Hydrogen-doped natural gas pipeline anti-hydrogen embrittlement sealing connection device

Abstract

The utility model discloses a kind of hydrogen-doped natural gas pipeline anti-hydrogen embrittlement sealing connection devices, it is related to natural gas pipeline technical field, the device, including protective sleeve, protective sleeve is double petal shape and is wrapped in pipeline connection, the inside of the protective sleeve is located at pipeline connection and is established with main sealing ring, for closing the gap of pipeline connection;The inside of the main sealing ring is equipped with annular sealing cavity, the outside of the main sealing ring is equipped with sealing gas nozzle, the sealing gas nozzle is connected with the inside of annular sealing cavity, one end of the sealing gas nozzle is from protective sleeve and is worn, and sealing rubber plug cap is connected. By adopting the combination structure of double petal type protective sleeve and built-in chargeable main sealing ring, the all-around coating and active sealing of pipeline connection are realized, the fit sealing of sealing structure is guaranteed, continuous, dense and elastic sealing layer is formed at pipeline connection gap, and hydrogen permeation path is effectively blocked.

Description

Technical Field

[0001] This utility model relates to the field of natural gas pipeline technology, specifically to a hydrogen-blended natural gas pipeline anti-hydrogen embrittlement sealing connection device. Background Technology

[0002] With the transformation of the energy structure and the increasing demand for clean energy, the transportation technology of hydrogen-blended natural gas (that is, hydrogen is blended into natural gas in a certain proportion) is regarded as one of the important ways to achieve low-carbon energy utilization. However, hydrogen molecules are the smallest molecules in nature and have extremely strong permeability and diffusion, which poses an unprecedented challenge to the sealing of the transportation pipelines, especially the connection between pipelines, such as flanges and threaded connections, which are the parts with the highest risk of leakage. Existing pipeline connection sealing methods, such as flange gasket sealing relying solely on bolt preload or single elastic sealing rings, may fail under hydrogen-blended natural gas conditions due to hydrogen permeation, pressure fluctuations, temperature changes, or slight pipeline displacement. Once a leak occurs, it not only causes energy waste and economic losses but also poses significant safety hazards. Therefore, we propose a hydrogen embrittlement-proof sealing connection device for hydrogen-blended natural gas pipelines. Utility Model Content

[0003] This invention provides a hydrogen-embrittlement-proof sealing connection device for hydrogen-blended natural gas pipelines, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a hydrogen embrittlement prevention sealing connection device for hydrogen-blended natural gas pipelines, including a protective sleeve, the protective sleeve being double-lobed and wrapped around the pipeline connection, and a main sealing ring being provided on the inner side of the protective sleeve at the pipeline connection for sealing the gap at the pipeline connection. The main sealing ring has an annular sealing cavity inside, and a sealing nozzle is installed on the outside of the main sealing ring. The sealing nozzle is connected to the inside of the annular sealing cavity. One end of the sealing nozzle passes through the protective sleeve and is connected to a sealing rubber plug cap.

[0005] Preferably, the main sealing ring is located in the middle of the protective sleeve.

[0006] Preferably, the protective sleeves are combined to form a complete tubular shape, and a concave groove is provided at the connection between the two protective sleeves, with a sealing rubber gasket inside the groove.

[0007] Preferably, pipe clamps are bolted to both ends of the protective sleeve, and the two pipe clamps are respectively circularly and movably fitted onto the outside of the pipe.

[0008] Preferably, the inner surface of the pipe clamp that contacts the pipe is provided with an anti-slip pad.

[0009] Preferably, baffles are installed at both ends of the outer side of the protective sleeve, and sliding pressure rings are movably sleeved at both ends of the protective sleeve, with the two sides of the sliding pressure rings abutting against the pipe clamp and the baffles, respectively. The sliding pressure ring is hinged to a telescopic support frame on its outer side.

