Large diameter mid-zone air separation cone for expanding irz

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

Patent

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Details

F23D 14/58 (2006.01) F23D 14/84 (2006.01)

Patent

CA 2590096

A large diameter mid-zone air separation cone is provided for decreasing NOx during burner operation by expanding the internal recirculation zone (IRZ) at the burner exit. The mid-zone air separation cone has a short cylindrical leading edge that fits in the outer air zone of a burner. The mid-zone air separation cone splits the outer air zone secondary air flow into two equal or unequal streams depending on the position of the air separation cone with respect to the outer air zone, and deflects a portion of the secondary air flow radially outward. Since the radial position of the air separation cone is farther from the burner centerline, the IRZ size is expanded and NOx emissions are minimized.

La présente invention concerne un cône de séparation d'air à mi-zone de grand diamètre visant à réduire les émissions de NOx durant le fonctionnement du brûleur par l'agrandissement de la zone de recirculation interne à la sortie du brûleur. Le cône de séparation d'air mi-zone comporte un court front d'attaque cylindrique qui s'engage dans la zone d'air externe d'un brûleur. Le cône de séparation d'air à mi-zone divise le flux d'air secondaire de la zone d'air externe en deux courants égaux ou inégaux, selon la position du cône de séparation d'air par rapport à la zone d'air externe, et dévie une partie du flux d'air secondaire radialement à l'extérieur. Étant donnée que la position radiale du cône de séparation d'air est éloignée de la ligne médiane du brûleur, la zone de recirculation interne est agrandie et les émissions de NOx sont réduites.

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