Stoves and furnaces – Hot-air furnaces – Liquid or gaseous fuel
Patent
1995-10-12
1997-07-22
Jones, Larry
Stoves and furnaces
Hot-air furnaces
Liquid or gaseous fuel
126 99A, 126110R, 431353, 431352, F24H 300
Patent
active
056495293
ABSTRACT:
A fuel-fired, forced air, draft induced heating furnace is provided with NOx reduction apparatus associated with a plurality of combustor tubes forming a portion of its heat exchanger structure. In-shot type fuel burners are spaced apart from and face the open inlet ends of horizontal combustion sections of the combustor tubes. The NOx reduction apparatus includes a plurality of metal mesh tubes having diameters substantially less than the internal diameters of the combustion tubes. Each metal mesh tube is coaxially anchored to and telescopingly over the outlet end of one of the burners and extends therefrom coaxially into the associated combustion tube. During burner operation the burner flames injected into the combustor tubes are forced through the mesh tubes which operate to laterally reduce the cross-sections of the flames, increase their axial velocity through the combustor tubes, and substantially diminish the intimate contact of secondary combustion air with the maximum temperature zones of the flames within the combustor tubes.
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Grahl Keith M.
Lu Lin-Tao
Mullens Larry R.
Jones Larry
Rheem Manufacturing Company
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