CN111895273A - Gas pipeline leakage tracing method - Google Patents
Gas pipeline leakage tracing method Download PDFInfo
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- CN111895273A CN111895273A CN202010749188.5A CN202010749188A CN111895273A CN 111895273 A CN111895273 A CN 111895273A CN 202010749188 A CN202010749188 A CN 202010749188A CN 111895273 A CN111895273 A CN 111895273A
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- gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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Abstract
The invention relates to the technical field of gas safety monitoring, in particular to a gas pipeline leakage tracing method. If the gas monitoring device detects the leakage of the gas pipeline, acquiring a target pipe section where a leakage source on the gas pipeline is located according to the farthest diffusion distance of the gas and the position of the gas monitoring device; acquiring a gas diffusion area where a target pipe section is located according to the farthest diffusion distance between the target pipe section and the medium where the target pipe section is located; and acquiring a gas leakage source on the target pipe section according to the gas concentration and the farthest diffusion distance of the gas in the medium in the diffusion area. The leakage tracing method firstly determines a target pipe section where a leakage source is located, and then further shortens the length of the target pipe section until the specific position of the leakage source is determined. Therefore, the leakage tracing method can position the leakage source on a short target pipe section, thereby improving the positioning accuracy of the leakage source position and facilitating the maintenance department to repair the leaked gas pipeline in time.
Description
Technical Field
The invention relates to the technical field of gas safety monitoring, in particular to a gas pipeline leakage tracing method.
Background
The gas pipeline leads to the gas to leak because factors such as pipeline account for pressure, degradation, ageing, natural disasters and artificial destruction, and when the gas leaked the gas concentration that makes the gas pipeline outside reached a definite value, in case meet the burning things which may cause the explosion in case to bring the potential safety hazard for the resident near the gas pipeline.
The existing gas pipeline leakage tracing method has inaccurate positioning of a leakage source.
Disclosure of Invention
In order to solve the technical problem, the invention provides a gas pipeline leakage tracing method which can improve the positioning accuracy of a leakage source on a gas pipeline.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas pipeline leakage tracing method comprises the following steps:
s1, if the gas monitoring device detects that the gas pipeline leaks, acquiring a target pipe section where a leakage source on the gas pipeline is located according to the farthest diffusion distance of the gas and the position of the gas monitoring device, wherein the farthest diffusion distance of the gas is the farthest diffusion distance of the gas in a medium between the gas pipeline and the gas monitoring device;
s2, acquiring a gas diffusion area where the target pipe section is located according to the farthest diffusion distance between the target pipe section and the medium where the target pipe section is located;
and S3, collecting the gas concentration at any point in the gas diffusion area, and acquiring a gas leakage source on the target pipe section according to the gas concentration and the farthest diffusion distance of the gas in the medium in the diffusion area.
Further, the specific steps of step S1 are: drawing a circle C by taking the gas monitoring device as a circle center O and the farthest diffusion distance R of the gas in a medium between the gas pipeline and the gas monitoring device as a radiusOGas line and circle COThe intersected part is a target pipe section;
the formula for R is as follows:
if the number of the types of the media between the gas pipeline and the gas monitoring device is equal to 1, and the farthest diffusion distance of the gas in the media is RmThen R ═ Rm；
If the number of the types of the media between the gas pipeline and the gas monitoring device is more than 1, then
Wherein n is the number of types of media between the gas pipeline and the gas monitoring device, LiIs the length of the i-th medium from the gas pipeline to the gas monitoring device along the direction of the perpendicular of the gas monitoring device and the gas pipeline, RiThe gas monitoring device is positioned at the position of the nth medium, R is the farthest diffusion distance of the gas in the ith mediumnThe farthest diffusion distance of the fuel gas in the nth type medium.
Further, the gas diffusion area in step S2 includes an area swept by a circle with a radius R on the side of the target pipe section facing the gas monitoring device with each point on the target pipe section as a center of circle, and an area swept by a circle with a radius R on the side of the target pipe section facing away from the gas monitoring device with each point on the target pipe section as a center of circle; r is the farthest diffusion distance of the gas in the medium on the side of the target pipe section facing away from the gas monitoring device.
