A pressure relief device for a hydrogen pipeline

Abstract

A kind of belt pressure leak device for hydrogen pipeline, for the hydrogen leakage of pipeline is carried out on-line leak, the device includes: alloy inner layer, the alloy inner layer is attached to the outer surface of pipeline;Multiple sealing rings, any sealing ring is attached to the outer surface of alloy inner layer, for strengthening the fit of alloy inner layer and the outer surface of pipeline, enhance stability;An outer layer fixing frame is fixedly arranged on the sealing ring;Leakage hydrogen processing module is fixedly arranged on the outer layer fixing frame, for the hydrogen leakage of pipeline is carried out on-line leak.The utility model solves the long-standing poor safety, short sealing life problem in the field.

Description

Technical Field

[0001] This utility model relates to the field of high-risk gas pipeline maintenance technology, and in particular to a pressurized leak-proof device for hydrogen pipelines. Background Technology

[0002] This utility model is applicable to hydrogen energy infrastructure such as hydrogen refueling stations for hydrogen fuel cell vehicles, chemical hydrogen production pipelines, and aerospace fuel transportation systems, as well as the maintenance of pipelines transporting other easily leakable and flammable gases such as methane and ethylene.

[0003] Conventional pipeline leak sealing tools (such as mechanical clamps and adhesive sealants) pose significant risks, including the high risk of hydrogen explosions from traditional welding methods; conventional clamp seals are prone to hydrogen embrittlement failure under high-pressure hydrogen environments; and existing pressurized leak sealing devices are complex to operate, with an average operation time exceeding 2 hours. Currently, there is an urgent need for a novel pressurized leak-eliminating tooling for hydrogen purging pipelines that is compact, offers excellent sealing performance, is easy to operate, and is highly safe, enabling rapid and safe leak elimination without interrupting hydrogen supply or venting. Utility Model Content

[0004] The purpose of this invention is to provide a pressurized leak-proof device for hydrogen pipelines, which has the advantages of rapid leak elimination and improved safety.

[0005] To achieve the above objectives, this utility model provides a pressurized leak-proof device for hydrogen pipelines, used for online leak-proofing of hydrogen leaks in pipelines. The device includes: an alloy inner layer, which is bonded to the outer surface of the pipeline; multiple sealing rings, each of which is bonded to the outer surface of the alloy inner layer to strengthen the adhesion between the alloy inner layer and the outer surface of the pipeline and enhance stability; an outer fixing frame, fixedly mounted on the sealing rings; and a leak hydrogen treatment module, fixedly mounted on the outer fixing frame, used for online leak-proofing of hydrogen leaks in the pipeline.

[0006] Preferably, the hydrogen leakage treatment module comprises: a hydrogen leakage extinguishing box, which is fixedly mounted on an outer fixing frame; during online leakage extinguishing, the hydrogen leakage extinguishing box conforms to and covers the location of the leaking hydrogen in the pipeline; two or more liquid nitrogen input pipelines connected to the hydrogen leakage extinguishing box; and each liquid nitrogen input pipeline has a liquid nitrogen inlet; during online leakage extinguishing, liquid nitrogen is injected into the hydrogen leakage extinguishing box through the liquid nitrogen inlet.

[0007] Preferably, the liquid nitrogen input pipeline is further equipped with several pressure relief valves, and the flow rate of liquid nitrogen is controlled by controlling the hydraulic valves.

[0008] Preferably, the hydrogen leakage treatment module includes two liquid nitrogen input pipes, on which a first pressure relief valve and a second pressure relief valve are respectively installed.

[0009] Preferably, the device further includes a hydraulic fixing module, which is fixedly disposed on the outer surface of the hydrogen leak-proof box, and can push the hydrogen leak-proof box to enhance the effect of fitting and covering the pipeline.

[0010] Preferably, the inner alloy layer is made of tungsten carbide cemented carbide with a cone angle of 5-10° and a surface laser-clad nickel-based hydrogen-resistant coating.

[0011] Preferably, the sealing ring is made of PTFE / graphite / nano-ceramic multilayer pressing, which is resistant to hydrogen permeation and adaptable to pipeline vibration.

[0012] Preferably, the system further includes: a plurality of hydrogen sensors, which are integrated into a hydrogen leak-proof box to monitor the hydrogen concentration in the hydrogen leak-proof box in real time.

[0013] In summary, compared with the prior art, the pressurized leak-proof device for hydrogen pipelines provided by this utility model has the following beneficial effects:

[0014] First, this utility model is specifically designed to address the high permeability of hydrogen, hydrogen embrittlement effect, and risk of combustion and explosion. Through a combination of material composites, inert cooling, and real-time monitoring, it solves the long-standing problems of poor safety and short sealing life in this field.

