CN108050394B - Gas pipeline leakage detection positioning experiment platform based on sound pressure signal identification - Google Patents
Gas pipeline leakage detection positioning experiment platform based on sound pressure signal identification Download PDFInfo
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- CN108050394B CN108050394B CN201711291102.3A CN201711291102A CN108050394B CN 108050394 B CN108050394 B CN 108050394B CN 201711291102 A CN201711291102 A CN 201711291102A CN 108050394 B CN108050394 B CN 108050394B
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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
- F17D5/02—Preventing, monitoring, or locating loss
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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
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/007—Leak detector calibration, standard leaks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
- G01M3/243—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations for pipes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
Abstract
The invention provides a gas pipeline leakage detection positioning experimental platform based on sound pressure signal identification, which comprises a simulated gas conveying pipe network, a simulated leakage device, a medium conveying device and a sound pressure signal detection device, wherein the simulated gas conveying pipe network is connected with the medium conveying device through a pipeline; two simulated leakage devices are arranged on each simulated pipeline of the simulated gas conveying pipe network, and the pipeline leakage process is simulated by the combination mode of a proportional valve and a flowmeter respectively; the sound wave sensor, the pressure difference sensor, the pressure sensor and the temperature sensor on each simulation pipeline respectively detect a sound wave signal, a pressure difference signal, a pressure signal and a temperature signal generated by leakage, the sound wave signal, the pressure difference signal, the pressure signal and the temperature signal are collected by a data acquisition card and transmitted to a computer for analysis, and the leakage position of the pipeline is calculated. The invention can simulate various leakage working conditions, can realize the detection and the positioning experiment of the gas pipeline leakage under various leakage working conditions, provides the reliability experiment research for the gas pipeline leakage detection and positioning technology, and is beneficial to reducing the false alarm rate and the false alarm rate of the real pipeline leakage.
Description
Technical Field
The invention relates to a scientific research experiment platform, in particular to a gas pipeline leakage detection positioning experiment platform based on sound pressure signal recognition.
Background
The town gas pipe network system is an important city infrastructure and provides common public service for production and life of town residents. Along with the increasing popularization of town gas use and the continuous construction and development of gas pipe networks, gas leakage accidents caused by corrosion perforation of pipelines, third-party damage, human reasons and the like occur occasionally, so that huge economic loss and environmental pollution are brought, and serious casualty accidents can be brought.
At present, most of gas management companies mainly adopt methods for town gas leakage detection, such as odorizing natural gas, and searching for a leakage point by field observation or judgment by using a pipe network leak detector. The method for detecting and positioning the pipeline leakage has great limitation in practical application, and is mainly characterized in that: the buried gas pipeline is complex in geographical position and surrounding environment, so that the smell is not clear easily and is difficult to distinguish accurately; secondly, the special odor caused by gas leakage needs to be judged manually, and the rapidness and the accuracy of positioning the pipeline leakage cannot be realized; and thirdly, early warning of third-party damage accidents is difficult to achieve. In order to facilitate the research on the operation characteristics, leakage characteristics and mechanism of the gas pipeline and a practical and rapid leakage detection method, it is necessary to develop a set of experimental device for simulating the leakage detection and positioning of the gas pipeline to carry out scientific research, so as to quickly and accurately acquire information and confirm a leakage point when a gas pipeline leakage accident occurs, so as to timely and effectively implement emergency rescue and furthest suppress the occurrence of the gas accident and the damage caused by the gas accident.
