Solid pipeline for introducing hydrogen and preparation method thereof

Abstract

The invention relates to the technical field of hydrogen storage, and discloses a solid pipeline for introducing hydrogen, which comprises a pipe body and a filling body, the pipe body is made of copper metal, and the filling body is formed by sintering magnesium powder. The preparation method comprises the following steps: S1, raw material preparation, filling and packaging; magnesium powder and a copper pipe with one sealed end are selected as raw materials, the copper pipe is filled with the magnesium powder in a vacuum glove box, and then the other end of the filled copper pipe is blocked; s2, processing the copper pipe; s2, the copper pipe with the two sealed ends in the S1 is subjected to cyclic operation of at least one time of drawing, cleaning and annealing treatment and then is subjected to quenching treatment, and a thin copper pipe containing compact magnesium powder is prepared; s3, finished product processing; and S2, the thin copper pipe containing the compact magnesium powder in the step S2 is machined and cut into the needed length and shape, surface treatment is conducted, and finally the solid pipeline for hydrogen introduction is manufactured. According to the technical scheme, the problems of long gas washing period, hydrogen residue, high pipeline tempering risk and the like of an existing hydrogen feeding pipeline can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen storage, and in particular to a solid pipe for passing hydrogen and a preparation method thereof. Background Art

[0002] In the hydrogen energy application system, hydrogen storage technology is an extremely critical link. Based on the physical properties of hydrogen, the current mainstream hydrogen storage methods include four categories: high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage, organic liquid hydrogen storage and solid hydrogen storage.

[0003] In the practical application of these hydrogen storage technologies, the transfer of hydrogen between different containers is involved, which requires the support of hydrogen pipelines. At the same time, many existing instruments and equipment have widely used hydrogen, making the application of hydrogen pipelines increasingly common. However, the current mainstream hydrogen pipelines mostly use hollow copper tubes or stainless steel tubes. These traditional pipelines have a series of problems that cannot be ignored. First, the gas washing cycle is long, which undoubtedly increases the consumption of hydrogen; second, there is a phenomenon of residual hydrogen. Once a fault occurs, it is easy to cause pipeline flashback, which poses a major safety hazard. Summary of the invention

[0004] The present invention aims to provide a solid pipe for hydrogen flow and a preparation method thereof, so as to solve the problems existing in the existing hydrogen flow pipe, such as long gas washing cycle, residual hydrogen and high risk of pipe flashback.

[0005] To achieve the above object, the present invention adopts the following technical solution: a solid pipe for hydrogen flow, including a pipe body and a filling body, the pipe body is made of copper metal, and the filling body is sintered from magnesium powder.

[0006] The beneficial effects of this solution are as follows: the solid pipe for hydrogen provided by the present invention is composed of a pure copper tube and magnesium powder, and has many significant advantages over existing hollow copper tubes or stainless steel tubes. On the one hand, the good thermal conductivity of the copper tube provides a stable environmental basis for hydrogen transmission. And magnesium powder, as a hydrogen storage material medium, greatly optimizes the transmission process of hydrogen. It not only ensures the smooth flow of hydrogen in the pipeline, but also significantly shortens the equipment washing time and greatly reduces hydrogen consumption. At the same time, magnesium hydride powder can deeply purify hydrogen during hydrogen transmission, effectively ensuring the high purity of hydrogen and meeting various application scenarios with strict requirements on hydrogen purity.

[0007] On the other hand, the pipeline has outstanding advantages in terms of safety performance. After use, it can effectively absorb the residual hydrogen in the pipeline to avoid potential risks caused by residual hydrogen. At the same time, it can also effectively prevent the occurrence of flashback when equipment fails, the environment is abnormal, or there is a problem with hydrogen supply, providing a more reliable safety guarantee for hydrogen energy applications and comprehensively improving the stability and safety of the entire hydrogen energy application system.

[0008] Preferably, the hydrogen content in the magnesium powder is 1000-3500 ppm, and the oxygen content is less than 500 ppm.

