CN110342130A - A kind of system of the array distributed monitoring fused salt storage tank leakage of thinning FBG - Google Patents
A kind of system of the array distributed monitoring fused salt storage tank leakage of thinning FBG Download PDFInfo
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- CN110342130A CN110342130A CN201910580048.7A CN201910580048A CN110342130A CN 110342130 A CN110342130 A CN 110342130A CN 201910580048 A CN201910580048 A CN 201910580048A CN 110342130 A CN110342130 A CN 110342130A
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- fbg
- thinning
- fused salt
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- storage tank
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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
- B65D90/02—Wall construction
-
- 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
- B65D90/51—Arrangements of indicating or measuring devices of leakage-indicating devices characterised by sensors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Examining Or Testing Airtightness (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a kind of systems of thinning array distributed monitoring fused salt storage tank leakage of FBG, including wideband light source, thinning FBG array to conciliate sub-system；Gratings in series is on metal coated fiber resistant to high temperature, form sensing element FBG array, thinning FBG array is arranged in fused salt pot sidewall and basis, the wide spectrum optical that wide spectrum light source issues is incident on thinning FBG array by circulator, the optical signal of reflection is converted to electric signal through photoelectric receiving tube, and signal is acquired using signal conditioning circuit and data collecting card, handle and is amplified, reflected light energy variation caused by evanscent field changes is detected by energy meter simultaneously, forms the array distributed monitoring system of thinning FBG of fused salt storage tank leakage.It is the fused salt storage tank linkage monitoring network of transport vehicle, distributed measurement storage tank ambient temperature and refractive index by sensing element, high-temperature resistant optical fiber of concatenated Bragg grating, in time, accurately and rapidly finds and position high temperature tank leak problem.
Description
Technical field
The present invention relates to the leakage monitoring technical fields of high temperature storage tank, array distributed more particularly, to a kind of thinning FBG
The system for monitoring fused salt storage tank leakage.
Background technique
In the application of solar energy, solar energy heat-storage generation technology has better schedulable potentiality, be it is a kind of it is non-often with
There is the renewable energy utilization mode of development potentiality.In solar energy thermal-power-generating technology, need thermal energy storage device, solar energy not
The thermal energy of storage is released to meet power generation needs when sufficient, plays the role of power buffering and peak load shifting.Double-pot type is molten
The indirect heat reservoir of salt is most common heat accumulation form in Columnating type solar power generation, and fused salt is high with temperature, quality is big, welding
Place is easy to happen the characteristics of leakage.When fused salt leaks, insulating layer on the outside of storage tank can be not only polluted, a large amount of leakages can also penetrate into
Ground and soil, or even the safety in entire power station is impacted.Therefore, in the design and use of fused salt storage tank, one is formulated
A system that can monitor fused salt leakage on-line is extremely important.
Why the leakage monitoring of fused salt tank becomes international problem, mainly due to photo-thermal power plant fused salt storage tank tank body
Greatly, floor space is big.Fused-salt medium temperature is high (up to 560 DEG C), and temperature distribution is non-uniform in storage tank for fused-salt medium, this
The presence meeting of a little characteristics is so that the thermal expansion of fused salt storage tank body different location is different, so that tank body be made to bear huge stress, Yi Zao
It is deformed at tank body, and then causes to rupture the leakage accident for causing fused salt tank.
Current adoptable monitoring means is the method by thermocouple temperature measurement, a pre-buried fixed number in the basis of fused salt tank
The thermocouple of amount, is connected to outside basis by thermocouple wire, by cable thereto, is ultimately connected to DCS control system.
However, being limited to cost and the numerous thermocouple of installation number can be extremely difficult in basis, and it is possible to underlying strength
Impacted with heat dissipation, the installable quantity of measuring point is very limited, a fused salt tank base can only often be uniformly distributed tens to
Up to a hundred thermocouples are higher than more than 1000 m up to 40m, floor space for diameter2Fused salt tank, an average thermocouple needs to monitor
Area to reach more than ten square metres, and thermocouple can only realize the measurement of some specific point position temperature, unless leakage point is just
For benefit near the top of thermocouple, thermocouple can just monitor temperature change.Therefore, it is impossible to realize to entire fused salt tank base
Ideal effect is not achieved in the good covering of temperature measurement, the method for only relying on pre-buried thermocouple monitoring.