At present, research on urban gas leakage detection at home and abroad is mainly based on theoretical analysis, few experimental verifications are available, the research is limited to actual conditions of current research schools of various departments, the experimental research on pipeline leakage detection positioning is very few, on one hand, existing experiment tables are mostly used for liquid experiments, the experiments are rough, and the deviation between a simulated leakage process and an actual process is large. On the other hand, the existing experiment table is mostly a straight pipeline experiment table with a simple structure, the leakage process is simulated in a mode of directly opening a hole on a valve or a pipeline, the operation condition of the complex pipeline cannot be simulated by the simulated pipeline, and in addition, the error is large in the measurement of the sudden leakage condition of the simulated pipeline due to the fact that a data acquisition system is not perfect enough. Therefore, the research on the aspect of urban gas pipeline leakage detection can be overcome by researching and developing a set of experimental device for simulating gas pipeline leakage detection and positioning, and the experimental device has practical value and scientific innovation for promoting the development of gas pipeline safety inspection technology.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a gas pipeline leakage detection and positioning experimental platform based on sound pressure signal identification, which can simulate different leakage working conditions of various pipelines, is complete in data acquisition system, is accurate in positioning of pipeline leakage positions, and provides reliable experimental research for gas pipeline leakage detection and positioning.
The technical scheme of the invention is as follows:
the utility model provides a gas pipeline leak testing location experiment platform based on acoustic pressure signal discernment, its key lies in: the device comprises a simulated gas conveying pipe network, a simulated leakage device, a medium conveying device and a sound pressure signal detection device;
the simulated gas conveying pipe network is formed by networking three simulated pipelines with different diameters, the simulated pipeline I and the simulated pipeline II are positioned on the same vertical plane, the simulated pipeline II and the simulated pipeline III are positioned on the same horizontal plane, and the three simulated pipelines are integrally 3% in gradient;
the simulation leakage device is characterized in that a leakage hole is formed in the wall of a simulation pipeline, a proportional valve and a flowmeter are installed on the leakage hole, the fixed leakage amount is simulated through the control of the proportional valve, two simulation leakage devices are arranged on each simulation pipeline, and a first simulation leakage device and a second simulation leakage device are sequentially arranged along the transmission direction of a simulation pipeline medium;
the medium conveying device comprises a simulated gas conveying pipe network, a pressure regulating valve, an energy medium system, a simulated pipeline inlet valve and a simulated pipeline outlet valve; each simulation pipeline inlet is provided with a simulation pipeline inlet valve, and each simulation pipeline outlet is provided with a simulation pipeline outlet valve; the output end of the energy medium system is connected with the inlet end of the pressure regulating valve, the outlet end of the pressure regulating valve is connected with the inlet of the simulated gas conveying pipe network, and the energy medium system conveys media to the simulated gas conveying pipe network through the pressure regulating valve and controls the pressure grade of the simulated gas conveying pipe network;
the sound pressure signal detection device comprises a pressure gauge, a temperature sensor, a pressure sensor, a differential pressure sensor, a sound wave sensor, a high-precision dynamic signal data acquisition card, a general analog signal data acquisition card and a computer; each simulation pipeline is provided with a pressure gauge, a temperature sensor, a pressure difference sensor and a sound wave sensor in sequence along the medium transmission direction at the upstream end of the first simulation leakage device, two sound wave sensors are arranged between the two simulation leakage devices, and the sound wave sensor, the pressure difference sensor, the pressure sensor, the temperature sensor and the pressure gauge are arranged in sequence along the medium transmission direction of the pipeline at the downstream end of the second simulation leakage device; the output end of the acoustic wave sensor is connected with the input end of the high-precision dynamic signal data acquisition card, and the output end of the high-precision dynamic signal data acquisition card is connected with the computer; the output ends of the temperature sensor, the pressure sensor and the differential pressure sensor are connected with the input end of a general analog signal data acquisition card, and the output end of the general analog signal data acquisition card is connected with a computer; the data acquisition card can acquire signals of the sound wave sensor, the pressure sensor, the differential pressure sensor and the temperature sensor and transmit the signals to the computer for analysis.
According to the technical scheme, a set of simulation experiment platform capable of realizing the collection of the operation parameters of the gas pipeline and the detection and positioning of the leakage is designed by applying the latest theory and research result of the development of the current gas pipeline detection technology and the leakage judgment method based on the pressure and sound wave signal interactive recognition.
