Methods and apparatus for burning fuel with low No.sub.x formation

  • US 5,344,307 A
  • Filed: 08/25/1993
  • Issued: 09/06/1994
  • Est. Priority Date: 09/07/1990
  • Status: Expired due to Term
First Claim
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1. A method of discharging an at least substantially stoichiometric mixture of fuel and air from a burner into a furnace space wherein said mixture is burned and flue gases having low NOx content are formed therefrom comprising the steps of:

  • (a) discharging said air from said burner into said furnace space;

    (b) discharging a portion of said fuel in the form of a fuel jet in a passageway in said burner communicated with said furnace space whereby flue gases in said furnace space are drawn into said passageway with said fuel;

    (c) discharging said fuel and flue gases from said passageway into said furnace space whereby said fuel and flue gases mix with air and the mixture is burned in a primary reaction zone in said furnace space; and

    (d) discharging the remaining portion of said fuel into a secondary reaction zone in said furnace space whereby said fuel mixes with flue gases and air contained in said furnace space and is burned in said secondary reaction zone.

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