Assembly for the transport of liquid dihydrogen

Abstract

The invention relates to a transport assembly for a cryogenic liquid, preferably liquid dihydrogen, the assembly comprising a first transport section (2) and a second transport section (3). The first transport section (2) comprises a double-walled conduit, referred to as the first conduit (5), having an outer wall (6) and an inner wall (7). The second transport section comprises a double-walled conduit, referred to as the second conduit (3), having an outer wall (11) and an inner wall (12). The transport assembly (1) includes a removable connection system (4) for connecting the first transport section (2) to the second transport section (3). Abstract figure: Figure 1

Description

Title of the invention: Assembly for the transport of liquid dihydrogen. Technical field

[0001] The present invention relates to an assembly for the transport of a cryogenic liquid, preferably liquid dihydrogen. Previous technique

[0002] In an effort to reduce the climate impact of aviation, the Holder has developed aircraft projects whose engines operate with hydrogen propulsion. This type of propulsion requires specific equipment, including a storage and transport installation comprising one or more tanks containing hydrogen, preferably in liquid form and at cryogenic temperature, in order to increase its density and reduce the volume required for its storage.

[0003] The transport of cryogenic dihydrogen requires the use of vacuum-insulated transfer lines to reduce dihydrogen losses, particularly through vaporization. Two consecutive lines are generally welded together. Such welds provide leak-proof and robust connections, but have the disadvantage of being difficult to perform; and it is also complicated to unweld two lines once they have been welded, which makes the installation very inflexible for changes in configuration and complicates its maintenance.

[0004] The object of the invention is to remedy at least partially these drawbacks. Summary

[0005] To this end, a transport assembly for a cryogenic liquid, preferably liquid dihydrogen, is proposed, the assembly comprising a first transport part, and a second transport part, the first transport part comprising a double-walled conduit, referred to as the first conduit, having an outer wall and an inner wall, arranged at a distance from each other, the first transport part being shaped to maintain a pressure difference between the inner wall and the outer wall, the second transport part comprising a double-walled conduit, referred to as the second conduit, having an outer wall and an inner wall, arranged at a distance from each other, the second transport part being shaped to maintain a pressure difference between the inner wall and the outer wall, the transport assembly comprising a removable connection system from the first transport part to the second transport part.

[0006] Thus, thanks to the assembly according to the present invention, it is possible to assemble and disassemble the coupling of the two conduits and, therefore, to easily join and unjoin the conduits when necessary, for example for maintenance or when the arrangement of the conduits needs to be changed, while ensuring a robust and reliable connection.

[0007] According to another aspect, the removable connection system comprises an intermediate element delimiting an internal space, one end of the internal wall of the first conduit extending into said internal space and one end of the internal wall of the second conduit extending into said internal space, the removable connection system comprising means for removable fastening of the first transport part to the intermediate element and means for removable fastening of the second transport part to the intermediate element.

[0008] According to another aspect, the intermediate element comprises a coaxial sleeve of the inner wall of the first conduit and of the inner wall of the second conduit.

[0009] According to another aspect, an internal diameter of the sleeve has a diameter greater than at least one of the diameters of the external wall of the first conduit and of the diameter of the external wall of the second conduit.

[0010] According to another aspect, the means for removable fastening of the first transport part to the intermediate element include an interface for fixing the sleeve to the external wall of the first conduit.

[0011] According to another aspect, the means for removable attachment of the second transport part to the intermediate element include an interface for fixing the sleeve to the external wall of the second conduit.

[0012] According to another aspect, the removable connection system includes removable fixing means from the end of the inner wall of the first conduit to the end of the inner wall of the second conduit.

[0013] According to another aspect, the intermediate element comprises a first receiving flange for the outer wall of the first transport part, and a second receiving flange for the outer wall of the second transport part.

[0014] According to another aspect, the intermediate element comprises at least one stiffening rod extending between the first receiving flange of the outer wall and the second receiving flange of the outer wall.

[0015] According to another aspect, the assembly includes a expansion compensator between the inner wall of the first transport part and the inner wall of the second transport part.

[0016] According to another aspect, the assembly includes a expansion compensator between the outer wall of the first transport part and the outer wall of the second transport part.

[0017] According to another aspect, the assembly comprises a multilayer insulation around the internal walls respectively of the first duct and the second duct.