Two simulation leakage devices are arranged on each simulation pipeline of the simulation gas conveying pipe network, the pipeline leakage process is simulated through a combination mode of a proportional valve and a flowmeter respectively, wherein the proportional valve simulates the leakage size through controlling the opening degree, and the flowmeter measures the leakage amount. Can be as required, through simulation pipeline inlet valve and the simulation pipeline outlet valve on the different simulation pipelines of switching, optionally do the experiment of a long straight pipeline, also can do the experiment of the pipe network system that comprises two pipelines or three pipelines simultaneously. On one hand, the experimental study of the leakage working conditions of long straight pipelines and complex annular pipe networks with different pipe diameters can be simulated, and on the other hand, the experimental study of the leakage working conditions of leakage quantities of different levels such as micro-hole leakage and small-hole leakage can be simulated by controlling the opening of the proportional valve.
The sound wave sensor, the pressure difference sensor, the pressure sensor and the temperature sensor on each simulation pipeline respectively detect a sound wave signal, a pressure difference signal, a pressure signal and a temperature signal generated by leakage, and the sound wave signal, the pressure difference signal, the pressure signal and the temperature signal of each simulation pipeline are acquired through the high-precision dynamic signal data acquisition card and the general analog signal data acquisition card. The collected sound wave signal, pressure difference signal, pressure signal and temperature signal are transmitted to computer for analysis and processing to calculate the leakage position of pipeline.
The basic principle of gas pipeline leakage detection and positioning is as follows: when the pipeline leaks, an acoustic signal is generated, and the pressure drop is caused at the leaking position to form a pressure signal. The pressure signal has instantaneous pressure drop, while the sound wave signal has instantaneous sound intensity rise, one rise and one fall of the two signals become the obvious characteristics of pipeline leakage, and the leakage real-time detection can be realized by capturing signals through the sound wave sensor, the pressure sensor and the like which are arranged at the two ends of the pipeline; the pressure signal is periodically fluctuated within the duration time after the leakage occurs, and the sound intensity signal is always kept at a high level, so that the continuous detection of the leakage can be realized. Meanwhile, due to the fact that propagation speeds of characteristic signals such as negative pressure waves, sound waves and the like caused by pipeline leakage in different media are different, information coupling between the two signals can be achieved according to measured time differences of the different signals to determine the location of the leakage.
Preferably, a common end inlet valve is arranged on a common end pipeline of inlets of the simulation pipeline II and the simulation pipeline III, and a common end outlet valve is arranged on a common end pipeline of outlets of the simulation pipeline II and the simulation pipeline III.
Therefore, one simulation pipeline experiment, two simulation pipeline experiments or three simulation pipeline experiments can be conveniently performed through valve control selection, and the experiment operation is convenient.
Preferably, the outlet of the simulated gas conveying pipe network is sealed by a blind plate, a sewage branch is further arranged at the lower end of the outlet of the pipe network, and a sewage valve is arranged on the branch, so that the pipeline can be swept and drained. And after the experiment is finished, the medium in the pipeline is discharged from the drain valve.
Preferably, a safety vent valve is arranged at the high end of the simulated gas conveying pipe network and used for overpressure protection and medium venting of the pipe network.
Preferably, the sizes of the analog pipeline I, the analog pipeline II and the analog pipeline III are DN50, DN100 and DN150 respectively.
Preferably, the energy medium system comprises an air compressor, a check valve, a first ball valve, a second ball valve, a vortex shedding flowmeter and a third ball valve which are connected in sequence; and the second ball valve is connected in parallel with a drying pipeline, and the drying pipeline comprises a fourth ball valve, a dryer and a fifth ball valve which are sequentially connected.
Therefore, dry compressed air simulation natural gas can be introduced into the simulation gas conveying pipe network through the medium system, and the simulation gas conveying pipe network is closer to the actual working condition.
The invention has the beneficial effects that:
1. the gas pipeline leakage detection and positioning experiment platform based on pressure and sound wave signal interactive recognition collects data of various sensors through two data collection cards, the collected data are input into a computer signal processing system, pipeline leakage detection and positioning based on pressure wave and sound wave signal interactive recognition are realized in a computer, and by combining software and hardware, the false alarm rate and the missing report rate can be effectively reduced, and the positioning precision is improved.
