Low NO/sub x/ premix burner

Patent · Tue Dec 16 04:00:00 EST 1986

OSTI ID:6853925

Michelson, H D; Stumbar, J P

This patent describes a premixing burner for the combustion of fuel gas and air with reduced NO/sub x/ production, the burner having a primary air-fuel gas combustion assembly and a secondary air combustion assembly. The primary air-fuel gas combustion assembly comprises a burner tube and a burner tile spaced from and surrounding the downstream end of the tube, the burner tube having a mixer connected to an extension tube and a burner tip mounted on the downstream end of the extension tube. The mixer has inlets for fuel gas and primary air and is adapted to mix the fuel and primary air prior to combustion at predetermined ratios, the burner tip having ports for passage of the gas from the extension tube. The burner tube and burner tile are adapted to support and stabilize a substoichiometric initial flame resulting from the combustion of the gases passing through the burner tip, the initial flame having a base in the region formed by the burner tile and burner tip. The secondary air combustion assembly comprises multiple secondary air ports and secondary air inlet means therefor, the secondary air ports being spaced radially from the burner tile and circumferentially from each other. The radial spacing is a sufficient distance to permit secondary air streams from the ports to react with the flame of the premixed gas substantially downstream of the burner tip. The circumferential spacing between ports is a sufficient distance to permit furnace flue gas to re-circulate to the base of the initial flame in amounts at least sufficient to achieve lower temperatures in the initial flame and to move the secondary air streams away from the initial flame. The primary air-fuel gas ratios includes the range of about 25-65% of the stoichiometric air requirement of the fuel gas, the burner being adapted for a total air requirement of up to about 120 mol % of the stoichiometric air requirement of the fuel gas.

• Assignee: Exxon Research and Engineering Co., Florham Park, NJ
• Patent Number(s): US 4629413
• OSTI ID: 6853925
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
034000 -- Natural Gas-- Combustion
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR
AIR POLLUTION ABATEMENT
BURNERS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
FLAME PROPAGATION
FLAMES
FLUE GAS
FLUID FLOW
FLUIDS
FUEL GAS
FUEL-AIR RATIO
FUELS
FURNACES
GAS BURNERS
GAS FLOW
GAS FUELS
GASEOUS WASTES
GASES
INTAKE STRUCTURES
MECHANICAL STRUCTURES
MIXERS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
SPACE DEPENDENCE
STOICHIOMETRY
THERMOCHEMICAL PROCESSES
WASTES