Method for constructing a hydrogen-carrying pipe system

Abstract

The application provides a construction method of a casing hydrogen transmission system. The construction method of the casing hydrogen transmission system comprises the following steps: preparing a plurality of casing assemblies, wherein each casing assembly comprises an inner pipe, an outer pipe and a support structure; sealing the pipe openings of the casing assemblies; transporting the prepared casing assemblies to a construction site; performing group welding on the casing assemblies, drawing the outer pipe of the casing out by a preset distance, performing group welding on the inner pipe, returning the outer pipe to the original position after the welding of the inner pipe is completed, and performing group welding on the outer pipe; and installing a pipeline accessory installation assembly at a preset position. According to the construction method of the casing hydrogen transmission system, the on-site construction problem of the casing hydrogen transmission system can be effectively solved, the construction requirements can be met, and the construction quality can be ensured.

Description

Technical Field

[0001] This invention relates to the field of hydrogen transportation system technology, and more specifically, to a construction method for a casing hydrogen transportation system. Background Technology

[0002] Given the characteristics of my country's energy distribution and demand, the western region has relatively abundant renewable energy sources such as wind, solar, and hydropower, while the eastern region has a larger energy demand. With the rapid development of the hydrogen energy industry, there will be a need for large-scale, low-cost transportation of produced hydrogen in the future. Utilizing pipeline hydrogen transportation is an effective way to solve the problem of large-scale, low-cost, long-distance hydrogen transportation.

[0003] In related technologies, due to the high cost of constructing dedicated hydrogen pipelines, hydrogen is primarily transported by blending it with natural gas and then using natural gas pipelines. However, this blending method presents a series of problems, such as hydrogen damage to natural gas steel pipelines, high limitations on blending ratios, and high energy consumption for hydrogen purification. When hydrogen-blended natural gas is used directly, issues arise such as reduced calorific value and the adaptability of terminal equipment to the blending ratio.

[0004] To address this, a sheathed hydrogen pipeline system has been proposed in related technologies. This system avoids hydrogen damage to the pipeline caused by hydrogen gas, eliminates the need for purification, and is cost-effective. In this system, high-pressure hydrogen gas flows through the inner pipe, while an equal-pressure protective gas is used between the inner and outer pipes, thus decoupling the hydrogen-bearing and pressure-bearing environments.

[0005] The on-site installation of a casing-type hydrogen transportation system is a crucial part of the entire project. Existing pressure pipeline installation processes include pipeline support installation, pipeline installation, pipeline welding and flaw detection, pipeline pressure testing and tightness testing, pipeline purging, and pipeline painting for corrosion protection. However, these methods are not suitable for casing-type hydrogen transportation systems. Therefore, there is currently a lack of an effective construction method for casing-type hydrogen transportation systems. Summary of the Invention

[0006] The main objective of this invention is to provide a construction method for a casing-type hydrogen transportation system, which can effectively solve the on-site construction problems of the casing-type hydrogen transportation system, meet the construction requirements, and ensure the construction quality.

[0007] To achieve the above objectives, according to one aspect of the present invention, a method for constructing a casing hydrogen transport system is provided, comprising:

[0008] Multiple sets of sleeve assemblies are prepared, each sleeve assembly including an inner tube, an outer tube, and a support structure;

[0009] Seal the pipe openings of each sleeve assembly;

[0010] The prepared casing assembly is transported to the construction site;

[0011] The sleeve assembly is subjected to group butt welding, the outer tube of the sleeve is pulled out by a preset distance, the inner tube is subjected to group butt welding, after the welding of the inner tube is completed, the outer tube is returned to the original position, and the outer tube is subjected to group butt welding.

[0012] The pipeline accessory installation assembly is installed at the preset position.

[0013] Further, the step of preparing the plurality of sleeve assemblies comprises:

[0014] The plurality of support structures are sleeved outside the inner tube and are arranged at intervals.

[0015] The outer tube is sleeved outside the inner tube from one end of the inner tube, so that the support structures are supported between the inner tube and the outer tube, and the pre-assembly of the sleeve assembly is completed.

[0016] Further, the step of performing group butt welding on the sleeve assembly, pulling out the outer tube of the sleeve by a preset distance, performing group butt welding on the inner tube, returning the outer tube to the original position after the welding of the inner tube is completed, and performing group butt welding on the outer tube comprises:

[0017] The seal of the sleeve assembly is removed, the sleeve assembly is centered, and the inner walls of the inner tube and the outer tube of the adjacent sleeve assembly are ensured to be flush.

[0018] The outer tube is pulled out by a preset distance, group butt welding is performed on the adjacent inner tube, and after the welding is completed, the weld is detected, and the welding opening that does not meet the requirements is repaired or re-welded.

[0019] The outer tube is pushed back to the original position, group butt welding is performed on the outer tube, and after the welding is completed, the weld is detected, and the welding opening that does not meet the requirements is repaired or re-welded, wherein the welding speed of the inner tube is faster than that of the outer tube.

[0020] Further, the step of performing group butt welding on the outer tube comprises:

[0021] Multi-layer welding is adopted to weld the adjacent outer tube.

[0022] The adjacent outer tube is subjected to backing welding, and after the backing welding reaches the preset position, the welded area is subjected to flaw detection, and after no defects are found, welding is continued.

[0023] After the welding of the outer tube is completed, the weld is subjected to flaw detection.

[0024] Further, before the step of performing flaw detection on the weld after the welding of the outer tube is completed, the step further comprises:

[0025] The welding position is subjected to penetration non-destructive testing.

[0026] Further, the step of preparing the plurality of sleeve assemblies comprises:

[0027] The inner tube and the outer tube of the sleeve assembly are bevelled;

[0028] The burrs, rust, and oil stains on the inner wall and the outer wall of the tube are cleaned.

