CN118090906B - On-line monitoring method and device for fuel gas pipeline in key area - Google Patents
On-line monitoring method and device for fuel gas pipeline in key area Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention discloses an on-line monitoring method and device for a fuel gas pipeline in a key area, which belong to the technical field of inspection and detection, and comprise a plurality of phased array probes which are arranged on the outer side wall of the fuel gas pipeline and used for scanning pipeline defects, wherein the phased array probes are simultaneously connected with a data converter in a communication manner, the data converters are positioned on a control host and are in data communication with each other, the control host is connected with a monitoring management platform in a communication manner, and the monitoring management platform is connected with a user terminal in a communication manner; the control host comprises a control module for controlling the phased array probe to scan defects; the storage module is used for storing various data related to the phased array probe; and the network module is used for communicating with the monitoring management platform. The invention is used for solving the problems that the gas pipeline has high detection cost, the defects of the gas pipeline can not be monitored on line, the defects can not be searched in time, and early warning can not be performed in advance.
Description
Technical Field
The invention belongs to the technical field of inspection and detection, and particularly relates to an on-line monitoring method and device for a fuel gas pipeline in a key area.
Background
The gas pipeline is a channel for conveying gas fuel such as natural gas, liquefied petroleum gas, artificial gas and the like, and along with the complexity and the scale of a gas pipeline system, the risk of safety accidents caused by gas leakage is continuously increased, particularly in key areas with dense buildings and dense people flows, once gas leakage or pipeline accidents occur, the consequences are not envisaged, so that timely detection of defects is important for preventing accidents and guaranteeing public safety.
The leakage reasons of the gas pipeline mainly comprise pipeline corrosion, welding defects, external damage and the like. In order to effectively prevent accidents and control the expansion of the accident situation, it is particularly important to monitor pipeline defects in real time. However, existing monitoring methods have some limitations. For example, periodic manual excavation and inspection methods can suffer from missed inspection problems, which are time consuming and labor costly; although the method for collecting data by the installation sensor can judge whether leakage occurs, the method can not directly detect the pipeline body and can not realize pre-warning.
Therefore, the method and the device for on-line monitoring of the pipeline defects can be provided for the gas pipeline in the key area.
Disclosure of Invention
Aiming at the problems, the invention provides an on-line monitoring method and device for a gas pipeline in a key area, which are used for solving the problems that the gas pipeline is high in detection cost, defects of the gas pipeline cannot be monitored on line, the defects cannot be searched in time, and early warning cannot be performed in advance.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The utility model provides an on-line monitoring device of key area gas pipeline, includes a plurality of phased array probes that are arranged on the gas pipeline lateral wall and are used for scanning pipeline defect, and a plurality of phased array probes are communication connection in data converter simultaneously, and data converter is located on the control host computer, and data communication each other, and control host computer communication connection monitors the management platform, monitors the management platform communication connection user terminal;
the control host comprises a control module for controlling the phased array probe to scan defects;
the storage module is used for storing various data related to the phased array probe;
and the network module is used for communicating with the monitoring management platform.
As a further improvement of the scheme, the monitoring management platform comprises a data analysis module, a detection module and a detection module, wherein the data analysis module is used for grading defects scanned by the phased array probe, establishing defect files of the phased array probe at different positions and sending out early warning information;
the early warning module is used for receiving the early warning information and sending out early warning;
and the display module is used for displaying the defect file information and facilitating data calling and display.
