CN106678551A - Leakage detecting system and method for high-pressure CO2 pipeline - Google Patents
Leakage detecting system and method for high-pressure CO2 pipeline Download PDFInfo
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- CN106678551A CN106678551A CN201710127521.7A CN201710127521A CN106678551A CN 106678551 A CN106678551 A CN 106678551A CN 201710127521 A CN201710127521 A CN 201710127521A CN 106678551 A CN106678551 A CN 106678551A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
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Abstract
The invention discloses a leakage detecting system and method for a high-pressure CO2 pipeline. The leakage detecting system comprises a sensing optical fiber, a host, a signal processing device and a master control system, wherein the sensing optical fiber is arranged in lower-layer soil of the high-pressure CO2 pipeline, is connected with the host, receives signals sent by the host and feeds the signals back to the host; the host transmits the signals fed back to the signal processing device for processing; the signal processing device is connected with the master control system; the host comprises a laser-pulse light source device, a scattering-light separating device, a photoelectric detection device and a constant-temperature device; the laser-pulse light source device sends pulse signals to the sensing optical fiber; and the signals fed back by the sensing optical fiber pass through the constant-temperature device, the scattering-light separating device and the photoelectric detection device and then reach to the signal processing device. The leakage detecting system and method disclosed by the invention have the advantages that detection for leakage points of the high-pressure CO2 pipeline is effectively realized by the Joule-Thompson effect, the Raman principle and the optical time-domain reflection principle.
Description
Technical field
The invention belongs to CO2The technical field of pipeline leakage testing, more particularly to a kind of Compressed CO_2 pipeline leakage testing system
System and method.
Background technology
With increasingly serious, the countries in the world also increasingly reduction of discharging of attention greenhouse gases of Global Greenhouse Effect.And CO2It is
Cause the topmost greenhouse gases of greenhouse effect, for the percentage contribution of global warming, CO2Account for 55%.Therefore
CCUS (carbon is trapped, transports, buries and utilized) technology is arisen at the historic moment, carbon trapping be by produced by the industries such as industry, the energy out
CO2Separate, then means are stored by CO by carbon2Be transported to seabed or ground it is inferior with atmospheric isolation where.This is to subtract
Few CO2Discharge, the powerful mean for tackling global warming.But discharge CO2With seal up for safekeeping distance between ground be separated by it is thousand of multifarious
Rice, therefore, need to use pipeline CO trapping place and burying place2It is fast economic mode.
Pure CO2It is colourless, tasteless, nontoxic, non-flammable material.Pure CO2Three phase point be 0.52MPa, -56 DEG C；Face
Boundary's point be 7.4MPa, 31 DEG C.When higher than critical-point pressure and temperature, CO2In supercritical or close phase state, now, CO2Tool
There are the density of liquid, the viscosity of gas and compressibility, for pipeline transportation is full blast.Therefore, in order to improve CO2Pipeline
Transfer efficiency, CO2 pipelines are conveyed generally under high pressure (above-critical state or close phase).Although CO2Do not have as natural gas
Inflammable and explosive fried characteristic, but, the carbon dioxide of such high pressure is once generation leakage accident is abnormally dangerous, and fatality rate is high.
After CO 2 high pressure transport pipeline is leaked, the most directly injury is exactly that its powerful air-flow can directly kill injection
Personnel in direction, spray regime, next to that gas concentration lwevel is excessive in environment near causing, causes cerebral anoxia or even stop up
Breath is dead.
Traditional method for detecting pipeline, for example, manually check regularly at inspection CO2During pipeline leakage, because CO2With colourless
Tasteless the characteristics of, generally in CO2It is difficult to be detected by conventional method when pipeline is leaked.Therefore, CO is studied2Pipeline is let out
Missing inspection survey technology is particularly important.Existing CO2The detection method of pipeline leakage, according to flow out and flow ipe mass of medium/
Difference between volume judges CO2The leakage of pipeline.But CO2The detection method of pipeline leakage can not be positioned to leakage point,
And real-time is poor；And for small-bore leaks helpless.