[0029] Further, the support structure is in interference fit with the outer wall of the inner tube, and in clearance fit or transition fit with the inner wall of the outer tube.

[0030] Further, the pipeline accessory installation assembly includes a first pipeline accessory, a bypass pipe, and a second pipeline accessory, and the step of installing the pipeline accessory installation assembly at the preset position includes:

[0031] The pipeline accessory installation assembly is connected between the two adjacent pipeline assemblies at the preset position, so that the first pipeline accessory is located on the hydrogen conveying path, the second pipeline accessory is located on the shielding gas conveying path of the bypass pipe, and the bypass pipe and the first pipeline accessory are located on the outer circumferential sides of each other.

[0032] The bypass pipe is configured to be connected to the outer tubes of the two sleeve assemblies at the two ends of the pipeline accessory installation assembly, and is offset from one side of the outer tube to the direction away from the first pipeline accessory to avoid the first pipeline accessory.

[0033] Further, the pipeline accessory installation assembly further includes sleeve adapters, and the two ends of the first pipeline accessory are respectively provided with the sleeve adapters, and the first pipeline accessory is connected with the two adjacent sleeve assemblies through the sleeve adapters. The step of connecting the pipeline accessory installation assembly between the two adjacent pipeline assemblies at the preset position so that the first pipeline accessory is located on the hydrogen conveying path, the second pipeline accessory is located on the shielding gas conveying path of the bypass pipe, and the bypass pipe and the first pipeline accessory are located on the outer circumferential sides of each other includes:

[0034] Reserving an installation position of the pipeline accessory installation assembly between the first sleeve segment and the second sleeve segment;

[0035] Fixing and connecting the sleeve adapters to the first sleeve segment and the second sleeve segment;

[0036] Connecting the two hydrogen conveying pipelines with the two sleeve adapters one by one, so that the hydrogen conveying pipelines communicate with the first inner tube segment and the second inner tube segment;

[0037] Installing the first pipeline accessory between the two hydrogen conveying pipelines;

[0038] Connecting the bypass pipe with the two sleeve adapters, so that the two ends of the bypass pipe respectively communicate with the adapter cavities of the two sleeve adapters;

[0039] Installing the second pipeline accessory on the bypass pipe.

[0040] Further, the pipe accessory installation assembly further comprises sleeve adapters, the two ends of the first pipe accessory are respectively provided with the sleeve adapters, the first pipe accessory is connected with the two adjacent sleeve assemblies through the sleeve adapters, the pipe accessory installation assembly is connected between the two adjacent pipe assemblies, the first pipe accessory is located on the hydrogen conveying path, the second pipe accessory is located on the protective gas conveying path of the bypass pipe, and the bypass pipe and the first pipe accessory are located on the outer circumferential sides of each other, and the steps comprise:

[0041] Reserving an installation position of the pipe accessory installation assembly between the two adjacent pipe assemblies;

[0042] Fixing and connecting the sleeve adapters on the two adjacent sleeve assemblies;

[0043] Installing the first pipe accessory between the two hydrogen conveying pipes, so that the first pipe accessory and the two hydrogen conveying pipes are assembled;

[0044] Connecting the assembled hydrogen conveying pipe with the two sleeve adapters, so that the hydrogen conveying pipe is in communication with the two adjacent inner pipes;

[0045] Installing the second pipe accessory on the bypass pipe, so that the second pipe accessory and the bypass pipe are assembled;

[0046] Connecting the assembled bypass pipe with the two sleeve adapters, so that the two ends of the bypass pipe are in communication with the adapter cavities of the two sleeve adapters.

[0047] The sleeve hydrogen conveying system construction method comprises the following steps: preparing a plurality of sleeve assemblies, wherein each sleeve assembly comprises an inner pipe, an outer pipe and a support structure; sealing the pipe openings of the sleeve assemblies; conveying the prepared sleeve assemblies to a construction site; assembling and welding the sleeve assemblies, pulling out the outer pipe of the sleeve by a preset distance, assembling and welding the inner pipe, after the welding of the inner pipe is completed, returning the outer pipe to the original position, and assembling and welding the outer pipe; and installing a pipe accessory installation assembly at a preset position. The sleeve hydrogen conveying system construction method can facilitate the on-site construction of the sleeve hydrogen conveying system, realize the connection and installation between the sleeves, can be applied to the construction of the special pipe, i.e., the sleeve, can smoothly implement the on-site construction of the sleeve, can meet the installation of the pipe accessory connected with the inner pipe and the outer pipe, effectively solves the on-site construction problem of the sleeve hydrogen conveying system, meets the construction requirements, and guarantees the construction quality and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0048] The drawings constituting a part of the specification illustrate the present application and, together with the description, serve to explain the principles of the application. In the drawings:

[0049] Figure 1A construction method flow chart of the sleeve hydrogen pipeline system of the embodiment of the present application is shown; and

[0050] Figure 2 A mounting structure schematic diagram of the sleeve assembly and the pipeline accessory mounting assembly of the sleeve hydrogen pipeline system of the embodiment of the present application is shown.

[0051] Among them, the above drawings include the following reference signs:

[0052] 1, first outer pipe segment; 2, first inner pipe segment; 3, first annular gap; 4, second outer pipe segment; 5, second inner pipe segment; 6, second annular gap; 7, first pipeline accessory; 8, bypass pipe; 9, second pipeline accessory; 10, sleeve adapter; 11, inner connecting pipe; 12, outer connecting pipe; 13, adapter cavity; 14, lateral interface; 15, sealing plate; 16, hydrogen pipeline. DETAILED DESCRIPTION

[0053] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0054] Referring to Figure 1 and 2 , according to the embodiment of the present application, the sleeve hydrogen pipeline system includes a sleeve assembly and a pipeline accessory mounting assembly. The pipeline accessory mounting assembly is arranged between two sleeve assemblies at a preset position, and other adjacent sleeve assemblies without the pipeline accessory mounting assembly are directly butt-welded and sealed together.

