阅读说明：本技术 一种预埋金属化光纤传感器的防腐燃气管道 (Pre-buried metallization optical fiber sensor's anticorrosive gas pipeline ) 是由 杨帆 王伟德 孙超 毕丁丁 王鹏华 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种预埋金属化光纤传感器的防腐燃气管道,包括燃气管道,燃气管道的外表面缠绕有金属化光纤传感器,且金属化光纤传感器螺旋状紧贴缠绕在燃气管道上,燃气管道的外表面设置有防腐涂层,金属化光纤传感器位于防腐涂层与燃气管道之间,防腐涂层包括底层、中间层和面层,底层为环氧类粉末层,中间层为胶粘剂层,面层为聚乙烯层,金属化传感器包括金属化区、尾纤和光纤接头,尾纤有金属化区引出,尾纤的端部连接有光纤接头。本发明采用金属化光纤传感器埋入燃气管道防腐涂层中,成为预埋金属化光纤传感器的防腐燃气管道；单根光纤缠绕在燃气管道上就可完全覆盖管道,同时监测温度、振动和应变,带来更好的使用前景。(The invention discloses an anti-corrosion gas pipeline with a pre-buried metalized optical fiber sensor, which comprises a gas pipeline, wherein the outer surface of the gas pipeline is wound with the metalized optical fiber sensor, the metalized optical fiber sensor is spirally and tightly wound on the gas pipeline, the outer surface of the gas pipeline is provided with an anti-corrosion coating, the metalized optical fiber sensor is positioned between the anti-corrosion coating and the gas pipeline, the anti-corrosion coating comprises a bottom layer, a middle layer and a surface layer, the bottom layer is an epoxy powder layer, the middle layer is an adhesive layer, the surface layer is a polyethylene layer, the metalized sensor comprises a metalized area, a tail fiber and an optical fiber connector, the tail fiber is led out from the metalized area, and the end part of the. The invention adopts the metallized optical fiber sensor to be embedded in the anticorrosive coating of the gas pipeline, thus forming the anticorrosive gas pipeline with the embedded metallized optical fiber sensor; the single optical fiber is wound on the gas pipeline to completely cover the pipeline, and meanwhile, the temperature, the vibration and the strain are monitored, so that a better use prospect is brought.)

1. The utility model provides a pre-buried metallized optical fiber sensor's anticorrosive gas pipeline, includes gas pipeline (1), its characterized in that: the outer surface winding of gas pipeline (1) has metallized optical fiber sensor (3), just metallized optical fiber sensor (3) heliciform hugs closely the winding on gas pipeline (1), the surface of gas pipeline (1) is provided with anticorrosive coating (2), metallized optical fiber sensor (3) are located between anticorrosive coating (2) and gas pipeline (1).

2. The corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as recited in claim 1, characterized in that: anticorrosive coating (2) include bottom, intermediate level and surface course, the bottom is epoxy powder layer, the intermediate level is the adhesive layer, the surface course is the polyethylene layer.

3. The corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as recited in claim 1, characterized in that: the metallized sensor (3) comprises a metallized area, a tail fiber and an optical fiber connector, wherein the metallized area of the tail fiber is led out, and the end part of the tail fiber is connected with the optical fiber connector.

4. The corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as recited in claim 3, characterized in that: the metalized area comprises two groups of metalized sublayers, the first metalized sublayer is deposited on the surface of the optical fiber through a chemical method, and the second metalized sublayer is plated on the surface of the first metalized sublayer through an electroplating method.

5. The corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as recited in claim 4, is characterized in that: the diameter of the metallized area is 0.4-1.2 mm.

6. The utility model provides a monitoring system of anticorrosive gas pipeline of pre-buried metallized optical fiber sensor which characterized in that: an anti-corrosion gas pipeline comprising an embedded metallized optical fiber sensor according to any one of claims 1 to 5.

7. The monitoring system of the pre-buried metallized optical fiber sensor anticorrosion gas pipeline as claimed in claim 6, characterized in that: the BOTDA/optical time domain analyzer is characterized by further comprising an optical switch, a BOTDA Brillouin optical time domain analyzer, a DAS distributed sound analyzer and a DTS distributed optical fiber thermometer.

8. The monitoring system of the pre-buried metallized optical fiber sensor anticorrosion gas pipeline, according to claim 7, is characterized in that: the output end of the metallized optical fiber sensor (3) is respectively connected with a BOTDA Brillouin optical time domain analyzer, a DAS distributed sound analyzer and a DTS distributed optical fiber thermometer through an optical switch.

Technical Field

The invention relates to the field of gas pipelines, in particular to an anticorrosion gas pipeline with a pre-embedded metalized optical fiber sensor, and further comprises a monitoring system of the anticorrosion gas pipeline with the pre-embedded metalized optical fiber sensor.

