Process and apparatus for removing coke formed during steam...

Details Process and apparatus for removing coke formed during steam... Process and apparatus for removing coke formed during steam...

C - Chemistry, Metallurgy

10

G

C10G 9/00 (2006.01) C10G 9/20 (2006.01)

Patent

CA 2567168

A process for decoking of a process that cracks hydrocarbon feedstock containing resid and coke precursors, wherein steam is added to the feedstock to form a mixture which is thereafter separated into a vapor phase and a liquid phase by flashing in a flash/separation vessel, separating and cracking the vapor phase, and recovering cracked product. Coking of internal surfaces in and proximally downstream of the vessel is controlled by interrupting the feed flow, purging the vessel with steam, introducing an air/steam mixture to at least partially combust the coke, and resuming the feed flow when sufficient coke has been removed. An apparatus for carrying out the process is also provided.

L'invention porte sur un procédé de décokage d'un procédé de craquage de charges d'hydrocarbures contenant des résidus et des précurseurs de coke, de la vapeur étant ajoutée dans la charge afin de former un mélange qui est par la suite séparé en une phase vapeur et une phase liquide par vaporisation instantanée dans un récipient de vaporisation instantanée/séparation, par séparation et craquage de la phase vapeur, et par récupération du produit craqué. Le cokage des surfaces internes en aval et à proximité de l'aval du récipient est contrôlé par interruption du débit d'alimentation, par nettoyage du récipient à la vapeur, par introduction d'un mélange air/vapeur afin de brûler au moins partiellement la coke, puis par reprise du débit d'alimentation lorsqu'une quantité de coke suffisante a été ôtée. L'invention porte également sur un appareil permettant de mettre en oeuvre ce procédé.

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