[0055] The sleeve assembly includes an inner pipe, an outer pipe and a support structure, the support structure is arranged between the inner pipe and the outer pipe and is used for supporting the inner pipe, and an airflow passage is formed in the support structure, so that the protective gas between the inner pipe and the outer pipe can smoothly flow through the airflow passage of the support structure, avoiding hindering the flow of the protective gas.

[0056] The support structure is a whole structure, which can be a closed annular structure or a non-closed annular structure, when the support structure is a non-closed annular structure, it is an optimal arc structure and is arranged at the bottom of the inner pipe.

[0057] In order to facilitate the description, the two sleeve assemblies for mounting the pipeline accessory mounting assembly are defined as a first sleeve segment and a second sleeve segment, and the pipeline accessory mounting assembly is mounted between the first sleeve segment and the second sleeve segment.

[0058] The first sleeve segment includes a first outer pipe segment 1 and a first inner pipe segment 2, the first inner pipe segment 2 is sleeved in the first outer pipe segment 1 and forms a first annular gap 3 containing protective gas between the first outer pipe segment 1 and the first inner pipe segment 2.

[0059] The second sleeve section comprises a second outer tube section 4 and a second inner tube section 5, the second inner tube section 5 being sleeved in the second outer tube section 4 and forming a second annular gap 6 containing protective gas with the second outer tube section 4, and the first sleeve section and the second sleeve section are arranged at intervals.

[0060] The pipe accessory mounting assembly is connected between the first sleeve section and the second sleeve section and comprises a first pipe accessory 7, a bypass pipe 8 and a second pipe accessory 9.

[0061] The first pipe accessory 7 is arranged between the first inner tube section 2 and the second inner tube section 5 and is located on the hydrogen conveying path.

[0062] The first end of the bypass pipe 8 is in communication with the first annular gap 3, and the second end is in communication with the second annular gap 6, the bypass pipe 8 is located on the outer peripheral side of the first pipe accessory 7, and the bypass pipe 8 is offset from one side of the first outer tube section 1 and the second outer tube section 4 to a direction away from the first pipe accessory 7 to avoid the first pipe accessory 7.

[0063] The second pipe accessory 9 is arranged on the bypass pipe 8 and is located on the protective gas conveying path.

[0064] The sleeve hydrogen conveying system is reformed at the position where the pipe accessory is required to be arranged, the sleeve hydrogen conveying system is cut, the mounting position of the pipe accessory is left, then the bypass pipe 8 is added to avoid the first pipe accessory on the inner tube section, and since the bypass pipe 8 is arranged between the cut first outer tube section 1 and the second outer tube section 4, the interference problem caused by the sleeving of the outer tube section on the inner tube section at the mounting position of the first pipe accessory 7 can be avoided on the basis of ensuring the continuous conveying of the protective gas, the offset design of the bypass pipe 8 makes the installation of the first pipe accessory 7 and the second pipe accessory 9 not interfere with each other, and sufficient space for mounting the first pipe accessory 7 and the second pipe accessory 9 is left, which facilitates the installation and fixation of the pipe accessories on the inner tube section and the outer tube section, the installation structure is simple, the installation method is flexible, the installation difficulty of the pipe accessories is reduced, only part of the pipeline needs to be added in the whole process, the structure of the pipe accessories does not need to be reformed, the original structure is less reformed, the existing pipe accessories can be directly used for installation, the reform cost is low, and the problem of the installation of the flow meter, the valve, the intermediate pressure boosting facility and other pipe accessories in the sleeve hydrogen conveying system can be effectively solved, and large-scale, low-cost and long-distance hydrogen conveying can be facilitated.

[0065] The protective gas is inert gas such as nitrogen and helium.

[0066] In the embodiment, the first pipe accessory 7 and the second pipe accessory 9 are exposed to the outside, and the first pipe accessory 7 and the second pipe accessory 9 can be maintained and replaced. The installation structure of the first pipe accessory 7 and the second pipe accessory 9 is independent, and the first pipe accessory 7 and the second pipe accessory 9 can be maintained and replaced independently, which is convenient to operate and low in cost. In addition, the first pipe accessory 7 and the second pipe accessory 9 belong to the pipe accessory installation assembly, and the pipe accessory installation assembly is arranged independently of the first sleeve segment and the second sleeve segment. Therefore, the pipe accessory installation assembly can be replaced and maintained as a whole when needed, and the first sleeve segment and the second sleeve segment do not need to be adjusted, thereby reducing the difficulty of maintaining and replacing the pipe accessory and improving the replacement efficiency of the pipe accessory.

[0067] In one embodiment, the pipe accessory installation assembly further comprises a sleeve adapter 10. The first pipe accessory 7 is provided with the sleeve adapter 10 at both ends. The first pipe accessory 7 communicates with the first inner pipe segment 2 and the second inner pipe segment 5 through the sleeve adapter 10. The bypass pipe 8 communicates with the first annular gap 3 and the second annular gap 6 through the sleeve adapter 10.

[0068] In the embodiment, the pipe accessory is not directly connected to the first sleeve segment and the second sleeve segment based on the structure of the pipe accessory and the double-pipe characteristics of the sleeve hydrogen conveying system. Therefore, the pipe accessory is connected to the first sleeve segment and the second sleeve segment through the sleeve adapter 10. The sleeve adapter 10 can exist independently of the first sleeve segment, the second sleeve segment, and the pipe accessory. Therefore, the sleeve adapter 10 can be designed according to the connection characteristics of the sleeve segment and the pipe accessory, so that the sleeve adapter 10 can be used to connect the sleeve segment and the pipe accessory. In this way, the design difficulty of the connection structure between the sleeve segment and the pipe accessory can be reduced, and the design cost and processing cost can be reduced, and the efficiency can be improved. The sleeve adapter 10 is specially arranged for the connection structure of the sleeve segment and the pipe accessory. Therefore, the structural stability and the sealing performance of the sleeve segment and the pipe accessory after connection can be effectively ensured, and the sleeve hydrogen conveying system after connection can have better connection performance.

