CN111765390A - Pipeline leakage point positioning method and system based on acoustic emission response - Google Patents
Pipeline leakage point positioning method and system based on acoustic emission response Download PDFInfo
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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Abstract
The embodiment of the application provides a pipeline leakage point positioning method and device based on acoustic emission response, wherein the positioning device comprises: the pipeline control valve is used for closing or reducing a downstream port of the pipeline to be tested so as to generate stress waves from the downstream port to an upstream port in the pipeline to be tested; the first acoustic emission sensor is used for receiving stress waves near a downstream port of the pipeline to be detected and reverse stress waves generated by a pipeline leakage point; the second acoustic emission sensor is used for receiving stress waves near an upstream port of the pipeline to be tested; and the data processing unit is used for calculating to obtain the position of the pipeline leakage point according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the pipeline leakage point and the stress wave near the upstream port of the pipeline to be tested. The method and the device for positioning the pipeline leakage point based on the acoustic emission response are simple to operate, high in efficiency and high in positioning accuracy, and labor intensity of manual line troubleshooting is greatly reduced.
Description
Technical Field
The application belongs to the technical field of pipeline detection, and particularly relates to a pipeline leakage point positioning method and system based on acoustic emission response.
Background
At present, oil, water and pipelines in China cover backbone networks of natural gas, crude oil and finished oil and urban heat supply and water supply networks in most regions of China. And pipeline leakage accident takes place occasionally in recent years, not only influence normal production, still can cause environmental pollution and wasting of resources, there are more pipeline leakage on-line monitoring system in the existing market, but these systems mostly can not leak judgement and location to corrosion development type leakage, especially bury the ground pipeline, even can judge its leakage through the pressure of pressure-bearing pipeline, operating parameter such as flow, nevertheless hardly fix a position the leakage point, consequently, can be quick after the pipeline takes place to leak and fix a position the judgement to the leakage position is a problem that awaits the solution urgently.
The existing methods for positioning the leakage point of the pipeline comprise a correlator detection method, an infrared detection method, a manual detection method and the like. The principle of using the most correlators to detect the leakage points is that audio receivers are arranged at two ends of a pipe section to be detected, leakage sound generated by friction between a leakage medium and the wall of the pipe is spread to the two ends along the pipe to be positioned, and a time difference is determined by a delay value of an extreme point of a cross-correlation function, so that the positioning is carried out.
The existing method for positioning the leakage point of the pipeline generally has the problems of low working efficiency, easy environmental influence, poor positioning precision and the like. Meanwhile, some long-distance pipelines with the length of more than ten kilometers or even dozens of kilometers, pipelines with the buried depth of several meters and pipelines crossing rivers are difficult to adopt the method for positioning the leakage points to carry out leakage point positioning detection.
Acoustic Emission is a common physical phenomenon, and the phenomenon that a local source in a material releases energy quickly to generate transient elastic waves is called Acoustic Emission (AE), and is sometimes called stress wave Emission. The internal stress of the material is suddenly redistributed due to the change of the internal structure of the material; converting the mechanical energy into acoustic energy; elastic waves are generated, the frequency of the stress waves generally being between 1KHz and 1 MHz.
Disclosure of Invention
The invention provides a method and a system for positioning a pipeline leakage point based on acoustic emission response, and aims to solve the problems of low working efficiency, easy environmental influence, poor positioning accuracy and the like of the conventional method for positioning the pipeline leakage point.
According to a first aspect of the embodiments of the present application, there is provided a pipe leak location device based on acoustic emission response, specifically including:
the pipeline control valve is used for closing or reducing a downstream port of the pipeline to be tested so as to generate stress waves from the downstream port to an upstream port in the pipeline to be tested; the stress wave is generated by fluid in the pipeline after the fluid in the pipeline is blocked by the valve;
the first acoustic emission sensor is used for receiving stress waves near a downstream port of the pipeline to be detected and reverse stress waves generated by a pipeline leakage point;
the second acoustic emission sensor is used for receiving stress waves near an upstream port of the pipeline to be tested;
and the data processing unit is used for calculating to obtain the position of the pipeline leakage point according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the pipeline leakage point and the stress wave near the upstream port of the pipeline to be tested.
