CN202469500U - Natural gas transmission pipeline leakage monitoring and positioning device - Google Patents
Natural gas transmission pipeline leakage monitoring and positioning device Download PDFInfo
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- CN202469500U CN202469500U CN2012200824474U CN201220082447U CN202469500U CN 202469500 U CN202469500 U CN 202469500U CN 2012200824474 U CN2012200824474 U CN 2012200824474U CN 201220082447 U CN201220082447 U CN 201220082447U CN 202469500 U CN202469500 U CN 202469500U
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Abstract
The utility model relates to a natural gas transmission pipeline leakage monitoring and positioning device, which comprises a monitoring host, monitoring extensions and piezoelectric ceramic sensors, wherein the piezoelectric ceramic sensors are arranged at the two ends of a natural gas pipeline, the monitoring extensions are communicatively connected with the monitoring host, the monitoring extensions are respectively provided with a GPS (global positioning system) antenna, the piezoelectric ceramic sensors are installed on the natural gas pipeline at an initial station and a terminal station, the rear ends of the piezoelectric ceramic sensors are connected with signal amplifiers, the signal output ends of the signal amplifiers are connected with the data acquisition cards of the monitoring extensions, and the audio receiving frequency of the piezoelectric ceramic sensors is 0.1Hz-10Hz. The natural gas transmission pipeline leakage monitoring and positioning device can sample and recognize subsonic waves with frequency being 0.1Hz-10Hz, so as to monitor natural gas leakage on line. According to practices, the leakage judgment correctness rate of the natural gas transmission pipeline leakage monitoring and positioning device reaches above 98 percent. Compared with the existing leakage monitoring device, a great progress is made in not only judgment efficiency, but also feasibility.
Description
Technical field
The utility model relates to a kind of natural gas pipeline that is used for when leakage or stolen gas take place; Ability on-line monitoring pipe leakage and the natural gas pipeline leakage positioning device of judging the leakage particular location belong to the safety monitoring device field that gas production field or gas pipeline must be installed.
Background technique
Natural gas pipeline is in the long-time running process, because of self material defective cracks, trachoma, because of corrosion takes place to rot; Because of outside destroy produces cracking, leak gas because of stealing gas, cause very big loss to economic construction; Cause very big harm to safe operation, cause great destruction to surrounding environment.For a long time, natural gas pipeline is leaked on-Line Monitor Device both at home and abroad and dropped into lot of manpower and material resources research.Some universities and colleges, scientific research institutions adopted such as statistical method, distribution type fiber-optic method, moment modelling, sound wave method, NPW method, mass and size averaging method etc. carried out preliminary discussion.Though research unit is many, method is numerous, and majority only limits to theoretical research or experimental stage.The relevant monitoring device of on-the-spot accidental one or two cover, but no matter be that feasibility, accuracy, actual effect are very little.
Retrieve discovery through the claimant, Chinese patent CN201120135726.8 " city gas leakage alarm ", it selects for use the ethane sensor as rock gas leak detection unit, and the ethane sensor is spaced apart along natural gas line.The detectivity of this leak alarm device is low, disturbed easily, and detectyion range is near; Therefore need be along pipeline enclosure at a distance from distribution sensor; The installation of need on delivering pipe, punching, there is potential safety hazard greatly and easily in engineering work load, especially to being in pipeline under the operation state; This installation transformation is very dangerous, so this scheme fails to be implemented so far.
The model utility content
The utility model technical problem to be solved is; Overcome the shortcoming of existing technology; Natural gas pipeline leakage monitoring positioning device is provided, can guarantees promptly and accurately, monitor effectively the leakage and the accurate positioning device of natural gas pipeline, for the safety gas transmission provides powerful guarantee.
In order to solve above technical problem; The utility model provides natural gas pipeline leakage monitoring positioning device; It is characterized in that: comprise monitoring host computer, monitoring extension set, piezoceramic transducer, said monitoring extension set, piezoceramic transducer are arranged at the initial station and the terminal of natural gas line, and said monitoring extension set is connected with the monitoring host computer communication; The monitoring extension set is equipped with gps antenna; And through accepting the time synchronization between the gps signal realization monitoring extension set, said piezoceramic transducer is installed on the natural gas line of initial station and terminal, and the rear end of piezoceramic transducer is connected with signal amplifier; The signal output part of signal amplifier and the data capture card connection of monitoring extension set, it is 0.1Hz～10Hz that the audio frequency of said piezoceramic transducer is accepted frequency range.