[0069] In the embodiment, the sleeve adapter 10 can connect the first pipe accessory 7 to the first sleeve segment and the second sleeve segment, and can also connect the bypass pipe 8 to the first annular gap 3 and the second annular gap 6. The structure of the first sleeve segment and the second sleeve segment is not damaged, and the replaceability is better.

[0070] In one embodiment, the casing adapter 10 comprises an inner connecting pipe 11 and an outer connecting pipe 12, the outer connecting pipe 12 is sleeved outside the inner connecting pipe 11 and forms an adapter cavity 13 with the inner connecting pipe 11, the adapter cavity 13 has an open end at a first end and a closed end at a second end, the open end of the adapter cavity 13 of one casing adapter 10 is connected with the first annular gap 3 of the first casing section, and the open end of the adapter cavity 13 of the other casing adapter 10 is connected with the second annular gap 6 of the second casing section.

[0071] In the embodiment, by forming the adapter cavity 13 on the casing adapter 10, the end sealing of the annular gap can be conveniently realized, the flow path of the protective gas is forced to be transferred from the annular gap of the casing section to the bypass pipe 8 through the adapter cavity 13, so that the gap between the two casing sections does not need to be filled, and the normal flow of the protective gas can still be ensured, and due to the transfer of the flow path of the protective gas, sufficient space can be left between the outer pipe sections of the two casing sections for installing the first pipe accessory 7 without affecting the normal function of the protective gas, so that the installation and subsequent operation of the first pipe accessory 7 become simpler and easier to realize.

[0072] The adapter cavity 13 on the casing adapter 10 is specially designed to have one open end and one closed end, the open end is convenient for connecting with the annular gap to realize the transfer of the protective gas, and the closed end is convenient for realizing the end sealing of the outer pipe section of the casing section, so that the interval between the two outer pipe sections can be realized without modifying the outer pipe section.

[0073] In one embodiment, a lateral interface 14 is formed on the outer connecting pipe 12, the lateral interface 14 is communicated with the adapter cavity 13, the first end of the bypass pipe 8 is connected with the lateral interface 14 of one casing adapter 10, and the second end of the bypass pipe 8 is connected with the lateral interface 14 of the other casing adapter 10.

[0074] In the embodiment, by forming the lateral interface 14 on the outer connecting pipe 12 of the casing adapter 10, the connection between the casing adapter 10 and the bypass pipe 8 can be conveniently realized, so that the bypass pipe 8 can be conveniently connected with the adapter cavity 13. In order to further facilitate the connection between the outer connecting pipe 12 and the bypass pipe 8, a lateral joint can be arranged on the side wall of the outer connecting pipe 12, and the lateral interface 14 is arranged on the lateral joint. The lateral joint can be provided with a connecting thread to facilitate the threaded connection between the bypass pipe 8, or can be provided as a protruding column protruding from the side wall of the outer connecting pipe 12, so as to facilitate the welding between the bypass pipe 8. Since the lateral joint protrudes laterally from the outer connecting pipe 12, when welding between the lateral joint and the bypass pipe 8 is performed, not only the welding difficulty can be reduced, but also the influence of the welding temperature on the outer connecting pipe 12 can be reduced, so as to ensure the structural strength of the outer connecting pipe 12.

[0075] In one embodiment, the outer connecting pipe 12 and the inner connecting pipe 11 are both sleeves, the first end of the outer connecting pipe 12 is spaced apart from the first end of the inner connecting pipe 11 to form an open end of the adapter cavity 13, and the second end of the outer connecting pipe 12 is sealingly connected to the inner connecting pipe 11 by the sealing plate 15 to form a closed end of the adapter cavity 13.

[0076] In the present embodiment, the sleeve adapter 10 is formed by fixed connection of two sleeves and a sealing plate 15, the two sleeves are coaxially arranged, and the adapter cavity 13 can be formed between the two sleeves. The sealing plate 15 is in the form of an annular plate, the outer periphery of the annular plate is welded and fixed to the outer sleeve, and the inner periphery of the annular plate is welded and fixed to the inner sleeve, thereby forming the adapter cavity 13 which is open at one end and closed at the other end. The length of the outer sleeve is shorter than the length of the inner sleeve, so that part of the inner sleeve protrudes out of the outer sleeve, facilitating the connection and fixation between the inner sleeve and the first pipe accessory 7.

[0077] In some embodiments, the sleeve adapter 10 can also be directly stamped or cast into shape.

[0078] In one embodiment, the first inner pipe section 2 protrudes out of the first outer pipe section 1, the end of the first outer pipe section 1 is sealed by the sealing plate 15 from the first inner pipe section 2, the first outer pipe section 1 is provided with a lateral interface 14, and the first end of the bypass pipe 8 is connected to the lateral interface 14 on the first outer pipe section 1; and / or, the second inner pipe section 5 protrudes out of the second outer pipe section 4, the end of the second outer pipe section 4 is sealed by the sealing plate 15 from the second inner pipe section 5, the second outer pipe section 4 is provided with a lateral interface 14, and the second end of the bypass pipe 8 is connected to the lateral interface 14 on the second outer pipe section 4.

