Metal foil coated tube, method of manufacturing metal foil coated tube, and hydrogen separation device

Abstract

To provide a metal foil cover pipe having excellent airtightness and productivity, and to provide a manufacturing method of the metal foil cover pipe and a hydrogen separator including the metal foil cover pipe.SOLUTION: A metal foil cover pipe of the disclosure includes: a cylindrical support having multiple holes; a metal foil which covers an outer surface of the cylindrical support and in which both ends overlap with each other; a joint part formed by sandwiching an overlapping portion of both ends of the metal foil by a first joint member and a second joint member; and an end cap which is provided at one longitudinal end of the cylindrical support so as to cover parts of the metal foil and the joint part. The joint part is provided in at least a part of or an entire part of the cylindrical support as seen in a longitudinal direction. The first joint member is provided contacting with the cylindrical support and the second joint member is provided so as to overlap with a part of or an entire part of the first joint member through the overlapping portion of both ends of the metal foil.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a metal foil clad tube, a method for manufacturing a metal foil clad tube, and a hydrogen separation device. [Background technology]

[0002] 2. Description of the Related Art Global warming and other problems caused by an increase in carbon dioxide emissions due to the consumption of fossil fuels are becoming increasingly serious. Fuel cells, which are a form of clean energy, have been attracting attention in recent years as a solution to these problems.

[0003] The fuel for fuel cells is hydrogen, and various methods for separating hydrogen have been investigated, including the use of metal foils that selectively allow hydrogen gas to pass through. For example, Patent Document 1 discloses a cylindrical hydrogen separator comprising a cylindrical hydrogen separation membrane formed by butt-welding the end faces of Nb-Ni-Ti alloy plates into a cylindrical shape, and a porous body adhered to the inside of the cylindrical hydrogen separation membrane.

[0004] The cylindrical hydrogen separator disclosed in Patent Document 1 is manufactured by wrapping a cylindrical hydrogen separation membrane around a porous body and welding the butted or overlapping parts of the cylindrical hydrogen separation membrane. However, this requires advanced technology and there is a risk of reduced airtightness and reduced productivity due to poor welding, etc.

[0005] In response to the above problem, Patent Document 2 proposes a hydrogen separation membrane module including a cylindrical support having a plurality of holes and a hydrogen separation membrane layer arranged on the outer surface of the support and allowing hydrogen gas to selectively permeate from a mixed gas, wherein the hydrogen separation membrane layer is a sheet-like hydrogen separation membrane element formed into a ring structure having a first end portion and a second end portion positioned opposite each other, the ring structure including an annular portion surrounding the support and a joint portion where the first end portion and the second end portion are overlapped and fixed to each other, and the joint portion is overlapped on the annular portion so that one of the first end portion and the second end portion is folded back onto the annular portion. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-208607 [Patent Document 2] Japanese Patent Application Publication No. 2019-25416 Summary of the Invention [Problem to be solved by the invention]

[0007] The present inventors have now discovered that there is room for further improvement in the productivity of the hydrogen separation membrane module disclosed in Patent Document 2.

[0008] An object of the present disclosure is to provide a metal foil-coated tube having excellent airtightness and productivity, a method for manufacturing the metal foil-coated tube, and a hydrogen separation device including the metal foil-coated tube. [Means for solving the problem]

