Circulating fluidized bed apparatus

A circulating fluidized bed apparatus, comprising

• a) a combustion chamber (CC) providing a bottom (GB), which is gas-permeable, at its lower end (LE), to allow development of a fluidized bed (FB) of particulate material above said bottom (GB), and at least one outlet port (OP) at its upper end (UE) to transfer a mixture of gas and solids from said combustion chamber (CC) via said outlet port (OP) into at least one subsequent separator (SP), wherein the separator (SP) is designed
• b) to allow at least part of said solids, separated from the gas, to pass on to at least one return duct (RD) and from there back into the combustion chamber (CC) or to pass on to at least one solids heat exchanger (SHE) and from there via corresponding recirculation means (RM) back into the combustion chamber (CC), or both, and
• c) to allow at least part of the gas, separated from the solids, to pass on to at least one subsequent treatment unit for said gas,
• wherein
• d) the combustion chamber (CC) is ring-shaped, comprising an inner wall (IW) and an outer wall (OW), arranged at a distance to each other in a radial direction of the combustion chamber (CC), and at least two intermediate walls (SW), which extend between the inner wall (IW) and the outer wall (OW) and in spaced relationship in a circumferential direction of the combustion chamber (CC), thereby subdividing the combustion chamber (CC) into a corresponding number of sections (CO), arranged adjacent to each other in the circumferential direction of the combustion chamber (CC).