Method and apparatus for altering the firing pattern of an exist

Details Method and apparatus for altering the firing pattern of an exist Method and apparatus for altering the firing pattern of an exist

1994-01-27

1995-05-23

Dority, Carroll B.

Combustion

Fuel disperser installed in furnace

Spaced fuel dispersing orifices within furnace

110263, 110265, F23C 508

Patent

active

054175640

ABSTRACT:
A new and improved method and apparatus for altering the firing pattern of an existing furnace of the type including at least one pair of vertically spaced apart burners mounted on a wall of the furnace and supplied with secondary air from a common windbox. The method involves cutting a rectangular panel from the furnace wall around a first burner wherein the burner is located asymmetrically toward a first panel end and spaced farther away from a vertically opposite second end of the panel. The cut-out panel is then reversed in orientation from end to end so that the first burner is then spaced farther apart at a greater distance from a second burner. The panel is reinstalled in the furnace wall in reverse orientation thereby providing a greater spacing or staging distance between the first and second burners producing a reduced level of NO.sub.x when the burners are fired. The increased spacing distance between the burners, the inclusion of new interstage air ports on the panels, and the addition of new burners with unique secondary air swirl orientation results in greatly improved lower NO.sub.X levels in a retrofit of an existing furnace.

REFERENCES:
patent: 4245980 (1981-01-01), Reed et al.
patent: 4347052 (1982-08-01), Reed et al.
patent: 4907962 (1990-03-01), Azuhata et al.
patent: 5067419 (1991-11-01), Kobayashi et al.
patent: 5205226 (1993-04-01), Kitto et al.
patent: 5231937 (1993-08-01), Kobayashi et al.

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