Converging and discharging structure for accumulated liquid in natural gas long-distance pipeline
By adopting high and low-level interface structures and pipe cleaning components in the natural gas long-distance pipeline, the problem of difficulty in confluence of liquid accumulation in the horizontal pipe section is solved, and the automatic collection and elimination of liquid accumulation is achieved, the construction difficulty and pipeline pressure drop are reduced, and the pipe cleaning efficiency is improved.
Patent Information
- Application Number
- CN202422513735.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-10-17
AI Technical Summary
In the prior art, it is difficult for the liquid accumulation in the horizontal pipe section to automatically flow into the pipe cleaning, which makes it difficult to handle the pipe cleaning, and the installation and construction of the special-shaped pipe is difficult and the pressure of the conveying pipeline is increased.
The high and low-level interface structure is used to form a fold line undulation with a certain inclined angle. Combined with the cleaning pipe assembly and floating cylinder control, the automatic collection and elimination of liquid accumulation is achieved, and the internal pressure of natural gas is used to improve fluidity and reduce viscosity and blockage.
Automatic collection and elimination of fluid accumulation is achieved, construction difficulty and pipeline pressure drop are reduced, pipe cleaning efficiency is improved, and construction costs and pressure increase are reduced.
Smart Images
Figure CN223121209U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of long-distance natural gas transportation, in particular to a liquid accumulation confluence and exclusion structure in a long-distance natural gas pipeline. Background Technique
[0002] When transporting natural gas through pipelines, due to the influence of the external environment on the temperature and pressure along the pipeline, the free water and heavy hydrocarbon components in natural gas change from the gas phase to the liquid phase and precipitate in the pipeline at a relatively low position, increasing the pressure of the natural gas in this section. Especially in the transportation section with a relatively low climate temperature, the liquid accumulation phenomenon is more obvious.
[0003] For undulating pipe sections, generally, the accumulated liquid will automatically confluence to the low position of the pipeline, and it can be removed by pigging at the pipe interface position regularly. However, for horizontal pipe sections, because the pipeline is relatively horizontal during construction and installation, the accumulated liquid is difficult to automatically confluence in the pipe, so the pigging treatment is much more difficult. In the prior art, there are ways to make the accumulated liquid confluence and discharge automatically by adding special-shaped pipes at the low position, but the installation and construction of special-shaped pipes are difficult, and too many special-shaped pipelines also significantly increase the pressure of the transportation pipeline and reduce the transportation efficiency. Content of the Utility Model
[0004] The purpose of the utility model is to provide a liquid accumulation confluence and exclusion structure in a long-distance natural gas pipeline to solve the problem that the accumulated liquid in the pipeline is difficult to automatically confluence and pigging in the horizontal pipe section proposed in the above background technique.
[0005] To achieve the above purpose, the utility model provides the following technical scheme:
[0006] A liquid accumulation confluence and exclusion structure in a long-distance natural gas pipeline includes a long-distance pipeline and a low-position pipe interface structure. The low-position pipe interface structure is located at the other end of the long-distance pipeline and includes a wedge-shaped pipe with a narrow upper part and a wide lower part, and the wedge-shaped pipe is connected to the flange of the long-distance pipeline.
[0007] The bottom of the low-position pipe interface structure is provided with an outlet hole and an inlet hole penetrating its wall surface, and a pigging component is arranged outside the low-position pipe interface structure. The pigging component includes an inner cavity, and an inlet and an outlet are respectively arranged on both sides of the inner cavity. The inlet and the outlet are respectively connected with an inlet pipe and an outlet pipe. The inlet pipe is connected with the outlet hole, and the outlet pipe is connected with the inlet hole. A riser is also arranged in the inner cavity. A through hole is arranged on the side surface of the riser. The bottom end of the riser is connected with a discharge port, and a floating cylinder slidably connected with the riser up and down is arranged on the riser.
[0008] As a further scheme of the utility model: a high-position pipe interface structure is also included. The high-position pipe interface structure includes a wedge-shaped ring with a wide upper part and a narrow lower part, and the wedge-shaped ring is connected to the flange of the long-distance pipeline. Both ends of a group of long-distance pipelines are respectively connected with the high-position pipe interface structure and the low-position pipe interface structure.
[0009] As a further solution of the utility model: the discharge port is connected to a collection bucket through a pipeline.
[0010] As a further solution of the utility model: an operation hole with a cover is arranged on the collection bucket.
[0011] As a further solution of the utility model: an openable sealing hole is further arranged on the side surface of the bottom end of the inner cavity.
