CN108298216A - The monitoring system and method for oil storage tank leakage - Google Patents
The monitoring system and method for oil storage tank leakage Download PDFInfo
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- CN108298216A CN108298216A CN201810217998.9A CN201810217998A CN108298216A CN 108298216 A CN108298216 A CN 108298216A CN 201810217998 A CN201810217998 A CN 201810217998A CN 108298216 A CN108298216 A CN 108298216A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/48—Arrangements of indicating or measuring devices
- B65D90/50—Arrangements of indicating or measuring devices of leakage-indicating devices
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- Examining Or Testing Airtightness (AREA)
Abstract
The present invention provides a kind of monitoring system and method for oil storage tank leakage.The system includes：High-density electric subsystem, distributed optical fiber temperature measurement subsystem, distributive fiber optic strain sensing subsystem and data processing equipment；Electrical method subsystem includes：Cable and parallel electrical prospecting apparatus；Parallel electrical prospecting apparatus is connect with the electrode of cable and data processing equipment respectively；Cable is laid in the outside at oil tank bottom；Optical fiber temperature-measurement subsystem includes heating optical cable, heating power supply and DTS demodulated equipments；One end of heating optical cable is connect with heating power supply, and the other end is connect with DTS demodulated equipments；Heating optical cable is laid on the outside at oil tank bottom and the inner wall of oil storage tank；Fibre strain senses subsystem：Straining and sensing optical cable and optical fiber demodulating apparatus；Straining and sensing optical cable is connect with optical fiber demodulating apparatus；DTS demodulated equipments and optical fiber demodulating apparatus are also connect with data processing equipment.The monitoring system of the present invention is higher for the real-time and accuracy of tank bottom leakage monitoring.
Description
Technical field
The monitoring system revealed the present invention relates to tank body leakage monitoring technical field more particularly to a kind of oil storage tank and side
Method.
Background technology
Currently, in order to ensure the demand of China's energy and industrial chemicals, positive establishes large-scale storage tank area, builds state
Family's strategic oil reserve system.Since oil storage tank is run under natural environment and liquid level change condition all the year round, inevitably
It the problems such as will appear aging, rupture, corrosion, is especially embedded in the strong oil storage tank bottom plate of underground concealed property and most easily produces hidden danger
Position, but the safe condition at oil tank bottom can not be usually observed directly, this results in occurring leaking even if tank bottom also being difficult to
It finds in time, it is even more impossible to the positions of accurate judgement leakage point.Therefore direct economic loss, the wasting of resources are will produce, and caused
The substantial pollution of soil environment and ground water regime, or even cause fire and explosion accident.Therefore carry out in real time or periodic monitoring and
It the leak positions Shi Faxian and eliminates safe hidden trouble, there is particularly important realistic meaning to the safe operation of oil storage tank.
In the prior art, can be by the Sensor monitoring tank bottom being arranged between oil tank bottom or double layers of walls
It is no to reveal, alternatively, being leaked oil reserve loss leakage in oil-gas leaking monitoring and tank by the monitoring of metal lossless leakage hidden danger, tank
The methods of monitoring is monitored.
Aforesaid way can only qualitatively be determined whether leakage, therefore cannot be satisfied and tank bottom leakage is promptly and accurately supervised
The demand of survey.
Invention content
The present invention provides a kind of monitoring system and method for oil storage tank leakage, to realize the prison to tank bottom leakage promptly and accurately
It surveys.
In a first aspect, the present invention provides a kind of monitoring system of oil storage tank leakage, including：
High-density electric subsystem, distributed optical fiber temperature measurement subsystem, distributive fiber optic strain sensing subsystem and data
Processing equipment；
Wherein, the high-density electric subsystem includes：Cable and parallel electrical prospecting apparatus；The parallel electrical prospecting apparatus respectively with
The electrode of the cable is connected with the data processing equipment；The cable is laid in the outside at the oil tank bottom；
The distributed optical fiber temperature measurement subsystem includes：Heat optical cable, heating power supply and DTS demodulated equipments；The heating
One end of optical cable is connect with the heating power supply, and the other end of the heating optical cable is connect with the DTS demodulated equipments；It is described
DTS demodulated equipments are also connect with the data processing equipment；The heating optical cable be laid in the outside at the oil tank bottom with
And on the inner wall of the oil storage tank；
The distributive fiber optic strain senses subsystem：Straining and sensing optical cable and optical fiber demodulating apparatus；The strain
Optical cable for sensing is connect with the optical fiber demodulating apparatus；The optical fiber demodulating apparatus is also connect with the data processing equipment.
Second aspect, the present invention provide a kind of monitoring method of oil storage tank leakage, are applied to such as any one of first aspect
The monitoring system, the method includes：
The apparent resistivity data of the electrode of the cable is acquired using the parallel electrical prospecting apparatus；
The temperature information of the heating cable is obtained using the DTS demodulated equipments；
The strain data of the straining and sensing optical cable is obtained using the optical fiber demodulating apparatus；
Using the data processing equipment according to the apparent resistivity data, the temperature information and the strain data,
Monitor the liquid level distribution situation and leak case of the oil storage tank.