The sensor of leakage detecting and positioning device is selected piezoceramic transducer for use, and it can bear the high pressure in the natural gas line, and highly sensitive to infrasonic detection, is applicable to the natural gas pipeline leakage monitoring; The reception audiorange of this device piezoceramic transducer is 0.1Hz～10Hz; The rock gas leakage produces in the sound frequency; Infrasonic wave in this frequency range has stronger regularity and anti-interference; Add that infrasonic wave has the lower characteristic of decay in the transmittance process, the sensor of this device can accurately be detected occur in the leakage of remote (the longest 60 kilometers).Because sensor can be surveyed and occur in the leakage right than distant location, therefore only need to get final product at the first terminal sensor installation of natural gas line, need not destroy natural gas line on the way, reduce construction cost and operating cost greatly, and do not have potential safety hazard.In this device, signal amplifier is installed on the rear end of piezoceramic transducer, its signal transmission distance is short, undamped, compact overall structure, is convenient to install, anti-tampering.
When gas pipeline point takes place to leak, leak the signal that produces and propagate to initial station and terminal along pipeline.Because the distance of this leakage point distance and terminal apart from the initial station is inequality, it is also inequality that infrasonic wave arrives the time of time and terminal at first stop.In the monitoring extension set of initial station and terminal, be provided with gps system; The time at two stations is in full accord after the GPS time service; Thereby leakage signal to propagation time at two stations be able to confirm; Thereby can confirm that leakage signal arrives the time difference at two stations, can accurately locate leakage point in conjunction with the velocity of propagation of sound wave in pipeline.
The technological scheme that the utility model further limits is:
Piezoceramic transducer is installed on the valve on the natural gas pipeline.Can not destroy original pipeline like this, the equipment of being convenient to is installed and later maintenance.
Because the acoustic signal that the leakage of natural gas pipeline produces is extremely faint, sensor can only be installed in the pressurizing point (first terminal) at gas pipeline two ends in addition, and the decay when the length propagation of leakage acoustic signal is very fast, and leakage signal is pounced on and caught very difficulty.
For solving above technical problem; The utility model is according to the temperature of the working environment of required sensor; Humidity; PH value, pressure, the CF center frequency in the taking into account system, acoustic pressure, circuit parameter, size, thickness, machining accuracy and surface roughness are chosen the wafer that zirconium metatitanic acid PZT-P5 (acceptance type) material is made piezoelectric constant in the material in potassium dihydrogenphosphate, barium titanate, zirconium metatitanic acid PZT-P5, niobate, magnoniobate salt, P-51 and lead zirconate titanate etc. 7; Improve piezoelectric crystal, strengthened sensitivity.
In addition; The utility model increases to 18mm (domestic initiation) with the diameter of piezoelectric constant diaphragm by 12.7mm; Area has increased by one times, has improved sensitivity, signal to noise ratio and the low-frequency range of infrasonic sensor greatly, can collect the infrasonic wave low frequency signal that long Distance Transmission is come.
And the utility model reduces the thickness of piezoelectric constant diaphragm to 0.7mm, has increased the flexibility of diaphragm, and is sensitiveer to the impression of acoustic pressure.
Generally be installed in on-the-spot sensor after capturing the infrasonic wave signal, need long distance that this signal is transferred in the signal amplifier charge signal passed and amplify again after changing electric current into.The defective of this kind practice is, because the coherent signal that long Distance Transmission collects, energy consumption, signal weakening are until disappearance in the transmission way for this signal, and signal amplifier causes difficulty to this signal conversion, when amplifying.
