Hydrogen pipeline pre-membrane pig and system

Abstract

The application provides a hydrogen pipeline pre-membrane pig and system, which comprises a spraying joint, a liquid storage joint and a universal joint. The two ends of the universal joint are connected with the liquid storage joint and the spraying joint correspondingly. The spraying joint comprises a mixing bin and two tail wing driving discs. The two tail wing driving discs are oppositely arranged at the two ends of the mixing bin. The mixing bin is provided with a plurality of spraying ports. The plurality of spraying ports are arranged in a ring shape in layers, and the spraying ports between adjacent two layers are distributed in a staggered manner. The hydrogen pipeline pre-membrane pig and system can improve the efficiency and quality of the corrosion inhibitor coating, reduce the probability of hydrogen embrittlement, and prolong the service life of the pipeline.

Description

Technical Field

[0001] This invention relates to the field of pipeline protection technology, specifically to a pre-filming pig for hydrogen transportation pipelines and a pre-filming pigging system for hydrogen transportation pipelines. Background Technology

[0002] With the development of the hydrogen energy industry, pipeline transportation is the main method for large-scale hydrogen transport. During transportation, hydrogen molecules are small and highly permeable, easily causing hydrogen embrittlement in metallic materials. Hydrogen embrittlement refers to the phenomenon where hydrogen molecules penetrate into the interior of metallic materials, leading to a decrease in the material's mechanical properties and brittle fracture. In related technologies, coating the inner wall of pipelines with corrosion inhibitors can prevent hydrogen molecules from penetrating the metal pipeline. However, achieving ideal coverage is often difficult during the coating process, and some areas still remain potential points of risk for hydrogen penetration. Summary of the Invention

[0003] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0004] Hydrogen embrittlement refers to the phenomenon where hydrogen molecules, under certain conditions, can penetrate into the internal crystal lattice structure of metallic materials, leading to significant changes in the material's microstructure and properties. These changes typically manifest as a substantial decrease in the mechanical properties of the metallic material, such as reduced toughness and ductility. In severe cases, it can even cause brittle fracture of the material without significant external force or at a load-bearing capacity far below its normal operating level.

[0005] In related technologies, coating the inner wall of a pipe with corrosion inhibitors can form a dense protective film on the metal surface, effectively preventing hydrogen molecules from penetrating into the metal pipe. However, although coating with corrosion inhibitors can theoretically significantly reduce the risk of hydrogen permeation, it often faces many challenges in actual operation. For example, due to the complexity of the pipe's inner wall surface and the limitations of the corrosion inhibitor coating process, it is often difficult to achieve the ideal coverage effect, making some areas potential risk points for hydrogen permeation, leading to a weakening or failure of the corrosion inhibitor's protective effect.

[0006] Therefore, the present invention provides a pre-filming pigging device for hydrogen transportation pipelines, which can improve the efficiency and quality of corrosion inhibitor coating, reduce the probability of hydrogen embrittlement, and extend the service life of pipelines.

[0007] The hydrogen pipeline pre-filming pigging device includes a jetting section, a storage section, and a universal joint. The two ends of the universal joint are connected to the storage section and the jetting section respectively. The jetting section includes a mixing chamber and two tail fin drive discs. The two tail fin drive discs are arranged opposite each other at both ends of the mixing chamber. The mixing chamber has multiple injection ports, which are arranged in a ring-shaped layer, and the injection ports between adjacent layers are staggered.

[0008] In summary, the hydrogen pipeline pre-filming pig provided by this invention can significantly improve the uniformity and integrity of the corrosion inhibitor coating on the inner wall of the pipeline through the layered and staggered arrangement of the injection nozzles, thereby effectively extending the service life of the pipeline and reducing pipeline leakage and maintenance costs caused by corrosion.

[0009] In some embodiments, the mixing chamber includes a cylinder and a gas-liquid mixer. The cylinder has a spiral air passage on its side wall. The spiral air passage, the gas-liquid mixer, and the injection port are connected in sequence so that the corrosion inhibitor in the liquid storage section can be sprayed out through the injection port.

[0010] In some embodiments, the gas-liquid mixer has a plurality of honeycomb-shaped holes;

[0011] And / or, the injection port on the mixing chamber is provided with two layers, and the injection port is provided with an atomizing nozzle.

