F - Mech Eng,Light,Heat,Weapons – 23 – D
Patent
F - Mech Eng,Light,Heat,Weapons
23
D
F23D 14/60 (2006.01) F23C 7/00 (2006.01) F23D 14/24 (2006.01)
Patent
CA 2099112
A low NOx burner combustion system (10) which may be adjusted for optimum burn rates, temperature and oxygen levels. The burner (10) incorpo- rates a plurality of gas nozzles (38) which individually inspirate a portion of the combustion air and a spin vane dif- fuser (28) to rotate and mix the gases within the primary combustion zone (24). The diffuser (28) is axially adjus- table in order to vary the distance be- tween the vane and the first combustion zone (24) while the blades (30) of the diffuser (28) can be angularly adjusted to optimize the rotation and mix of the gases. Air for combustion is supplied through primary (20), secondary (42) and tertiary (54) passages to create dis- tinct combustion zones for complete combustion. The flow rate of the com- bustion air is controlled through a dam- per (26) in accordance with the burn characteristics. The angular and axial position of the diffuser and the damper control of combustion air can be auto- matically adjusted throughout the firing range of the burner (10) in response to demand levels. In order to convert existing burners to the efficient low NOx burner of the present invention the primary air chamber may be retrofit into the main burn- er chamber. In a further embodiment, flue gas is recirculated and mixed directly with combustion fuel prior to combustion for reduced emission levels.
Holman Boiler Works Inc.
Smart & Biggar
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