2. On one hand, the current main pipeline leakage detection experiment system is limited to be capable of detecting sudden leakage with the aperture ratio of more than 10% -20%, and positioning cannot be carried out on tiny slow leakage. On the other hand, the existing experimental systems mostly simulate the leakage process by directly opening holes on a valve or a pipeline. The experimental platform can simulate the experimental study of leakage working conditions of different leakage amounts such as micro-hole leakage, small-hole leakage and the like by controlling the leakage amount.
3. The experiment under the multiple leakage operating mode condition of simulation can be realized among gas pipeline leak testing and the location experiment, including the influence to leaking acoustic pressure signal detection effect such as the pipeline flow of difference, the pipeline of different pressure grades, different pipe diameters, the leakage quantity of difference.
4. The experimental system for detecting gas leakage at home and abroad is a straight pipeline experiment table with a simple structure, on one hand, the experimental pipeline can not simulate the operation condition of a complex pipeline, on the other hand, the error is large for the measurement of the sudden leakage condition of the pipeline due to the insufficient perfection of a data acquisition system. The experiment platform can simulate the running condition of a straight pipeline and the running condition of a complex annular pipeline.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural diagram of the present invention in an embodiment;
FIG. 2 is a schematic diagram of the energy medium system of FIG. 1;
FIG. 3 is a schematic diagram of the detection and location of a pipeline leak;
in the drawings: 1-an energy mediating system; 2-a pressure control valve; 3-simulating a pipe inlet valve; 4-a flange; 5-a pressure gauge; 6-temperature sensor; 7-a pressure sensor; 8-differential pressure sensor; 9-an acoustic wave sensor; 10-a simulated leakage device; 10 a-a proportional valve; 10 b-a flow meter; 10 c-a leak hole; 11-common port inlet valve; 12-safety vent valve; 13-a blow-down valve; 14-a blind plate; 15-general data acquisition card; 16-high precision dynamic signal data acquisition card; 17-a computer; 18-an air compressor; 19-a stop valve; 20-a first ball valve; 21-a second ball valve; 22-vortex shedding flowmeter; 23-a third ball valve; 24-a fourth ball valve; 25-a fifth ball valve; 26-a dryer; 27-simulating a pipeline outlet valve; 28-common port outlet valve; 29-conveying pipe network.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
In the present embodiment, the terms "upper", "lower", "left", "right", "front", "rear", "upper end", "lower end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present invention.
The gas pipeline leakage detection and positioning experimental platform based on sound pressure signal identification as shown in fig. 1 comprises a simulated gas conveying pipe network, a simulated leakage device, a medium conveying device and a sound pressure signal detection device.
Simulation gas delivery pipe network 29 comprises the simulation pipeline network deployment of three different diameters, and simulation pipeline I is located same perpendicular with simulation pipeline II, and simulation pipeline II and simulation pipeline III are located same horizontal plane, and three whole slopes that are 3% of simulation pipeline, every simulation pipeline accessible flange 4 extension according to particular case.
The simulation leakage device 10 is characterized in that a leakage hole 10c is formed in the wall of the simulation pipeline, a proportional valve 10a and a flowmeter 10b are installed on the leakage hole, the leakage amount is controlled and simulated to be fixed through the proportional valve, two simulation leakage devices are arranged on each simulation pipeline, and the first simulation leakage device and the second simulation leakage device are sequentially arranged along the medium direction of the simulation pipeline.
The medium conveying device comprises a simulated gas conveying pipe network 29, a pressure regulating valve 2, an energy medium system 1, a simulated pipeline inlet valve 3 and a simulated pipeline outlet valve 27; each simulation pipeline inlet is provided with a simulation pipeline inlet valve 3, and each simulation pipeline outlet is provided with a simulation pipeline outlet valve 27; the output end of the energy medium system 1 is connected with the inlet end of the pressure regulating valve 2, the outlet end of the pressure regulating valve 2 is connected with the inlet of the simulated gas conveying pipe network 29, and the energy medium system 1 conveys media to the simulated gas conveying pipe network 29 through the pressure regulating valve 2 and controls the pressure grade of the simulated gas conveying pipe network 29.