[0018] According to another aspect, the assembly includes a vacuum barrier between the outer wall and the inner wall of the first transport part, so that the pressure difference between the outer wall and the inner wall of the first transport part remains unchanged in the event of disconnection of the second transport part.

[0019] According to another aspect, the assembly includes a vacuum barrier between the outer wall and the inner wall of the second transport part, so that the pressure difference between the outer wall and the inner wall of the second transport part remains unchanged in the event of disconnection of the first transport part.

[0020] The invention also relates to a method of disconnecting the first transport part or the second transport part from the transport assembly as described above, comprising a removable disengagement step of the intermediate element and the first transport part, and a removable disengagement step of the intermediate element and the second transport part.

[0021] According to another aspect, the process includes a step of filling the internal space of the intermediate element with a gaseous fluid.

[0022] According to another aspect, the method includes a step of translating the intermediate element along the outer wall of the first conduit or the outer wall of the second conduit.

[0023] The invention also relates to a liquid dihydrogen storage and transport installation, comprising an assembly as described above and a liquid dihydrogen storage tank. Brief description of the drawings

[0024] Other features, details and advantages will become apparent from reading the detailed description below and from analyzing the accompanying drawings, in which: Fig. 1

[0025] [Fig. 1] is a schematic view of a longitudinal section of a liquid dihydrogen transport assembly, according to the present invention, in a connected position. Fig. 2

[0026] [Fig.2] is a schematic perspective view of the whole of [Fig.1], in connected position. Fig. 3

[0027] [Fig.3] is another schematic perspective view of the whole of [Fig.2], in connected position. Fig. 4

[0028] [Fig.4] is another schematic perspective view of the whole of [Fig.2], in disconnected position. Description of the implementation methods

[0029] The examples and associated conditions detailed herein are primarily intended to help the reader understand the principles of the present invention and not to limit its scope to these specific examples and conditions. It will be understood that a person skilled in the art can conceive of various arrangements which, although not explicitly described or illustrated herein, nevertheless embody the principles of the present invention and are included in its spirit and scope.

[0030] Furthermore, to facilitate understanding, the following description may describe relatively simplified implementations of the present invention. As a person skilled in the art will understand, other implementations of the present invention may be of greater complexity.

[0031] In some cases, examples of modifications to the present invention may also be shown. This is done simply to aid understanding and, again, not to define the scope or establish the limits of the present invention. These modifications are not an exhaustive list, and a person skilled in the art may make other modifications while remaining within the scope of the present invention.

[0032] Furthermore, all the following statements relating to the principles, aspects and implementations of the present invention, as well as specific examples thereof, are intended to encompass both the structural and functional equivalents thereof, whether currently known or developed in the future.

[0033] As can be seen from the figures, the invention relates to a transport assembly for liquid dihydrogen at a cryogenic temperature. The assembly is referred to as 1 in the figures. The invention also relates to an installation 100 for storing and transporting the liquid at a cryogenic temperature, comprising the transport assembly 1.

[0034] The invention is of course not limited to this liquid, and can be applied to any type of liquid fluid. The transport assembly is referenced as 1 in the figures.

[0035] Cryogenic temperature generally refers to a temperature below the liquefaction temperature of air (approximately -150°C) or methane (approximately -160°C). Since the vaporization temperature of dihydrogen is -253°C at atmospheric pressure, this is indeed a cryogenic temperature.

[0036] As can be seen in the figures, the assembly 1 comprises a first transport part 2 and a second transport part 3, connected to each other by a removable connection system 4 from the first transport part 2 to the second transport part 3.

[0037] In the illustrated embodiment, and without limitation, the first transport section 2 is a liquid hydrogen transfer line and the second transport section 3 is a liquid hydrogen pump (or "pump skid") for circulating the liquid hydrogen in the installation 100. Of course, the invention is not limited to this arrangement, and the second transport section 3 can be a liquid hydrogen transfer line. More broadly, the first section 2 and the second section 3 are two consecutive elements for transporting the hydrogen.

[0038] As particularly visible in [Fig.1], the first transport part 2 comprises a double-walled conduit 5, referred to as the first conduit 5, having an outer wall 6 and an inner wall 7. The outer wall 6 and inner wall 7 are collinear along an axis A, the inner wall 7 extending into an internal space delimited by the outer wall 6.

[0039] The external wall 6 and internal wall 7 are kept apart from each other, for example by spacers (not shown) arranged regularly or irregularly along the axis A between the external wall 6 and the internal wall 7.