[0079] In the present embodiment, as an alternative embodiment, the sleeve adapter 10 can be omitted, and a structure for facilitating connection with the first pipe accessory 7 and the second pipe accessory 9 can be formed by designing the first sleeve section and the second sleeve section. In the present embodiment, the lengths of the first inner pipe section 2 and the first outer pipe section 1 are designed differently, and the lengths of the second inner pipe section 5 and the second outer pipe section 4 are designed differently, so that the inner pipe section can protrude out of the outer pipe section, facilitating sealing of the end of the outer pipe section by the sealing plate 15 to achieve truncation of the outer pipe section, and facilitating installation and fixation of the first pipe accessory 7 by the protruding inner pipe section. The structure in which the inner pipe section and the outer pipe section are designed differently and the annular gap is sealed by the sealing plate 15 can replace the function of the sleeve adapter 10, and the lateral interface 14 provided on the outer pipe section also facilitates the provision of the bypass pipe 8, thereby facilitating the installation and fixation of the second pipe accessory 9.

[0080] In one embodiment, the sleeve adapter 10 is welded or threadedly connected to the first sleeve section and the second sleeve section, which can be selected as needed.

[0081] In one embodiment, the first pipe accessory 7 is connected with the hydrogen conveying pipe 16 at both ends, and after the casing adapter 10 is welded with the first casing section and the second casing section, the first pipe accessory 7 is welded with the casing adapter 10 through the hydrogen conveying pipe 16, and the second pipe accessory 9 is welded with the casing adapter 10 through the bypass pipe 8.

[0082] In the embodiment, by arranging the hydrogen conveying pipe 16 at both ends of the first pipe accessory 7, on one hand, the connection and fixation between the first pipe accessory 7 and the inner connecting pipe of the casing adapter 10 can be easily realized, and on the other hand, the first pipe accessory 7 can be conveniently connected and fixed. Since the hydrogen conveying pipe 16 is separately arranged, the length required can be cut according to the need, so that the installation requirement of the first pipe accessory 7 can be more easily met.

[0083] In the embodiment, by arranging the hydrogen conveying pipe 16 at both ends of the first pipe accessory 7, on one hand, the connection and fixation between the first pipe accessory 7 and the inner connecting pipe of the casing adapter 10 can be easily realized, and on the other hand, the first pipe accessory 7 can be conveniently connected and fixed. Since the hydrogen conveying pipe 16 is separately arranged, the length required can be cut according to the need, so that the installation requirement of the first pipe accessory 7 can be more easily met.

[0084] In one embodiment, the wall thicknesses of the first outer pipe section 1, the second outer pipe section 4 and the outer connecting pipe 12 of the casing adapter 10 are the same, and the wall thicknesses of the first inner pipe section 2, the second inner pipe section 5 and the hydrogen conveying pipe 16 are the same.

[0085] In one embodiment, the first pipe accessory 7 is a flow meter or a valve; and / or, the second pipe accessory 9 is a flow meter or a valve.

[0086] In combination with Figure 1 As shown in the drawings, according to the embodiment of the present application, the construction method of the casing hydrogen conveying system includes: preparing a plurality of casing assemblies, wherein each casing assembly includes an inner pipe, an outer pipe and a support structure; closing the pipe openings of the casing assemblies; transporting the prepared casing assemblies to the construction site; performing group welding on the casing assemblies, pulling out the outer pipe of the casing by a preset distance, performing group welding on the inner pipe, after the welding of the inner pipe is completed, returning the outer pipe to the original position, and performing group welding on the outer pipe; and installing a pipe accessory installation assembly at a preset position.

[0087] Through the above construction method, the components of the casing assembly can be prefabricated in the factory, so that the specifications of the casing assemblies can be preprocessed, and only welding is required at the site, which can reduce the difficulty of on-site construction and improve the efficiency of on-site construction.

[0088] Through the arrangement of the support structure, the inner pipe and the outer pipe of the casing can be prevented from directly contacting each other, and a uniform interlayer is formed between the inner pipe and the outer pipe, so as to facilitate the circulation of the protection gas.

[0089] After the various components of the casing assembly are processed, the inner tube and the outer tube need to be closed at the tube opening, so that the casing assembly will not damage the internal structure of the inner tube and the outer tube during transportation from the factory to the construction site, and also can avoid foreign matter entering the inner tube or the outer tube, to ensure the cleanliness of the internal pipeline and the stability and reliability of hydrogen transportation.

[0090] During the construction at the site, by adjusting the relative positions of the inner tube and the outer tube, the sealing connection between the inner tube and the inner tube and between the outer tube and the outer tube can be conveniently realized, so that the inner tube and the inner tube can be connected to form a hydrogen transportation channel, and the outer tube and the outer tube can be connected to form a protective gas channel.

[0091] In addition, by installing the pipe accessory installation assembly, the installation of the pipe accessories of the inner tube and the outer tube can be conveniently realized, and the installation of the pipe accessories of the inner tube can be realized while ensuring the communication of the hydrogen transportation channel of the inner tube, and the installation of the pipe accessories of the outer tube can be realized while ensuring the communication of the protective gas channel of the outer tube, so that the real-time monitoring of the hydrogen transportation state of the inner tube and the protective gas transportation state between the outer tube and the inner tube can be realized.

[0092] The construction method of the casing hydrogen transportation system can conveniently realize the on-site construction of the casing hydrogen transportation system, realize the connection and installation between the casings, can be applied to the construction of the special pipe casing, make the on-site construction of the casing smoothly implemented, meet the installation and setting of the pipe accessories connected with the inner tube and the outer tube, effectively solve the on-site construction problem of the casing hydrogen transportation system, meet the construction requirements, and ensure the construction quality and construction efficiency.

[0093] In one embodiment, the lengths of the inner tube and the outer tube are equivalent, being 10m-15m.

[0094] In one embodiment, the step of preparing a plurality of casing assemblies includes: sleeving a plurality of support structures outside the inner tube and spacing the plurality of support structures; and sleeving the outer tube outside the inner tube from one end of the inner tube, so that the support structures are supported between the inner tube and the outer tube, to complete the pre-assembly of the casing assembly.