[0012] In some embodiments, the tail wing drive disc includes a plurality of fan-shaped plates, which are arranged in multiple layers, with the fan-shaped plates of adjacent layers being staggered and fitted together.

[0013] In some embodiments, the liquid storage section includes a liquid storage tank and a plurality of support components. The plurality of support components are arranged at equal intervals around the liquid storage tank. Each support component includes a support rod, a wheel, and an elastic element. One end of the support rod is rotatably connected to the liquid storage tank, the wheel is located at the other end of the support rod, and both ends of the elastic element are correspondingly connected to the support rod and the liquid storage tank.

[0014] In some embodiments, the support assembly includes a first wheel group and a second wheel group, wherein the first wheel group is located at one end of the liquid storage tank and the second wheel group is located at the other end of the liquid storage tank.

[0015] In some embodiments, the liquid storage tank includes a first shaft segment and a second shaft segment, the inner diameter of the first shaft segment is larger than the inner diameter of the second shaft segment, the second shaft segment is disposed relative to the first shaft segment and close to the injection section, and a piston is provided in the liquid storage tank, the piston having a first diameter segment and a second diameter segment, the first diameter segment being adapted to the first shaft segment, and the second diameter segment being adapted to the second shaft segment.

[0016] In some embodiments, the hydrogen pipeline pre-filming pig further includes a signal transmitter, which is located on the liquid storage section and is used to send the location information of the hydrogen pipeline pre-filming pig to an external terminal.

[0017] In some embodiments, the hydrogen pipeline pre-filming pig further includes a liquid level monitor, which is disposed on the liquid storage section and is used to detect the remaining amount of corrosion inhibitor in the liquid storage section.

[0018] In addition, one embodiment of the present invention provides a hydrogen pipeline pre-filming pigging system, which includes a foam pigging device and the hydrogen pipeline pre-filming pigging device provided in any of the above embodiments. Two foam pigging devices are provided, and the two foam pigging devices are respectively located at both ends of the hydrogen pipeline pre-filming pigging device in the extension direction of the pipeline to be cleaned. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a hydrogen pipeline pre-filming pig provided in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a hydrogen pipeline pre-filming pig provided in an embodiment of the present invention.

[0021] Figure 3 This is a side view schematic diagram of a hydrogen pipeline pre-filming pig provided in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the internal structure of a hydrogen pipeline pre-filming pig provided in an embodiment of the present invention.

[0023] Figure 5 yes Figure 2 The diagram shows a cross-sectional view of the hydrogen pipeline pre-filming pig along line AA.

[0024] Figure 6 yes Figure 5 The diagram shows a partial enlarged view of the hydrogen pipeline pre-filming pig at point B.

[0025] Attached label: 100, hydrogen pipeline pre-filming pig;

[0026] 10. Injection section; 11. Mixing chamber; 111. Injection nozzle; 112. Jet pipe; 113. Cylinder; 114. Gas-liquid mixer; 115. Spiral air passage; 116. Atomizing nozzle; 12. Tail fin drive disc; 121. Fan-shaped plate; 122. Gap;

[0027] 20. Liquid reservoir section; 21. Liquid reservoir; 211. First shaft section; 212. Second shaft section; 22. Support assembly; 221. Support rod; 222. Traveling wheel; 223. Elastic element; 224. Fixed rod; 2241. Bushing; 225. Sliding rod; 2251. Contact plate; 23. Piston; 231. First diameter section; 232. Second diameter section;

[0028] 30. Universal joint; 31. Joint rod; 311. First pivot; 312. Second pivot; 32. First connecting seat; 33. Second connecting seat;

[0029] 40. Signal transmitter;

[0030] 50. Liquid level monitor. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] like Figures 1 to 6 As shown, an embodiment of the present invention provides a pre-filming pigging device 100 for a hydrogen transport pipeline, which includes an injection section 10, a storage section 20, and a universal joint 30. The two ends of the universal joint 30 are connected to the storage section 20 and the injection section 10 respectively. The injection section 10 includes a mixing chamber 11 and two tail fin drive disks 12. The two tail fin drive disks 12 are disposed opposite to each other at both ends of the mixing chamber 11. The mixing chamber 11 has a plurality of injection ports 111. The plurality of injection ports 111 are arranged in a ring-shaped layer, and the injection ports 111 between adjacent layers are staggered.