[0040] The first transport part 2 is shaped to apply a pressure difference between the inner wall 7 and the outer wall 6, as will be detailed later.

[0041] As particularly visible in [Fig.1], the second transport part 3 comprises a double-walled conduit 10, referred to as the second conduit 10, having an outer wall 11 and an inner wall 12. The outer wall 11 and inner wall 12 are collinear along an axis AA, the inner wall 12 extending into an internal space delimited by the outer wall 11.

[0042] The outer wall 11 and inner wall 12 are kept apart from each other, for example by spacers (not shown) arranged regularly or irregularly along the axis AA between the outer wall 11 and the inner wall 12.

[0043] The second transport part 3 is shaped to apply a pressure difference between the inner wall 12 and the outer wall 11, as will be detailed later.

[0044] The second transport section 3 advantageously includes a pumping port P.

[0045] Advantageously, the inner wall 7 and / or the inner wall 12 may be provided of a thermal expansion compensator 14. In [Fig.1], the inner wall 12 is fitted with a compensator 14. The compensator 14 ensures the management of temperature variations, and thus maintains the integrity of the second conduit 10 and its connection to the first conduit 5. The compensator 14 is, for example, a bellows having a corrugated, accordion-type structure visible in [Fig.4].

[0046] In [Fig. 1], the first conduit 5 is generally cylindrical in shape. D6 denotes the diameter of the outer wall 6 and D7 the diameter of the inner wall 7, D6 being strictly greater than D7. In [Fig. 1], the diameters D6 and D7 are constant.

[0047] In [Fig. 1], the second conduit 10 is generally cylindrical in shape. DI 1 denotes the diameter of the outer wall 11 and D12 the diameter of the inner wall D12. In [Fig. 1], the diameter DI 1 is constant while the diameter D12 varies, the inner wall 12 comprising a frustoconical portion to join the two conduits.

[0048] It is noted that, in the illustrated embodiment, the diameter DI 1 of the external wall 11 of the second conduit 10 is greater than the conduit D6 of the external wall 6 of the first conduit 5.

[0049] The invention is of course not limited to this embodiment, and the diameter DI 1 may be equal to, or less than, the diameter D6. Similarly, the diameter D7 may be equal to, less than or greater than the diameter D12.

[0050] In the illustrated embodiment, the first transport part 2 and the second transport part 3 are collinear, that is to say that the axes A and AA coincide.

[0051] As shown in the figures, the removable connection system 4 comprises an intermediate element 15 having a sleeve 16 defining an internal space V. The sleeve 16 has a generally cylindrical shape, the diameter of which is denoted DI6. The diameter D16 is greater than the larger of the diameters D6, DI1, in this case DI1 in the illustrated embodiment, which allows the sleeve 16 to slide on the wall 6, as will be detailed later. Alternatively, the internal diameter of the sleeve 16 is greater than at least one of the diameters D6, DI1, which allows the sleeve 16 to slide on the wall for which the sleeve has a larger diameter. In the illustrated embodiment, the sleeve 16 extends along the axis A.

[0052] As can be seen from [Fig.1], one end 17 of the inner wall 7 of the first conduit 5 extends into the internal space V of the intermediate element 15, and one end 18 of the inner wall 11 of the second conduit 10 extends into the internal space V of the intermediate element 15.

[0053] The sleeve 16 is mounted movably between a connected position, in which the sleeve 16 is removably attached to the first transport part 2 and the second transport part 3, and a disconnected position, in which the sleeve 16 is detached from the first transport part 2 and the second transport part 3.

[0054] The sleeve 16 extends between a first end 19 and a second end 20. In the connected position, the first end 19 is removably attached to an end 21 of the outer wall 6 of the first conduit 5 and the second end 20 is removablely attached to one end 22 of the outer wall 11 of the second conduit 10.

[0055] It is noted that assembly 1 includes a vacuum barrier VB-2 (“vacuum barrier” in English) in the space between the outer wall 6 and the inner wall 7 of the first transport part 2, which makes it possible not to lose the vacuum in the transfer line 2 when a disconnection of parts 2 and 3 is necessary, for example in the event of reconfiguration.

[0056] Preferably, assembly 1 includes a vacuum barrier VB-3 in the space between the outer wall 11 and the inner wall 12 of the second transport part 3, which makes it possible not to lose the vacuum in the second transport part 3 in the event of disconnection of parts 2 and 3.