Background

The natural gas pipeline is an important component of urban construction, and nowadays, the surface of the pipeline adopts a reinforced 3PE anticorrosion technology, and the expected safe service life can reach 50 years. Nevertheless, the gas company still needs to pay attention to the operation and maintenance safety of the high-pressure gas pipeline. With the rapid development of urban buried natural gas pipelines, pipeline leakage caused by various reasons frequently occurs. The leakage accidents of the buried natural gas pipeline in China occur occasionally, once the natural gas pipeline is leaked and other dangerous conditions occur, the leakage of volatile organic matters can be caused to cause catastrophic environmental pollution, and huge losses can be caused to various industries and daily life in the whole market.

Disclosure of Invention

The invention mainly aims to provide an anti-corrosion gas pipeline with a pre-embedded metalized optical fiber sensor, which can effectively solve the problems in the background art.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a pre-buried metallized optical fiber sensor's anticorrosive gas pipeline, includes the gas pipeline, the surface winding of gas pipeline has metallized optical fiber sensor, just the winding is hugged closely to metallized optical fiber sensor heliciform on the gas pipeline, the surface of gas pipeline is provided with anticorrosive coating, metallized optical fiber sensor is located between anticorrosive coating and the gas pipeline.

Preferably, the anticorrosive coating includes bottom, intermediate level and surface course, the bottom is epoxy powder layer, the intermediate level is the adhesive layer, the surface course is the polyethylene layer.

Preferably, the metallized sensor comprises a metallized area, a tail fiber and an optical fiber connector, wherein the metallized area of the tail fiber is led out, and the end part of the tail fiber is connected with the optical fiber connector.

Preferably, the metalized area comprises two groups of metalized sublayers, the first metalized sublayer is deposited on the surface of the optical fiber through a chemical method, and the second metalized sublayer is plated on the surface of the first metalized sublayer through an electroplating method.

Preferably, the diameter of the metallised zones is from 0.4 to 1.2 mm.

The utility model provides a monitoring system of pre-buried metallization optical fiber sensor anticorrosive gas pipeline, contains as above-mentioned a pre-buried metallization optical fiber sensor's anticorrosive gas pipeline.

Preferably, the optical switch, the BOTDA Brillouin optical time domain analyzer, the DAS distributed sound analyzer and the DTS distributed optical fiber thermometer are further included.

Preferably, the output end of the metallized optical fiber sensor is respectively connected with the BOTDA brillouin optical time domain analyzer, the DAS distributed sound analyzer, and the DTS distributed optical fiber thermometer through an optical switch.

Compared with the prior art, the anti-corrosion gas pipeline with the embedded metalized optical fiber sensor and the monitoring system for the anti-corrosion gas pipeline with the embedded metalized optical fiber sensor have the following beneficial effects that:

1. the metallized optical fiber sensor is embedded into the pipeline anti-corrosion coating, the ester coating on the surface of the common optical fiber is replaced by metal, the strength is high, the corrosion is resistant, the aging is not easy to occur, the monitoring stability is improved, and the service life is prolonged.

2. The metallized optical fiber sensor is spirally and tightly wound on a gas pipeline at a certain pitch, the optical fiber covers all directions of the gas pipeline, the pitch size is calculated and tested, the fact that the optical fiber generates events at any position of the gas pipeline can be captured, and the sensing precision is improved.

3. The metallized optical fiber sensor is positioned between the anticorrosive coating and the gas pipeline, the optical fiber can be tightly attached to the gas pipeline, physical quantities such as temperature, vibration, strain and the like generated on the gas pipeline can be directly transmitted to the optical fiber, then the optical signal can be analyzed through Brillouin effect, Raman effect and Rayleigh effect of three devices by the monitoring system, strain, temperature and vibration data of the pipeline along the way can be given, the position of an event can be accurately positioned, and the monitoring accuracy is guaranteed.

4. According to the traditional pipeline optical fiber monitoring method, a plurality of optical fibers are embedded to ensure that the pipeline is covered in an all-round mode, and the monitoring mode can monitor a plurality of parameters such as temperature, vibration and strain of the gas pipeline simultaneously only by one optical fiber, so that the cost is saved.

Drawings

FIG. 1 is a structural diagram of an anti-corrosion gas pipeline of an embedded metallized optical fiber sensor according to the present invention;

fig. 2 is a schematic diagram of a monitoring system of an anti-corrosion gas pipeline with a pre-embedded metallized optical fiber sensor according to the invention.

In the figure: 1. a gas pipeline; 2. an anti-corrosion coating; 3. a metallized fiber optic sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The anti-corrosion gas pipeline of the pre-buried metalized optical fiber sensor of the embodiment is shown in fig. 1 and comprises a gas pipeline 1, a metalized optical fiber sensor 3 is wound on the outer surface of the gas pipeline 1, the metalized optical fiber sensor 3 is wound on the gas pipeline 1 in a spiral manner in a clinging manner, an anti-corrosion coating 2 is arranged on the outer surface of the gas pipeline 1, the anti-corrosion coating 2 comprises a bottom layer, a middle layer and a surface layer, the bottom layer is an epoxy powder layer, the middle layer is an adhesive layer, the surface layer is a polyethylene layer, the metalized optical fiber sensor 3 is positioned between the anti-corrosion coating 2 and the gas pipeline 1, the metalized sensor 3 comprises a metalized area, a tail fiber and an optical fiber connector, the tail fiber is led out from the metalized area, the end part of the tail fiber is connected with the optical fiber connector, the metalized area comprises two metalized sub-layers, the first metalized sub-layer is deposited on the surface of, the second metalized sublayer is plated on the surface of the first metalized sublayer by an electroplating method, and the diameter of the metalized area is 0.4-1.2 mm.