[0009] The specific means for achieving the objectives are as follows: <1> a cylindrical support having a plurality of holes; a metal foil covering the outer surface of the cylindrical support and having both ends overlapping each other; a joint formed by sandwiching the overlapping portions of both ends of the metal foil between a first joint member and a second joint member; an end cap provided at one end in the longitudinal direction of the cylindrical support; a hollow tube provided at the other end in the longitudinal direction of the cylindrical support; Equipped with The joint portion is provided over at least a portion of the cylindrical support body in the longitudinal direction or over the entire longitudinal direction, The first joining member is provided in contact with the cylindrical support body, and The second bonding member is provided so as to overlap a part or the whole of the first bonding member via a portion where both end portions of the metal foil overlap. Metal foil coated tube. <2> The cylindrical support has a recessed portion provided over at least a portion of the longitudinal direction or over the entire longitudinal direction, and The first bonding member is provided in the recessed portion. the above <1> The metal foil-coated tube according to claim 1. <3> The metal foil covers 70% or more of the area of ​​the outer surface of the cylindrical support. the above <1> or <2> The metal foil-coated tube according to claim 1. <4> The second bonding member is provided so as to overlap the first bonding member by 1 mm or more in the width direction via the overlapping portion of both end portions of the metal foil. the above <1> ~ <3> 10. The metal foil-coated tube according to claim 9, wherein the metal foil-coated tube is a metal foil-coated tube. <5> The metal foil contains at least one of palladium and a palladium alloy. the above <1> ~ <4> 10. The metal foil-coated tube according to claim 9, wherein the metal foil-coated tube is a metal foil-coated tube. <6> providing a cylindrical support having a plurality of holes, the cylindrical support having an end cap at one longitudinal end and a hollow tube at the other longitudinal end; a step of providing a first joining member in contact with at least a portion of the cylindrical support body in the longitudinal direction or the entirety of the cylindrical support body in the longitudinal direction; a step of wrapping a metal foil around the outer surface of the cylindrical support body so that both ends of the metal foil overlap each other; a step of placing a second bonding member so as to overlap a part or the whole of the first bonding member via a portion where both end portions of the metal foil overlap, and bonding the first bonding member and the second bonding member so as to sandwich the portion where both end portions of the metal foil overlap, thereby forming a bond; Equipped with Method for manufacturing metal foil coated tube. <7> The formation of the joint is performed by irradiating the first joint member and the second joint member with a laser. the above <6> 2. A method for producing a metal foil-coated tube according to claim 1 . <8> the above <1> ~ <5> a metal foil-clad tube according to any one of the above items; a housing vessel that accommodates the metal foil-coated tube and has a gas inlet and a gas outlet; and The end of the metal foil-coated tube where the hollow tube is provided is connected to or inserted into the hydrogen gas discharge part. Hydrogen separation device. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to provide a metal foil-coated tube having excellent airtightness and productivity, a method for manufacturing the metal foil-coated tube, and a hydrogen separation device including the metal foil-coated tube. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of one embodiment of a cylindrical support having an end cap on one end and a hollow tube on the other end. [Figure 2] FIG. 2 is a cross-sectional view of the cylindrical support taken along line AA of FIG. [Figure 3] FIG. 3 is a perspective view showing one embodiment of a metal foil-covered tube. [Figure 4] FIG. 4 is a cross-sectional view of the metal foil-covered tube of FIG. 3 taken along line BB. [Figure 5] FIG. 5 is a perspective view showing one embodiment of a metal foil coated tube. [Figure 6] FIG. 6 is a perspective view showing one embodiment of a hydrogen separation device. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments for carrying out the present disclosure will be described in detail. However, the present disclosure is not limited to the following embodiments. In the following embodiments, components (including element steps, etc.) are not essential unless otherwise specified. The same applies to numerical values ​​and their ranges, and do not limit the present disclosure.

[0013] In the present disclosure, numerical ranges indicated using "to" include the numerical values ​​before and after "to" as the minimum and maximum values, respectively.

[0014] In the numerical ranges described in stages in the present disclosure, the upper or lower limit value described in one numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Furthermore, in the numerical ranges described in the present disclosure, the upper or lower limit value of the numerical range may be replaced with the value shown in the synthesis examples.

[0015] In the present disclosure, the term "process" includes not only a process that is independent of other processes, but also a process that cannot be clearly distinguished from other processes as long as the purpose of the process is achieved.

[0016] In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment.

[0017] The elements in the drawings shown in this disclosure are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present disclosure.

[0018] (metal foil coated tube) The metal foil clad tube of the present disclosure comprises: a cylindrical support having a plurality of holes; a metal foil covering the outer surface of the cylindrical support and having both ends overlapping each other; a joint formed by sandwiching the overlapping portions of both ends of the metal foil between a first joint member and a second joint member; an end cap provided at one end in the longitudinal direction of the cylindrical support; a hollow tube provided at the other end in the longitudinal direction of the cylindrical support, The joint portion is provided over at least a portion of the longitudinal direction of the cylindrical support body or over the entire longitudinal direction, the first joint member is provided in contact with the cylindrical support body, and the second joint member is provided so as to overlap a portion or the entirety of the first joint member via the portion where both ends of the metal foil overlap.

