Burner design for achieving higher rates of flue gas recirculation
AssigneeExxonMobil Chemical Patents Inc.
InventorsGeorge Stephens, David B. Spicer
Life of this patent
Estimating the term…
Abstract
A burner for use in furnaces such as in steam cracking. The burner includes a primary air chamber; a burner tube including (i) a downstream end, (ii) an upstream end in fluid communication with the primary air chamber, and (iii) a burner tip mounted on the downstream end of the burner tube and directed to a first opening in the furnace, so that combustion of fuel takes place downstream of the burner tip; at least one flue gas recirculation duct having a first end at a second opening in the furnace and a second end opening into the primary air chamber, the first end being spaced an effective distance from the first opening for minimizing entrainment of a burner flame into the second opening.
Claims28
A burner for use in a furnace, said burner being located within a first flame opening in the furnace, said burner comprising:
- (a) a primary air chamber;
- (b) a burner tube including (i) a downstream end, (ii) an upstream end in fluid communication with said primary air chamber, and (iii) a burner tip mounted on the downstream end of said burner tube and directed to the first flame opening in the furnace, so that combustion of fuel takes place downstream of said burner tip;
- (c) at least one flue gas recirculation duct having a first end at a second opening in the furnace and a second end opening into said primary air chamber, said first end being spaced an effective distance from said first opening for minimizing entrainment of a burner flame into said second opening;
- and
- (d) a wall extending into the furnace between said first flame opening and said first end of said flue gas recirculation duct to substantially lengthen a flow path therebetween and thereby provide a substantial barrier to flow.
A method for minimizing flame entrainment in an FGR duct of a burner, the burner being located within a first flame opening in a furnace, said method comprising the steps of:
- (a) providing a primary air chamber within the burner;
- (b) providing a burner tube within the burner, the burner tube including (i) a downstream end, (ii) an upstream end in fluid communication with the primary air chamber, and (iii) a burner tip mounted on the downstream end of the burner tube and directed to the first flame opening in the furnace, so that combustion of the fuel gas takes place downstream of the burner tip;
- (c) providing at least one flue gas recirculation duct having a first end at a second opening in the furnace and a second end opening into the primary air chamber, the first end being spaced an effective distance from the first opening for minimizing entrainment of a burner flame into the second opening;
- and
- (d) providing a wall extending into the furnace between the first flame opening and the first end of said flue gas recirculation duct to substantially lengthen a flow path therebetween and thereby provide a substantial barrier to flow.
Dependencies are inferred from the claim text.