Method of loading a tubular reactor with a catalyst tube assembly, and a catalyst tube assembly for a tubular reactor

1. Method of loading a tubular reactor with a catalyst tube assembly comprising:

providing a tubular reactor, including an outer reactor tube having an inlet end and an outlet end opposite the inlet end, and including an inwardly protruding element;

providing a tubular boundary having a closed end and an open end;

providing a centering assembly including an inner tube having an inlet end and an outlet end, wherein the outlet end of the inner tube includes at least one sealing member;

providing annular catalyst structures;

mounting said annular catalyst structures around said tubular boundary;

inserting said centering assembly substantially coaxially into the outer reactor tube until the at least one sealing member engages the inwardly protruding element, wherein the centering assembly is inserted into the outer reactor tube before the tubular boundary is mounted over the centering assembly; and

mounting said tubular boundary substantially coaxially over said centering assembly.

2. Method according to claim 1 , wherein the tubular boundary is mounted over the centering assembly before the centering assembly is inserted into the outer reactor tube.

3. Method according to claim 1 , wherein the annular catalyst structures are mounted around the tubular boundary before mounting said tubular boundary over the centering assembly.

4. Method according to claim 1 , wherein the tubular boundary is mounted over the centering assembly before the annular catalyst structures are mounted around the tubular boundary.

5. Method according to claim 1 , wherein ring-shaped elements are mounted around the catalyst structures radially compressing said annular catalyst structures.

6. Method according to claim 5 , wherein the ring-shaped elements are removed or destructed after insertion into the outer reactor tube of the tubular boundary on which the annular catalyst structures are mounted.

7. Method of unloading a catalyst tube assembly from a tubular reactor comprising:

providing a tubular reactor loaded with a catalyst tube assembly following

the method according to claim 1 ;

removing, in particular sliding out, the tubular boundary from the tubular reactor, in particular from the outer reactor tube;

removing, in particular, sliding out, the centering assembly from the tubular reactor, in particular from the outer reactor tube.

8. Method according to claim 7 , wherein removing the tubular boundary causes the centering assembly to be removed as well.

9. Catalyst tube assembly for loading a tubular reactor, comprising:

an outer reactor tube having an inlet end and an outlet end opposite the inlet end, and including an inwardly protruding element, the catalyst tube assembly comprising:

a centering assembly including an inner tube having an inlet end and an outlet end;

a tubular boundary having a closed end and an open end, wherein the tubular boundary is mounted over the centering assembly; and

wherein the tubular boundary is configured to extend substantially coaxially within the outer reactor tube and substantially coaxially around the inner tube, such that the catalyst tube assembly includes a first annular channel between the outer reactor tube and the tubular boundary that is arranged for containing an annular catalyst structure, and a second annular channel between the tubular boundary and the inner tube, wherein the second annular channel is in fluid connection with the first annular channel near the open end of the tubular boundary, and in fluid connection with the inner tube at the closed end of the tubular boundary wherein the outlet end of the inner tube includes at least one sealing member configured to be in sealing engagement with the inwardly protruding element of the outer reactor tube.

10. Catalyst tube assembly according to claim 9 , wherein the protruding element is a catalyst grid.

11. Catalyst tube assembly according to claim 9 , wherein the at least one sealing member has a conical shape, a ring-like shape, or a cylindrical shape.

12. Catalyst tube assembly according to claim 9 , wherein an external diameter of the at least one sealing member is smaller than an internal diameter of the outer reactor tube near the inwardly protruding element.

13. Catalyst tube assembly according to claim 9 , wherein the inner tube includes spacers mounted on an external side of the inner tube and configured to maintain a gap between the inner tube and the tubular boundary.

14. Catalyst tube assembly according to claim 9 , wherein the tubular boundary is fixedly attached to the at least one sealing member.

15. The method of claim 1 , wherein the tubular reactor is a steam reformer.

16. Method according to claim 1 , wherein the annular catalyst structures are mounted around the tubular boundary before mounting said tubular boundary over the centering assembly.

17. Method according to claim 2 , wherein the annular catalyst structures are mounted around the tubular boundary before mounting said tubular boundary over the centering assembly.

18. Method according to claim 1 , wherein the tubular boundary is mounted over the centering assembly before the annular catalyst structures are mounted around the tubular boundary.

19. Method according to claim 2 , wherein the tubular boundary is mounted over the centering assembly before the annular catalyst structures are mounted around the tubular boundary.

20. Method of loading a tubular reactor with a catalyst tube assembly comprising:

providing a tubular reactor, including an outer reactor tube having an inlet end and an outlet end opposite the inlet end, and including an inwardly protruding element;

providing a tubular boundary having a closed end and an open end;

providing a centering assembly including an inner tube having an inlet end and an outlet end, wherein the outlet end of the inner tube includes at least one sealing member;

providing annular catalyst structures;

mounting said annular catalyst structures around said tubular boundary;

inserting said centering assembly substantially coaxially into the outer reactor tube until the at least one sealing member engages the inwardly protruding element; and

mounting said tubular boundary substantially coaxially over said centering assembly, wherein the annular catalyst structures are mounted around the tubular boundary before mounting said tubular boundary over the centering assembly.