CN105221936A - The device of a kind of monitoring and location direct-burried heat distribution pipeline leakage point and controlling method thereof - Google Patents

Abstract

Present invention is disclosed the device of a kind of monitoring and location direct-burried heat distribution pipeline leakage point, heat insulation layer is provided with outside heat distribution pipeline, this device is provided with computer, and described computer connects sensor fibre by fiber sensing module, and described sensor fibre extends along between described heat distribution pipeline and heat insulation layer.Whether the device of monitoring of the present invention and locating leaks point can automatically leak in distributed monitoring directly buried heat distribution pipeline road, and the general orientation of leakage point at cross-section of pipeline can be judged, when pipeline occurs to leak, this device accurately can be located leakage point and be given the alarm in time and leak point positioning report.And leak point positioning speed is fast, precision is high, occur after pipe leakage, just can fault point in several minutes, shortening heat hydraulic piping repair time.And this device can locate multiple leakage point, realizes directly buried heat distribution pipeline road distributed monitoring and location simultaneously.

Description

A device for monitoring and locating leakage points of directly buried thermal pipelines and its control method

technical field

The invention relates to a monitoring and locating device, in particular to an automatic distributed monitoring and locating device for directly buried thermal pipeline leakage points.

Background technique

With the improvement of people's living standards, heating and other thermal facilities have become necessary for winter, and pipeline transportation has become a convenient and economical thermal transportation method. However, the aging of pipeline equipment and man-made damage often cause leakage of thermal pipelines, which seriously affects heating and heating. Therefore, it is very necessary to monitor and locate the leakage of the pipeline.

At present, there are relatively few corresponding studies on thermal pipelines. When a pipeline leaks, more personnel are used to find the leak point along the pipeline using infrared detection technology and manual observation. The use of temperature sensors to monitor thermal pipelines is mostly point detection, which requires multiple detectors, the detection distance is inaccurate, the cost is high, and maintenance is difficult.

Contents of the invention

The technical problem to be solved by the present invention is to realize a device that can monitor whether the pipeline leaks, and when the pipeline leaks, it can quickly and accurately determine the position of the pipeline leakage point, and can judge the approximate orientation of the leakage point in the pipeline cross section

In order to achieve the above object, the technical solution adopted by the present invention is: a device for monitoring and locating the leakage point of a direct-buried thermal pipeline. The thermal pipeline is provided with an insulating layer. A sensing fiber is connected, and the sensing fiber extends along the thermal pipe and the heat insulation layer.

There are at least three sensing optical fibers arranged at equal intervals between the heat pipe and the heat insulation layer.

The thermal insulation layer is provided with a first sensing optical fiber connected to the optical fiber sensing module, and the first sensing optical fiber is arranged along the thermal insulation layer and has a distance from the thermal insulation layer.

There are three sensing optical fibers extending between the thermal pipe and the heat insulating layer, namely the second sensing optical fiber, the third sensing optical fiber and the fourth sensing optical fiber. The cross-sections of the three sensing optical fibers are inverted positive. The triangle is arranged between the heat pipe and the heat insulation layer.

The heat insulation layer is provided with a discharge point at intervals, and the discharge point is located on the lower surface or obliquely above the heat insulation layer.

The first sensing optical fiber is located directly above the heat insulating layer, and the distance from the heat insulating layer is 8-12 cm.

A control method for a device for monitoring and locating leakage points of direct-buried thermal pipelines, characterized in that:

Step 1. Start measurement;

Step 2, collecting the temperature between the thermal pipeline and the insulation layer;

Step 3, comparing the collected temperature with a preset threshold;

Step 4. If it is less than the threshold, return to step 2; if it is greater than the threshold, it is determined that there is a leak;

Step 5, obtaining the optical fiber position points greater than the preset threshold;

Step 6: Output the leak report.

