Reaction tube system of a steam reformer

Details Reaction tube system of a steam reformer Reaction tube system of a steam reformer

C - Chemistry, Metallurgy

10

G

48/19, 196/81

C10G 9/20 (2006.01) B01J 19/00 (2006.01) C01B 3/26 (2006.01) C10G 11/00 (2006.01)

Patent

CA 1253105

ABSTRACT OF THE DISCLOSURE A reaction tube system of a steam reformer, more gener- ally referred to as tubular cracking furnace, for the indirect heating of cracking feedstock, particularly for the catalytic cracking of hydrocarbons, comprises a plurality of reaction tubes and headers. The reaction tubes penetrating through the bottom of the steam reformer and being extended to the associated header by low-alloy tube sections attached to them by circumferential welds. To prevent deterioration by corrosion of the wells joining tube sections of high-alloy and low-alloy and unalloyed material the reaction tubes are surrounded in the area of the welds by coaxial protective tubes having one open end and providing for a free annular space around the reaction tube.

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