[0033] Specifically, the mixing chamber 11 has a spherical end, and the injection port 111 can be divided into at least a first layer and a second layer. The injection ports 111 in the first layer and the second layer are equally spaced around the axis of the spherical end. The injection ports 111 in the first layer are positioned closer to the axis of the spherical end than the injection ports 111 in the second layer. At least one injection port 111 in the first layer is located between two adjacent injection ports 111 in the second layer, so that the injection ports 111 in the adjacent two layers are staggered. This allows the pre-filming liquid to form a denser coverage network when it is sprayed, which greatly improves the efficiency and effect of the pre-filming operation and ensures that the corrosion inhibitor sprayed by the injection port 111 can evenly cover every area of ​​the inner wall of the pipe.

[0034] Two tail fin drive discs 12 are respectively located at both ends of the mixing chamber 11. The outer diameter of the tail fin drive disc 12 is adapted to the inner diameter of the pipeline to be cleaned, allowing the tail fin drive disc 12 to fit tightly inside the pipeline, providing a strong guarantee for the stable movement of the pipeline pig. When the hydrogen pipeline pre-filming pig moves inside the pipeline, the pressure on both sides of the tail fin drive disc 12 can be adjusted. Utilizing the pressure difference, the tail fin drive disc 12 drives the injection section 10 and the liquid storage section 20 to move smoothly inside the pipeline. This not only improves the moving efficiency of the pipeline pig but also ensures the stability and reliability of the pipeline cleaning operation.

[0035] Furthermore, the universal joint 30 is connected to the reservoir section 20 and the jet section 10 at both ends, ensuring that the entire pig can flexibly cope with complex and ever-changing pipeline environments, especially when facing curved sections of the pipeline, it can still maintain smooth movement and operation capabilities. In addition, the corrosion inhibitor loaded in the reservoir section 20 can be continuously and stably supplied to the mixing chamber 11 during the movement of the pig, providing sufficient raw material support for the pre-filming operation.

[0036] It should be noted that in this embodiment, the injection port 111 on the mixing chamber 11 has two layers, and the injection section 10 also includes a jet pipe 112. The injection port 111 is disposed on the jet pipe 112, and the jet pipe 112 is bent so that the injection port is directed toward the inner wall of the pipe. Of course, in some other embodiments, the injection port 111 may also be provided with a number of layers as needed, such as 3 layers, 4 layers, etc., which will not be elaborated here.

[0037] In summary, the hydrogen pipeline pre-filming pig 100 provided in this embodiment of the invention can significantly improve the uniformity and integrity of the corrosion inhibitor coating on the inner wall of the pipeline, thereby effectively extending the service life of the pipeline and reducing pipeline leakage and maintenance costs caused by corrosion.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, the tail wing drive disc 12 includes multiple sector plates 121, which are arranged in multiple layers, with the sector plates 121 of adjacent layers being staggered and fitted together. That is to say, the sector plates 121 of adjacent layers are not perfectly aligned one-to-one, but are staggered and fitted together, which can enhance the structural stability and overall performance of the tail wing drive disc 12.

[0039] Specifically, the sector plate 121 can be divided into at least a first layer plate and a second layer plate. There is a gap 122 between two adjacent sector plates 121 in the first layer plate. At least one sector plate 121 in the second layer plate is located at the gap 122 to seal the gap 122, thereby forming a staggered fit between the sector plates 121 of the two adjacent layers.

[0040] When a pressure difference exists on both sides of the tail fin drive disc 12, the reserved gaps 122 play a crucial role. On the side with higher pressure, fluid flows through these gaps 122, exerting thrust on the sector plates 121 located at the gaps 122. Since the sector plates 121 are tightly connected to the tail fin drive disc 12, this thrust is converted into the propulsion for the tail fin drive disc 12, propelling it to move smoothly within the pipeline. This design, driven by pressure difference, not only simplifies the pig's power system but also significantly improves its efficiency and stability.

[0041] Furthermore, when turbulence exists in the fluid on one side of the tail fin drive disc 12, the fluid not only exerts thrust on the tail fin drive disc 12, propelling it to move, but also generates a rotational torque under specific conditions, causing the tail fin drive disc 12 to rotate while moving. This rotation can further optimize the spraying effect of the spray section 10, making its spraying more uniform, thereby improving the working efficiency and quality of the pig in the pipeline.

