CN102537671A - Sensor module for monitoring leakage of natural gas transmission pipeline - Google Patents
Sensor module for monitoring leakage of natural gas transmission pipeline Download PDFInfo
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- CN102537671A CN102537671A CN2012100578760A CN201210057876A CN102537671A CN 102537671 A CN102537671 A CN 102537671A CN 2012100578760 A CN2012100578760 A CN 2012100578760A CN 201210057876 A CN201210057876 A CN 201210057876A CN 102537671 A CN102537671 A CN 102537671A
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- natural gas
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- gas transmission
- leakage
- transmission pipeline
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Abstract
The invention provides a sensor module for monitoring the leakage of a natural gas transmission pipeline, which comprises a cylinder body, wherein the cylinder body is internally provided with a signal amplifier, the lower end of the cylinder body is fixed with a piezoelectric ceramics sensor with fixed induction frequency of 0.1-10Hz by a rotary joint, a signal output line of the piezoelectric ceramics sensor penetrates through the rotary joint to be connected with the signal amplifier, an output signal cable interface is arranged on the wall of the cylinder body, and a signal output end of the signal amplifier extends out of the output signal cable interface to be connected with a data acquisition card of a monitoring extension set. The piezoelectric ceramics sensor can bear high pressure in the natural gas transmission pipeline, and is high in sensitivity for detecting infrasonic waves, thereby being suitable for monitoring the leakage of the natural gas transmission pipeline. Therefore, the sensor of the module can exactly detect the leakage happening at a further distance (the longest distance is 60km), so that the leakage can be monitored only by the means that the sensor is arranged at the head station and the tail station of the natural gas transmission pipeline, and the natural gas transmission pipeline along a way does not need damaging, so that the construction cost and the running cost can be greatly reduced, and the potential safety hazard can be avoided.
Description
Technical field
The present invention relates to a kind of sensor cluster that natural gas pipeline leaks that is used to monitor, can leak the sound wave that is sent, belong to the safety monitoring device field that gas production field or gas pipeline must be installed at induction pipe.
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.
Summary of the invention
Technical problem to be solved by this invention is; Overcome the shortcoming of existing technology; A kind of sensor cluster that natural gas pipeline leaks that is used to monitor is provided; It can detect longer-distance gas pipeline leakage, at the first terminal of natural gas line one cover sensor cluster is installed respectively, cooperates the monitoring process control machine can realize that the leakage on-line monitoring and the leak point of natural gas line accurately locate again.
In order to solve above technical problem; Originally be used to monitor the sensor cluster that natural gas pipeline leaks; It is characterized in that: have a rigid canister; Signal amplifier is installed in the cylindrical shell, and said cylindrical shell lower end is fixed with the piezoceramic transducer that induction frequencies is 0.1Hz～10Hz through conversion adapter, 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, said 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.
The present invention selects for use piezoceramic transducer as sense cell, 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; It is 0.1Hz～10Hz that piezoceramic transducer of the present invention receives audiorange; 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 assembly 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.The present invention is installed on the rear end of piezoceramic transducer with signal amplifier, and its signal transmission distance is short, undamped, compact overall structure, is convenient to install, anti-tampering.
The technological scheme that the present invention further limits is:
This assembly 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 present invention 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 present invention 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 present invention 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 assembly is arranged at the rear of sensor with signal amplifier, and 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.
Among the present invention, 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 signal amplifier with the acoustic pressure signal that receives.
The present invention samples to the infrasonic wave of 0.1Hz in the natural gas line～10Hz frequency and discerns, 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 a structure composition frame chart of the present invention.
Embodiment
The sensor cluster that is used to monitor the natural gas pipeline leakage that present embodiment provides; Structure is as shown in Figure 1; Comprise a rigid canister 3; Signal amplifier 4 is installed in the cylindrical shell 3, and cylindrical shell 3 lower ends are fixed with the piezoceramic transducer 8 that induction frequencies is 0.1Hz～10Hz through conversion adapter 7, 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.In this example, 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 present invention 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 the conversion adapter lower end; The G1/2 of conversion adapter 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.
Except that the foregoing description, the present invention 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 requirement of the present invention.
