CN103185198A - Distributed optical fiber leakage monitoring system of LNG storage tank - Google Patents
Distributed optical fiber leakage monitoring system of LNG storage tank Download PDFInfo
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- CN103185198A CN103185198A CN2011104554629A CN201110455462A CN103185198A CN 103185198 A CN103185198 A CN 103185198A CN 2011104554629 A CN2011104554629 A CN 2011104554629A CN 201110455462 A CN201110455462 A CN 201110455462A CN 103185198 A CN103185198 A CN 103185198A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 51
- 239000013307 optical fiber Substances 0.000 title claims abstract description 50
- 238000009413 insulation Methods 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000003949 liquefied natural gas Substances 0.000 description 40
- 239000007789 gas Substances 0.000 description 4
- 238000001069 Raman spectroscopy Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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Abstract
The invention discloses a distributed optical fiber leakage monitoring system of an LNG storage tank. Relates to the technical field of mechanical vibration measurement, impact measurement and pipeline systems. The system consists of a leakage monitoring system host and a field distributed optical fiber; the on-site distributed optical fibers are laid in the heat insulation layer between the inner tank bottom plate and the outer tank bottom plate of the LNG storage tank and in the heat insulation layer between the inner tank and the outer tank wall; the system host (1) arranged at a distance from the LNG storage tank is connected with an optical fiber splice closure (5) arranged outside the tank top of the LNG storage tank through a communication optical fiber (2), and the optical fiber splice closure (5) is connected with a tank wall monitoring optical fiber (3) and a tank bottom monitoring optical fiber (4). The invention has higher technical safety guarantee and effectively reduces the environmental pollution and safety risk caused by the leakage of the LNG storage tank.
Description
Technical field
The present invention is a kind of distribution type fiber-optic leakage monitoring system of LNG storage tank.Relate to the measurement of mechanical vibration, measurement and the pipe-line system technical field of impact.
Background technique
The LNG storage tank is the critical facility of LNG Liquefied natural gas receiving station.The full appearance formula LNG storage tank that present China has built all adopts the LNG leakage situation of monitoring storage tanks such as thermocouple, combustible gas detector, flame ion prober.8 thermocouples are installed at tank skin and jar end at full appearance formula LNG storage tank, have judged whether to leak according to the thermocouple measured temperature and have taken place; Simultaneously, at LNG storage tank tank deck and outer wall combustible gas detector and flame ion prober are installed, the rock gas of gasification generation and the flame ion that combustion of natural gas produces after leaking for monitoring LNG.Present this method exists that temperature monitoring point is very few, testing precision is lower, can't in time find the problem of a small amount of LNG leakage, and be difficult to determine the accurate position of leakage point, in addition, can't report to the police in the initial period that LNG leaks, very easily cause serious secondary disaster.Therefore relatively poor with the technical security protection of thermocouple, combustible gas detector and flame ion detector monitors LNG tank leak, can't effectively reduce environmental pollution and security risk that the LNG tank leak brings.
CN102242870A discloses a kind of distribution type fiber-optic leakage monitor of pipeline, but it only is applicable to pipeline, then is to meet the demands for the LNG storage tank.
Summary of the invention
The objective of the invention is to invent a kind of technical security protection higher, effectively reduce the distribution type fiber-optic leakage monitoring system of the LNG storage tank of environmental pollution that the LNG tank leak brings and security risk.
Technological scheme of the present invention is to adopt the optical fiber temperature-measurement sensor to make temperature transducer, sets up leakage monitoring system, and optical fiber is simultaneously as sensor measuring unit and signal transmission passage.Fibre Optical Sensor is surveyed and the signal transmission relies on optical signal and need not and powers, thereby this system has the intrinsic explosion-resistance characteristic, is not subjected to electromagnetic interference, is a kind of safe tank leak monitoring system.In addition, optical fiber transducer is a kind of distributed sensor, can monitor the temperature of optical fiber each point along the line in real time, has increased the monitoring point number greatly, effectively improves reliability and the Location accuracy of tank leak monitoring system.