However, current most of technology is all the technology of oil and gas pipeline leakage detection, for CO2This special gas
Pipe safety control is relatively fewer with the technology of Leak Detection.In current CO2The Disciplinary Frontiers master of the detection method of pipeline leakage
The research direction wanted is echo sounding.Echo sounding is to utilize CO2" sound " sent during leakage determines leak source position, main
To include measure on stress pulse method and acoustic emission detection method, wherein measure on stress pulse method is used than wide.Work as CO2Pipeline is let out
During leakage, gas leakage can produce stress wave with the friction of leakage hole wall, and this stress wave is propagated along tube wall, be installed using pipe ends
The piezoelectric transducer sensitive to stress wave, the time difference estimation that two piezoelectric transducers are received is calculated according to principle of correlation analysis
Leakage point position.But stress wave has the interference of various noise, such as industrial frequency noise, environment noise in communication process
Deng the accuracy for affecting leakage point to detect.
Chinese patent literature CN104456091A discloses a kind of fibre optic interferometer CO based on 3 × 3 bonders2Pipeline is let out
Device for detecting leakage is efficiently solved in prospection stress wave detection method because noise jamming stress wave propagation affects leakage point detection accuracy
Problem.The device includes signal transmitting and processing system, optical fiber sensing system, Signal Analysis System, light source, the first single-mode optics
Fibre, the first bonder, the second single-mode fiber, optical circulator, the 3rd single-mode fiber, the 4th single-mode fiber, the 5th single-mode fiber,
Two bonders, the first sensor fibre, the second sensor fibre, the first optical-electrical converter, the second optical-electrical converter, the first solution mode transfer
Block, the second demodulation module, computer.Optical signal Jing optical-electrical converters are converted into the signal of telecommunication, then demodulated, into computer,
It is determined that leakage situation and leakage point position.This device detectable pipeline leakage situation along the line, is especially suitable for entering big-diameter pipeline
Row detection, for CO2This special transport gas, can be with significantly temperature drop, due to fiber work temperature model in leakage
Enclose big, make device that still there is very high sensitivity and positioning precision under temperature drop.
The paper " the pipe leakage Position Research based on acoustic sensor " of North China Electric Power University Ma Yifan discloses one kind
CO based on acoustic emission2Transport pipeline Leak Detection platform, belongs to acoustic emission detection method, using Multisensor Data Fusion Algorithm
Positioning precision is improved, the sensor that will leak out hole upstream and downstream is respectively divided into two groups, and two groups of signals carry out respectively cross-correlation, in order to go
Except background noise interference, the feature of acoustic emission signal is extracted, acoustical signal is carried out using wavelet transformation and empirical mode decomposition
Reconstruct, increases the fault-tolerance and Position location accuracy of detecting system.But, employ in the paper pipeline it is intrinsic pressure for 0.5MPa,
The leakage orientation problem that gaseous state CO2 is propagated in the duct, and in actual CCUS technologies application, CO2 is faced with super
Boundary's state transfer, and only consideration CO2 pipelines are the section of preferable straight tube, do not consider pipe welding seam and adpting flange or bend
In the case of acoustic signal propagation aberration problems.
In sum, for high pressure (above-critical state or close phase) CO in prior art2Leakage point present in pipe detection
Low inaccurate, precision, low detection efficiency and the poor problem of real-time, susceptiveness are positioned, and for the leakage point of small-bore
There is a problem of missing inspection, still lack effective solution.
The content of the invention
The present invention is overcome in prior art for high pressure (above-critical state or close phase) CO to solve the above problems2Pipeline
Leak point positioning present in detection is inaccurate, precision is low, detection efficiency is low and the poor problem of real-time, susceptiveness, and
For there is missing inspection in the leakage point of small-bore, there is provided a kind of Compressed CO_2 pipeline leakage checking system and method.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of Compressed CO_2 pipeline leakage checking system, the system includes sensor fibre, main frame, signal processing apparatus and master
Control system, the sensor fibre is arranged in Compressed CO_2 pipeline lower soil, and the sensor fibre is connected with the main frame, institute
State sensor fibre and receive the signal that the main frame sends, and feedback signal is to main frame, the main frame is by feedback signal transmission to letter
Number processing meanss are processed, and the signal processing apparatus are connected with the master control system；
The main frame includes laser pulse light supply apparatuses, scattered light segregation apparatuss, Electro-Optical Sensor Set and thermostat, institute
State laser pulse light source pulse signal to be sent to the sensor fibre, the feedback signal of the sensor fibre sequentially passes through described
Thermostat, scattered light segregation apparatuss and Electro-Optical Sensor Set are to the signal processing apparatus.