[0057] The vacuum barriers VB-2, VB-3 allow the vacuum to be uncorrelated in each of the two parts 2, 3.

[0058] We denote C2-1 (respectively C3-1) the space of the vacuum barrier VB-2 (respectively VB-3) open on the internal space V of the intermediate element 15 and C2-2 (respectively C3-2) the space of the vacuum barrier VB-2 (respectively VB-3) open on the first transport part 2 (respectively second transport part 3).

[0059] Thus, three zones Z-2, Z-15, and Z-3 are defined. Zone Z-2 comprises the space between the inner wall 7 and the outer wall 6 in the first transport section 2 up to and including space C2-2. Zone Z-3 comprises the space between the inner wall 12 and the outer wall 11 in the second transport section 3 up to and including space C3-2. Zone Z-15 comprises the internal space V between the ends 19 and 20 of the sleeve 16, around the inner walls 7 and 12, and also includes spaces C2-1 and C3-1 of the vacuum barriers VB-2 and VB-3.

[0060] In each of the zones Z-2, Z-15 and Z-3, pressure, and preferably a vacuum, can be applied independently of the pressure applied in the other zones Z-2, Z-15 and Z-3. In other words, the zones Z-2, Z-15 and Z-3 represent independent vacuum zones.

[0061] Each vacuum barrier VB-2, VB-3 is for example a round trip system in the annular space between the inner conduit 7, 12 and the outer conduit 6, 11, respectively of the first conduit 5 and the second conduit 12, the system being adjusted so as to guarantee both a rigid mechanical connection, a seal and the longest possible thermal path.

[0062] As shown in Figures 1 to 4, the end 19 of the sleeve 16 has an external flange 23 into which the end 21 is fitted. The end 19 also has an internal interface 24 against which the outer wall 6 of the first conduit 5 is clamped. The flange 23 is a ring around the end 19 serving as an interface for rods 34, detailed later. Nuts E fix the flange 23 and the interface 24 in the connected position, a gasket ensuring sealing.

[0063] As also visible in the figures, the end 20 of the sleeve 16 carries a flange 25 and the end 22 of the first conduit 5 carries a collar 26. The flange 25 is a ring around the end 20. The system 4 also includes a free flange 25' attached to the flange 25 by nuts E in the connected position. In the connected position, the collar 26 is positioned against an inner edge of the flange 25, a seal ensuring the connection between the intermediate element 15 and the second transport part 3 is watertight. In other words, in the connected position, the flanges 25 and 25' are connected by the nuts E, sandwiching the collar 26 between the two.

[0064] As can be seen from figures 1 and 4, the end 17 of the first conduit 5 has a flange 27, as well as the end 18 of the second conduit 10 has a flange 28. Each of the flanges 27, 28 is a ring arranged around the respective end 17, 18. The flanges 27, 28 are preferably of the same dimensions and arranged against each other in a connected position, a gasket ensuring the seal.

[0065] The removable connection system 4 includes means for fixing the flanges 27, 28. In figures 1 to 4, these are nuts E.

[0066] Thus, in the illustrated embodiment, the removable connection system 4 comprises means 29 for removable fastening of the first transport part 2 to the intermediate element 15, which include the flange 23 of the sleeve 16, the internal interface 24 and fastening nuts E. And, the removable connection system 4 comprises means 30 for removable fastening of the second transport part 3 to the intermediate element 15, which include the flange 25 of the sleeve 16, the flange 25', and fastening nuts E. Of course, the invention is not limited to flange-to-flange fastening by nuts, and any other type of removable fastening can be envisaged.

[0067] Thus, the first transport part 2 and the second transport part 3 are removably connected to each other by the intermediate element 15 and the removable fastening means 29, 30.

[0068] It is noted that the flange 23, the interface 24 and the nuts E form an interface for fixing the sleeve 16 to the outer wall 6 of the first conduit 5. It is also noted that the flanges 25, 25' and the nuts E form an interface for fixing the sleeve 16 to the outer wall 11 of the second conduit (10).

[0069] The removable connection system 4 also includes means 31 for removablely securing the inner wall 7 of the first conduit 5 to the inner wall 12 of the second conduit 10, which comprise the flange 27 of the inner wall 7 and the flange 28 of the inner wall 12, and their fixing nuts E. Of course, the invention is not not limited to flange-to-flange fastening, by nuts, and any other type of removable fastening can be considered.

