FLUID CATALYTIC CRACKING FEED INJECTOR

Abstract

A feed injector may have a body with an outer wall and an inner wall, with a first channel formed between the outer and inner walls. The first channel is configured to receive an atomizing gas. Additionally, the inner wall may form a second channel, which is configured to receive a liquid. The first and second channels are separated by the inner wall. Furthermore, a mixing chamber may be provided at one outlet of the first channel and one outlet of the second channel. The atomizing gas from the first channel and the liquid from the second channel collide and / or mix together in the mixing chamber to form liquid droplets and a mixture of the atomizing gas and the liquid. Additionally, a flow cone may have one end in the second channel and one end in the mixing chamber.

Claims

1. A feed injector, comprising: a body having an outer wall and an inner wall; a first conduit formed between the outer wall and the inner wall, the first conduit being configured to receive an atomizing gas; a second conduit formed by the inner wall, the second conduit being configured to receive a liquid, wherein the first conduit and the second conduit are separated by the inner wall; a mixing chamber at an outlet of the first conduit and an outlet of the second conduit, wherein the atomizing gas from the first conduit and the liquid from the second conduit strike and / or mix together in the mixing chamber to form liquid droplets and a mixture of the atomizing gas and the liquid; a flow cone having a first end in the second conduit and a second end in the mixing chamber;an annular path between the inner wall of the second conduit and an outer surface of the flow cone forms a liquid path to the outlet of the second conduit, wherein the outlet of the second conduit is formed by a space between one end of the inner wall and the second end of the flow cone, ML / t / zuzz / uoa ÓUO wherein a protrusion at the second end of the flow cone forms an angle from a central axis of the feed injector of 0 to 90 degrees; and a discharge channel at one end of the mixing chamber opposite the flow cone.

2. The feed injector of claim 1, further comprising a plurality of vanes in a portion of the outer wall of the flow cone.

3. The feed injector of claim 2, wherein the plurality of vanes is configured to change the direction of the liquid in the liquid path.

4. The feed injector of claim 1, further comprising one or more impact plates extending from the outer wall towards the central axis within the mixing chamber.

5. The feed injector of claim 4, wherein one or more walls form an angle with respect to the outer wall, and the angle is equal to the angle of space.

6. The feed injector of claim 1, wherein the outer surface of the flow cone is inclined so that the liquid path is progressively reduced from the first end of the flow cone to the second end of the flow cone.

7. The feed injector of claim 1, wherein the angle of the protrusion is in the range of 30 to 90 degrees. MA / t / zuzz / uoyjuo 8. The feed injector of claim 1, wherein the angle of the protrusion is from 45 to 75 degrees.

9. The feed injector of claim 1, wherein the atomizing gas is vapor.

10. The feed injector of claim 1, wherein the liquid is a hydrocarbon.

11. The feed injector of claim 1, further comprising a second conduit inlet arranged at an end opposite the discharge channel.

12. The feed injector of claim 11, further comprising a first conduit inlet provided between the second conduit inlet and the discharge channel.

13. The feed injector of claim 12, wherein the inlet of the first conduit is perpendicular to the central axis and the inlet of the second conduit is parallel to the central axis.

14. The feed injector of claim 1, wherein the outer wall, the inner wall, the first conduit and the second conduit are coaxial to the central axis.

15. The feed injector of claim 1, wherein the outlet of the first conduit is inclined to form an angle of attack for the atomizing gas between 0 and 90 degrees.

16. A fluid catalytic cracking unit, comprising: a vertically arranged upstream reactor; a fluidically coupled regenerator configured to provide a catalyst or hot particles to the vertically arranged upstream reactor; one or more feed injectors arranged in the vertically arranged upstream reactor, the feed injectors comprising: a body having an outer wall and an inner wall; a first conduit formed between the outer wall and the inner wall, the first conduit configured to receive an atomizing gas; a second conduit formed by the inner wall, the second conduit configured to receive a liquid feed, wherein the first conduit and the second conduit are separated by the inner wall;a mixing chamber at an outlet of the first conduit and an outlet of the second conduit, wherein the atomizing gas from the first conduit and the liquid from the second conduit are mixed together in the mixing chamber to form liquid droplets and a mixture of the atomizing gas and the liquid; a flow cone having a first end in the second conduit and a second end in the mixing chamber; an annular path between the inner wall of the second conduit and an outer surface of the flow cone forming a liquid path at the outlet of the second conduit, wherein the outlet of the second conduit is formed by a space between an end of the inner wall and the second end of the flow cone, wherein a protrusion at the second end of the flow cone forms an angle from a central axis of the feed injector according to an angle of 0 to 90 degrees;and a discharge channel at one end of the mixing chamber opposite the flow cone, in which the liquid droplets and the mixture of atomizing gas and liquid enter the vertically arranged upstream reactor through the discharge channel of one or more feed injectors.; 17. The fluid catalytic cracking unit of claim 16, wherein one or more feed injectors are arranged close to the bottom of the vertically arranged upstream reactor.

18. A method comprising: flowing an atomizing gas through a first conduit of a feed injector; flowing a liquid through a second conduit of the feed injector, wherein the first conduit and the second conduit are separated by a wall within the feed injector; directing the liquid through a liquid path formed by an annular path between the wall and an outer surface of a flow cone within the feed injector, wherein the liquid is displaced from a first end of the flow cone in the second conduit to a second end of the flow cone in a mixing chamber of the feed injector;The liquid outlet to the mixing chamber through an outlet of the second conduit forms a space between one end of the wall and the second end of the flow cone; the liquid is distributed in the mixing chamber with a protrusion at the second end of the flow cone at an angle from a central axis of the feed injector at an angle of 0 to 90 degrees; the atomizing gas is brought out to the mixing chamber through an outlet of the first conduit; the liquid from the second conduit and the atomizing gas from the first conduit are combined in the mixing chamber to form liquid droplets, resulting in a mixture of the atomizing gas and the liquid droplets; and the mixture of atomizing gas and liquid droplets is discharged through a discharge channel of the feed injector at one end of the mixing chamber opposite the flow cone.

19. The method of claim 18, further comprising changing the direction of the liquid flow in the liquid path with a plurality of paddles on a portion of the outer surface of the flow cone.

20. The method of claim 18, further comprising premixing a portion of the atomizing gas with the liquid within the second conduit upstream of the flow cone.

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