A fluid cooled combustion can, comprising: an internal core housed in an intermediate core; wherein the inteimediate core is housed in an external housing; wherein an outer surface of the intermediate core defines one or more ribs that together with an inside surface of the external housing define a cooling fluid circuit that is in fluid communication with a cooling fluid inlet and outlet.

A fluid cooled combustion can, comprising: an internal core housed in an intermediate core; wherein the inteimediate core is housed in an external housing; wherein an outer surface of the intermediate core defines one or more ribs that together with an inside surface of the external housing define a cooling fluid circuit that is in fluid communication with a cooling fluid inlet and outlet.

A rotary bottom ash regenerating (RBAR) system [100] comprises a cylindrical body [110] that receives ash [17] containing reactant particles [10] that are partially reacted limestone compounds having unreacted cores [13] from a furnace. Sensors [140] sense physical parameters within the cylindrical body [110]. A controller [170] receives the output of the sensors [140] and information indicating the amount of unreacted core [13] and causes a fluid actuator [135] to spray a proper amount of regeneration fluid regulator [135] from a plurality of spray nozzles [131] to different locations within the cylindrical body [110] to regulate the temperature and to cause the reactant particles [10] to have a require content of regeneration fluid. This causes the reactant particles [10] to be regenerated and reused. This results in a lower limestone costs and less overheating of ash handling systems.

A rotary bottom ash regenerating (RBAR) system [100] comprises a cylindrical body [110] that receives ash [17] containing reactant particles [10] that are partially reacted limestone compounds having unreacted cores [13] from a furnace. Sensors [140] sense physical parameters within the cylindrical body [110]. A controller [170] receives the output of the sensors [140] and information indicating the amount of unreacted core [13] and causes a fluid actuator [135] to spray a proper amount of regeneration fluid regulator [135] from a plurality of spray nozzles [131] to different locations within the cylindrical body [110] to regulate the temperature and to cause the reactant particles [10] to have a require content of regeneration fluid. This causes the reactant particles [10] to be regenerated and reused. This results in a lower limestone costs and less overheating of ash handling systems.

A system for capturing carbon dioxide CO.sub.2 by carbonation in a circulating fluidized bed (CFB) carbonation reactor wherein temperature profile is adjusted by recirculation of solid fractions of metal oxide MeO and metal carbonate MeCO.sub.3 to the CFB carbonation reactor.

A system for capturing carbon dioxide CO.sub.2 by carbonation in a circulating fluidized bed (CFB) carbonation reactor wherein temperature profile is adjusted by recirculation of solid fractions of metal oxide MeO and metal carbonate MeCO.sub.3 to the CFB carbonation reactor.

The present invention relates to a method for capturing carbon dioxide CO.sub.2 by carbonation in a circulating fluidized bed (CFB) carbonation reactor wherein temperature profile is adjusted by recirculation of solid fractions of metal oxide MeO and metal carbonate MeCO.sub.3 to the CFB carbonation reactor. Also a system recirculating the metal oxide MeO and metal carbonate MeCO.sub.3 is provided by the invention.

The present invention relates to a method for capturing carbon dioxide CO.sub.2 by carbonation in a circulating fluidized bed (CFB) carbonation reactor wherein temperature profile is adjusted by recirculation of solid fractions of metal oxide MeO and metal carbonate MeCO.sub.3 to the CFB carbonation reactor. Also a system recirculating the metal oxide MeO and metal carbonate MeCO.sub.3 is provided by the invention.