[0019] As a result of extensive research by the present inventors, it has been found that by adopting the above-mentioned configuration, it is possible to provide a metal foil-covered tube having excellent airtightness and productivity. The mechanism of action of this excellent effect is not clear, but is presumed as follows. The metal foil provided in the metal foil covered tube having the above-described configuration has both ends overlapping each other and the overlapping portions are sandwiched by the joints, and therefore it is presumed that the metal foil has excellent airtightness. In addition, the metal foil-covered tube having the above-mentioned configuration is formed by wrapping the metal foil around the cylindrical support body so that both ends of the metal foil overlap each other, and forming a joint portion so as to sandwich the overlapping portion. Therefore, it is possible to manufacture metal foil-coated tubes by simply using the above-mentioned method, and high technology is not required for manufacturing the metal foil-coated tubes. Therefore, it is assumed that the method has excellent productivity.

[0020] <Cylindrical support> The metal foil clad tube of the present disclosure comprises a tubular support having a plurality of holes.

[0021] The material constituting the cylindrical support is not particularly limited, and examples thereof include metals, metal oxides, and glass. Examples of metals include iron, chromium, aluminum, magnesium, copper, nickel, manganese, and alloys thereof. Examples of the metal oxide include oxides of the metals described above. Among the above, from the viewpoint of heat resistance, mechanical strength, etc., an alloy of iron and chromium is preferred, and an alloy containing 50 mass% or more of iron and 10.5 mass% or more of chromium (so-called stainless steel) is more preferred.

[0022] The cylindrical support may be a sintered body produced by sintering the above-mentioned materials.

[0023] From the viewpoint of mechanical strength and hydrogen gas permeability, the porosity of the cylindrical support is preferably 20% to 60%, and more preferably 30% to 50%. The porosity of the cylindrical support is measured in accordance with JIS R 1634:1998.

[0024] The shape of the cylindrical support is not particularly limited as long as it has a cylindrical shape. Examples of the shape of the cylindrical support include a cylindrical shape, an elliptical shape, a polygonal shape, etc. From the viewpoint of mechanical strength, a cylindrical shape is preferable.

[0025] The cylindrical support preferably has a recessed portion provided in at least a portion of the longitudinal direction or in the entire longitudinal direction, whereby a first joining member constituting a joining portion, which will be described later, can be provided in the recessed portion. By providing the first joining member in the recessed portion, the joining portion consisting of the first joining member and the second joining member and the metal foil sandwiched between the joining portions can be prevented from moving on the outer surface of the cylindrical support body, thereby further improving airtightness. Furthermore, by providing a recessed portion in the first joining member, a planar shape can be formed on the first joining member, thereby improving the weldability between the first joining member and the cylindrical support body using a laser or the like, and further improving airtightness. 1 and 2 show an embodiment of a cylindrical support 1 having a recess 2. In FIG. Fig. 1 is a perspective view showing one embodiment of the cylindrical support body 1. Fig. 2 is a cross-sectional view taken along line AA of the cylindrical support body 1 shown in Fig. 1. Although Fig. 1 and Fig. 2 show a cylindrical cylindrical support body 1, the present invention is not limited to this. In FIG. 1, reference numeral 3 denotes an end cap, reference numeral 4 denotes a hollow tube, and reference numeral 5 denotes an opening of the hollow tube.

[0026] The thickness of the cylindrical support 11 is not particularly limited as long as it can support the metal foil and provide sufficient mechanical strength to the metal foil-covered tube, but may be, for example, 0.1 mm to 10 mm. In Figure 4, the thickness of the cylindrical support 11 is indicated by d1.

[0027] The length of the cylindrical support is not particularly limited, and can be, for example, 100 mm to 1000 mm.

[0028] <Metal foil> The metal foil-coated tube of the present disclosure includes a metal foil covering the outer surface of a cylindrical support body and overlapping both ends. The metal foil-coated tube of the present disclosure can be manufactured by wrapping metal foil around a cylindrical support, and it is presumed that this can compensate for the mechanical strength of the metal foil. The metal foil may cover the entire outer surface of the cylindrical support, or may cover only a part of it. From the viewpoint of airtightness of the metal foil-coated tube, the metal foil preferably covers 70% or more, and more preferably 80% or more of the area of ​​the outer surface of the cylindrical support.