[0012] As a further solution of the utility model: the outlet is further connected to a sampling port.
[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0014] 1. After being connected through the high-low position interface structure, the utility model forms a zigzag undulation with a specific inclination angle. The undulation angle is small and can realize automatic collection of accumulated liquid, and has little influence on the pipeline pressure drop.
[0015] 2. The high-low position interface structure is directly arranged at the flange connection position of the two pipes, and the installation is simple and will not significantly increase the construction cost.
[0016] 3. The accumulated liquid is automatically discharged through the pigging component, and the pressure in the natural gas pipeline is used to improve the fluidity of the accumulated liquid, reducing the phenomenon of accumulated liquid sticking and blocking. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic structural diagram of the utility model.
[0018] Figure 2 It is a schematic structural diagram of the high-position pipe interface structure in the utility model.
[0019] Figure 3 It is a schematic structural diagram of the low-position pipe interface structure in the utility model.
[0020] Figure 4 It is a schematic structural diagram of the pigging component in the utility model.
[0021] In the figure, 1. long-distance pipeline; 11. flange; 2. high-position pipe interface structure; 21. wedge ring; 3. low-position pipe interface structure; 31. wedge pipe; 311. outlet hole; 312. inlet hole; 4. pigging component; 41. inlet pipe; 42. outlet pipe; 43. inlet; 44. outlet; 441. sampling port; 45. inner cavity; 451. floating cylinder; 46. riser pipe; 461. through hole; 47. discharge port; 48. sealing hole; 5. collection bucket; 51. operation hole. DETAILED DESCRIPTION OF THE INVENTION
[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0023] Please refer to Figures 1 to 3 , in the embodiment of the present invention, a liquid accumulation confluence exclusion structure in a long-distance natural gas pipeline includes a long-distance pipeline 1, a high-position pipe interface structure 2, and a low-position pipe interface structure 3. The high-position pipe interface structure 2 and the low-position pipe interface structure 3 are respectively connected to both ends of the long-distance pipeline 1. Specifically, the high-position pipe interface structure 2 includes a wedge ring 21 that is wider at the top and narrower at the bottom, and is provided with an assembly hole that penetrates and can be connected to the flange 11 of the long-distance pipeline 1, and can be connected to the flange 11 through bolts. Both sides of the wedge ring 21 are respectively connected to a group of long-distance pipelines 1, making the pipelines on both sides in an inverted "V" shape; the low-position pipe interface structure 3 is located at the other end of the long-distance pipeline 1, and includes a wedge pipe 31 that is narrower at the top and wider at the bottom. Similarly, the wedge pipe 31 is connected and installed to the flanges 11 on both sides through the assembly holes on it, making the pipelines on both sides in a "V" shape, that is, forming a low position at the low-position pipe interface structure 3. When the pipeline is constructed and installed, fixed brackets can be welded outside the wedge ring 21 and the wedge pipe 31, and the inclination angle of the long-distance pipeline 1 does not exceed 5°.
[0024] As Figure 3 , Figure 4 , a discharge hole 311 and an inlet hole 312 that penetrate its wall surface are provided at the bottom of the low-position pipe interface structure 3, and a pigging component 4 is provided outside the low-position pipe interface structure 3. The pigging component 4 includes an inner cavity 45 for temporarily storing liquid accumulation. An inlet 43 and an outlet 44 are respectively provided on both sides of the inner cavity 45. The inlet 43 and the outlet 44 are respectively connected to an inlet pipe 41 and an outlet pipe 42. The inlet pipe 41 is connected to the discharge hole 311, and the outlet pipe 42 is connected to the inlet hole 312; a riser pipe 46 is also provided in the inner cavity 45. A through hole 461 is provided on the side surface of the riser pipe 46. The bottom end of the riser pipe 46 is connected to a discharge port 47, and a floating cylinder 451 that is slidably connected to it up and down is provided on the riser pipe 46.
