Burner assembly with dual register and throat construction

Claim 2

Apparatus for reducing the temperature in the furnace section of a vapor generator formed with heat absorption tubular walls having port openings, comprising a plurality of burners mounted adjacent said port openings, each of said burners formed with a cylindrical wall having an exhaust aperture for introducing a stream of products of combustion into said furnace, an enclosure surrounding said burners for conveying substantially inert gases to said port openings, said cylindrical wall having an orifice for introducing a portion of said inert gases to said burners, throat means surrounding each of said burners coaxially mounted in each of said port openings to form an annular passageway, primary register means movably mounted in said enclosure between each of said burners and associated throat means and secondary register means movably mounted in said enclosure between each of said throat means and associated port opening, whereby said inert gases are divided into a primary stream which is directly mixed with said stream of products of combustion and a secondary annular gas sheath which is passed through said annular passageway and exhausted beyond said throat means to surround said stream of products of combustion such that the temperature and oxygen content of said stream of products of combustion is reduced and the formation of nitrogen oxides is retarded.

Claim 3

Apparatus according to claim 1 in which said enclosure conveys said stream of gases to said primary register means and said secondary register means.

Claim 4

Apparatus according to claim 1, in which said enclosure includes a secondary wind box mounted on said furnace and in flow communication with said secondary register means, and a main wind box mounted on said secondary wind box in flow communication with said primary register means.

Claim 5

Apparatus according to claim 1 in which said throat means includes a throat ring integrally formed with a frustoconical collar, said primary register means includes a series of vanes movably mounted between each of said burners and associated collar, and said secondary register means includes a series of vanes movably mounted between the exterior of said walls and said collar.

Claim 6

Apparatus for reducing the temperature in the furnace section of a vapor generator formed with heat absorption tubular walls having port openings, comprising a plurality of burners mounted adjacent said port openings, each of said burners formed with a cylindrical wall havIng an exhaust aperture for introducing a stream of products of combustion into said furnace, an enclosure surrounding said burners for conveying substantially inert gases to said port openings, throat means surrounding each of said burners coaxially mounted in each of said port openings to form an annular passageway, primary register means movably mounted in said enclosure between each of said burners and associated throat means and secondary register means movably mounted in said enclosure between each of said throat means and associated port opening, said enclosure including a secondary wind box mounted on said furnace and in flow communication with said secondary register means, and a main wind box mounted on said secondary wind box in flow communication with said primary register means, whereby said inert gases are divided into a primary stream which is passed through said main wind box and directly mixed with said stream of products of combustion and a secondary annular gas sheath from said secondary wind box which is passed through said annular passageway and exhausted beyond said throat means to surround said stream of products of combustion such that the temperature and oxygen content of said stream of products of combustion is reduced and the formation of nitrogen oxides is retarded.

Claim 7

Apparatus for reducing the temperature in the furnace section of a vapor generator formed with heat absorption tubular walls having port openings, comprising a plurality of burners mounted adjacent said port openings, each of said burners formed with a cylindrical wall havIng an exhaust aperture for introducing a stream of products of combustion into said furnace, an enclosure surrounding said burners for conveying substantially inert gases to said port openings, throat means surrounding each of said burners coaxially mounted in each of said port openings to form an annular passageway, primary register means movably mounted in said enclosure between each of said burners and associated throat means and secondary register means movably mounted in said enclosure between each of said throat means and associated port opening, said enclosure including a secondary wind box mounted on said furnace and in flow communication with said secondary register means, and a main wind box mounted on said secondary wind box in flow communication with said primary register means, whereby said inert gases are divided into a primary stream which is passed through said main wind box and directly mixed with said stream of products of combustion and a secondary annular gas sheath from said secondary wind box which is passed through said annular passageway and exhausted beyond said throat means to surround said stream of products of combustion such that the temperature and oxygen content of said stream of products of combustion is reduced and the formation of nitrogen oxides is retarded.

Claim 8

Apparatus according to claim 5 in which said throat means includes a throat ring integrally formed with a frustoconical collar, said primary register means includes a series of vanes movably mounted between each of said burners and associated collar, and said secondary register means includes a series of vanes movably mounted between the exterior of said walls and said collar.