A radiant tube recuperative burner assembly having a heat exchanger (13) and a burner (11); said heat exchanger (13) comprises: a first inner tube (15); a second heat exchanger tube (16) coaxial and external to the first tube (15); a third tube (24) coaxial and external to said second tube (16); a fourth tube (35) positioned perpendicular to said first tube (15); a fifth tube (36) coaxial and internal to said fourth tube (35); a flue gas outlet passage (27) positioned inside said fifth tube (36); a first gap (17) between said first tube (15) and said second tube (16); a second gap (25) between said third tube (24) and said second tube (16); a sixth gap (40) between said fourth tube (35) and said fifth tube (36); said first gap (17) communicates with said sixth gap (40); said second gap (25) communicates with said flue gas outlet passage (27); a Venturi tube (41, 52) positioned transverse to said fifth tube (36); the inlet of the Venturi tube (41, 52) communicates with said sixth gap (40); said Venturi tube (41, 52) has an outlet that is in communication with said flue gas outlet passage (27); and with a connection pipe (42) between said heat exchanger (13) and said burner (11).

A radiant tube recuperative burner assembly having a heat exchanger (13) and a burner (11); said heat exchanger (13) comprises: a first inner tube (15); a second heat exchanger tube (16) coaxial and external to the first tube (15); a third tube (24) coaxial and external to said second tube (16); a fourth tube (35) positioned perpendicular to said first tube (15); a fifth tube (36) coaxial and internal to said fourth tube (35); a flue gas outlet passage (27) positioned inside said fifth tube (36); a first gap (17) between said first tube (15) and said second tube (16); a second gap (25) between said third tube (24) and said second tube (16); a sixth gap (40) between said fourth tube (35) and said fifth tube (36); said first gap (17) communicates with said sixth gap (40); said second gap (25) communicates with said flue gas outlet passage (27); a Venturi tube (41, 52) positioned transverse to said fifth tube (36); the inlet of the Venturi tube (41, 52) communicates with said sixth gap (40); said Venturi tube (41, 52) has an outlet that is in communication with said flue gas outlet passage (27); and with a connection pipe (42) between said heat exchanger (13) and said burner (11).

A device for the post-combustion of exhaust air, comprises a burner, which has a fuel nozzle, and a burner cone and which protrudes in a raw-gas chamber, into an exhaust-air flow of exhaust air to be treated at least by the burner cone of the burner. The burner cone has a one- or a multi-part wall, which wall surrounds the pre-mixing chamber and has one or more wall segments. The fuel nozzle comprises an opening of at least one fuel outlet for discharging fuel into the pre-mixing chamber. The wall bounding the pre-mixing chamber outwardly on the lateral side has a structure such that the pre-mixing chamber formed in the interior of the wall opens in the downward direction in the manner of a funnel on at least one cone longitudinal segment symmetrically to an axis of symmetry defining the axial direction of the burner. The burner cone comprises, in at least one longitudinal segment of the cone longitudinal segment of the wall, which cone longitudinal segment opens in the manner of a funnel, a plurality of tangential inlet openings in order for exhaust air surrounding the burner cone to enter the pre-mixing chamber tangentially.

A device for the post-combustion of exhaust air, comprises a burner, which has a fuel nozzle, and a burner cone and which protrudes in a raw-gas chamber, into an exhaust-air flow of exhaust air to be treated at least by the burner cone of the burner. The burner cone has a one- or a multi-part wall, which wall surrounds the pre-mixing chamber and has one or more wall segments. The fuel nozzle comprises an opening of at least one fuel outlet for discharging fuel into the pre-mixing chamber. The wall bounding the pre-mixing chamber outwardly on the lateral side has a structure such that the pre-mixing chamber formed in the interior of the wall opens in the downward direction in the manner of a funnel on at least one cone longitudinal segment symmetrically to an axis of symmetry defining the axial direction of the burner. The burner cone comprises, in at least one longitudinal segment of the cone longitudinal segment of the wall, which cone longitudinal segment opens in the manner of a funnel, a plurality of tangential inlet openings in order for exhaust air surrounding the burner cone to enter the pre-mixing chamber tangentially.

According to an embodiment, a burner system includes a pilot burner disposed in a furnace at a distal position along a main fuel and combustion air flow axis, and one or more main fuel nozzles disposed at a proximal position along the main fuel and combustion air flow axis. The pilot burner is configured to support a pilot flame and the one or more main fuel nozzles are configured to support a main flame in contact with the pilot flame. The pilot burner is disposed to cause the main fuel and combustion air to be ignited by the pilot flame. The pilot burner may support a diffusion pilot flame or may include a premixing apparatus to support a pre-mixed flame.

According to an embodiment, a burner system includes a pilot burner disposed in a furnace at a distal position along a main fuel and combustion air flow axis, and one or more main fuel nozzles disposed at a proximal position along the main fuel and combustion air flow axis. The pilot burner is configured to support a pilot flame and the one or more main fuel nozzles are configured to support a main flame in contact with the pilot flame. The pilot burner is disposed to cause the main fuel and combustion air to be ignited by the pilot flame. The pilot burner may support a diffusion pilot flame or may include a premixing apparatus to support a pre-mixed flame.

Embodiments of the present invention include high-temperature staged recirculating burners and radiant tube burner assemblies that provide high efficiency, low NOx and CO emissions, and uniform temperature characteristics. One such staged recirculating burner includes a combustion tube having inside and outside helical fins forming opposing spiral pathways for combustion gases and products of combustion, a combustion nozzle coupled to the combustion tube, a gas tube running axially into the combustion tube, and a staging gas nozzle coupled to the gas tube, where the staging gas nozzle includes radial exit holes into the combustion tube and an axial gas staging tube extending into the combustion nozzle to stage combustion.

A small-scale thermoelectric power generator and combustion apparatus, components thereof, methods for making the same, and applications thereof. The thermoelectric power generator can include a burner including a matrix stabilized combustion chamber comprising a catalytically enhanced, porous flame containment portion. The combustion apparatus can include components connected in a loop configuration including a vaporization chamber; a mixing chamber connected to the vaporization chamber; a combustion chamber connected to the vaporization chamber; and a heat exchanger connected to the combustion chamber. The combustion chamber can include a porous combustion material which can include a unique catalytic material.

A burner apparatus and method which provide an increased amount of internal flue recirculation for reducing NO.sub.x emissions by ejecting a series of surrounding primary fuel streams and also ejecting on one or more subsequent series of surrounding fuel streams outside of the burner wall toward the burner combustion wherein each succeeding series of surrounding fuel streams must travel a greater distance to the combustion zone and each series of surrounding fuel streams must contact one or more radial impact structures provided on the exterior of the burner wall.

A fuel-fired burner 100 includes a combustion air inlet 113 for receiving combustion air coupled to a combustion air nozzle 136 at an input to a second chamber 152 within a burner housing 110 spaced apart from a third chamber 168 within the second chamber. The combustion air nozzle 136 directs the combustion air 171 into the third chamber 168. A fuel inlet 111 coupled to a burner nozzle 167 secured to a burner mounting plate 161 has a recycle port 164 for receiving hot exhaust gas provided to an exhaust gas path 165. A jet pump located entirely inside the burner housing is configured to receive the hot exhaust gas from the exhaust gas path. The jet pump operates by flowing the combustion air through the combustion air nozzle 136 which suctions in the hot exhaust gas through the recycle port into the exhaust gas path then into a gas mixing zone 178 for mixing the hot exhaust gas and the combustion air.