Mixing device situated above the distribution zone

Patent metadata

Field	Value
Publication number	US-10464035-B2
Application number	US-201916293730-A
Country	US
Kind code	B2
Filing date	Mar 6, 2019
Priority date	Mar 7, 2018
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

Device for mixing and distributing fluids for a downflow catalytic reactor, comprising:
a collecting zone (A) comprising a collecting means ( 5 ); a substantially vertical collecting pipe and at least one injection means ( 8 ) opening into said collecting pipe; a mixing zone (B) comprising a fluid mixing chamber ( 15 ) of length L 1 , said mixing zone ( 15 ) comprising a first end in communication with said collecting pipe and a second end in communication with a fluid exchange chamber ( 16 ) of length L 2 , situated beneath said mixing chamber ( 15 ), the length L 2 of said exchange chamber ( 16 ) being strictly greater than the length L 1 of said mixing chamber ( 15 ); a distribution zone (C), situated beneath the mixing zone (B), comprising a distribution plate ( 12 ) that carries a plurality of chimneys ( 13 ), and a plurality of horizontal panels ( 33 ), situated above or on the chimneys ( 13 ).

First claim

The invention claimed is:

1. Device for mixing and distributing fluids for a downflow catalytic reactor, said device comprising:
at least one collecting zone (A) comprising at least one collecting means ( 5 );
at least one substantially vertical collecting pipe ( 7 ) that is able to receive a reaction fluid collected by said collecting means ( 5 ) and at least one injection means ( 8 ) opening into said collecting pipe ( 7 ) in order to inject a quench fluid;
at least one mixing zone (B), situated downstream of said collecting pipe ( 7 ) in the direction of flow of the fluids, said mixing zone (B) comprising at least one fluid mixing chamber ( 15 ) of length L 1 , said mixing zone ( 15 ) comprising a first end in communication with said collecting pipe ( 7 ) and a second end in communication with a fluid exchange chamber ( 16 ) of length L 2 , situated beneath said mixing chamber ( 15 ), the length L 2 of said exchange chamber ( 16 ) being strictly greater than the length L 1 of said mixing chamber ( 15 ) so as to create a ceiling ( 30 ) on said exchange chamber ( 16 ), said ceiling ( 30 ) comprising at least one opening ( 31 ) that allows the fluids to pass from said exchange chamber ( 16 ) to a distribution zone (C);
at least one distribution zone (C), situated beneath the mixing zone (B), downstream of said mixing zone (B) in the direction of flow of the fluids, said distribution zone (C) comprising a distribution plate ( 12 ) that carries a plurality of chimneys ( 13 ) and a plurality of horizontal panels ( 33 ), situated beneath the opening ( 31 ) in the ceiling ( 30 ) of the exchange chamber ( 16 ) but above the chimneys ( 13 ) or on the chimneys ( 13 ) of the distribution plate ( 12 ) of the distribution zone (C).

2. Device according to claim 1 , characterized in that the ratio between the length L 1 of the mixing chamber ( 15 ) and the length L 2 of the exchange chamber ( 16 ) is between 0.1 and 0.9.

3. Device according to claim 1 , characterized in that the percentage of surface area taken up by the opening(s) ( 31 ) is between 20 and 100% relative to the total surface area of the ceiling ( 30 ).

4. Device according to claim 3 , characterized in that the percentage of surface area taken up by the opening(s) ( 31 ) is equal to 100% of the total surface area of the ceiling ( 30 ).

5. Device according to claim 1 , characterized in that said horizontal panels ( 33 ) are situated at a height of at most 100 mm above the chimneys ( 13 ) of the distribution plate ( 12 ).

6. Device according to claim 1 , characterized in that said horizontal panels ( 33 ) are situated on the chimneys ( 13 ) of the distribution plate ( 12 ).

7. Device according to claim 1 , characterized in that the surface area of the cross section taken up by said horizontal panels ( 33 ) is in the range from 2 to 95% of the surface area of the cross section of the distribution zone (C).

8. Device according to claim 1 , characterized in that said horizontal panels ( 33 ) are spaced apart from one another by a distance of between 1 and 50 mm.

9. Device according to claim 1 , characterized in that said mixing zone (B) is off-center with respect to the central axis of the distribution zone (C), forming two zones (Z 1 ) and (Z 2 ) on the distribution plate ( 12 ), the ratio R of which defined as the relationship between the surface area of the zone (Z 1 ) and the zone (Z 2 ) is between 0 and 1, not including the values 0 and 1.

10. Device according to claim 1 , characterized in that the mixing chamber ( 15 ) comprises a bottom ( 23 ) having an end edge ( 27 ) that has a beveled shape and forms an angle α of between 20° and 70° with the longitudinal axis XX′ of the mixing chamber ( 15 ).

11. Device according to claim 1 , characterized in that the injection means ( 8 ) is supplemented by a nozzle that opens directly into said collecting pipe ( 7 ), said nozzle consisting of a tube comprising at least one orifice that opens into said collecting pipe ( 7 ).

12. Device according to claim 1 , characterized in that said exchange chamber ( 16 ) also comprises, on its lateral walls ( 20 ), a plurality of lateral passage sections ( 17 ) suitable for the passage of the fluids from said exchange chamber ( 16 ) to said distribution zone (C).

13. Device according to claim 12 , characterized in that it also comprises at least one lateral deflector ( 32 ) situated in said distribution zone (C) opposite at least one lateral passage section ( 17 ).

14. Device according to claim 1 , characterized in that the volume ratio between said mixing chamber ( 15 ) and said exchange chamber ( 16 ) is between 5 and 60%.

15. Downflow catalytic reactor having a chamber ( 1 ) containing at least two fixed catalyst beds ( 2 , 14 ) separated by an intermediate zone having a device for mixing and distributing fluids according to claim 1 .

Assignees

• Ifp Energies Now

Inventors

• Augier Frederic
• Beard Philippe
• Plais Cecile

Classifications

• B01J2208/00929

  Provided with baffles · CPC title

• B01J2208/0092

  Perforated plates · CPC title

• B01J8/0453 Primary

  the beds being superimposed one above the other · CPC title

• B01J8/0285

  Heating or cooling the reactor (for tubular reactors in furnaces B01J8/062) · CPC title

• B01J8/0242

  the fluid flow within the bed being predominantly vertical · CPC title