FBG as a kind of superior sensing element on the one hand there is corrosion-resistant, electromagnetism interference, small in size, easy networking to pass
The center reflection wavelength of the advantages that defeated, another aspect FBG have sensitive characteristic to parameters such as temperature, strain, refractive index.FBG
Sensor can be easy to be together in series, and form optical fiber optical grating array, and an optical fiber multimetering constitutes distributed monitoring system
System judges the point with the presence or absence of leakage by observing the reflection center wavelength of light drift value of each point.
Summary of the invention
The invention aims to provide a kind of system of array distributed monitoring fused salt storage tank leakage of thinning FBG, it is used for
Continuity, the measurement that whether monitoring fused salt storage tank leaks on a large scale, overcome conventional thermocouple thermometric that can only survey some point
Or the defect of certain several temperature.
To achieve the goals above, the invention provides the following technical scheme:
A kind of system of the array distributed monitoring fused salt storage tank leakage of thinning FBG, including wideband light source, thinning FBG array
Conciliate sub-system；
The wide spectrum optical that wideband light source issues is incident on thinning FBG array；
The thinning FBG array includes concatenated FBG optical sensor, is arranged in fused salt pot sidewall and bottom base
In plinth；
The solution sub-system includes: the energy meter for acquiring the reflected energy of the thinning FBG array, acquires the change
The signal pickup assembly of the optical signal of thin FBG array reflection, and to the electric signal of signal pickup assembly output at
The computer of reason.
In the present invention, FBG optical sensor arrangement is utilized respectively energy meter and obtains FBG in fused salt pot sidewall and basis
Reflected energy and signal pickup assembly collect FBG reflected light signal, ring is judged by the variation of evanscent field and reflected energy
The variation of border refractive index forms the array distributed monitoring system of thinning FBG of fused salt storage tank leakage.
Preferably, the wide spectrum optical that the wideband light source issues is incident on thinning FBG array by a circulator, by described
The light of thinning FBG array reflection enters solution sub-system through the circulator.
Preferably, the solution sub-system includes the coupler connecting with the circulator；It is emitted by the coupler
Light be divided into two-way, all the way enter the energy meter, another way enter the signal pickup assembly.
It is further preferred that the signal pickup assembly includes sequentially connected wavelength division multiplexer, photoelectric receiving tube, letter
Number conditioning circuit and data collecting card；Wavelength division multiplexer demodulates optical signal, demodulates the optical signal of acquisition through opto-electronic receiver
Pipe is converted to electric signal, and is acquired, handles and is amplified to signal using signal conditioning circuit and data collecting card, and output is extremely
Computer is handled.
Solution sub-system is the method based on wavelength-division multiplex demodulation Bragg grating wavelength, will all the way by wavelength division multiplexer
Optical signal is divided into multichannel on wavelength domain, reconciles the reflective Bragg optical signal of multichannel Bragg grating, wavelength division multiplexer and
Different wavelength signals are demodulated into electric signal by photoelectric receiving tube, by computer LabVIEW data processing software to electric signal
Post-processing, interface real-time display monitoring data are carried out, and abnormal alarm is set.
Preferably, the FBG optical sensor arrangement is in the first layer close to the fused salt pot sidewall and base foundation
In insulating layer or thermal insulation layer.The FBG optical sensor includes the fibre core with metal coating, is located at Bradley in the fibre core
Lattice grating, the silicone resin inner cladding and stainless steel cloth surrounding layer being wrapped in outside metal coating；Lead at the Bragg grating
Excessive erosion keeps inner cladding thinning or is corroded completely.
FBG optical sensor records the corresponding relationship of fiber grating absolute growth Yu fused salt tank position in arrangement, such as
Fused salt leakage occurs for fruit, and the liquid fused salt of high temperature flows through stainless steel cloth covering and reaches at inner cladding, will lead to temperature on the outside of grating
The raising of degree and refractive index causes central wavelength drift and reflected light energy to reduce；If fused salt solidifies around measuring point, survey
Point ambient temperature increases, and central wavelength can also be caused to be drifted about, and can quickly and accurately find fused salt tank leakage with this and determine leakage
The position of point.
