Fluidized bed combustion

Claim 1

A fluidized bed combustion with a tuyere bottom for the admission of combustion and carrier ari, as well as a fuel feed entering a combustion chamber from below, with devices for the separation of solid particles borne by fluid gases and for their feedback into the fluidized bed, comprising: a deflection device with a separation chamber placed above the fluidized bed, within a flue gas current, the total deflection of the gases being approximately 360° C., wherein the fluid device has been configured with a first flow cross-section and with a second cross-section, wherein further the first flow cross-section has been placed at an angle of greater than 45 in relation to an incoming flue gas current and the second cross-section is essentially orthogonal to the first flow cross-section, wherein an output of the first flow cross-section and an input of the second flow cross-section are connected via the separation chamber wherein the first and second flow cross-sections are both subdivided into subchannels arranged parallel to a flow direction and wherein the subchannel of the first flow cross-section and the subchannel of the second flow cross-section are configured next to one another in an alternating manner, wherein the deflection of the flue gas flow within the sepration chamber is approximately 270°; a fuel feed configured as a fluidized bed channel and placed upstream from the combustion chamber, with its own tuyere bottom; a feed line providing a mixture of fuel and cooled bed material; and a feedback of the solid particles taking place from the separation chamber into the feed line.