F - Mech Eng,Light,Heat,Weapons – 23 – D
Patent
F - Mech Eng,Light,Heat,Weapons
23
D
F23D 14/06 (2006.01) F23C 6/04 (2006.01) F23C 9/00 (2006.01) F23D 14/22 (2006.01) F23D 14/46 (2006.01)
Patent
CA 2117286
A low NOx burner (2) includes a primary air and fuel discharge assembly which, in turn, includes a burner plate (6) having a plurality of slots (32) from which fuel gas jets and combustion air are discharged. The slots are arranged such that the width of the recirculation zones between adjacent slots substantially varies between the central region of the burner plate and its perimeter. With this construction, the local ignition patterns vary such that local oscillations of flame front occur at different frequencies so that vibrations are greatly dampened and resonance problems in the furnace minimized or eliminated. In applications where high excess air is not desirable, such as boiler applications, the burner is modified by providing a secondary fuel and flue gas injection assembly (80) to form a two stage burner (2'). In the preferred embodiment, the secondary injection assembly includes a plurality of discrete fuel and flue gas injection tubes (82, 94) arranged around the primary air and fuel gas discharge assembly (50). The secondary fuel and flue gases are directed radially inward and downstream from the burner plate so that they mix with the combustion air entering through the burner plate slots (32) in a secondary combustion zone. The resulting delay in the combustion of the secondary fuel gas and the need for heating the flue gas lowers the overall combustion temperature, which in turn reduces the NOx formation in the second or downstream combustion zone.
Lifshits Vladimir
Londerville Steve B.
Coen Company Inc.
Fetherstonhaugh & Co.
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