Preferably, in the first layer insulating layer outside the fused salt pot sidewall, the FBG optical sensor is twined by spiral
Around mode connect.In the first layer thermal insulation layer of the fused salt tank base foundation, the FBG optical sensor is according to plane spiral shell
The mode arranged in series of rotation.
Fused salt tank outside wall temperature is close with temperature of molten salt in tank, directly measures outside wall temperature and is not easy to determine whether fused salt tank is sent out
Raw leakage, and high temperature can reduce the service life of sensing element, therefore fused salt pot sidewall temperature-measuring optical fiber grating is twined using spiral
Around mode, be arranged in outside tank body wall surface in first time insulating layer.The fused salt tank base foundation uses multilayer insulation material
It is kept the temperature and is consolidated, by distributed thinning FBG screw arrangement in bottom first layer heat-barrier material.Described thinning FBG gusts
The grating space and fiber spiral line height of column, the determination for enclosing number, should want according to tank body actual size and leakage monitoring sensitivity
It asks and comprehensively considers.
Beneficial effect by fused salt storage tank side wall and the thermometric of bottom and surveys folding using optical fiber as the above scheme is adopted
The gratings in series of rate is penetrated, the fiber grating fused salt tank linkage monitoring network that FBG in a distributed manner is sensed as means is formed.Utilize winding
Thinning fiber bragg grating on the outside of tank body realizes the detection and positioning of fused salt leakage as sensing element.When grating institute
When fused salt tank skin in region leaks, silicon carbide locating for grating and refractive index are increased, it will lead to the anti-of fiber grating
Hit that cardiac wave is long to drift about and reflected light energy reduction.FBG temperature sensing and FBG evanscent field refractive index sensing are examined simultaneously
Survey, enhance the susceptibility of system detection, realize fused salt storage tank leakage it is accurate, timely monitor.
Present invention firstly provides the array distributed monitoring system of thinning FBG of fused salt leakage, thinning FBG sensing to temperature and
Refractive index has sensitive characteristic, and FBG uses concatenated mode, and an optical fiber multimetering constitutes distributed sensing array, leads to
The reflection center wavelength of light drift value for observing each point and reflected light energy are crossed to judge that the point with the presence or absence of leakage, improves molten
The real-time and accuracy of salt tank leak monitoring.Also, the optical fiber that the present invention utilizes is metal coated fiber, and metal coats light
Fibre can work normally under up to 600 DEG C of environment, and the thermal expansion coefficient and optical fiber of metal coating have very in same order
Well anticorrosive, endurance and compression resistance performance；The oversheath of metal optical fiber uses stainless steel cloth, fused salt energy seepage flow to interior packet
Layer, and can effectively enhance proof stress impact property.System to fused salt storage tank comprehensively and actively monitoring, find fused salt tank in time
Leakage problem, and quick, accurate positionin, operation safe and effective to heat reservoir have far-reaching influence.
Detailed description of the invention
Fig. 1 is system construction drawing of the invention.
Fig. 2 is fused salt tank body and its insulation construction figure of the invention.
Fig. 3 is thinning FBG structure figure of the invention.
Fig. 4 is fused salt storage tank side fiber grating layout drawing of the invention.
Fig. 5 is fused salt storage tank bottom fiber grating layout drawing of the invention.
In figure, 1, fused salt tank ontology；2, tank body insulating layer；3, first layer basis heat-barrier material；4, second layer basis is heat-insulated
Material；5, refractory brick；6, thinning FBG array；7, optical fibers coated with metal；8, silicone resin inner cladding；9, grating and thinning covering；
10, stainless steel cloth.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be described in detail, but the present invention is not limited to this.
As shown in Figure 1, a kind of system of the array distributed monitoring fused salt storage tank leakage of thinning FBG, including wideband light source, change
Thin FBG array conciliates sub-system.The wide spectrum optical that wide spectrum light source issues in above-mentioned monitoring system is incident on change by circulator
Thin FBG array, optical fiber optical grating array are arranged in fused salt pot sidewall and basis, and the light for meeting Bragg condition will be reflected back toward
Then circulator is sent into wavelength division multiplexer all the way and is demodulated, the optical signal for demodulating acquisition is converted to telecommunications through photoelectric receiving tube
Number, and signal is acquired, handle and is amplified using signal conditioning circuit and data collecting card, another way is obtained using energy meter
The reflected energy for taking FBG judges the variation of ambient refractive index by the variation of evanscent field and reflected energy, forms fused salt storage tank and lets out
The array distributed monitoring system of thinning FBG of leakage.