The monitoring system and method for oil storage tank leakage provided by the invention, high-density electric subsystem, distribution type fiber-optic are surveyed
Warm subsystem, distributive fiber optic strain sensing subsystem and data processing equipment；Wherein, the high-density electric subsystem packet
It includes：Cable and parallel electrical prospecting apparatus；The parallel electrical prospecting apparatus respectively with the electrode of the cable and the data processing equipment
Connection；The cable is laid in the outside at the oil tank bottom；The distributed optical fiber temperature measurement subsystem includes：Heat light
Cable, heating power supply and DTS demodulated equipments；One end of the heating optical cable is connect with the heating power supply, the heating optical cable
The other end is connect with the DTS demodulated equipments；The DTS demodulated equipments are also connect with the data processing equipment；The heating
Optical cable is laid on the outside at the oil tank bottom and the inner wall of the oil storage tank；Distributive fiber optic strain sensing
System includes：Straining and sensing optical cable and optical fiber demodulating apparatus；The straining and sensing optical cable is connect with the optical fiber demodulating apparatus；Institute
It states optical fiber demodulating apparatus also to connect with the data processing equipment, passes through high-density electric subsystem, distributed optical fiber temperature measurement
System, distributive fiber optic strain sense subsystem, are carried out respectively from the angle of electric field, temperature field, stress field to entire oil storage tank
The monitoring of multi-angle, many reference amounts, monitoring result are more accurate.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.
Fig. 1 is the structure chart of one embodiment of monitoring system of oil storage tank provided in an embodiment of the present invention leakage；
Fig. 2 is the cable layout diagram of middle-high density electrical method subsystem of the embodiment of the present invention；
Fig. 3 is that " detour " type lays vertical view in the embodiment of the present invention；
Fig. 4 is that " spiral " type lays vertical view in the embodiment of the present invention；
Fig. 5 is clamp structure figure in the embodiment of the present invention；
Fig. 6 is protection sleeve pipe structure chart in the embodiment of the present invention；
Fig. 7 is that optical cable is heated in the embodiment of the present invention in oil storage tank inner-wall layout diagram；
Fig. 8 is storage box structure figure in the embodiment of the present invention；
Fig. 9 is the flow chart of one embodiment of monitoring method of oil storage tank provided in an embodiment of the present invention leakage.
Through the above attached drawings, it has been shown that the specific embodiment of the disclosure will be hereinafter described in more detail.These attached drawings
It is not intended to limit the scope of this disclosure concept by any means with verbal description, but is by referring to specific embodiments
Those skilled in the art illustrate the concept of the disclosure.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all implementations consistent with this disclosure.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.
It should be noted that in embodiments of the present invention, "upper", "lower", " side ", " top ", " bottom " are for indicating
The relative position of component is not that will describe component level or vertical orientation convenient for being described in conjunction with the accompanying embodiment.
In the related technology, whether following several monitoring methods have been leaked for tank bottom：
1, Sensor monitoring method is preset generally by temperature sensor, gas concentration detection sensor or pressure sensor
Whether revealed etc. being arranged between oil tank bottom or double layers of walls for monitoring tank bottom, but relevant sensor structure
More accurate, the survival time limit is not grown, and is difficult to repair use again and later maintenance cost is higher once going wrong；Meanwhile
Sensor arrangement limited amount is mostly point type distribution and in-site installation is more difficult, tank bottom can not be carried out full distributed be
System detection, the precise positioning of leakage point also have it is to be hoisted, it is even more impossible to the collected data of monitoring system institute that tank bottom is arranged into
Row processing, such as realize two dimension or three-dimensional visualization finely at figure.
2, the lossless leakage hidden danger monitoring method of metal include the detection of sound emission oil storage tank bottom plate, ultrasonic oil storage tank skin detection,
The detection of leakage field oil storage tank bottom plate, the detection of guided wave oil storage tank annular plate and robot detection etc..Wherein, ultrasound, leakage field, guided wave etc.
Detection is stopped production, is emptied, clean etc. and being detected to oil storage tank after processes, these methods are time-consuming and laborious, caused by economy damage
It loses huge and can not be detected in real time, be not suitable for the continuous on-line monitoring at scene.Robot monitoring method is to equipment
Safety, controllability, leakproofness etc. are more demanding, and monitoring cost is high, and reliability is relatively low, are still within explore rank at present
Section.
3, tank leaks oil-gas leaking monitoring method mainly by monitoring whether tank external environment gas concentration transfinites and let out to detect
Dew.Have at present and drill below tank bottom, the gas periodically extracted in drilling carries out content detection；Also have in the prior cloth of tank bottom
If the sensing equipments such as oil and gas detection sensor are detected the hydrocarbon content in underlying soil.But there is detection in these methods
Blind area, especially gas sensor sensitizing range are limited, it is more difficult to find leakage and the accurate positioning in initial stage and hidden region in time
It spends low.