For this reason; This device is arranged at signal amplifier at the rear of sensor; Concrete structure is following: this device also has a rigid canister; Said signal amplifier is installed in the cylindrical shell, and fixedly piezoceramic transducer of conversion adapter is passed through in said cylindrical shell lower end, and the output line of piezoceramic transducer links to each other with signal amplifier after passing conversion adapter; Offer the output signal cable interface on the barrel of said cylindrical shell, the signal output part of signal amplifier stretches out back and the data capture card connection of monitoring extension set from this output signal cable interface.
Further, cylindrical shell has loam cake, lower cover, and said lower cover is threaded with conversion adapter, and said piezoceramic transducer is welded on the lower end of conversion adapter.
During installation, the circuit board of signal amplifier is placed on the inside of rigid canister, the loam cake that closes becomes an O-ring cylinder with lower cover.This rigid canister is screwed in the conversion adapter upper end; In the valve tapped hole that the lower end precession natural gas line of conversion adapter is reserved; Can bear the high pressure of maximum 10Mpa in the pipe, pounce on the infrasonic wave signal of grasping in the leakage signal effectively, and the acoustic pressure signal that just receives is input to preamplifier.
In the utility model, piezoceramic transducer and signal amplifier just assemble an one-piece element.This overall structure good seal performance, be convenient to install, anti-tampering outside, can reach IP65 for whole assembly parts security level, through the explosion-proof authentication of Ex dII A T3 Gb.When this assembly parts need be installed in open-air wilderness, can lightning protection and ground connection be set at the circuit board and the shell of assembly parts, can avoid thunderbolt.And in the valve tapped hole that the lower end precession natural gas line of reducer union is reserved, sensor is input to preamplifier with the acoustic pressure signal that receives.
The utility model can be sampled and discerns the infrasonic wave of 0.1Hz in the natural gas line～10Hz frequency, in order to natural gas leaking is carried out on-line monitoring.The research staff has carried out repetition test, constantly sums up and concludes, and has paid hard work; When finding gas pipeline leakage, the infrasonic wave of 0.1Hz～10Hz frequency has strong regular and stable, thereby utilizes this rule to research and develop this covering device; And set up the leakage model of cognition natural gas leaking is judged; Facts have proved that its correct judgment rate can reach more than 98%, compare, no matter from identification efficiency or feasibility has all had significant progress with existing leakage monitor.After estimating to release,, have good market prospects with the popular welcome that receives energy-conservation user.
Description of drawings
Fig. 1 is the structure composition frame chart of the utility model.
Fig. 2 is the composite structure schematic representation of the utility model piezoceramic transducer and signal amplifier.
Embodiment
The natural gas pipeline leakage monitoring positioning device that present embodiment provides; Structure is as shown in Figure 1; Comprise monitoring host computer, monitoring extension set, piezoceramic transducer, monitoring extension set, piezoceramic transducer are arranged at the initial station and the terminal of natural gas line, and said monitoring extension set is connected with the monitoring host computer communication; The monitoring extension set is equipped with gps antenna; And through accepting the time synchronization between the gps signal realization monitoring extension set, said piezoceramic transducer is installed on the natural gas line of initial station and terminal, and the rear end of piezoceramic transducer is connected with signal amplifier; The signal output part of signal amplifier and the data capture card connection of monitoring extension set, it is 0.1Hz～10Hz that the audio frequency of said piezoceramic transducer is accepted frequency.In this example, piezoceramic transducer is installed on the valve on the natural gas pipeline.
As shown in Figure 2; This device has a rigid canister 3; Signal amplifier 4 is installed in the cylindrical shell 3, and fixedly piezoceramic transducer 8 of conversion adapter 7 is passed through in cylindrical shell 3 lower ends, and the output line of piezoceramic transducer 8 passes conversion adapter 7 backs and links to each other with signal amplifier 4; Offer output signal cable interface 2 on the barrel of cylindrical shell 3, the signal output part of signal amplifier 4 stretches out back and the data capture card connection of monitoring extension set from this output signal cable interface 2.As shown in Figure 2, cylindrical shell 3 has loam cake 1, lower cover 6, and lower cover 6 is threaded with conversion adapter 7, and piezoceramic transducer 8 is welded on the lower end of conversion adapter 7.