The sound pressure signal detection device comprises a pressure gauge 5, a temperature sensor 6, a pressure sensor 7, a differential pressure sensor 8, a sound wave sensor 9, a high-precision dynamic signal data acquisition card 15, a general analog signal data acquisition card 16 and a computer 17; each simulation pipeline is provided with a pressure gauge 5, a temperature sensor 6, a pressure sensor 7, a pressure difference sensor 8 and a sound wave sensor 9 in sequence along the medium transmission direction at the upstream end of the first simulation leakage device, two sound wave sensors 9 are arranged between the two simulation leakage devices, and the sound wave sensor 9, the pressure difference sensor 8, the pressure sensor 7, the temperature sensor 6 and the pressure gauge 5 are arranged in sequence along the pipeline medium transmission direction at the downstream end of the second simulation leakage device; the output end of the acoustic wave sensor 9 is connected with the input end of a high-precision dynamic signal data acquisition card 15, and the output end of the high-precision dynamic signal data acquisition card is connected with a computer 17; the output ends of the temperature sensor 6, the pressure sensor 7 and the differential pressure sensor 8 are connected with the input end of a general analog signal data acquisition card 16, and the output end of the general analog signal data acquisition card 16 is connected with a computer 17. The two data acquisition cards can acquire signals of the acoustic wave sensor, the pressure sensor, the differential pressure sensor and the temperature sensor and transmit the signals to the computer 17 for analysis.
Two simulated leakage devices 10 are arranged on each simulated pipeline of the simulated gas conveying pipe network 29, the pipeline leakage process is simulated by a combination mode of a proportional valve and a flowmeter respectively, wherein the proportional valve 10a controls the opening degree of a leakage hole 10c, and the flowmeter 10b meters the leakage amount. The simulation pipeline inlet valve 3 and the simulation pipeline outlet valve 27 on different simulation pipelines can be opened and closed as required, so that an experiment of a long straight pipeline can be selected, and an experiment of a pipe network system consisting of two pipelines or three pipelines can be performed simultaneously. On one hand, the experimental study of the leakage working conditions of long straight pipelines and complex annular pipe networks with different pipe diameters can be simulated, and on the other hand, the experimental study of the leakage working conditions of leakage quantities of different levels such as micro-hole leakage and small-hole leakage can be simulated by controlling the opening of the proportional valve.
And the sound wave sensor, the differential pressure sensor, the pressure sensor and the temperature sensor on each analog pipeline respectively detect a sound wave signal, a differential pressure signal, a pressure signal and a temperature signal generated by leakage. And collecting the sound wave signal, the pressure difference signal, the pressure signal and the temperature signal of each simulation pipeline through a high-precision dynamic signal data acquisition card and a general analog signal data acquisition card. The collected sound wave signal, pressure difference signal, pressure signal and temperature signal are transmitted to computer for analysis and processing to calculate the leakage position of pipeline.
The basic principle of the leakage detection and positioning of the gas pipeline is as follows: when the pipeline leaks, an acoustic signal is generated, and the pressure drop is caused at the leaking position to form a pressure signal. The pressure signal has instantaneous pressure drop, while the sound wave signal has instantaneous sound intensity rise, one rise and one fall of the two signals become the obvious characteristics of pipeline leakage, and the leakage real-time detection can be realized by capturing signals through the sound wave sensor, the pressure sensor and the like which are arranged at the two ends of the pipeline; the pressure signal is periodically fluctuated within the duration time after the leakage occurs, and the sound intensity signal is always kept at a high level, so that the continuous detection of the leakage can be realized. Meanwhile, due to the fact that propagation speeds of characteristic signals such as negative pressure waves, sound waves and the like caused by pipeline leakage in different media are different, information coupling between the two signals can be achieved according to measured time differences of the different signals to determine the location of the leakage.