A method for monitoring a gas pipeline by a gas pipeline on-line monitoring device in a key area comprises the following steps:
Step 1: the method comprises the steps of hardware arrangement, platform construction and basic defect detection, wherein a phased array probe is connected during gas pipeline installation, a control host is connected, after each function test of a system is completed, the phased array probe carries out omnibearing detection on the gas pipeline for the first time, and the defect which is allowed to exist in a standard range and has dangerous hidden danger and the position of the defect are judged and assessed to be used as basic defect data, and the phased array probe is installed at the position of the basic defect so as to monitor the basic defect;
Step 2: presetting defect grading grades in a monitoring management platform, presetting corresponding alarm information of different grades, and presetting interval detection time;
step 3: after reaching the preset detection time, the control host controls the phased array probe to perform defect scanning, detects whether the defects are enlarged, changes the scanning angle and the scanning range of the phased array probe, detects whether derivative defects exist around the phased array probe, stores data of defect scanning, and sends the data to the monitoring management platform for analysis;
Step 4: after the monitoring management platform receives the data sent by the control host, comparing the detected data with basic defect data, grading the received data according to the compared conditions, establishing a defect file at the position, and sending early warning information according to the grading result, wherein the early warning information can be directly displayed on the monitoring management platform or transmitted to a user terminal so as to remind a worker to overhaul and correspondingly treat the pipeline.
As a further improvement of the above scheme, in step 4, when the monitoring management platform performs data comparison, the echo amplitude of the compared image data is mainly compared;
and classifying and transmitting the early warning information according to the following conditions:
when the received echo amplitude is 0% -40%, judging the grade as an acceptable defect, and setting an early warning mode as no early warning;
when the received echo amplitude is 40% -80%, judging the grade as a focus defect, setting an early warning mode as an early warning prompt, and setting the detection time of a secondary detection interval;
when the received echo amplitude is 80% or more, judging the grade as defect to be processed, and setting an early warning mode as continuous warning until the defect is solved. .
As a further improvement of the scheme, when the difference between the echo amplitude of the scanned defect and the echo amplitude of the scanned defect is larger than 6dB, the phased array probe changes the focusing rule of the phased array probe so as to change the scanning angle and the scanning range of the phased array probe and detect the derivative defect.
As a further improvement of the above solution, the secondary detection interval time set in the early warning mode after grading in step 4 is T, and the calculation mode is as follows: Wherein: For the last time of the interval detection, In order for the attenuation coefficient to be a factor,Is the defect echo amplitude.
As a further improvement of the above solution, it is also necessary to calculate and compare in step 4 the rate of expansion (V) of the defect:
The calculation method is as follows: v= (A2-A1)/T 0
Wherein A2 is the detected amplified defect echo amplitude, and A1 is the defect echo amplitude before detection;
The calculated expansion rate is then used to calculate the time (T1) required for the defect echo amplitude to reach 80%, namely:
T1=（80%-A2）/V；
And comparing T1 with T, and selecting the minimum time value as the detection interval time.
As a further improvement of the scheme, in step 3, the data converter is provided with a plurality of signal interfaces which are communicated with the phased array probe;
The control host automatically detects a signal interface connected with the phased array probe, assigns an address label to the accessed signal interface, transmits the address label to the monitoring management platform, pops up the position coordinate of the corresponding phased array probe which the address label needs to be input on the monitoring management platform, the coordinate system is one-dimensional linear coordinate, and the coordinate of the first input phased array probe is defaulted to be the origin.
As a further improvement of the scheme, the mode of controlling the phased array probe to start detection by the control host is divided into single detection and mixed detection;
the single detection is to perform starting detection step by step according to the coordinate position of the phased array probe;
The mixed detection is that a plurality of phased array probes are detected simultaneously and matched with a single phased array probe to detect step by step.
As a further improvement of the above scheme, the specific method of the mixing detection is as follows: the monitoring management platform calculates the distance between two adjacent phased array probes according to the established coordinate system, counts the number of the two adjacent phased array probes exceeding 100mm and corresponding address labels, divides the two phased array probes into simultaneous detection types, and enjoys the optimal priority of the detection started preferentially in the detection process; and the rest phased array probes which are adjacent and not more than 100mm are orderly provided with detection priority from small to large according to the coordinate direction and the coordinate distance, and the starting detection is carried out step by step.