[0042] like Figure 2As shown, in this embodiment, the universal joint 30 includes a joint rod 31, a first connecting seat 32, and a second connecting seat 33. The joint rod 31 is provided with a first rotating shaft 311 and a second rotating shaft 312. The axis of the first rotating shaft 311 and the axis of the second rotating shaft 312 are perpendicular to each other. The first connecting seat 32 is used to connect the first rotating shaft 311 and the liquid storage joint 20, and the second connecting seat 33 is used to connect the second rotating shaft 312 and the spray joint 10.

[0043] Optionally, the first rotating shaft 311 and the second rotating shaft 312 can be configured as components such as bolts or pins.

[0044] like Figure 4 and Figure 5 As shown, in some embodiments, the mixing chamber 11 includes a cylinder 113 and a gas-liquid mixer 114. The side wall of the cylinder 113 is provided with a spiral air passage 115. The spiral air passage 115, the gas-liquid mixer 114 and the injection port 111 are connected in sequence so that the corrosion inhibitor in the liquid storage section 20 can be sprayed out through the injection port 111.

[0045] Specifically, the spiral air passage 115 extends spirally along the side wall of the cylinder 113, forming a continuous and smooth fluid channel, which allows the compressed air or other driving gas flowing through it to undergo continuous changes in flow direction, thereby enhancing the turbulence of the gas.

[0046] Furthermore, the fluid channel works in conjunction with the annularly arranged nozzles 111 to form a spiral spray of the corrosion inhibitor mixture at the nozzles 11. This helps to increase the power of the corrosion inhibitor mixture during spraying, ensuring that the corrosion inhibitor mixture can be sprayed out at a higher speed and with a wider coverage area. It also improves the spraying effect of the corrosion inhibitor, ensuring that the corrosion inhibitor can effectively adhere to the inner wall of the hydrogen pipeline.

[0047] In other words, when compressed air or other driving gas passes through the spiral air passage 115, its flow direction changes continuously with the change of the spiral air passage 115. This dynamic flow helps to enhance the mixing effect and jet power of the fluid. The gas-liquid mixer 114 is used to efficiently mix the driving gas from the spiral air passage 115 with the corrosion inhibitor in the liquid storage section 20, forming a uniform gas-liquid mixture. Subsequently, this mixture forms fine droplets or mist at the injection port 111, thereby increasing the contact area between the corrosion inhibitor and the inner wall of the pipe, thus improving the adhesion effect and corrosion protection capability. In this embodiment, the cylinder 113 is provided with two layers, that is, an inner layer and an outer layer. The inner layer is used to receive and store the corrosion inhibitor from the liquid storage section 20, and the outer layer is provided with the spiral air passage 115.

[0048] Furthermore, the gas-liquid mixer 114 has multiple honeycomb-shaped pores. Each honeycomb pore is equivalent to a miniature mixing unit, which not only increases the gas-liquid contact area but also promotes intense turbulence and shearing between the fluids. When the driving gas and corrosion inhibitor flow through these honeycomb pores, they are forced to meander within the tiny channels. This complex flow path greatly enhances the mixing efficiency and uniformity between the fluids.

[0049] Furthermore, the injection port 111 is equipped with an atomizing nozzle 116. The atomizing nozzle 116 can refine the pre-filming liquid into tiny droplets. These tiny droplets have a larger surface area, allowing them to contact the inner wall of the pipe more effectively, thereby improving the coverage and efficiency of the pre-filming operation. Simultaneously, due to the small size of the droplets, they can penetrate deeper into the tiny gaps and uneven areas of the inner wall of the pipe, ensuring the integrity and continuity of the pre-filming layer. In this embodiment, the atomizing nozzle 116 is located at the end of the jet pipe 112.

[0050] Furthermore, the introduction of the atomizing nozzle 116 allows the pre-filming liquid to form a uniform and dense protective film during spraying. This protective film effectively isolates the corrosive medium from direct contact with the inner wall of the pipe, thereby significantly extending the service life of the pipe. In addition, since the atomizing nozzle 116 can precisely control the spray volume and spray angle of the pre-filming liquid, personalized pre-filming treatment can be performed according to the different materials, shapes, and corrosion levels of the inner wall of the pipe, improving the targeting and effectiveness of the operation.