4, in tank oil reserve loss leakage detection method be usually installed in oil storage tank level monitoring system or temperature,
The system elements such as electric resistance sensor.Wherein level monitoring system is complicated, difficult to install, easy is influenced by extraneous factor,
Guarantee is hardly resulted on accuracy, it is difficult to provide authentic communication whether leakage tank bottom that this, which allows for this method,；Temperature, electricity
It is mostly that point type is laid to hinder sensor etc., limited to the pinpoint ability of liquid level, sensitive can not discover the variable quantity for liquid level,
So can not just accurately calculate the liquid volume of oil storage tank leakage.
The above method cannot be satisfied reveals the demand that promptly and accurately monitors for tank bottom now, comprehensive, multi-angle, more
The three dimensions spread condition of the accurate leak point positioning of field many reference amounts and the acquisition leakage body of accurate quantification has been inexorable trend.
Distributed fibre optic sensing technology is quickly grown in recent years, and distribution, long range, high-precision, anticorrosion, anti-interference, structure is simple
Outstanding advantages of list is with being easy to lay makes this kind of technology be continuously available promotion and application in Practical Project monitoring；In addition, resistance
Rate imaging technique has many advantages, such as that at low cost, long lifespan, abundant information, explanation are convenient, and can carry out two dimension or three-dimensional visible
Chemical conversion figure, this technology are widely used to the fields such as environment, the hydrology, Geological Engineering.In the embodiment of the present invention, based on advanced
The difference that the Distributing Fiber Temperature Measuring System (DTS) of Raman diffused light time domain reflectometry (ROTDR) passes through temperature field
It is different liquid level in tank bottom leak point and tank to be monitored；By quasi-distributed optical fiber Bragg grating (FBG), full distributed cloth
In the monitoring technology such as deep optical time domain reflection (BOTDR) and Brillouin optical time domain analysis (BOTDA), can obtain automatically along whole light
The distribution situation of the information such as strain, temperature on fine length direction, can breakage changed to storage tank bottom plate stress field, crack etc.
Leakage point carries out precise positioning；Quasi-distributed 3 D resistivity, which is laid, in tank bottom tests system, it can be to certain below bottom plate
Electric field information in depth is monitored, and further can also be handled intuitively visualize to obtain at figure by three-dimensional and be revealed body
Space distribution situation.
Fig. 1 is the structure chart of one embodiment of monitoring system of oil storage tank provided in an embodiment of the present invention leakage.Such as Fig. 1 institutes
Show, the monitoring system of the oil storage tank leakage of the present embodiment includes：
High-density electric subsystem, distributed optical fiber temperature measurement subsystem, distributive fiber optic strain sensing subsystem and data
Processing equipment；
Wherein, the high-density electric subsystem includes：Cable and parallel electrical prospecting apparatus；The parallel electrical prospecting apparatus respectively with
The electrode of the cable is connected with the data processing equipment；The cable is laid in the outside at the oil tank bottom；
The distributed optical fiber temperature measurement subsystem includes：Heat optical cable, heating power supply and DTS demodulated equipments；The heating
One end of optical cable is connect with the heating power supply, and the other end of the heating optical cable is connect with the DTS demodulated equipments；It is described
DTS demodulated equipments are also connect with the data processing equipment；The heating optical cable be laid in the outside at the oil tank bottom with
And on the inner wall of the oil storage tank；
The distributive fiber optic strain senses subsystem：Straining and sensing optical cable and optical fiber demodulating apparatus；The strain
Optical cable for sensing is connect with the optical fiber demodulating apparatus；The optical fiber demodulating apparatus is also connect with the data processing equipment.
Specifically, high-density electric subsystem includes：Cable and parallel electrical prospecting apparatus；Wherein, parallel electrical prospecting apparatus respectively with
Cable is connected with data processing equipment.
Wherein, in practical applications, as shown in Fig. 2, cable 2 can be that (number of poles is only in figure with 64 electrodes 1
For example) cable, wherein electrode spacing can allow manufacturer to be customized according to actual needs, and the cable is physical prospecting
Private cable, for example, 34 cores, orange colour, electrode are pressing mold annulus tap (as being copper ring), and each adapter 3 is positive weldering
It connects, the adapter of the adapter of electrode (1~32), electrode (33~64) is performed into label, as the adapter of electrode (1~32) is
1, No. 2, the adapter of electrode (33~64) is 3, No. 4, and electrode tap point requires sealing waterproof；Parallel electrical prospecting apparatus and cable
Adapter connects.
