CN108050394A - Fuel gas pipeline leakage based on sound pressure signal identification detects positioning experiment platform - Google Patents
Fuel gas pipeline leakage based on sound pressure signal identification detects positioning experiment platform Download PDFInfo
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- CN108050394A CN108050394A CN201711291102.3A CN201711291102A CN108050394A CN 108050394 A CN108050394 A CN 108050394A CN 201711291102 A CN201711291102 A CN 201711291102A CN 108050394 A CN108050394 A CN 108050394A
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- 239000002737 fuel gas Substances 0.000 title claims abstract description 50
- 238000004088 simulation Methods 0.000 claims abstract description 110
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims 1
- 239000000567 combustion gas Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 21
- 238000002474 experimental method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 230000000644 propagated Effects 0.000 description 3
- 230000001052 transient Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000000630 rising Effects 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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
-
- 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 present invention provides a kind of fuel gas pipeline leakages based on sound pressure signal identification to detect positioning experiment platform, including simulation fuel gas transmission pipe network, simulated leakage device, medium conveying apparatus, sound pressure signal detection device；Two simulated leakage devices are set on every simulation pipeline of simulation fuel gas transmission pipe network, and pipe leakage process is simulated respectively by the combination of proportioning valve and flowmeter；Sonic sensor, differential pressure pickup, pressure sensor, temperature sensor on every simulation pipeline detect acoustic signals, pressure difference signal, pressure signal, the temperature signal that leakage generates respectively, it is gathered by data collecting card and passes to computer and analyzed, calculate pipe leakage position.The present invention can simulate a variety of leakage operating modes, it can realize fuel gas pipeline leakage detection and the positioning experiment simulated under a variety of leakage operating modes, experimental Research on Reliability is provided for fuel gas pipeline leakage detection and location technology, advantageously reduces true pipe leakage rate of false alarm and rate of failing to report.
Description
Technical field
The present invention relates to a kind of research experiments platforms, are specially a kind of fuel gas pipeline leakage inspection based on sound pressure signal identification
Survey positioning experiment platform.
Background technology
City gas pipe network system is important urban infrastructure, is provided generally for the production and living of town dweller
Public service.With city gas use become increasingly popular, the continuous development of gas ductwork, because the corrosion failure of pipeline,
Gas leakage event happens occasionally caused by damage from third-party and artificial origin etc., not only brings huge economic loss and ring
It pollutes in border, it is also possible to bring great personnel casualty accidents.
The method that most civil gas management companies mainly use in city gas leak detection at this stage is to natural
Gas adds smelly, and the methods of being judged by field observation or using leakage survey of gas network instrument finds leak source.This pipeline leakage testing and
The method of positioning has significant limitation in practical applications, is mainly shown as：First, geographical location residing for steel gas pipe underground
It is complicated with ambient enviroment, it is unintelligible to be easy to cause smell, it is difficult to accurate to differentiate；2nd, off-odor caused by gas leakage needs
It is artificial to judge, it can not realize the rapidity and accuracy of pipe leakage positioning；3rd, it is difficult to that damage from third-party accident is accomplished to shift to an earlier date
Early warning.In order to facilitate research gas pipeline operation characteristic, feature and mechanism and practical quick leakage detection method are leaked,
It is necessary to research and develop the experimental provision of a set of simulation fuel gas pipeline leakage detection positioning to carry out scientific research, realize and Gas Pipe is occurring
Information can be fast and accurately obtained during road leakage accident and confirms leak source, timely and effectively to implement emergency management and rescue, maximum limit
Degree ground containment gas accidents generation and caused by damage.
At present, the research in terms of city gas leak detection both at home and abroad is rare to test mainly based on theory analysis
Card is limited to the actual conditions of current each research institutions, and the experimental study of pipeline leakage testing positioning is very few, on the one hand existing reality
It is also mostly, which to test platform, is tested for liquid, and experiment is rougher, and simulated leakage process and real process deviation are larger.On the other hand
Existing experimental bench is mostly straight pipeline experimental bench simple in structure, by the form of direct perforate on valve or pipeline come simulated leakage
Process, this analoglike pipeline can not simulate complicated conduit running operating mode, incomplete additionally, due to data collecting system, to simulation
The measure of pipeline Sudden Leakage situation, error are larger.Therefore, the reality positioned by researching and developing a set of simulation fuel gas pipeline leakage detection
Experiment device can make up the current domestic deficiency studied in terms of town gas pipe leak detection, to gas pipeline is promoted to examine safely
Looking into technology development has real value and science innovation.