Formation of the present invention as shown in Figure 1, system is made up of leakage monitoring system main frame and on-the-spot distribution type fiber-optic.System host comprises lasing light emitter, light path coupler, light splitter, optical filter, receiving machine, data acquisition process unit, isochronous controller and computer; The laser that lasing light emitter sends is mapped on the light path coupler, light path coupler connects on-the-spot distribution type fiber-optic by optical fiber, simultaneously connect light splitter by electric wire, be connected in series optical filter, receiving machine, data acquisition process unit behind the light splitter successively, there is being connected of input output the data acquisition process unit with computer; Lasing light emitter output is connected with the isochronous controller input, and isochronous controller has being connected of input output with computer; System host has software systems.
On-the-spot distribution type fiber-optic is laid in the interior tank bottom and the thermal insulation layer between the outer tank bottom of LNG storage tank, and interior jar, (see figure 2) in the thermal insulation layer between the jar tank skin outward.Be located at LNG storage tank system host 1 at a distance and connect the fiber optic closure 5 that is located at outside the LNG storage tank tank deck by telecommunication optical fiber 2, fiber optic closure 5 is connected with tank skin monitoring optical fiber 3 and jar end monitoring optical fiber 4 again.The laser that lasing light emitter sends is transferred to on-the-spot distribution type fiber-optic after being coupled by light path coupler, and laser is returned by the optical fiber back reflection, arrives photoreceiver through light splitter and wave filter, and optical signal is transferred to computer through the data acquisition process unit.If a plurality of storage tanks are arranged, adopt fiber optic closure that all optical fiber are connected from beginning to end, and storage tank is numbered, optical fiber is carried out geocoding, link to each other with the Coupler of system host then.
When the LNG storage tank took place to leak, the tank bottom temperatures at localized regions can descend rapidly.The temperature effect of Raman scattering dorsad when transmitting in optical fiber according to laser pulse, the temperature that can obtain optical fiber each point along the line namely realizes the distributed measurement of temperature, thereby can carry out leakage monitoring and the leakage point location of LNG storage tank.
The electric principle of the distribution type fiber-optic leakage monitoring system of this LNG storage tank as shown in Figure 3.The FC joint of lasing light emitter is connected with the FC joint of light path coupler, the I/O FC joint of light path coupler connects the FC joint of 4 optical fiber, another FC joint of light path coupler connects the FC joint of light splitter, another FC joint of light splitter connects the FC joint of optical filter, another FC joint of optical filter connects the FC joint of optical isolation amplifier, the VHDCI interface of optical isolation amplifier connects the VHDCI interface of capture card, the pci interface of capture card connects the pci interface of computer, the RS232 interface of the RS232 interface device taking alarm of computer, the VGA interface of computer connects the VGA interface of display device.
The laser that lasing light emitter sends reaches optical fiber by light path coupler, after returning, optical fiber arrives light splitter from light path coupler, light splitter can separate with anti-Stokes light the Stokes in the reflected light, light after the separation is through finishing photoelectric conversion in optical isolation amplifier after the optical filter, by capture card electrical signal is carried out A/D conversion and sampling then, sampling gained data are finished processing in computer, if warning is arranged, then pass to alarm and report to the police.
The leakage monitoring system that employing is made up of leakage monitoring system main frame and on-the-spot distribution type fiber-optic carries out leakage monitoring, the light beam of laser emission is through optical fiber transducer, temperature field around the optical fiber transducer can cause light beam to produce Raman scattering in optical fiber, variation can be measured optical fiber transducer temperature field on every side according to the detection of reflected light wavelength, when the temperature of certain point is lower than alarm threshold value Ta, system host can carry out the leak position location Calculation, send acoustooptic alarm simultaneously, and display alarm position and temperature, record Alert data and time.
