CN112697301B - Fully-distributed pipeline erosion monitoring system and method based on optical fiber sensing - Google Patents
Fully-distributed pipeline erosion monitoring system and method based on optical fiber sensing Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000013307 optical fiber Substances 0.000 title claims abstract description 18
- 230000003628 erosive effect Effects 0.000 title description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 76
- 239000002689 soil Substances 0.000 claims abstract description 43
- 230000007797 corrosion Effects 0.000 claims abstract description 7
- 238000005260 corrosion Methods 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims description 8
- 238000009933 burial Methods 0.000 claims description 6
- 230000036760 body temperature Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 239000011241 protective layer Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention discloses a fully-distributed pipeline corrosion monitoring system and method based on optical fiber sensing, and the system comprises a pipeline, two temperature sensing optical cables and a temperature demodulator, wherein the pipeline is buried in soil, a first temperature sensing optical cable is laid in the soil 10-20 cm away from the position right above the pipeline, and a second temperature sensing optical cable is laid at a certain distance from the position right above the first temperature optical cable; the two temperature sensing optical cables are laid along the axial direction of the pipeline in the whole process, and the same ends of the two temperature sensors are respectively connected with the temperature demodulator to form a loop; the temperature demodulator collects the soil temperature of the buried position through the temperature sensing optical cables, the first temperature sensing optical cable measures the temperature T1 of the pipeline position, and the second temperature sensing optical cable measures the temperature T2 of the reference position. The device has the characteristics of simple installation, instant feedback, labor saving and good weather interference resistance.
Description
Technical Field
The invention belongs to geological monitoring technology, and particularly relates to a fully-distributed pipeline erosion monitoring system and method based on optical fiber sensing.
Background
In the pipeline engineering, the integrity of the pipeline is more easily threatened due to the fact that the pipeline is exposed due to the fact that the covering soil layer is thinned, and especially when the pipeline passes through a high-consequence area, leakage can seriously affect the local natural ecology and the health of people. Therefore, prevention and monitoring of pipe erosion is an important issue in the pipe operation process.
At present, in the aspect of monitoring the thickness of a covering layer on the surface of a pipeline, a method of manually inspecting and adopting sand marking poles in important areas is mainly adopted in the industry, but both methods are difficult to achieve real full-coverage monitoring, and have certain time lag because of the need of on-site confirmation of personnel. The manual inspection usually requires that the pipeline is partially exposed in a certain area to find problems, and the thinning of the pipeline covering soil protective layer is difficult to identify. For some emerging instrument measurement methods based on optical and acoustic principles, the accuracy is greatly influenced due to the fact that the instrument measurement methods are easily restricted by factors such as weather and climate.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the defects in the prior art, provides a fully-distributed pipeline erosion monitoring system and method based on optical fiber sensing, and has the characteristics of simplicity and easiness in installation, instant feedback, manpower saving and good weather interference resistance.
The technical scheme is as follows: the invention provides a fully-distributed pipeline corrosion monitoring system based on optical fiber sensing, which comprises a pipeline, a temperature sensing optical cable and a temperature demodulator, wherein the pipeline is buried in soil, a first temperature sensing optical cable is laid in the soil 10-20 cm away from the position right above the pipeline, and a second temperature optical cable is laid at a certain distance (the distance is more than 1m, for example, the value is 1.1m) right above the first temperature optical cable; the two temperature sensing optical cables are laid along the axial direction of the pipeline in the whole process, and the same ends of the two temperature sensors are respectively connected with the temperature demodulator to form a loop; the temperature demodulator collects the soil temperature of the buried position through the temperature sensing optical cables, the first temperature sensing optical cable measures the temperature T1 of the pipeline position, and the second temperature sensing optical cable measures the temperature T2 of the reference position.
Furthermore, the two temperature sensing optical cables are both communication optical cables, and each communication optical cable comprises an optical fiber and a protective layer wrapped on the periphery of the optical fiber.