Further, the master control system includes server, display unit, alarm unit and data base；The server
It is connected with the display unit, the alarm unit and the data base respectively；
The recording unit when server is configured to the setting unit of systematic parameter, real-time monitoring unit sum factually,
And stored the data transfer of real time record to data base；
The display unit is display configured to the figure shows of the Real-time Feedback signal after processing and CO2 pipe leakage points
Unit, the Real-time Feedback signal after process is shown by the form of track；
The alarm unit is configured to the unit reported to the police when detecting with CO2 pipe leakage points；
The data base is configured to the unit of the feedback signal for storing sensor fibre.
Further, the master control system sends the systematic parameter of setting to the laser pulse by signal generator
Light supply apparatuses, control the laser pulse light supply apparatuses and produce corresponding pulse signal.
Further, the thermostat is configured to supply the sensor fibre robot scaling equipment of reference temperature.
Further, the laser pulse light supply apparatuses include high impulse semiconductor laser and drive circuit, the drive
Galvanic electricity road receives the signal of the signal generator transmission, and drives the high impulse semiconductor laser to produce corresponding arteries and veins
Rush signal.
Further, the scattered light segregation apparatuss include bidirectional coupler and wavelength division multiplexer, the bidirectional coupler
Connect with the wavelength division multiplexer, the bidirectional coupler includes light emitting diode and photosensitive two-way pipe, the bidirectional coupler
Input stage be light emitting diode, output stage be photosensitive two-way pipe.
Further, the Electro-Optical Sensor Set includes photodiode and main amplifier, the photodiode difference
It is connected with the wavelength division multiplexer and main amplifier；The photodiode is adopted with tail optical fiber, the snowslide light with preamplifier
Electric diode.
Further, the signal processing apparatus include A/D collecting units and signal processing unit, and the A/D collections are single
The amplification signal of unit's collection main amplifier output, and A/D conversions are carried out, the signal processing unit is to the amplification after A/D conversions
Signal is nursed one's health, cumulative mean and denoising.
The present invention is overcome in prior art for high pressure (above-critical state or close phase) CO to solve the above problems2Pipeline
Leak point positioning present in detection is inaccurate, precision is low, detection efficiency is low and the poor problem of real-time, susceptiveness, and
For there is missing inspection in the leakage point of small-bore, there is provided a kind of detection method of Compressed CO_2 pipeline leakage checking system.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of detection method of Compressed CO_2 pipeline leakage checking system, the method is comprised the following steps：
(1) sensor fibre is laid in soil below Compressed CO_2 pipeline；
(2) artificial in the server of the master control system to arrange systematic parameter, the master control system leads to systematic parameter
Cross signal generator to send to the laser pulse light supply apparatuses, control the laser pulse light supply apparatuses and produce corresponding pulse
Signal；
(3) bidirectional coupler described in the pulse signal Jing is transmitted to the whole sensor fibre, the sensor fibre root
According to optical time domain reflection principle detection Compressed CO_2 pipe leakage point position, and pass sequentially through main frame, signal processing apparatus and master control system
System, by the Real-time Feedback signal after the display unit display processing and the figure shows of CO2 pipe leakage points, by the warning
Unit is reported to the police.
Further, in the step (3), Compressed CO_2 pipe leakage point is by Raman principle and joule-thompson effect
Should be detected by sensor fibre.
The present invention principle be：
The present invention carries out the principle of Compressed CO_2 pipeline leakage testing mainly includes three parts：Joule-Thompson effect,
Raman principle and optical time domain reflection principle.
Raman principle：India scientist Raman is found that first when light and after interaction of molecules in CCl4 spectrum, one
The wavelength of part light can change (color changes), the research of the scattered light by changing for these colors,
The information of molecule is obtained.And Raman scattering is caused due to molecular thermalmotion, so Raman diffused light can carry scattering point
Temperature information.
