A direct buried insulated steam pipe with pipeline leakage monitoring function

Abstract

The present invention relates to a directly buried insulated steam pipe with the function of monitoring pipeline leakage, comprising a working pipe, the edge of the outer wall of the working pipe is connected to an outer sleeve through a guide bracket, guide brackets connected to the outer sleeve are provided at intervals in the axial direction of the working pipe, and an insulation layer is provided outside the working pipe between two adjacent guide brackets, and the insulation layer is provided with flow guide holes along the axial direction of the pipeline, and the flow guide holes are vertically downward. A temperature measurement area is preset at the bottom of the outer sleeve, and the temperature measurement area is composed of a temperature measuring optical fiber, a threading sheath tube and a moisture absorption protective layer from the inside to the outside. A flexible partition barrier layer is provided on the guide bracket to fit the inner wall of the outer sleeve, and a closed cavity is formed between the outer edge of the insulation layer and the adjacent guide brackets and the inner wall of the outer sleeve. Beneficial effect: The present invention solves the problem that the reliability, sensitivity and positioning accuracy of leakage monitoring of previous products of this type are not up to practical application, and avoids the resulting inability to stop damage in time and the possibility of causing serious safety accidents.

Description

Technical Field

[0001] The invention relates to the technical field of steam pipe devices, and in particular to a directly buried thermal insulation steam pipe with a pipeline leakage monitoring function. Background Art

[0002] Effective leakage monitoring of municipal heating steam pipelines laid by direct burial has been a difficult problem that needs to be solved in the industry for many years. Its effective solution is of great significance to the safety and economy of the pipeline network.

[0003] Since the mainstream of the current direct buried insulated steam pipe adopts a steel jacket steel double-layer composite pipe structure (steel trench), damage to the inner and outer steel pipes can cause pipeline leakage, so the monitoring and judgment of its leakage (seepage) status is more complicated. According to a large number of destructive experiments we have conducted, when steam leaks at a certain point in the inner pipe, due to the loose structure of multiple gaps caused by the layered and multi-section wrapping connection of the insulation layer, the steam quickly breaks through the weak resistance point in the insulation layer under the action of internal pressure and enters the cavity between the inner pipe and the outer sleeve and diffuses axially, which is extremely random. It constantly encounters resistance points along the way and partially refluxes many times, resulting in a very chaotic axial distribution of the temperature field at both ends of the cavity with the leakage point as the origin. When a small amount of groundwater initially penetrates into the cavity between the inner and outer pipes through the damaged part of the outer sleeve due to corrosion, it will gradually gasify at high temperature and slowly discharge from the dehumidification pipe. As the corrosion surface of the outer sleeve gradually expands, the amount of infiltrated water also gradually increases and corrodes the inner wall of the outer sleeve from the inside to the outside, resulting in an increase in the overall corrosion of the pipeline.

[0004] The current steam pipeline network direct buried pipeline leakage (seepage) monitoring is generally achieved by setting moisture drainage holes on the pipeline, but its real-time, reliability, sensitivity and positioning accuracy do not meet the requirements of actual use, thus bringing great safety hazards. This technology can effectively solve this problem and avoid the resulting failure to timely discover, repair and stop losses, which may lead to serious safety accidents. Summary of the invention

[0005] The purpose of the present invention is to provide a direct-buried insulated steam pipe with a pipeline leakage monitoring function, which has high monitoring sensitivity and positioning accuracy, good safety performance, and is easy to install and maintain, and is achieved through the following scheme.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: a directly buried insulated steam pipe with a function of monitoring pipeline leakage (seepage) in combination with a DTS system, comprising a working pipe, the outer wall edge of the working pipe is connected to an outer sleeve through a guide bracket (the non-bracket part is an insulation layer), characterized in that a guide bracket connected to the outer sleeve is provided at intervals in the axial direction of the working pipe, an insulation layer is provided outside the working pipe between two adjacent guide brackets, the insulation layer is provided with a guide hole along the axial direction of the pipeline, the guide hole points vertically downward (in the direction of gravity) to a temperature measurement area preset at the bottom of the outer sleeve (in the direction of gravity), the temperature measurement area is composed of a temperature measurement optical fiber, a threading sheath tube and a moisture absorption protective layer from inside to outside, a flexible partition barrier layer is provided on the guide bracket to fit the inner wall of the outer sleeve, a closed cavity is formed between the outer edge of the insulation layer and the adjacent guide bracket (including the flexible partition barrier layer) and the inner wall of the outer sleeve, and the temperature measurement optical fiber in the temperature measurement (optical fiber) area is connected to the DTS system host.