Optionally, the data processing unit obtains the position of the pipeline leakage point according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the pipeline leakage point, and the stress wave near the upstream port of the pipeline to be tested, and the method specifically includes:
identifying initial sound wave characteristics according to the stress wave near the downstream port of the pipeline to be tested and recording the initial time of the stress wave; identifying the sound wave reaching characteristics according to the stress wave near the upstream port of the pipeline to be tested and recording the stress wave receiving time; according to the reverse stress wave generated by the pipeline leakage point near the downstream port of the pipeline to be tested, identifying the acoustic wave characteristic excited by the leakage point and recording the receiving time of the reverse stress wave;
calculating the sound velocity of the stress wave propagating in the pipeline according to the lengths of the head end and the tail end of the pipeline, the stress wave starting time and the stress wave receiving time;
calculating the time length of the stress wave from the downstream port to the pipeline leakage point according to the stress wave starting time and the opposite direction stress wave receiving time generated by the pipeline leakage point;
and calculating the distance between the pipeline leakage point and the downstream port according to the sound velocity of the stress wave propagating in the pipeline and the time length of the stress wave from the downstream port to the pipeline leakage point.
Optionally, the first acoustic emission sensor and the second acoustic emission sensor are respectively installed at an upstream port and a downstream port of the pipe to be measured, and a distance between the two acoustic emission sensors is a length of the pipe to be measured.
Optionally, the acoustic emission sensor is vertically mounted on the outer side wall of the pipe to be measured through a G1/2 interface ball valve.
Optionally, the pipeline leakage point positioning device further comprises an acquisition controller, and the acquisition controller is used for receiving the acoustic emission sensor signal and remotely transmitting the acoustic emission sensor signal to the data processing unit.
Optionally, the acquisition controller includes a GPS time service module, and the GPS time service module is used to ensure the synchronization precision of the acquisition at both ends of the pipeline to be measured.
Optionally, the acquisition controller includes a 4G wireless module, and the 4G wireless module is configured to transmit the stress wave data to the data processing unit.
Optionally, the acoustic emission sensor and the acquisition controller communicate using a CAN bus protocol.
According to a second aspect of the embodiments of the present application, there is provided a method for locating a pipe leak point based on an acoustic emission response, specifically including the following steps:
closing or reducing a downstream port pipeline control valve of a downstream port of the pipeline to be tested, and generating stress waves from the downstream port to an upstream port in the pipeline to be tested; the stress wave is generated by fluid in the pipeline after the fluid in the pipeline is blocked by the valve;
receiving stress waves near a downstream port of a pipeline to be tested and reverse stress waves generated by a pipeline leakage point; receiving stress waves near an upstream port of a pipeline to be tested;
and calculating to obtain the position of the leakage point of the pipeline according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the leakage point of the pipeline and the stress wave near the upstream port of the pipeline to be tested.
Optionally, an upstream port control valve is arranged at an upstream port of the pipeline to be tested; and controlling the fluid pressure and the fluid flow in the pipeline to be tested through the downstream port valve and the upstream port valve.
Optionally, the position of the pipeline leakage point is calculated according to the stress wave near the downstream port of the pipeline to be tested, the reverse direction stress wave generated by the pipeline leakage point, and the stress wave near the upstream port of the pipeline to be tested, and the method specifically includes:
identifying initial sound wave characteristics according to the stress wave near the downstream port of the pipeline to be tested and recording the initial moment of the stress wave; identifying the arriving sound wave characteristics according to the stress wave near the upstream port of the pipeline to be tested and recording the stress wave receiving time; according to the reverse stress wave generated by the pipeline leakage point near the downstream port of the pipeline to be tested, identifying the acoustic wave characteristic excited by the leakage point and recording the receiving time of the reverse stress wave;
calculating the sound velocity of the stress wave propagating in the pipeline according to the lengths of the head end and the tail end of the pipeline, the stress wave starting time and the stress wave receiving time;
calculating the time length of the stress wave from the downstream port to the pipeline leakage point according to the stress wave starting time and the opposite direction stress wave receiving time generated by the pipeline leakage point;
and calculating the distance from the pipeline leakage point to the downstream port according to the sound velocity of the stress wave propagating in the pipeline and the time length of the stress wave from the downstream port to the pipeline leakage point.