Joule-Thompson effect：When Compressed CO_2 pipeline is leaked, because the physical property of CO2 is different from oil gas, it may occur that
Strong throttle effect (joule-Thompson effect), the CO2 fluid temperature (F.T.)s leaking in soil significantly drop compared to surrounding
It is low, there are some researches show that minimum temperature is reachable -78 DEG C.So as to cause the temperature that sensor fibre at leakage point is detected to occur violent
Change, when reaching setting value alarm is sent.
Optical time domain reflection principle：The position of leakage point is measured by optical time domain reflection technology, and optical fiber is sent out first
Go out signal, the information that then again observation signal is returned from certain point, so repeatedly, then these information that will be observed that are processed
And showed in the form of track, and this track is described be exactly whole section of optical fiber state.Dissipated according to the time domain of optical fiber
The principle penetrated, by the computing formula of optical time domain reflection range determination the position of leakage point is obtained.Thus, distribution type fiber-optic leakage
Detecting system can fully achieve the positioning to CO2 leakage points.
Beneficial effects of the present invention：
1st, the detection method of a kind of Compressed CO_2 pipeline leakage checking system of the invention, creative combines：Joule-
Thompson effect, Raman principle and optical time domain reflection principle, effectively realize high pressure (above-critical state or close phase) CO2 pipe leakages
Leak point positioning in detection is accurately, high precision, detection efficiency are high and have effectively heightened real-time and the spirit of whole detecting system
Quick property, meanwhile, the present invention covers whole high pressure (above-critical state or close phase) CO2 conduit regions using sensor fibre, without the need for arranging
A large amount of temperature sensors, it is to avoid the maintenance issues and the problem of high cost of temperature sensor.
2nd, a kind of Compressed CO_2 pipeline leakage checking system of the invention, is provided with thermostat and bidirectional coupler, constant temperature
Device：For solving the calibration of sensor fibre, there is provided reference temperature；Bidirectional coupler：For driving bidirectional thyristor, control is improved
Precision processed, input stage is light emitting diode, and output stage is photosensitive two-way pipe；Effectively increase the accuracy of measurement result；Simultaneously
The present invention is set using the photodiode with more preferable optical detection ability between photodetector unit and signal processing unit
Amplifier is put, the signal of telecommunication is amplified, improve accuracy of detection.
3rd, a kind of Compressed CO_2 pipeline leakage checking system of the invention, high pressure (above-critical state or close phase) CO2 pipelines are divided into
The sensor fibre put carries out real-time monitoring to the soil moisture of whole high pressure (above-critical state or close phase) CO2 Near Pipelines in real time,
Master control system real time record Monitoring Data, and the data transfer of real time record is stored to data base, effectively realize height
The real-time of pressure CO2 pipeline leakage checking systems.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Specific embodiment：
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Track machine used in the specific embodiment of the present invention is also referred to as Carriageway controlling machine in this area.
In the case where not conflicting, the feature in embodiment and embodiment in the application can be mutually combined.Tie below
The invention will be further described with embodiment to close accompanying drawing.
Embodiment 1：
The present invention is overcome in prior art for high pressure (above-critical state or close phase) CO to solve the above problems2Pipeline
Leak point positioning present in detection is inaccurate, precision is low, detection efficiency is low and the poor problem of real-time, susceptiveness, and
For there is missing inspection in the leakage point of small-bore, there is provided a kind of Compressed CO_2 pipeline leakage checking system and method.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of Compressed CO_2 pipeline leakage checking system, as shown in figure 1, the system is included at sensor fibre, main frame, signal
Reason device and master control system, the sensor fibre is arranged in Compressed CO_2 pipeline lower soil, the sensor fibre and the master
Machine connects, and the sensor fibre receives the signal that the main frame sends, and feedback signal is to main frame, and the main frame is by feedback signal
Transmit to signal processing apparatus and processed, the signal processing apparatus are connected with the master control system；
The main frame includes laser pulse light supply apparatuses, scattered light segregation apparatuss, Electro-Optical Sensor Set and thermostat, institute
State laser pulse light source pulse signal to be sent to the sensor fibre, the feedback signal of the sensor fibre sequentially passes through described
Thermostat, scattered light segregation apparatuss and Electro-Optical Sensor Set are to the signal processing apparatus.