The monitoring principle of the electrical method subsystem is as follows：
Cable according to certain rule lay in oil storage pot bottom and forms three-dimensional electrical method monitoring net, using parallel
Electrical prospecting apparatus is powered to form electric field to the three-dimensional electrical method observational network laid, and can detect preset below electrical method observational network
Electric field conditions in spatial depth medium, and then the leak area of resistivity anomaly can be obtained.The parallel electrical prospecting apparatus is by 64
The working condition of any electrode is set as a power supply positive (A), a power supply cathode (B), a public electrode (N) in a electrode,
Remaining is set as sample electrodes (M), therefore can collect mass data in a short time.The electrical method observational network can detect cable
Resistivity dynamic change situation in three dimensions below line.
Optionally, the cable is laid in the sand bedding course of the outside at the oil tank bottom；The sand bedding course is located at
The tar sand insulating layer lower part adjacent with the oil tank bottom.
Specifically, when tank area is built, the laying that tank base is carried out before oil storage tank is installed can be shifted to an earlier date, according to Oil Tank Farm Design
Specification, tank bottom are covered with tar sand insulating layer (such as not less than 100mm) and sand bedding course (being, for example, 300~600mm) successively,
Cable is laid on top in lower part, that is, sand bedding course of oil tank bottom tar sand insulating layer, from the angle of electric field to oil storage tank
The spread condition of the position and leakage body of leak point spatially carries out three-dimensional visualization monitoring.It is laid in tar sand insulating layer
Top in lower part, that is, sand bedding course is that grounding resistance is smaller and coupling is preferable because the electrode in the cable needs to be laid in
Region, however tar sand insulating layer electric conductivity is very poor, if laying the data acquisition that can seriously affect electrical method subsystem wherein
Quality, therefore it is preferably to select to be laid in the top in sand bedding course, and it is closer apart from tank bottom.
In some embodiments, the specific laying mode of cable be since tank bottom on one side in " detour " type lay
Until another side.
" detour " type groove is outputed in tank bottom region using notcher in sand bedding course, cable is laid with along slot, makes it
Uniform fold waits being backfilled and done compaction treatment appropriate after the completion of laying, to ensure electricity in the sand bedding course of entire tank bottom
Pole and sand bedding course have it is good contact, wherein electrode spacing, cable extension line length and " detour " are laid etc. according to actual feelings
Condition can carry out suitably adjusting and selecting.Cable is recommended to carry out the laying of " detour " type, because electrode is point type distribution, the laying side
Formula makes the position coordinates of each electrode be easy to determine.Wait for cable extension line after the completion of three-dimensional high-density electric method subsystem is laid and
Cable transferring head extends to ground and protection appropriate is carried out in extended line part.
Specific area, laying spacing etc. laid needs be adjusted according to practical tank bottom area, electrode spacing etc., but each electricity
Extremely accurate coordinate position need to make a record in advance, be used at figure so that the later stage establishes electrode coordinate and data.
Distributed optical fiber temperature measurement subsystem includes：Heat optical cable, heating power supply and DTS demodulated equipments；Wherein, DTS is demodulated
Equipment is connect with heating optical cable and data processing equipment respectively.
Optionally, heating optical cable is connect by signal transmission fiber with the DTS demodulated equipments.
Optionally, heating optical cable includes successively from inside to outside：Temperature sensing fibre, pine set carbon fiber wire and macromolecule shield
Set.
Wherein, temperature sensing fibre can be the single mode single temperature sensing fibre of 0.9mm diameters；The DTS demodulation is set
Standby to carry out distributed satellite systems based on Raman diffused light time domain reflectometry, temperature-sensing element is heating optical cable.
The outer layer of the heating optical cable is high polymer sheath, can improve the heating intensity of optical cable surrounding layer and corrosion-resistant
Property.
Wherein, by the mutual welding of heat-shrinkable T bush between temperature sensing fibre and signal transmission fiber, and in weld set
Equipped with continued access protection pipe, for protecting fusion point.
The monitoring principle of the distributed optical fiber temperature measurement subsystem is as follows：
Since the degree of energy transmission is different in different medium after heating optical cable heating so that in extended media shape
At temperature gradient it is different, and then measure the temperature gap that different temperature gradients or extended media are formed, sentenced with this
Liquid level in disconnected oil storage tank and tank bottom leak area.Be explained further for：Heating optical cable with interior heating function is powered
After fever, temperature increases, in oil and air or oil and two kinds of different mediums of soil, the speed degree of energy transmission and big
Small difference, temperature change is also inconsistent, the steady temperature field formed around the optical cable of certain time is heated by measurement, according to temperature
Degree Difference Gradient judges the liquid level in storage tank or tank bottom leak point in turn.
Further, it is possible to respectively arrange a set of heating optical cable, the angle pair from temperature field in oil storage tank inner-wall and tank bottom respectively
Oil storage tank leakage is monitored.
Optionally, heating optical cable is laid in by epoxy resin on the inner wall of the oil storage tank, alternatively, being laid by fixture
On the inner wall of the oil storage tank；The fixture is made of stainless steel.