[0070] As shown in the figures, the sleeve 16 comprises a central portion 32 having a compensator 32-c for the outer wall and a protective sleeve 32-m around this compensator. This compensator serves to equalize small imperfections in length due to manufacturing and assembly. The compensator is, for example, a bellows comprising spirals, with the sleeve 32-m being arranged around the spirals. The intermediate element 15 comprises the rods 34 parallel to the axis A.

[0071] The rods 34 ensure the correct spacing of the two transport parts 2, 3 when they are assembled together, and when there is a vacuum in the space V, by counterbalancing the loads of the compressive forces. Because there is a vacuum inside, atmospheric pressure acts on the external elements of this connection (the sleeve, the flanges, the compensator 32-c). The rods 34 prevent the force of atmospheric pressure from compressing the external part of the assembly 1, especially through the compensator 32-c, and from introducing stresses in the external walls of the upstream and downstream parts. Since, for example, the external wall 11 is welded to the structure of the pump skid, there is no flexibility and there is a risk of damaging the structure.

[0072] It is noted that the assembly 1 advantageously comprises a multilayer insulator around the inner wall 7 of the first conduit 5 and the inner wall 12 of the second conduit 10, not shown in the figures, and / or an adsorbent, a chemical product which, by adsorption of particles / molecules, improves the vacuum in the space between the inner and outer walls.

[0073] As already indicated, the invention also relates to the installation 100. The installation 100 comprises at least one liquid dihydrogen tank, one or more transfer lines 2 and one or more pumps 3.

[0074] When the installation 100 is operating, a pressure difference is applied between the internal 7 and external 6 walls of the first conduit 5 and between the internal 12 and external 7 walls of the second conduit 10. This vacuum technique ensures optimal thermal insulation of the liquid dihydrogen circulating in the internal walls 7, 12.

[0075] In the Z-15 zone, the vacuum is generated by suction through the port P.

[0076] Between the two inner and outer walls, the two conduits are at zero pressure (empty), and, inside each of the pipes 7, 12, pressures can range between 1 bar and 5 bar (abs). These values ​​are specific to each application and may vary.

[0077] In other words, when the installation 100 is operating, zones Z-2, Z-3 and Z-15 are empty.

[0078] When the installation 100 is operating, the intermediate element 15 is in the connected position. The sleeve 16 is secured to the conduits 5, 10 by the fastening means 29, 30 and the internal walls 7, 12 are secured to each other by the fastening means 31.

[0079] When it is desired to disassemble the transfer line 2 from the second transport part 3, the intermediate element 15 and the first transport part 2 are separated, and the intermediate element 15 is separated from the second transport part 3. To do this, the fixing nuts E are loosened and then the sleeve 16 is moved along the transfer line 1, which exposes the internal walls 7, 12. It is then sufficient to loosen the fixing nuts of the flanges 27, 28, to disassemble the walls 7 and 12 from each other.

[0080] During disengagement, the vacuum is broken in the intermediate zone Z-15, but remains intact in the zones Z-2 and Z-3.

[0081] Advantageously, the internal space of the intermediate element is pre-filled with a gaseous fluid, for example nitrogen. The nitrogen saturates the multilayer insulation, which ensures that, when the sleeve 16 is moved, little air and water from the air penetrate the multilayer insulation.

[0082] As is already apparent from the preceding description, the present invention offers numerous combined advantages. Thus, thanks to the connection system 4, it is possible, without breaking the vacuum in the transfer line 2 (thanks to the vacuum barriers described previously), to couple and decouple the first transport section 2 from the second transport section 3, which makes it easy to change the arrangement of the installation 100 and facilitates its maintenance.

[0083] In the illustrated embodiment, the invention has been applied to a transfer line and a pump. However, of course, the invention is not limited to this configuration, and the invention also applies to the connection of two transfer lines, in particular.

[0084] Modifications and improvements to the above-described implementations of the present invention may be apparent to a person skilled in the art. The above description is illustrative by way of examples rather than exhaustive. The scope of the present invention is therefore limited only by the scope of the claims below.