Further, the specific steps of step S3 are as follows:
taking any point of the gas diffusion area as a circle center, drawing a circle by using a radius R ', if the gas concentration at the point is zero, marking the circle as C ', otherwise, marking the circle as C ", wherein R ' is the farthest diffusion distance of the gas in a medium between the point and the target pipe section;
the part of the target pipe section, which is overlapped with all the circles C' is a high-leakage-probability gas pipe section, namely the pipe section where the gas leakage source is located.
Further preferably, the gas monitoring device is arranged in an inspection well on one side of the gas pipeline, the gas monitoring device comprises a combustible gas sensor and an alarm device electrically connected with the combustible gas sensor, and the combustible gas sensor and the gas pipeline are arranged in the same horizontal plane.
Further preferably, the gas pipeline comprises pipeline segments arranged in sequence, and the projection of the combustible gas sensor on the gas pipeline is positioned at the joint of the two pipeline segments.
Further preferably, the medium between the gas pipeline and the gas monitoring device comprises green belts and/or road plate bricks and/or a mixture of cement and asphalt.
The invention has the following beneficial effects:
(1) the leakage tracing method firstly determines a target pipe section where a leakage source is located, and then further shortens the length of the target pipe section until the specific position of the leakage source is obtained. Therefore, the leakage tracing method can position the leakage source on a short target pipe section, thereby improving the positioning accuracy of the leakage source position and facilitating the maintenance department to repair the leaked gas pipeline in time.
(2) The invention uses the combustible gas sensor of the gas monitoring device as the center of a circle and the farthest diffusion distance as the radius to draw a circle, the intersection part of the gas pipeline and the circle is the target pipe section where the leakage source is located, and other parts of the gas pipeline are marked as non-target pipe sections. The invention takes the farthest diffusion distance as the radius, can ensure that the leakage source is locked on the defined target pipe section, and prevent the leakage source from being locked on a non-target pipe section, thereby providing guarantee for subsequent leakage source positioning.
(3) The invention provides a quantitative calculation formula of the farthest diffusion distance, which is convenient for field maintenance personnel to accurately calculate the farthest diffusion distance, thereby improving the accuracy of the obtained target pipe section and finally realizing the accurate positioning of the position of a leakage source.
(4) The method comprises the steps of collecting the gas concentration at any point in a gas diffusion area, if the gas concentration at the point is zero, drawing a circle by taking the point as the center of circle and the farthest diffusion distance of the gas in a medium between the point and a target pipe section as a radius, wherein the part of the target pipe section, which is positioned inside the circle, is a low-leakage-probability gas pipeline, namely a leakage source is large and can not be positioned on the pipeline. Therefore, the leakage source locating device can quickly locate the leakage pipe section where the leakage source is located by collecting the gas concentration in the gas diffusion area where the target pipe section is located, so that the leakage source can be quickly and accurately located.
(5) The butt joint of two adjacent pipeline sections on the gas pipeline is easy to cause gas leakage. The combustible gas sensor is arranged at the butt joint of two adjacent pipeline sections, so that whether gas leakage occurs in the gas pipeline can be monitored in a targeted manner, and the accuracy of positioning a leakage source is further improved.
(6) Different mediums are covered around the gas pipeline, which results in different farthest diffusion distances of the gas. Therefore, when the farthest diffusion distance is calculated, the medium type is used as a reference factor, the calculated farthest diffusion distance can be made to accord with the farthest diffusion distance of actual fuel gas, and the accuracy of the position of the leakage source obtained according to the farthest diffusion distance is further improved.
(7) The combustible gas sensor and the gas pipeline are arranged on the same horizontal plane, so that the farthest diffusion distance can be conveniently and actually measured by field maintenance personnel.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of the present invention for obtaining a target pipe segment;
FIG. 3 is a schematic view of the gas diffusion region of the present invention;
FIG. 4 is a schematic diagram of the present invention for capturing the source of a leak.