The metallized optical fiber sensor 3 is embedded into the anti-corrosion coating 2, and an ester coating layer on the surface of a common optical fiber is replaced by metal, so that the intensity is high, the corrosion is resistant, and the aging is not easy to occur; the metallized optical fiber sensor 3 is tightly wound on the gas pipeline 1 at a certain pitch, the optical fiber covers all directions of the gas pipeline 1, the pitch size is calculated and tested, the optical fiber can be guaranteed to capture events generated by the gas pipeline 1 at any position, and the sensing precision is improved; the metallized optical fiber sensor 3 is positioned between the anticorrosive coating 2 and the gas pipeline 1, the optical fiber can be tightly attached to the gas pipeline 1, and physical quantities such as temperature, vibration, strain and the like generated on the gas pipeline 1 can be directly transmitted to the metallized optical fiber sensor 3, so that the monitoring accuracy is ensured; a plurality of parameters such as temperature, vibration, strain and the like of the gas pipeline 1 can be monitored simultaneously by only one optical fiber of one group of gas pipeline 1, and the cost is saved.

The monitoring system of the corrosion-resistant gas pipeline of the embedded metalized optical fiber sensor in the embodiment is shown in fig. 2 and comprises the corrosion-resistant gas pipeline of the embedded metalized optical fiber sensor.

The testing device further comprises an optical switch, a BOTDA Brillouin optical time domain analyzer for measuring strain of the gas pipeline 1, a DAS distributed sound analyzer for measuring vibration of the gas pipeline 1 and a DTS distributed optical fiber temperature measuring instrument for measuring temperature of the gas pipeline 1.

The BOTDA Brillouin optical time domain analyzer is based on stimulated Brillouin scattering effect, and utilizes two laser light sources with ultra-narrow line widths, namely pump light (pulse light signals) and probe light (continuous light signals), to be respectively injected into a sensing optical fiber, and the probe light signals are measured at the pulse light end of the sensing optical fiber, and high-speed data acquisition and processing are carried out. When the frequency difference between the pump light and the probe light is equal to the Brillouin frequency shift of a certain section in the optical fiber, the stimulated Brillouin amplification effect occurs in the region, and energy transfer occurs between the two beams of light. By scanning the frequency of the detection light, the Brillouin spectrum of any point along the optical fiber can be obtained, so that distributed strain measurement can be obtained.

The DAS distributed sound analyzer utilizes the characteristic that the optical fiber is sensitive to sound (vibration), when external vibration acts on the sensing optical fiber, due to the elasto-optical effect, the refractive index and the length of the optical fiber are slightly changed, so that the phase of a transmission signal in the optical fiber is changed, and the light intensity is changed. The detection of the vibration event can be realized by monitoring the intensity change of Rayleigh scattering optical signals before and after vibration, and the simultaneous accurate positioning of multiple vibration events is realized.

The DTS distributed optical fiber thermometer measures the temperature and is based on the spontaneous Raman scattering effect. After a high-power narrow-pulse-width laser pulse LD is incident to a sensing optical fiber, laser interacts with optical fiber molecules to generate extremely weak back scattering light, wherein the anti-stokes temperature is sensitive and is signal light; the stokes temperature is insensitive and is reference light, and the temperature can be calculated according to the light intensity ratio of the two.

If the gas pipeline 1 is damaged, the gas pipeline 1 can generate strain change; if the gas pipeline 1 leaks, the temperature of the leaking part can change; if the gas pipeline 1 corrodes, the thickness of the wall of the gas pipeline 1 changes, and the high-pressure gas passing through the gas pipeline 1 can enable the pipeline to vibrate.

After the anti-corrosion gas pipelines 1 of the pre-buried metalized optical fiber sensors 3 are connected in series through optical fiber connectors, in order to enable one metalized optical fiber in the gas pipeline 1 to be simultaneously connected with three devices to respectively measure strain, vibration and temperature, the optical fiber connector on the last gas pipeline 1 is respectively connected with a BOTDA Brillouin optical time domain analyzer, a DAS distributed sound analyzer and a DTS distributed optical fiber temperature measuring instrument through optical switches, the devices comprise the BOTDA Brillouin optical time domain analyzer (for measuring strain), the DAS distributed sound analyzer (for measuring vibration) and the DTS distributed optical fiber temperature measuring instrument (for measuring temperature), optical signals in the three devices alternately enter the metalized optical fiber sensors 3 buried in the anti-corrosion coating layer 2 through the optical switches, if the pipelines of the gas pipeline 1 are damaged, leaked or corroded along the way, the Brillouin effect, the Raman effect and the Rayleigh effect of the three devices are passed through, analysis of the optical signal gives strain, temperature and vibration data along the pipeline and pinpoints where the event occurred.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.