Methods and apparatus for burning fuel with low NO.sub.x formation
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United States of America Patent
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Oct 13, 1992
Issued Date -
N/A
app pub date -
Feb 13, 1992
filing date -
Sep 7, 1990
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Abstract
Improved methods and burner apparatus are provided for discharging mixturesf fuel and air into furnace spaces wherein said mixtures are burned and flue gases having low NO.sub.x content are formed therefrom. The methods basically comprise discharging a first fuel mixture containing a portion of the fuel and flue gases from the furnace space into the furnace space whereby the mixture is burned in a primary reaction zone therein and flue gases having low NO.sub.x content are formed therefrom, and then discharging the remaining portion of the fuel into a secondary reaction zone wherein the remaining portion of fuel mixes with air and flue gases to form a second fuel mixture which is burned in the secondary reaction zone and additional flue gases having low NO.sub.x contents are formed therefrom.
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