Metal tube for pyrolysis reaction

F - Mech Eng,Light,Heat,Weapons – 28 – F

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F28F 1/40 (2006.01) C10G 9/20 (2006.01)

Patent

CA 2655932

A metal tube in the present invention is a metal tube for pyrolysis reaction with superior characteristics of both the heat exchange and the pyrolysis reaction, which is suitable for use in a process in which hydrocarbons are pyrolytically decomposed. The tube is a metal tube for pyrolysis reaction consisting of 3 or 4 spiral ribs1 provided on an inner surface which are inclined at 20 to 35 degrees to an axial direction of the metal tube, and characterized in that h/Di of 0.1 to 0.2 and h/w of 0.25 to 1.0 when a height of the rib1 is defined as "h", a width of the rib1 at its bottom part is defined as "w" and an inner diameter of the tube at the bottom part is defined as "Di" in cross section of the spiral rib1.

La présente invention concerne un tube métallique destiné à une réaction de craquage thermique qui présente simultanément d'excellentes capacités d'échange de chaleur et de réaction de craquage thermique et dont l'utilisation convient à un procédé de craquage thermique d'hydrocarbures. Le tube est un tube métallique, destiné à des réactions de craquage thermique, qui comprend sur sa surface circonférentielle interne trois ou quatre nervures (1) s'étendant telles des spirales et présentant un angle d'inclinaison compris entre 20° et 35° par rapport à la direction de l'axe du tube. Ledit tube se caractérise en ce que, lorsque la hauteur de la nervure correspond à h dans la section transversale des nervures (1), la largeur de la nervure sur le fond de la vallée correspond à w et le diamètre interne du fond de la vallée du tube correspond à Di, le rapport h/Di se trouve dans une plage comprise entre 0,1 et 0,2 et le rapport h/w se trouve dans une plage comprise entre 0,25 et 1,0.

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