[0015] Secondly, this invention achieves spark-free rapid sealing in a hydrogen environment; overcomes the expansion and failure of sealing materials caused by hydrogen permeation; and improves safety through an online leakage monitoring and inerting system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a pressurized leak-proof device for hydrogen pipelines proposed in this utility model.

[0017] Figure label:

[0018] 1-Alloy inner layer, 2-Hydrogen leak-proof box, 3-Outer layer fixing frame, 4-Sealing ring, 5-Liquid nitrogen inlet, 6-First pressure relief valve, 7-Liquid nitrogen inlet pipe, 8-Second pressure relief valve, 20-Hydraulic fixing module. Detailed Implementation

[0019] The following will be combined with the appendix in the embodiments of this utility model. Figure 1 The technical solutions, structural features, objectives and effects achieved in the embodiments of this utility model are described in detail.

[0020] It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to facilitate and clarify the illustration of the embodiments of this utility model, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationship, or adjustments to the size should still fall within the scope of the technical content disclosed in this utility model, provided that they do not affect the effects and objectives that this utility model can produce.

[0021] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 the expressly listed elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0022] This invention proposes a pressurized leak-proof device for hydrogen pipelines. This invention is used to eliminate hydrogen leaks in pipelines online, achieve spark-free rapid sealing in a hydrogen environment, overcome the expansion and failure of sealing materials caused by hydrogen permeation, and improve safety through an online leak monitoring and inerting system.

[0023] like Figure 1 As shown, the device includes:

[0024] Alloy inner layer 1 is attached to the outer surface of the pipe; in a specific embodiment, the alloy inner layer can be a columnar structure with a circular cross-section, or it can be a structure with a square cross-section, etc., depending on actual needs, and there is no limitation here;

[0025] Multiple sealing rings 4 are provided, each of which is fitted onto the outer surface of the alloy inner layer 1 to strengthen the fit between the alloy inner layer 1 and the outer surface of the pipe and enhance stability.

[0026] An outer fixing bracket 3 is fixedly mounted on the sealing ring 4;

[0027] The hydrogen leakage treatment module is fixedly installed on the outer mounting frame 3 and is used to eliminate hydrogen leakage in the pipeline online.

[0028] In a specific embodiment, the leaked hydrogen treatment module includes:

[0029] Hydrogen leak detection box 2 is fixedly installed on the outer fixing frame 3; when leak detection is performed online, the hydrogen leak detection box 2 fits and covers the location of the leaking hydrogen in the pipeline;

[0030] Two or more liquid nitrogen input pipes 7 are connected to the hydrogen leak-proof box 2; and each liquid nitrogen input pipe 7 has a liquid nitrogen inlet 5; when leaking online, liquid nitrogen (cooled to -196°C to suppress hydrogen combustion) is injected into the hydrogen leak-proof box 2 through the liquid nitrogen inlet 5.

[0031] In a preferred embodiment, in order to control the flow rate of liquid nitrogen, a number of pressure relief valves are also provided on the liquid nitrogen input pipeline, and the flow rate of liquid nitrogen is controlled by controlling the hydraulic valves.

[0032] like Figure 1 As shown, in this embodiment, two liquid nitrogen input pipes 7 are used, so a first pressure relief valve 6 and a second pressure relief valve 8 are correspondingly provided.

[0033] In addition, to prevent leakage from gaps in the hydrogen leak-proof box 2 due to gas, the device further includes a hydraulic fixing module 20, which is fixedly disposed on the outer surface of the hydrogen leak-proof box 2. This module can push the hydrogen leak-proof box 2 to enhance its fit and coverage of the pipeline. In a specific embodiment, a hydraulic method can be used, where mechanical compression and deformation are used to fit the leaking hydrogen location.

[0034] For example, a lightweight hydraulic cylinder, arc-shaped grippers, and sleeve are used; and an external liquid nitrogen circulation channel is connected; the lightweight hydraulic cylinder drives the arc-shaped grippers to achieve 360° circulation around the pipeline, avoiding welding or open flame operations; the sleeve has a built-in liquid nitrogen circulation channel (-196℃ cooling to suppress hydrogen combustion), and liquid nitrogen or CO2 is introduced to reduce the local temperature and reduce the risk of hydrogen explosion; at the same time, a pressure sensor is set to provide real-time feedback of the clamping force (range 0~15MPa).

