Patent EA-000664-B1 (EA)
Title: Circulating fluidized bed apparatus for chemical and physical processes
Inventor: RUOTTU SEPPO
IPC: B01J8/26
Filed: 1997-09-01
Abstract: 1. An apparatus for carrying out physical and chemical processes comprising two separate unit processes using a particulate matter medium, wherein the second unit process serves for regeneration of the particulate matter contaminated in the first unit process, said apparatus comprising a first reactor (1-3) for carrying out the first unit reaction, a second reactor (4-6) for carrying out the second unit reaction, adapted between the first reactor (1-3) and the second reactor (4-6), a first transfer channel (20) serving for the transfer of contaminated particulate matter from the first reactor to the second, and adapted between the second reactor (4-6) and the first reactor (1-3), a second transfer channel (29) serving for the transfer of regenerated particulate matter from the second reactor to the first, characterized in that the first reactor (1-3) comprises a circulating fluidized-bed reactor with a reaction space of an axially annular cross section, the second reactor (4-6) comprises a circulating fluidized-bed reactor surrounding the first reactor in a symmetrically concentric fashion,  whereby also the second reactor has a reaction space of an axially annular cross section, and said reactors are equipped with a gas and solids separating means formed by a multi-inlet cyclone (14, 17; 25, 26). arranged in the upper portion of the reaction space symmetrically in an axial direction. 2. An apparatus as defined in claim 1, characterized in that the reaction space of said first reactor (1-3) and/or said second reactor (4-6) comprises an intershell riser space formed between two concentrically located cylindrical and/or conical envelope surfaces. 3. An apparatus as defined in claim l or 2, characterized in that said reaction space is divided by partition baffles into parallel flow segments. 4. An apparatus as defined in claim 3, characterized in that said parallel flow segments are formed by spanning between said two concentrically mounted cylindrical envelope surfaces baffle plates which are aligned parallel to the longitudinal axis of the reaction space. 5. An apparatus as defined in claim 3, characterized in that the reaction space of essentially axially annular cross section is formed by parallel reactor tubes equidistantly spaced in a circular fashion. 6. An apparatus as defined in claim l or 2, characterized in that between said two concentrically mounted cylindrical envelope surfaces are spanned baffle plates running in a spiralling manner along the longitudinal axis of the reactor riser. 7. An apparatus as defined in any of foregoing claims, characterized in that said first reactor (1-3) and/or said second reactor (4-6) have an at least essentially upright longitudinal axis. 8. An apparatus as defined in any of foregoing claims, characterized in that said first reactor (1-3) and/or said second reactor (4-6) have a riser flow cross section varying as a function of the riser height. 9. An apparatus as defined in claim 1, characterized in that the vanes (14; 25) of the cyclone are adapted in a circularly louvered fashion about the perimeter of the cyclone chamber (17; 26), partially or entirely inside the riser channel, so as to act as a louver capable of forming a plurality of parallel inlet channels for the entering gas flow. 10. A reactor as defined in any of claims 1-9, characterized in that said first solids transfer channel (20) comprises a channel of axially annular cross section formed by the intershell riser space remaining between two cylindrical or partially conical envelope surfaces (1, 21).