The step 2 collects the temperature outside the insulation layer at the same time;

The step 3 compares the collected temperature outside the insulation layer with a preset threshold;

The step 4 determines at the same time, if the temperature outside the insulation layer is greater than the preset threshold, it is determined that the insulation layer has leaks, and if the temperature outside the insulation layer is lower than the preset threshold, it is determined that there is no leakage in the insulation layer.

In the step 5, the temperatures detected by the thermal pipeline and the thermal insulation layer sensing fiber are sorted, and the leakage point is located between the sensing fibers with the top two temperatures.

The device for monitoring and locating leakage points of the present invention can automatically and distributedly monitor whether direct-buried thermal pipelines leak, and can judge the approximate orientation of the leakage point in the cross-section of the pipeline. When the pipeline leaks, the device can accurately locate the leakage point And issue an alarm and leak point location report in time. Moreover, the leakage point positioning speed is fast and the accuracy is high. After a pipeline leak occurs, the fault point can be located within a few minutes, shortening the repair time of the thermal pipeline. Moreover, the device can locate a plurality of leakage points at the same time, and realize distributed monitoring and positioning of direct-buried thermal pipelines.

Description of drawings

The following is a brief description of the content expressed in each drawing in the description of the present invention and the marks in the figure:

Fig. 1 is the structural representation of this device;

Fig. 2 is the structural diagram of the cross-section after the thermal pipeline of the device is laid with optical fibers and heat insulating layers;

Fig. 3 is the flow chart of this device control method;

The marks in the above figures are: 1. computer; 2. optical fiber sensing module; 3. first sensing optical fiber; 4. second sensing optical fiber; 5. third sensing optical fiber; 6. fourth sensing optical fiber ; 7. Thermal pipeline; 8. Insulation layer.

detailed description

The device for monitoring and locating the leakage point of the directly buried thermal pipeline 7 includes a computer 1, an optical fiber sensing module 2 and sensing optical fibers, wherein the computer 1 and sensing optical fibers are peripheral devices, and the optical fiber sensing module 2 is enclosed in a box.

The computer 1 uses an industrial-grade computer 1 to control the work of the optical fiber sensing module 2 through the communication interface, and reads the output data of the optical fiber sensing module 2 for storage and analysis, and obtains and displays a work report; the optical fiber sensing module 2 adopts The distributed optical fiber temperature sensing module based on Raman backscattering performs distributed measurement on the temperature information along the thermal pipeline 7 . The sensing optical fiber adopts Corning's SM-28e+ common single-mode optical fiber, which is used to measure the distributed temperature information along the thermal pipeline 7 .

The computer 1 is connected to the input end of the optical fiber sensing module 2 to transmit work instructions, and can periodically issue work instructions to realize the automatic monitoring and positioning of the device. The output end of the optical fiber sensing module 2 is connected to the computer 1 through the communication interface, and the collected The data is transmitted to computer 1. When the monitoring and positioning device starts to work, the optical fiber sensing module 2 transmits a pulsed light signal to the sensing fiber, and receives the distributed Raman backscattered light signal of the optical fiber along the thermal pipeline 7, and denoises the received light signal , to obtain Stokes light and anti-Stokes light through spectroscopic processing, which are amplified and collected, and transmitted to computer 1 for storage and analysis, and the temperature distribution along the thermal pipeline 7 is obtained by using optical time domain reflection technology based on Raman scattering information.

As shown in Figure 1, the heat pipe 7 is provided with a heat insulating layer 8, and a sensing fiber is arranged between the heat pipe 7 and the heat insulating layer 8. In order to accurately locate the leakage location, at least three sensing fibers are preferably provided. Three sensing optical fibers are arranged at equal intervals between the heat pipe 7 and the heat insulating layer 8 . However, for the thermal pipeline 7 with a larger diameter, more than three sensing optical fibers can be provided to improve the positioning accuracy. In addition, the first sensing optical fiber 3 can be laid along the outer surface of the thermal pipeline 7 for measuring the ambient temperature and identifying whether the heat insulating layer 8 leaks. The first sensing optical fiber 3 needs to have a certain distance from the thermal insulation layer 8, the spacing is 8-12cm, preferably 10cm, and the position is located directly above the thermal insulation layer 8, because the first sensing optical fiber 3 needs to be able to measure the temperature of the thermal pipe 7. Ambient temperature also needs to improve accuracy, so too large or too small spacing may affect the measurement parameters, so controlling the distance at about 10cm is the best distance, and the position directly above can better obtain the external temperature conditions , since most disturbing heat sources come from the surface.

