System for gas-solid separation and for stripping for fluidized-bed catalytic cracking units

A device for separating and stripping a gaseous mixture and a particle flow, comprising a jacket (50), divided into a number of separation chambers (2) and a number of pre-stripping chambers (3) that are distributed in a vault and in an alternating fashion around a central reactor (1), which has an essentially vertical and elongated shape, closed by an upper section (15), and in which the gaseous mixture and the flow of particles to be separated circulates,

• Each separation chamber (2), comprising in its upper portion an inlet opening (2) that communicates with the reactor (1) and with a centrifuging zone (23) that makes it possible to separate the particles of the gaseous mixture by means of a deflector (4), whereby the centrifuging zone (23) is defined for rotation in an essentially vertical plane of the gaseous mixture and particles according to an angle of at most 180 degrees, and
• Each separation chamber (2) comprising an outside wall (21-18-27), an inside wall that is merged with the outside wall of reactor (1), and two essentially vertical lateral walls (24) that are also the lateral walls of the pre-stripping chambers (3), at least one of the lateral walls (24) of each separation chamber (2) comprising a first lateral communication (5), located below the inlet opening (20) for bringing the gaseous mixture to an adjacent pre-stripping chamber (3),
• Each separation chamber (2) also comprising, in its lower portion (27), a second opening (6) that makes possible an essentially axial particle outlet located below the first lateral communication (5) of the outlet of the gaseous mixture, the second particle outlet opening (6) communicating below separation chambers (2) with a stripping zone (30) that contains at least one primary stripping means (11),
• The jacket (50) also comprising a pipe (14) for evacuating the mixture that contains the gaseous effluents that are obtained from pre-stripping chambers (3), located essentially in the shaft of the reactor (1) and connected, to said pre-stripping chambers (3) by the upper openings (8) and to at least one secondary separator (16) making it possible to separate the solid particles that are contained in a gaseous effluent from the evacuation pipe (14), whereby said secondary separator (16) comprises an outlet (9) for gaseous effluents, and a particle outlet (17) that dips into the stripping zone (30), said stripping zone (30) communicating with said pipe (14) for evacuation of the gas-solid mixture, via the lower openings (7) of the pre-stripping chambers (3), Each pre-stripping chamber (3) having oblique walls (19) fixed to lateral walls (24) and to the outside wall (22) of the jacket (50), the difference of thermal expansion between the reactor (1) and the separation chambers (2) forming a first assembly, and, the pre-stripping chambers (3) forming a second assembly, the two assemblies being supported by a gap which allows for the difference of thermal expansion.