By adopting the method and the device for positioning the leakage point of the pipeline based on the acoustic emission response in the embodiment of the application, firstly, the downstream port of the pipeline to be tested is closed or reduced, and stress waves generated from the downstream port to the upstream port in the pipeline to be tested are generated; secondly, receiving stress waves near a downstream port of the pipeline to be tested and reverse stress waves generated by a pipeline leakage point; receiving stress waves near an upstream port of a pipeline to be tested; and then, obtaining the position of the pipeline leakage point according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the pipeline leakage point and the stress wave near the upstream port of the pipeline to be tested. The method and the device for positioning the leakage point of the pipeline based on the acoustic emission response are simple to operate, high in efficiency and high in positioning accuracy, labor intensity of manual line troubleshooting is greatly reduced, economic loss and environmental pollution caused by production halt due to leakage are reduced, and the problems that an existing method for positioning the leakage point of the pipeline is low in working efficiency, easy to be influenced by the environment, poor in positioning accuracy and the like are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 4 is a schematic structural diagram of a pipe leak location device based on acoustic emission response according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a pipe leak location apparatus based on acoustic emission response according to another embodiment of the present application;
FIG. 3 is a schematic time chart showing records of each receiving moment of acoustic emission in the pipeline leakage point positioning method according to the embodiment of the application;
FIG. 1 is a schematic diagram illustrating steps of a method for locating a pipe leak based on acoustic emission response according to an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating steps of data processing performed by a data processing unit according to an embodiment of the present application;
the system comprises an acquisition controller 1, a remote central server 2, a pipeline to be detected 3, a pipeline leakage point 4, a first acoustic emission sensor 5, a second acoustic emission sensor 51, a downstream port control valve 6, an upstream port control valve 7, a power supply 101, a GPS time service module 102 and a wireless module 103-4G.
Detailed Description
In the process of realizing the method, the inventor finds that the method for positioning the leakage point of the pipeline generally has the problems of low working efficiency, easy environmental influence, poor positioning precision and the like. The implementation of leak-checking for long pipelines up to tens of kilometers or even tens of kilometers is more difficult. The common operating parameters such as pressure and flow through the pressure-bearing pipeline judge that its leakage point can not satisfy the demand of high efficiency and high accuracy more and more.
The inventors have also found that when the circulating pipe is closed or partially closed rapidly downstream, the material inside the pipe generates stress wave emissions, i.e. acoustic emissions, which can be received by acoustic emission sensors. Meanwhile, when the pipeline transmits the stress wave through the pipeline leakage point, the pipeline leakage point is excited to generate the stress wave in the opposite direction, so that the inventor of the application invents the pipeline leakage point positioning method and system based on the acoustic emission response based on the discovery.
Firstly, closing or reducing a downstream port of a pipeline to be tested, and generating stress waves from the downstream port to an upstream port in the pipeline to be tested; secondly, receiving stress waves near a downstream port of the pipeline to be tested and reverse stress waves generated by a pipeline leakage point; receiving stress waves near an upstream port of a pipeline to be tested; and then, obtaining the position of the pipeline leakage point according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the pipeline leakage point and the stress wave near the upstream port of the pipeline to be tested.
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example 1
For details which are not disclosed in the pipe leak positioning device based on acoustic emission response of the present embodiment, please refer to the pipe leak positioning method based on acoustic emission response in other embodiments.
A schematic structural diagram of a pipeline leak point locating device based on acoustic emission response according to an embodiment of the present application is shown in FIG. 1.