The content of the invention
For in the prior art the defects of, the present invention provide it is a kind of based on sound pressure signal identification fuel gas pipeline leakage detection
Positioning experiment platform can simulate the different leakage operating modes of pipelines, and data collecting system is perfect, and pipe leakage position is determined
Level is true, and reliable experimental study is provided for fuel gas pipeline leakage detection positioning.
Technical solution of the present invention is as follows：
A kind of fuel gas pipeline leakage based on sound pressure signal identification detects positioning experiment platform, and key is：Including mould
Intend fuel gas transmission pipe network, simulated leakage device, medium conveying apparatus, sound pressure signal detection device；
The simulation fuel gas transmission pipe network is made of the simulation pipeline networking of three different-diameters, simulation pipeline I and simulation
Pipeline II is located at same vertical plane, and simulation pipeline II and simulation pipeline III are located at same level, and three simulation pipelines are whole
In 3% gradient；
The simulated leakage device is to open up leak on simulation duct wall, and proportioning valve and flow are equipped on leak
Meter is simulated fixed leakage rate by proportional valve control, is all provided on every simulation pipeline there are two simulated leakage device, along simulation pipe
Track media transmission direction is followed successively by the first simulated leakage device, the second simulated leakage device；
The medium conveying apparatus includes simulation fuel gas transmission pipe network, pressure-regulating valve, the system that can be situated between, simulation entrance
Valve, simulation pipe outlet valve；Every simulation entrance is equipped with simulation entrance valve, and outlet is equipped with simulation pipe outlet
Valve；The system output that can be situated between is connected with the pressure-regulating valve arrival end, and the pressure-regulating valve port of export is fired with simulation
Letter shoot web portal is connected, and the system that can be situated between to simulation fuel gas transmission pipe network pumped (conveying) medium and is controlled by pressure-regulating valve
Simulate fuel gas transmission pipe network pressure rating；
The sound pressure signal detection device includes pressure gauge, temperature sensor, pressure sensor, differential pressure pickup, sound wave
Sensor, Dynamic High-accuracy signal data acquisition card, generic analog signal data collecting card, computer；The every simulation pipe
Road is equipped with pressure gauge, temperature sensor, pressure sensing successively in the upstream end of the first simulated leakage device along medium transmission direction
Device, differential pressure pickup, sonic sensor are set between two simulated leakage devices there are two sonic sensor, in the second simulation
The downstream of leakage device is equipped with sonic sensor, differential pressure pickup, pressure sensor, temperature successively along pipeline medium transmission direction
Spend sensor, pressure gauge；The output terminal of the sonic sensor is connected with the input terminal of Dynamic High-accuracy signal data acquisition card,
The output terminal of Dynamic High-accuracy signal data acquisition card is connected with computer；The temperature sensor, pressure sensor and pressure difference
Sensor output is connected with generic analog signal data collecting card input terminal, the generic analog signal data collecting card output
End is connected with computer；Data collecting card can gather sonic sensor, pressure sensor, differential pressure pickup, temperature sensor
Signal and transmit a signal to computer and analyzed.
According to the above-mentioned technical solution, the latest theories and grind that the present invention develops with current Detection Technique of Gas Pipeline
Study carefully achievement, devising a set of can realize based on the leak judgment method that pressure and sound wave signal interaction identify transports gas pipeline
Row parameter acquisition and the simulation experiment platform of leak detection positioning.