Claims

Demands

1. Cryogenic liquid transport assembly, comprising a first transport part (2), and a second transport part (3), the first transport part (2) comprising a double-walled conduit, referred to as the first conduit (5), having an outer wall (6) and an inner wall (7), disposed at a distance from each other, the first transport part (2) being shaped to maintain a pressure difference between the inner wall (7) and the outer wall (6), the second transport part comprising a double-walled conduit, referred to as the second conduit (10), having an outer wall (11) and an inner wall (12), disposed at a distance from each other, the second transport part (3) being shaped to maintain a pressure difference between the inner wall (12) and the outer wall (11), the transport assembly (1) comprising a removable connection system (4) of the first transport part (2) to the second transport part (3).

2. Assembly according to claim 1, wherein the removable connection system (4) comprises an intermediate element (15) delimiting an internal space (V), an end (17) of the internal wall (7) of the first conduit (5) extending into said internal space (V) and an end (18) of the internal wall (12) of the second conduit (10) extending into said internal space (V), the removable connection system (4) comprising means for removable attachment of the first transport part (2) to the intermediate element (15) and means for removable attachment of the second transport part (3) to the intermediate element (15).

3. Assembly according to the preceding claim, wherein the intermediate element (15) comprises a sleeve (16) coaxial with the inner wall (7) of the first conduit (5) and the inner wall (12) of the second conduit (10).

4. Assembly according to the preceding claim, wherein an internal diameter of the sleeve (16) has a diameter greater than at least one of an external wall diameter (6) of the first conduit (5) and an external wall diameter (11) of the second conduit (10).

5. Assembly according to claim 3 or 4, wherein the means for removablely attaching the first transport part (2) to the intermediate element (15) comprise an interface of fixing (23, 24, E) of the sleeve to the outer wall (6) of the first conduit (5).

6. Assembly according to any one of claims 3 to 5, wherein the means for removable attachment of the second transport part to the intermediate element (15) include an attachment interface (25, 25', E) of the sleeve to the outer wall (11) of the second conduit (10).

7. Assembly according to any one of claims 2 to 6, wherein the removable connection system (4) comprises removable fixing means (27, 28, E) from the end (17) of the inner wall (7) of the first conduit (5) to the end (18) of the inner wall (12) of the second conduit (10).

8. Assembly according to any one of the preceding claims, wherein the intermediate element (15) comprises a first receiving flange (23) of the outer wall (11) of the first transport part (2), and a second receiving flange (25) of the outer wall (11) of the second transport part (3).

9. Assembly according to the preceding claim, wherein the intermediate element comprises at least one stiffening rod (34) extending between the first receiving flange (23) of the outer wall and the second receiving flange (25) of the outer wall.

10. Assembly according to any one of the preceding claims, comprising a length compensator (14) between the inner wall (7) of the first transport part (2) and the inner wall (12) of the second transport part (3).

11. Assembly according to any one of the preceding claims, comprising a length compensator (32) between the outer wall (6) of the first transport part (2) and the outer wall (11) of the second transport part (3).

12. Assembly according to any one of the preceding claims, comprising a multilayer insulation around the internal walls (7, 12) respectively of the first conduit (5) and the second conduit (10).

13. Assembly according to any one of the preceding claims, comprising a vacuum barrier between the outer wall (6) and the inner wall (7) of the first transport part (2), such that the pressure difference between the outer wall (6) and the inner wall (7) of the first transport part (2) remains unchanged in the event of disconnection of the second transport part (3).

14. Assembly according to any one of the preceding claims, comprising a vacuum barrier between the outer wall (11) and the inner wall (12) of the second transport part (3), such that the pressure difference between the outer wall (11) and the inner wall (12) of the second transport part (3) remains unchanged in the event of disconnection of the first transport part (2).

15. A method for disconnecting the first transport part (2) and the second transport part (3) from the transport assembly (1) according to claim 3 or any one of claims 4 to 8 in their dependence on claim 3, comprising a step of filling the internal space (V) of the intermediate element (15) with a gaseous fluid, a step of removably separating the intermediate element (15) and the first transport part (2), and a step of removably separating the intermediate element (15) and the second transport part (3), then a step of translating the intermediate element (15) along the outer wall (6) of the first conduit (5) or the outer wall (6) of the second conduit (10).

16. Liquid dihydrogen storage and transport installation, comprising an assembly according to any one of claims 1 to 8 and a liquid dihydrogen storage tank.

17. Use of the assembly according to any one of claims 1 to 8 for the transport of liquid dihydrogen.

Images