[0029] From the viewpoint of selective hydrogen gas permeability, heat resistance, etc., the metal foil preferably contains at least one of palladium and a palladium alloy. Palladium alloys include alloys of palladium with one or more metals selected from the group consisting of silver, copper, gold, platinum, rhodium, ruthenium, iridium, osmium, indium, gallium, tin, and zinc. Among the above, an alloy of palladium and silver is preferred from the viewpoint of selective hydrogen permeability.

[0030] The sum of the contents of palladium and palladium alloy relative to the total mass of the metal foil is preferably 50 mass% or more, more preferably 60 mass% or more, even more preferably 70 mass% or more, and particularly preferably 80 mass% or more.

[0031] From the viewpoint of selective hydrogen gas permeability, durability, etc., the atomic ratio of palladium in the palladium alloy is preferably 10 at % to 50 at %.

[0032] From the viewpoints of selective hydrogen gas permeability, heat resistance, durability, etc., the thickness of the metal foil is preferably 0.01 mm to 0.1 mm, and more preferably 0.02 mm to 0.08 mm.

[0033] The metal foil has both ends overlapping each other, and the overlapping portions are sandwiched by a joint portion, which will be described later. From the viewpoint of airtightness of the metal foil covered tube, the width of the overlapping portion is preferably 1 mm to 10 mm, and more preferably 3 mm to 6 mm.

[0034] <Joint part> The metal foil-coated tube of the present disclosure includes a joint having a first joint member and a second joint member, which sandwich the overlapping portion of both ends of the metal foil, thereby improving the airtightness of the metal foil-coated tube.

[0035] The joint is provided over at least a portion of the cylindrical support body in the longitudinal direction or over the entirety of the cylindrical support body in the longitudinal direction. The joint is preferably provided over the entire longitudinal length of the cylindrical support, and more preferably extends over part or the entire longitudinal length of the end caps and hollow tube provided at both ends of the cylindrical support.

[0036] <First joining member> The first joining member is provided in contact with the cylindrical support body. When the cylindrical support has a recess, the first joining member is preferably provided in the recess, which may extend partially or entirely along the longitudinal direction of the end cap and the hollow tube. In addition, when the cylindrical support body does not have a recessed portion, the first joining member may be provided on the outer surface of the cylindrical support body. From the viewpoint of airtightness, it is preferable that the first joining member and the cylindrical support body are joined together.

[0037] The material constituting the first joining member is not particularly limited, and the same material as that constituting the cylindrical support body can be used. From the viewpoint of airtightness and strength of the joint, it is preferable that the material constituting the first joint member is the same as the material constituting the cylindrical support body. Among the above-mentioned materials, the material constituting the first joining member is preferably a metal such as iron, chromium, aluminum, magnesium, copper, nickel, manganese, or an alloy thereof. By forming the first joining member from the above-mentioned metal, it becomes possible to join the first joining member to the cylindrical support body by laser welding, and the productivity of the metal foil coated tube can be improved.

[0038] From the viewpoint of airtightness and strength of the joint, the thickness of the first joint member is preferably 0.1 mm to 1 mm, and more preferably 0.3 mm to 0.7 mm. In Fig. 4, the thickness of the first joint member 16 is indicated by d2.

[0039] From the viewpoint of productivity, the width of the first joint members is preferably 2 mm to 10 mm, and more preferably 3 mm to 8 mm. In Fig. 4, the width of the first joint members 16 is indicated by w.

[0040] The length of the first joint member is not particularly limited and can be, for example, 100 mm to 1000 mm. In Fig. 3, the length of the first joint member 16 is indicated by 1.

[0041] <Second joining member> The second bonding member is provided so as to overlap a part or the whole of the first bonding member via the overlapping portion of both ends of the metal foil. From the viewpoint of airtightness of the metal foil covered tube, the second joint member is preferably provided so as to overlap the entire first joint member via the portion where both ends of the metal foil overlap.

