Staged catalyst regeneration in a baffled fluidized bed

Details Staged catalyst regeneration in a baffled fluidized bed Staged catalyst regeneration in a baffled fluidized bed

B - Operations, Transporting

01

J

196/112, 252/1.E

B01J 38/34 (2006.01) C10G 11/18 (2006.01)

Patent

CA 2301239

Staged combustion in a single regenerator of a FCC unit is disclosed. The regenerator has fi spent catalyst distributor at the top of the catalyst bed, and an air grid at the lower end of the bed. A baffle separates the catalyst bed into upper and lower stages. Excess oxygen is present in the lower bed; partial CO combustion mode is maintained in the upper bed. The baffle inhibits backmixing flux to achieve sufficient staging to bum the catalyst clean under partial CO combustion. This achieves a clean bum of the catalyst in a single regenerator vessel in the partial CO combustion operating mode. Surprisingly, the baffle also reduces catalyst entrainment in the dilute phase, thereby cutting particulate emissions from the regenerator and reducing cyclone wear.

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