Combustion – Process of combustion or burner operation – Burning waste gas – e.g. – furnace gas – etc.
Reexamination Certificate
2005-06-07
2005-06-07
Basichas, Alfred (Department: 3749)
Combustion
Process of combustion or burner operation
Burning waste gas, e.g., furnace gas, etc.
C431S009000
Reexamination Certificate
active
06902390
ABSTRACT:
An improved burner and a method for combusting fuel in burners used in furnaces such as those found in steam cracking. The burner includes a burner tube having a longitudinal axis and having a downstream end and an upstream end for receiving fuel gas and air, flue gas or mixtures thereof, a fuel orifice located adjacent the upstream end of the burner tube, for introducing fuel gas into the burner tube, a burner tip mounted on the downstream end of the burner tube and adjacent a first opening in the furnace, the burner tip having a plurality of main ports substantially aligned with said longitudinal axis of the burner tube, and a plurality of peripherally arranged side ports and an peripheral tile which peripherally surrounds the burner tip, leaving at least one gap between an outer periphery of the burner tip and the peripheral tile, the at least one gap effective for providing a portion of the air for combustion wherein the quantity of fuel gas discharged during combustion from the peripherally arranged side ports does not exceed 15% of the total fuel gas combusted. Reducing the quantity of the fuel gas discharged from the side ports during burner operation is effective to reduce NOxemissions during combustion over a similar burner utilizing a conventional burner tip design.
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Basichas Alfred
ExxonMobil Chemical Patents Inc.
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