[0009] The beneficial effects of this scheme are as follows: magnesium powder containing a certain hydrogen content is more stable than pure magnesium powder, which can improve the safety of the preparation process; at the same time, controlling the hydrogen content within this range can avoid affecting the pre-sintering effect due to excessive hydrogen content, and prevent excessive pressure in the tube from being released during annealing and causing rupture; magnesium hydride powder can further purify hydrogen to ensure the purity of hydrogen; low oxygen content helps to reduce the impact of impurities on the hydrogen storage performance of magnesium powder, ensuring the good hydrogen absorption and desorption capacity of magnesium powder.

[0010] Preferably, the particle size of the magnesium powder is 0-150 μm.

[0011] The beneficial effects of this solution are: within this range of magnesium powder particle size, the finer the powder, the larger the specific surface area, the better the powder activity, and the more conducive it is to the material absorbing and releasing hydrogen, thereby improving the storage and transportation efficiency of the pipeline for hydrogen.

[0012] Preferably, the copper tube has a purity of 99.95% or more, an outer diameter of 12-60 mm, an inner diameter of 10-50 mm, and a length of 300-1000 mm.

[0013] The beneficial effects of this solution are: high-purity copper tubes have better thermal conductivity and corrosion resistance, which can ensure the stability and reliability of the pipeline during the hydrogen flow process; the appropriate outer diameter, inner diameter and length range can meet the installation and use requirements of the hydrogen flow pipeline in different scenarios.

[0014] The present invention also provides another technical solution, a method for preparing a solid pipe for hydrogen flow, comprising the following steps:

[0015] S1: Raw material preparation and filling packaging; magnesium powder and a copper tube with one end sealed are selected as raw materials. In a vacuum glove box, magnesium powder is filled into the copper tube, and then the other end of the filled copper tube is sealed;

[0016] S2: copper tube processing; copper tube processing; the copper tube sealed at both ends in S1 is subjected to at least one cycle of drawing, cleaning and annealing, and then quenched to obtain a thin copper tube containing dense magnesium powder.

[0017] S3: Finished product processing: the thin copper tube containing dense magnesium powder in S2 is processed and cut into the required length and shape, and surface treated to finally make a solid pipe for hydrogen flow.

[0018] The beneficial effect of this solution is that in actual scenarios such as instruments and equipment, hydrogen storage and supply, the method for preparing a solid pipe for hydrogen flow of the present invention has significant advantages.

[0019] From the perspective of performance innovation, the solid pipe composed of pure copper tube and magnesium powder prepared by the preparation method provided in this application is an ideal substitute for traditional hollow copper tube and stainless steel tube. Copper can maintain a stable temperature environment in the pipeline during hydrogen transportation due to its good thermal conductivity, ensuring the stability of hydrogen transportation; magnesium powder, as a hydrogen storage material medium, ensures the smooth flow of hydrogen in the pipeline.

[0020] In terms of high-efficiency energy saving, cost reduction and efficiency improvement, for equipment that frequently uses hydrogen, such as hydrogen-protected sintering furnaces and reduction furnaces, the presence of magnesium powder can significantly shorten the equipment's gas washing time, reduce hydrogen consumption, improve equipment's working efficiency, and reduce operating costs.

[0021] In terms of quality assurance, in processes with strict requirements on hydrogen purity, magnesium hydride powder can further purify hydrogen during hydrogen transportation to meet high purity requirements.