In the present embodiment, when Compressed CO_2 pipeline is leaked, because the physical property of CO2 is different from oil gas, it may occur that strong
Throttle effect (joule-Thompson effect), the CO2 fluid temperature (F.T.)s leaking in soil are greatly lowered compared to surrounding,
Minimum temperature is reachable -78 DEG C.Therefore, the sensor fibre for being used is required to withstand -78 DEG C of low temperature, the sensor fibre
Outer surface adopt low temperature coating.
The master control system includes server, display unit, alarm unit and data base；The server respectively with it is described
Display unit, the alarm unit and data base connection；
The recording unit when server is configured to the setting unit of systematic parameter, real-time monitoring unit sum factually,
And stored the data transfer of real time record to data base；
The display unit is display configured to the figure shows of the Real-time Feedback signal after processing and CO2 pipe leakage points
Unit, the Real-time Feedback signal after process is shown by the form of track；
The alarm unit is configured to the unit reported to the police when detecting with CO2 pipe leakage points；
The data base is configured to the unit of the feedback signal for storing sensor fibre.
The master control system sends the systematic parameter of setting to the laser pulse light supply apparatuses by signal generator,
Control the laser pulse light supply apparatuses and produce corresponding pulse signal.
The thermostat is configured to supply the sensor fibre robot scaling equipment of reference temperature.
The laser pulse light supply apparatuses include high impulse semiconductor laser and drive circuit, and the drive circuit is received
The signal of the signal generator transmission, and drive the high impulse semiconductor laser to produce corresponding pulse signal.
The scattered light segregation apparatuss include bidirectional coupler and wavelength division multiplexer, the bidirectional coupler and the wavelength-division
Multiplexer connects, and the bidirectional coupler includes light emitting diode and photosensitive two-way pipe, and the input stage of the bidirectional coupler is
Light emitting diode, output stage are photosensitive two-way pipes.In the present embodiment, the bidirectional coupler is in conducting, and what is flow through is two-way
Up to 100 milliamperes, pressure drop is less than 3 volts to electric current, and extinction current is 100 microamperes during conducting.The bidirectional coupler cut-off when,
Its blocking voltage is 250 volts of direct current, and when maintaining electric current to be less than 100 microamperes, two-way pipe is changed into cut-off from conducting.Work as blocking voltage
More than 250 volts, or during lumination of light emitting diode, then two-way pipe conducting.
The Electro-Optical Sensor Set includes photodiode and main amplifier, the photodiode respectively with the wavelength-division
Multiplexer and main amplifier connect；The photodiode is adopted with tail optical fiber, the avalanche photodide with preamplifier.
The signal processing apparatus include A/D collecting units and signal processing unit, and the A/D collecting units collection master is put
The amplification signal of big device output, and A/D conversions are carried out, the signal processing unit is adjusted to the amplification signal after A/D conversions
Reason, cumulative mean and denoising.
Embodiment 2：
The present invention is overcome in prior art for high pressure (above-critical state or close phase) CO to solve the above problems2Pipeline
Leak point positioning present in detection is inaccurate, precision is low, detection efficiency is low and the poor problem of real-time, susceptiveness, and
For there is missing inspection in the leakage point of small-bore, there is provided a kind of detection method of Compressed CO_2 pipeline leakage checking system.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of detection method of Compressed CO_2 pipeline leakage checking system, the method is comprised the following steps：
(1) sensor fibre is laid in soil below Compressed CO_2 pipeline；
(2) artificial in the server of the master control system to arrange systematic parameter, the master control system leads to systematic parameter
Cross signal generator to send to the laser pulse light supply apparatuses, control the laser pulse light supply apparatuses and produce corresponding pulse
Signal；
In the present embodiment, the artificial systematic parameter for arranging is specifically included to sensing in the server of the master control system
The associated signal parameter of optical fiber sending signal and the alarm parameters of CO2 pipe leakages.
