CN202252868U - Leakage point positioning system of leakage monitoring system of fiber optical sensing natural gas pipeline - Google Patents
Leakage point positioning system of leakage monitoring system of fiber optical sensing natural gas pipeline Download PDFInfo
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- CN202252868U CN202252868U CN201120344874.0U CN201120344874U CN202252868U CN 202252868 U CN202252868 U CN 202252868U CN 201120344874 U CN201120344874 U CN 201120344874U CN 202252868 U CN202252868 U CN 202252868U
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Abstract
The utility model relates to a leakage point positioning system of a leakage monitoring system of a fiber optical sensing natural gas pipeline. The leakage point positioning system of the leakage monitoring system of the fiber optical sensing natural gas pipeline comprises a light source, a transmission light path part, optical fiber sensors, a photoelectric detector and a signal collecting and processing module, wherein the optical fiber sensors are mounted on a pipeline body at regular intervals; the plurality of optical fiber sensors form an optical fiber sensor set; each sensor is connected with the light source and the photoelectric detector by the transmission light path; an output of the photoelectric detector is sequentially connected with a signal conditioning unit, a signal collecting unit and a processing unit in the signal collecting and processing module in series; an output of the processing unit is provided with a display terminal and an external interface; and an output of the signal collecting and processing module is connected with a microcomputer by the external interface. By adopting the leakage point positioning system of the leakage monitoring system of the fiber optical sensing natural gas pipeline, a burst signal or a transmitted leakage signal can be monitored; and moreover, the leakage point positioning system of the leakage monitoring system of the fiber optical sensing natural gas pipeline has the advantages of good positioning accuracy, stable property, etc.
Description
Technical field
The utility model is a kind of leakage point navigation system that is used for the Fibre Optical Sensor natural gas line leakage system of accurate locating leaks in pipes point position, relates to the measurement of mechanical vibration, the measurement and the pipe-line system technical field of impact.
Background technique
At present, the pipeline length overall of building up in the world reaches 2,500,000 kilometers, and having surpassed the railway total kilometrage becomes the main means of transportation of world energy sources, and the oil product of developed country and oil-producing area, the Middle East transports all realizes channelization.China's pipeline has also obtained very fast development in recent years; Length overall is also above 70,000 kilometers; Begun to take shape across thing, stretch from the north to the south, cover the whole nation, be communicated with the overseas big general layout of energy pipe network, pipeline transport becomes the main mode of the allotment conveying of the strategic energy such as oil gas.
Pipeline is because cross-regional wide, receives natural disaster, the third party reasons such as destructions of constructing, and caused more pipe leakage accident generation.External pipe safety situation also allows of no optimist very much, and the natural gas line big bang takes place in U.S. San Bruno city on September 9th, 2010, and blast causes long 51 meters, wide 9 a meters hollow place on the road surface.The pipeline of about 8 meters of one segment length, 76 centimetres of diameters is flown out about 30 meters far away, and causes large-range fire disaster by fried Heaven, causes 4 people dead, and 3 people are missing, and at least 52 people are injured, 4 hectares of burnt areas, and tens of houses are burnt.People's safety, environmental consciousness significantly promote in recent years, also obtain increasing attention as the pipeline transportation safety problem of high risk industries.
Have only the sound wave monitoring method comparatively effective for natural gas line leakage in the mature technique at present; But in order to improve to the real-time of leakage monitoring and the accuracy of leak source location; The layout density that must on pipeline, add large sensor; Increase corresponding power supply, communications equipment simultaneously, cause system cost and installation and maintenance costly.
Along with the development of sensory technique has been carried out the research of SCADA leakage monitoring system like companies such as U.S. CSI, ATMOSI, European TER abroad; Sensornet company has also developed the leakage monitoring system based on distributed optical fiber temperature sensor, and portioned product has also been applied for patent protection at home; Units such as domestic University Of Tianjin, Tsing-Hua University, China Renmin People's Liberation Army Office Support Engineering Academy also further investigate the leakage monitoring method of pipeline.
Patent CN200410020046.6 discloses a kind of distribution type fiber-optic method for monitoring leak from oil gas pipe and monitoring device based on principle of interference.This monitoring system requires near pipeline, to lay an optical cable side by side along pipeline, utilizes the optical fiber in the optical cable to form an optical fiber vibrative sensor.Patent CN200620119429, CN200610113044.0 are the pipeline leakage monitor based on the Sagnac fibre optic interferometer, and patent CN200610072879.6 is a kind of pipeline leakage monitor and method based on distributed optical fiber acoustic sensing technology.
