Mixing device for mixing raw material and catalyst in fluid catalytic cracking device

Patent metadata

Field	Value
Publication number	US-9446368-B2
Application number	US-201414481112-A
Country	US
Kind code	B2
Filing date	Sep 9, 2014
Priority date	Apr 27, 2012
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A mixing device used in a fluidized catalytic cracking apparatus which mixes feed and a catalyst includes a cylindrical reaction container which supplies a catalyst in a vertical direction; a plurality of feed injection nozzles arranged along an outer circumference of the reaction container; and a catalyst flow regulator which is provided in the reaction container and regulates a flow of the catalyst in the vicinity of the feed injection nozzles. The catalyst flow regulator has no feed supply function and forms a catalyst moving bed having a hollow tubular shape which is coaxial with the reaction container in the vicinity of the feed injection nozzles. The catalyst flow regulator can effectively prevent backward flow of injected fuel. Although the mixing device has a simple structure, it has a high cracking rate and maintenance of the fluidized catalytic cracking apparatus can be performed easier.

First claim

What is claimed is:

1. A mixing device used in a fluidized catalytic cracking apparatus which mixes a feed and a catalyst, the device comprising:
a cylindrical reaction container configured to continuously supply the catalyst by allowing the catalyst to fall in a vertical direction;
a feed supply section configured to include a plurality of feed injection nozzles which are arranged along an outer circumference of the reaction container and through which the feed is supplied from an exterior of the reaction container to an interior of the reaction container; and
a catalyst flow regulator which is arranged in the reaction container and regulates a flow of the catalyst in the vicinity of the feed injection nozzles,
wherein the catalyst flow regulator has no feed supply function and is arranged to form a catalyst stream having a hollow tubular shape to be coaxial with the reaction container in the vicinity of the feed injection nozzles,
wherein on an assumption that an injection angle with respect to a horizontal plane of each of the feed injection nozzles is θ, the injection angle θ is in a range of from 30 to 60 degrees, and
wherein a tip of a lower portion of the catalyst flow regulator is arranged above an intersection point between an extended line of each of the feed injection nozzles and an axis of the reaction container.

2. The mixing device according to claim 1 , wherein a cross-sectional area of the catalyst flow regulator in a horizontal direction is 10% to 50% of a cross-sectional area of the reaction container in the horizontal direction.

3. The mixing device according to claim 1 , wherein the catalyst flow regulator, a reaction portion at which the feed and the catalyst react to each other, an inner wall of the reaction container, and the feed supply section are arranged in this order from a center of the cylindrical reaction container in a horizontal direction.

4. The mixing device according to claim 1 , wherein the catalyst flow regulator is formed of a refractory material having wear resistance.

5. The mixing device according to claim 1 , wherein the feed supply section has 3 to 12 feed injection nozzles.

6. The mixing device according to claim 5 , wherein the injection angle θ is in a range of from 40 to 50 degrees.

7. The mixing device according to claim 1 , wherein the catalyst flow regulator has a cylindrical structure.

8. The mixing device according to claim 1 , wherein the catalyst flow regulator is a disk-shaped porous plate which is provided so that an outer circumference of the porous plate is fixed to an inner wall surface of the reaction container and has a plurality of through holes therein at a portion other than a central portion.

9. The mixing device according to claim 1 , wherein particles of the catalyst include silica and alumina as major components.

10. The mixing device according to claim 1 , wherein a particle size of the catalyst is in a range of 1 to 400 μm.

11. The mixing device according to claim 1 , further comprising a distribution plate which is provided on an upstream side of the catalyst flow regulator to distribute the flow of the catalyst in the reaction container uniformly.

12. The mixing device according to claim 11 , wherein the distribution plate is formed of a refractory material having wear resistance.

13. A mixing device used in a fluidized catalytic cracking apparatus which mixes a feed and a catalyst, the device comprising:
a cylindrical reaction container configured to continuously supply the catalyst by allowing the catalyst to fall in a vertical direction;
a feed supply section configured to include a plurality of feed injection nozzles which are arranged along an outer circumference of the reaction container and through which the feed is supplied from an exterior of the reaction container to an interior of the reaction container; and
a catalyst flow regulator which is arranged in the reaction container and regulates a flow of the catalyst in the vicinity of the feed injection nozzles,
wherein the catalyst flow regulator has no feed supply function and is arranged to form a catalyst stream having a hollow tubular shape to be coaxial with the reaction container in the vicinity of the feed injection nozzles,
wherein on an assumption that an injection angle with respect to a horizontal plane of each of the feed injection nozzles is 0, the injection angle θ is in a range of from 30 to 60 degrees, and
wherein a tip of a lower portion of the catalyst flow regulator is arranged below a position shifted upward by a distance corresponding to D/4 (D is an inner diameter of the reaction container) from a position of a tip of each of the feed injection nozzles in a vertical direction.

14. A mixing device used in a fluidized catalytic cracking apparatus which mixes a feed and a catalyst, the device comprising:
a cylindrical reaction container configured to continuously supply the catalyst by allowing the catalyst to fall in a vertical direction;
a feed supply section configured to include a plurality of feed injection nozzles which are arranged along an outer circumference of the reaction container and through which the feed is supplied from an exterior of the reaction container to an interior of the reaction container; and
a catalyst flow regulator which is arranged in the reaction container and regulates a flow of the catalyst in the vicinity of the feed injection nozzles,
wherein the catalyst flow regulator has no feed supply function and is arranged to form a catalyst stream having a hollow tubular shape to be coaxial with the reaction container in the vicinity of the feed injection nozzles, and
wherein the catalyst flow regulator has a disk-shaped structure which is bonded to an inner wall surface of the reaction container via a support portion.

15. A mixing device used in a fluidized catalytic cracking apparatus which mixes a feed and a catalyst, the device comprising:
a cylindrical reaction container configured to continuously supply the catalyst by allowing the catalyst to fall in a vertical direction;
a feed supply section configured to include a plurality of feed injection nozzles which are arranged along an outer circumference of the reaction container and through which the feed is supplied from an exterior of the reaction container to an interior of the reaction container; and
a distribution plate supported by an inner wall of the reaction container,
a catalyst flow regulator which is arranged in the reaction container and is supported by the distribution plate and which regulates a flow of the catalyst in the vicinity of the feed injection nozzles,
wherein the catalyst flow regulator has no feed supply function and is arranged to form a catalyst stream having a hollow tubular shape to be coaxial with the reaction container in the vicinity of the feed injection nozzles.

Assignees

• Jx Nippon Oil & Energy Corp

Inventors

• Shimada Koji
• Saito Naoya

Classifications

• C10G11/18 Primary

  according to the "fluidised-bed" technique · CPC title

• B01J2208/00769

  Details of feeding or discharging · CPC title

• B01F5/048

  Operations & Transport · mapped topic

• B01J8/003

  in a downward flow · CPC title

• B01J8/085

  Feeding reactive fluids (for solid material, see B01J8/0015) · CPC title