FCC counter-current regenerator with a regenerator riser
AssigneeUpo 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.
Claims20
A process for combusting coke from coked catalyst in a regenerator vessel comprising a separation section and a regeneration section located below the separation section, the process comprising:
- providing a coked catalyst to the regeneration section through a catalyst inlet in the regeneration section;
- passing the coked catalyst downwardly through a one or more stages, each of the one or more stages comprising a permeable barrier;
- passing a primary stream of oxygen-containing gas upwardly through the one or more stages in counter-current contact with the coked catalyst to combust coke from the coked catalyst to provide a regenerated catalyst and a flue gas;
- passing the regenerated catalyst from the regeneration section to a bottom of the regenerator riser;
- propelling the regenerated catalyst via a secondary stream of gas to move the regenerated catalyst from the bottom of the regenerator riser to an outlet located in the separation section;
- discharging the regenerated catalyst to the separation section from the outlet of the regenerator riser;
- and
- passing the regenerated catalyst from a regenerated catalyst outlet in the separation section to a riser reactor through a regenerated catalyst standpipe.
A process for combusting coke from coked catalyst in a regenerator vessel comprising a separation section and a regeneration section located below the separation section, the process comprising:
- providing a coked catalyst to the regeneration section through a catalyst inlet in the regeneration section;
- passing the coked catalyst downwardly through a one or more stages, each of the one or more stages comprising a permeable barrier;
- passing a primary stream of oxygen-containing gas upwardly through the one or more stages in counter-current contact with the coked catalyst to combust coke from the coked catalyst to provide a partially regenerated catalyst and a flue gas;
- passing the partially regenerated catalyst from the regeneration section to a bottom of the regenerator riser;
- propelling the partially regenerated catalyst via a secondary stream of oxygen-containing gas to move the regenerated catalyst from the bottom of the regenerator riser to an outlet located in the separation section while combusting coke from the partially regenerated catalyst to provide a completely regenerated catalyst;
- discharging the completely regenerated catalyst to the separation section from the outlet of the regenerator riser;
- and
- passing the completely regenerated catalyst from a regenerated catalyst outlet in the separation section to a riser reactor through a regenerated catalyst standpipe.
A regenerator vessel for combusting carbonaceous deposits from catalyst comprising:
- (a) a regeneration section comprising:
- (i) a catalyst inlet for feeding coked catalyst;
- (ii) a one or more stages located below the catalyst inlet, each of the one or more stages comprising a permeable barrier comprising openings sized to permit the coked catalyst to pass through downwardly, the permeable barrier extending laterally across the regenerator vessel;
- and
- (ii) 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 coked catalyst to combust coke from the coked catalyst to provide a regenerated catalyst and a flue gas;
- (b) a regenerator riser comprising:
- (i) an inlet in a bottom of the regenerator riser in downstream communication with regeneration section via a regeneration section outlet for receiving the regenerated catalyst;
- and
- (ii) an outlet of the regenerator riser for discharging the regenerated catalyst;
- and
- (c) a separation section above the regeneration section, the separation section comprising:
- (i) one or more cyclone separators for separating catalyst from the flue gas;
- (ii) a regenerated catalyst outlet;
- (iii) the outlet of the regenerator riser;
- and
- (iv) a flue gas outlet in the regenerator vessel.
Dependencies are inferred from the claim text.