A method for reducing nitrogen oxide emissions of a bubbling...

F - Mech Eng,Light,Heat,Weapons – 23 – C

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F23C 10/22 (2006.01) F23G 7/10 (2006.01) F23K 3/02 (2006.01)

Patent

CA 2597159

A method for reducing nitrogen oxide emissions of a bubbling fluidized bed boiler burning biofuel and an air distribution system for a bubbling fluidized bed boiler biofuel. A fluidized bed (2) is arranged in the lower part of a furnace (1) of the bubbling fluidized bed boiler, which is fluidized by means of fluidizing gas, which comprises at least primary air. Fuel is fed to the fluidized bed (2), which dries and pyrolizes into pyrolysis gas comprising volatile matter of fuel, which gas rises upwards in the furnace and burns there. Secondary air is supplied above the fluidized bed (2) from secondary air nozzles (6), and tertiary air is supplied above the secondary air nozzles (6). A part of primary air is supplied in connection with fuel feeding in such a manner that the fuel is forced substantially on the surface of the fluidized bed (2), thus pyrolizing entirely, and at least a part of the pyrolysis gases formed in the pyrolysis is burnt by means of primary air in such a manner that the air coefficient in relation to the volatile matter of fuel in the pyrolysis gases is in the substoichiometric area.

L~invention concerne un procédé destiné à réduire les émissions d'oxyde d'azote d'une chaudière à lit fluidisé bouillonnant brûlant un biocombustible et un système de distribution d'air pour un biocombustible destiné à une chaudière à lit fluidisé bouillonnant. Un lit fluidisé (2) est disposé dans la partie inférieure d'un four (1) de la chaudière à lit fluidisé bouillonnant, qui est fluidisé au moyen d~un gaz de fluidification, qui comprend au moins de l'air primaire. Le combustible est introduit dans le lit fluidisé (2), lequel sèche et pyrolyse en un gaz de pyrolyse comprenant une matière volatile du combustible, lequel gaz s~élève dans le four et brûle dans celui-ci. De l'air secondaire est introduit au-dessus du lit fluidisé (2) à partir des buses d'air secondaire (6), et de l'air tertiaire est introduit au-dessus des buses d'air secondaire (6). Une partie de l'air primaire est fournie en connexion avec l~alimentation en combustible de telle façon que le combustible soit sensiblement déposé de force sur la surface du lit fluidisé (2), étant donc entièrement pyrolysé, et au moins une partie des gaz de pyrolyse formés au cours de la pyrolyse est brûlée à l~aide de l'air primaire de telle façon que le coefficient d'air par rapport aux substances volatiles du combustible dans les gaz de pyrolyse soit dans la zone sous-stAEchiométrique.

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