Structured body for heating gas

1 . A structured body arranged for heating a feed gas, said structured body comprising a first macroscopic structure and a second macroscopic structure, each extending in a longitudinal direction from a first end to a second end, where said first end forms an inlet to said first and second macroscopic structures for said feed gas and said second end forms an outlet for heated gas, said first and second macroscopic structure comprising a three-dimensional network structure, wherein the network structure forms flow paths allowing the feed gas to flow from said first end to said second end, the network structure being formed by a metallic material being electrically conductive, wherein the second macroscopic structure is arranged at least partly circumferentially around the first macroscopic structure, and wherein the first and second macroscopic structures are electrically connected at the second end.

2 . A structured body according to claim 1 , wherein the network structure at least partly supports a ceramic coating.

3 . A structured body according to claim 2 , wherein at least a part of the ceramic coating supports a catalytically active material.

4 . A structured body according to claim 1 , wherein at least a part of the network structure forms a plurality of parallel flow channels.

5 . A structured body according to claim 1 , wherein at least one of the first and second macroscopic structures comprises a circumferential wall forming an internal space, the circumferential wall being formed of a metallic material being electrically conductive, and wherein the network structure is arranged in the internal space.

6 . A structured body according to claim 1 , wherein the second macroscopic structure is arranged circumferentially around at least 50% of an outer surface of the first macroscopic structure.

7 . A structured body according to claim 1 , further comprising one or more additional macroscopic structures, wherein each additional macroscopic structure is arranged at least partly circumferentially around the macroscopic structure arranged closest to the additional macroscopic structure on its inside side, and wherein neighboring macroscopic structures are electrically connected alternatingly at the first end and at the second end.

8 . A structured body according to claim 7 , comprising a first additional macroscopic structure, wherein the first additional macroscopic structure is arranged at least partly circumferentially around the second macroscopic structure, and wherein the second and first additional macroscopic structures are electrically connected at the first end.

9 . A structured body according to claim 1 , wherein an outer surface of the first macroscopic structure matches an inner surface of the second macroscopic structure.

10 . A structured body according to claim 9 , wherein the outer surface of the first macroscopic structure in a cross-section transverse to the longitudinal direction is substantially circular.

11 . A structured body according to claim 1 , wherein the first and second macroscopic structures are arranged substantially co-axially.

12 . A structured body according to claim 1 , further comprising at least a first and a second conductor electrically connected to said first and second macroscopic structures, respectively, and to an electrical power supply, wherein said electrical power supply is dimensioned to heat at least part of said first and second macroscopic structure to a temperature of at least 500° C. by passing an electrical current through said macroscopic structures, the conductors being connected at positions on the first and second macroscopic structures closer to said first end than to said second end, the structured body being configured to direct an electrical current to run from the first conductor through the first macroscopic structure to said second end, then through the second macroscopic structure to the second conductor.

13 . A structured body according to claim 12 , wherein the first and second macroscopic structures each comprises an attachment section to allow attachment of first and second conductor, respectively, wherein the attachment section is 3D printed in one piece with the first and second macroscopic structures.

14 . A structured body according to claim 1 , wherein at least one of the first and second macroscopic structures comprises flow guides to ensure flow distribution, wherein the flow guides are 3D printed as one piece with the at least one macroscopic structure.

15 . A structured body according to claim 1 , wherein the metallic material is an alloy comprising one or more substances selected from the group consisting of Fe, Cr, Al, Co, Ni, Zr, Cu, Ti, Mn, and Si.

16 . A heating system for heating of a feed gas, said heating system comprising:

a) at least one structured body according to claim 1 ;

b) a pressure shell housing said structured body, said pressure shell comprising an inlet for letting in said feed gas and an outlet for letting out heated gas, wherein said inlet is positioned so that said feed gas enters said structured body in a first end and said heated gas exits said body from a second end; and

c) a heat insulation layer between said structured body and said pressure shell.

17 . A process for heating a feed gas in a heating system according to claim 16 ; said process comprising the steps of:

pressurizing said feed gas,

supplying said pressurized feed gas to the heating system,

supplying electrical power via electrical conductors connecting an electrical power supply placed outside said pressure shell to said structured body, allowing an electrical current to run through said electrically conductive material, thereby heating at least part of the structured body,

heating the feed gas over the structured body, and

outletting a heated gas from the heating system.

18 . A reactor system for carrying out an endothermic reaction of a feed gas, said reactor system comprising:

a) a structured body according to claim 1 ;

b) a pressure shell housing said structured body, said pressure shell comprising an inlet for letting in said feed gas and an outlet for letting out product gas, wherein said inlet is positioned so that said feed gas enters said structured body in a first end and said product gas exits said catalyst from a second end; and

c) a heat insulation layer between said structured body and said pressure shell.

19 . A method comprising using the reactor system according to claim 18 , wherein the endothermic reaction is selected from the group consisting of steam methane reforming, hydrogen cyanide formation, methanol cracking, ammonia cracking, reverse water gas shift and dehydrogenation.