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AssigneePetroleo Brasileiro S.A. - Petrobras
InventorsJose Mozart Fusco, Emanuel Freire Sandes, Naiara Dos Santos Lages, Geovani Aliatti, Jose Geraldo Furtado Ramos, Ricardo Serfaty, Nelson Patricio Junior, JR.
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The present invention relates to a combustion device for meeting the energy demand of processes for producing light olefins (ethylene and propene) in fluidized-bed catalytic cracking units. Said combustion device is used to burn heating oil and to keep burning the coke deposited on the catalyst, with a view to heating it to meet the energy demand of the reaction, combustion taking place smoothly and uniformly, preventing the formation of hotspots within the catalytic bed and in the dilute phase following combustion (afterburning), thereby minimizing deactivation of the catalyst and the risk of damage to the equipment inside of the combustion device.
High-performance combustion device, characterized in that it comprizes a vessel with two distinct sections, specifically a lower section (17) and an upper section (18), in which the lower section (17) contains a turbulent fluidized catalyst bed (14) in which the oil and the coke of the spent catalyst are burned, with fluidization and burning air (19) supplied to the lower section (17) of the fluidized bed (14) through one or more pipe-grid distributors (21), with the heating oil (24) supplied through a plurality of spray nozzles installed at the extremity of the lances (26) located inside the lower section (17) of the fluidized bed (14) above the pipe-grid distributors (21), with the spent catalyst fed through the inclined tubing or spent-catalyst standpipe (12a), with the heated and regenerated catalyst removed from the fluidized bed (14) through a regenerated-catalyst standpipe (12b) located in the lower section (17) of the fluidized bed (14).
Catalytic cracking process, characterized by the side-by-side arrangement of the entire installation for the process undertaken, in which the separating vessel (10) coupled to a lower stripper (9) and the combustion device (1) are side-by-side at different heights, and in that, in this arrangement, the regenerated-catalyst (12b) and spent-catalyst (12a) standpipes are inclined and outside the vessel of the combustion device (1).
Dependencies are inferred from the claim text.