[0007] Furthermore, the DTS system host includes a fiber optic sensor analyzer connected to the temperature measuring optical fiber, and the output ends of the fiber optic sensor analyzer are respectively connected to a liquid crystal display, a remote control terminal, a text message alarm and an audible and visual alarm. The fiber optic sensor analyzer is used to collect optical signals and convert them into temperature signals.

[0008] Furthermore, one end of the optical fiber sensing analyzer is provided with a pipeline channel connected to the temperature measuring optical fiber.

[0009] Furthermore, the temperature measuring optical fiber is provided with a threading sheath tube outside and buried in the moisture absorbing protective layer.

[0010] Furthermore, the guide bracket is axially arranged inside the outer sleeve according to a certain distance requirement, and an annular flexible partition barrier is provided thereon and connected to the inner wall of the outer sleeve, so that a closed cavity is formed between two adjacent guide brackets.

[0011] The technical effects of the present invention are:

[0012] ①This type of pipeline is designed through structural optimization and combined with the DTS monitoring system to achieve the functions of real-time monitoring of internal pipe leakage and external pipe leakage of this type of pipeline and locating the leakage (seepage) point. It solves the problem that the reliability, sensitivity and positioning accuracy of the previous products of this type that realize pipeline leakage (seepage) monitoring by setting moisture drainage holes are not up to the actual requirements, avoiding the resulting inability to stop repairs and losses in time and the possibility of causing serious safety accidents.

[0013] ②The DTS system host can accommodate up to 8 channels and can monitor 8 pipelines in real time at the same time. The longest monitoring distance of a single pipeline is about 10km, and it can be expanded and networked to achieve overall real-time monitoring of the buried steam pipeline network. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional view in the front view direction of a directly buried insulated steam pipe with a pipeline leakage monitoring function according to the present invention;

[0015] Figure 2 It is a schematic cross-sectional view from the right side of a directly buried insulated steam pipe with a pipeline leakage monitoring function according to the present invention;

[0016] Figure 3 This is a schematic diagram of the host connection of the DTS system of the present invention.

[0017] Figure numerals: 1-working tube; 2-insulation layer; 3-outer sleeve; 4-guide bracket; 5-flow guide hole; 6-temperature measurement area; 7-hygroscopic protective layer; 8-sealed cavity; 9-flexible partition barrier layer; 10-temperature measurement optical fiber; 11-DTS system host; 12-threading sheath tube. DETAILED DESCRIPTION

[0018] See attached Figure 1-3 A directly buried insulated steam pipe with a function of monitoring pipeline leakage comprises a working pipe 1, the outer wall edge of the working pipe 1 is connected to an outer sleeve 3 through a guide bracket 4, an insulation layer 2 is arranged outside the working pipe between two adjacent guide brackets, and the insulation layer 2 is provided with a guide hole 5 along the pipeline axis direction, and the guide hole 5 points vertically downward (in the direction of gravity) to a temperature measurement area 6 preset at the bottom (in the direction of gravity) of the outer sleeve 3. From the inside to the outside of the temperature measurement area 6 are a temperature measurement optical fiber 10, a threading sheath tube 12 and a moisture absorption protective layer 7. The guide bracket 4 is provided with a flexible partition barrier layer 9 that fits the inner wall of the outer sleeve 3. An enclosed cavity 8 is formed between the outer sleeve 3 and the insulation layer 2 and the flexible partition barrier 9 arranged on the adjacent guide bracket 4, and the temperature measuring optical fiber 10 in the temperature measuring area 6 is connected to the DTS system host 11. The DTS system host 11 includes an optical fiber sensor analyzer connected to the temperature measuring optical fiber 10. The output ends of the optical fiber sensor analyzer are respectively connected to a liquid crystal display, a remote control end, a text message alarm and an audible and visual alarm. The optical fiber sensor analyzer is used to collect optical signals and convert them into temperature signals. One end of the optical fiber sensor analyzer is provided with a pipeline channel connected to the temperature measuring optical fiber 10.

