Premix furnace and methods of mixing air and fuel and improving combustion stability
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United States of America Patent
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May 1, 2012
Grant Date -
Dec 9, 2010
app pub date -
Jun 3, 2010
filing date -
Jun 3, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Premix furnace for heating an occupied space while producing lower NOx emissions and methods of mixing air and fuel delivered to a premix burner and of improving combustion stability. A mixing device may be located within an inlet tube, may have a flat surface that is perpendicular to the direction of fuel flow, or may have two surfaces held at substantially opposite angles to induce swirl. A mixing device may be attached to the fuel injector, may be made from a piece of sheet metal, and may have bends and a hole for attachment to the fuel injector. A fluidic diode in the inlet tube may improve combustion stability and may include a hollow frustum or a frustoconical portion, a cylinder concentric with the inlet tube, or a combination thereof. Some embodiments include refractory insulation lining the combustion chamber or may adjust for elevation or fuel characteristics.
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