As shown in fig. 1, the pipeline leak source positioning device based on acoustic emission response specifically includes a pipeline control valve 6, a first acoustic emission sensor 5, a second acoustic emission sensor 51 and a data processing unit 2, specifically:
and the pipeline control valve 6 is used for closing or reducing the downstream port of the pipeline 3 to be tested, and stress waves generated from the downstream port to the upstream port in the pipeline to be tested.
The device comprises a first acoustic emission sensor 5, a second acoustic emission sensor 51 and a plurality of acoustic emission sensors 5, wherein the number of the acoustic emission sensors is two, and the first acoustic emission sensor 5 and the second acoustic emission sensor 51 are respectively arranged at an upstream port and a downstream port of the pipeline to be tested and are used for receiving stress waves near the downstream port of the pipeline to be tested and opposite stress waves generated by a pipeline leakage point; and receiving the stress wave near the upstream port of the pipeline to be tested.
And the data processing unit 2 is used for obtaining the position of the pipeline leakage point according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the pipeline leakage point and the stress wave near the upstream port of the pipeline to be tested.
As shown in fig. 1, the number of the acoustic emission sensors is two, and the acoustic emission sensors are respectively installed at an upstream port and a downstream port of the pipe to be measured, and a distance between the two acoustic emission sensors, that is, a distance between the first acoustic emission sensor 5 and the second acoustic emission sensor 51, is a length L of the pipe to be measured.
The first acoustic emission sensor 5 and the second acoustic emission sensor 51 are vertically installed on the outer side wall of the pipeline to be measured through a G1/2 interface ball valve. The field pipeline detection, disassembly and assembly are simpler and more time-saving, and the working efficiency is improved.
As shown in fig. 1, the pipeline leakage point device of the present application further includes an acquisition controller 1, the number of the acquisition controller 1 is two, the acquisition controller 1 respectively receives stress wave signals of the first acoustic emission sensor 5 and the second acoustic emission sensor 51, and the stress wave signals are remotely transmitted to the data processing unit 2, and the data processing unit 2 is disposed in a remote service center. The remote service center can process the stress wave data in real time, identify signal modes and accurately position and calculate the electric leakage of the pipeline.
A schematic structural diagram of a pipe leak location device based on acoustic emission response according to another embodiment of the present application is shown in FIG. 2.
As shown in fig. 2, the upstream port of the pipe leak-point positioning device is provided with an upstream port control valve 7, and the pressure and flow rate of the fluid in the pipe to be measured can be controlled by the downstream port valve 6 and/or the upstream port valve 7.
As shown in fig. 2, the acquisition controller 1 includes a GPS time service module 102, and the GPS time service module 102 is used to ensure the synchronization precision of the acquisition controllers at two ends of the pipeline to be measured.
The acquisition controller further comprises a power supply 101 and a 4G wireless module 103, wherein the 4G wireless module 103 is used for transmitting the stress wave data to the data processing unit. That is, the acquisition controller transmits the stress wave data to the remote central server in the 4G wireless mode 103 without complex work such as cable laying in the past.
Optionally, the acoustic emission sensor and the acquisition controller communicate by using a CAN bus protocol, so as to improve the accuracy of data transmission.
The pipeline leak source positioning device based on acoustic emission response of the embodiment of the application adopts the acquisition controller 1 to receive acoustic emission sensor signals, and remotely transmits the signals to the data processing unit 2, and the data processing unit 2 can be arranged in a remote service center. The remote service center can process the stress wave data in real time, identify signal modes and accurately position and calculate the electric leakage of the pipeline.
Fig. 5 is a schematic diagram illustrating steps of data processing performed by the data processing unit according to the embodiment of the present application.
The data processing unit 2 performs stress wave data processing to realize pipeline leak point positioning, specifically, as shown in fig. 5, the method includes the following steps:
fig. 4 is a schematic time chart illustrating recording of each receiving time of a stress wave in the pipeline leak point positioning method according to the embodiment of the application.
Step S31: as shown in fig. 3(a), it is a waveform diagram of the stress wave received by the downstream port of the pipeline to be tested. Identifying initial sound wave characteristics according to the stress wave near the downstream port of the pipeline to be tested and recording the stress wave initial time T0; according to the reverse stress wave generated by the pipeline leakage point near the downstream port of the pipeline to be tested, the acoustic wave characteristic excited by the leakage point is identified, and the receiving time T1 of the reverse stress wave is recorded.