It is as follows that the heating optical cable of oil storage tank inner-wall specifically lays mode：After oil storage tank installation fixes, oil storage tank is being crossed
Heating optical cable is tightly pasted on oil storage tank inner-wall along overall length with epoxy resin on the line that the section of central axes intersects with inner wall
It lays in U-typed, heating optical cable can be also fixed on by special fixture on oil storage tank inner-wall.As shown in figure 5, including fixture master slice
6 and fixture public affairs piece 7, there is anchor hole 4 and screw fixing hole 5 on fixture master slice 6, there is screw fixing hole 8 on fixture public affairs piece 7.
Wherein, the laying distance between fixture needs to reasonably select.The anchoring pieces such as flat head screw, nut used in the fixture and stationary fixture
It is stainless steel, the heat conductivility for having no effect on heating optical cable can be used for a long time.Wherein, heating needs between optical cable and fixture
It is protected with protection sleeve pipe, that is, heats cable jacket and be equipped with protection sleeve pipe 9, as shown in Figure 6.Make heating optical cable not by metal fixture
Damage.The protection sleeve pipe that the heating cable jacket is set can be PVC material.No matter using which kind of system of laying be both needed to by
It is stretched along heating optical cable.Extra part can be extended to from top ends of cans or hole after the completion of fiber cable laying to be heated
Outside oil storage tank, and it is coiling in parcel tray.Wherein, top ends of cans position need to reserve an osculum or in tank deck adjacent sidewalls
An aperture is opened, aperture size only needs that the normal work that optical cable 10 passes through and do not influence late stage reservoir tank will be heated.Institute
The parcel tray 11 stated is stainless steel, is used to store the heating optical cable extended to outside storage tank, as shown in fig. 7, storage case cover
Can there are a notches, and be reserved with a leakage hole in the bottom of parcel tray, it is remaining in parcel tray convenient for timely excluding
Rainwater etc., the drying for keeping it internal.
Optionally, the heating optical cable is laid in the tar sand of the outside at the oil tank bottom in detour type or screw type
In insulating layer.
Specifically, specifically to lay mode as follows for the heating optical cable at oil tank bottom：For actual monitoring demand and condition
Difference, the embodiment of the present invention can provide two kinds of laying forms, (1) as shown in figure 3, using fluting in tar sand insulating layer
Device outputs " detour " type groove in tank bottom region, and heating optical cable is laid with along slot, makes its uniform fold in the pitch of entire tank bottom
In insulating layer, wait being backfilled and being compacted after the completion of laying.(2) as shown in figure 4, being existed using notcher in tar sand insulating layer
Tank bottom outputs " spiral " type groove in region, heating optical cable is laid with along slot, makes its uniform fold in the bitumen insulation of entire tank bottom
In layer, wait being backfilled and being compacted after the completion of laying.Which kind of no matter it is required to rationally be selected according to actual conditions using laying form
Select, while also to measure the length and the parameters such as specific installation position for recording that heating optical cable is laid, in case later data at
It is used when figure and analysis interpretation.
In some embodiments, after the completion of three-dimensional high-density electric method subsystem is laid, you can be laid with drip at an upper portion thereof
Green sand insulating layer is outputed " detour " or " spiral " type groove using notcher in tar sand insulating layer in tank bottom region, will be added
Hot optical cable is laid with along slot, makes its uniform fold in the tar sand insulating layer of entire tank bottom, waits being backfilled simultaneously after the completion of laying
Compacting.
Wherein, heating optical cable crooked position can not be rolled over, and adjustment that can be cambered is impaired to prevent inside.Wherein, it is laid with
To being because heating optical cable does not need to have good conductive medium around it in tar sand insulating layer, and the layer is apart from tank
Bottom is nearest, is backfilled and is compacted after only need to being laid in it in tar sand insulating layer certain level face according to certain regular uniform
Afterwards, you can position is revealed to tank bottom in the monitoring in later stage and range is precisely judged.Finally, extra heating optical cable is prolonged
Mutual welding between ground and signal transmission fiber is extended to, continued access is used in combination to protect protection of pipe fusion point, wherein heating optical cable extends
Section need to make suitable protecting.
It includes straining and sensing optical cable and optical fiber demodulating apparatus that distributive fiber optic strain, which senses subsystem,；Optical fiber demodulating apparatus point
It is not connect with straining and sensing optical cable and data processing equipment.
Optionally, the straining and sensing optical cable is connect by signal transmission fiber with the optical fiber demodulating apparatus.
Wherein, by the mutual welding of heat-shrinkable T bush between straining and sensing optical cable and signal transmission fiber, and in weld set
Equipped with continued access protection pipe, for protecting fusion point.
Wherein, straining and sensing optical cable can be the tight sleeve optic cable of the single mode single tightly packaged fiber of internal core diameter 0.9mm,
It is strong to the sensing capability of small strain；The optical fiber demodulating apparatus can be BOTDA (FBG) demodulators or BOTDR (FBG) demodulators；Institute
The both ends that BOTDA (FBG) demodulators need while connecting straining and sensing optical cable are stated, data acquire spatial resolution height, but are wanted to the external world
Ask harsher；The BOTDR (FBG) demodulators only need connection straining and sensing optical cable one end that can be acquired to data, space
Resolution ratio is higher, is more suitable for complicated external condition.