(3) bidirectional coupler described in the pulse signal Jing is transmitted to the whole sensor fibre, the sensor fibre root
According to optical time domain reflection principle detection Compressed CO_2 pipe leakage point position, and pass sequentially through main frame, signal processing apparatus and master control system
System, by the Real-time Feedback signal after the display unit display processing and the figure shows of CO2 pipe leakage points, reaches and manually sets
Reported to the police by the alarm unit after fixed alarm parameters.
Further, in the step (2), Compressed CO_2 pipe leakage point is by Raman principle and joule-thompson effect
Should be detected by sensor fibre.
The present invention principle be：
The present invention carries out the principle of Compressed CO_2 pipeline leakage testing mainly includes three parts：Joule-Thompson effect,
Raman principle and optical time domain reflection principle.
Raman principle：India scientist Raman is found that first when light and after interaction of molecules in CCl4 spectrum, one
The wavelength of part light can change (color changes), the research of the scattered light by changing for these colors,
The information of molecule is obtained.And Raman scattering is caused due to molecular thermalmotion, so Raman diffused light can carry scattering point
Temperature information.
Joule-Thompson effect：When Compressed CO_2 pipeline is leaked, because the physical property of CO2 is different from oil gas, it may occur that
Strong throttle effect (joule-Thompson effect), the CO2 fluid temperature (F.T.)s leaking in soil significantly drop compared to surrounding
It is low, there are some researches show that minimum temperature is reachable -78 DEG C.So as to cause the temperature that sensor fibre at leakage point is detected to occur violent
Change, when reaching setting value alarm is sent.
Optical time domain reflection principle：The position of leakage point is measured by optical time domain reflection technology, and optical fiber is sent out first
Go out signal, the information that then again observation signal is returned from certain point, so repeatedly, then these information that will be observed that are processed
And showed in the form of track, and this track is described be exactly whole section of optical fiber state.Dissipated according to the time domain of optical fiber
The principle penetrated, by the computing formula of optical time domain reflection range determination the position of leakage point is obtained.Thus, distribution type fiber-optic leakage
Detecting system can fully achieve the positioning to CO2 leakage points.
Beneficial effects of the present invention：
1st, the detection method of a kind of Compressed CO_2 pipeline leakage checking system of the invention, creative combines：Joule-
Thompson effect, Raman principle and optical time domain reflection principle, effectively realize high pressure (above-critical state or close phase) CO2 pipe leakages
Leak point positioning in detection is accurately, high precision, detection efficiency are high and have effectively heightened real-time and the spirit of whole detecting system
Quick property, meanwhile, the present invention covers whole high pressure (above-critical state or close phase) CO2 conduit regions using sensor fibre, without the need for arranging
A large amount of temperature sensors, it is to avoid the maintenance issues and the problem of high cost of temperature sensor.
2nd, a kind of Compressed CO_2 pipeline leakage checking system of the invention, is provided with thermostat and bidirectional coupler, constant temperature
Device：For solving the calibration of sensor fibre, there is provided reference temperature；Bidirectional coupler：For driving bidirectional thyristor, control is improved
Precision processed, input stage is light emitting diode, and output stage is photosensitive two-way pipe；Effectively increase the accuracy of measurement result；Simultaneously
The present invention is set using the photodiode with more preferable optical detection ability between photodetector unit and signal processing unit
Amplifier is put, the signal of telecommunication is amplified, improve accuracy of detection.
3rd, a kind of Compressed CO_2 pipeline leakage checking system of the invention, high pressure (above-critical state or close phase) CO2 pipelines are divided into
The sensor fibre put carries out real-time monitoring to the soil moisture of whole high pressure (above-critical state or close phase) CO2 Near Pipelines in real time,
Master control system real time record Monitoring Data, and the data transfer of real time record is stored to data base, effectively realize height
The real-time of pressure CO2 pipeline leakage checking systems.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of Compressed CO_2 pipeline leakage checking system, is characterized in that：The system includes sensor fibre, main frame, signal processing device
Put and master control system, the sensor fibre is arranged in Compressed CO_2 pipeline lower soil, and the sensor fibre connects with the main frame
Connect, the sensor fibre receives the signal that the main frame sends, and feedback signal is to main frame, the main frame is by feedback signal transmission
Processed to signal processing apparatus, the signal processing apparatus are connected with the master control system；
The main frame includes laser pulse light supply apparatuses, scattered light segregation apparatuss, Electro-Optical Sensor Set and thermostat, described to swash
Optical pulse light source sends pulse signal to the sensor fibre, and the feedback signal of the sensor fibre sequentially passes through the constant temperature
Device, scattered light segregation apparatuss and Electro-Optical Sensor Set are to the signal processing apparatus.