Compared with the prior art, the invention has the beneficial effects that:
1. through arranging phased array probe on the gas pipeline, can realize the real-time supervision to the gas pipeline, can effectively master the defect position that gas pipeline can appear to carry out the early warning to the defect that has worsened, thereby realize the early warning to gas pipeline leakage, avoided because pipeline defect leads to appearing the circumstances that the risk such as gas leakage enlarges, especially to the gas pipeline in important areas such as dense pavement of population, tunnel, underground piping lane, can effectually ensure people's life and property safety.
2. According to the application, the phased array probe and the gas pipeline are arranged together, so that the startup detection can be performed within a certain period of time, the gas pipeline is prevented from being excavated, the monitoring cost is effectively saved, meanwhile, the damage to the pipeline in the excavation process is also avoided, the phased array probe is arranged at a plurality of positions of the pipeline, the integral monitoring of the pipeline can be effectively realized, and the existing defects can be rapidly and accurately identified by comprehensively checking the pipeline body and the welding seam area; by adjusting detection parameters of the phased array probe, the defect detection range can be enlarged, echo signals containing defect information, visual A-scan, S-scan, C-scan, D-scan and the like can be obtained, and the surrounding area of the target defect is detected to determine whether a new defect occurs; the design further improves the detection efficiency, ensures the comprehensiveness and the accuracy of the detection result, and realizes the maximum utilization of the ultrasonic phased array detector.
3. According to the application, the control host and the data converter can be used for carrying out data transmission on a plurality of phased array probes, so that one-machine-multiple-head monitoring can be realized, and a plurality of defect positions on a pipeline can be monitored. And the phased array probes at different positions are determined by establishing coordinates, so that synchronous start-up detection or single start-up detection of the phased array probes is realized, and the detection efficiency is improved.
4. According to the application, whether the tiny defects are seriously expanded or not can be judged by comparing the tiny defects with the historical data, whether the surrounding areas are new derivative defects or not is determined by changing the scanning range, powerful support is provided for pipeline maintenance and accident early warning, the detected data are subjected to grading treatment, and different early warning responses are carried out on the defects of different grades, so that the dangers of the defects can be evaluated, and the target defects needing to be focused are determined; compared with the traditional large-area detection method, the targeted detection mode remarkably reduces detection time and resource consumption.
Drawings
FIG. 1 is a schematic view of the overall structure of the device of the present invention;
FIG. 2 is a schematic diagram of a coordinate system established in the present invention;
FIG. 3 is a graph of scan results when the echo amplitude of the defect for the gas pipeline does not exceed 80%, wherein FIG. 3 (a) is an A-scan signal graph of the defect of the gas pipeline, and FIG. 3 (b) is an S-scan result graph of the defect of the gas pipeline;
FIG. 4 is a graph of scan results when the echo amplitude of a defect for a gas pipeline exceeds 80%, wherein FIG. 4 (a) is an A-scan signal graph of the defect of the gas pipeline, and FIG. 4 (b) is an S-scan result graph of the defect of the gas pipeline;
FIG. 5 is a schematic diagram of coverage of S-scan detection beams of a defect performed after the position of a phased array probe is fixed;
Fig. 6 is a schematic diagram of coverage of an S-scan detection beam for performing defects by expanding a scanning range after fixing a phased array probe in the present invention.
In the figure: 10. a phased array probe; 11. a control host; 12. monitoring and managing the platform; 13. a user terminal; 14. a data converter; 15. wedge blocks; 16. a first defect; 17. a second defect; 18. the pipe being inspected.
Detailed Description
The following detailed description of the invention, in conjunction with the examples, is intended to be merely exemplary and explanatory and should not be construed as limiting the scope of the invention in any way, as described in detail below, in order to provide a better understanding of the invention as embodied in the present invention.