Two simulated leakage devices, pipe leakage process point are set on every simulation pipeline of simulation fuel gas transmission pipe network
It is not simulated by the combination of proportioning valve and flowmeter, wherein proportioning valve is by controlling aperture simulated leakage size, flowmeter
Dosing leak amount.Can be as needed, pass through the simulation entrance valve and simulation pipe outlet being opened and closed on different simulation pipelines
Valve, the optional experiment for doing a root long straight pipeline can also do the reality of the pipe network system being made of two pipelines or three pipelines simultaneously
It tests.On the one hand the long straight pipeline of different tube diameters and the experimental study of the leakage operating mode of complicated loop network, the opposing party can be simulated
Face can simulate the examination of the leakage operating mode of the different brackets leakage rate such as micro hole, small hole leaking by controlling the aperture of proportioning valve
Test research.
Sonic sensor, differential pressure pickup, pressure sensor, temperature sensor on every simulation pipeline detect let out respectively
The acoustic signals generated, pressure difference signal, pressure signal, temperature signal are leaked, by Dynamic High-accuracy signal data acquisition card and is led to
Acoustic signals, pressure difference signal, pressure signal, the temperature signal of every simulation pipeline are gathered with analog signal data capture card.It adopts
The acoustic signals that collect, pressure difference signal, pressure signal, temperature signal pass to and Data Analysis Services carried out on computer, calculate
Go out pipeline leak position.
Fuel gas pipeline leakage detects the basic principle with positioning：Moment occurs in pipe leakage, generates an acoustic signals,
Since leak can cause pressure drop, a pressure signal is formed.There is instantaneous pressure drop in pressure signal, and acoustic signals go out
The transient rise of the existing sound intensity, one rise and one drop of two kinds of signals become the notable feature that pipe leakage occurs, can be by being mounted on pipe
The signal acquisitions such as the sonic sensor and pressure sensor at road both ends realize the real-time detection of leakage；Holding after leakage occurs
Within the continuous time, pressure signal forms cyclic fluctuation, and sound intensity signal is always maintained at very high level, then leakage can be achieved
Continuation detects.Simultaneously as the speed that the characteristic signals such as suction wave, sound wave caused by pipe leakage are propagated in different medium
Difference can realize that the information between two kinds of signals couples to determine the positioning of leakage according to the time difference of the unlike signal measured.
Preferably, simulate pipeline II and simulate the common port pipeline of the entrance of pipeline III equipped with common port inlet valve, mould
The common port pipeline intended pipeline II and simulate the outlet of pipeline III is equipped with common port outlet valve.
It is so more convenient that a simulation pipeline experiment, two simulation pipelines experiments or three moulds are done by valve control choosing
Intend pipeline experiment, convenient for experimental implementation.
Preferably, using blind plate sealing, pipe network outlet lower end is additionally provided with blowdown for the simulation fuel gas transmission pipe network outlet
Branch, branch road are equipped with blowdown valve, it can be achieved that purging blowdown to pipeline.After experiment, medium in pipeline is from blowdown valve
Discharge.
Preferably, the high-end safety vent valve that is equipped with of the simulation fuel gas transmission pipe network is put for pipe network overpressure protection and medium
It is empty.
Preferably, it is described simulation pipeline I, simulation pipeline II, simulate pipeline III size be respectively DN50, DN100,
DN150。
Preferably, the system that can be situated between includes the air compressor machine, check-valves, the first ball valve, the second ball valve, the vortex street that are sequentially connected
Flowmeter, the 3rd ball valve；Drying pipeline is parallel at second ball valve, which includes the 4th ball being sequentially connected
Valve, drier, the 5th ball valve.
The system that can so be situated between enters dry compressed air to simulation gas supply pipe Netcom and simulates natural gas, with actual condition
It is more nearly.
Beneficial effects of the present invention：
1st, the fuel gas pipeline leakage identified based on pressure and sound wave signal interaction detects positioning experiment platform, passes through two kinds of numbers
According to the data of capture card acquisition multiple sensors, by the data of acquisition by inputting Computer signal processing system, in computer
It is middle to realize the pipeline leakage testing positioning identified based on pressure wave and sound wave signal interaction, it is combined using software and hardware, Neng Gouyou
Effect reduces rate of false alarm and rate of failing to report, improves positioning accuracy.