[0042] The second bonding member is preferably arranged so as to overlap the first bonding member by 1 mm or more in the width direction via the overlapping portion of both ends of the metal foil, more preferably by 3 mm or more, and even more preferably by 5 mm or more. By overlapping the second joining member with the first joining member by 1 mm or more in the width direction, it becomes easier to join the first joining member and the second joining member using a laser or the like, and productivity can be further improved. In addition, by overlapping the second joining member with the first joining member by 1 mm or more in the width direction, the airtightness of the metal foil coated tube and the strength of the joint can be improved.

[0043] The material constituting the second joining member, and the preferred aspects of the thickness, width and length of the second joining member are the same as those of the first joining member, and therefore description thereof will be omitted here.

[0044] <End cap> The metal foil-coated tube of the present disclosure includes an end cap at one longitudinal end, which allows the one end of the metal foil-coated tube to be sealed, thereby improving airtightness and strength.

[0045] The material constituting the end cap is not particularly limited, and the same material as that constituting the cylindrical support body can be used. From the viewpoint of heat resistance, bonding strength, etc., it is preferable that the material constituting the end caps is the same as the material constituting the cylindrical support body.

[0046] <Hollow tube> The metal foil-clad tube of the present disclosure includes a hollow tube at the other longitudinal end thereof, and hydrogen gas is extracted from an opening in the hollow tube of the metal foil-clad tube.

[0047] The material for forming the hollow tube is not particularly limited, and the same material as that for forming the cylindrical support can be used. From the viewpoint of heat resistance, bonding strength, etc., it is preferable that the material constituting the hollow tube is the same as the material constituting the cylindrical support.

[0048] <Sealing part> The metal foil-coated tube of the present disclosure may be provided with a sealing portion for sealing the boundary between the cylindrical support and the end cap and hollow tube, thereby further improving airtightness and joint strength.

[0049] The material constituting the sealing portion is not particularly limited, and the same material as that constituting the cylindrical support can be used. From the viewpoint of heat resistance, bonding strength, etc., it is preferable that the material constituting the sealing portion is the same as the material constituting the cylindrical support body.

[0050] Next, an embodiment of the metal foil coated tube of the present disclosure will be described with reference to Figures 3 to 5. Figures 3 and 5 are perspective views showing an embodiment of the metal foil coated tube of the present disclosure. Figure 4 is a cross-sectional view of the metal foil coated tube shown in Figure 3 taken along line BB.

[0051] As shown in FIGS. 3 and 4, the metal foil clad tube 10 includes a cylindrical support 11, a metal foil 12, a joint 13, an end cap 14, and a hollow tube 15.

[0052] The metal foil clad tube 10 shown in FIGS. 3 and 4 includes a cylindrical support 11, an end cap 14, and a hollow tube 15, each of which has a recessed portion.

[0053] As shown in FIG. 4, the metal foil 12 has portions where both ends overlap each other.

[0054] As shown in FIGS. 3 and 4, the device includes a joint 13 having a first joint member 16 and a second joint member 17. The first joint member 16 is provided in the cylindrical support 11, the end cap 14, and the recessed portion of the hollow tube 15 so as to be in contact with the cylindrical support 11. The second bonding member 17 is provided so as to overlap the entire first bonding member 16 via the portion where both end portions of the metal foil 12 overlap.

[0055] As shown in FIG. 5, the metal foil clad tube 20 includes a cylindrical support, a metal foil 22, a joint 23, an end cap 24, a hollow tube 25, and a sealing portion 28. In FIG. 5, the first and second joining members are indicated by the reference numerals 26 and 27, respectively.

[0056] (Metal foil coated tube manufacturing method) The method for manufacturing a metal foil coated tube of the present disclosure includes the steps of: preparing a cylindrical support body having a plurality of holes, with an end cap at one longitudinal end and a hollow tube at the other end; providing a first joining member in contact with at least a portion of the longitudinal direction or the entire longitudinal direction of the cylindrical support body; wrapping metal foil around the outer surface of the cylindrical support body so that both ends overlap; and arranging a second joining member so that it overlaps part or all of the first joining member via the overlapping portion of the metal foil, and joining the first joining member and the second joining member so as to sandwich the overlapping portion of the metal foil to form a joint.

[0057] <Step of preparing a cylindrical support> The method of manufacturing a metal foil-coated tube of the present disclosure includes providing a cylindrical support having a plurality of holes, an end cap at one longitudinal end, and a hollow tube at the other longitudinal end. The cylindrical support may be a commercially available product or may be manufactured.