[0019] The specific embodiment of this scheme is that when the working pipe 1 is damaged and causes steam leakage, the steam flows out along the guide hole 5 in the insulation layer 2 (pointing vertically downward to the temperature measuring optical fiber area preset at the bottom of the outer protective tube), and in a short time, it is gathered and fixed in the closed cavity 8 formed by the two guide brackets 4 and the flexible partition barrier layer 9 arranged thereon and the outer sleeve 3, causing the temperature of this section of the tube cavity to rise rapidly. The temperature measuring optical fiber 10 passing through this area measures the sudden increase in temperature and transmits the signal to the DTS system host 11, and the system issues an alarm prompt and locates the (axial) leakage point. When groundwater leakage occurs at any point of the outer protective steel casing (cross section), due to the action of gravity, the water leaks into the tube cavity and gathers at the bottom of the outer sleeve 3 and is adsorbed on the hygroscopic protective layer 7 covering the outer surface of the temperature measuring optical fiber 10 (the protective layer is also divided into sections (about 1m / section), and the temperature of the temperature measuring optical fiber 10 passing through this area suddenly decreases and transmits the signal to the DTS system host 11, and the system issues an alarm prompt and locates the (axial) leakage point.

[0020] In a specific embodiment of the present scheme, the optical fiber sensor analyzer in the DTS system host 11 is used to collect optical signals and convert them into temperature signals, and then process the data and display them on a display screen. When the data or its rate of change exceeds a certain threshold, such as temperature, an alarm function can be realized in time through text messages or sound and light.

[0021] Preferably, the guide bracket 4 and the flexible partition baffle 9 arranged thereon are fitted inside the outer sleeve 3, and the axial spacing between adjacent guide brackets 4 meets relevant design requirements, and the temperature measuring optical fiber 10 is provided with an optical fiber threading sheath tube 12 and an external moisture-absorbing protective layer 7.

[0022] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A directly buried insulated steam pipe with a pipeline leakage monitoring function, comprising a working pipe (1), wherein the outer wall edge of the working pipe (1) is connected to an outer sleeve (3) via a guide bracket (4), characterized in that: Guide brackets (4) connected to the outer sleeve (3) are provided at intervals on the axial direction of the working tube (1); an insulation layer (2) is provided outside the working tube (1) between two adjacent guide brackets (4); the insulation layer (2) is provided with flow guide holes (5) along the axial direction of the pipeline; the flow guide holes (5) are vertically downwardly directed; a temperature measurement area (6) is preset at the bottom of the outer sleeve (3); the temperature measurement area (6) comprises a temperature measurement optical fiber (10), a threading sheath tube (12) and a moisture absorption protective layer (7) from inside to outside; a flexible partition barrier layer (9) is provided on the guide bracket (4) and is attached to the inner wall of the outer sleeve (3); a closed cavity (8) is formed between the outer edge of the insulation layer (2) and the adjacent guide brackets (4) and the inner wall of the outer sleeve (3); and the temperature measurement optical fiber (10) in the temperature measurement area (6) is connected to a DTS system host (11); The DTS system host (11) comprises an optical fiber sensor analyzer connected to the temperature measuring optical fiber (10), the output end of the optical fiber sensor analyzer is respectively connected to a liquid crystal display screen, a remote control terminal, a fire controller, a short message alarm and an audible and visual alarm, and the optical fiber sensor analyzer is used to collect optical signals and convert them into temperature signals; One end of the optical fiber sensing analyzer is provided with a pipeline channel connected to the temperature measuring optical fiber (10); The guide bracket (4) is arranged in a ring shape inside the outer sleeve (3), and the spacing between adjacent guide brackets (4) is equal.

2. The directly buried insulated steam pipe with the function of monitoring pipeline leakage according to claim 1 is characterized in that: The temperature measuring optical fiber (10) is provided with a threading sheath tube (12) outside and is buried in the moisture absorbing protective layer (7).

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