FCC counter-current regenerator with a regenerator riser
AssigneeUop LLC
InventorsLev Davydov, Michael S. Sandacz, Paolo Palmas, Zhihao Fei, Matthew Lippmann
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Abstract
A counter-current catalyst regenerator with at least two stages of counter-current contact along with a regenerator riser is proposed. Each stage may comprise a permeable barrier that allows upward passage of oxygen-containing gas and downward passage of coked catalyst into each stage, but inhibits upward movement of catalyst to mitigate back mixing and approximate true counter-current contact and efficient combustion of coke from catalyst. The regenerator riser may provide a passage to transport the catalyst and may serve as a secondary stage for coke combustion to provide the regenerated catalyst.
Claims19
A regenerator vessel for combusting coke from coked catalyst, the regenerator vessel comprising:
- (a) a regeneration section and a separation section, the regeneration section is a fluid tight containment vessel having one or more windows to permit the passage of the coked catalyst from the separation section to the regeneration section;
- (b) a regenerator riser comprising:
- (i) an inlet in a bottom of the regenerator riser in downstream communication with a spent catalyst standpipe for feeding the coked catalyst;
- and
- (ii) an outlet for discharging catalyst from the regenerator riser;
- (c) a one or more stages located above the inlet of the regenerator riser and below the outlet of the regenerator riser, each of the one or more stages comprising a permeable barrier comprising openings sized to permit the catalyst to pass through downwardly, the permeable barriers extending laterally across the regenerator vessel;
- (d) a combustion gas distributor for passing a primary stream of oxygen-containing gas upwardly through the one or more stages in counter-current contact with the catalyst to combust coke from the coked catalyst to provide a regenerated catalyst and a flue gas;
- (e) a regenerated catalyst outlet, the regenerated catalyst outlet located below the one or more stages;
- (f) one or more cyclone separators for separating catalyst from the flue gas;
- and
- (g) a flue gas outlet in the regenerator vessel.
A regenerator vessel for combusting coke from coked catalyst, the regenerator vessel comprising:
- (a) a regenerator riser extending upwardly through the regenerator vessel comprising:
- (i) an inlet in a bottom of the regenerator riser in downstream communication with a spent catalyst standpipe for feeding the coked catalyst;
- and
- (ii) an outlet for discharging catalyst from the regenerator riser;
- (b) a one or more stages located above the inlet of the regenerator riser and below the outlet of the regenerator riser, each of the one or more stages comprising a permeable barrier comprising openings sized to permit the catalyst to pass through downwardly, the permeable barriers extending laterally across the regenerator vessel;
- (c) a combustion gas distributor for passing a primary stream of oxygen-containing gas upwardly through the one or more stages in counter-current contact with the catalyst to combust coke from the coked catalyst to provide a regenerated catalyst and a flue gas;
- (d) a regenerated catalyst outlet, the regenerated catalyst outlet located below the one or more stages;
- (e) one or more cyclone separators for separating catalyst from the flue gas;
- and
- (f) a flue gas outlet in the regenerator vessel.
Dependencies are inferred from the claim text.