[0010] Preferably, the telescopic support frame includes an outer tube and an inner threaded rod; One end of the outer sleeve is hinged to the outside of the sliding pressure ring, and one end of the inner screw is located inside the end of the outer sleeve away from the sliding pressure ring and is threadedly connected to it.

[0011] Preferably, the inner side of the pipe clamp forms a stepped sealing structure on the inner side of the end of the protective sleeve, and a main sealing ring is provided therebetween, the main sealing ring abutting against the outer side of the protective sleeve, the pipe clamp and the pipe respectively.

[0012] This utility model has the following beneficial effects: 1. This hydrogen-blended natural gas pipeline anti-hydrogen embrittlement sealing connection device achieves all-round coverage and active sealing of the pipeline connection by adopting a combination structure of double-lobe protective sleeve and built-in pressurizable main sealing ring. The annular sealing cavity in the main sealing ring can be pressurized through the sealing gas nozzle to ensure the tight seal of the sealing structure and form a continuous, dense and elastic sealing layer at the pipeline connection gap, effectively blocking the hydrogen permeation path.

[0013] 2. This hydrogen-blended natural gas pipeline anti-hydrogen embrittlement sealing connection device achieves dynamic adjustment and compensation of sealing pressure through the installation of an external adjustable telescopic support frame and a sliding pressure ring mechanism. During pipeline operation, changes in temperature and pressure, or material creep may cause the sealing force to weaken. In this case, the length of the telescopic support frame can be adjusted to reapply sufficient clamping force, ensuring that the main sealing ring and the end sealing ring are always in an effective working state. The stepped end sealing structure further enhances the sealing redundancy and works in conjunction with the main sealing ring to cope with the extreme permeability of hydrogen, ensuring the sealing safety of the pipeline connection under long-term complex operating conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This utility model Figure 2 Schematic diagram of the structure at point A; Figure 4 This utility model Figure 2 A schematic diagram of the structure at point B.

[0015] In the diagram: 1. Protective sleeve; 2. Telescopic support frame; 21. Outer sleeve; 22. Inner threaded rod; 3. Sliding pressure ring; 4. Pipe clamp; 5. Main sealing ring; 51. Annular sealing cavity; 52. Sealing nozzle; 53. Sealing plug cap. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1 to 4 This utility model provides a hydrogen embrittlement-resistant sealing connection device for hydrogen-blended natural gas pipelines. The device mainly consists of a protective sleeve 1, a telescopic support frame 2, a sliding pressure ring 3, a pipe clamp 4, and a main sealing ring 5. The protective sleeve 1 is made of a high-strength hydrogen embrittlement-resistant alloy and has a two-part structure. It is opened and closed by a hinge and a locking bolt. The main sealing ring 5 is located in the middle of its inner side. The inside of the main sealing ring 5 is an annular sealing cavity 51. Air or special sealant can be injected through a sealing nozzle 52 to deform the main sealing ring 5, making it fit more closely to the protective sleeve 1 and the pipeline, thus ensuring its sealing effect. After filling, the sealant plug cap 53 is used to seal it.

[0018] The protective sleeve 1 is fixed to pipe clamps 4 by bolts at both ends. Anti-slip pads are provided inside the clamps to enhance the friction between the sleeve and the pipe and protect the outer wall of the pipe. Baffles are provided at both ends of the outer wall of the protective sleeve 1. The sliding pressure ring 3 is sleeved on the protective sleeve 1 and located between the baffles and the pipe clamps 4. A telescopic support frame 2 is hinged to the outside of the sliding pressure ring 3. The telescopic support frame 2 consists of an outer sleeve 21 and an inner screw 22. The overall length can be adjusted by rotating the inner screw 22, which pushes the sliding pressure ring 3 toward the pipe clamps 4, thereby compressing the main sealing ring 5 to achieve a seal. At the same time, the telescopic support frame 2 can achieve fixed support for the pipe.

