CN113137530A

CN113137530A - Online leakage blocking device and method for gas pipeline

Info

Publication number: CN113137530A
Application number: CN202110493904.2A
Authority: CN
Inventors: 丁晓毅; 赵群新; 王涛; 卢爱忠
Original assignee: Jiangsu Yonggang Group Co Ltd
Current assignee: Jiangsu Yonggang Group Co Ltd
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2021-07-20

Abstract

The invention provides an online gas pipeline leakage stopping device and a leakage stopping method, which comprise the following steps: determining a leakage point of a gas pipeline by using a gas alarm, and primarily plugging the leakage point; splicing the sheet metal parts at the peripheries of the leakage points to form a wrapping box, and enabling at least one leakage point to be positioned in the wrapping box; the bottom of the packing box is communicated with a grouting machine through a conveying pipeline, and grouting is carried out in the packing box through the grouting machine until the slurry overflows from an observation port above the packing box; leveling the surface of the slurry, and detecting the concentration of the coal gas discharged from an observation port above the wrapping box; and after the slurry is cemented and solidified, using a gas alarm to check the gas concentration around the wrapping position of the pipeline again. The invention avoids the problem of secondary leakage caused by the reasons of poor welding technology of maintainers, limitation of common leakage stopping modes and the like; the maintenance risk of being in a coal gas area for a long time is reduced; and manpower and material resources for overhauling are greatly reduced.

Description

Online leakage blocking device and method for gas pipeline

Technical Field

The invention relates to the field of maintenance of dangerous pipelines, in particular to an online leakage blocking device and a leakage blocking method for a gas pipeline.

Background

The gas pipeline is a core component of the gas power generation equipment, is connected with equipment such as a valve, a turbine and the like, bears the transportation and transfer functions of a gas medium, and is a blood vessel of the gas power generation. When a gas pipeline leaks, the following problems occur:

1. the concentration of the gas around the gas equipment is increased and seriously exceeds the safety range, so that the risk of gas poisoning is increased;

2. the gas flow is reduced, and the recovery efficiency of the turbine on the residual pressure and the waste heat of the blast furnace gas in iron making is reduced.

Disclosure of Invention

The invention provides a gas pipeline online leakage stopping device and a leakage stopping method aiming at the defects in the prior art, and particularly relates to a gas pipeline online leakage stopping device and a leakage stopping method which can efficiently solve the problems when a gas pipeline leaks, and realize the synchronous operation of gas power generation equipment and the maintenance of the gas pipeline equipment. The problem of secondary leakage caused by the reasons of poor welding technology of maintainers, limitation of an ordinary plugging mode and the like is avoided; the maintenance risk of being in a coal gas area for a long time is reduced; and manpower and material resources for overhauling are greatly reduced.

The present invention achieves the above-described object by the following technical means.

An on-line leak stopping method for a gas pipeline comprises the following steps:

determining a leakage point of a gas pipeline by using a gas alarm, and primarily plugging the leakage point;

splicing the sheet metal parts at the peripheries of the leakage points to form a wrapping box, and enabling at least one leakage point to be positioned in the wrapping box;

the bottom of the packing box is communicated with a grouting machine through a conveying pipeline, and grouting is carried out in the packing box through the grouting machine until the slurry overflows from an observation port above the packing box;

leveling the surface of the slurry, and detecting the concentration of the coal gas discharged from an observation port above the wrapping box;

and after the slurry is cemented and solidified, using a gas alarm to check the gas concentration around the wrapping position of the pipeline again.

Further, the preliminary plugging of the leakage point specifically comprises the following steps:

cleaning the periphery of the leakage point;

and (5) plugging the leakage points by using mud-plugging magnet.

And further, welding the spliced wrapping box with the surface section of the gas pipeline, and sticking a tin foil adhesive tape to a gap which is not welded between the wrapping box and the surface of the gas pipeline.

A leakage blocking device of a gas pipeline online leakage blocking method comprises a grouting machine, a packing box and a gas alarm;

the gas alarm is used for detecting the concentration of gas around a gas pipeline and searching a leakage point;

the wrapping box is fixed on the outer side of the gas pipeline, and the leakage point is positioned in the wrapping box; the grouter is communicated with the packing box and is used for grouting in the packing box.

Further, the bottom of the wrapping box is provided with a grouting opening.

Further, the top of parcel box is equipped with the viewing aperture, the viewing aperture is higher than the leakage point.

The invention has the beneficial effects that:

1. the online gas pipeline leakage stopping method can reduce the welding workload and time caused by the traditional leakage stopping under pressure, and saves maintenance materials.

2. The online gas pipeline leakage stopping method is simple to operate, convenient to carry tools, suitable for all gas pipeline devices and free of limitation.

3. The online leakage stopping method for the gas pipeline greatly reduces the loss of residual pressure of gas flow. And the overhaul risk of a coal gas area is reduced.

4. According to the online gas pipeline plugging method, the idea of replacing the iron plate wrapping on the surface of the pipeline with the plugging slurry for rapidly filling and condensing in the cavities of the gas pipeline and the wrapping box is adopted, so that the online rapid plugging of the gas pipeline is realized.

Drawings

FIG. 1 is a front view of the online plugging device for gas pipelines according to the present invention.

Fig. 2 is a sectional view a-a of fig. 1.

Fig. 3 is a partially enlarged view B of fig. 2.

Fig. 4 is a partial enlarged view of C of fig. 2.

In the figure:

1-a packing box; 2-gas pipeline; and 3-grouting.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 and 2, the online gas pipeline leakage stoppage device comprises a grouting machine 3, a packing box 1 and a gas alarm; the gas alarm is used for detecting the gas concentration around the gas pipeline 2 and searching a leakage point; fig. 3 shows the leakage points.