[0058] The step of preparing the cylindrical support may include the step of providing an end cap at one longitudinal end of the cylindrical support.

[0059] In one embodiment, the end cap can be provided by placing and joining an end cap to one end of the cylindrical support. The joining method is not particularly limited, and can be performed by the same method as that for forming the joining portion described below.

[0060] The cylindrical support may be one prepared by sintering the above-mentioned materials by a conventionally known method, or a commercially available one may be used.

[0061] The step of preparing a cylindrical support may include the step of providing a hollow tube at the other longitudinal end of the cylindrical support.

[0062] In one embodiment, the hollow tube can be provided by placing and joining a hollow tube to the other end of the cylindrical support. The joining method is not particularly limited, and can be performed by the same method as that for forming the joining portion described below.

[0063] <Step of Providing First Joining Member> The method for manufacturing a metal foil-coated tube of the present disclosure includes a step of providing a first joint member in contact with at least a portion of the cylindrical support body in the longitudinal direction or over the entirety of the cylindrical support body in the longitudinal direction. The cylindrical support body and the first joining member are preferably joined together, and the joining method can be the same as the method for forming the joining portion described below.

[0064] A recess may be formed in the cylindrical support body, and the first joining member may be provided in this recess. The recess may also be formed to extend partially or entirely through the end cap and hollow tube. The recessed portion can be formed by cutting, or may be formed after the end cap and the hollow tube are provided at the end of the cylindrical support.

[0065] <Winding process> The method for manufacturing a metal foil-coated tube of the present disclosure includes a step of wrapping metal foil around the outer surface of a cylindrical support having a plurality of holes so that both ends of the metal foil overlap. The metal foil is preferably wrapped around the cylindrical support body so that the overlapping portion of both ends of the metal foil is positioned on the first bonding member. The metal foil may be prepared by a conventionally known method or may be commercially available.

[0066] <Joint formation process> The method for manufacturing a metal foil coated tube of the present disclosure includes a step of positioning a second joining member so that it overlaps part or all of the first joining member through the overlapping portion of the both ends of the metal foil, and joining the first joining member and the second joining member so that they sandwich the overlapping portion of the both ends of the metal foil, thereby forming a joint.

[0067] The method for joining the first and second joining members is not particularly limited, and can be performed, for example, by irradiating a laser onto the first and second joining members that are arranged so as to sandwich the overlapping portions of the metal foil. It is preferable that the overlapping portions of the metal foil are also welded by this laser welding. The method is not limited to the above, and the first and second joining members may be joined using a conventionally known adhesive or the like.

[0068] When a laser is used to form a joint, the laser irradiation conditions are not particularly limited. For example, the maximum average power can be 100 W to 500 W, the maximum peak power can be 1 kW to 10 kW, the maximum pulse energy can be 10 J to 100 J, and the pulse width can be 0.2 Hz to 500 Hz. As the laser irradiation device, for example, JK-702 manufactured by Sumitomo Heavy Industries, Ltd. or a device of the same level can be used.

[0069] <Sealing portion forming process> The method for manufacturing a metal foil-coated tube according to the present disclosure may include a step of forming a tubular sealing portion at the boundary between the cylindrical support and the end cap and hollow tube, and joining the tubular sealing portion to the cylindrical support, the end cap, and the hollow tube. The joining method can be the same as that for forming the joint.

[0070] (Hydrogen separation device) The hydrogen separation device of the present disclosure comprises the metal foil-coated tube and a housing container that houses the metal foil-coated tube and has a gas inlet and a gas outlet, and the end of the metal foil-coated tube that is not provided with an end cap is connected to or inserted into the hydrogen gas outlet.

[0071] <Metal foil coated tube> The metal foil cladding tube has been described above, and therefore will not be described here.

[0072] <Housing container> As shown in FIG. 6, a hydrogen separation apparatus 100 of the present disclosure includes a housing vessel 103 that includes a gas inlet 101 and a gas outlet 102 . In addition, Figure 6 shows an embodiment in which the end of the metal foil coated tube 104 where the hollow tube 105 is provided is inserted into the gas exhaust section 102 of the housing container 103, but this is not limited to this, and the above-mentioned end of the metal foil coated tube may also be connected to the gas exhaust section. In FIG. 6, reference numeral 106 denotes a metal foil, and reference numeral 108 denotes an end cap.