As shown in fig. 3(b), it is a waveform diagram of the stress wave received by the upstream port of the pipe to be tested. Identifying the arrival sound wave characteristics according to the stress wave near the upstream port of the pipeline to be tested and recording the stress wave receiving time T2;
step S32: firstly, calculating the sound velocity V of stress waves propagating in the pipeline according to the length L of the head end and the tail end of the pipeline, the stress wave starting time T0 and the stress wave receiving time T2, wherein the sound velocity V is calculated by the following formula (1):
step S33: then, the time length T of the stress wave from the downstream port to the pipeline leakage point is calculated according to the stress wave starting time T0 and the reverse stress wave receiving time T1 generated by the pipeline leakage point, and the time length T is calculated by the following formula (2):
step S34: and finally, calculating the distance X between the pipeline leakage point and the downstream port according to the sound velocity V of the stress wave propagating in the pipeline and the time T for the stress wave to reach the pipeline leakage point from the downstream port, wherein the distance X is calculated according to the following formula (3):
x is V T formula (3)
When the pipeline leakage point positioning method based on acoustic emission response is implemented, when stress waves are generated by excitation, only the downstream port control valve needs to be closed quickly or the control valve needs to be adjusted to be small quickly, the operation is simple, and numerous and complicated other operations are avoided.
By adopting the pipeline leakage point positioning device based on acoustic emission response in the embodiment of the application, firstly, the downstream port of the pipeline to be tested is closed or reduced through the pipeline control valve 6, and stress waves from the downstream port to the upstream port are generated in the pipeline to be tested; secondly, receiving stress waves near a downstream port of the pipeline to be detected and reverse stress waves generated by a pipeline leakage point through an acoustic emission sensor 5; receiving stress waves near an upstream port of a pipeline to be tested; and then, obtaining the position of the pipeline leakage point by the data processing unit 2 according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the pipeline leakage point and the stress wave near the upstream port of the pipeline to be tested. The method and the device for positioning the leakage point of the pipeline based on the acoustic emission response are simple to operate, high in efficiency and high in positioning accuracy, labor intensity of manual line troubleshooting is greatly reduced, economic loss and environmental pollution caused by production halt due to leakage are reduced, and the problems that an existing method for positioning the leakage point of the pipeline is low in working efficiency, easy to be influenced by the environment, poor in positioning accuracy and the like are solved.
In the implementation process, the pipeline leakage point positioning device based on acoustic emission response is easy to install on site. The whole system adopts a wireless transmission mode, and cables do not need to be laid on site; the positioning operation of the leakage point of the pipeline is simple, the on-off operation of some related valves is only needed on the site, other complex flow operations are not needed, and the labor force operation of personnel is greatly reduced.
The pipeline leakage point positioning device is high in applicability, and can be used for positioning leakage points of various pressure-bearing pipelines no matter buried pipelines or river-crossing pipeline replacement.
The utility model provides a pipeline that awaits measuring that pipeline leak source positioner is suitable for detects the distance long, and single-section pipeline detects length and reaches 60 Km. And the detection time is short. Only a few minutes are needed to complete the positioning of the leakage point after the field arrangement.
Example 2
A schematic step diagram of a method for locating a pipe leak based on acoustic emission response according to an embodiment of the present application is shown in fig. 4.
As shown in fig. 4, the method for positioning a pipe leak point based on acoustic emission response in the embodiment of the present application specifically includes the following steps:
s10: and closing or reducing a downstream port pipeline control valve of a downstream port of the pipeline to be tested, and generating stress waves from the downstream port to an upstream port in the pipeline to be tested. The stress wave is generated by the fluid in the pipeline after the fluid in the pipeline is blocked by the valve.