[0095] In this embodiment, the casing assembly is closed at the tube opening after pre-assembly in the factory, which can not only make the complete casing assembly pre-assembled, avoid the time cost caused by searching for matching structures at the construction site, but also reduce the cost of closing the tube opening, so that the single tube opening of the inner tube and the outer tube can be closed at one time, the operation is more convenient, and in addition, the casing assembly is pre-assembled and then transported to the construction site, which is convenient for transportation and reduces the amount of on-site construction.

[0096] In the process of pipe laying, the casing assembly can be unloaded along the preset pipe laying route using a crane or a special tool, arranged in a linear abutment, and temporarily fixed and supported.

[0097] In one embodiment, the casing assembly is subjected to group welding, the outer pipe of the casing is extracted by a preset distance, the inner pipe is subjected to group welding, and after the welding of the inner pipe is completed, the outer pipe is returned to the original position, and the outer pipe is subjected to group welding. The steps of the outer pipe group welding include: removing the seal of the casing assembly, centering the casing assembly, and ensuring that the inner walls of the inner pipes and outer pipes of adjacent casing assemblies are flush; the outer pipe is extracted by a preset distance, the adjacent inner pipes are subjected to group welding, and after the welding is completed, the weld is detected, and the defective weld is repaired or re-welded; the outer pipe is returned to the original position, and the outer pipe is subjected to group welding, and after the welding is completed, the weld is detected, and the defective weld is repaired or re-welded, wherein the welding speed of the inner pipe is faster than that of the outer pipe.

[0098] The steps of the outer pipe group welding include: using multi-layer welding to weld adjacent outer pipes; the adjacent outer pipes are subjected to backing welding, and after the backing welding reaches a preset position, the welded area is subjected to flaw detection, and after no defects are found, the welding is continued; after the outer pipe welding is completed, the weld is subjected to flaw detection.

[0099] In this embodiment, the group welding process between the casing assemblies is as follows:

[0100] The seal of the casing assembly is removed, the casing assembly is centered, and the inner walls of the inner pipes and outer pipes of adjacent casing assemblies are ensured to be flush.

[0101] The outer pipe of the casing assembly is extracted by a distance, and the inner pipe of the casing assembly is subjected to group welding first. After the welding is completed, the weld is subjected to one-time X-ray flaw detection, and the defective weld is repaired or re-welded. The pipe wall of the inner pipe is relatively thin, so the welding speed is fast and uniform.

[0102] Then the outer pipe of the casing assembly is returned to the original position, and the outer pipe is subjected to group welding. The pipe wall of the outer pipe is relatively thick, so multi-layer welding can be used. During the multi-layer welding, each layer of weld is completed at one time, and the slag between the weld layers is cleaned in time. For welds with a pipe wall thickness of more than 20 mm, X-ray flaw detection is performed when the backing welding is welded to 10-15 mm from the inner wall of the pipe, and the welding can continue after no defects are found. After the welding is completed, the weld is subjected to X-ray flaw detection, and the defective weld is repaired or re-welded.

[0103] Before the X-ray detection of the outer pipe, penetration non-destructive testing can also be performed to timely find thermal cracks.

[0104] The inner tube and the outer tube of the sleeve assembly are argon or other protective gas filled when being tack welded.

[0105] In one embodiment, the step of preparing the plurality of sleeve assemblies comprises: welding beveling the tube mouths of the inner tube and the outer tube of the sleeve assembly; and cleaning the burrs, rust, and oil stains generated on the inner wall and the outer wall of the tube mouths.

[0106] In one embodiment, the support structure is in interference fit with the outer wall of the inner tube, and in clearance fit or transition fit with the inner wall of the outer tube, which can avoid movement of the support structure along with the installation of the outer tube during the installation of the outer tube, and ensure the reliability and stability of the installation position of the support structure, and further ensure the support effect of the support structure on the inner tube.

[0107] In one embodiment, the step of installing the pipe accessory installation assembly at the predetermined position comprises:

[0108] The pipe accessory installation assembly is connected between the first sleeve segment and the second sleeve segment, such that the first pipe accessory 7 is located on the hydrogen conveying path, the second pipe accessory 9 is located on the protective gas conveying path of the bypass pipe 8, and the bypass pipe 8 and the first pipe accessory 7 are located on the peripheral side of each other; the bypass pipe 8 is configured to be connected to the outer tubes of the two sleeve assemblies at both ends of the pipe accessory installation assembly, and is offset from one side of the outer tube to the direction away from the first pipe accessory 7 to avoid the first pipe accessory 7.

[0109] In the present embodiment, since the two sleeve assemblies in which the pipe accessory installation assembly is installed are the first sleeve segment and the second sleeve segment, the first sleeve segment comprises a first outer tube segment 1 and a first inner tube segment 2, the first inner tube segment 2 is sleeved in the first outer tube segment 1 and forms a first annular gap 3 containing protective gas with the first outer tube segment 1, the second sleeve segment comprises a second outer tube segment 4 and a second inner tube segment 5, the second inner tube segment 5 is sleeved in the second outer tube segment 4 and forms a second annular gap 6 containing protective gas with the second outer tube segment 4, and the first sleeve segment and the second sleeve segment are arranged in a spaced manner, therefore, the bypass pipe 8 is configured to be connected to the first outer tube segment 1 at one end and to the second outer tube segment 4 at the other end, and is offset from the same side of the first outer tube segment 1 and the second outer tube segment 4 to the direction away from the first pipe accessory 7, so as to avoid the first pipe accessory 7.

[0110] By the pipeline accessory installation method, the first outer pipe section 1 and the second outer pipe section 4 are disconnected at the installation position of the first pipeline accessory 7 to form a bypass structure, so that the hydrogen conveying pipeline at the disconnected position of the first outer pipe section 1 and the second outer pipe section 4 can be exposed and not surrounded by the first outer pipe section 1 and the second outer pipe section 4, thereby leaving enough space for the installation of the first pipeline accessory 7 and avoiding the interference of the first outer pipe section 1 and the second outer pipe section 4 with the installation of the first pipeline accessory 7, so that the first pipeline accessory 7 can be conveniently installed on the hydrogen conveying pipeline to detect or control the hydrogen flowing through the hydrogen conveying pipeline.