" sensor and micro-system " the 26th the 7th phase of volume " based on the gas pipeline leakage detection method of distributed fiberoptic sensor " discloses a kind of gas pipeline leak detecting device and method based on distributed fiberoptic sensor; It is optical fiber transducer to be installed having on the pipeline body of certain intervals; The vibration wave signal that continuous real-time monitoring is propagated along pipeline body; Vibration wave signal to gathering carries out analysing and processing; Comprise type identification and vibration source location; Wherein type identification is for through whether it belongs to leak type to vibration wave Feature Extraction analysis and distinguishing, and the velocity of propagation of time lag combining vibration ripple on pipeline body that propagates into adjacent several optical fiber transducers according to vibration wave simultaneously confirmed the position at vibration wave source place, and the light intensity signal of sensor output is realized position definite of leakage point after photoelectric conversion.
CN1837674A discloses a kind of pipeline leakage testing device and method based on distributed optical fiber acoustic sensing technology.
US2006/0225507A1 discloses a kind of pipeline leakage testing device and method based on distributed fiberoptic sensor.
Above-mentioned technology all belongs to the distributed optical fiber sensing monitoring method.But such technical monitoring receives the influence of the interference incident that is taken place around the pipeline when leaking, have very high system's false alarm rate, and antijamming capability is relatively poor.
The model utility content
The purpose of the utility model be the design a kind of high sensitivity based on Fibre Optical Sensor quasi-distributed highly sensitive, false alarm rate is low, the leakage point navigation system of the Fibre Optical Sensor natural gas line leakage system of accurate positioning.
Low in view of the sensitivity that above-mentioned several types of Leak testtion, monitoring technology exist, false alarm rate is high, be subject to problem such as such environmental effects; The utility model provides quasi-distributed incident of leakage monitoring and positioning method of a kind of high sensitivity based on Fibre Optical Sensor and system; Adopting high sensor to make can in time be monitored during the primary stage in that leakages such as little leakage, seepage take place when pipeline; And the time lag that combines the incident of leakage signal to propagate into adjacent several sensors accurately calculates the position that incident of leakage takes place; This technological scheme has overcome poor accuracy and the complicated deficiency of mounting process in the monitoring technology before this, accurate positioning.
Optical fiber in the common communications optical cable of utilization and oil and gas pipes laying in one ditch is as emission and passback optical fiber; The pipe leakage optical fiber transducer is connected between emission and the passback optical fiber with technology is parallel with one another through recovery; Form light circuit; The pipe leakage optical fiber transducer is laid on the pipeline, and formation can be monitored the optical fiber sensing system of pipe leakage vibrations.Utilize light source to each pipe leakage optical fiber transducer scanning; Photoelectric conversion signal demodulation, the extraction of distribution situation according to the pipe leakage optical fiber transducer to gathering; The vibration information of realizing each pipe leakage optical fiber transducer obtains; Check and analysis pipe leakage optical fiber transducer signal has judged whether that the pipe leakage incident takes place, and the delay inequality that detects signal according to adjacent pipe leakage optical fiber transducer realizes the location to leakage point.
The system of the utility model constitutes and sees Fig. 1 and Fig. 2, and it includes light source, delivery optics part, optical fiber transducer, photodetector, signals collecting and puocessing module; An optical fiber transducer is installed on pipeline body at a certain distance; A plurality of optical fiber transducers constitute an optical fiber transducer group; Each sensor is connected to light source and photodetector through delivery optics, and photodetector output is connected in series signal condition unit, signal gathering unit and the processing unit in signals collecting and the puocessing module successively; Processing unit output has video terminal and external interface; Signals collecting and puocessing module output connect microcomputer through external interface;
The signal of collecting unit collection is carried out demultiplexing to processing unit and demodulation obtains original vibration wave signal, in recognition circuit and positioning circuit, carries out the identification of leakage signal and the location of leakage point then respectively.
An optical fiber transducer is installed on pipeline body at a certain distance, and each optical fiber transducer is connected with delivery optics through the light path ABAP Adapter, and delivery optics connects light source and photodetector; Photodetector output connects signals collecting and the puocessing module that comprises leakage signal identification and incident locating function, and signals collecting and puocessing module output connect microcomputer.Through the processing of signals collecting and puocessing module, realized the demultiplexing and the demodulation of each sensor signal obtaining original leakage vibration wave signal based on the sensor of frequency division multiplexing mode.