Solution sub-system is the method based on wavelength-division multiplex demodulation Bragg grating wavelength, will all the way by wavelength division multiplexer
Optical signal is divided into multichannel on wavelength domain, reconciles the reflective Bragg optical signal of multichannel Bragg grating, wavelength division multiplexer and
Different wavelength signals are demodulated into electric signal by photoelectric receiving tube, by computer LabVIEW data processing software to electric signal
Post-processing, interface real-time display monitoring data are carried out, and abnormal alarm is set.
In fused salt tank body as shown in Figure 2 and its insulation construction, fused salt is close in the temperature and tank of fused salt tank wall 1, directly
It connects measurement outside wall temperature to be not easy to determine whether fused salt tank leaks, and high temperature can reduce the service life of sensing element, because
Thinning FBG array 6 is arranged in outside tank body wall surface in first time insulating layer 2 by the way of spiral winding in this fused salt pot sidewall.
The fused salt tank base foundation is kept the temperature and is consolidated using multilayer insulation material 3 and 4, by thinning 6 screw arrangement of FBG array
In bottom first layer heat-barrier material 3.
Thinning FBG array includes concatenated multiple FBG optical sensors.As shown in figure 3, in each FBG optical sensor, gold
Belong to and is surrounded by silicone resin inner cladding 8 on the outside of coated fiber 7, it is thinning using hydrofluoric acid corrosion covering 8 at grating, form sensing element
9, stainless steel cloth surrounding layer 10 is coated on the outside of inner cladding 8.Multiple Grating examinations points form array, and each grating is corresponding in array
The central wavelength value of one reflected light, detects with this and positions the leakage of fused salt.
Fig. 4 is fused salt storage tank side fiber grating layout drawing, and thinning FBG array 6 is arranged by the way of helical wound.
Fig. 5 is fused salt storage tank bottom fiber grating layout drawing, and thinning FBG array 6 is arranged in such a way that spiral is uniformly distributed.Bragg grating
Spacing (or spacing of FBG optical sensor) and fiber spiral line height, the determination for enclosing number, according to tank body actual size and should let out
Leakage monitoring sensitivity requires to comprehensively consider.
Thinning FBG array records the corresponding relationship of fiber grating absolute growth Yu fused salt tank position in arrangement, if
Fused salt leakage occurs, the liquid fused salt of high temperature flows through stainless steel cloth covering and reaches at inner cladding, will lead to grating temperature outside
With the raising of refractive index, central wavelength drift and reflected light energy is caused to reduce；If fused salt solidifies around measuring point, measuring point
Ambient temperature increases, and can also central wavelength be caused to be drifted about, quickly and accurately can be found and be determined the position of leakage point with this.
The foregoing is merely preferable implementation examples of the invention, are not intended to restrict the invention, it is all in spirit of that invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of system of the array distributed monitoring fused salt storage tank leakage of thinning FBG, which is characterized in that including wideband light source, become
Thin FBG array conciliates sub-system；
The wide spectrum optical that wideband light source issues is incident on thinning FBG array；
The thinning FBG array includes concatenated FBG optical sensor, is arranged in fused salt pot sidewall and base foundation
In；
The solution sub-system includes: the energy meter for acquiring the reflected energy of the thinning FBG array, is acquired described thinning
The signal pickup assembly of the optical signal of FBG array reflection, and the electric signal of signal pickup assembly output is handled
Computer.
2. the system of the array distributed monitoring fused salt storage tank leakage of thinning FBG as described in claim 1, which is characterized in that institute
The wide spectrum optical that the wideband light source stated issues is incident on thinning FBG array by a circulator, by the thinning FBG array reflection
Light enters solution sub-system through the circulator.
3. the system of the array distributed monitoring fused salt storage tank leakage of thinning FBG as claimed in claim 2, which is characterized in that institute
The solution sub-system stated includes the coupler connecting with the circulator；
Two-way is divided by the light that the coupler is emitted, enters the energy meter all the way, another way enters the signal and adopts
Acquisition means.