[0022] Safety upgrade, eliminate hidden dangers. After the hydrogen is used up, the pipeline can effectively absorb the residual hydrogen to avoid safety hazards. Taking the hydrogen-protected sintering furnace and reduction furnace as an example, these devices need to ignite the discharged hydrogen after using hydrogen. During the hydrogen ignition process, if the hydrogen purity is insufficient or the oxygen in the equipment and pipeline is not completely eliminated, it is very likely to cause deflagration, resulting in flashback of the hydrogen pipeline; similarly, during the hydrogen combustion and emission process, equipment failure, operating errors or insufficient gas supply may also cause flashback. Flashback is the phenomenon of hydrogen burning in the reverse direction along the hydrogen supply path, especially in some processes that require concentrated sulfuric acid to dry hydrogen. If not handled properly, the consequences are disastrous. Traditional hollow pipes cannot prevent hydrogen combustion during flashback, and will not stop until the hydrogen is exhausted. The powder in the solid pipe prepared in this application can immediately block the hydrogen supply, prevent hydrogen from continuing to burn in the reverse direction, effectively prevent flashback, and provide a solid guarantee for hydrogen safety.

[0023] In addition, the drawing, cleaning, annealing and quenching processes in the preparation method are mature, and the process parameters are controllable, which ensures the stability and repeatability of the preparation process, is conducive to large-scale production, and meets the growing market demand.

[0024] Preferably, in S1, the mass of the required magnesium powder is calculated according to the internal volume of the copper tube and the drawing ratio, ensuring that the volume density of the magnesium powder in the copper tube is maintained at 0.7-1.2 g / cm 3 .

[0025] The beneficial effect of this solution is that in the preparation process of the solid pipe for hydrogen flow, accurately calculating the mass of magnesium powder and strictly controlling its volume density are key links to ensure excellent product performance.

[0026] Precise control of these two parameters allows the magnesium powder to be evenly distributed in the copper tube, with just the right amount of filling. From a practical application point of view, this advantage is extremely significant. During the hydrogen transportation process, the evenly distributed magnesium powder will not cause blockage inside the pipeline, opening up a smooth channel for hydrogen circulation, ensuring that hydrogen can reach each user terminal efficiently and stably. At the same time, the appropriate filling amount allows the magnesium powder to fully exert its hydrogen storage function.

[0027] From the perspective of processing technology, the impact of volume density on the drawing process cannot be underestimated. Once the volume density is too large, the magnesium powder will quickly reach a dense state during drawing, limiting the overall drawing deformation, and the copper tube will be difficult to stretch to the designed size, resulting in the final product specifications not meeting the requirements and failing to meet the precise requirements for pipe size in actual use scenarios. On the contrary, if the volume density is too small, although the deformation increases during drawing, even if the designed size is reached, the density of the magnesium powder will be difficult to meet the standard.

[0028] Preferably, in S2, the copper tube drawing process is: using multiple groups of die holes with different diameters, sequentially drawing the copper tube, each deformation amount is controlled at 10-60%, and the die hole diameter is 0.1-0.5% larger than the design diameter.

[0029] The beneficial effect of this scheme is that in the manufacture of solid copper tubes for hydrogen, the scientific application of drawing technology is particularly critical. This scheme uses multiple groups of die holes with different diameters to draw in sequence, strictly controlling the deformation amount each time to 10-60%, and the die hole diameter is 0.1-0.5% larger than the designed diameter, which brings significant advantages.

[0030] From the perspective of the stability of the hydrogen transmission system, this precise control allows the copper tube to gradually reach the designed size, effectively avoiding the risk of rupture due to excessive deformation, ensuring smooth drawing and high dimensional accuracy. This makes the copper tube fit tightly with the hydrogen transmission system equipment and the connection is stable, laying a solid foundation for the safe and efficient transmission of hydrogen.

[0031] In terms of pipeline durability, drawing makes the internal grains of the copper tube elongated and refined, the organizational structure dense, and the strength, toughness and wear resistance significantly improved. It can easily cope with the pressure and stress of hydrogen transmission, greatly extend the service life and reduce replacement costs.

[0032] In terms of hydrogen transmission efficiency, drawing gives the copper tube a smooth surface, reduces hydrogen flow resistance, improves transmission efficiency, ensures hydrogen purity, prevents internal corrosion of the pipeline, and improves corrosion resistance.

