Fcc feed injection using subcooled water sparging for...

C - Chemistry – Metallurgy – 10 – G

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C10G 11/00 (2006.01) C10G 11/18 (2006.01) C10G 35/00 (2006.01)

Patent

CA 2349831

Atomization of a high boiling point, hot liquid, such as a hydrocarbon feed oil for a fluid cat cracker, is enhanced by injecting subcooled water into the hot liquid, to form a two-phase fluid of the liquid and steam, upstream of the atomization. The hot liquid is at conditions of temperature and pressure effective for the injected, subcooled water to vaporize into steam, when the water contacts it. Typically this means that the hot liquid is hotter and at a lower pressure than the water. In an FCC process, the subcooled water is sparged into the flowing hot oil in a conduit (34) in a riser feed injector (10). This produces a spray of hot oil in the riser reaction zone (22) in which the oil drops are smaller and more uniformly distributed in the spray.

On accentue l'atomisation d'un liquide chaud à point d'ébullition élevée, tel qu'une huile d'hydrocarbure alimentant des opération de craquage catalytique sur lit fluidisé, en injectant de l'eau sous-refroidie pour former un fluide à deux phases (liquide et vapeur) en amont de la zone d'atomisation. Le liquide chaud présente les conditions de température et de pression requises pour que l'eau injectée sous-refroidie se vaporise au contact dudit liquide. De façon générale, il en résulte que le liquide chaud se trouve à une température plus élevée et à une moindre pression que l'eau. Dans le craquage catalytique sur lit fluidisé, l'eau sous-refroidie est injectée dans le flux d'huile chaude dans un conduit (34) d'un injecteur élévateur (10). Il en résulte une vaporisation d'huile chaude dans la zone de réaction (22)caractérisée par des gouttes d'huile plus petites et réparties plus uniformément.

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