It is as follows that the distributive fiber optic strain senses subsystem monitoring principle：Since distributed strain optical cable for sensing is uniformly pasted
It is laid on the outer wall of tank bottom that (straining and sensing optical cable need to be pasted and is fixed on storage tank bottom plate in advance, that is, be fixed on the outer wall of tank bottom
On), when the tank bottom leakage accident such as occur that rupture or corroded, the straining and sensing optical cable of corresponding position can stress variation to
So that the propagation path of light is changed, obtain the drift value of backward Brillouin scattering light frequency, according to Brillouin shift and strain
Linear relationship between optical cable for sensing strain obtains straining magnitude at tank bottom leakage point position, and then determines and reveal accurate position
It sets, range and force-bearing situation, realizes the accurate monitoring of oil tank bottom leak point.
Optionally, the straining and sensing optical cable is laid in the oil tank by epoxy resin in detour type or screw type
Bottom.
For actual monitoring demand and the difference of condition, the embodiment of the present invention provides two kinds of laying forms, (1) straining and sensing
Optical cable, which is tightly pasted along overall length with epoxy resin, to be laid at oil tank bottom in " detour " type.This laying form allows straining and sensing
The head and the tail Duan Junneng of optical cable is extended to outside oil tank bottom, and it is logical can to will extend into the straining and sensing optical cable head and the tail both ends outside oil storage tank
It crosses signal transmission fiber and is connected to progress data acquisition on BOTDA (FBG) demodulators, also can only connect one end by signal transmission fiber
It is connected to progress data acquisition on BOTDR (FBG) demodulators；(2) straining and sensing optical cable is tightly pasted with epoxy resin in oil storage tank along overall length
Tank bottom is laid in " spiral " type, and this laying form is more suitable for extending to the tail end of optical fiber outside storage tank, passes through signal transmission
Optical fiber is connect with BOTDR (FBG) demodulators carries out data acquisition.For distributed strain optical cable for sensing, the portion outside tank bottom can be will extend into
Component of strain optical cable for sensing is coiled in special trepanning depository dish, and is embedded near tank bottom, such as the light of 5m long can be arranged
Cable redundant segments are accurately positioned and temperature self-compensation with playing a dual role of straining and sensing optical cable.No matter using which kind of laying shape
Formula is required to be reasonably selected according to actual conditions, while straining and sensing optical cable being pasted and has to apply a certain size in tank bottom
Prestressing force, so that straining and sensing optical cable is had certain initial strain, and at the same time also to measure recorded straining and sensing optical cable apply
If length and the parameters such as specific position, used when in case later data is at figure and analysis interpretation.
Optionally, as shown in figure 8, having notch 12, box cover to pass through cover shaft 14 and box on the box cover of trepanning depository dish
Body connects, and is fixed by lock 13.Box cover bottom has water-filtering net 15, and trepanning depository dish can be plastic casing.
Above-mentioned multiple subsystems have carried out full side from electric field, temperature field, stress field to oil storage tank bottom plate leak case respectively
Position, multi-angle, multi-level visualizing monitor.The monitoring system that the embodiment of the present invention is proposed is carried out in top tank structure and tank bottom
It lays, is a kind of monitoring system of the combination of inner and outside.
Further, to integrally laying the specific execute-in-place of each subsystem that installation is complete, data acquire and processing
The problems such as described.
Big the end of a thread of cable is attached according to label with the connector of corresponding parallel electrical prospecting apparatus, while being connected simultaneously
Power cord in row electrical prospecting apparatus and connection open the acquisition that the acquisition software in parallel electrical prospecting apparatus carries out apparent resistivity data.
Wherein, the voltage of parallel electrical prospecting apparatus for example has 24V, 48V, 72V, 96V fourth gear adjustable；Parallel electrical prospecting apparatus according to supply terminals not
Together, data acquisition modes are divided into two kinds of AM methods and ABM methods, and acquisition parameter is according to depending on on-the-spot test condition, in general, AM methods are set
Setting parameter is：Constant current time 0.5s, sampling time interval 0.05s, ABM method arrange parameter are：Constant current time 0.2s, sampling time
It is spaced 0.1s.Wherein the collected data volume of AM methods includes the data of a variety of type of device, such as the extremely device number of two poles, three
Include the data of a variety of type of device according to, the collected data volume of ABM methods, such as winner quadrupole, winner dipole, winner derivator
Data.Therefore, electrical method of network concurrency instrument can collect the data of magnanimity in a short time, also, we can be according to need
The apparent resistivity data of related device type is arbitrarily extracted, meanwhile, it can be by AGI isoinversion software to apparent resistivity number
According to progress inversion procedure.Finally, using Become the picture softwares such as Surfer handle at figure.