[0111] Since the first outer pipe section 1 and the first inner pipe section 2 form the first annular gap 3 for containing the protective gas, the second outer pipe section 4 and the second inner pipe section 5 form the second annular gap 6 for containing the protective gas, and the first annular gap 3 and the second annular gap 6 are communicated through the bypass pipe 8, although the first outer pipe section 1 and the second outer pipe section 4 are disconnected, the protective gas can still be communicated through the bypass pipe 8 and will not affect the flow of the protective gas. The bypass pipe 8 is offset by a preset distance away from the first pipeline accessory 7, so that the bypass pipe 8 and the first pipeline accessory 7 can have enough spacing, thereby enabling the installation of the second pipeline accessory 9 on the bypass pipe 8, so that the installation of the first pipeline accessory 7 and the installation of the second pipeline accessory 9 will not interfere with each other.

[0112] In one embodiment, the pipeline accessory installation assembly is connected between the first sleeve section and the second sleeve section, so that the first pipeline accessory 7 is located on the hydrogen conveying path, the second pipeline accessory 9 is located on the protective gas conveying path of the bypass pipe 8, and the bypass pipe 8 and the first pipeline accessory 7 are located on the outer peripheral sides of each other. The step includes: reserving an installation position of the pipeline accessory installation assembly between the first sleeve section and the second sleeve section; fixedly connecting the sleeve adapter 10 to the first sleeve section and the second sleeve section; connecting the two hydrogen conveying pipelines 16 to the two sleeve adapters 10 one by one, so that the hydrogen conveying pipeline 16 communicates with the first inner pipe section 2 and the second inner pipe section 5; installing the first pipeline accessory 7 between the two hydrogen conveying pipelines 16; connecting the bypass pipe 8 with the two sleeve adapters 10, so that the two ends of the bypass pipe 8 respectively communicate with the adapter cavities 13 of the two sleeve adapters 10; and installing the second pipeline accessory 9 on the bypass pipe 8.

[0113] In the present embodiment, when installing the pipeline accessories, a sufficient installation space of 1-2 m is first reserved at the position of the to-be-installed pipeline accessories in the casing hydrogen conveying system, then the two casing adapters 10 are respectively welded with the first casing section and the second casing section, the inner connecting pipes 11 of the casing adapters 10 are respectively welded with a hydrogen conveying pipeline 16, the lateral interfaces 14 of the casing adapters 10 are respectively welded with a bypass pipe 8 with an elbow, the two hydrogen conveying pipelines 16 are aligned in axis, and the installation space of the first pipeline accessory 7 is reserved, the two bypass pipes 8 are used for aligning the pipeline section axis of the second pipeline accessory 9, and the installation space of the second pipeline accessory 9 is reserved, finally, the first pipeline accessory 7 and the second pipeline accessory 9 are placed in the reserved installation positions, and the inlet and outlet adapters are welded with the corresponding pipelines. After the installation is completed, sealing inspection is required, and for the welded structure, radiographic inspection is required for the weld position to ensure the reliability of the welded structure and avoid problems such as insecure welding.

[0114] In other embodiments, the two casing adapters 10 can be respectively screwed with the first casing section and the second casing section, the hydrogen conveying pipeline 16 can be screwed with the inner connecting pipe 11 of the casing adapter 10, and the bypass pipe 8 can be screwed with the casing adapter.

[0115] In the present embodiment, since the casing adapter 10 is installed first in the installation process, the installation space left by the hydrogen conveying pipeline 16 and the first pipeline accessory 7 can facilitate the welding of the first outer pipeline section 1 and the second outer pipeline section 4 with the outer connecting pipe 12 from the outside, facilitate the welding between the first inner pipeline section 2 and the second inner pipeline section 5 and the inner connecting pipe 11 from the inner hole position of the inner connecting pipe 11, and can leave a welding path. After the welding at these positions is completed, the remaining welding work is the welding of single-pipe structures, not the welding of casings, so the entire welding process becomes simple to operate and can be operated according to the conventional welding mode.

[0116] In one embodiment, the step of connecting the pipe fitting installation assembly between the first sleeve segment and the second sleeve segment, so that the first pipe fitting 7 is located on the hydrogen conveying path, the second pipe fitting 9 is located on the shielding gas conveying path of the bypass pipe 8, and the bypass pipe 8 and the first pipe fitting 7 are located on the peripheral side of each other, comprises: reserving an installation position of the pipe fitting installation assembly between the first sleeve segment and the second sleeve segment; fixedly connecting the sleeve adapter 10 on the first sleeve segment and the second sleeve segment; installing the first pipe fitting 7 between the two hydrogen conveying pipes 16, so that the first pipe fitting 7 and the two hydrogen conveying pipes 16 are assembled; connecting the hydrogen conveying pipe 16 after assembly with the two sleeve adapters 10, so that the hydrogen conveying pipe 16 communicates with the first inner pipe segment 2 and the second inner pipe segment 5; installing the second pipe fitting 9 on the bypass pipe 8, so that the second pipe fitting 9 and the bypass pipe 8 are assembled; connecting the bypass pipe 8 after assembly with the two sleeve adapters 10, so that the two ends of the bypass pipe 8 respectively communicate with the adapter cavities 13 of the two sleeve adapters 10.

[0117] In the present embodiment, it is basically the same as the previous embodiment, except that in the present embodiment, the hydrogen conveying pipe 16 and the first pipe fitting 7 are first assembled to form a first installation assembly, and the bypass pipe 8 and the second pipe fitting 9 are assembled to form a second installation assembly, and then the first installation assembly is integrally installed between the inner connecting pipes 11 of the two sleeve adapters 10 for welding, and the second installation assembly is installed at the lateral interfaces 14 of the two sleeve adapters 10 for welding, and finally the installation of the entire pipe fitting is completed.