Said sensor adopts the fibre optic interferometer structure, can be the form of optical fiber Michelson interferometer or optical fiber mach Zehnder interferometer;
The formation of said signals collecting and puocessing module is seen Fig. 3, and it comprises signal condition unit, signal gathering unit, processing unit, video terminal and external interface, and processing unit comprises recognition circuit and positioning circuit; The signal of photodetector output is connected in series signal condition unit, signal gathering unit and processing unit successively; The signal of collecting unit collection is carried out demultiplexing to processing unit and demodulation obtains original vibration wave signal, in recognition circuit and positioning circuit, carry out respectively then leakage signal identification and the location of leakage point; Processing unit output has video terminal and external interface;
It is as shown in Figure 4 wherein to nurse one's health element circuit, and it mainly is made up of operational amplifier U14, photoelectric diode U15; 1,5,8 ends of U15 are unsettled, 3,4 end ground connection, and 2 ends connect 6 ends after resistance R 39, capacitor C 60 the two parallel connection, and 6 ends connect 3 ends of U14,8 ends of 7 termination U14 through resistance R 43; The 4 end ground connection of U14,5 ends are unsettled, and 6,7 ends meet AD_VINI altogether, and 1 termination AD_OUT mouth, 2 ends be through resistance R 42 ground connection, the two parallel connection of connecting resistance R40 between 1,2 ends, capacitor C 59;
Recognition circuit in the processing unit is as shown in Figure 5, and it mainly is made up of DSP digital signal processor U1B and peripheral circuit, and the NC1-NC15 pin of U1B is unsettled; AVDD, AGND are analog power input, and AVDD connects the 1.3V power supply through magnetic bead FER1, and parallel connection 3 capacitor C 22, C23, C24 filtering of decoupling between AVDD and AGND; DAI1, DAI3, DAI4 are connected the transmission that is used for data with DR0PRI, RSCLK0, the RFS0 of positioning circuit DSP digital signal processor U10 respectively; DAI9-DAI0 is an expansion interface; DPI9, DPI10 connect external interface circuit;
Positioning circuit in the processing unit is as shown in Figure 6; It mainly is made up of DSP digital signal processor U10 and peripheral circuit and interface; The DR0PRI of U10, RSCLK0, RFS0 are connected with DAI1, DAI3, the DAI4 of recognition circuit DSP digital signal processor U1B respectively and are used to receive data; RX, TX, MOSI, MISO, SCK connect the video terminal interface, and TCK, TDO, TDI, TMS, TRST#, EMU# are debugging interface.
The utility model is with the optical fiber transducer that need not the to supply power pick device as leakage signal; Utilize the optical fiber and the recovery of laying with ditch to use technology to realize the signal remote transmission of optical fiber transducer with pipeline; Solved the difficult problem of electric transducer power supply and telecommunication; Laying optical fiber sensor comparatively thick and fast, multisensor are united and are carried out time delay and estimate to improve the Location accuracy to leakage point; The sensitivity of optical fiber transducer is the several times of traditional sonic transducer in addition, can significantly improve the degree of accuracy that the natural gas line minute leakage is detected and locatees.
Description of drawings
Fig. 1 Fibre Optical Sensor natural gas line leakage system and device schematic diagram
Fig. 2 Fibre Optical Sensor gas pipeline leakage positioning principle figure
Fig. 3 signals collecting and puocessing module theory diagram
Signal condition element circuit figure in Fig. 4 signals collecting and the puocessing module
Signal processing unit recognition circuit figure in Fig. 5 signals collecting and the puocessing module
Signal processing unit positioning circuit figure in Fig. 6 signals collecting and the puocessing module
Embodiment
In conjunction with accompanying drawing and embodiment the utility model is further specified, but should not limit the protection domain of the utility model with this.
Embodiment. this routine formation is as shown in Figure 1, is an optical fiber transducer is installed on pipeline body at a certain distance, and each optical fiber transducer is connected with delivery optics through the light path ABAP Adapter, and delivery optics connects light source and photodetector; Photodetector output connects signals collecting and the puocessing module that comprises leakage signal identification and incident locating function, and signals collecting and puocessing module output connect microcomputer through external interface.Through the processing of signals collecting and puocessing module, realized the demultiplexing and the demodulation of each sensor signal obtaining original leakage vibration wave signal based on the sensor of frequency division multiplexing mode.