4. the system of the array distributed monitoring fused salt storage tank leakage of thinning FBG as described in claim 1, which is characterized in that institute
The signal pickup assembly stated includes sequentially connected wavelength division multiplexer, photoelectric receiving tube, signal conditioning circuit and data collecting card；
Wavelength division multiplexer demodulates optical signal, and the optical signal for demodulating acquisition is converted to electric signal through photoelectric receiving tube, and uses letter
Number conditioning circuit and data collecting card are acquired signal, handle and amplify, and output to computer is handled.
5. the system of the array distributed monitoring fused salt storage tank leakage of thinning FBG as described in claim 1, which is characterized in that institute
The FBG optical sensor arrangement stated is in the first layer insulating layer or thermal insulation layer close to the fused salt pot sidewall and base foundation.
6. the system of the array distributed monitoring fused salt storage tank leakage of thinning FBG as claimed in claim 5, which is characterized in that institute
The FBG optical sensor stated includes the fibre core with metal coating, is located at Bragg grating in the fibre core, is wrapped in metal painting
Silicone resin inner cladding and stainless steel cloth surrounding layer outside coating；At the Bragg grating by corrosion keep inner cladding thinning or
It is corroded completely.
7. the system of the array distributed monitoring fused salt storage tank leakage of thinning FBG as claimed in claim 5, which is characterized in that institute
It states in the first layer insulating layer outside fused salt pot sidewall, the FBG optical sensor is connected by way of spiral winding.
8. the system of the array distributed monitoring fused salt storage tank leakage of thinning FBG as claimed in claim 5, which is characterized in that institute
It states in the first layer thermal insulation layer of fused salt tank base foundation, the FBG optical sensor is connected cloth in the way of snail
It sets.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910580048.7A CN110342130A (en) | 2019-06-28 | 2019-06-28 | A kind of system of the array distributed monitoring fused salt storage tank leakage of thinning FBG |
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| CN201910580048.7A CN110342130A (en) | 2019-06-28 | 2019-06-28 | A kind of system of the array distributed monitoring fused salt storage tank leakage of thinning FBG |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111879019A (en) * | 2020-06-12 | 2020-11-03 | 浙江大学 | System for detecting fused salt leakage of photo-thermal power generation heat storage device by utilizing electrode plate |
| CN113525948A (en) * | 2021-06-07 | 2021-10-22 | 上海电气集团股份有限公司 | Three-dimensional array type circuit detection system and method for leakage of molten salt storage tank |
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| CN207300268U (en) * | 2017-10-16 | 2018-05-01 | 上海电力学院 | Fiber Bragg Grating FBG demodulating equipment |
| CN108844919A (en) * | 2018-04-25 | 2018-11-20 | 暨南大学 | The reflection type inclined fiber grating index sensor of covering and production, measurement method |
| CN208635974U (en) * | 2018-06-08 | 2019-03-22 | 青岛鸿瑞电力工程咨询有限公司 | A kind of fused salt heat storage can leak detection apparatus |
| CN109781346A (en) * | 2019-01-30 | 2019-05-21 | 青岛鸿瑞电力工程咨询有限公司 | A kind of high temperature melting salt cellar leakage real time on-line monitoring device and detection method |
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| CN202346221U (en) * | 2011-12-09 | 2012-07-25 | 长沙锅炉厂有限责任公司 | High-temperature internal insulated storage tank for storing solar thermal power generating thermal storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111879019A (en) * | 2020-06-12 | 2020-11-03 | 浙江大学 | System for detecting fused salt leakage of photo-thermal power generation heat storage device by utilizing electrode plate |
| CN111879019B (en) * | 2020-06-12 | 2022-03-18 | 浙江大学 | System for detecting fused salt leakage of photo-thermal power generation heat storage device by utilizing electrode plate |
| CN113525948A (en) * | 2021-06-07 | 2021-10-22 | 上海电气集团股份有限公司 | Three-dimensional array type circuit detection system and method for leakage of molten salt storage tank |
| CN113525948B (en) * | 2021-06-07 | 2023-09-19 | 上海电气集团股份有限公司 | Three-dimensional array type circuit detection system and method for molten salt storage tank leakage |
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Application publication date: 20191018 |