Partial burn combustor regenerator

Patent metadata

Field	Value
Publication number	US-10960390-B2
Application number	US-201816052311-A
Country	US
Kind code	B2
Filing date	Aug 1, 2018
Priority date	May 12, 2016
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A process for combusting coke from catalyst in partial burn mode is disclosed. The regenerator comprises two chambers. The bulk of the combustion is performed in a first chamber. Disengagement of the catalyst from gas is conducted in the second chamber. Heated gas with a low fraction of oxygen fluidizes catalyst in the second chamber.

First claim

The invention claimed is:

1. A process for regenerating coked catalyst comprising:
contacting coked catalyst with oxygen in a first chamber of a regenerator to combust coke from said coked catalyst to provide regenerated catalyst and a flue gas stream;
passing said regenerated catalyst and said flue gas stream from said first chamber to a second chamber of said regenerator;
contacting a hydrocarbon fuel with air to combust the fuel and provide a heated gas stream; and
distributing said heated gas stream to the second chamber separately from said flue gas stream.

2. The process of claim 1 further comprising operating said first chamber with insufficient oxygen in order to promote partial burn conditions.

3. The process of claim 1 further comprising distributing said heated gas stream to fluidize regenerated catalyst in said second chamber.

4. The process of claim 1 further comprising cooling said heated gas stream before it is distributed to said second chamber.

5. The process of claim 1 wherein said heated gas stream comprises no more than 2 wt % oxygen.

6. The process of claim 1 further comprising contacting a hydrocarbon fuel with air to combust the fuel and provide a heated gas stream to said first chamber.

7. The process of claim 1 further comprising separating gas from said regenerated catalyst in said second chamber.

8. The process of claim 1 wherein the heated gas stream has temperature of at least 93° C. (200° F.).

9. The process of claim 1 further comprising measuring the oxygen concentration of the heated gas stream, comparing the measured oxygen concentration against a set point oxygen concentration and adjusting the flow rate of fuel to be contacted with air based on the comparison.

10. A process for regenerating coked catalyst comprising:
contacting coked catalyst with oxygen in a first chamber of a regenerator to combust coke from said coked catalyst to provide regenerated catalyst and a flue gas stream;
passing said regenerated catalyst and said flue gas stream from said first chamber to a second chamber of said regenerator; and
distributing a heated gas stream to the second chamber separately from said flue gas stream having between about 0.001 and about 5 wt % oxygen and less than about 10 wppm sulfur oxides.

11. The process of claim 10 further comprising operating said first chamber with to insufficient oxygen in order to promote partial burn conditions.

12. The process of claim 10 further comprising distributing said heated gas stream to fluidize regenerated catalyst in said second chamber.

13. The process of claim 10 further comprising cooling said heated gas stream before it is distributed to said second chamber.

14. The process of claim 10 wherein said heated gas stream comprises no more than 2 wt % oxygen.

15. The process of claim 10 wherein the heated gas stream has temperature of at least 93° C. (200° F.).

Assignees

• Uop Llc

Inventors

• Walker Patrick D

Classifications

• B01J38/12 Primary

  Treating with free oxygen-containing gas · CPC title

• B01J38/32 Primary

  Indirectly heating or cooling material within regeneration zone or prior to entry into regeneration zone · CPC title

• B01D53/50

  Sulfur oxides (B01D53/60 takes precedence) · CPC title

• C10G2300/708

  Coking aspect, coke content and composition of deposits · CPC title

• B01J8/26

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