Claims (4)
1. be used to monitor the sensor cluster that natural gas pipeline leaks; It is characterized in that: have a rigid canister; Signal amplifier is installed in the cylindrical shell; Said cylindrical shell lower end is fixed with the piezoceramic transducer that induction frequencies is 0.1Hz～10Hz through conversion adapter; 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.
2. according to the said sensor cluster that is used to monitor the natural gas pipeline leakage of claim 1, it is characterized in that: said 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.
3. natural gas pipeline leakage monitoring positioning device according to claim 2 is characterized in that: the piezoelectric ceramic wafer of said piezoceramic transducer is processed by zirconium metatitanic acid PZT-P5 material.
4. natural gas pipeline leakage monitoring positioning device according to claim 3 is characterized in that: the piezoelectric constant diaphragm diameter of said piezoceramic transducer is 18mm, and thickness is 0.7mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100578760A CN102537671A (en) | 2012-03-07 | 2012-03-07 | Sensor module for monitoring leakage of natural gas transmission pipeline |
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| CN2012100578760A CN102537671A (en) | 2012-03-07 | 2012-03-07 | Sensor module for monitoring leakage of natural gas transmission pipeline |
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| CN2012100578760A Pending CN102537671A (en) | 2012-03-07 | 2012-03-07 | Sensor module for monitoring leakage of natural gas transmission pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108758360A (en) * | 2018-06-05 | 2018-11-06 | 北京目黑科技有限公司 | A kind of infrasound sensor and electronic equipment |
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| CN1851315A (en) * | 2006-05-29 | 2006-10-25 | 重庆灵鉴检测仪器有限公司 | Pipeline leakage signal sensing device |
| CN101240874A (en) * | 2008-03-05 | 2008-08-13 | 天津大学 | Oil pipeline leakage detection device based on initiative acoustic emission principle and method thereof |
| CN101270853A (en) * | 2008-05-15 | 2008-09-24 | 中国石油大学(北京) | Gas pipeline leakage remote detection device, method and system based on infrasonic wave |
| CN101358689A (en) * | 2008-09-22 | 2009-02-04 | 郑欢 | Pipe detection device |
| CN101832472A (en) * | 2010-06-12 | 2010-09-15 | 中国石油化工股份有限公司管道储运分公司 | System implementing pipeline leak detection by utilizing infrasonic wave |
| CN201723985U (en) * | 2010-03-15 | 2011-01-26 | 北京中联电科技术有限公司 | Infrasonic-wave signal monitoring device of built-in voiceprint recognition algorithm |
| CN202501198U (en) * | 2012-03-07 | 2012-10-24 | 张钧 | Sensor assembly used for monitoring leakage of natural gas transmission pipeline |
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2012
- 2012-03-07 CN CN2012100578760A patent/CN102537671A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851315A (en) * | 2006-05-29 | 2006-10-25 | 重庆灵鉴检测仪器有限公司 | Pipeline leakage signal sensing device |
| CN101240874A (en) * | 2008-03-05 | 2008-08-13 | 天津大学 | Oil pipeline leakage detection device based on initiative acoustic emission principle and method thereof |
| CN101270853A (en) * | 2008-05-15 | 2008-09-24 | 中国石油大学(北京) | Gas pipeline leakage remote detection device, method and system based on infrasonic wave |
| CN101358689A (en) * | 2008-09-22 | 2009-02-04 | 郑欢 | Pipe detection device |
| CN201723985U (en) * | 2010-03-15 | 2011-01-26 | 北京中联电科技术有限公司 | Infrasonic-wave signal monitoring device of built-in voiceprint recognition algorithm |
| CN101832472A (en) * | 2010-06-12 | 2010-09-15 | 中国石油化工股份有限公司管道储运分公司 | System implementing pipeline leak detection by utilizing infrasonic wave |
| CN202501198U (en) * | 2012-03-07 | 2012-10-24 | 张钧 | Sensor assembly used for monitoring leakage of natural gas transmission pipeline |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108758360A (en) * | 2018-06-05 | 2018-11-06 | 北京目黑科技有限公司 | A kind of infrasound sensor and electronic equipment |
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Application publication date: 20120704 |