[0073] A mixed gas containing hydrogen gas, ammonia gas, or the like is introduced into the housing vessel through a gas inlet. The hydrogen gas contained in the introduced mixed gas permeates the metal foil provided in the metal foil-coated tube and is discharged from the gas discharge portion of the housing vessel to which the end of the metal foil-coated tube where the hollow tube is provided is connected or inserted. When ammonia gas is introduced into the housing, the ammonia gas is decomposed by the ammonia decomposition catalyst packed in the housing to generate hydrogen gas. The generated hydrogen gas permeates the metal foil of the metal foil-coated tube and is discharged from the gas outlet of the housing to which the end of the metal foil-coated tube, where the hollow tube is provided, is connected or inserted.

[0074] Hydrogen gas can be allowed to permeate the metal foil by performing a decompression treatment so that the pressure inside the cylindrical support provided in the metal foil coated tube becomes lower than the pressure inside the housing vessel, or by performing a pressurization treatment so that the pressure inside the housing vessel becomes higher than the pressure inside the cylindrical support.

[0075] As the ammonia decomposition catalyst, a conventionally known catalyst can be used, and examples thereof include catalysts containing iron, cobalt, nickel, molybdenum, lanthanum, cerium, neodymium, ruthenium, rhodium, iridium, palladium, platinum, alloys thereof, nitrides thereof, carbides thereof, oxides thereof, and the like.

[0076] The material constituting the housing is not particularly limited, and the same material as that constituting the cylindrical support can be used.

[0077] As shown in Fig. 6, a tube 107 or the like connected to a pump may be connected to the end of a metal foil-coated tube 104, at which a hollow tube 105 is provided, which is inserted into a gas discharge part 102 of a housing vessel 103. In Fig. 6, the pump is indicated by the symbol P. [Example]

[0078] The above embodiment will be specifically described below using examples, but the above embodiment is not limited to these examples.

[0079] Example 1 A cylindrical stainless steel cylindrical support was prepared. The cylindrical support had a length of 600 mm, an outer diameter of 30 mm, and an inner diameter of 25 mm. The cylindrical support was a sintered stainless steel body with a porosity of 37% to 38%.

[0080] A stainless steel end cap was placed on one end of the cylindrical support, and laser irradiation was performed using JK-702 manufactured by Sumitomo Heavy Industries, Ltd. to weld the cylindrical support and the end cap together. The end cap had a length of 30 mm and a diameter of 30 mm.

[0081] A stainless steel hollow tube was placed at the other end of the cylindrical support, and the cylindrical support and the end cap were welded together by irradiating them with a laser from the device. The hollow tube had a length of 30 mm, an outer diameter of 30 mm, and an inner diameter of 25 mm.

[0082] The cylindrical support, end caps, and hollow tubes were cut to form recesses. Specifically, recesses were formed along the entire length of the cylindrical support and extending over a portion of the length of the end caps and hollow tubes (9 mm each). A first joining member measuring 618 mm in length, 5 mm in width, and 0.5 mm in thickness was embedded in this recess, and a laser was irradiated onto the first joining member using the above-mentioned device to weld the cylindrical support, end caps, and hollow tubes to the first joining member. The first joining member was made of stainless steel, just like the cylindrical support.

[0083] A metal foil made of a palladium alloy (silver-palladium alloy) was prepared. The metal foil had a length of 618 mm, a width of 100 mm, and a thickness of 25 μm. The metal foil was wrapped around the cylindrical support so that both ends of the metal foil overlapped each other and the overlapping portion was positioned on the first joining member.

[0084] A second bonding member was placed on the overlapping portion of the metal foil, and a laser was applied using the above-mentioned device to weld the first bonding member and the second bonding member together to form a bonded portion. The overlapping portion of the metal foil was also welded by the above-mentioned laser irradiation. The second joining member was the same size as the first joining member, was made of stainless steel, and was positioned so that it overlapped the entire first joining member via the overlapping portions of both ends of the metal foil.

[0085] After forming the joint, a stainless steel sealing portion was placed at the boundary between the cylindrical support and the end cap and hollow tube, and a laser was irradiated using the above-mentioned device to form the sealing portion, thereby obtaining a metal foil-coated tube according to the present disclosure.

