Pulverized coal-fired boiler and pulverized coal burning method

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

Patent

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Details

F23L 9/02 (2006.01) F23C 99/00 (2006.01) F23L 3/00 (2006.01)

Patent

CA 2636631

A pulverized coal-fired boiler which can reduce both NOx and CO by supplying air efficiently to the central portion of a furnace and to the vicinity of the furnace wall thereby accelerating mixing with combustion gas. A main after air port is arranged to jet air with a momentum large enough for the air to reach the central portion of a furnace whereas a sub-after-air-port is arranged to jet air with a small momentum to the vicinity of the furnace wall, characterized in that the center of cross-section of the sub-after-air-port falls within a range of 1-5 times the diameter of the main after-air-port from the center of cross-section thereof. A pulverized coal-fired boiler which can reduce both NOx and CO by supplying air efficiently to the central portion of the furnace and to the vicinity of the furnace wall thereby accelerating mixing with combustion gas can thereby be provided.

La présente invention concerne une chaudière à charbon pulvérisé qui peut réduire tant NOx que CO en fournissant de l'air de manière efficace à la partie centrale d'un four et à proximité de la paroi du four accélérant de ce fait le mélange avec le gaz de combustion. Un orifice d~air principal est disposé de façon à pulvériser de l~air avec une portée assez grande pour que l'air atteigne la partie centrale d'un four tandis qu'un orifice d~air secondaire est disposé de façon à pulvériser de l~air avec une petite portée pour atteindre la proximité de la paroi du four, caractérisé en ce que le centre de la coupe transversale de l~orifice d~air secondaire est dans la gamme de 1 à 5 fois le diamètre de l~orifice d~air principal à partir du centre de la coupe transversale de celui-ci. On peut ainsi proposer une chaudière à charbon pulvérisé qui peut réduire tant NOx que CO en fournissant de l'air de manière efficace à la partie centrale d'un four et à proximité de la paroi du four accélérant de ce fait le mélange avec le gaz de combustion.

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