F - Mech Eng,Light,Heat,Weapons – 23 – C
Patent
F - Mech Eng,Light,Heat,Weapons
23
C
F23C 10/04 (2006.01) F23C 10/18 (2006.01) F23L 7/00 (2006.01)
Patent
CA 2753334
A method for reducing nitrogen oxide emissions in oxyfuel combustion, which method comprises supplying in a furnace (11) of a circulating fluidised bed boiler (10) at least one primary gas flow (15) and at least one secondary gas flow (16), which both have been produced by mixing oxygen and circulated flue gas together. The oxygen content of the primary gas (15) is adjusted such that a reducing zone (I) is formed at the bottom of the furnace, in which zone nitrogen oxides are reduced to nitrogen. The oxygen content of the secondary gas is adjusted such that above the reducing zone (I) is formed an oxidising zone (II), in which zone combustion is completed.
La présente invention porte sur un procédé permettant de réduire les émissions d'oxyde d'azote dans une combustion oxygaz. Ledit procédé consiste à fournir dans un four (11) d'une chaudière à lit fluidisé circulant (10) au moins un flux de gaz primaire (15) et au moins un flux de gaz secondaire (16) qui l'un et l'autre ont été produits en mélangeant ensemble l'oxygène et un gaz de combustion que l'on fait circuler. La teneur en oxygène du gaz primaire (15) est ajustée de telle sorte qu'une zone réductrice (I) soit formée au fond du four, dans laquelle les oxydes d'azote sont réduits en azote. La teneur en oxygène du gaz secondaire (15) est ajustée de telle sorte qu'une zone oxydante (I) soit formée au-dessus de la zone réductrice (I), la combustion dans la zone oxydante étant terminée.
Marks & Clerk
Metso Power Oy
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