearing liquid in the pipe, L is the length of the pipe to be tested, D is the inner diameter of the pipe to be tested, and I is the current value between the pipe wall of the pipe to be tested and the liquid bearing liquid in the pipe.
The storage module 305 may be a memory card or a hard disk, and the like, in which a corresponding relationship between the insulation resistance value and the pipeline damage level shown in table 2 in embodiment 1 is prestored, and the processor 301 refers to the corresponding relationship according to the calculated insulation resistance value, that is, the available damage level of the pipeline to be tested, and displays the damage level in real time through the display device 304.
The current detection device 306 in the system can be a current detector or a milliammeter, and the display device 304 is an industrial liquid crystal display screen, such as an OLED display screen; the input device 307 may be a numeric keypad. Or a display screen with a touch screen input function is selected, and the length and the inner diameter parameters of the pipeline to be tested can be manually input by matching with a handwriting pen.
Furthermore, the detection system can be arranged on the pipeline to be detected for a long time, and the damage grade information detected by the processor is sent to a remote monitoring room through a cable or a wireless network, so that the remote real-time online monitoring of the pipeline can be realized, the damage condition of the pipeline can be mastered at any time, the pipeline can be replaced in time, and the leakage accident can be avoided. By adopting the system, workers do not need to disassemble the pipeline for detection, the working difficulty is reduced, the detection cost is greatly reduced, the pipeline does not need to be replaced regularly by adopting the method, the situation that the pipeline which can be used continuously is replaced, the pipeline resource is wasted is avoided, and the aims of energy conservation, emission reduction and environmental protection are fulfilled.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A nuclear power station pipeline lining glue layer damage condition detection method is characterized by comprising the following steps:
applying a detection electric signal between the pipe wall of the pipeline to be detected and the carrying liquid in the pipe to obtain a current value between the pipe wall and the carrying liquid in the pipe;
and calculating the insulation resistance value of the unit length of the pipeline to be detected according to the detection electric signal and the current value, and obtaining the damage grade of the pipeline to be detected according to the insulation resistance value.
2. The method as claimed in claim 1, wherein said calculating an insulation resistance value per unit length of the pipe to be tested based on the current value comprises:
calculating the insulation resistance value F of the pipeline to be measured in unit length according to the following formula:
and the voltage value of the detection electric signal applied between the pipe wall of the pipeline to be detected and the in-pipe carrier liquid is delta V, the length of the pipeline to be detected is L, the inner diameter of the pipeline to be detected is D, and the current value between the pipe wall of the pipeline to be detected and the in-pipe carrier liquid is I.
3. The method as claimed in claim 1, wherein obtaining the damage level of the pipe to be tested according to the insulation resistance value comprises:
and after the insulation resistance value is obtained, obtaining the damage grade of the pipeline to be detected according to the corresponding relation between the preset insulation resistance value and the damage grade.
4. The detection method according to claim 3, wherein the corresponding relationship between the preset insulation resistance value and the damage level is obtained through a pipeline test model, and the pipeline test model comprises at least one section of simulated pipeline and electrodes arranged on the wall of the simulated pipeline and in the cavity of the pipeline;
the inner lining glue layer of the simulation pipeline is preset with damage defects.
5. The method as claimed in claim 4, wherein the step of obtaining the corresponding relationship between the predetermined insulation resistance and the damage level through a pipeline test model comprises:
introducing simulation liquid into the pipeline test model, and applying detection electric signals to the pipe wall of the simulation pipeline and the simulation liquid through the electrodes;
acquiring a current value between the pipe wall of the simulation pipeline and the simulation liquid, and calculating the insulation resistance value of the simulation pipeline in unit length according to the current value;
acquiring a corresponding relation between the damage defect and the insulation resistance value;
changing the damage defects, and repeating the steps to obtain insulation resistance values corresponding to a plurality of damage defects with different degrees respectively;
and dividing the damage defect into a plurality of damage grades according to the damage degree, and acquiring the corresponding relation between the insulation resistance value and the damage grade.
6. The detection method according to claim 1 or 5, wherein the voltage of the detection electric signal is 24-48V and the frequency is 3-16 Hz.
7. The utility model provides a nuclear power station pipeline inside lining glue film damage condition detecting system which characterized in that includes:
the electrode is used for applying a detection electric signal between the pipe wall of the pipeline to be detected and the bearing liquid in the pipe;
the current detection device is used for acquiring a current value between the pipe wall and the bearing liquid in the pipe;
the input device is used for inputting the length and the inner diameter of the pipeline to be detected;
the processor is used for calculating the insulation resistance value of the pipeline to be detected according to the current value, the length and the inner diameter of the pipeline to be detected and the voltage value of the detection electric signal, and obtaining the damage grade of the pipeline to be detected according to the insulation resistance value;
and a display device for displaying the detected damage level.
8. The inspection system of claim 7, wherein calculating an insulation resistance value of the pipe under test from the current value, the length and inner diameter of the pipe under test, and the voltage value of the inspection electrical signal, and obtaining a damage level of the pipe under test from the insulation resistance value comprises:
calculating the insulation resistance value F of the pipeline to be tested in unit length according to the following formula, and obtaining the damage grade of the pipeline to be tested according to the corresponding relation between the preset insulation resistance value and the damage grade;
and the voltage value of the detection electric signal applied between the pipe wall of the pipeline to be detected and the in-pipe carrier liquid is delta V, the length of the pipeline to be detected is L, the inner diameter of the pipeline to be detected is D, and the current value between the pipe wall of the pipeline to be detected and the in-pipe carrier liquid is I.
9. The detection system of claim 7, wherein the current detection device is a current detector or a milliamp meter.
10. The detection system of claim 7, wherein the display device is a display screen.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114152648A (en) * | 2021-12-15 | 2022-03-08 | 无锡市智控科技有限公司 | Glass lining online damage detection device and detection method thereof |
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| CN117036347A (en) * | 2023-10-08 | 2023-11-10 | 山东柯林瑞尔管道工程有限公司 | Visual detection method and system for pipeline lining leakage based on image enhancement |
| CN117036347B (en) * | 2023-10-08 | 2024-02-02 | 山东柯林瑞尔管道工程有限公司 | Visual detection method and system for pipeline lining leakage based on image enhancement |
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