[0033] In terms of production costs, drawing does not require a large amount of cutting materials, has high material utilization, reduces costs and enhances economic competitiveness.

[0034] In terms of production and supply, drawing can be carried out continuously to quickly meet market demand, ensure stable product quality, and help the rapid advancement of the hydrogen project.

[0035] Preferably, in S2, after the copper tube is drawn, its surface needs to be cleaned, and the cleaning liquid is an acid cleaning liquid.

[0036] The beneficial effects of this solution are: there will be oxide layers, oil stains and impurities on the surface of the copper tube after drawing. Using pickling solution to clean can effectively remove these substances, improve the surface quality of the copper tube, and facilitate subsequent annealing and quenching processes, thereby improving the overall performance of the pipeline.

[0037] Preferably, in S2, after the surface of the copper tube is cleaned, annealing treatment is then performed, and the annealing process is: in a vacuum environment, the temperature is uniformly increased at a heating rate of 5-10°C / min to an annealing temperature of 400-500°C, and the temperature is kept for 0.5-2h.

[0038] The beneficial effect of this solution is that in the production process of solid pipes for hydrogen, the copper pipe needs to undergo continuous multi-pass drawing, which will inevitably produce work hardening. Work hardening will reduce the plasticity and toughness of the copper pipe, which will have an adverse effect on subsequent processing operations and actual performance. Therefore, annealing treatment becomes a crucial link.

[0039] Annealing in a vacuum environment can isolate oxygen from the source, effectively prevent oxidation of the copper tube, ensure that the purity of the copper tube material is not affected, and lay a good foundation for subsequent processes.

[0040] During the annealing process, the heating rate, annealing temperature and holding time are key parameters that need to be precisely controlled. By setting these parameters scientifically and reasonably, the internal structure of the copper tube can be rearranged, thereby effectively eliminating the internal stress generated during the processing. With the elimination of internal stress, the softness and ductility of the copper tube are significantly improved, which not only makes the copper tube easier to form in subsequent processing and meet different processing requirements, but also in actual hydrogen transmission applications, it can better adapt to various complex working conditions, withstand the pressure and stress changes during hydrogen transmission, and ensure the stability of hydrogen transmission work.

[0041] It is worth mentioning that the magnesium powder filled in the copper tube will also undergo important changes during the annealing process. The specific annealing process allows the magnesium powder to bond with each other to form a stable structure, but it will not over-sinter to form alloying. This perfect state is very critical. It ensures the stability of the magnesium powder in the copper tube. Even after the copper tube is cut, the magnesium powder will not easily loosen and fall off, ensuring the integrity of the entire solid pipe structure for hydrogen and the reliability of its performance, which provides great convenience for subsequent installation, use and maintenance.

[0042] It should be noted that the annealing temperature and time have a decisive influence on the state of the magnesium powder. If the annealing temperature is too high or the time is too long, the magnesium powder will be completely sintered and alloyed, thereby losing its key role in the hydrogen flow process and failing to ensure the smooth transmission and storage of hydrogen; if the annealing temperature is too low or the time is too short, the magnesium powder cannot be fully bonded, the strength is low, and it is easy to loosen in the pipeline, and it also cannot meet the performance requirements of solid pipes for hydrogen flow. Therefore, precise control of annealing process parameters is the core of ensuring that the performance of solid pipes for hydrogen flow meets the standards.

[0043] Preferably, in S2, after the annealing and heat preservation of the copper tube is completed, it needs to be quenched to room temperature immediately, and the quenching method is any one of water quenching, oil quenching and air quenching.