Heating optical cable connect with heating power supply, signal transmission fiber respectively, DTS demodulated equipments and signal transmission fiber,
Data processing equipment (for example, computer with Data Analysis Software) connection, connecting heating power supply makes heating optical cable in electric current
It is started to warm up under effect, with the temperature information during the demodulation of DTS demodulated equipments, record heating optical cable electrified regulation, uses number
It carries out being processed into figure according to processing equipment.Selection in the embodiment of the present invention between temperature gradient zone depends on the fever work(of heating optical cable
Rate, the macroscopic property of measurement object and measurement accuracy can be debugged determination by calibration test.Test result shows：It is logical
Electrical heating voltage 220V/30m, power 65-105W/30m (refer to the thermal power of every 30 meters of heating optical cable in 65-105W ranges), i.e.,
Apparent temperature gradient can be formed.The data processing equipment be full automatic treatment, heat optical cable data acquisition time and
Length interval can require artificial or automatic setting according to measurement accuracy.General measure time interval 1 minute, length interval 0.1-
0.5 meter is advisable, and in real time or is periodically converted to the temperature information that demodulated equipment demodulates by exclusive data processing software
Oil-water fluid bit distribution information, and by result drafting pattern.
Straining and sensing optical cable is connected to BOTDA or BOTDR (FBG) demodulators, the wherein sky of (FBG) demodulator by signal transmission fiber
Between resolution ratio and sampling interval be respectively set to 5cm and 1cm.After rupture or deformation occur for certain position in oil storage tank bottom plate,
The distributed strain optical cable for sensing pasted on bottom plate can strain, which will make the cloth on distributed strain optical cable for sensing
In deep pool scattering light frequency drift about, (FBG) demodulator can measure the dependent variable in real time, to obtain storage tank bottom plate Strain Distribution feelings
Condition.In order to eliminate error present in DATA REASONING or jump point, measured strain data is put down using the method for moving average
Sliding processing, then using MATLAB to monitoring obtained strain data into row interpolation, and at the strain cloud atlas for going out oil storage tank bottom plate.
Cloud atlas situation of change is strained by the bottom plate that comparative analysis obtains each time or front and back data are carried out at corresponding difference
After reason, the security situation of storage tank bottom plate can accurately be monitored.
The present embodiment oil storage tank leakage monitoring system, high-density electric subsystem, distributed optical fiber temperature measurement subsystem,
Distributive fiber optic strain senses subsystem and data processing equipment；Wherein, the high-density electric subsystem includes：Cable and
Parallel electrical prospecting apparatus；The parallel electrical prospecting apparatus is connect with the electrode of the cable and the data processing equipment respectively；The electricity
Cable is laid in the outside at the oil tank bottom；The distributed optical fiber temperature measurement subsystem includes：Heat optical cable, heating power supply
With DTS demodulated equipments；It is described heating optical cable one end connect with the heating power supply, it is described heat optical cable the other end with it is described
DTS demodulated equipments connect；The DTS demodulated equipments are also connect with the data processing equipment；The heating optical cable is laid in institute
It states on the outside at oil tank bottom and the inner wall of the oil storage tank；The distributive fiber optic strain senses subsystem：It answers
Become optical cable for sensing and optical fiber demodulating apparatus；The straining and sensing optical cable is connect with the optical fiber demodulating apparatus；The optical fibre interrogation
Equipment is also connect with the data processing equipment, passes through high-density electric subsystem, distributed optical fiber temperature measurement subsystem, distribution
Fibre strain senses subsystem, has carried out multi-angle, more to entire oil storage tank from the angle of stress field, temperature field, electric field respectively
The monitoring of parameter, monitoring result are more accurate.
Fig. 9 is the flow chart of one embodiment of monitoring method of oil storage tank provided in an embodiment of the present invention leakage.Such as Fig. 9 institutes
Show, present invention method, is applied to the monitoring system of previous embodiment, the method includes：
Step 901, acquired using the parallel electrical prospecting apparatus cable electrode apparent resistivity data；
Step 902, the temperature information that the heating optical cable is obtained using the DTS demodulated equipments；
Step 903, the strain data that the straining and sensing optical cable is obtained using the optical fiber demodulating apparatus；
Step 904 according to the apparent resistivity data, the temperature information and described is answered using the data processing equipment
Become data, monitors the liquid level distribution situation and leak case of the oil storage tank.
The method of the present embodiment, realization principle and technique effect are similar with the monitoring system of previous embodiment, herein not
It repeats again.