[0051] It is worth mentioning that the use of atomizing nozzle 116 also brings additional energy-saving effects. Due to the refinement of droplets, the energy consumption of the pre-film liquid during the spraying process is effectively reduced. At the same time, due to the improved uniformity and density of the pre-film layer, the amount of pre-film liquid required is also reduced accordingly, thereby achieving rational utilization of resources and cost savings.

[0052] like Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, the liquid storage section 20 includes a liquid storage tank 21 and a plurality of support components 22. The plurality of support components 22 are arranged at equal intervals around the liquid storage tank 21. The support components 22 include a support rod 221, a traveling wheel 222 and an elastic element 223. One end of the support rod 221 is rotatably connected to the liquid storage tank 21, the traveling wheel 222 is located at the other end of the support rod 221, and the two ends of the elastic element 223 are correspondingly connected to the support rod 221 and the liquid storage tank 21.

[0053] Specifically, the support components 22 are evenly spaced around the liquid storage tank 21, forming a comprehensive, multi-angle support structure. This design not only enhances the stability of the pig when it travels inside the pipeline, but also allows the pig to better adapt to pipelines of different diameters and shapes, ensuring the stability and smoothness of the pig when it travels inside the pipeline.

[0054] Each support assembly 22 includes a support rod 221, a traveling wheel 222, and an elastic element 223. The support rod 221 acts as a bridge connecting the liquid storage tank 21 and the traveling wheel 222. One end of the support rod is connected to the liquid storage tank 21 via a rotatable connection, allowing the traveling wheel 222 to rotate freely within a certain range to adapt to different pipeline directions and curvatures. The traveling wheel 222 directly contacts the inner wall of the pipeline. Its material and design have undergone rigorous selection and optimization to ensure that it can provide sufficient friction to drive the pig forward during travel, while effectively reducing frictional wear against the inner wall of the pipeline and extending its service life.

[0055] The two ends of the elastic element 223 are connected to the support rod 221 and the liquid storage tank 21, respectively, forming an elastic suspension system. This design not only gives the support component 22 a certain buffering capacity, allowing it to automatically adjust its posture when encountering unevenness or obstacles in the pipeline, thus maintaining the smooth movement of the pig; at the same time, it can also absorb vibration and impact during the movement to a certain extent, further improving the stability and reliability of the pig.

[0056] like Figure 5 and Figure 6 As shown, in this embodiment, the support assembly 22 further includes a fixed rod 224 and a sliding rod 225. One end of the fixed rod 224 is connected to the liquid storage tank 21, and the other end of the fixed rod 224 is provided with a bushing 2241. The sliding rod 225 is slidably disposed within the bushing 2241. The sliding rod 225 has a first end and a second end. The first end is rotatably connected to the support rod 221, and the second end is provided with an abutment plate 2251. One end of the elastic element 223 abuts against the abutment plate 2251, and the other end of the elastic element 223 abuts against the bushing 2241. The support rod 221 is rotatably connected to the fixed rod 224. The fixed rod 224 can be detachably fixed to the liquid storage tank 21 by means of bolts.

[0057] Furthermore, the elastic element 223 is a spring, which is sleeved on the sliding rod 225.

[0058] like Figure 5 and Figure 6As shown, during the movement of the support assembly 22, when the inner diameter of the pipe decreases, the traveling wheel 222 drives the support rod 221 to move radially toward the axis relative to the liquid storage tank 21. The support rod 221 pulls the sliding rod 225 to slide within the bushing 2241. The sliding rod 225 compresses the elastic element 223 through the contact plate 2251, causing the elastic element 223 to deform. Conversely, when the inner diameter of the pipe increases, the elastic deformation force of the elastic element 223 drives the sliding rod 225 to move within the bushing 2241. The sliding rod 225 drives the support rod 221 and the traveling wheel 222 to move radially away from the axis in the liquid storage tank 21, keeping the traveling wheel 222 in contact with the inner wall of the pipe.

[0059] In other words, regardless of changes in the pipe's inner diameter, the traveling wheel 222 can always remain in contact with the pipe's inner wall, maintaining a stable support effect. This improves the applicability and reliability of the support assembly 22, enabling it to perform excellently in various complex pipe environments. It should be noted that the rotating connections between the components in the support assembly can be achieved using bolts or pins.