In the operation process, the downstream port of the pipeline is reduced by operating the downstream port control valve to quickly close or turning down the valve, and then stress waves can be generated in the pipeline to be tested and transmitted to the upstream end of the pipeline. The pipeline leakage point can be reached in the stress wave propagation process, different stress waves can be excited by the pipeline leakage point, and the stress waves are propagated to the two ends of the pipeline at the leakage point.
In the method for positioning the leakage point of the pipeline, a downstream port of the pipeline to be tested is provided with a downstream port control valve, or the downstream port and an upstream port of the pipeline to be tested are respectively provided with a downstream port control valve and an upstream port control valve; and controlling the fluid pressure and the fluid flow in the pipeline to be tested through the downstream port valve and/or the upstream port valve.
S20: receiving stress waves near a downstream port of a pipeline to be tested and reverse stress waves generated by a pipeline leakage point; and receiving the stress wave near the upstream port of the pipeline to be tested.
By closing or reducing the downstream port of the pipeline to be tested, stress waves generated from the downstream port to the upstream port are firstly received by an acoustic emission sensor near the downstream port of the pipeline to be tested; when the stress wave is transmitted to the leakage point of the pipeline, the stress wave in the opposite direction is transmitted to the downstream port and is also received by the acoustic emission sensor near the downstream port of the pipeline to be detected; and finally, when the stress wave is finally transmitted to the downstream port of the pipeline to be detected, the stress wave is received by the acoustic emission sensor near the upstream port of the pipeline to be detected.
S30: and obtaining the position of the leakage point of the pipeline according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the leakage point of the pipeline and the stress wave near the upstream port of the pipeline to be tested, which are received in the step S20.
Fig. 5 is a schematic diagram illustrating steps of data processing performed by the data processing unit according to the embodiment of the present application.
In step 20, the stress wave received by the acoustic emission sensor is sent to a data processing unit for data processing, and specifically, as shown in fig. 2, the method includes the following steps:
fig. 3 is a schematic time chart illustrating recording of each receiving time of a stress wave in the pipeline leak point positioning method according to the embodiment of the application. Wherein P is the wave pressure of the stress wave.
Step S31: as shown in fig. 3(a), it is a waveform diagram of the stress wave received by the downstream port of the pipeline to be tested. Identifying initial sound wave characteristics according to the stress wave near the downstream port of the pipeline to be tested and recording the stress wave initial time T0; according to the reverse stress wave generated by the pipeline leakage point near the downstream port of the pipeline to be tested, the acoustic wave characteristic excited by the leakage point is identified, and the receiving time T1 of the reverse stress wave is recorded.
As shown in fig. 3(b), it is a waveform diagram of the stress wave received by the upstream port of the pipe to be tested. Identifying the arrival sound wave characteristics according to the stress wave near the upstream port of the pipeline to be tested and recording the stress wave receiving time T2;
step S32: firstly, calculating the sound velocity V of stress waves propagating in the pipeline according to the length L of the head end and the tail end of the pipeline, the stress wave starting time T0 and the stress wave receiving time T2, wherein the sound velocity V is calculated by the following formula (1):
step S33: then, the time length T of the stress wave from the downstream port to the pipeline leakage point is calculated according to the stress wave starting time T0 and the reverse stress wave receiving time T1 generated by the pipeline leakage point, and the time length T is calculated by the following formula (2):
step S34: and finally, calculating the distance X between the pipeline leakage point and the downstream port according to the sound velocity V of the stress wave propagating in the pipeline and the time T for the stress wave to reach the pipeline leakage point from the downstream port, wherein the distance X is calculated according to the following formula (3):
x is V T formula (3)
When the pipeline leakage point positioning method based on acoustic emission response is implemented, when stress waves are generated by excitation, only the downstream port control valve needs to be closed quickly or the control valve needs to be adjusted to be small quickly, the operation is simple, and numerous and complicated other operations are avoided.
Meanwhile, the acoustic emission sensors for receiving the stress waves are respectively installed at the upstream port and the downstream port of the pipeline to be measured, and the distance between the two acoustic emission sensors is the length L of the pipeline to be measured.