[0044] The beneficial effects of this solution are: quenching treatment can prevent grain growth and maintain the softening effect of the copper tube. According to different needs, water quenching, oil quenching or air quenching can be selected to better control the performance of the copper tube to meet the requirements of solid pipes for hydrogen in different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a flow chart of preparing a solid pipe for hydrogen flow in Example 1 of the present invention. DETAILED DESCRIPTION

[0046] The following is further described in detail through specific implementation methods:

[0047] Example 1

[0048] A solid pipe for hydrogen flow includes a pipe body and a filling body, wherein the pipe body is made of copper metal and the filling body is sintered from magnesium powder. The hydrogen content of the magnesium powder is 1000-3500ppm, the oxygen content is less than 500ppm, and the particle size is 0-150μm; the purity of the copper pipe is more than 99.95%, the outer diameter is 12-60mm, the inner diameter is 10-50mm, and the length is 300-1000mm. In this embodiment, the hydrogen content of the magnesium powder is 1282ppm, the oxygen content is 375ppm, the particle size d10=15.9μm, d90=88.5μm; the purity of the copper pipe is 99.98%, the outer diameter is 12mm, the inner diameter is 10mm, the length is 500mm, and one end is sealed by laser welding with a 10mm thick copper plug.

[0049] A method for preparing a solid pipe for hydrogen flow, such as Figure 1 As shown, the following steps are included:

[0050] S1: Raw material preparation and filling packaging: magnesium powder and a copper tube with one end sealed are selected as raw materials. In a vacuum glove box, magnesium powder is filled into the copper tube, and then the other end of the filled copper tube is sealed. The mass of magnesium powder required is calculated according to the internal volume and drawing ratio of the copper tube to ensure that the volume density of magnesium powder in the copper tube is maintained at 0.7-1.2g / cm 3 .

[0051] In this embodiment, magnesium powder and a copper tube sealed by laser welding at one end with a 10 mm thick copper plug are selected as raw materials. According to the internal volume of the copper tube and the drawing ratio, the required mass of magnesium powder is 37.68 g to ensure that the volume density of magnesium powder in the copper tube is maintained at 1.0 g / cm 3 In a vacuum glove box, magnesium powder is accurately filled into the copper tube using a funnel technique without vibrating it. After filling, the other end of the copper tube is sealed with a 10mm thick copper plug using laser welding technology.

[0052] S2: copper tube processing; the copper tube sealed at both ends in S1 is subjected to at least one cycle of drawing, cleaning and annealing, and then quenched to obtain a thin copper tube containing dense magnesium powder;

[0053] S2.1: Drawing operation is performed on the copper tube sealed at both ends in S1. The copper tube drawing process is: using multiple groups of die holes with different diameters, the copper tube is drawn in sequence, and the deformation amount is controlled at 10-60% each time, and the die hole diameter is 0.1-0.5% larger than the designed diameter. In this embodiment, the copper tube drawing process is: spraying lubricant (using copper wire drawing oil produced by Jiangsu Yingji Lubrication Technology Co., Ltd.) on the surface of the copper tube sealed at both ends in S1, so that it is drawn through die holes of Φ10.05mm and Φ8.02mm in sequence, and a copper tube with an outer diameter of Φ8.007mm is obtained; in this process, the purpose of spraying lubricant is to reduce the friction resistance of the copper tube during the stretching process, thereby effectively preventing damage to the surface of the copper tube;

[0054] S2.2: After the copper tube is drawn, its surface needs to be cleaned. The cleaning liquid is an acid cleaning liquid, which is any one of sulfuric acid and hydrochloric acid. In this embodiment, hydrochloric acid with a concentration of 10% is used to clean the copper tube after the drawing treatment in S2.1 to obtain a copper tube with an outer diameter of Φ8.00mm;

[0055] S2.3: After the surface of the copper tube is cleaned, annealing treatment is performed. The annealing process is: in a vacuum environment, the temperature is uniformly increased at a heating rate of 5-10°C / min to an annealing temperature of 400-500°C, and the temperature is kept for 0.5-2h. In this embodiment, after the surface of the copper tube is cleaned, the temperature is uniformly increased at a heating rate of 10°C / min to an annealing temperature of 500°C in a vacuum environment, and the temperature is kept for 0.5h.