[0060] like Figure 1 , Figure 2 and Figure 5 As shown in this embodiment, the support assembly 22 includes a first wheel group and a second wheel group. The first wheel group is located at one end of the liquid storage tank 21, and the second wheel group is located at the other end of the liquid storage tank 21. That is, the multiple support assemblies 22 can be divided into a first wheel group and a second wheel group, which are positioned opposite each other at the two ends of the liquid storage tank 21. This allows the first and second wheel groups to work together to maintain the balance of the liquid storage tank 21 within the pipeline, providing more balanced support for the liquid storage section 20 as it moves through the pipeline. It also helps improve the overall maneuverability and flexibility of the pipeline cleaning device. The first wheel group and the second wheel group may have relative positions, meaning the first wheel group is closer to the jet section than the second wheel group.

[0061] like Figure 4 and Figure 5As shown, in some embodiments, the liquid storage tank 21 includes a first shaft segment 211 and a second shaft segment 212. The inner diameter of the first shaft segment 211 is larger than the inner diameter of the second shaft segment 212, and the second shaft segment 212 is positioned closer to the jet section 10 relative to the first shaft segment 211. The first shaft segment 211 serves as the inlet portion of the liquid storage tank 21, and its inner diameter is designed to be larger than that of the second shaft segment 212. This design not only facilitates the smooth flow of liquid but also reduces turbulence and resistance generated when the liquid flows into the liquid storage tank 21 to a certain extent, thereby improving the efficiency of the entire system. The second shaft segment 212 is positioned even closer to the jet section 10. The second shaft segment 212 is used to connect to the jet section 10 to ensure that the liquid can flow smoothly from the liquid storage tank 21 into the jet section 10 and achieve optimal effect during jetting. Simultaneously, the smaller inner diameter also helps to increase the liquid pressure, thereby improving the jetting efficiency and range.

[0062] like Figure 4 and Figure 5 As shown, a piston 23 is installed inside the liquid storage tank 21. The piston 23 has a first diameter section 231 and a second diameter section 232. The first diameter section 231 is adapted to the first shaft section 211, and the second diameter section 232 is adapted to the second shaft section 212. The matching of the inner diameter of the first diameter section 231 with the first shaft section 211 ensures a tight fit and stable movement of the piston 23 within the first shaft section 211. When the piston 23 moves within the first shaft section 211, it effectively controls the inflow rate of the liquid, preventing the liquid from rushing into the liquid storage tank 21 too quickly, thus avoiding unnecessary waste or pressure fluctuations.

[0063] The second diameter section 232 is matched with the inner diameter of the second shaft section 212, ensuring a tight fit and stable movement of the piston 23 within the second shaft section 212. When the piston 23 moves to the second shaft section 212, it further compresses the liquid in the reservoir 21, increasing the liquid pressure and providing sufficient power for the subsequent injection process. Simultaneously, the movement of the piston 23 within the second shaft section 212 also regulates the liquid outflow velocity, ensuring that the liquid flows smoothly and continuously into the injection section 10, maintaining stable pressure and flow rate during the injection process.

[0064] like Figure 2As shown, in some embodiments, the hydrogen pipeline pre-filming pig also includes a signal transmitter 40, which is located on the liquid storage section 20. The signal transmitter 40 is used to send the location information of the hydrogen pipeline pre-filming pig within the pipeline to be cleaned to an external terminal. Specifically, when the hydrogen pipeline pre-filming pig moves inside the pipeline, the signal transmitter 40 continuously collects data about the pig's location and transmits this data to an external terminal via wireless signal. The external terminal can be a control center, monitoring station, etc. By receiving and processing this location information, they can monitor the working status and location of the hydrogen pipeline pre-filming pig in real time, thereby achieving precise control over the entire cleaning process.

[0065] like Figure 2 As shown, in some embodiments, the hydrogen pipeline pre-filming pig also includes a level monitor 50, which is installed on the storage section 20. The level monitor 50 is used to detect the remaining amount of corrosion inhibitor in the storage section 20. Specifically, when the remaining amount of corrosion inhibitor in the storage section 20 changes, the level monitor 50 can quickly sense and collect relevant data, and then transmit the data to an external terminal or control center through its built-in communication module. After analysis and processing, this data can generate an intuitive level report or early warning information, reminding operators to replenish the corrosion inhibitor in a timely manner or take other necessary maintenance measures.

