Catalyst cooler for regenerated catalyst

Patent metadata

Field	Value
Publication number	US-2016169506-A1
Application number	US-201414566035-A
Country	US
Kind code	A1
Filing date	Dec 10, 2014
Priority date	Dec 10, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

A catalyst cooler for cooling regenerated catalyst in a regenerator associated with a fluid catalytic cracking unit. The catalyst cooler includes a first passage for transporting hot regenerated catalyst away from the regenerator and a second passage for returning cooled regenerated catalyst to the regenerator. The catalyst cooler also includes at least one heat exchanger. The second passage may be disposed within the first passage, or the first and second passage may each occupy a portion of a horizontal cross section of the catalyst cooler.

First claim

What is claimed is:

1 . A regenerator for regenerating spent catalyst particles, the regenerator comprising:
an inlet for spent catalyst particles; an outlet for regenerated catalyst particles; a gas distributor disposed below a bed of catalyst particles configured to supply combustion gas into the regenerator for combusting coke on the spent catalyst particles to provide the regenerated catalyst particles; and, a cooling zone for removing heat from regenerated catalyst, the cooling zone comprising a first passage for receiving regenerated catalyst, a second passage for returning cooled regenerated catalyst to the regenerator, and at least one heat exchanger for removing heat from the regenerated catalyst, wherein each heat exchanger in the cooling zone is disposed in at least one of the first passage and the second passage.

2 . The regenerator of claim 1 wherein the first passage comprises a conduit disposed within the second passage.

3 . The regenerator of claim 1 wherein the second passage comprises a conduit disposed within the first passage.

4 . The regenerator of claim 1 wherein the first passage and the second passage each comprise a portion of a single shell.

5 . The regenerator of claim 1 wherein each heat exchanger includes a longitudinal axis, and wherein the longitudinal axis of each heat exchanger is generally parallel to a flow path of the regenerated catalyst through the first passage.

6 . The regenerator of claim 1 , wherein the catalyst cooler further comprises an outlet for a lift gas.

7 . The regenerator of claim 6 , wherein the outlet is disposed within the second passage.

8 . The regenerator of claim 1 , wherein the second passage includes an arm with a plurality of outlets for dispensing cooled catalyst into the regenerator.

9 . The regenerator of claim 1 , wherein the least one heat exchanger comprises steam generators.

10 . A regenerator for regenerating spent catalyst particles, the regenerator comprising:
an inlet for spent catalyst particles; an outlet for regenerated catalyst particles; a gas distributor disposed below a bed of catalyst particles configured to supply combustion gas into the regenerator for combusting coke on the spent catalyst particles to provide the regenerated catalyst particles; and, a catalyst cooler disposed beneath the bed of catalyst particles, the catalyst cooler comprising a first passage for hot regenerated catalyst, at least one heat exchanger for removing heat from the hot regenerated catalyst to provide a cooled regenerated catalyst, and a second passage for passing the cooled regenerated catalyst to the bed of catalyst particles.

11 . The regenerator of claim 10 , wherein the catalyst cooler further comprises an inlet for lift gas configured to transport the cooled regenerated catalyst to the bed of catalyst particles.

12 . The regenerator of claim 10 , wherein the second passage includes an arm disposed in the bed of catalyst particles.

13 . The regenerator of claim 10 , wherein the second passage is disposed within the first passage so as to define an annulus.

14 . The regenerator of claim 13 wherein the at least one heat exchanger is disposed within the annulus.

15 . The regenerator of claim 10 wherein the second passage is disposed within the first passage, and the at least one heat exchanger is disposed within the first passage.

16 . The regenerator of claim 10 wherein the catalyst cooler has a circular horizontal cross-section, and the first passage and the second passage each comprise a portion of the of the circular horizontal cross-section separated by a baffle.

17 . The regenerator of claim 16 wherein the first passage and the second passage have differently sized horizontal cross sections.

18 . A process for cooling regenerated catalyst comprising:
passing spent catalyst to a regenerator, the regenerator including an air distributor disposed below a bed of catalyst; combusting coke on the spent catalyst to provide a regenerated catalyst; passing a regenerated catalyst from the bed of catalyst to a catalyst cooler via a first passage; removing heat from the regenerated catalyst via a heat exchanger to provide a cooled regenerated catalyst; and, passing the cooled regenerated catalyst to the bed of catalyst in a second passage, the second passage parallel to the first passage.

19 . The process of claim 18 further comprising:
passing the cooled regenerated catalyst from the catalyst cooler to the regenerator with a lift gas.

20 . The process of claim 19 wherein one of the first passage and the second passage is disposed within the other of the first passage and the second passage.

Assignees

• Uop Llc

Inventors

• Palmas Paolo
• Myers Daniel N

Classifications

• B01J38/30 Primary

  in gaseous suspension, e.g. fluidised bed · CPC title

• F23C13/00 Primary

  Apparatus in which combustion takes place in the presence of catalytic material (in a fluidised bed of catalytic particles F23C10/01; radiant gas burners using catalysis for flameless combustion F23D14/18) · CPC title

• F23C10/01

  in a fluidised bed of catalytic particles · CPC title

• B01J38/12

  Treating with free oxygen-containing gas · CPC title

• B01J8/388

  externally, i.e. the particles leaving the vessel and subsequently re-entering it · CPC title