As shown in fig. 1-2, the specific scheme of this embodiment is as follows: the utility model provides a key area gas pipeline on-line monitoring device, including arranging a plurality of phased array probes 10 that are used for scanning pipeline defect on the gas pipeline lateral wall, phased array probe 10 is the ultrasonic phased array probe specifically, phased array probe 10 is fixed on the outer wall of gas pipeline, because gas pipeline can scribble the anticorrosive coating on the pipeline outer wall in the work progress, the existence of anticorrosive coating can make the detectability of phased array probe 10 weaken, so when arranging the phased array probe, the regional general anticorrosive coating that can not be coated of arranging, but adopt the anticorrosive cover to wrap up the probe together inside, or adopt the mode construction of anticorrosive bag in key area, phased array probe 10 is directly arranged in the anticorrosive bag, both satisfy the anticorrosive requirement, also adapt to the requirement that the probe was arranged;
The phased array probes 10 are simultaneously and communicatively connected to the data converter 14, the data converter 14 is located on the control host 11 and is in data communication with each other, the data converter 14 is provided with a plurality of data interfaces, the data converter 14 can be simultaneously connected with the phased array probes 10, and the phased array probes 10 and the data converter 14 are communicated by adopting a data cable with interference resistance; the control host 11 is in communication connection with the monitoring management platform 12, the monitoring management platform 12 is in communication connection with the user terminal 13, and 5G communication is adopted between the user terminal 13 and the monitoring management platform 12, so that a user can conveniently check at any time;
The control host 11 includes a control module, which is used for controlling the operation of the phased array probe 10, and the control module is mainly used for controlling the opening and stopping and scanning angles of the phased array probe 10, such as: creating a focusing rule to control the time of sending and receiving ultrasonic beams by each probe array unit, controlling the beam angle, the focusing depth, the focusing size and the like, completing quick scanning, and obtaining echo signals containing defect information, visualized A-scanning, S-scanning, C-scanning, D-scanning and the like; therefore, according to the detection result, quantitative, qualitative and positioning analysis can be carried out on the defects, including the size and the size of the defects, the types of the defects, the positions of the spatial structures and the like;
A storage module for storing various data related to the phased array probe 10, such as: scanning result data, control data, information data and the like, wherein the scanning result data comprises scanning images, echo information, result analysis data and the like, the control data mainly comprises control interval time information for starting up the phased array probe 10, control data for increasing the frequency of the phased array probe 10 for preventing equipment errors, priority control data before and after the operation of different phased array probes 10 and the like, and the information data comprises information data, address information and the like of the probes;
a network module for communicating with the monitoring management platform 12.
As a preferred mode of the above embodiment, the monitoring and management platform 12 includes a data analysis module for classifying the defects scanned by the phased array probe 10, wherein the defect classification is performed according to the hazard level of the defects, and according to different classified defects, sending out early warning information, and establishing defect files of the phased array probe 10 at different positions, wherein the defect files include all data information related to the phased array probe 10 stored in the memory module of the control host 11;
The early warning module is used for receiving the early warning information and sending out early warning;
and the display module is used for displaying the defect file information and facilitating data calling and display.