The utility model is according to the temperature of the working environment of required sensor; Humidity; PH value, pressure, the CF center frequency in the taking into account system, acoustic pressure, circuit parameter, size, thickness, machining accuracy and surface roughness are chosen the wafer that zirconium metatitanic acid PZT-P5 (acceptance type) material is made piezoelectric constant in the material in potassium dihydrogenphosphate, barium titanate, zirconium metatitanic acid PZT-P5, niobate, magnoniobate salt, P-51 and lead zirconate titanate etc. 7; Improve piezoelectric crystal, strengthened sensitivity.
In the present embodiment; The diameter of piezoelectric constant diaphragm is increased to 18mm (domestic initiation) by 12.7mm; Area has increased by one times, has improved the scope of sensitivity, signal to noise ratio and the low frequency of infrasonic sensor greatly, can collect the infrasonic wave low frequency signal that long Distance Transmission is come.The thickness of piezoelectric constant diaphragm reduces to 0.7mm, has increased the flexibility of diaphragm, and is sensitiveer to the impression of acoustic pressure.This piezoelectric infrasonic wave sensor is welded on a reducer union lower end; The G1/2 of reducer union lower end is threaded on the valve on the natural gas pipeline; This sensor extend in the natural gas pipeline; Can bear the high pressure of maximum 10Mpa in the pipe, pounce on the infrasonic wave signal of grasping in the leakage signal effectively.
When gas pipeline point takes place to leak, leak the signal that produces and propagate to initial station and terminal along pipeline.Because this leakage point is distance L apart from the initial station
1Distance L with terminal
2Inequality, infrasonic wave arrives initial station time t
1Time t with terminal
2Also inequality.In the initial station and the monitoring extension set of terminal, be provided with gps system, the time at two stations is in full accord after the GPS time service, thereby leakage signal is able to confirm to the propagation time at two stations t1 and t2, thereby can confirm that leakage signal arrives the time difference Δ t at two stations.In conjunction with the speed that sound wave is propagated, can try to achieve the position, leak point in pipeline.
Except that the foregoing description, the utility model can also have other mode of executions.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.
Claims (6)
1. natural gas pipeline leakage monitoring positioning device; It is characterized in that: comprise monitoring host computer, monitoring extension set, piezoceramic transducer; Said monitoring extension set, piezoceramic transducer are arranged at the initial station and the terminal of natural gas line; Said monitoring extension set is connected with the monitoring host computer communication, and the monitoring extension set is equipped with gps antenna, and realizes the time synchronization between the monitoring extension set through accepting gps signal; Said piezoceramic transducer is installed on the natural gas line of initial station and terminal; The rear end of piezoceramic transducer is connected with signal amplifier, the signal output part of signal amplifier and the data capture card connection of monitoring extension set, and it is 0.1Hz～10Hz that the audio frequency of said piezoceramic transducer is accepted frequency.
2. natural gas pipeline leakage monitoring positioning device according to claim 1, it is characterized in that: piezoceramic transducer is installed on the valve on the natural gas pipeline.
3. natural gas pipeline leakage monitoring positioning device according to claim 1; It is characterized in that: also have a rigid canister; Said signal amplifier is installed in the cylindrical shell; Fixedly piezoceramic transducer of conversion adapter is passed through in said cylindrical shell lower end; The output line of piezoceramic transducer links to each other with signal amplifier after passing conversion adapter, offers the output signal cable interface on the barrel of said cylindrical shell, and the signal output part of signal amplifier stretches out back and the data capture card connection of monitoring extension set from this output signal cable interface.
4. natural gas pipeline leakage monitoring positioning device according to claim 3, it is characterized in that: cylindrical shell has loam cake, lower cover, and said lower cover is threaded with conversion adapter, and said piezoceramic transducer is welded on the lower end of conversion adapter.
5. natural gas pipeline leakage monitoring positioning device according to claim 4 is characterized in that: the piezoelectric ceramic wafer of said piezoceramic transducer is processed by zirconium metatitanic acid PZT-P5 material.