Said sensor adopts the fibre optic interferometer structure, can be the form of optical fiber Michelson interferometer or optical fiber mach Zehnder interferometer;
The formation of said signals collecting and puocessing module is seen Fig. 3, and it comprises that signal condition unit, signal gathering unit, processing unit, terminal show and external interface that processing unit comprises recognition circuit and positioning circuit; The signal of photodetector output is connected in series signal condition unit, signal gathering unit and processing unit successively; The signal of collecting unit collection is carried out demultiplexing to processing unit and demodulation obtains original vibration wave signal, in recognition circuit and positioning circuit, carry out respectively then leakage signal identification and the location of leakage point; Processing unit output has video terminal and external interface;
It is as shown in Figure 4 wherein to nurse one's health element circuit, and it mainly is made up of operational amplifier U14, photoelectric diode U15; 1,5,8 ends of U15 are unsettled, 3,4 end ground connection, and 2 ends connect 6 ends after resistance R 39, capacitor C 60 the two parallel connection, and 6 ends connect 3 ends of U14,8 ends of 7 termination U14 through resistance R 43; The 4 end ground connection of U14,5 ends are unsettled, and 6,7 ends meet AD_VINI altogether, and 1 termination AD_OUT mouth, 2 ends be through resistance R 42 ground connection, the two parallel connection of connecting resistance R40 between 1,2 ends, capacitor C 59.
Recognition circuit in the processing unit is as shown in Figure 5, and it mainly is made up of DSP digital signal processor U1B and peripheral circuit, and the NC1-NC15 pin of U1B is unsettled; AVDD, AGND are analog power input, and AVDD connects the 1.3V power supply through magnetic bead FER1, and parallel connection 3 capacitor C 22, C23, C24 filtering of decoupling between AVDD and AGND; DAI1, DAI3, DAI4 are connected the transmission that is used for data with DR0PRI, RSCLK0, the RFS0 of positioning circuit DSP digital signal processor U10 respectively; DAI9-DAI20 is an expansion interface; DPI9, DPI10 connect external interface circuit;
Positioning circuit in the processing unit is as shown in Figure 6; It mainly is made up of DSP digital signal processor U10 and peripheral circuit and interface; The DR0PRI of U10, RSCLK0, RFS0 are connected with DAI1, DAI3, the DAI4 of recognition circuit DSP digital signal processor U1B respectively and are used to receive data; RX, TX, MOSI, MISO, SCK connect the video terminal interface, and TCK, TDO, TDI, TMS, TRST#, EMU# are debugging interface.
Components and parts model and numerical value in conditioning unit, recognition circuit, the positioning circuit are seen Fig. 4-6.
Light source adopts the 100kHZ narrow cable and wide optical fiber laser; Laser output connects delivery optics; Each sensor is connected with delivery optics through the beam splitting apparatus that closes in the light path ABAP Adapter on the pipeline; The beam splitting apparatus splitting ratio that closes of distal-most end is 1: 1; Other close the beam splitting apparatus splitting ratio draw near be followed successively by 2: 1,3: 1,4: 1 ..., 9: 1, wherein respectively close the beam splitting apparatus ratio and be output/input of 1 and be connected with sensor, the output/input end that closes another ratio of beam splitting apparatus is connected through the beam splitting apparatus that closes of delivery optics with the back; Sensor adopts the Mach-Zehnder interferometer structure, arm length difference be respectively 5m, 10m, 15m ..., 50m, long arm of each sensor is wound on the elastomer of rubber material, elastomer is close to tube wall and is fixed;
Along a plurality of sensors are set on the duct orientation; When the pipeline between sensor n and the sensor n+1 takes place to leak; Leaking the vibration wave that causes is picked up by sensor n-1, n, n+1 and n+2 respectively through the regular hour along pipe transmmision; Detection is leaked the delay inequality of oscillating signal according to the sensor of leakage point both sides; Promptly obtain four delay inequalities, and then calculate 4 leak position measured value X through signal analysis to sensor n-1 and n+1, n and n+1, n and n+2, n-1 and four pairs of sensors of n+2
1, X
2, X
3, X
4, these 4 measured values are got assembly average can obtain leakage point position X accurately.
This example is through test of many times; Through being installed on tube wall, can realize by leakage vibration sensing interferometric sensor monitoring along the pipe natural gas leakage; Through realizing the incident of leakage warning to signal analysis and processing and providing the leakage point position; System sensitivity is high, shakes system's false alarm rate that interference causes along the line through the intelligent recognition of leaking having been reduced largely pipeline.