A method for monitoring a gas pipeline by a gas pipeline on-line monitoring device in a key area comprises the following steps:
Step 1: the method comprises the steps of hardware arrangement, platform construction and basic defect detection, wherein a phased array probe 10 is connected when a gas pipeline is installed, a control host 11 is connected, after each function test of a system is completed, the phased array probe 10 carries out all-round detection for the first time, judges and evaluates the defects which are allowed to exist in a standard range and have dangerous hidden danger and the positions of the defects, and takes the defects as basic defect data, wherein the basic defects mainly comprise original defects, welding defects or other defects possibly existing such as repaired defects of the pipeline during processing and forming, and the phased array probe 10 is installed at the positions of the basic defects so as to monitor the defects;
Step 2: presetting defect grading grades in the monitoring management platform 12, presetting corresponding alarm information of different grades, presetting interval detection time, wherein the preset defect grades can be modified according to actual selection, default grading and default alarm information are generally adopted, the preset detection interval time is generally 10-12 months in the first detection time, the first detection is the first start detection after basic defects are detected, namely, the interval time is 10-12 months, and the second detection interval time are adjusted according to the defect conditions;
Step 3: after reaching the preset detection time, the control host 11 controls the phased array probe 10 to perform defect scanning, detects whether the defects are enlarged, changes the scanning angle and the scanning range of the phased array probe 10, detects whether derivative defects exist around, stores data of defect scanning, and sends the data to the monitoring management platform 12 for analysis, wherein a display module of the monitoring management platform 12 can directly display original data of the defects, and can be shown in fig. 3 (a) and fig. 4 (b);
Step 4: after receiving the data sent by the control host 11, the monitoring management platform 12 compares the detected data with basic defect data, classifies the received data according to the compared situation, and establishes a defect file of the position, wherein the specific defect file is established by an analysis module of the monitoring management platform 12 and is stored in the host control host 11, and the monitoring management platform 12 can be used for calling and reading; and then, according to the grading result, early warning information is sent, and the early warning information can be directly displayed on the monitoring management platform 12 or transmitted to the user terminal 13 so as to remind a worker to overhaul and correspondingly treat the pipeline.
As shown in fig. 1, in step 4, the monitoring management platform 12 performs data comparison, mainly to compare echo amplitudes of image data;
and classifying and transmitting the early warning information according to the following conditions:
when the received echo amplitude is 0% -40%, judging the grade as an acceptable defect, and setting an early warning mode as no early warning;
when the received echo amplitude is 40% -80%, judging the grade as a focus defect, setting an early warning mode as an early warning prompt, and setting the detection time of a secondary detection interval;
when the received echo amplitude is 80% or more, judging the grade as defect to be processed, and setting an early warning mode as continuous warning until the defect is solved;
When the defect needing to be processed occurs, the alarm is continuously carried out, the alarm information is sent out by an early warning module of the monitoring management platform 12, and the relevant alarm can be received on the user terminal 13 so as to realize remote reminding, thereby being convenient for arranging staff to overhaul.
As a preferable mode of the above embodiment, when the difference between the echo amplitude of the scanned defect and the echo amplitude of the last scanned defect is greater than 6dB, the phased array probe 10 indicates that the defect is enlarged, so the focusing rule of the phased array probe 10 needs to be changed to change the scanning angle and the scanning range of the phased array probe 10, and the derivative defect is detected;
Specifically, the phased array detection technology sends out ultrasonic beams through the probe array, creates a focusing rule to control the time of sending out and receiving the ultrasonic beams by each probe array unit, controls the beam angle, the focusing depth, the focusing size and the like, completes quick scanning, and can obtain echo signals containing defect information, visual A scanning, S scanning, C scanning, D scanning and the like.
As shown in fig. 1, as a preferred mode of the above embodiment, the secondary detection interval time set in the early warning mode after the step 4 is classified is T, and the calculation mode is as follows: (1) Wherein: For the last time of the interval detection, In order for the attenuation coefficient to be a factor,Is the defect echo amplitude; the formula shows that the interval time of the second detection is related to the amplitude and the attenuation coefficient of the defect echo, so that the detection time needs to be shortened as the amplitude of the defect echo increases on the basis of the last detection time, namely, the interval time is reduced, and the problem that accidents occur because the interval time is too long after the defect is enlarged is avoided.
The specific calculation mode is as follows;
In this embodiment, according to the environment of the present application and the material of the gas pipeline, The value of the water-based paint is 1,The value is 12 months according to month calculation, namely 1 year;
Detecting 20% of echo amplitude of basic defects, selecting 12 months in the first detection interval, and when 60% of echo amplitude of the defects are detected after the first detection, taking data into the formula, namely: The interval time is shortened by half during the second detection of the defect, so that the defect is prevented from being enlarged, and the detection interval time is shortened as the echo amplitude of the defect is larger, so that the detection interval time is required to be reduced gradually, and the detection interval time is required to be reduced gradually when the classification of the defect to be processed is not achieved, so that the safety is ensured.