[0056] S2.4: After the annealing and heat preservation of the copper tube is completed, it needs to be quenched to room temperature immediately, and the quenching method is any one of water quenching, oil quenching and air quenching; in this embodiment, after the annealing and heat preservation of the copper tube is completed, it is immediately quenched to room temperature by water.

[0057] S3: Finished product processing; the thin copper tube containing dense magnesium powder in S2 is processed and cut into the required length and shape, and surface treated, and finally made into a solid pipe with an outer diameter of Φ8-20mm for hydrogen flow. In this embodiment, the solid copper parts at both ends of the thin copper tube with an outer diameter of Φ8.00mm after water quenching in S2.4 are cut off, and the remaining magnesium powder solid copper tube is cut into a 400mm long straight tube and processed into a cylindrical spiral shape. Finally, a surface passivation treatment is performed, that is, a dense oxide film is formed on the surface of the copper tube to enhance the oxidation resistance and corrosion resistance, and the required solid pipe for hydrogen flow is made.

[0058] Example 2

[0059] A solid pipe for hydrogen flow is made of copper tube and magnesium powder as raw materials, and is made by drawing, cleaning, annealing and quenching processes in sequence. Among them, the hydrogen content of magnesium powder is 2843ppm, the oxygen content is 283ppm, the particle size is d10=18.3μm, d90=143.8μm; the copper tube has a purity of 99.98%, an outer diameter of 60mm, an inner diameter of 50mm, a length of 800mm, and one end is sealed by laser welding with a 10mm thick copper plug.

[0060] A method for preparing a solid pipe for passing hydrogen comprises the following steps:

[0061] S1: Raw material preparation and filling packaging: magnesium powder and a copper tube sealed by laser welding with a 10mm thick copper plug at one end are selected as raw materials. According to the internal volume and drawing ratio of the copper tube, the required mass of magnesium powder is 1377.67g to ensure that the volume density of magnesium powder in the copper tube remains at 0.9g / cm 3 In a vacuum glove box, magnesium powder is accurately filled into the copper tube with the help of funnel technology, and it cannot be vibrated; after the filling is completed, the other end of the copper tube is sealed with a 10mm thick copper plug through laser welding technology.

[0062] S2: copper tube processing; the copper tube sealed at both ends in S1 is subjected to at least one cycle of drawing, cleaning and annealing, and then quenched to obtain a thin copper tube containing dense magnesium powder.

[0063] S2.1: First drawing: Spray lubricant (copper wire drawing oil produced by Jiangsu Yingji Lubrication Technology Co., Ltd.) on the surface of the copper tube sealed at both ends in S1, and draw it through die holes of Φ50.05mm and Φ40.04mm in turn to obtain a copper tube with an outer diameter of Φ40.01mm;

[0064] S2.2: First cleaning, using 20% ​​hydrochloric acid to clean the copper tube after drawing in S2.1, to obtain a copper tube with an outer diameter of Φ40.005 mm;

[0065] S2.3: For the first annealing, after the surface of the copper tube is cleaned, the temperature is uniformly increased to 400°C at a heating rate of 7°C / min in a vacuum environment, and after being kept at this temperature for 1 hour, the temperature is cooled to room temperature along with the furnace.

[0066] S2.4: secondary drawing, drawing the copper tube annealed in S2.3, so that it passes through die holes of Φ30.04 mm and Φ25.02 mm in sequence, to obtain a copper tube with an outer diameter of Φ25.01 mm;

[0067] S2.5: Secondary cleaning, using 20% ​​hydrochloric acid to clean the copper tube after drawing in S2.4, to obtain a copper tube with an outer diameter of Φ25.004 mm;

[0068] S2.6: Secondary annealing: After the surface of the copper tube is cleaned, the temperature is raised to 400°C at a rate of 5°C / min in a vacuum environment, and the temperature is kept at this temperature for 2 hours before being cooled to room temperature.