Detailed Description
The technical scheme of the invention is clearly and completely described below by combining the embodiment and the attached drawings of the specification. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A gas pipeline leakage tracing method is shown in figure 1 and comprises the following steps:
s1, if the gas monitoring device detects a leakage of the gas pipeline, obtaining a target pipe section where a leakage source on the gas pipeline is located according to a farthest diffusion distance of the gas and a position of the gas monitoring device, where the farthest diffusion distance of the gas is a farthest diffusion distance of the gas in a medium between the gas pipeline and the gas monitoring device, in this embodiment, the farthest diffusion distance is a diffusion distance required by the concentration of the gas leaked from the gas pipeline to decrease to zero in the medium, and when the medium is fixed and the concentration of the gas in the gas pipeline is known, the farthest diffusion distance is a fixed value. The specific process is as follows:
in this embodiment, the gas monitoring device includes combustible gas sensor and the alarm device who is connected with combustible gas sensor electricity, and combustible gas sensor and gas pipeline are located the coplanar. As shown in FIG. 2, a circle C is drawn by taking a combustible gas sensor of the gas monitoring device as a center O and the farthest diffusion distance R of the gas in a medium between a gas pipeline and the gas monitoring device as a radiusOGas line and circle COThe intersecting portion is the target pipe segment.
The formula for R is as follows:
if the number of types of media between the gas line and the gas monitoring deviceThe quantity is equal to 1 and the maximum diffusion distance of the gas in this type of medium is RmThen R ═ Rm；
If the number of the types of the media between the gas pipeline and the gas monitoring device is more than 1, then
Wherein n is the number of types of media between the gas pipeline and the gas monitoring device, LiIs the length of the i-th medium from the gas pipeline to the gas monitoring device along the direction of the perpendicular of the gas monitoring device and the gas pipeline, RiThe gas monitoring device is positioned at the position of the nth medium, R is the farthest diffusion distance of the gas in the ith mediumnThe farthest diffusion distance of the fuel gas in the nth type medium.
The medium comprises green belts, road plate bricks, a mixture of cement and asphalt and any combination of the three mediums. In this embodiment, the medium includes a green belt, a road plate brick, a mixture of cement and asphalt, which are sequentially arranged from the gas pipeline to the gas monitoring device, that is, the value of n in the formula (1) is 3. In the formula (1), the first and second groups,
the total length of n-1 mediums from the gas pipeline to the gas monitoring device along the direction of a perpendicular line between the gas monitoring device and the gas pipeline is shown,
indicating the distance the gas diffuses into the nth type of medium until the concentration of the gas in this type of medium decreases to zero.
And S2, acquiring the gas diffusion area where the target pipe section is located according to the farthest diffusion distance between the target pipe section and the medium where the target pipe section is located. The specific process is as follows:
and each point on the target pipe section is taken as a circle center, a circle is drawn by using the radius R, the circle is drawn in a first area swept by one side of the target pipe section facing the gas monitoring device, each point on the target pipe section is taken as a circle center, a circle is drawn by using the radius R, and the circle is swept in a second area swept by one side of the target pipe section away from the gas monitoring device. By adopting the method, the gas diffusion area is formed by an area swept by taking all points on the target pipe section as the circle center; r is the farthest diffusion distance of the gas in the medium on the side of the target pipe section facing away from the gas monitoring device. The gas diffusion area shown in fig. 3 is formed by the method, as can be seen from fig. 3, leakage occurs at any point on the target pipe section, and the diffusion range of the leaked gas is within the gas diffusion area.
And S3, collecting the gas concentration at any point in the gas diffusion area, and acquiring a gas leakage source on the target pipe section according to the gas concentration and the farthest diffusion distance of the gas in the medium in the diffusion area. The specific process is as follows:
and drawing a circle by taking any point of the gas diffusion area as a center and a radius R ', if the gas concentration at the point is zero, marking the circle as C ', otherwise, marking the circle as C ", wherein R ' is the farthest diffusion distance of the gas in the medium between the point and the target pipe section. Examples are: and (3) collecting the gas concentration at the position A in the gas diffusion area, wherein two mediums are arranged between the position A and the target pipe section, R 'is the farthest diffusion distance of the two mediums, the calculation formula is similar to the formula (1), and a circle with the center of A is marked as C'.
In this embodiment, three circles C ", one circle C' is drawn. The part of the target pipe section, which is intersected with all the three circles C' is a high-leakage-probability gas pipe section, namely the position of a gas leakage source.
