FCC high efficiency partial burn regenerator

Patent metadata

Field	Value
Publication number	US-10399075-B2
Application number	US-201815997188-A
Country	US
Kind code	B2
Filing date	Jun 4, 2018
Priority date	Dec 18, 2015
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A process for combusting coke from catalyst in partial burn mode is disclosed. The partial burn regenerator runs deprived of oxygen such that the flue gas will contain a fair amount of carbon monoxide. The oxygen present in the flue gas can burn in the bed before reaching the dilute phase. The catalyst distributor is positioned in the upper chamber of the regeneration vessel for discharging the catalyst.

First claim

The invention claimed is:

1. A process for combusting coke from catalyst comprising:
delivering coked catalyst to a lower chamber of a regeneration vessel;
contacting coked catalyst with oxygen to combust coke from the coked catalyst in a partial burn mode;
transporting catalyst and flue gas from the lower chamber to an upper chamber of the regeneration vessel through a first distributor into a dense catalyst bed in the upper chamber, wherein said first distributor discharges the catalyst from under a top surface of the dense catalyst bed in the upper chamber;
supplying oxygen to the dense catalyst bed through a second distributor positioned below said first distributor;
separating flue gas from regenerated catalyst in the upper chamber;
discharging regenerated catalyst from said upper chamber; and
discharging flue gas from said upper chamber.

2. The process of claim 1 wherein said first distributor has a header defining a longitudinal axis and discharging said catalyst at an acute angle to said longitudinal axis.

3. The process of claim 1 further including discharging catalyst from said first distributor through nozzles with a bottom disposed in the lower quarter of said header.

4. The process of claim 1 wherein said first distributor is disposed in lower third of the upper chamber.

5. The process of claim 1 further comprising discharging catalyst from said first distributor horizontally.

6. The process of claim 2 wherein said first distributor has an inlet end and discharges catalyst at angles to said longitudinal axis, said angles successively decrease as the distance from the inlet end increases.

7. The process of claim 1 further comprising transporting flue gas with catalyst from the lower chamber to the upper chamber through a plurality of headers each defining longitudinal axis.

8. The process of claim 7 further comprising transporting the catalyst and flue gas upwardly from the lower chamber to said first distributor.

9. A process for combusting coke from catalyst comprising:
contacting hydrocarbon feed with catalyst to produce cracked products and coked catalyst;
separating said cracked products from said coked catalyst;
delivering said coked catalyst to a lower chamber of a regeneration vessel;
contacting coked catalyst with oxygen to combust coke from the coked catalyst;
transporting catalyst and flue gas from the lower to an upper chamber of the regeneration vessel through a first distributor into a dense catalyst bed in the upper chamber, wherein said first distributor discharges the catalyst from under a top surface of the dense catalyst bed in the upper chamber;
contacting coked catalyst with oxygen discharged from a second distributor to combust coke from the coked catalyst in the dense catalyst bed of the upper chamber, said second distributor being positioned below said first distributor;
separating flue gas from regenerated catalyst in the upper chamber;
discharging regenerated catalyst from said upper chamber; and
discharging flue gas from said upper chamber.

10. The process of claim 9 further including discharging catalyst from said first distributor horizontally.

11. The process of claim 9 further comprising discharging the catalyst from the said first distributor into the upper chamber at an acute angle to a longitudinal axis and wherein said first distributor includes a header defining the longitudinal axis.

12. The process of claim 9 further comprising transporting the catalyst and flue gas upwardly from the lower chamber to said first distributor and wherein said first distributor is disposed in lower third of the upper chamber.

13. A catalyst regenerator vessel for combusting coke from catalyst comprising:
a lower chamber having a catalyst inlet for feeding spent catalyst to said lower chamber and a gas distributor for distributing combustion gas to said lower chamber;
an upper chamber having a catalyst distributor having an inlet in the lower chamber and an outlet in the upper chamber for distributing catalyst from said lower chamber to said upper chamber, said catalyst distributor being disposed in lower third of the upper chamber, wherein said distributor discharges catalyst from under a top surface of a dense catalyst bed in the upper chamber;
a combustion gas distributor positioned below said catalyst distributor and configured to supply oxygen to the dense catalyst bed;
a separator in communication with said regenerator vessel for separating flue gas from said catalyst;
a flue gas outlet for discharging flue gas from said vessel; and
a regenerated catalyst outlet for discharging regenerated catalyst from said vessel.

14. The catalyst regenerator vessel of claim 13 wherein the catalyst distributor comprises a header having a longitudinal axis and an angular nozzle in communication with said header, said angular nozzle defining an acute angle with said longitudinal axis for discharging catalyst into said upper chamber.

15. The catalyst regenerator vessel of claim 14 wherein a bottom of said nozzle is disposed in the bottom quarter of said header.

16. The catalyst regenerator vessel of claim 14 wherein a longitudinal axis through said nozzle is horizontal.

17. The catalyst regenerator vessel of claim 14 including two angular nozzles defining two different angles with said longitudinal axis.

18. The catalyst regenerator vessel of claim 14 including a plurality of nozzles and said angular nozzle, said header having an entrance and an outer end, said nozzles defining smallest angles with said longitudinal axis that successively decrease as the nozzles are positioned further away from entrance and closer to said outer end.

19. The catalyst regenerator vessel of claim 13 further comprising a riser in the lower chamber having a decreased cross-sectional area, said catalyst distributor being connected to said riser.

Assignees

• Uop Llc

Inventors

• Palmas Paolo

Classifications

• B01J2208/00911

  Sparger-type feeding elements · CPC title

• B01J38/04

  Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst · CPC title

• B01J8/26

  with two or more fluidised beds, e.g. reactor and regeneration installations · CPC title

• C10G11/22

  produced by partial combustion of the material to be cracked · CPC title

• B01J2208/00902

  Nozzle-type feeding elements · CPC title