[0069] S2.7: Drawing three times, drawing the copper tube annealed in S2.6 again, so that it passes through die holes of Φ22.03 mm and Φ20.02 mm in sequence, to obtain a copper tube with an outer diameter of Φ20.008 mm;

[0070] S2.8: washing three times, using 10% hydrochloric acid to wash the copper tube after drawing in S2.7, to obtain a copper tube with an outer diameter of Φ20.001 mm;

[0071] S2.9: Final annealing: After the surface of the copper tube is cleaned, the temperature is raised uniformly at a rate of 10°C / min to an annealing temperature of 500°C in a vacuum environment and kept at this temperature for 1 hour;

[0072] S2.10: Quenching: After the annealing and heat preservation of the copper tube is completed, it is immediately quenched to room temperature.

[0073] S3: Finished product processing: Cut off the solid copper parts at both ends of the thin copper tube with an outer diameter of Φ20.001mm after water quenching in S2.10, and cut the remaining magnesium powder solid copper tube into 200mm long straight tubes. Finally, perform surface passivation treatment, that is, form a dense oxide film on the surface of the copper tube to enhance oxidation resistance and corrosion resistance, and make the required solid pipeline for hydrogen.

[0074] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A solid pipe for hydrogen flow, characterized in that: It includes a tube body and a filling body. The tube body is made of copper metal, and the filling body is sintered from magnesium powder.

2. A solid pipe for hydrogen flow according to claim 1, characterized in that: The hydrogen content in magnesium powder is 1000-3500ppm, and the oxygen content is less than 500ppm.

3. A solid pipe for hydrogen flow according to claim 2, characterized in that: The particle size of the magnesium powder is 0-150 μm.

4. A solid pipe for hydrogen flow according to claim 3, characterized in that: The purity of the copper tube is over 99.95%, with an outer diameter of 12-60mm, an inner diameter of 10-50mm, and a length of 300-1000mm.

5. The method for preparing a solid pipe for hydrogen flow according to claim 4, characterized in that: The following steps are involved: S1: Raw material preparation and filling packaging; magnesium powder and a copper tube with one end sealed are selected as raw materials. In a vacuum glove box, magnesium powder is filled into the copper tube, and then the other end of the filled copper tube is sealed; S2: copper tube processing; the copper tube sealed at both ends in S1 is subjected to at least one cycle of drawing, cleaning and annealing, and then quenched to obtain a thin copper tube containing dense magnesium powder; S3: Finished product processing: the thin copper tube containing dense magnesium powder in S2 is processed and cut into the required length and shape, and surface treated to finally make a solid pipe for hydrogen flow.

6. The method for preparing a solid pipe for hydrogen flow according to claim 5, characterized in that: In S1, the mass of magnesium powder required is calculated according to the internal volume of the copper tube and the drawing ratio, ensuring that the volume density of magnesium powder in the copper tube is maintained at 0.7-1.2g / cm 3 .

7. The method for preparing a solid pipe for hydrogen flow according to claim 6, characterized in that: In S2, the copper tube drawing process is: using multiple groups of die holes with different diameters, the copper tube is drawn in sequence, the deformation amount is controlled at 10-60% each time, and the die hole diameter is 0.1-0.5% larger than the design diameter.

8. The method for preparing a solid pipe for hydrogen flow according to claim 7, characterized in that: In S2, after the copper tube is drawn, its surface needs to be cleaned, and the cleaning liquid is an acid cleaning liquid.

9. The method for preparing a solid pipe for hydrogen flow according to claim 8, characterized in that: In S2, after the surface of the copper tube is cleaned, annealing treatment is then performed. The annealing process is: in a vacuum environment, the temperature is uniformly increased at a rate of 5-10°C / min to an annealing temperature of 400-500°C, and the temperature is kept for 0.5-2h.

10. The method for preparing a solid pipe for hydrogen flow according to claim 9, characterized in that: In S2, after the annealing and heat preservation of the copper tube is completed, it needs to be quenched to room temperature immediately, and the quenching method is any one of water quenching, oil quenching and air quenching.

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