[0086] <Airtightness evaluation> A helium leak detector was connected to the end of the metal foil-clad tube manufactured in the above example where no end cap was provided, and helium gas was sprayed from the outside of the metal foil-clad tube. Next, the amount of helium gas leaked into the metal foil cladding tube was measured using a HELIOT 307 manufactured by ULVAC, and the leak amount was 1×10 -8 Pa·m 3 / s.

[0087] The metal foil coated tube manufactured in the above examples has excellent productivity because it does not require welding of the metal foil to the cylindrical support body at the butted or overlapping parts of the metal foil, and does not require high technology for its manufacture. Furthermore, in the evaluation of airtightness, it was found that the amount of leaked helium gas was extremely small, demonstrating excellent airtightness. [Explanation of symbols]

[0088] 1: cylindrical support, 2: recessed portion, 3: end cap, 4: hollow tube, 5: opening, 10: metal foil coated tube, 11: cylindrical support, 12: metal foil, 13: joint portion, 14: end cap, 15: hollow tube, 16: first joint member, 17: second joint member, 20: metal foil coated tube, 22: metal foil, 23: joint portion, 24: end cap, 25: hollow tube, 26: first joint member, 27: second joint member, 28: sealing portion, 100: hydrogen separation device, 101: gas inlet portion, 102: gas outlet portion, 103: housing vessel, 104: metal foil coated tube, 105: hollow tube, 106: metal foil, 107: tube, 108: end cap

Claims

1. A metal foil-clad tube for use in a hydrogen separation device, comprising: a cylindrical support having a plurality of holes; a metal foil covering the outer surface of the cylindrical support and having both ends overlapping each other; a joint formed by sandwiching an overlapping portion of both end portions of the metal foil between a first joint member and a second joint member; an end cap provided at one end in the longitudinal direction of the cylindrical support; a hollow tube provided at the other end of the cylindrical support in the longitudinal direction; Equipped with The joint portion is provided over at least a portion of the cylindrical support body in the longitudinal direction or over the entire longitudinal direction, The first joining member is provided in contact with the cylindrical support body, and The second bonding member is provided so as to overlap a part or the whole of the first bonding member via a portion where both end portions of the metal foil overlap. Metal foil coated tube.

2. The cylindrical support has a recessed portion provided along at least a portion of the longitudinal direction or along the entire longitudinal direction, and The first bonding member is provided in the recessed portion. The metal foil-coated tube according to claim 1 .

3. The metal foil covers 70% or more of the area of ​​the outer surface of the cylindrical support. The metal foil-coated tube according to claim 1 or 2.

4. The second bonding member is provided so as to overlap the first bonding member by 1 mm or more in the width direction via the overlapping portion of both end portions of the metal foil. The metal foil-coated tube according to any one of claims 1 to 3.

5. The metal foil contains at least one of palladium and a palladium alloy. The metal foil-coated tube according to any one of claims 1 to 4.

6. A method for manufacturing a metal foil-coated tube for use in a hydrogen separation device, comprising: providing a cylindrical support having a plurality of holes, the cylindrical support having an end cap at one longitudinal end and a hollow tube at the other longitudinal end; providing a first joining member in contact with at least a portion of the cylindrical support body in the longitudinal direction or the entirety of the cylindrical support body in the longitudinal direction; a step of wrapping a metal foil around the outer surface of the cylindrical support body so that both ends of the metal foil overlap each other; a step of placing a second bonding member so as to overlap a part or the whole of the first bonding member via a portion where both end portions of the metal foil overlap, and bonding the first bonding member and the second bonding member so as to sandwich the portion where both end portions of the metal foil overlap, thereby forming a bond; Equipped with Method for manufacturing metal foil coated tube.

7. The formation of the joint is performed by irradiating the first joint member and the second joint member with a laser. The method for producing a metal foil-coated tube according to claim 6.

8. The metal foil-coated tube according to any one of claims 1 to 5, a housing container that houses the metal foil-coated tube and has a gas inlet and a gas outlet; and The end of the metal foil-coated tube where the hollow tube is provided is connected to or inserted into the gas discharge part. Hydrogen separation device.

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