2. a kind of Compressed CO_2 pipeline leakage checking system as claimed in claim 1, is characterized in that：The master control system includes
Server, display unit, alarm unit and data base；The server respectively with the display unit, the alarm unit and
Data base's connection；
The recording unit when server is configured to the setting unit of systematic parameter, real-time monitoring unit sum factually, and will
The data transfer of real time record is stored to data base；
The display unit is display configured to the figure shows list of the Real-time Feedback signal after processing and CO2 pipe leakage points
Unit, the Real-time Feedback signal after process is shown by the form of track；
The alarm unit is configured to the unit reported to the police when detecting with CO2 pipe leakage points；
The data base is configured to the unit of the feedback signal for storing sensor fibre.
3. a kind of Compressed CO_2 pipeline leakage checking system as claimed in claim 1, is characterized in that：The master control system will set
The systematic parameter put is sent to the laser pulse light supply apparatuses by signal generator, controls the laser pulse light supply apparatuses
Produce corresponding pulse signal.
4. a kind of Compressed CO_2 pipeline leakage checking system as claimed in claim 1, is characterized in that：The thermostat is matched somebody with somebody
It is set to the sensor fibre robot scaling equipment that reference temperature is provided.
5. a kind of Compressed CO_2 pipeline leakage checking system as claimed in claim 1, is characterized in that：The laser pulse light source
Device includes high impulse semiconductor laser and drive circuit, and the drive circuit receives the letter of the signal generator transmission
Number, and drive the high impulse semiconductor laser to produce corresponding pulse signal.
6. a kind of Compressed CO_2 pipeline leakage checking system as claimed in claim 1, is characterized in that：The scattered light separates dress
Put including bidirectional coupler and wavelength division multiplexer, the bidirectional coupler and the wavelength division multiplexer connect, the bidirectional coupled
Device includes light emitting diode and photosensitive two-way pipe, and it is photosensitive that the input stage of the bidirectional coupler is light emitting diode, output stage
Two-way pipe.
7. a kind of Compressed CO_2 pipeline leakage checking system as claimed in claim 1, is characterized in that：The Electro-Optical Sensor Set
Including photodiode and main amplifier, the photodiode is connected respectively with the wavelength division multiplexer and main amplifier；Institute
State photodiode to adopt with tail optical fiber, the avalanche photodide with preamplifier.
8. a kind of Compressed CO_2 pipeline leakage checking system as claimed in claim 1, is characterized in that：The signal processing apparatus
Including A/D collecting units and signal processing unit, the amplification signal of the A/D collecting units collection main amplifier output, go forward side by side
Row A/D is changed, and the signal processing unit is nursed one's health the amplification signal after A/D conversions, cumulative mean and denoising.
9. a kind of detection method of Compressed CO_2 pipeline leakage checking system, the method is comprised the following steps：
(1) sensor fibre is laid in soil below Compressed CO_2 pipeline；
(2) artificial in the server of the master control system to arrange systematic parameter, the master control system is by systematic parameter by letter
Number generator is sent to the laser pulse light supply apparatuses, is controlled the laser pulse light supply apparatuses and is produced corresponding pulse letter
Number；
(3) bidirectional coupler described in the pulse signal Jing is transmitted to the whole sensor fibre, and the sensor fibre is according to light
Time Domain Reflectometry principle detection Compressed CO_2 pipe leakage point position, and main frame, signal processing apparatus and master control system are passed sequentially through,
By the Real-time Feedback signal after the display unit display processing and the figure shows of CO2 pipe leakage points, report to the police single by described
Unit is reported to the police.
10. a kind of Compressed CO_2 pipeline leakage checking system as claimed in claim 9, is characterized in that：In the step (3),
Compressed CO_2 pipe leakage point is detected by Raman principle and joule-Thompson effect by sensor fibre.
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