2nd, at present on the one hand main pipeline leakage testing experimental system is only limitted to detect aperture ratio 10%~20%
Above accident release to small slow leakage, can not be implemented to position.On the other hand it is mostly to pass through valve to have experimental system
The form of directly perforate carrys out simulated leakage process on door or pipeline.And this experiment porch can be small by the way that leakage rate is controlled to simulate
The experimental study of the leakage operating mode of the difference leakage rate such as hole leakage, small hole leaking.
3rd, can be detected in fuel gas pipeline leakage with realizing a variety of experiments leaked under working conditions of simulation in positioning experiment,
Including different pipeline flows, different pressure ratings, the pipeline of different tube diameters, different leakage rates etc. to leakage sound pressure signal inspection
Survey the influence of effect.
4th, the experimental system both at home and abroad for gas leakage detection is mostly straight pipeline experimental bench simple in structure, such experiment
On the one hand pipeline can not simulate complicated conduit running operating mode, on the other hand since data collecting system is incomplete, dash forward to pipeline
The measure of leakage situation is given vent to, error is larger.This experiment porch can not only simulate straight pipeline operating condition, but also can simulate multiple
Miscellaneous annulus line operating condition.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all of the figs, similar element
Or part is generally identified by similar reference numeral.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is structure diagram of the invention in specific embodiment；
Fig. 2 is the structure diagram of system of being situated between in Fig. 1；
Fig. 3 is pipeline leakage detection and location schematic diagram；
In attached drawing：1- can be situated between system；2- pressure-control valves；3- simulates entrance valve；4- flanges；5- pressure gauges；6- temperature
Spend sensor；7- pressure sensors；8- differential pressure pickups；9- sonic sensors；10- simulated leakage devices；10a- proportioning valves；
10b- flowmeters；10c- leaks；11- common port inlet valves；12- safety vent valves；13- blowdown valves；14- blind plates；15- is general
Data collecting card；16- Dynamic High-accuracy signal data acquisition cards；17- computers；18- air compressor machines；19- shut-off valves；20- first
Ball valve；The second ball valves of 21-；22- vortex-shedding meters；The 3rd ball valves of 23-；The 4th ball valves of 24-；The 5th ball valves of 25-；26- driers；
27- simulates pipe outlet valve；28- common port outlet valves；29- transmission pipeline networks.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
In the present embodiment, the orientation or position of the instructions such as term " on " " under " " left side " " right side " " preceding " " rear " " upper end " " lower end "
It is based on orientation shown in the drawings or position relationship to put relation, is for only for ease of description rather than instruction or implies meaning
Device or element must have specific orientation, with specific azimuth configuration or operation, therefore it is not intended that the present invention's
Limitation.
A kind of fuel gas pipeline leakage based on sound pressure signal identification as shown in Figure 1 detects positioning experiment platform, including mould
Intend fuel gas transmission pipe network, simulated leakage device, medium conveying apparatus, sound pressure signal detection device.
The simulation fuel gas transmission pipe network 29 is made of the simulation pipeline networking of three different-diameters, simulates pipeline I and mould
Intend pipeline II and be located at same vertical plane, simulation pipeline II and simulation pipeline III are located at same level, and three simulation pipelines are whole
In 3% gradient, every simulation pipeline can as the case may be lengthened by flange 4.
The simulated leakage device 10 is to open up leak 10c on simulation duct wall, and proportioning valve is equipped on leak
10a and flowmeter 10b simulates fixed leakage rate by proportional valve control, is all provided with that there are two simulated leakages on every simulation pipeline
Device is followed successively by the first simulated leakage device, the second simulated leakage device along simulation pipeline medium direction.
The medium conveying apparatus includes simulation fuel gas transmission pipe network 29, pressure-regulating valve 2, the system that can be situated between 1, simulation pipeline
Inlet valve 3, simulation pipe outlet valve 27；Every simulation entrance is equipped with simulation entrance valve 3, and outlet is equipped with simulation
Pipe outlet valve 27；1 output terminal of system that can be situated between is connected with 2 arrival end of pressure-regulating valve, and the pressure-regulating valve 2 goes out
Mouthful end is connected with simulation 29 entrance of fuel gas transmission pipe network, and the system 1 that can be situated between is by pressure-regulating valve 2 to simulating gas supply pipe
29 pumped (conveying) medium of net and the pressure rating for controlling simulation fuel gas transmission pipe network 29.