[0118] It is to be understood that the terms used herein are for the purpose of describing specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof.

[0119] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and above-described drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It will be understood that the data used in this way can be interchanged, where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0120] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A method of constructing a casing hydrogen delivery system, characterized by, include: Multiple sets of sleeve assemblies are prepared, each sleeve assembly including an inner tube, an outer tube, and a support structure; Seal the pipe openings of each sleeve assembly; The prepared casing assembly is transported to the construction site; The sleeve assembly is assembled and welded. The outer tube of the sleeve is pulled out by a preset distance, and the inner tube is assembled and welded. After the inner tube is welded, the outer tube is returned to its original position, and the outer tube is assembled and welded. Install the pipe fitting installation components at the preset locations; The steps for preparing multiple sets of bushing assemblies include: Multiple support structures are fitted over the inner tube, and the multiple support structures are arranged at intervals. The outer tube is fitted over the inner tube from one end, so that the support structure is supported between the inner and outer tubes, thus completing the pre-assembly of the sleeve assembly. The pipe fitting installation assembly includes a first pipe fitting (7), a bypass pipe (8), and a second pipe fitting (9). The pipe fitting installation assembly also includes a sleeve adapter (10). The sleeve adapter (10) is provided at both ends of the first pipe fitting (7). The first pipe fitting (7) is connected to two adjacent sleeve assemblies through the sleeve adapter (10). The step of installing the pipe fitting installation assembly at the preset position includes: Connect the pipe fitting installation assembly between two pre-set adjacent pipe assemblies such that the first pipe fitting (7) is located on the hydrogen delivery path and the second pipe fitting (9) is located on the protective gas delivery path of the bypass pipe (8), and the bypass pipe (8) and the first pipe fitting (7) are located on each other's outer periphery. The bypass pipe (8) is configured to connect to the outer pipe of the two sleeve assemblies at both ends of the pipe fitting installation assembly, and is offset from one side of the outer pipe in a direction away from the first pipe fitting (7) to avoid the first pipe fitting (7).

2. The construction method according to claim 1, characterized in that, The assembly and welding of the bushing assembly involves pulling the outer tube of the bushing out a predetermined distance, assembling and welding the inner tube, and then returning the outer tube to its original position after the inner tube welding is completed. The steps for assembling and welding the outer tube include: Remove the seal from the sleeve assembly, align the sleeve assembly, and ensure that the inner and outer walls of the inner and outer tubes of adjacent sleeve assemblies are flush. The outer tube is pulled out to a preset distance, and the adjacent inner tubes are assembled and welded. After the welding is completed, the weld is inspected, and any welds that do not meet the requirements are repaired or re-welded. Push the outer tube back to its original position and perform assembly welding of the outer tube. After the welding is completed, inspect the weld and repair or re-weld any welds that do not meet the requirements. The welding speed of the inner tube is faster than that of the outer tube.

3. The construction method according to claim 2, characterized in that, The steps for assembling and welding the outer tube include: Multi-layer welding is used to weld adjacent outer pipes; Perform root pass welding on adjacent outer pipes, and when the root pass welding reaches the preset position, perform flaw detection on the welded area. After confirming that there are no defects, continue welding. After the outer tube welding is completed, the weld is inspected for defects.

4. The construction method according to claim 3, characterized in that, The step of performing flaw detection on the weld after the outer tube welding is completed also includes: Penetrant nondestructive testing was performed on the welded areas.

5. The construction method according to claim 1, characterized in that, The steps for preparing multiple sets of sleeve assemblies include: The ends of the inner and outer tubes of the bushing assembly are welded and beveled. Clean the burrs, rust, and oil stains from the inner and outer walls of the pipe opening.

6. The construction method according to claim 1, characterized in that, The support structure is in interference fit with the outer wall of the inner tube, in clearance fit or transition fit with the inner wall of the outer tube.

7. The construction method according to claim 6, characterized in that, The step of connecting the pipeline accessory installation assembly between the two adjacent pipeline assemblies includes: Reserving installation positions of the pipeline accessory installation assembly between the first and second sleeve segments; Fixing the sleeve adapter (10) to the first and second sleeve segments; Connecting the two hydrogen delivery pipelines (16) to the two sleeve adapters (10) one by one, so that the hydrogen delivery pipelines (16) communicate with the first and second inner tube segments (2, 5); Installing the first pipeline accessory (7) between the two hydrogen delivery pipelines (16); Connecting the bypass pipe (8) to the two sleeve adapters (10), so that the two ends of the bypass pipe (8) communicate with the adapter cavities (13) of the two sleeve adapters (10), respectively; Installing the second pipeline accessory (9) on the bypass pipe (8).

8. The construction method according to claim 6, characterized in that, The step of connecting the pipeline accessory installation assembly between the two adjacent pipeline assemblies includes: Reserving installation positions of the pipeline accessory installation assembly between the two adjacent pipeline assemblies; Fixing the sleeve adapter (10) to the two adjacent sleeve assemblies; Installing the first pipeline accessory (7) between the two hydrogen delivery pipelines (16), so that the first pipeline accessory (7) and the two hydrogen delivery pipelines (16) are assembled; Connecting the assembled hydrogen delivery pipelines (16) to the two sleeve adapters (10), so that the hydrogen delivery pipelines (16) communicate with the two adjacent inner tubes; Installing the second pipeline accessory (9) on the bypass pipe (8), so that the second pipeline accessory (9) and the bypass pipe (8) are assembled; Connecting the assembled bypass pipe (8) to the two sleeve adapters (10), so that the two ends of the bypass pipe (8) communicate with the adapter cavities (13) of the two sleeve adapters (10), respectively.

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