The wrapping box 1 is fixed on the outer side of the gas pipeline 2, and the leakage point is positioned in the wrapping box 1; typically the wrap box 1 is made from a 10mm sheet metal splice. The shape and size of the wrapping box are determined according to the leakage position of the gas pipeline and the diameter of the gas pipeline. The box does not have fixed form and size, only needs to guarantee that the wrapping box can be reliably fixed at the leakage position of the gas pipeline, is usually positioned at the bottom, two sides and the top of the gas pipeline, and sometimes needs to avoid the position of a related valve, wherein the welding seam of the spliced wrapping box 1 does not need full welding, so to speak, section welding. The bottom of the packing box 1 is provided with a grouting opening, and fig. 3 is the grouting opening. The top of the wrapping box 1 is provided with an observation port, and the observation port is higher than a leakage point.

And the grouting machine 3 is communicated with the packing box 1 through a high-pressure slurry conveying pipe and is used for grouting in the packing box 1. The grouter 3 is controlled by a motor switch button, pressure can be adjusted according to user requirements, certain pressure is achieved, the grouter stops automatically, and the grouter has high safety. The high-pressure slurry conveying pipe comprises a high-pressure section and a conveying section, one end of the high-pressure section is connected with a discharge port of the grouting machine through a quick connector and a sealing ring connecting pressure gauge, and the other end of the high-pressure section is connected with the conveying section through a hydraulic connector; the conveying section is connected with a slurry injection port of the packing box through an injection needle. Wherein the length of the conveying section can be adjusted according to the requirement of a user.

The invention relates to a method for online leakage stoppage of a gas pipeline, which comprises the following steps:

s01, determining a leakage point of a gas pipeline 2 by using a gas alarm, removing medicine residues and iron rust around the leakage point by using a shovel blade, and performing primary plugging by using mud plugging iron absorption stones;

s02, measuring the size according to the position of the leakage point of the gas pipeline, designing the shape of a packing box, and requiring that the grouting material in the box can cover all the leakage points of the pipeline and be higher than the leakage points by a certain distance.

S03, the sheet metal parts are spliced into the wrapping box 1 at the periphery of the leakage point, the small gap between the wrapping box 1 and the gas pipeline 2 is ensured as far as possible, the spliced wrapping box 1 is welded with the surface section of the gas pipeline 2, and a tin foil adhesive tape is adhered to the gap which is not welded on the surfaces of the wrapping box 1 and the gas pipeline 2, so that the grouting material is prevented from losing from the gap when being poured at high pressure.

And S04, connecting the grouting machine 3 with the bottom of the packing box 1 through a high-pressure conveying pipeline to ensure that no slurry leakage occurs at each connecting part in the operation.

And S05, mixing water and grouting material according to a certain proportion as required, and uniformly stirring by using a stirrer to ensure the slurry dilution and no large particles in the slurry, so that the slurry is prevented from being blocked in a conveying pipeline.

And S06, pouring grouting material into a charging barrel of a grouting machine, starting a motor switch, and injecting the grouting material into the cavity of the packing box 1. And the slurry in the hopper is continuously supplemented in the grouting process.

And S07, stopping grouting until the slurry overflows from the observation port above the packing box 1. And (4) using a scraper knife to trowel the surface of the slurry, observing whether a blowing opening, bubbling and the like exist, and detecting the concentration of the on-site gas.

And S08, removing the grouting equipment, and checking the gas concentration around the wrapping position of the pipeline again by using a gas alarm after the slurry is cemented and cured.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. The online leakage blocking method for the gas pipeline is characterized by comprising the following steps of:

determining a leakage point of the gas pipeline (2) by using a gas alarm, and primarily plugging the leakage point;

splicing the peripheries of the leakage points into a packaging box (1) by using sheet metal parts, and enabling at least one leakage point to be positioned in the packaging box (1);

the bottom of the packing box (1) is communicated with a grouting machine (3) through a conveying pipeline, and grouting is performed in the packing box (1) through the grouting machine (3) until the slurry overflows from an observation port above the packing box (1);

leveling the surface of the slurry, and detecting the concentration of the coal gas discharged from an observation port above the wrapping box (1);

2. The method for on-line leakage stoppage of the gas pipeline according to claim 1, wherein the step of initially plugging the leakage point specifically comprises the steps of:

cleaning the periphery of the leakage point;

and (5) plugging the leakage points by using mud-plugging magnet.

3. The method for online leakage stoppage of the gas pipeline according to claim 1, wherein the spliced wrapping box (1) is welded with the surface section of the gas pipeline (2), and a tin foil adhesive tape is used for adhering to the gap which is not welded between the wrapping box (1) and the surface of the gas pipeline (2).

4. A plugging device for the online plugging method of the gas pipeline according to any one of the claims 1 to 3, which is characterized by comprising a grouting machine (3), a packing box (1) and a gas alarm;

the gas alarm is used for detecting the concentration of gas around the gas pipeline (2) and searching a leakage point;

the wrapping box (1) is fixed on the outer side of the gas pipeline (2), and the leakage point is positioned in the wrapping box (1); the grouting machine (3) is communicated with the packing box (1) and is used for grouting in the packing box (1).

5. The plugging device for the online plugging method of the gas pipeline according to claim 4, wherein the bottom of the wrapping box (1) is provided with a grouting port.

6. The plugging device for the online plugging method of the gas pipeline according to claim 4, wherein an observation port is arranged at the top of the wrapping box (1), and the observation port is higher than a leakage point.