The sound pressure signal detection device include pressure gauge 5, temperature sensor 6, pressure sensor 7, differential pressure pickup 8,
Sonic sensor 9, Dynamic High-accuracy signal data acquisition card 15, generic analog signal data collecting card 16, computer 17；It is described
Every simulation pipeline is equipped with pressure gauge 5, temperature sensing successively in the upstream end of the first simulated leakage device along medium transmission direction
Device 6, pressure sensor 7, differential pressure pickup 8, sonic sensor 9, set between two simulated leakage devices there are two sound wave pass
Sensor 9 is equipped with sonic sensor 9 successively in the downstream of the second simulated leakage device along pipeline medium transmission direction, pressure difference passes
Sensor 8, pressure sensor 7, temperature sensor 6, pressure gauge 5；The output terminal of the sonic sensor 9 and Dynamic High-accuracy signal
The input terminal of data collecting card 15 is connected, and the output terminal of Dynamic High-accuracy signal data acquisition card is connected with computer 17；It is described
Temperature sensor 6, pressure sensor 7 and 8 output terminal of differential pressure pickup and 16 input terminal phase of generic analog signal data collecting card
Even, 16 output terminal of generic analog signal data collecting card is connected with computer 17.Two kinds of data collecting cards can gather sound
Wave sensor, pressure sensor, differential pressure pickup, temperature sensor signal and transmit a signal to computer 17 and divided
Analysis.
Two simulated leakage devices 10, pipe leakage mistake are set on every simulation pipeline of simulation fuel gas transmission pipe network 29
Journey is simulated respectively by the combination of proportioning valve and flowmeter, the aperture of wherein proportioning valve 10a control leaks 10c, flow
Count 10b dosing leak amounts.Can be as needed, it is managed by the simulation entrance valve 3 and simulation that are opened and closed on different simulation pipelines
Road outlet valve 27, the optional experiment for doing a root long straight pipeline can also do the pipe network system that two pipelines or three pipelines form simultaneously
The experiment of system.On the one hand the long straight pipeline of different tube diameters and the experimental study of the leakage operating mode of complicated loop network can be simulated,
On the other hand the leakage work of the different brackets leakage rate such as micro hole, small hole leaking can be simulated by controlling the aperture of proportioning valve
The experimental study of condition.
Sonic sensor, differential pressure pickup, pressure sensor, temperature sensor on every simulation pipeline detect let out respectively
Leak the acoustic signals generated, pressure difference signal, pressure signal, temperature signal.By Dynamic High-accuracy signal data acquisition card and lead to
Acoustic signals, pressure difference signal, pressure signal, the temperature signal of every simulation pipeline are gathered with analog signal data capture card.It adopts
Acoustic signals, pressure difference signal, pressure signal, the temperature signal collected passes to and Data Analysis Services is carried out on computer, calculates
Go out pipeline leak position.
Fuel gas pipeline leakage detects as follows with the basic principle of positioning：Moment occurs in pipe leakage, generates a sound wave
Signal since leak can cause pressure drop, forms a pressure signal.There is instantaneous pressure drop in pressure signal, and sound wave
There is the transient rise of the sound intensity in signal, and one rise and one drop of two kinds of signals becomes the notable feature that pipe leakage occurs, can pass through peace
The real-time detection of leakage is realized mounted in the signal acquisitions such as the sonic sensor of pipe ends and pressure sensor；Occur in leakage
Within duration afterwards, pressure signal forms cyclic fluctuation, and sound intensity signal is always maintained at very high level, then can be achieved
The continuation detection of leakage.Simultaneously as the characteristic signals such as suction wave, sound wave are propagated in different medium caused by pipe leakage
Speed it is different, can realize that the information between two kinds of signals couples to determine leakage according to the time difference of the unlike signal measured
Positioning.
