Method and apparatus for operating a circulating fluidized...

F - Mech Eng,Light,Heat,Weapons – 23 – C

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F23C 10/10 (2006.01) B01J 8/18 (2006.01) B01J 8/26 (2006.01) B01J 8/38 (2006.01) F22B 31/00 (2006.01) F22B 31/08 (2006.01) F23C 9/00 (2006.01) F23C 11/02 (1995.01)

Patent

CA 2148920

In association with a circulating fluidized bed reactor, a bed of particles is estabished in the return duct (34) for recycling particles from the particle separator (14) to the combustion chamber (12). Inlet openings (50) extend from the bed of particles into the combustion chamber, and the height of the particle bed is maintained above the inlet openings at a sufficient distance to form a gas seal. The particles in the bed are fluidized, and also transporting nozzles (52, 54, 56, 58, 59) are arranged at different levels for transporting the particles from the bed through the inlet openings into the combustion chamber. Heat exchangers (38), e.g. superheaters, may be provided in the bed to recover heat from the particles.

La présente invention a pour objet un réacteur à lit fluidisé à circulation; un lit de particules est formé dans le conduit de reprise (34) pour le recyclage des particules entre le séparateur de particules (14) et la chambre de combustion (12). Des orifices d'admission (50) assurent la communication entre le lit de particules et la chambre de combustion et la hauteur du lit de particules est maintenu à un niveau supérieur à celui des orifices d'admission à une distance suffisante pour former un joint de gaz. Les particules contenues dans le lit sont fluidisées et des buses de transport (52, 54, 56, 58 et 59) sont disposées à différents niveaux pour transporter les particules à travers les orifices d'admission, du lit à la chambre de combustion. Des échangeurs de chaleur (38), des surchauffeurs, par exemple, peuvent être intégrés au lit pour récupérer la chaleur des particules.

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