[0019] A stepped sealing structure is provided between the pipe clamp 4 and the end of the protective sleeve 1, in which an end sealing ring is installed to form a second line of sealing protection. The entire device achieves multiple seals and hydrogen embrittlement protection at the pipe connection through a combination of mechanical pressurization and pressure sealing.

[0020] In summary, this hydrogen-embrittlement-resistant sealing connection device for hydrogen-blended natural gas pipelines is used by first opening the protective sleeve 1, wrapping it around the pipeline connection, closing and locking it, and then adjusting the telescopic support frame 2 to apply initial sealing pressure. Next, pressure is injected into the annular sealing cavity 51 through the sealing nozzle 52, and then the sealing nozzle 52 is closed. During operation, the telescopic support frame 2 can be adjusted as needed to compensate for the sealing pressure. Simultaneously, another telescopic support frame 2 can provide support for the pipeline. This invention has a reasonable structure, reliable sealing, and convenient maintenance, and is suitable for various hydrogen-blended natural gas pipeline connection scenarios.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydrogen-embrittlement-resistant sealing connection device for hydrogen-blended natural gas pipelines, characterized in that: Includes a protective sleeve (1), which is wrapped in a double-lobed shape at the pipe connection. The inner side of the protective sleeve (1) at the pipe connection is provided with a main sealing ring (5) to seal the gap at the pipe connection. The main sealing ring (5) has an annular sealing cavity (51) inside. A sealing nozzle (52) is installed on the outside of the main sealing ring (5). The sealing nozzle (52) is connected to the inside of the annular sealing cavity (51). One end of the sealing nozzle (52) passes through the protective sleeve (1) and is connected to a sealing rubber plug cap (53).

2. The hydrogen embrittlement prevention sealing connection device for hydrogen-blended natural gas pipelines according to claim 1, characterized in that: The main sealing ring (5) is located in the middle of the protective sleeve (1).

3. The hydrogen embrittlement prevention sealing connection device for hydrogen-blended natural gas pipelines according to claim 2, characterized in that: The protective sleeves (1) are combined to form a complete tube, and a concave groove is provided at the connection of the two protective sleeves (1), and a sealing rubber gasket is provided in the groove.

4. The hydrogen embrittlement prevention sealing connection device for hydrogen-blended natural gas pipelines according to claim 3, characterized in that: The protective sleeve (1) has pipe clamps (4) installed at both ends by bolts. The two pipe clamps (4) are respectively circular and movably sleeved on the outside of the pipe.

5. The hydrogen embrittlement prevention sealing connection device for hydrogen-blended natural gas pipelines according to claim 4, characterized in that: The inner surface of the pipe clamp (4) that contacts the pipe is provided with an anti-slip pad.

6. The hydrogen embrittlement prevention sealing connection device for hydrogen-blended natural gas pipelines according to claim 5, characterized in that: The protective sleeve (1) has baffles installed at both ends on the outside. The protective sleeve (1) has sliding pressure rings (3) movably connected to both ends. The two sides of the sliding pressure rings (3) abut against the pipe clamps (4) and the baffles respectively. The sliding pressure ring (3) is hinged to a telescopic support frame (2) on its outer side.

7. The hydrogen embrittlement prevention sealing connection device for hydrogen-blended natural gas pipelines according to claim 6, characterized in that: The telescopic support frame (2) includes an outer tube (21) and an inner screw (22); One end of the outer sleeve (21) is hinged to the outside of the sliding pressure ring (3), and one end of the inner screw (22) is located inside the end of the outer sleeve (21) away from the sliding pressure ring (3) and is threadedly connected to it.

8. The hydrogen embrittlement prevention sealing connection device for hydrogen-blended natural gas pipelines according to claim 7, characterized in that: The inner side of the pipe clamp (4) forms a stepped sealing structure on the inner side of the end of the protective sleeve (1), and a main sealing ring (5) is provided between them. The main sealing ring (5) abuts against the outer side of the protective sleeve (1), the pipe clamp (4) and the pipe respectively.

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