6. natural gas pipeline leakage monitoring positioning device according to claim 5 is characterized in that: the piezoelectric constant diaphragm diameter of said piezoceramic transducer is 18mm, and thickness is 0.7mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200824474U CN202469500U (en) | 2012-03-07 | 2012-03-07 | Natural gas transmission pipeline leakage monitoring and positioning device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200824474U CN202469500U (en) | 2012-03-07 | 2012-03-07 | Natural gas transmission pipeline leakage monitoring and positioning device |
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| CN202469500U true CN202469500U (en) | 2012-10-03 |
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| CN2012200824474U Expired - Fee Related CN202469500U (en) | 2012-03-07 | 2012-03-07 | Natural gas transmission pipeline leakage monitoring and positioning device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062628A (en) * | 2012-11-02 | 2013-04-24 | 常州大学 | Urban gas buried pipeline leakage detection and locating method and applications thereof |
| CN103629536A (en) * | 2013-11-13 | 2014-03-12 | 常州大学 | Device and method for monitoring natural gas pipeline leakage |
| CN104141883A (en) * | 2013-12-10 | 2014-11-12 | 唐山学院 | Control method and device for sulfuric acid leakage monitoring |
| CN105674065A (en) * | 2016-01-18 | 2016-06-15 | 南京信息职业技术学院 | Acoustic emission pipeline leakage point positioning method based on variable mode decomposition |
| CN105864643A (en) * | 2016-03-24 | 2016-08-17 | 华北电力大学 | Gas pipeline leakage positioning experimental device and method based on RBF neural network |
| CN108869894A (en) * | 2018-09-30 | 2018-11-23 | 康泰塑胶科技集团有限公司 | A kind of intelligent gas pipeline |
| CN109668055A (en) * | 2018-11-16 | 2019-04-23 | 江苏微优软件科技有限公司 | A kind of remote online valve leaks monitoring device and its working method |
| CN111536430A (en) * | 2020-05-09 | 2020-08-14 | 深圳市行健自动化股份有限公司 | Method for three-dimensionally positioning pipeline leakage monitoring based on temperature and humidity |
-
2012
- 2012-03-07 CN CN2012200824474U patent/CN202469500U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062628A (en) * | 2012-11-02 | 2013-04-24 | 常州大学 | Urban gas buried pipeline leakage detection and locating method and applications thereof |
| CN103629536A (en) * | 2013-11-13 | 2014-03-12 | 常州大学 | Device and method for monitoring natural gas pipeline leakage |
| CN103629536B (en) * | 2013-11-13 | 2015-10-28 | 常州大学 | A kind of device and method of natural gas line leakage |
| CN104141883A (en) * | 2013-12-10 | 2014-11-12 | 唐山学院 | Control method and device for sulfuric acid leakage monitoring |
| CN104141883B (en) * | 2013-12-10 | 2017-02-15 | 唐山学院 | Control method and device for sulfuric acid leakage monitoring |
| CN105674065A (en) * | 2016-01-18 | 2016-06-15 | 南京信息职业技术学院 | Acoustic emission pipeline leakage point positioning method based on variable mode decomposition |
| CN105864643A (en) * | 2016-03-24 | 2016-08-17 | 华北电力大学 | Gas pipeline leakage positioning experimental device and method based on RBF neural network |
| CN108869894A (en) * | 2018-09-30 | 2018-11-23 | 康泰塑胶科技集团有限公司 | A kind of intelligent gas pipeline |
| CN108869894B (en) * | 2018-09-30 | 2020-01-03 | 康泰塑胶科技集团有限公司 | Intelligent gas pipeline |
| CN109668055A (en) * | 2018-11-16 | 2019-04-23 | 江苏微优软件科技有限公司 | A kind of remote online valve leaks monitoring device and its working method |
| CN111536430A (en) * | 2020-05-09 | 2020-08-14 | 深圳市行健自动化股份有限公司 | Method for three-dimensionally positioning pipeline leakage monitoring based on temperature and humidity |
| CN111536430B (en) * | 2020-05-09 | 2022-02-18 | 深圳市行健自动化股份有限公司 | Method for three-dimensionally positioning pipeline leakage monitoring based on humidity |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20160307 |
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| CF01 | Termination of patent right due to non-payment of annual fee |