The present invention adopts distribution type fiber-optic tank leak monitoring system, compare with traditional thermocouple monitoring method, the distribution type fiber-optic leakage monitoring system has tangible advantage: the sensed system intrinsic is explosion-proof, be not subjected to electromagnetic interference, compact structure, highly sensitive, flexible and convenient to use, long service life, safe and reliable, in addition, the monitoring point of distribution type fiber-optic monitoring system is many, and convenience realizes the long Distance Transmission of transducing signal and focuses on.
Distribution type fiber-optic tank leak monitoring system can realize the real-time monitoring of LNG tank leak, accurately reflects the running state of LNG storage tank.This system monitoring precision height, fast, the accurate positioning, reliable and stable of reaction velocity can show leakage informations such as tank leak position and leak time in real time.In addition, but system also distribute in the temperature field of real time record storage tank bottom, can show with curve and digital dual mode, but the Monitoring Data longer-term storage, convenient inquiry.
The present invention is applicable to the full appearance formula LNG storage tank of various sizes, is used for the leakage situation of monitoring storage tank.At present domestic nearly more than ten of the LNG receiving station that builds and plan to build, total dozens of holds formula LNG storage tank entirely, and in addition, partial L NG peak regulation station and LNG generate factory and also have full appearance formula LNG storage tank, all full appearance formula LNG storage tanks all can adopt this technology, improve its safety monitoring level.Therefore, this technology has more wide application prospect.
Description of drawings
The distribution type fiber-optic leakage monitoring system theory diagram of Fig. 1 LNG storage tank
Fig. 2 distribution type fiber-optic is at the schematic representation that lays of storage tank bottom
The distribution type fiber-optic leakage monitoring system photovoltaic principals figure of Fig. 3 LNG storage tank
1-system host 2-telecommunication optical fiber wherein
Monitoring optical fiber at the bottom of the 3-tank skin monitoring optical fiber 4-jar
The 5-fiber optic closure
Embodiment
Embodiment. this example is the experimental prototype to the distribution type fiber-optic leakage monitoring system of 1000 sides meter LNG storage tank.Its theory diagram as shown in Figure 1.
System is made up of leakage monitoring system main frame and on-the-spot distribution type fiber-optic.System host comprises lasing light emitter, light path coupler, light splitter, optical filter, receiving machine, data acquisition process unit, isochronous controller and computer; The laser that lasing light emitter sends is mapped on the light path coupler, light path coupler connects on-the-spot distribution type fiber-optic by optical fiber, simultaneously connect light splitter by electric wire, be connected in series optical filter, receiving machine, data acquisition process unit behind the light splitter successively, there is being connected of input output the data acquisition process unit with computer; Lasing light emitter output is connected with the isochronous controller input, and isochronous controller has being connected of input output with computer; System host has software systems.
On-the-spot distribution type fiber-optic is laid in the interior tank bottom and the thermal insulation layer between the outer tank bottom of LNG storage tank, and interior jar, (see figure 2) in the thermal insulation layer between the jar tank skin outward.Be located at LNG storage tank system host 1 at a distance and connect the fiber optic closure 5 that is located at outside the LNG storage tank tank deck by telecommunication optical fiber 2, fiber optic closure 5 is connected with tank skin monitoring optical fiber 3 and jar end monitoring optical fiber 4 again.The laser that lasing light emitter sends is transferred to on-the-spot distribution type fiber-optic after being coupled by light path coupler, and laser is returned by the optical fiber back reflection, arrives photoreceiver through light splitter and wave filter, and optical signal is transferred to computer through the data acquisition process unit.
When the LNG storage tank took place to leak, the tank bottom temperatures at localized regions can descend rapidly.The temperature effect of Raman scattering dorsad when transmitting in optical fiber according to laser pulse, the temperature that can obtain optical fiber each point along the line namely realizes the distributed measurement of temperature, thereby can carry out leakage monitoring and the leakage point location of LNG storage tank.
