CN208076114U - Natural gas station based on AWG array optical waveguides leaks early warning system - Google Patents
Natural gas station based on AWG array optical waveguides leaks early warning system Download PDFInfo
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- CN208076114U CN208076114U CN201721298613.3U CN201721298613U CN208076114U CN 208076114 U CN208076114 U CN 208076114U CN 201721298613 U CN201721298613 U CN 201721298613U CN 208076114 U CN208076114 U CN 208076114U
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- awg
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Abstract
The utility model discloses the natural gas stations based on AWG array optical waveguides to leak early warning system, is related to natural gas early warning technology field.Include the AWG sensing units of the ultrasonic wave for detecting the generation of natural gas station process equipment leakage signal；For AWG sensing unit the signal processing terminals；Control centre for controlling the signal processing terminal.The utility model is fiber medium by using sensor and transmission signal, passive, essential safety, and all -fiber networking is suitble to the combustible and explosive areas such as petrochemical industry, has explosion-proof, is had a safety feature；It can be connected several AWG sensing units by same root optical cable, each AWG sensing units are a highly sensitive ultrasonic sensor, can detect the ultrasonic wave that leakage signal generates, and then detect whether leakage natural gas and its leak the position of natural gas process equipment；The frequency response range by using the AWG voice signal detection units that FBG is constituted with very high sensitivity and MHz, is suitble to the ultrasonic signal generated to leakage to be detected.
Description
Technical field
The utility model belongs to natural gas early warning technology field, more particularly to the natural gas based on AWG array optical waveguides
Yard leaks early warning system.
Background technology
Natural gas is a kind of flammable explosive gas, and composition is mainly made of methane, and property is similar to pure methane, relatively close
(air=1) q=0.55 is spent, leakage, which such as occurs, to spread in air rapidly, when reaching 5%-15% with air melting concn
When range, explosive mixture is formed；There are fire, explosion danger when heat source, open fire.Natural gas category " simple asphyxiating " gas
Body causes personnel to suffocate when high concentration because of anoxic.When concentration of natural gas reaches 25%-30% in air, there is dizzy, breathing
Accelerate, ataxia.In addition natural gas and brominated bromide, chlorine, hypochlorous acid, Nitrogen trifluoride, liquid oxygen, bifluoride bromine, Strong oxdiative
The contacts such as agent being capable of vigorous reaction, the easily accidents such as initiation Poisoning choke, fire and explosion.
In the security risk for leading to natural gas leaking accident, Unsafe behavior is one of major risk factors, tool
Body shows as that enterprise staff safety education is not in place, and some of the staff's safe production awareness is thin, subjective off one's guard, is producing
It does not abide by safety regulation for operations in the process, operate against regulations, lead to leakage accident.
In addition, third-party artificial damage is also an outstanding problem for now resulting in natural gas leaking accident, city is given
The units in charge of construction such as drainage system, heat enginnering, strong and weak electrical engineering, which do not obtain, reflects the detailed of underground utilities position in its boundary of works area
Technical data to the greatest extent just goes into operation without authorization, and blindly construction causes natural gas line to be broken, and causes natural gas leaking.
Natural gas production-operation unit as high-risk management trade, only establish science, specification, uniformly, efficient combustion gas
Accident early warning and Lash-up succor system could improve combustion gas in gas supply compass of competency and take precautions against natural calamities and the integrated management ability of mitigation and anti-
Risk ability, could be rapid to start emergency management and rescue action, quick, product when safety accident occurs for cities and towns natural gas supply region
Pole, the in an orderly manner sprawling of control accident and disposition work safety accident, and restore gas supply as early as possible, combustion gas is reduced to greatest extent
Threat and harm of the accident to people's lives and properties.
The development and utilization of natural gas be unable to do without gas gathering and transportation system, and wherein gas gathering station is then important a ring.Due to
Natural gas collecting station production continuity, the complexity of industrial technology, production medium it is inflammable and explosive and toxic the features such as, collection
The safety problem of gas station production seems especially prominent.Currently, (data acquire and monitoring by natural gas collecting station station control system SCADA
Control system), major function is the pressure to each node of gas gathering station and element, temperature, flow, liquid level (water-oil separating liquid level, water
Position) etc. be monitored, to ensure that each parameter meets technological requirement, while preventing the formation of gas hydrates.In the presence of mainly asking
The shortcomings of topic is that data collection point is few, and signal processing precision is not high, No leakage alarm and positioning, rate of false alarm is high.To ensure gas collection
The safety control system except being controlled independently of production process is established in the safe operation stood, and in real time, accurately monitoring yard is natural
Gas leakage, it appears particularly important.
Utility model content
The purpose of this utility model is to provide the natural gas stations based on AWG array optical waveguides to leak early warning system, leads to
It is fiber medium to cross using sensor and transmission signal；Have by using the FBG AWG voice signal detection units constituted
The frequency response range of very high sensitivity and MHZ is suitble to the ultrasonic signal generated to leakage to be detected.