[0025] After the above-mentioned long-distance pipeline 1 is connected through the high-position pipe interface structure 2 and the low-position pipe interface structure 3, it forms a zigzag undulation with a certain inclination angle. The accumulated liquid in the pipelines on both sides of the low-position pipe interface structure 3 automatically gathers at the interface position and flows into the inner cavity 45 through the outlet hole 311. Initially, there is less accumulated liquid in the inner cavity 45, and the position of the floating cylinder 451 is low, blocking the through hole 461 on the riser pipe 46. The accumulated liquid is temporarily stored in the inner cavity 45, and part of the natural gas that escapes into the inner cavity 45 can return to the long-distance pipeline 1 through the inlet hole 312; when the liquid level of the accumulated liquid rises, it drives the floating cylinder 451 to move upward. When the liquid level of the accumulated liquid rises to a certain height, the through hole 461 opens, and the accumulated liquid flows out through the riser pipe 46 into the discharge port 47 until the through hole 461 is blocked by the floating cylinder 451 again, and the cycle repeats. The natural gas that escapes during the process of the accumulated liquid in the pipeline flowing into the inner cavity 45 can play a certain purging role and can purge the pipeline. Because the condensed water of natural gas contains other substances such as a certain amount of heavy oil components, it has a relatively large viscous resistance and poor fluidity. The escaping natural gas can increase the flow pressure and reduce the occurrence of pipe blockage; during the process of discharging the liquid in the inner cavity 45, part of the natural gas will also escape into the inner cavity 45 through the inlet hole 312, which is beneficial to increasing the pressure in the inner cavity 45 and playing a pressurizing role in discharging the liquid through the through hole 461; through the control of the floating cylinder 451, it can also play a good sealing role and avoid the leakage of natural gas.
[0026] The discharge port 47 is connected to a collection bucket 5 through a pipeline for collecting the accumulated liquid. The collection bucket 5 can be constructed by burying, and an uncovered operation hole 51 exposed outside is set. The pipeline maintenance unit regularly pumps out the accumulated liquid in the bucket through a sewage pump and other devices for centralized treatment.
[0027] An openable sealing hole 48 is also provided on the bottom side of the inner cavity 45 for removing impurities such as lumps in the inner cavity 45 after opening through the sealing hole 48; the outlet 44 is also connected to a sampling port 441 which can be used to sample and test the natural gas, and sampling can be carried out without additionally setting a sampling pipe elsewhere.
[0028] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0029] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A liquid accumulation confluence and drainage structure in a long-distance natural gas pipeline, comprising a long-distance pipeline (1) and a low-position pipe interface structure (3), characterized in that: The low-position pipe interface structure (3) is located at the other end of the long-distance pipeline (1), and it includes a wedge-shaped pipe (31) with a narrow upper part and a wide lower part. The wedge-shaped pipe (31) is connected to the flange (11) of the long-distance pipeline (1). An outlet hole (311) and an inlet hole (312) penetrating through its wall surface are arranged at the bottom of the low-position pipe interface structure (3), and a pigging component (4) is arranged outside the low-position pipe interface structure (3). The pigging component (4) includes an inner cavity (45). An inlet (43) and an outlet (44) are respectively arranged on both sides of the inner cavity (45). The inlet (43) and the outlet (44) are respectively connected with an inlet pipe (41) and an outlet pipe (42). The inlet pipe (41) is connected with the outlet hole (311), and the outlet pipe (42) is connected with the inlet hole (312). A riser pipe (46) is further arranged in the inner cavity (45). A through hole (461) is arranged on the side surface of the riser pipe (46). The bottom end of the riser pipe (46) is connected with a discharge port (47). A floating cylinder (451) which is slidably connected with the riser pipe (46) up and down is arranged on the riser pipe (46).
2. The liquid accumulation confluence elimination structure in a long-distance natural gas pipeline according to claim 1, wherein: It further includes a high-position pipe interface structure (2). The high-position pipe interface structure (2) includes a wedge-shaped ring (21) with a wide upper part and a narrow lower part. The wedge-shaped ring (21) is connected to the flange (11) of the long-distance pipeline (1). The two ends of a group of long-distance pipelines (1) are respectively connected with the high-position pipe interface structure (2) and the low-position pipe interface structure (3).
3. The liquid accumulation confluence elimination structure in a long-distance natural gas pipeline according to claim 1, characterized in that: The discharge port (47) is connected to a collection barrel (5) through a pipeline.
4. A liquid accumulation confluence elimination structure in a long-distance natural gas pipeline according to claim 3, characterized in that: An operation hole (51) with a cover is arranged on the collection barrel (5).
5. The liquid accumulation confluence elimination structure in a long-distance natural gas pipeline according to claim 1, characterized in that: An openable sealing hole (48) is further arranged on the side surface at the bottom end of the inner cavity (45).
6. The liquid accumulation confluence elimination structure in a long-distance natural gas pipeline according to claim 1 or 5, characterized in that: The outlet (44) is connected with a sampling port (441).