In this embodiment, gas monitoring devices is located the inspection shaft of gas pipeline one side. The gas pipeline comprises pipeline segments which are arranged in sequence, and the projection of the combustible gas sensor on the gas pipeline is positioned at the butt joint of the two pipeline segments.
Claims (7)
1. A gas pipeline leakage tracing method is characterized by comprising the following steps:
s1, if the gas monitoring device detects that the gas pipeline leaks, acquiring a target pipe section where a leakage source on the gas pipeline is located according to the farthest diffusion distance of the gas and the position of the gas monitoring device, wherein the farthest diffusion distance of the gas is the farthest diffusion distance of the gas in a medium between the gas pipeline and the gas monitoring device;
s2, acquiring a gas diffusion area where the target pipe section is located according to the farthest diffusion distance between the target pipe section and the medium where the target pipe section is located;
and S3, collecting the gas concentration at any point in the gas diffusion area, and acquiring a gas leakage source on the target pipe section according to the gas concentration and the farthest diffusion distance of the gas in the medium in the diffusion area.
2. The gas pipeline leakage tracing method of claim 1, wherein the specific steps of step S1 are: drawing a circle C by taking the gas monitoring device as a circle center O and the farthest diffusion distance R of the gas in a medium between the gas pipeline and the gas monitoring device as a radiusOGas line and circle COThe intersected part is a target pipe section;
the formula for R is as follows:
if the number of the types of the media between the gas pipeline and the gas monitoring device is equal to 1, and the farthest diffusion distance of the gas in the media is RmThen R ═ Rm；
If the number of the types of the media between the gas pipeline and the gas monitoring device is more than 1, then
Wherein n is the number of types of media between the gas pipeline and the gas monitoring device, LiIs the length of the i-th medium from the gas pipeline to the gas monitoring device along the direction of the perpendicular of the gas monitoring device and the gas pipeline, RiThe gas monitoring device is positioned at the position of the nth medium, R is the farthest diffusion distance of the gas in the ith mediumnThe farthest diffusion distance of the fuel gas in the nth type medium.
3. The gas pipeline leakage tracing method of claim 2, characterized in that: the gas diffusion area in the step S2 includes an area swept by a circle formed by taking each point on the target pipe section as a center and a radius R on the side of the target pipe section facing the gas monitoring device, and an area swept by a circle formed by taking each point on the target pipe section as a center and a radius R on the side of the target pipe section facing away from the gas monitoring device; r is the farthest diffusion distance of the gas in the medium on the side of the target pipe section facing away from the gas monitoring device.
4. The gas pipeline leakage tracing method according to claim 3, wherein the specific steps of step S3 are as follows:
taking any point of the gas diffusion area as a circle center, drawing a circle by using a radius R ', if the gas concentration at the point is zero, marking the circle as C ', otherwise, marking the circle as C ", wherein R ' is the farthest diffusion distance of the gas in a medium between the point and the target pipe section;
the part of the target pipe section, which is overlapped with all the circles C' is a high-leakage-probability gas pipe section, namely the pipe section where the gas leakage source is located.
5. The gas pipeline leakage tracing method of any one of claims 1 to 4, wherein: the gas monitoring device is positioned in an inspection well on one side of the gas pipeline and comprises a combustible gas sensor and an alarm device electrically connected with the combustible gas sensor, and the combustible gas sensor and the gas pipeline are positioned in the same horizontal plane.
6. The gas pipeline leakage tracing method of claim 5, characterized in that: the gas pipeline comprises pipeline segments which are arranged in sequence, and the projection of the combustible gas sensor on the gas pipeline is positioned at the butt joint of the two pipeline segments.
7. The gas pipeline leakage tracing method of claim 5, characterized in that: the medium between the gas pipeline and the gas monitoring device comprises green belts and/or road plate bricks and/or a mixture of cement and asphalt.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112664839A (en) * | 2020-11-27 | 2021-04-16 | 合肥泽众城市智能科技有限公司 | Method and system for predicting and tracing combustible gas diffusion of communication pipeline |
| CN112880931A (en) * | 2021-01-13 | 2021-06-01 | 盐城墨韵电子科技有限公司 | Gas safety monitoring method and cloud monitoring platform based on synergistic effect of Internet of things and big data |
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