In order to solve the above technical problems, the utility model is achieved through the following technical solutions：
The utility model is that the natural gas station based on AWG array optical waveguides leaks early warning system, including is used to detect day
The AWG sensing units for the ultrasonic wave that right gas yard process equipment leakage signal generates；Signal processing for AWG sensing units is whole
End；Control centre for controlling the signal processing terminal.
Further, the AWG sensing units are connected on optical cable；The AWG sensing units are corresponding with process equipment.
Further, the process equipment is detected positioning by three or more AWG sensing units.
Further, the AWG sensing units specifically include the detection localization method of process equipment：
SS01 arranges several AWG sensing units in process equipment side；The AWG sensing units pass sequentially through optical cable string
Connection；
Whether SS02 characterization processes equipment leaks natural gas, if so, the frequency of the AWG sensing units of corresponding position, width
Degree feature changes；If it is not, then the frequency of the AWG sensing units of corresponding position, amplitude characteristic are without change；
SS03 confirms the position of leakage process equipment.The distribution of a triangular orientation is formed by three AWG sensing units,
Process equipment is located in the triangle of three AWG sensing units formation, and cardinal principle knows arbitrary triangle, the length of side,
Certain point is to the distance on three vertex it is known that can find out position of the point with respect to three vertex according to cosine formula among triangle
It sets.
Further, the method for early warning of the control centre specifically includes：
Step 1, AWG sensing units detect that natural gas leaking occurs for process equipment, are let out when natural gas occurs for process equipment
The variation of sound wave is generated when leakage；
Step 2, the signal that AWG sensing units detect carry out signal processing by central processing unit, obtain the frequency of signal
Rate information, time-frequency characteristics, power spectral energies distribution；
Step 3, analysis show that leak position and the leak sizes of natural gas leaking occur for process equipment；
Warning grade is divided into 1-n grades by step 4, grading forewarning system, and n is less than 10.
The utility model has the advantages that：
1, the utility model is fiber medium by using sensor and transmission signal, passive, essential safety, all -fiber
Networking is suitble to the combustible and explosive areas such as petrochemical industry, has explosion-proof, has a safety feature.
2, the utility model can be connected several AWG sensing units by same root optical cable, and each AWG sensing units are
One highly sensitive ultrasonic sensor, can detect leakage signal generate ultrasonic wave, and then detect whether leakage natural gas and its
Leak the position of natural gas process equipment.
3, the utility model has very high sensitivity and MHZ by using the AWG voice signal detection units that FBG is constituted
Frequency response range, be suitble to leakage generate ultrasonic signal be detected.
4, the utility model can be accurately positioned the position of process equipment leakage by using every three AWG sensing units,
By by the AWG of multiple distributions orientable sensors in series.
Certainly, any product for implementing the utility model does not necessarily require achieving all the advantages described above at the same time.
Description of the drawings
In order to illustrate more clearly of the technical solution of the utility model embodiment, make required for being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is that a kind of natural gas station based on AWG array optical waveguides of the utility model leaks early warning system figure；
Fig. 2 is positioning distribution map of the AWG sensing units to natural gas station process equipment；
The flow chart of Fig. 3 early warning at center in order to control；
Fig. 4 is the short time discrete Fourier transform result that typical leak signal frequency changes over time；
Fig. 5 is the demodulation principle figure of AWG；
Fig. 6 is that AWG sensing units position schematic diagram to the detection of process equipment.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
The all other embodiment obtained, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be understood that term " trepanning ", "upper", "lower", " thickness ", "top",
" in ", " length ", "inner", indicating positions or the position relationship such as " surrounding ", be merely for convenience of description the utility model and simplification
Description, does not indicate or imply the indicated component or element must have a particular orientation, with specific azimuth configuration and behaviour
Make, therefore should not be understood as limiting the present invention.
FBG FiberBragg Grating, as fiber grating, also known as fiber bragg grating.
AWGArrayedWaveguide Grating, i.e. array waveguide grating.
Fiber-optic grating sensor Fiber Grating Sensor belong to one kind of fibre optical sensor, based on fiber grating
Sensing process is to obtain heat transfer agent to the modulation of optical fiber Bragg Bragg wavelength by extraneous physical parameter, is a kind of wave
Long modulation fiber sensor.The direct measurement to physical quantitys such as temperature, strains may be implemented in fiber-optic grating sensor.
It please refers to Fig.1 shown in -2, the utility model is a kind of natural gas station leakage early warning based on AWG array optical waveguides
System includes the AWG sensing units of the ultrasonic wave for detecting the generation of natural gas station process equipment leakage signal；For AWG
The signal processing terminal of sensing unit；Control centre for controlling the signal processing terminal.
Wherein, AWG sensing units are connected on optical cable；The AWG sensing units are corresponding with process equipment.
Wherein, process equipment is detected positioning by three or more AWG sensing units.