As a preferred way of the above embodiment, it is also necessary to calculate and compare in step 4 the expansion rate (V) of the defect:
The calculation method is as follows:
V=（A2-A1）/T0 （2）
Wherein A2 is the detected amplified defect echo amplitude, A1 is the defect echo amplitude before detection, wherein A1 is the defect echo amplitude before an interval detection time, namely the defect echo amplitude detected last time in the interval time, including the echo amplitude of the basic defect;
The calculated expansion rate is then used to calculate the time (T1) required for the defect echo amplitude to reach 80%, namely:
T1=（80%-A2）/V； （3）
And comparing T1 with T, and selecting the minimum time value as the detection interval time.
For example, the two time calculation methods are adopted for comparison:
the specific situation is as follows: 1. for the same defect, the detected basic defect echo amplitude is 20%, and the echo amplitude of the defect after the first detection is 60%;
the time calculated by the formula (1) is 6.5 months;
Calculation using formula (2) yields v= (60% -20%)/12=0.0333;
calculated using equation (3) to obtain t1= (80% -60%)/0.3333=6 months.
2. For the same defect, detecting that the echo amplitude of the basic defect is 20%, and the echo amplitude of the defect after the first detection is 50%;
The time calculated by the formula (1) is 7.2 months;
Calculation using equation (2) yields v= (50% -20%)/12=0.025;
Calculated using equation (3) t1= (80% -50%)/0.025=12 months.
Therefore, according to the two cases, when the 1 st situation occurs, it is obvious that the time calculated by the formulas (2) and (3) is shorter, so that the second detection interval time is determined to be 6 months; in case of the 2 nd situation, it is obvious that the time calculated by the formula (1) is shorter, so that the second detection interval is determined to be 7.2 months.
In step 3, the data converter 14 has a plurality of signal interfaces for communicating with the phased array probe 10;
The control host 11 automatically detects a signal interface connected with the phased array probe 10, and assigns an address label to the accessed signal interface, where the address label is only used to indicate the label of the accessed phased array probe 10, and only used as distinguishing information, and transmits the address label to the monitoring management platform 12, where the monitoring management platform 12 pops up the position coordinate of the corresponding phased array probe 10 to which the address label needs to be input, where the coordinate system of the position coordinate is a one-dimensional linear coordinate, and the coordinate of the first input phased array probe 10 is the origin by default, as shown in fig. 2, specifically, when the coordinate system is established, a length range of 800-1000m of a gas pipeline is generally selected, as a coordinate system range of the phased array probe 10 connected with one data converter 14, for example, in fig. 2, four defect positions of o, x1, x2 and x3 are detected in the range of 1000m, then the o-point is used as the origin of the coordinate system, the coordinate system is established in the range of 1000m, so as to confirm the coordinate positions of four defects, and the defect outside the range of 1000m is detected by the other control host or the phased array probe 10 connected with the data converter 14.
When the control host 11 controls the phased array probe 10 to start detection, the mode is mixed detection, specifically, when the mixed detection mode is used, the method is adopted only when the basic defect scanning is completed for 12 months and then the first defect detection scanning is performed, or when the phased array probe 10 for detection is simultaneously started to more than 3 defects in the second and later defect scanning processes;
Hybrid inspection is a simultaneous inspection of multiple phased array probes 10, with a stepwise inspection of the individual phased array probes 10.