[0066] In addition, one embodiment of the present invention provides a pre-filming pigging system for hydrogen transportation pipelines, which includes a foam pigging device and a pre-filming pigging device 100 for hydrogen transportation pipelines provided in any of the above embodiments. Two foam pigging devices are provided, and the two foam pigging devices are located at both ends of the pre-filming pigging device 100 for hydrogen transportation pipelines in the extension direction of the pipeline to be cleaned.

[0067] In other words, during the operation of the hydrogen pipeline pre-filming pig 100, it is always located between the two foam pigs. The foam pigs can, to a certain extent, block and slow down the diffusion and penetration of hydrogen molecules inside the pipeline into the hydrogen pipeline pre-filming pig 100, reduce the risk of hydrogen embrittlement, help extend the service life of the hydrogen pipeline pre-filming pig 100, improve its working stability and reliability, and also, to a certain extent, ensure the safety and efficiency of the entire hydrogen pipeline pre-filming pig system.

[0068] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" of the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] In this invention, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pre-filming pigging device for hydrogen transportation pipelines, characterized in that, It includes a jet joint, a liquid storage joint, and a universal joint. The two ends of the universal joint are connected to the liquid storage joint and the jet joint respectively. The jet joint includes a mixing chamber and two tail fin drive discs. The two tail fin drive discs are disposed opposite to each other at both ends of the mixing chamber. The mixing chamber has multiple jet ports. The multiple jet ports are arranged in a ring-shaped layer, and the jet ports between adjacent layers are staggered.

2. The hydrogen pipeline pre-filming pigging device according to claim 1, characterized in that, The mixing chamber includes a cylinder and a gas-liquid mixer. The cylinder has a spiral air passage on its side wall. The spiral air passage, the gas-liquid mixer and the injection port are connected in sequence so that the corrosion inhibitor in the liquid storage section can be sprayed out through the injection port.

3. The hydrogen pipeline pre-filming pigging device according to claim 2, characterized in that, The gas-liquid mixer has multiple honeycomb-shaped holes; And / or, the injection port on the mixing chamber is provided with two layers, and the injection port is provided with an atomizing nozzle.

4. The hydrogen pipeline pre-filming pigging device according to claim 1, characterized in that, The tail fin drive disc includes multiple fan-shaped plates, which are arranged in multiple layers with the fan-shaped plates of adjacent layers being staggered and fitted together.

5. The hydrogen pipeline pre-filming pigging device according to claim 1, characterized in that, The liquid storage section includes a liquid storage tank and multiple support components. The multiple support components are arranged at equal intervals around the liquid storage tank. Each support component includes a support rod, a traveling wheel, and an elastic element. One end of the support rod is rotatably connected to the liquid storage tank, the traveling wheel is located at the other end of the support rod, and both ends of the elastic element are correspondingly connected to the support rod and the liquid storage tank.

6. The hydrogen pipeline pre-filming pigging device according to claim 5, characterized in that, The support assembly includes a first wheel group and a second wheel group, with the first wheel group located at one end of the liquid storage tank and the second wheel group located at the other end of the liquid storage tank.

7. The hydrogen pipeline pre-filming pigging device according to claim 5, characterized in that, The liquid storage chamber includes a first shaft section and a second shaft section. The inner diameter of the first shaft section is larger than the inner diameter of the second shaft section. The second shaft section is disposed near the injection section relative to the first shaft section. A piston is provided inside the liquid storage chamber. The piston has a first diameter section and a second diameter section. The first diameter section is adapted to the first shaft section, and the second diameter section is adapted to the second shaft section.

8. The hydrogen pipeline pre-filming pigging device according to claim 1, characterized in that, It also includes a signal transmitter, which is located on the liquid storage section and is used to send the location information of the hydrogen pipeline pre-filming pig to an external terminal.

9. The hydrogen pipeline pre-filming pigging device according to claim 1, characterized in that, It also includes a liquid level monitor, which is installed on the liquid storage section and is used to detect the remaining amount of corrosion inhibitor in the liquid storage section.

10. A pre-filming pigging system for hydrogen transportation pipelines, characterized in that, It includes a foam pig and a hydrogen pipeline pre-filming pig as described in any one of claims 1 to 9, wherein two foam pigs are provided, and the two foam pigs are located at both ends of the hydrogen pipeline pre-filming pig in the extension direction of the pipeline to be cleaned.

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