Wherein as shown in fig. 6, AWG sensing units specifically include the detection localization method of process equipment：
SS01 arranges several AWG sensing units in process equipment side；The AWG sensing units pass sequentially through optical cable string
Connection；
Whether SS02 characterization processes equipment leaks natural gas, if so, the frequency of the AWG sensing units of corresponding position, width
Degree feature changes；If it is not, then the frequency of the AWG sensing units of corresponding position, amplitude characteristic are without change；
SS03 confirms the position of leakage process equipment.
First, the distance between 3 points of AWG1, AWG2, AWG3 is had been acknowledged, if adjacent 2 points of distance is L1, L2, L3,
Unknown leakage equipment is X；Then X arrives the distance of 3 points of AWG1, AWG2, AWG3 and is obtained by the following formula respectively：
X=Cg·ΔT；Wherein CgFor the aerial spread speed of gas leakage sound；Δ T detects for AWG demodulating systems
To have leakage voice signal at the time of.
Wherein as shown in figure 3, the method for early warning of control centre specifically includes：
Step 1, AWG sensing units detect that natural gas leaking occurs for process equipment, are let out when natural gas occurs for process equipment
The variation of sound wave is generated when leakage；
Step 2, the signal that AWG sensing units detect carry out signal processing by central processing unit, obtain the frequency of signal
Rate information, time-frequency characteristics, power spectral energies distribution；
Step 3, analysis show that leak position and the leak sizes of natural gas leaking occur for process equipment；
Warning grade is divided into 1-2 grades by step 4, grading forewarning system, and level-one is used for the early warning of Shutting Down equipment, and two level is used
In the early warning of fire-fighting link.
As shown in figure 4, the short time discrete Fourier transform result changed over time for typical leak signal frequency.After leakage occurs
Frequency is up to 70KHZ, then rapid decay.
As shown in figure 5, for the demodulation principle of AWG, when there is ultrasonic wave 1 to act on AWG sensing units, AWG sensings are single
Member includes the grating sensitizing range 3 of oversheath 2 and FBG；The grating sensitizing range 3 of FBG is generated and shakes by the modulation of ultrasonic signal
Dynamic, corresponding grating is shunk, and wavelength is caused to move.The amount of movement is converted into electric signal by the demodulation of AWG demodulating systems,
Ultrasonic signal is restored.
A specific process equipment is monitored, such as flange, valve etc..Specifically 3 AWG sensing units are at isosceles
Rounded projections arranged is around process equipment.When the process equipment has potential leakage to occur, since natural gas station field device is pressure
Force container, leakage can make pressure generate mutation, high-frequency ultrasonic signal will produce under small-bore.It is examined by AWG sensing units
The range of the frequency is surveyed, amplitude size can be back-calculated to obtain leakage rate.Ultrasound signal transmission is generated to AWG by leakage point
The position of leakage can be calculated in the time of sensing unit.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained in at least one of the utility model
In embodiment or example.In the present specification, schematic expression of the above terms be not necessarily referring to identical embodiment or
Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more embodiments or example
In can be combined in any suitable manner.
The preferred embodiment in the utility model disclosed above is only intended to help to illustrate the utility model.Preferred embodiment is simultaneously
There is no the details that detailed descriptionthe is all, does not limit the specific implementation mode that the utility model is only described yet.Obviously, according to this theory
The content of bright book can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to preferably
The principles of the present invention and practical application are explained, to enable skilled artisan to be best understood by and utilize this
Utility model.The utility model is limited only by the claims and their full scope and equivalents.
Claims (1)
1. the natural gas station based on AWG array optical waveguides leaks early warning system, including is used for AWG sensing units signal processing end
End；Control centre for controlling the signal processing terminal；The AWG sensing units are connected on optical cable；It is characterized in that：Also wrap
Include the AWG sensing units of the ultrasonic wave for detecting the generation of natural gas station process equipment leakage signal；
The AWG sensing units are corresponding with process equipment；
The process equipment is detected positioning by three or more AWG sensing units.
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| CN201721298613.3U CN208076114U (en) | 2017-10-10 | 2017-10-10 | Natural gas station based on AWG array optical waveguides leaks early warning system |
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| CN201721298613.3U CN208076114U (en) | 2017-10-10 | 2017-10-10 | Natural gas station based on AWG array optical waveguides leaks early warning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114427940A (en) * | 2022-01-20 | 2022-05-03 | 北京工业大学 | High-pressure hydrogen leakage detection method and system |
-
2017
- 2017-10-10 CN CN201721298613.3U patent/CN208076114U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114427940A (en) * | 2022-01-20 | 2022-05-03 | 北京工业大学 | High-pressure hydrogen leakage detection method and system |
| CN114427940B (en) * | 2022-01-20 | 2024-03-08 | 北京工业大学 | High-pressure hydrogen leakage detection method and system |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181109 Termination date: 20201010 |