The specific method for the mixed detection comprises the following steps: the monitoring and management platform 12 calculates the distance between two adjacent phased array probes 10 according to the established coordinate system, counts the number of the two adjacent phased array probes 10 exceeding 100mm and corresponding address labels, divides the two phased array probes into simultaneous detection types, and enjoys the highest priority of the priority of starting detection in the detection process; the rest adjacent phased array probes 10 which are not more than 100mm sequentially enjoy the detection priority from small to large according to the coordinate distance and start detection step by step according to the coordinate direction;
Reference is made to fig. 2, in which the distance between ox1 > 100mm, the distance between x1x2 is less than 100mm, and the distance between x2x3 is greater than 100mm, then the defects at o, x3 are first classified into one type, with highest priority, or one of x2 or x3 is classified into one type with highest priority, but the situation that the distance between two phased array probes 10 is < 100mm is avoided; during scanning, the phased array probe 10 of the most preferred stage is synchronously started to scan first, and after the scanning is finished, single scanning is sequentially performed in the sequence of x2 or x3 (namely, the sequence of the directions of the coordinate system) until the defect scanning in the whole coordinate system is finished.
In this embodiment, the reason that the adjacent phased array probes 10 are differentiated from each other by more than 100mm and not more than 100mm is mainly to avoid two similar defects, and interference occurs when the phased array probes 10 start scanning simultaneously, so that the detection efficiency can be effectively improved by matching with a synchronous scanning and step-by-step scanning mode;
In addition, when inputting the coordinate position of the phased array probe 10, in order to accelerate the efficiency, a relatively rough distance between two adjacent phased array probes 10 is generally selected, for example, in fig. 2, the distance between ox1 is greater than 100mm, when inputting the coordinate of x1, the distance between x1x2 is smaller than 100mm, when inputting the coordinate of x2, the relatively rough distance between the coordinate of the next phased array probe 10 is smaller than 100mm, and the relative rough distance between the coordinate of the next phased array probe 10 is described according to the direction of the coordinate system relative to the coordinate of the previous phased array probe 10, so that only the relatively rough distance between the two coordinates needs to be input, and the distance between the two coordinates does not need to be measured, thereby significantly improving the coordinate input efficiency.
It should be noted that, in this document, the terms include, comprise, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The principles and embodiments of the present invention are described herein by applying specific examples, and the above examples are only used to help understand the method and core idea of the present invention. The foregoing is merely a preferred embodiment of the invention, and it should be noted that, due to the limited text expressions, there is objectively no limit to the specific structure, and that, for a person skilled in the art, modifications, adaptations or variations may be made without departing from the principles of the present invention, and the above technical features may be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present invention.
Claims (6)
1. The method is characterized in that a monitoring device adopted by the method comprises a plurality of phased array probes (10) which are arranged on the outer side wall of the gas pipeline and used for scanning pipeline defects, the phased array probes (10) are simultaneously connected with a data converter (14) in a communication mode, the data converter (14) is positioned on a control host (11) and in data communication with each other, the control host (11) is connected with a monitoring management platform (12) in a communication mode, and the monitoring management platform (12) is connected with a user terminal (13) in a communication mode;
The control host (11) comprises a control module for controlling the phased array probe (10) when scanning for defects;
A memory module for storing various data related to the phased array probe (10);
A network module for communicating with the monitoring management platform (12);
The method for on-line monitoring the gas pipeline by the device comprises the following steps:
Step 1: the method comprises the steps of hardware arrangement, platform construction and basic defect detection, wherein a phased array probe (10) is connected when a gas pipeline is installed, a control host (11) is connected, after each function test of a system is completed, the phased array probe (10) carries out omnibearing detection on the gas pipeline for the first time, judges and evaluates the defects which are allowed to exist in a standard range and have dangerous hidden danger and the positions of the defects, and takes the defects as basic defect data, wherein the basic defects mainly comprise original defects, welding defects or repaired defects of the pipeline during processing and forming, and the phased array probe (10) is installed at the positions of the basic defects so as to monitor the defects;
Step 2: presetting defect grading grades in a monitoring management platform (12), presetting corresponding alarm information of different grades, and presetting interval detection time;