The advantages of monitoring method of the embodiment of the present invention：First, the more many reference amounts monitoring that the embodiment of the present invention is proposed
System is laid in top tank structure and tank bottom, is a kind of monitoring system of the combination of inner and outside.The monitoring system that top tank structure is laid
System can precisely perceive the variation of liquid level from the angle in temperature field, and the monitoring system that tank bottom is laid is from stress field, temperature field, electric field
Angle to tank bottom leakage point, leakage range and reveal body diffusion path spatially and precisely perceived, two peacekeepings of formation
Three-dimensional visualization result figure.Comprehensive, multi-angle, multi-level, many reference amounts, three-dimensional have been carried out to entire oil storage tank and in real time may be used
Depending on the accurate monitoring of change.
Secondly, the monitoring simple installation, simple in structure, corrosion-resistant, safety economy can incite somebody to action while tank area is built
The system, which is once laid, to be completed to carry out to monitor up to long-term, stable, the repetition of decades, has distribution in terms of data acquisition
Formula, many reference amounts, can acquire mass data at high-precision in the short time, data can carry out two and three dimensions visualization at figure aspect
Automatic mapping, and anomalous body spatial distribution can be extracted, while can in real time, dynamically monitor the change in time and space feelings of leakage accident
Condition.
Finally, the Application of Monitoring System field is wide, is applicable not only to petrochemical industry, the large-scale single layer of petroleum industry or the double-deck storage
The leakage monitoring at oil tank bottom can also be applied in other all tank bottom leakage monitorings with mobility medium, fit
It is strong with property.Meanwhile a set of monitoring device can be used for a certain region or multiple of the monitoring system to having laid the more many reference amounts
Storage tank bottom plate in region is monitored, the further utilization rate and use value for improving monitoring device.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
Its embodiment.The present invention is directed to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and includes the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by following
Claims are pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by appended claims
System.
Claims (10)
1. a kind of monitoring system of oil storage tank leakage, which is characterized in that including：
High-density electric subsystem, distributed optical fiber temperature measurement subsystem, distributive fiber optic strain sensing subsystem and data processing
Equipment；
Wherein, the high-density electric subsystem includes：Cable and parallel electrical prospecting apparatus；The parallel electrical prospecting apparatus respectively with it is described
The electrode of cable is connected with the data processing equipment；The cable is laid in the outside at the oil tank bottom；
The distributed optical fiber temperature measurement subsystem includes：Heat optical cable, heating power supply and DTS demodulated equipments；The heating optical cable
One end connect with the heating power supply, it is described heating optical cable the other end connect with the DTS demodulated equipments；The DTS solutions
Equipment is adjusted also to be connect with the data processing equipment；The heating optical cable is laid in the outside at the oil tank bottom and described
On the inner wall of oil storage tank；
The distributive fiber optic strain senses subsystem：Straining and sensing optical cable and optical fiber demodulating apparatus；The straining and sensing
Optical cable is connect with the optical fiber demodulating apparatus；The optical fiber demodulating apparatus is also connect with the data processing equipment.
2. system according to claim 1, which is characterized in that the electrode of the cable includes：Power supply anode, power supply are negative
Pole, public electrode and at least one sample electrodes.
3. system according to claim 1 or 2, which is characterized in that the cable is laid in the oil tank bottom
In external sand bedding course；The sand bedding course is located at the tar sand insulating layer lower part adjacent with the oil tank bottom.
4. system according to claim 1 or 2, which is characterized in that the other end of the heating optical cable passes through signal transmission
Optical fiber is connect with the DTS demodulated equipments；The straining and sensing optical cable passes through signal transmission fiber and the optical fiber demodulating apparatus
Connection.
5. system according to claim 4, which is characterized in that the heating optical cable includes successively from inside to outside：Temperature sense
Survey optical fiber, pine set carbon fiber wire and high polymer sheath.
6. system according to claim 5, which is characterized in that
The temperature sensing fibre and the signal transmission fiber pass through heat-shrinkable T bush welding；The temperature sensing fibre and described
Signal transmission fiber is arranged with continued access protection pipe in weld.
7. system according to claim 1 or 2, which is characterized in that
The heating optical cable is laid in by epoxy resin on the inner wall of the oil storage tank, alternatively, being laid in by fixture described
On the inner wall of oil storage tank；The fixture is made of stainless steel.
8. system according to claim 1 or 2, which is characterized in that the heating optical cable is laid in detour type or screw type
In the tar sand insulating layer of the outside at the oil tank bottom.
9. system according to claim 1 or 2, which is characterized in that
The straining and sensing optical cable is laid in detour type or screw type on the outer wall at the oil tank bottom by epoxy resin.
10. a kind of monitoring method of oil storage tank leakage, which is characterized in that be applied to claim 1-9 any one of them such as and supervise
Examining system, the method includes：
The apparent resistivity data of the electrode of the cable is acquired using the parallel electrical prospecting apparatus；
The temperature information of the heating optical cable is obtained using the DTS demodulated equipments；
The strain data of the straining and sensing optical cable is obtained using the optical fiber demodulating apparatus；
Using the data processing equipment according to the apparent resistivity data, the temperature information and the strain data, monitoring
The liquid level distribution situation and leak case of the oil storage tank.
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