Furthermore, the two temperature sensing optical cable loops are respectively integrated in the two corresponding composite optical cables; the composite optical cable and the pipeline are both embedded in the soil body, and the composite optical cable is located right above the pipeline. The temperature sensing optical cable is integrated in the protective sleeve at the periphery of the composite optical cable, so that the capability of resisting environmental erosion and external force of the temperature sensing optical cable is improved, and the inspection and the overhaul are convenient
The invention also discloses a monitoring method of the fully distributed pipeline corrosion monitoring system based on the optical fiber sensing, which comprises the following steps:
s1, installing the pipeline, the temperature sensing optical cable and the temperature demodulator;
s2, starting a temperature demodulator, respectively generating a temperature-time curve of the soil body in real time through two temperature optical cables, and obtaining the following formula (1) according to the change rule of the temperature at a certain position in the soil body along with time:
t (z, T) ═ T (z) + a (z) sin (ω T + ψ (z)) formula (1)
Wherein T (z, T) is a soil body temperature value when the burial depth z is at T, z is the burial depth of the temperature sensing optical cable, T (z) is the average temperature of the soil body at z, A (z) is the amplitude at z, T is time, omega is the frequency at z, and psi is the initial phase at z;
s3, calculating the phase difference of the temperature-time curve of the position to be measured by the first temperature optical cable and the temperature-time curve of the reference position measured by the second temperature optical cable at the same moment, wherein if the phase difference value is kept constant, the soil covering the surface of the pipeline is not eroded, and if the phase difference value is kept small, the soil covering the surface of the pipeline is eroded, and the thickness of the soil is reduced.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) the monitoring system only needs the temperature sensing optical cable and the temperature demodulator, and has the advantages of exquisite structure, simple installation, convenient maintenance and low cost;
(2) the temperature is represented by using the change of the physical quantity of the transmission light in the temperature sensing optical cable, so that the information can be transmitted immediately;
(3) the optical cable is buried along the whole length of the pipeline, so that the whole-process monitoring of the pipeline engineering can be realized;
(4) the invention transmits the relevant temperature information to the corresponding valve chamber, and only the staffs need to be stationed in the valve chamber without arranging patrol staffs.
(5) According to the invention, the erosion condition is monitored by comparing the phase difference of the two temperature-time curves, and the measurement accuracy is not influenced by weather changes such as rainfall and the like.
Drawings
FIG. 1 is a schematic overall structure diagram according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the relative positioning of the temperature sensing cables and the pipeline in accordance with an embodiment of the present invention;
fig. 3 is a temperature-time graph of air temperature and soil temperature in an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.
As shown in fig. 1 and 2, the fully distributed pipeline corrosion monitoring system based on optical fiber sensing of the present invention includes a pipeline 1, two temperature sensing optical cables and a temperature demodulator 2, where the pipeline 1 is buried in a soil body, a first temperature sensing optical cable 3 is laid in the soil body 10-20 cm above the pipeline 1, and a second temperature sensing optical cable 4 is laid at a certain distance (in this embodiment, the distance is set to 1.5m) above the first temperature sensing optical cable 3; two temperature sensing optical cables are laid along the axial direction of the pipeline in the whole process, and two ends of the two temperature sensing optical cables are respectively connected with the temperature demodulator 2 to form a loop; the temperature demodulator 2 acquires the soil body temperature at the corresponding buried position through two temperature sensing optical cables, the first temperature sensing optical cable 3 measures the temperature at the pipeline position, and the second temperature sensing optical cable 4 measures the temperature at the reference position.
Furthermore, the two temperature sensing optical cables adopt communication optical cables which comprise optical fibers and protective layers wrapped on the peripheries of the optical fibers.
In order to ensure the data accuracy of the monitoring system during operation, the temperature sensing optical cable loops in the embodiment are respectively integrated in the first pipeline 5 and the second pipeline 6; the first pipeline 5, the second pipeline 6 and the pipeline 1 are all buried in the soil body, and the two composite optical cables are located right above the pipeline 1.
The fully distributed pipeline erosion monitoring method based on optical fiber sensing comprises the following steps:
s1, installing the pipeline 1, two temperature sensing optical cables and the temperature demodulator 2;
s2, starting the temperature demodulator 2, respectively generating a temperature-time curve of the soil body in real time through the two temperature optical cables, and obtaining that the change rule of the temperature at a certain position in the soil body along with time is approximate according to a test, wherein the following formula (1) is a sine function:
t (z, T) ═ T (z) + a (z) sin (ω T + ψ (z)) formula (1)
Wherein T (z, T) is a soil body temperature value when the burial depth z is at T, z is the burial depth of the temperature sensing optical cable, T (z) is the average temperature of the soil body at z, A (z) is the amplitude at z, T is time, omega is the frequency at z, and psi is the initial phase at z;
s3, calculating the phase difference of the temperature-time curve of the position to be measured by the first temperature optical cable 3 and the temperature-time curve of the reference position measured by the second temperature optical cable 4 at the same moment, wherein if the phase difference value is kept constant, the covered soil on the surface of the pipeline 1 is not eroded, and if the phase difference value is kept small, the covered soil on the surface of the pipeline 1 is eroded, and the thickness of the soil is reduced.