[0035] Furthermore, the inner alloy layer 1 needs to be made of a hydrogen-resistant metal (such as Inconel 625) or tungsten carbide cemented carbide, with a cone angle of 5-10°, and a nickel-based hydrogen-resistant coating laser-clad on the surface. The sealing ring 4 is made of PTFE / graphite / nano-ceramic multilayer pressing, which is resistant to hydrogen permeation and adapts to pipeline vibration.

[0036] In a preferred embodiment, the system further includes: the monitoring and inerting system, for example, using a hydrogen sensor, which is integrated into the hydrogen leak-proof box 2 to monitor the hydrogen concentration in the hydrogen leak-proof box 2 in real time.

[0037] In summary, this invention achieves spark-free rapid sealing in a hydrogen environment: it employs a hydraulic fixing module 20 and a sealing ring 4 surrounding the pipeline, avoiding welding or open flame operations, and the clamping time is ≤3 minutes, making operation convenient and efficient. This invention overcomes the expansion and failure of sealing materials caused by hydrogen permeation: the inner layer of the composite conical sealing head has a hard alloy cone surface laser-clad with a nickel-based hydrogen-resistant coating, and the outer gradient expansion sealing ring is made of PTFE / graphite / nano-ceramic multilayer pressing, effectively resisting hydrogen permeation. This invention integrates a hydrogen sensor to monitor the concentration in the sealing cavity in real time, designs a nitrogen injection port for inerting treatment, and has a built-in liquid nitrogen circulation channel in the sleeve to reduce local temperature, providing multiple safeguards to enhance safety. This invention has a wide range of applications: pressure range applicable to pipeline pressures of 0.1~10MPa (adjustable according to actual operating conditions), temperature adaptability of -50℃~200℃ (high temperature requires a cooling system), long sealing life, static sealing ≥5 years, dynamic vibration conditions ≥1 year.

[0038] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A pressurized leak-proof device for hydrogen pipelines, characterized in that, The device is used for online leak detection of hydrogen leaks in pipelines, and includes: Alloy inner layer (1), the alloy inner layer (1) is attached to the outer surface of the pipe; Multiple sealing rings (4), each of which is fitted to the outer surface of the alloy inner layer (1) to strengthen the fit between the alloy inner layer (1) and the outer surface of the pipe and enhance stability; An outer fixing bracket (3) is fixedly mounted on the sealing ring (4); The hydrogen leakage treatment module is fixedly installed on the outer frame (3) and is used to eliminate hydrogen leakage in the pipeline online.

2. The pressurized leak-proof device for hydrogen pipelines according to claim 1, characterized in that, The leaked hydrogen treatment module includes: Hydrogen leak detection box (2), which is fixedly installed on the outer fixing frame (3); when leak detection is performed online, the hydrogen leak detection box (2) fits and covers the location of the leaking hydrogen in the pipeline; Two or more liquid nitrogen input pipes (7) are connected to a hydrogen leak-proof box (2); and each liquid nitrogen input pipe (7) has a liquid nitrogen input port (5); when leaks are eliminated online, liquid nitrogen is injected into the hydrogen leak-proof box (2) through the liquid nitrogen input port (5).

3. A pressurized leak-proof device for hydrogen pipelines according to claim 2, characterized in that, The liquid nitrogen input pipeline (7) is also equipped with several pressure relief valves, and the flow rate of liquid nitrogen is controlled by controlling the hydraulic valves.

4. A pressurized leak-proof device for hydrogen pipelines according to claim 3, characterized in that, The hydrogen leakage treatment module includes two liquid nitrogen input pipes (7), on which a first pressure relief valve (6) and a second pressure relief valve (8) are respectively installed.

5. A pressurized leak-proof device for hydrogen pipelines according to claim 4, characterized in that, The device also includes a hydraulic fixing module (20), which is fixedly installed on the outer surface of the hydrogen leak-proof box (2) and can push the hydrogen leak-proof box (2) to enhance the effect of fitting and covering the pipeline.

6. A pressurized leak-proof device for hydrogen pipelines according to claim 5, characterized in that, The inner layer (1) of the alloy is made of tungsten carbide hard alloy with a cone angle of 5-10° and a nickel-based anti-hydrogen coating laser-clad on the surface.

7. A pressurized leak-proof device for hydrogen pipelines according to claim 6, characterized in that, The sealing ring (4) is made of PTFE / graphite / nano-ceramic multilayer pressing, which is resistant to hydrogen permeation and adapts to pipeline vibration.

8. A pressurized leak-proof device for hydrogen pipelines according to claim 7, characterized in that, The system also includes: several hydrogen sensors, which are integrated into the hydrogen leak-proof box (2) to monitor the hydrogen concentration in the hydrogen leak-proof box (2) in real time.

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