Optimum solution: for most of the thermal pipelines 7, it is enough to install three sensing fibers, which can not only control the cost well, but also accurately obtain the position of the leak point, which are the second sensing fiber 4 and the third sensing fiber 5 respectively. and the fourth sensing optical fiber 6, as shown in Figure 2, the cross-section of the three sensing optical fibers is an inverted equilateral triangle and is arranged between the thermal pipe 7 and the heat insulating layer 8, because the leaked hot water generally stays in the thermal pipe 7 and the heat insulating layer. At the bottom of the gap in layer 8, the inverted structure enables each sensing fiber to measure the leakage temperature parameter as accurately as possible.

The heat insulation layer 8 has a small opening at intervals as a discharge point. The discharge point is located on the lower surface of the heat insulation layer 8 or obliquely above, preferably at an angle of 60° from the horizontal line, so as to prevent the heat pipe 7 from leaking due to excessive pressure and damage the heat insulation. layer 8, and cannot affect the first sensing optical fiber 3 at the same time.

As shown in Figure 3, when the positioning work starts, the computer 1 issues a work command, and the optical fiber sensing module 2 sends the first sensing optical fiber 3, the second sensing optical fiber 4, the third sensing optical fiber 5 and the fourth sensing optical fiber 6 Send a pulsed light signal, and receive the distributed Raman scattered light signal returned in the optical fiber along the thermal pipeline 7, and then perform noise reduction and light splitting to obtain Stokes light and anti-Stokes light, which are amplified It is collected, transmitted to the computer 1 for storage and analysis, and the temperature distribution information along the thermal pipeline 7 is obtained by using the optical time domain reflection technology based on Raman scattering.

When the directly buried thermal pipeline 7 leaks, the temperature around the leak point rises, which is much higher than the temperature of the non-leak point. An appropriate threshold temperature is set according to the environment of the thermal pipeline 7, and after the analysis of the computer 1, whether there is a leak point, if so, an alarm is issued and a report on the location of the pipeline leak point is given.

As shown in Fig. 3, a device for monitoring and locating the leakage point of direct-buried thermal pipeline 7 based on Raman scattered light time-domain reflectometry technology, its working process is as follows:

The computer 1 issues a work order, and the optical fiber sensing module 2 starts to work;

The optical fiber sensing module 2 emits a laser pulse into the first sensing optical fiber 3, the second sensing optical fiber 4, the third sensing optical fiber 5, and the fourth sensing optical fiber 6, and receives the pulled light transmitted back in the optical fiber along the thermal pipeline 7. Mann scattered light signal, and then perform noise reduction and light splitting to obtain Stokes light and anti-Stokes light, which are collected after amplification and transmitted to the computer 1;

The computer 1 analyzes the collected digital signals along the thermal pipeline 7, and obtains the temperature distribution of each point along the thermal pipeline 7 by using the optical time domain reflectometry principle based on Raman scattering;

Set a suitable threshold temperature according to the environment of the thermal pipeline 7, and judge whether the temperature detected by the sensing optical fiber exceeds the threshold temperature, if not, continue to collect data, and carry out the next round of judgment;

If the temperature detected by the sensing fiber exceeds the threshold temperature, it is judged whether the temperature detected by the sensing fiber exceeds the threshold temperature, if not, the point is located, and the second sensing fiber 4, the third sensing fiber 5 Sorted with the temperature detected by the fourth sensing optical fiber 6, on the cross-section of the pipeline, the leak point is located between the first two optical fibers in temperature, and there is no leakage in the heat insulation layer 8, and the computer 1 gives a leak point location report;