Preferably, a common end inlet valve 11 is arranged on a common end pipeline of the inlets of the simulation pipeline II and the simulation pipeline III, and a common end outlet valve 28 is arranged on a common end pipeline of the outlets of the simulation pipeline II and the simulation pipeline III. Therefore, the experiment of selecting one simulation pipeline straight pipeline, the experiment of two simulation pipelines or the experiment of a pipe network system consisting of three simulation pipelines can be controlled by the valve more conveniently, and the experiment operation is convenient.
Preferably, the outlet of the simulated gas conveying pipe network 29 is sealed by a blind plate 14, a sewage discharge branch is further arranged at the lower end of the outlet of the pipe network, and a sewage discharge valve 13 is arranged on the branch, so that the pipeline can be purged and discharged. And after the experiment is finished, the medium in the pipeline is discharged from the drain valve.
Preferably, a safety vent valve 12 is arranged at the high end of the simulated gas delivery pipe network 29 for overpressure protection and medium venting of the pipe network.
Preferably, the sizes of the analog pipeline I, the analog pipeline II and the analog pipeline III are DN50, DN100 and DN150 respectively.
Preferably, as shown in fig. 2, the energy-medium system 1 includes an air compressor 18, a check valve 19, a first ball valve 20, a second ball valve 21, a vortex flowmeter 22, and a third ball valve 23; a drying pipeline is connected in parallel to the second ball valve 21, and the drying pipeline comprises a fourth ball valve 24, a dryer 26 and a fifth ball valve 25 which are connected in sequence. Therefore, the simulation natural gas can be closer to the actual working condition by introducing dry compressed air into the simulation gas conveying pipe network through the medium system.
The applicable pressure of the experimental platform is less than or equal to 1.2MPa, when the experimental platform works, air is compressed by the air compressor 18, dry gas is input into the dryer 26, then the dry gas is input into the simulated gas conveying pipe network 29, experimental media are provided for an experimental simulation system, and the air media respectively enter the leakage simulation pipelines with different pipe diameters by controlling the simulated gas conveying pipe network 29 and various control valves on each simulation pipeline. The opening of the leakage hole 10b is controlled by controlling the proportional valves 10a on the three simulation pipelines, and the experimental study of the leakage working conditions of leakage quantities of different levels such as tiny hole leakage, small hole leakage and the like is simulated.
When the simulation pipeline leaks, an acoustic signal is generated, and a pressure signal is formed because the pressure drop is caused at the leaking position. The pressure signal has instantaneous pressure drop, while the sound wave signal has instantaneous sound intensity rise, one rise and one fall of the two signals become the obvious characteristics of pipeline leakage, and the leakage real-time detection can be realized by capturing signals through the sound wave sensor, the pressure sensor and the like which are arranged at the two ends of the pipeline; the pressure signal is periodically fluctuated within the duration time after the leakage occurs, and the sound intensity signal is always kept at a high level, so that the continuous detection of the leakage can be realized. Meanwhile, due to the fact that propagation speeds of characteristic signals such as negative pressure waves, sound waves and the like caused by pipeline leakage in different media are different, information coupling between the two signals can be achieved according to measured time differences of the different signals to determine the location of the leakage.
The length of the pipeline between the upstream station and the downstream station A, B is L (m) as shown in FIG. 3; the distance of the leakage point from the upstream point A is x (m); the propagation velocity of negative pressure waves in the pipeline transmission medium is v (m/s); the time when the upstream and downstream sensors receive the negative pressure wave is t1，t2(s). Then there are:
finishing to obtain:
x is the desired location distance.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.