step 3: after reaching the preset detection time, the control host (11) controls the phased array probe (10) to scan the defects, detects whether the defects are enlarged, changes the scanning angle and the scanning range of the phased array probe (10), detects whether derivative defects exist around the phased array probe, stores data scanned by the defects, and sends the data to the monitoring management platform (12) for analysis;
Step 4: after receiving the data sent by the control host (11), the monitoring management platform (12) compares the detected data with basic defect data, classifies the received data according to the compared condition, and establishes a defect file of the position; according to the grading result, early warning information is sent, and the early warning information can be directly displayed on a monitoring management platform (12) or transmitted to a user terminal (13) so as to remind a worker to overhaul and correspondingly treat the pipeline;
In the step 4, when the monitoring management platform (12) performs data comparison, echo amplitude of the image data is mainly compared;
and classifying and transmitting the early warning information according to the following conditions:
when the received echo amplitude is 0% -40%, judging the grade as an acceptable defect, and setting an early warning mode as no early warning;
when the received echo amplitude is 40% -80%, judging the grade as a focus defect, setting an early warning mode as an early warning prompt, and setting the detection time of a secondary detection interval;
when the received echo amplitude is 80% or more, judging the grade as defect to be processed, and setting an early warning mode as continuous warning until the defect is solved;
The secondary detection interval time set in the early warning mode after the defect echo amplitude classification is T, and the calculation mode is as follows:
，
In the formula: For the last time of the interval detection, In order for the attenuation coefficient to be a factor,Is the defect echo amplitude;
in step 4, calculation and comparison are also required according to the defect expansion rate V:
The calculation method is as follows: v= (A2-A1)/T 0
Wherein A2 is the detected amplified defect echo amplitude, and A1 is the defect echo amplitude before detection;
then, the time T1 required for the defect echo amplitude to reach 80% is calculated by using the calculated expansion rate, namely:
T1=（80%-A2）/V；
And comparing T 1 with T, and selecting the minimum time value as the detection interval time.
2. The method for on-line monitoring of a fuel gas pipeline in a key area according to claim 1, wherein the monitoring management platform (12) comprises a data analysis module for classifying defects scanned by the phased array probe (10), establishing defect files of the phased array probe (10) in different positions, and sending out early warning information;
the early warning module is used for receiving the early warning information and sending out early warning;
and the display module is used for displaying the defect file information and facilitating data calling and display.
3. The method for on-line monitoring of a gas pipeline in a key area according to claim 1, wherein when the difference between the echo amplitude of a scanned defect and the echo amplitude of the last scanned defect is greater than 6dB, the phased array probe (10) changes the focusing rule of the phased array probe (10) so as to change the scanning angle and the scanning range of the phased array probe (10) and detect the derivative defect.
4. The on-line monitoring method for gas pipelines in key areas according to claim 1, wherein in step 3, the data converter (14) is provided with a plurality of signal interfaces which are communicated with the phased array probe (10);
The control host (11) automatically detects a signal interface connected with the phased array probe (10), gives an address label to the accessed signal interface, transmits the address label to the monitoring management platform (12), pops up the position coordinate of the corresponding phased array probe (10) which needs to be input by the address label on the monitoring management platform (12), the coordinate system is one-dimensional linear coordinate, and the coordinate of the first input phased array probe (10) is defaulted to be the origin.
5. The on-line monitoring method for gas pipelines in key areas according to claim 4, wherein the control host (11) controls the mode of opening detection of the phased array probe (10) to be mixed detection;
The hybrid detection is that a plurality of phased array probes (10) are detected simultaneously and are matched with single phased array probes (10) to detect gradually.
6. The method for on-line monitoring of a fuel gas pipeline in a key area according to claim 5, wherein the specific method for mixed detection is as follows: the monitoring management platform (12) calculates the distance between two adjacent phased array probes (10) according to the established coordinate system, counts the number of the two adjacent phased array probes (10) which exceed 100mm and the corresponding address labels, divides the two phased array probes into simultaneous detection types, and enjoys the highest priority of the priority starting detection in the detection process; the remaining phased array probes (10) which are adjacent to each other and not more than 100mm are sequentially provided with detection priority from small to large according to the coordinate distance and are started and detected step by step.
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