Process for the on-stream decoking of a furnace for cracking...

C - Chemistry – Metallurgy – 10 – G

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C10G 9/16 (2006.01) C10G 9/20 (2006.01)

Patent

CA 2728567

A process for the on-stream decoking of a steam cracking furnace, the steam cracking furnace including multiple tube banks positioned between a hydrocarbon feedstock inlet and a convection section to radiant section crossover, each tube bank including a plurality of tubes arranged within the tube bank, the process comprising the steps of terminating the flow of hydrocarbon feed to a portion of the plurality of tubes of less than all of the multiple tube banks, and supplying a decoking feed comprising steam to the portion of the plurality of tubes of less than all of the multiple tube banks in sufficient amount to effect removal of coke accumulated on the interior of the radiant coils and quench system components fed by such tubes while maintaining a temperature at the convection section to radiant section crossover of below about 788- C.

L'invention porte sur un procédé pour le décokage en marche productive d'un four de craquage à la vapeur d'eau, le four de craquage à la vapeur d'eau comprenant de multiples faisceaux de tubes positionnés entre une entrée de charge d'alimentation hydrocarbonée et un croisement section de convection à section radiante, chaque faisceau de tubes comprenant une pluralité de tubes disposés à l'intérieur du faisceau de tubes. Le procédé comprend les étapes consistant à terminer l'écoulement d'alimentation hydrocarbonée à une partie des différents tubes de moins de la totalité des faisceaux de tubes multiples, et à adresser une alimentation de décokage comprenant de la vapeur d'eau à la partie de pluralité de tubes de moins de la totalité des faisceaux de tubes multiples en une quantité suffisante pour effectuer une élimination du coke accumulé sur l'intérieur des serpentins radiants et des composants de système de refroidissement brusque alimentés par de tels tubes tout en maintenant une température au croisement section de convection à section radiante d'environ 788 C.

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