Claims (6)
1. The utility model provides a gas pipeline leak testing location experiment platform based on acoustic pressure signal discernment which characterized in that: the device comprises a simulated gas conveying pipe network, a simulated leakage device, a medium conveying device and a sound pressure signal detection device;
the simulated gas conveying pipe network is formed by networking three simulated pipelines with different diameters, the simulated pipeline I and the simulated pipeline II are positioned on the same vertical plane, the simulated pipeline II and the simulated pipeline III are positioned on the same horizontal plane, and the three pipelines are integrally 3% in gradient;
the simulation leakage device is characterized in that a leakage hole is formed in the wall of a simulation pipeline, a proportional valve and a flowmeter are installed on the leakage hole, the fixed leakage amount is simulated through the control of the proportional valve, two simulation leakage devices are arranged on each simulation pipeline, and a first simulation leakage device and a second simulation leakage device are sequentially arranged along the transmission direction of a simulation pipeline medium;
the medium conveying device comprises a simulated gas conveying pipe network, a pressure regulating valve, an energy medium system, a simulated pipeline inlet valve and a simulated pipeline outlet valve; each simulation pipeline inlet is provided with a simulation pipeline inlet valve, and each simulation pipeline outlet is provided with a simulation pipeline outlet valve; the output end of the energy medium system is connected with the inlet end of the pressure regulating valve, the outlet end of the pressure regulating valve is connected with the inlet of the simulated gas conveying pipe network, and the energy medium system conveys media to the simulated gas conveying pipe network through the pressure regulating valve and controls the pressure grade of the simulated gas conveying pipe network;
the sound pressure signal detection device comprises a pressure gauge, a temperature sensor, a pressure sensor, a differential pressure sensor, a sound wave sensor, a high-precision dynamic signal data acquisition card, a general analog signal data acquisition card and a computer; each simulation pipeline is provided with a pressure gauge, a temperature sensor, a pressure difference sensor and an acoustic wave sensor in sequence along the medium transmission direction at the upstream end of the first simulation leakage device, two acoustic wave sensors are arranged between the two simulation leakage devices, and the acoustic wave sensor, the pressure difference sensor, the pressure sensor, the temperature sensor and the pressure gauge are arranged in sequence along the medium transmission direction of the pipeline at the downstream end of the second simulation leakage device; the output end of the acoustic wave sensor is connected with the input end of a high-precision dynamic signal data acquisition card, the output end of the high-precision dynamic signal data acquisition card is connected with a computer, the output ends of the temperature sensor, the pressure sensor and the pressure difference sensor are connected with the input end of a general analog signal data acquisition card, and the output end of the general analog signal data acquisition card is connected with the computer; the data acquisition card can acquire signals of the sound wave sensor, the pressure sensor, the differential pressure sensor and the temperature sensor and transmit the signals to the computer for analysis.
2. The gas pipeline leakage detection and positioning experiment platform based on sound pressure signal identification as claimed in claim 1, wherein: and a common end inlet valve is arranged on a common end pipeline of the inlets of the simulation pipeline II and the simulation pipeline III, and a common end outlet valve is arranged on a common end pipeline of the outlets of the simulation pipeline II and the simulation pipeline III.
3. The gas pipeline leakage detection and positioning experiment platform based on sound pressure signal identification as claimed in claim 1, wherein: the simulated gas delivery pipe network outlet is sealed by adopting a blind plate, a sewage branch is further arranged at the lower end of the pipe network outlet, and a sewage valve is arranged on the branch, so that the pipeline can be swept and drained.
4. The gas pipeline leakage detection and positioning experiment platform based on sound pressure signal identification as claimed in claim 1, wherein: the high end of the simulated gas conveying pipe network is provided with a safety vent valve for overpressure protection and medium venting of the pipe network.
5. The gas pipeline leakage detection and positioning experiment platform based on sound pressure signal identification as claimed in claim 1, wherein: the sizes of the simulation pipeline I, the simulation pipeline II and the simulation pipeline III are DN50, DN100 and DN150 respectively.
6. The gas pipeline leakage detection and positioning experiment platform based on sound pressure signal identification as claimed in claim 1, wherein: the energy medium system comprises an air compressor, a check valve, a first ball valve, a second ball valve, a vortex shedding flowmeter and a third ball valve which are connected in sequence; and the second ball valve is connected in parallel with a drying pipeline, and the drying pipeline comprises a fourth ball valve, a dryer and a fifth ball valve which are sequentially connected.
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