The electric principle of the distribution type fiber-optic leakage monitoring system of this LNG storage tank as shown in Figure 3.The FC joint of lasing light emitter is connected with the FC joint of light path coupler, the I/O FC joint of light path coupler connects the FC joint of 4 optical fiber, another FC joint of light path coupler connects the FC joint of light splitter, another FC joint of light splitter connects the FC joint of optical filter, another FC joint of optical filter connects the FC joint of optical isolation amplifier, the VHDCI interface of optical isolation amplifier connects the VHDCI interface of capture card, the pci interface of capture card connects the pci interface of computer, the RS232 interface of the RS232 interface device taking alarm of computer, the VGA interface of computer connects the VGA interface of display device.
Wherein the model of each components and parts is as follows:
Light path coupler selects M302399 3db;
Lasing light emitter selects EXFO FLS-300;
Light splitter selects OSF GC-1001;
Optical filter selects LW-2686;
Optical isolation amplifier selects HCPL-7800A;
Capture card selects NI PCI6250.
This example is through test, proves that this sensed system intrinsic is explosion-proof, is not subjected to electromagnetic interference, compact structure, highly sensitive, flexible and convenient to use, long service life, safe and reliable, and the monitoring point is many, the convenient long Distance Transmission that realizes transducing signal with focus on.
Claims (2)
1. the distribution type fiber-optic leakage monitoring system of a LNG storage tank comprises leakage monitoring system main frame and on-the-spot distribution type fiber-optic; System host comprises lasing light emitter, light path coupler, light splitter, optical filter, receiving machine, data acquisition process unit, isochronous controller and computer; The laser that lasing light emitter sends is mapped on the light path coupler, light path coupler connects on-the-spot distribution type fiber-optic by optical fiber, simultaneously connect light splitter by electric wire, be connected in series optical filter, receiving machine, data acquisition process unit behind the light splitter successively, there is being connected of input output the data acquisition process unit with computer; Lasing light emitter output is connected with the isochronous controller input, and isochronous controller has being connected of input output with computer; System host has software systems; It is characterized in that on-the-spot distribution type fiber-optic is laid in the interior tank bottom and the thermal insulation layer between the outer tank bottom of LNG storage tank, and interior jar, outward in the thermal insulation layer between the jar tank skin; Be located at LNG storage tank system host (1) at a distance and connect the fiber optic closure (5) that is located at outside the LNG storage tank tank deck by telecommunication optical fiber (2), fiber optic closure (5) is connected with tank skin monitoring optical fiber (3) and jar end monitoring optical fiber (4) again;
The laser that lasing light emitter sends is transferred to on-the-spot distribution type fiber-optic after being coupled by light path coupler, and laser is returned by the optical fiber back reflection, arrives photoreceiver through light splitter and wave filter, and optical signal is transferred to computer through the data acquisition process unit; Or a plurality of storage tanks are arranged, and adopt fiber optic closure that all optical fiber are connected from beginning to end, and storage tank is numbered, optical fiber is carried out geocoding, link to each other with the Coupler of system host then.
