Methods and apparatus for burning fuel with low NOx formation
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United States of America Patent
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May 20, 2003
Grant Date -
Dec 26, 2002
app pub date -
Jun 25, 2001
filing date -
Jun 25, 2001
priority date (Note) -
Expired
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Abstract
Improved methods and apparatus for burning fuel with low NO.sub.x formation are provided. A method of the invention for discharging a mixture of fuel gas and air into a furnace wherein the mixture is burned and flue gases having a low NO.sub.x content are formed includes the following steps. A first portion of the fuel gas is mixed with a first portion of the air to form a primary fuel gas-air mixture. The primary fuel gas-air mixture is discharged into a primary burning zone in the furnace from at least one discharge location surrounded by a wall which extends into the furnace. A second portion of the fuel and a second portion of the air are mixed to form a secondary fuel gas-air mixture. The secondary fuel gas-air mixture is discharged into a secondary burning zone in the furnace from at least one discharge location adjacent to an exterior side of the wall. The secondary fuel gas-air mixture is discharged at a velocity whereby the secondary fuel gas-air mixture is not ignited and burned until the mixture spreads over an exterior side of the wall, mixes with flue gases in the furnace and flows beyond the wall.
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