Patent ID: 7240639

Claim:
A fluidized bed reactor ( 10 ), comprising: a furnace ( 16 ), having a bed of particulate material and a bottom ( 24 ) provided with nozzles ( 26 ) for fluidizing gas, said bottom limiting the furnace from the bottom; a heat exchange chamber ( 40 ) provided with heat exchange surfaces ( 48 ) for recovering heat from the particulate material; and a discharge channel ( 52 ) connected to the lower part of the heat exchange chamber for removing particulate material from the heat exchange chamber ( 40 ) to the furnace ( 16 ); characterized in that the fluidized bed reactor ( 10 ) comprises a substantially vertical auxiliary channel ( 62 ) for transferring particulate material from the heat exchange chamber ( 40 ) to the furnace ( 16 ) and from the furnace ( 16 ) to the heat exchange chamber ( 40 ), the lower part of the auxiliary channel ( 62 ) being provided with nozzles ( 68 ) for fluidizing gas and with a flow conduit ( 64 ) for connecting the auxiliary channel to the furnace ( 16 ), and the upper part of the auxiliary channel ( 62 ) being provided with a flow conduit ( 66 ) for connecting the auxiliary channel ( 62 ) to the heat exchange chamber ( 40 ).