2. the distribution type fiber-optic leakage monitoring system of LNG storage tank according to claim 1, the electric principle that it is characterized in that the distribution type fiber-optic leakage monitoring system of this LNG storage tank is: the FC joint of lasing light emitter is connected with the FC joint of light path coupler, the I/O FC joint of light path coupler connects the FC joint of 4 optical fiber, another FC joint of light path coupler connects the FC joint of light splitter, another FC joint of light splitter connects the FC joint of optical filter, another FC joint of optical filter connects the FC joint of optical isolation amplifier, the VHDCI interface of optical isolation amplifier connects the VHDCI interface of capture card, the pci interface of capture card connects the pci interface of computer, the RS232 interface of the RS232 interface device taking alarm of computer, the VGA interface of computer connects the VGA interface of display device;
The laser that lasing light emitter sends reaches optical fiber by light path coupler, after returning, optical fiber arrives light splitter from light path coupler, light splitter can separate with anti-Stokes light the Stokes in the reflected light, light after the separation is through finishing photoelectric conversion in optical isolation amplifier after the optical filter, by capture card electrical signal is carried out A/D conversion and sampling then, sampling gained data are finished processing in computer, if warning is arranged, then pass to alarm and report to the police.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103810812A (en) * | 2014-02-20 | 2014-05-21 | 陕西科技大学 | FBG transducer-based explosion pre-alarming device of oil tank truck |
| CN107098083A (en) * | 2017-04-19 | 2017-08-29 | 山东海益化工科技有限公司 | A kind of chlorine storage tank anti-leak monitoring system |
| CN108289130A (en) * | 2018-03-14 | 2018-07-17 | 浙江禹控科技有限公司 | A kind of intelligent terminal and data transmission method for water conservancy Internet of Things sensing control platform |
| CN108298216A (en) * | 2018-03-16 | 2018-07-20 | 安徽理工大学 | The monitoring system and method for oil storage tank leakage |
| US10151695B2 (en) | 2017-03-16 | 2018-12-11 | Oetiker Ny, Inc. | Optical assurance cap |
| CN109781346A (en) * | 2019-01-30 | 2019-05-21 | 青岛鸿瑞电力工程咨询有限公司 | A kind of high temperature melting salt cellar leakage real time on-line monitoring device and detection method |
| CN110641853A (en) * | 2019-09-26 | 2020-01-03 | 扬州工业职业技术学院 | Leakage early warning device for dangerous chemical transportation and use method thereof |
| CN112781810A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting leakage of storage tank |
| CN112780951A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting storage tank and pipeline invasion event |
| CN116817175A (en) * | 2023-08-31 | 2023-09-29 | 四川雅韵能源开发有限责任公司 | Liquefied natural gas storage tank monitoring and early warning method based on optical fiber sensing |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103810812A (en) * | 2014-02-20 | 2014-05-21 | 陕西科技大学 | FBG transducer-based explosion pre-alarming device of oil tank truck |
| US10151695B2 (en) | 2017-03-16 | 2018-12-11 | Oetiker Ny, Inc. | Optical assurance cap |
| CN107098083A (en) * | 2017-04-19 | 2017-08-29 | 山东海益化工科技有限公司 | A kind of chlorine storage tank anti-leak monitoring system |
| CN107098083B (en) * | 2017-04-19 | 2019-03-26 | 山东海益化工科技有限公司 | A kind of chlorine storage tank anti-leak monitoring system |
| CN108289130B (en) * | 2018-03-14 | 2021-07-06 | 浙江禹控科技有限公司 | Intelligent terminal for water conservancy Internet of things sensing and controlling platform and data transmission method |
| CN108289130A (en) * | 2018-03-14 | 2018-07-17 | 浙江禹控科技有限公司 | A kind of intelligent terminal and data transmission method for water conservancy Internet of Things sensing control platform |
| CN108298216A (en) * | 2018-03-16 | 2018-07-20 | 安徽理工大学 | The monitoring system and method for oil storage tank leakage |
| CN109781346A (en) * | 2019-01-30 | 2019-05-21 | 青岛鸿瑞电力工程咨询有限公司 | A kind of high temperature melting salt cellar leakage real time on-line monitoring device and detection method |
| CN110641853B (en) * | 2019-09-26 | 2021-06-22 | 扬州工业职业技术学院 | Leakage early warning device for dangerous chemical transportation and use method thereof |
| CN110641853A (en) * | 2019-09-26 | 2020-01-03 | 扬州工业职业技术学院 | Leakage early warning device for dangerous chemical transportation and use method thereof |
| CN112781810A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting leakage of storage tank |
| CN112780951A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting storage tank and pipeline invasion event |
| CN116817175A (en) * | 2023-08-31 | 2023-09-29 | 四川雅韵能源开发有限责任公司 | Liquefied natural gas storage tank monitoring and early warning method based on optical fiber sensing |
| CN116817175B (en) * | 2023-08-31 | 2023-11-14 | 四川雅韵能源开发有限责任公司 | Liquefied natural gas storage tank monitoring and early warning method based on optical fiber sensing |
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