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Pub. No.:    WO/2015/043946    International Application No.:    PCT/EP2014/069249
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Thu Sep 11 01:59:59 CEST 2014
IPC: F23C 10/04
Applicants: FRODENO, Christa
Inventors: KADEN, Michael
The invention relates to a fluidized-bed furnace comprising a combustion fluidized bed (6a), to which the fuels to be fired are fed, and comprising a heat-exchanger fluidized bed (6b), to which immersion heating surfaces (17) are assigned. A heat discharge from the combustion fluidized bed (6a) is produced by bed material being passed from the combustion fluidized bed (6a) to the heat-exchanger fluidized bed (6b). A return unit is provided, by means of which a continuous, controllable material circulation is set up between the combustion fluidized bed and the heat-exchanger fluidized bed. The return unit may be formed as a tube structure or a greatly expanded fluidized bed. Multiple systems can be combined to form larger units.