In this embodiment, the phase difference of the two curves at the position to be measured and the reference position (i.e., the embedded position of the two temperature sensing optical cables) is determined, the phase difference is a relative value, and the weather does not affect the phase difference.
Example (b): in this embodiment, the soil body embedded in the pipeline 1 and the two temperature sensing optical cables is clay.
As shown in fig. 3, the depths of three soil bodies from the ground to the bottom in the same vertical direction are set to be 0m, 0.1m and 0.3m, and the temperature-time curves of the three soil bodies at 0m, 0.1m and 0.3m all show a periodic variation law. Compared with the temperature-time curve with the embedding depth of 0m, the phase difference between the curves with 0.1m and 0.3m is respectively 5 and 10h, namely the difference of the embedding depths is different, and the phase difference is different accordingly. Therefore, by respectively burying the temperature sensing optical cable at the position of the pipeline 1 to be measured and burying the temperature sensing optical cable at the upper reference position, the erosion condition of the soil body on the surface of the pipeline 1 can be judged through the change of the phase difference of the two temperature-time curves. And because the change of an external heat source brought by the weather such as rainfall has certain influence on the temperature-time curve, but basically has no influence on the phase difference serving as a relative value, the change of the weather basically does not cause interference on the monitoring method.
Claims (3)
1. A monitoring method of a fully distributed pipeline corrosion monitoring system based on optical fiber sensing is characterized in that: the monitoring system comprises a pipeline, two temperature sensing optical cables and a temperature demodulator, wherein the pipeline is buried in soil, a first temperature sensing optical cable is laid in the soil 10-20 cm away from the position right above the pipeline, and a second temperature sensing optical cable is laid at a certain distance right above the first temperature optical cable; the two temperature sensing optical cables are laid along the axial direction of the pipeline in the whole process, and the same ends of the two temperature sensors are respectively connected with the temperature demodulator to form a loop; the temperature demodulator collects the soil temperature of the buried position through temperature sensing optical cables, the first temperature sensing optical cable measures the temperature T1 of the pipeline position, and the second temperature sensing optical cable measures the temperature T2 of the reference position;
the monitoring method comprises the following steps:
s1, installing the pipeline, the temperature sensing optical cable and the temperature demodulator;
s2, starting a temperature demodulator and a monitoring valve chamber, respectively generating temperature-time curves corresponding to the measured soil body in real time through two temperature optical cables, and obtaining a formula (1) according to the change rule of the temperature at a certain position in the soil body along with time;
t (z, T) ═ T (z) + a (z) sin (ω T + ψ (z)) formula (1)
Wherein T (z, T) is a soil body temperature value when the burial depth z is at T, z is the burial depth of the temperature sensing optical cable, T (z) is the average temperature of the soil body at z, A (z) is the amplitude at z, T is time, omega is the frequency at z, and psi is the initial phase at z;
s3, calculating the phase difference of the temperature-time curve of the position to be measured by the first temperature optical cable and the temperature-time curve of the reference position measured by the second temperature optical cable at the same moment, wherein if the phase difference value is kept constant, the soil covering the surface of the pipeline is not eroded, and if the phase difference value is kept small, the soil covering the surface of the pipeline is eroded, and the thickness of the soil is reduced.
2. The monitoring method of the fully distributed pipeline corrosion monitoring system based on optical fiber sensing according to claim 1, characterized in that: and the two temperature sensing optical cables are both communication optical cables which comprise optical fibers and protective layers wrapped on the peripheries of the optical fibers.
3. The monitoring method of the fully distributed pipeline corrosion monitoring system based on optical fiber sensing according to claim 1, characterized in that: the two temperature sensing optical cable loops are respectively integrated in the two corresponding composite optical cables; the composite optical cable and the pipeline are both embedded in the soil body, and the composite optical cable is located right above the pipeline.
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| CN1712919A (en) * | 2005-07-04 | 2005-12-28 | 秦一涛 | Positioning distributed fibre-optical temperature sensing monitor and method for pipeline leakage |
| CN102590275A (en) * | 2012-02-24 | 2012-07-18 | 大连理工大学 | Suspended monitoring device and monitoring method of submarine pipeline based on active temperature control distributed temperature monitoring |
| CN105953940B (en) * | 2016-04-21 | 2018-03-30 | 北京卫星环境工程研究所 | Temperature, humidity and the wind speed integration composite sensing system of fiber grating |
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