If the temperature detected by the first sensing fiber 3 exceeds the threshold temperature, it is judged whether the temperatures detected by the second sensing fiber 4 , the third sensing fiber 5 and the fourth sensing fiber 6 exceed the threshold temperature. If not, continue to collect data for the next round of analysis. If so, locate the point, and sort the temperatures detected by the second sensing fiber 4, the third sensing fiber 5, and the fourth sensing fiber 6. On the cross-section of the pipeline, the leak point is located in the first two optical fibers of the temperature. Between, and identify the leakage of the heat insulation layer 8, the computer 1 gives a report on the location of the leakage point.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods, as long as various insubstantial improvements are adopted in the method concept and technical solutions of the present invention, or there is no improvement Directly applying the conception and technical solutions of the present invention to other occasions falls within the protection scope of the present invention.

Claims (9)

1. A device for monitoring and locating the leakage point of a direct-buried thermal pipeline. The thermal pipeline is provided with a thermal insulation layer. It is characterized in that: the device is provided with a computer, and the computer is connected to a sensing optical fiber through an optical fiber sensing module. A sensing optical fiber extends between the thermal pipe and the thermal insulation layer. 2. The device for monitoring and locating leakage points of directly buried thermal pipelines according to claim 1, characterized in that there are at least three sensing optical fibers arranged at equal intervals between the thermal pipeline and the heat insulation layer. 3. The device for monitoring and locating leakage points of directly buried thermal pipelines according to claim 1 or 2, characterized in that: the thermal insulation layer is provided with a first sensing optical fiber connected to an optical fiber sensing module, and the The first sensing optical fiber is arranged along the heat insulation layer and has a distance from the heat insulation layer. 4. The device for monitoring and locating the leakage point of a direct-buried thermal pipeline according to claim 3, characterized in that: there are three sensing optical fibers extending between the thermal pipeline and the heat insulation layer, which are respectively the second sensor Optical fiber The third sensing optical fiber and the fourth sensing optical fiber, the three sensing optical fibers have an inverted equilateral triangle cross-section and are arranged between the heat pipe and the heat insulating layer. 5. The device for monitoring and locating leakage points of direct-buried thermal pipelines according to claim 4, characterized in that: the heat insulation layer is provided with a discharge point at intervals, and the discharge points are located on the lower surface of the heat insulation layer or diagonally above. 6. The device for monitoring and locating leakage points of directly buried thermal pipelines according to claim 5, wherein the first sensing optical fiber is located directly above the heat insulating layer, and the distance from the heat insulating layer is 8-12 cm. 7. A control method for a device for monitoring and locating leakage points of directly buried thermal pipelines according to claims 1-6, characterized in that: Step 1. Start measurement; Step 2, collecting the temperature between the thermal pipeline and the insulation layer; Step 3, comparing the collected temperature with a preset threshold; Step 4. If it is less than the threshold, return to step 2; if it is greater than the threshold, it is determined that there is a leak; Step 5, obtaining the optical fiber position points greater than the preset threshold; Step 6: Output the leak report. 8. The control method according to claim 7, characterized in that: The step 2 collects the temperature outside the insulation layer at the same time; The step 3 compares the collected temperature outside the insulation layer with a preset threshold; The step 4 determines at the same time, if the temperature outside the insulation layer is greater than the preset threshold, it is determined that the insulation layer has leaks, and if the temperature outside the insulation layer is lower than the preset threshold, it is determined that there is no leakage in the insulation layer. 9. The control method according to claim 7 or 8, characterized in that: in step 5, the temperature detected by the thermal pipeline and the thermal insulation layer sensing fiber is sorted, and the leak point is located in the top two sensing fibers of temperature between.