The acoustic emission sensor can be vertically arranged on the outer side wall of the pipeline to be measured through a G1/2 interface ball valve. The field pipeline detection, disassembly and assembly are simpler and more time-saving, and the working efficiency is improved.
The pipeline leakage point method further comprises the step of receiving the acoustic emission sensor signal by adopting the acquisition controller, and remotely transmitting the acoustic emission sensor signal to the data processing unit, wherein the data processing unit is arranged in the remote service center. The remote service center can process the stress wave data in real time, identify signal modes and accurately position and calculate the electric leakage of the pipeline.
In another embodiment, the acquisition controller comprises a GPS time service module, and the GPS time service module is used to ensure the synchronization precision of the acquisition controller at the two ends of the pipeline to be measured.
The acquisition controller also comprises a 4G wireless module, and the 4G wireless module is used for transmitting the stress wave data to the data processing unit. Namely, the acquisition controller transmits the stress wave data to the remote central server in a 4G wireless mode without complex work such as cable laying in the prior art.
Optionally, the acoustic emission sensor and the acquisition controller communicate by using a CAN bus protocol, so as to improve the accuracy of data transmission.
By adopting the pipeline leakage point positioning method based on acoustic emission response in the embodiment of the application, firstly, the downstream port of the pipeline to be tested is closed or reduced, and stress waves generated from the downstream port to the upstream port in the pipeline to be tested are generated; secondly, receiving stress waves near a downstream port of the pipeline to be tested and reverse stress waves generated by a pipeline leakage point; receiving stress waves near an upstream port of a pipeline to be tested; and then, obtaining the position of the pipeline leakage point according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the pipeline leakage point and the stress wave near the upstream port of the pipeline to be tested. The method and the device for positioning the leakage point of the pipeline based on the acoustic emission response are simple to operate, high in efficiency and high in positioning accuracy, labor intensity of manual line troubleshooting is greatly reduced, economic loss and environmental pollution caused by production halt due to leakage are reduced, and the problems that an existing method for positioning the leakage point of the pipeline is low in working efficiency, easy to be influenced by the environment, poor in positioning accuracy and the like are solved.
In the implementation process, the device of the pipeline leakage point positioning method based on acoustic emission response is easy to install on site. The whole system adopts a wireless transmission mode, and cables do not need to be laid on site; the positioning operation of the leakage point of the pipeline is simple, the on-off operation of some related valves is only needed on the site, other complex flow operations are not needed, and the labor force operation of personnel is greatly reduced.
The pipeline leakage point positioning method is high in applicability, and can be used for positioning leakage points of various pressure-bearing pipelines, whether buried pipelines or river-crossing pipeline replacement pipelines.
The pipeline leakage point positioning method is suitable for long detection distance of the pipeline to be detected, and the detection length of the single-section pipeline reaches 60 Km. And the detection time is short. Only a few minutes are needed to complete the positioning of the leakage point after the field arrangement.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A pipeline leak source positioner based on acoustic emission response, its characterized in that specifically includes:
the pipeline control valve is used for closing or reducing a downstream port of the pipeline to be tested so as to generate stress waves from the downstream port to an upstream port in the pipeline to be tested; the stress wave is generated by fluid in the pipeline after the fluid in the pipeline is blocked by the valve;
the first acoustic emission sensor is used for receiving stress waves near a downstream port of the pipeline to be detected and opposite stress waves generated by a pipeline leakage point;
the second acoustic emission sensor is used for receiving stress waves near an upstream port of the pipeline to be tested;
and the data processing unit is used for calculating to obtain the position of the pipeline leakage point according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the pipeline leakage point and the stress wave near the upstream port of the pipeline to be tested.
