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NOVEL GAS/SOLID SEPARATION SYSTEM FOR THE REGENERATORS OF FLUID CATALYTIC CRACKING UNITS

Andreux, Regis ; Gauthier, Thierry ; et al.
2010
Online Patent
Zugriff:
View record in USPTO Patent Applications (Volltext)

The present invention describes a novel gas/solid separation system that can be applied to any type of FCC unit regenerators. It consists of a device for separating solid particles contained in a gas stream coming from the regeneration zone of a fluid catalytic cracking (FCC) unit bounded by an inner envelope (3) of cylindrical shape centred about the vertical axis of the regeneration zone, and an outer envelope (1) that has one approximately horizontal wall (15), followed by one curvilinear wall (16), and one approximately vertical wall (17), the set of said walls (15, 16, 17) covering the inner envelope (3) and forming a set of separation chambers (2) radially distributed around the inner envelope (3) in which the gas/solid suspension to be separated circulates. This novel separation system makes it possible to obtain, at the same time, very good separation efficiency while minimizing the pressure drop and only requiring a single downstream cyclone stage.

Titel:
NOVEL GAS/SOLID SEPARATION SYSTEM FOR THE REGENERATORS OF FLUID CATALYTIC CRACKING UNITS
Autor/in / Beteiligte Person: Andreux, Regis ; Gauthier, Thierry ; Le Coz, Jean-Francois ; Leroy, Patrick ; Delsart, Olivier
Link:
Veröffentlichung: 2010
Medientyp: Patent
Sonstiges:
  • Nachgewiesen in: USPTO Patent Applications
  • Sprachen: English
  • Document Number: 20100175553
  • Publication Date: July 15, 2010
  • Appl. No: 12/519096
  • Application Filed: December 07, 2007
  • Assignees: I F P (Rueil Malmaison Cedex, FR)
  • Claim: 1- Device for separating solid particles contained in a gas stream coming from the regeneration zone of a fluid catalytic cracking (FCC) unit bounded by an inner envelope (3) of cylindrical shape centred about the vertical axis (11) of the regeneration zone (25), and an outer envelope (1) that has one approximately horizontal wall (15), one curvilinear wall (16), and one approximately vertical wall (17), the set of said walls (15, 16, 17) covering the inner envelope (3) and forming a set of separation chambers (2) radially distributed around the inner envelope (3) in which the gas/solid suspension to be separated circulates, each separation chamber (2) communicating, on the one hand, via the inlet sections (4) with the inner cylindrical envelope (3) and, on the other hand, via the outlet sections (5) with the lower part of the regeneration zone (25) and having at least one side outlet (6) located in the upper part of the side wall (22) of the separation chamber (2), said side outlet (6) being defined by the space between the portion of the vertical wall of the inner envelope (3) located immediately below the inlet section (4) and the intrados (26) corresponding to the curvilinear wall (16) of the outer envelope (1), said device comprises, in addition, baffles (7) located between two successive separation chambers (2), each baffle (7) being fixed to the wall of the inner cylindrical envelope (3), and the return legs (8) of the cyclones (21) forming the secondary separation stage, are inserted between the separation chambers (2), and are aligned in a circle having a diameter between the diameter of the inner cylindrical envelope (3) and the larger diameter of the outer envelope (1).
  • Claim: 2- Device according to claim 1, in which each baffle (7) has an upwardly pointing wing shape, the upper end of the wing being located at a level below the upper level of the side opening (16).
  • Claim: 3- Device according to claim 1, in which each baffle (7) has a lower inclined part fixed to the wall of the inner cylindrical envelope (3), the angle of inclination being between 15 and 30 degrees relative to the vertical.
  • Claim: 4- Device according to claim 1, in which each baffle (7) has an upper, approximately vertical part located at least 150 mm with respect to the vertical wall of the inner cylindrical envelope (3).
  • Claim: 5- Device according to claim 1 in which there are 2 or 4 separation chambers (2), baffles (7) and return legs (8) of the cyclones and they form an assembly that respects the symmetry about the vertical axis (11) of the regeneration zone (25).
  • Claim: 6- Device according to claim 1, in which the level of the dense fluidized bed located in the lower part of the regeneration zone (25) is at least one metre lower than the level of the outlet sections (5).
  • Claim: 7- Process for separating solid particles contained in a gas/solid suspension using the device according to claim 1, in which the circulation rate of the gas/solid suspension in the inlet sections (4) is between 5 m/s and 30 m/s, and preferably between 8 m/s and 20 m/s.
  • Claim: 8- Process for separating solid particles contained in a gas/solid suspension using the device according to claim 1, in which the mass flow rate ratio of the solid to the gas at the inlet sections (4) is between 2 and 40, and preferably between 4 and 25.
  • Claim: 9- Process for separating solid particles contained in a gas/solid suspension using the device according to claim 1, in which the gas outlet rate at the side openings (6) is between 5 and 30 m/s, and preferably between 5 m/s and 12 m/s.
  • Claim: 10- Process for separating solid particles contained in a gas/solid suspension using the device according to claim 1, in which the gas/solid suspension is introduced into the vertical pipe (18) where it flows with vertical ascending flow, then enters into the centrifuging zone (19) via the flow area (4) where it rotates around 180° so as to enable the disengagement of the gas, which is mainly discharged via the opening (6), the solid particles moving vertical downwards through the vertical descending zone (20) and being discharged towards the lower part of the regeneration chamber (25) via the outlet section (5).
  • Claim: 11- Process for separating solid particles contained in a gas/solid suspension using the device according to claim 1, in which the catalyst flow rate through the outlet section (5) is between 50 and 1500 kg/(m2.s), and preferably between 100 kg/(m2.s) and 500 kg/(m2.s).
  • Current U.S. Class: 95/271
  • Current International Class: 01

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