Preferably, the common port pipeline for simulating the entrance of pipeline II and simulation pipeline III is equipped with common port inlet valve 11,
The common port pipeline simulated pipeline II and simulate the outlet of pipeline III is equipped with common port outlet valve 28.It is so more convenient to pass through
Valve controls the pipe network system of the experiment for selecting a simulation pipeline straight pipeline, two simulation pipeline experiments or three simulation pipeline compositions
System experiment, convenient for experimental implementation.
Preferably, 29 outlet of simulation fuel gas transmission pipe network is sealed using blind plate 14, and pipe network outlet lower end is additionally provided with
Blowdown branch, branch road are equipped with blowdown valve 13, it can be achieved that purging blowdown to pipeline.After experiment, medium in pipeline from
Blowdown valve is discharged.
Preferably, the high-end safety vent valve 12 that is equipped with of the simulation fuel gas transmission pipe network 29 is used for pipe network overpressure protection and Jie
Matter is vented.
Preferably, it is described simulation pipeline I, simulation pipeline II, simulate pipeline III size be respectively DN50, DN100,
DN150。
Preferably, as shown in Fig. 2, the system 1 that can be situated between includes the air compressor machine 18, check-valves 19, the first ball that are sequentially connected
Valve 20, the second ball valve 21, vortex-shedding meter 22, the 3rd ball valve 23；Drying pipeline is parallel at second ball valve 21, this is dry
Dry pipeline includes the 4th ball valve 24, drier 26, the 5th ball valve 25 that are sequentially connected.The system that can so be situated between to simulation fuel gas transmission
Pipe network is passed through dry compressed air simulation natural gas and is more nearly with actual condition.
Experiment porch of the present invention is applicable in pressure≤1.2MPa, when which works, is compressed by air compressor machine 18
Air inputs 26 dry gas of drier, then input simulation fuel gas transmission pipe network 29, and providing experiment for experimental simulation system is situated between
Matter by controlling all kinds of control valves on simulation fuel gas transmission pipe network 29 and every simulation pipeline, respectively enters air dielectric
The leakage simulation pipeline of different tube diameters.By the way that the proportioning valve 10a on three simulation pipelines is controlled to control the aperture of leak 10b,
Simulate the experimental study of the leakage operating modes of different brackets leakage rate such as micro hole, small hole leaking.
Moment occurs in simulation pipe leakage, generates an acoustic signals, since leak can cause pressure drop, is formed
One pressure signal.There is instantaneous pressure drop in pressure signal, and the transient rise of the sound intensity occur in acoustic signals, and the one of two kinds of signals
Rising a drop becomes the notable feature that pipe leakage occurs, can be by being mounted on the sonic sensor and pressure sensor of pipe ends
Signal acquisitions is waited to realize the real-time detection of leakage；Within the duration after leakage occurs, pressure signal forms periodicity
Fluctuation, and sound intensity signal is always maintained at very high level, then the continuation detection of leakage can be achieved.Simultaneously as pipe leakage
The speed that the characteristic signals such as caused suction wave, sound wave are propagated in different medium is different, can be according to the unlike signal measured
Time difference realizes that the information between two kinds of signals couples to determine the positioning of leakage.
Duct length is L (m) between upstream and downstream A, B station as shown in Figure 3；Distance of the leakage point away from upstream A points is x (m)；Pipeline
The spread speed of suction wave is v (m/s) in transmission medium；The time that upstream and downstream sensor receives suction wave is respectively t1, t2
(s).Then have：
It arranges：The i.e. required orientation distances of X.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that；It still may be used
Either which part or all technical characteristic are equal with modifying to the technical solution recorded in previous embodiment
It replaces；And these modifications or replacement, the essence of appropriate technical solution is not made to depart from the model of technical solution of the embodiment of the present invention
It encloses, should all cover among the claim of the present invention and the scope of specification.