2. The pipe leakage point positioning device according to claim 1, wherein the data processing unit calculates the position of the pipe leakage point according to the stress wave near the downstream port of the pipe to be measured, the reverse stress wave generated by the pipe leakage point, and the stress wave near the upstream port of the pipe to be measured, and specifically includes:
identifying initial sound wave characteristics according to the stress wave near the downstream port of the pipeline to be tested and recording the initial time of the stress wave; identifying the sound wave reaching characteristics according to the stress wave near the upstream port of the pipeline to be tested and recording the stress wave receiving time; according to the reverse stress wave generated by the pipeline leakage point near the downstream port of the pipeline to be tested, identifying the acoustic wave characteristic excited by the leakage point and recording the receiving time of the reverse stress wave;
calculating the sound velocity of the stress wave propagating in the pipeline according to the lengths of the head end and the tail end of the pipeline, the stress wave starting time and the stress wave receiving time;
calculating the time length of the stress wave from the downstream port to the pipeline leakage point according to the stress wave starting time and the opposite direction stress wave receiving time generated by the pipeline leakage point;
and calculating the distance between the pipeline leakage point and the downstream port according to the sound velocity of the stress wave propagating in the pipeline and the time length of the stress wave from the downstream port to the pipeline leakage point.
3. The pipe leak source positioning device according to claim 1, wherein the first acoustic emission sensor and the second acoustic emission sensor are respectively installed near an upstream port and a downstream port of the pipe to be measured, and a distance between the two acoustic emission sensors is a length of the pipe to be measured.
4. The pipeline leak source positioning device according to claim 1, wherein the acoustic emission sensor is vertically mounted on the outer side wall of the pipeline to be tested through a G1/2 interface ball valve.
5. The pipe leak location device of claim 1, further comprising an acquisition controller for receiving the acoustic emission sensor signal and remotely transmitting to the data processing unit.
6. The pipeline leakage point positioning device of claim 4, wherein the acquisition controller comprises a GPS time service module, and the GPS time service module is used for ensuring the synchronous accuracy of the acquisition at the two ends of the pipeline to be detected.
7. The pipe leak location device of claim 4, wherein the collection controller comprises a 4G wireless module, the 4G wireless module configured to transmit stress wave data to the data processing unit.
8. A pipeline leakage point positioning method based on acoustic emission response is characterized by comprising the following steps:
closing or reducing a downstream port pipeline control valve of a downstream port of a pipeline to be tested so as to generate stress waves from the downstream port to an upstream port in the pipeline to be tested; the stress wave is generated by fluid in the pipeline after the fluid in the pipeline is blocked by the valve;
receiving stress waves near a downstream port of the pipeline to be tested and opposite stress waves generated by a pipeline leakage point; receiving stress waves near an upstream port of the pipeline to be tested;
and calculating to obtain the position of the leakage point of the pipeline according to the stress wave near the downstream port of the pipeline to be tested, the reverse stress wave generated by the leakage point of the pipeline and the stress wave near the upstream port of the pipeline to be tested.
9. The method for locating the leakage point of the pipeline according to claim 8, wherein an upstream port of the pipeline to be tested is provided with an upstream port control valve; and controlling the fluid pressure and the fluid flow in the pipeline to be tested through the downstream port valve and the upstream port valve.
10. The method according to claim 8, wherein the step of calculating the position of the pipe leak point according to the stress wave near the downstream port of the pipe to be measured, the reverse stress wave generated by the pipe leak point, and the stress wave near the upstream port of the pipe to be measured specifically comprises:
identifying initial sound wave characteristics according to the stress wave near the downstream port of the pipeline to be tested and recording the initial time of the stress wave; identifying the sound wave reaching characteristics according to the stress wave near the upstream port of the pipeline to be tested and recording the stress wave receiving time; according to the reverse stress wave generated by the pipeline leakage point near the downstream port of the pipeline to be tested, identifying the acoustic wave characteristic excited by the leakage point and recording the receiving time of the reverse stress wave;
calculating the sound velocity of the stress wave propagating in the pipeline according to the lengths of the head end and the tail end of the pipeline, the stress wave starting time and the stress wave receiving time;
calculating the time length of the stress wave from the downstream port to the pipeline leakage point according to the stress wave starting time and the opposite direction stress wave receiving time generated by the pipeline leakage point;
and calculating the distance between the pipeline leakage point and the downstream port according to the sound velocity of the stress wave propagating in the pipeline and the time length of the stress wave from the downstream port to the pipeline leakage point.
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