Claims (5)
1. the leakage point navigation system of a Fibre Optical Sensor natural gas line leakage system is characterized in that it includes light source, delivery optics part, optical fiber transducer, photodetector, signals collecting and puocessing module; An optical fiber transducer is installed on pipeline body at a certain distance; A plurality of optical fiber transducers constitute an optical fiber transducer group; Each sensor is connected to light source and photodetector through delivery optics, and photodetector output is connected in series signal condition unit, signal gathering unit and the processing unit in signals collecting and the puocessing module successively; Processing unit output has video terminal and external interface; Signals collecting and puocessing module output connect microcomputer through external interface;
The signal of collecting unit collection is carried out demultiplexing to processing unit and demodulation obtains original vibration wave signal, in recognition circuit and positioning circuit, carries out the identification of leakage signal and the location of leakage point then respectively.
2. the leakage point navigation system of a kind of Fibre Optical Sensor natural gas line leakage according to claim 1 system is characterized in that said signals collecting and puocessing module comprise that signal condition unit, signal gathering unit, processing unit, terminal show and external interface; The signal condition unit output that connects photodetector output is connected in series signal gathering unit and processing unit successively, and processing unit output has the terminal to show and external interface; Said processing unit comprises leakage signal recognition circuit and positioning circuit.
3. the leakage point navigation system of a kind of Fibre Optical Sensor natural gas line leakage according to claim 2 system is characterized in that said conditioning unit mainly is made up of operational amplifier U14, photoelectric diode U15; 1,5,8 ends of U15 are unsettled, 3,4 end ground connection, and 2 ends connect 6 ends after resistance R 39, capacitor C 60 the two parallel connection, and 6 ends connect 3 ends of U14,8 ends of 7 termination U14 through resistance R 43; The 4 end ground connection of U14,5 ends are unsettled, and 6,7 ends meet AD_VINI altogether, and 1 termination AD_OUT mouth, 2 ends be through resistance R 42 ground connection, the two parallel connection of connecting resistance R40 between 1,2 ends, capacitor C 59.
4. the leakage point navigation system of a kind of Fibre Optical Sensor natural gas line leakage according to claim 2 system; It is characterized in that the leakage signal recognition circuit in the said processing unit mainly is made up of DSP digital signal processor U1B and peripheral circuit, the NC1-NC15 pin of U1B is unsettled; AVDD, AGND are analog power input, and AVDD connects the 1.3V power supply through magnetic bead FER1, and parallel connection 3 capacitor C 22, C23, C24 filtering of decoupling between AVDD and AGND; DAI1, DAI3, DAI4 are connected the transmission that is used for data with DR0PRI, RSCLK0, the RFS0 of positioning circuit DSP digital signal processor U10 respectively; DAI9-DAI20 is an expansion interface; DPI 9, DPI10 connect external interface circuit.
5. the leakage point navigation system of a kind of Fibre Optical Sensor natural gas line leakage according to claim 2 system; It is characterized in that the positioning circuit in the said processing unit mainly is made up of DSP digital signal processor U10 and peripheral circuit and interface; The DR0PRI of U10, RSCLK0, RFS0 are connected with DAI1, DAI 3, the DAI 4 of recognition circuit DSP digital signal processor U1B respectively and are used to receive data; RX, TX, MOSI, MISO, SCK connect the video terminal interface, and TCK, TDO, TDI, TMS, TRST#, EMU# are debugging interface.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720949A (en) * | 2012-06-11 | 2012-10-10 | 天津大学 | Fiber duct leakage monitoring device and control method thereof |
| CN102997060A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Leakage point locating system of optical fiber sensing natural gas pipeline leakage monitoring system |
| CN104896311A (en) * | 2015-05-08 | 2015-09-09 | 淄博华润燃气有限公司 | Leakage detecting device for buried gas pipeline and distributing and leakage-detecting method for leakage detecting device |
-
2011
- 2011-09-14 CN CN201120344874.0U patent/CN202252868U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997060A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Leakage point locating system of optical fiber sensing natural gas pipeline leakage monitoring system |
| CN102720949A (en) * | 2012-06-11 | 2012-10-10 | 天津大学 | Fiber duct leakage monitoring device and control method thereof |
| CN104896311A (en) * | 2015-05-08 | 2015-09-09 | 淄博华润燃气有限公司 | Leakage detecting device for buried gas pipeline and distributing and leakage-detecting method for leakage detecting device |
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Effective date of registration: 20170322 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: China National Petroleum Corporation Patentee after: China Petroleum Pipeline Bureau Engineering Co., Ltd. Address before: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee before: China National Petroleum Corporation Patentee before: China Petroleum and Natural Gas Pipeline Bureau |
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