Claims (6)
1. a kind of fuel gas pipeline leakage based on sound pressure signal identification detects positioning experiment platform, it is characterised in that：Including simulation
Fuel gas transmission pipe network, simulated leakage device, medium conveying apparatus, sound pressure signal detection device；
The simulation fuel gas transmission pipe network is made of the simulation pipeline networking of three different-diameters, simulation pipeline I and simulation pipeline
II is located at same vertical plane, and simulation pipeline II and simulation pipeline III are located at same level, and three pipelines are in integrally 3% slope
Degree；
The simulated leakage device is to open up leak on simulation duct wall, and proportioning valve and flowmeter are equipped on leak,
Fixed leakage rate is simulated by proportional valve control, is all provided on every simulation pipeline there are two simulated leakage device, along simulation pipeline
Medium transmission direction is followed successively by the first simulated leakage device, the second simulated leakage device；
The medium conveying apparatus include simulation fuel gas transmission pipe network, pressure-regulating valve, the system that can be situated between, simulation entrance valve,
Simulate pipe outlet valve；Every simulation entrance is equipped with simulation entrance valve, and outlet is equipped with simulation pipe outlet valve；
The system output that can be situated between is connected with the pressure-regulating valve arrival end, and the pressure-regulating valve port of export and simulation combustion gas are defeated
Pipe network entrance is sent to be connected, the system that can be situated between to simulation fuel gas transmission pipe network pumped (conveying) medium and controls simulation by pressure-regulating valve
Fuel gas transmission pipe network pressure rating；
The sound pressure signal detection device includes pressure gauge, temperature sensor, pressure sensor, differential pressure pickup, sound wave sensing
Device, Dynamic High-accuracy signal data acquisition card, generic analog signal data collecting card, computer；The every simulation pipeline exists
The upstream end of first simulated leakage device is equipped with pressure gauge, temperature sensor, pressure sensor, pressure successively along medium transmission direction
Gap sensor, sonic sensor set there are two sonic sensor between two simulated leakage devices, are filled in the second simulated leakage
The downstream put is equipped with sonic sensor, differential pressure pickup, pressure sensor, temperature sensing successively along pipeline medium transmission direction
Device, pressure gauge；The output terminal of the sonic sensor is connected with the input terminal of Dynamic High-accuracy signal data acquisition card, high-precision
The output terminal of dynamic signal data capture card is connected with computer, the temperature sensor, pressure sensor and differential pressure pickup
Output terminal is connected with generic analog signal data collecting card input terminal, the generic analog signal data collecting card output terminal and meter
Calculation machine is connected；Data collecting card can gather the signal of sonic sensor, pressure sensor, differential pressure pickup, temperature sensor
And it transmits a signal to computer and is analyzed.
2. the fuel gas pipeline leakage according to claim 1 based on sound pressure signal identification detects positioning experiment platform, special
Sign is：The common port pipeline simulated pipeline II and simulate the entrance of pipeline III is equipped with common port inlet valve, simulates pipeline II
Common port outlet valve is equipped with the common port pipeline of the outlet of simulation pipeline III.
3. the fuel gas pipeline leakage according to claim 1 based on sound pressure signal identification detects positioning experiment platform, special
Sign is：Using blind plate sealing, pipe network outlet lower end is additionally provided with blowdown branch, branch for the simulation fuel gas transmission pipe network outlet
Blowdown valve is equipped with, it can be achieved that purging blowdown to pipeline.
4. the fuel gas pipeline leakage according to claim 1 based on sound pressure signal identification detects positioning experiment platform, special
Sign is：The high-end safety vent valve that is equipped with of simulation fuel gas transmission pipe network is vented for pipe network overpressure protection and medium.
5. the fuel gas pipeline leakage according to claim 1 based on sound pressure signal identification detects positioning experiment platform, special
Sign is：The simulation pipeline I, simulation pipeline II, the size of simulation pipeline III are respectively DN50, DN100, DN150.
6. the fuel gas pipeline leakage according to claim 1 based on sound pressure signal identification detects positioning experiment platform, special
Sign is：It is described can be situated between system include be sequentially connected air compressor machine, check-valves, the first ball valve, the second ball valve, vortex-shedding meter,
3rd ball valve；Drying pipeline is parallel at second ball valve, which includes the 4th ball valve being sequentially connected, drying
Device, the 5th ball valve.
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