Low NO.sub.x burner

  • US 5,603,906 A
  • Filed: 11/20/1995
  • Issued: 02/18/1997
  • Est. Priority Date: 11/01/1991
  • Status: Expired due to Term
First Claim
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1. In a burner adapted to reduce emission of noxious gases upon combustion of a fuel and air, the burner including a source of combustion fuel, at least a portion of the combustion air flowing through a central air passage into which the combustion fuel is supplied for combustion within a combustion zone of the burner creating combustion gases, the improvement comprising:

  • an annular combustion fuel passageway radially surrounding said central air passage;

    an annular combustion gases passageway radially surrounding said central air passage and being in fluid communication with said combustion fuel passageway;

    a plurality of eductor nozzles radially spaced about the central air passage for combining combustion fuel with combustion gases recirculated from the combustion zone, said eductor nozzles having an outlet in fluid communication with said central air passage and an inlet which extends into the combustion fuel passageway, said inlet being in fluid communication with both said combustion fuel passageway and said combustion gases passageway for mixing said combustion fuel with said recirculated combustion gases within said eductor nozzles and directing said mixture into said central air passage for combustion, said combustion fuel and combustion gases being combined prior to mixture with the combustion air and introduction into the combustion zone for optimum combustion and reduction of noxious emissions; and

    a plurality of staged combustion zones axially spaced along said central air passage, each of said combustion zones having a set of radially spaced eductor nozzles in fluid communication with both said combustion fuel passageway and said recirculated combustion gases passageway for introduction of a mixture of combustion fuel and combustion gases into said staged combustion zones.

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