A gaseous fuel-air burner having a bluff body flame stabilizer, and methods of operating the same, are described herein. One device includes a bluff body configured to stabilize a flame produced by the gaseous fuel-air burner, wherein the bluff body has a conical shape configured to stabilize the flame by generating a recirculation zone having a stagnation point where the flame is stabilized.

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 burner includes an oxidant feed passage, a fuel feed passage surrounding the oxidant feed passage, an air feed surrounding the fuel feed passage, a movable air flow diverter and, optionally, a flame nozzle. The movable air flow diverter and/or flame nozzle are independently configured to create one or a plurality of gas recirculation regions adjacent the downstream tip of the burner to improve the mixing and reaction of the fuel and oxidant, and overall combustion process efficiency. A related furnace and method for generating a stable flame with the burner are also provided.

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 burner arrangement (1), for a mobile heater operated with liquid fuel, is provided; having a combustion chamber (2) for converting fuel with combustion air in a flaming combustion, which combustion chamber (2) extends along a longitudinal axis (Z) in a main flow direction (H); a pre-mixing chamber (3), which is arranged fluidicly upstream of the combustion chamber (2), for generating a fuel-combustion air-mixture, which pre-mixing chamber (3) comprises a side wall (4); a fuel evaporation surface (O) arranged in the pre-mixing chamber; a fuel supply (10) for supplying liquid fuel; and a first combustion air supply (6) having a swirl body (7) for supplying a combustion air flow into the pre-mixing chamber (3) with a swirl such that the combustion air is guided along the fuel evaporation surface (O) with a tangential flow component. A neck portion (5) is formed at a transition from the pre-mixing chamber (3) to the combustion chamber (2) at which the flow cross-section abruptly widens in the main flow direction (H).

Burner for an oven for reheating siderurlogical products such as billets, blooms or slabs, or for heat treatment oven, which is equipped with a fuel injection device and with an oxidant feed body feeding feed orifices with oxidant, the burner having an axial direction; the injection device is designed to provide a central injection of fuel via an orifice in, or parallel to, the axial direction of the burner; the oxidant feed body includes two sets of four oxidant feed orifices, each set including two orifices situated above a horizontal plane passing through the axial direction of the burner, and two orifices situated below this plane, the orifices of a second set being further away from the horizontal plane than those of the first set, the geometric axes of the orifices of the two sets making angles of inclination with respect to the axial direction of the burner.

A gaseous fuel-air burner having a bluff body flame stabilizer, and methods of operating the same, are described herein. One device includes a bluff body configured to stabilize a flame produced by the gaseous fuel-air burner, wherein the bluff body has a conical shape configured to stabilize the flame by generating a recirculation zone having a stagnation point where the flame is stabilized.

An apparatus for burning of a gaseous fuel includes a gas manifold comprising a blast tube with an axis of rotation and an outer wall; a center bluff body disposed inside the blast tube; a plurality of aerodynamic blocks circumferentially distributed in the annular space between the blast tube and the center bluff body, creating passage channels for combustion air between the aerodynamic blocks; two injector nozzles located inside the wake zone of each of the aerodynamic block and are fluidically communicating to the gas manifold; an air control mechanism comprising a center hub and a plurality of air control modules. The control modules fit through the passage channels. Each air control module comprises an air deflector located at the outer edge of a passage channel.

The current invention discloses an apparatus for burning of a gaseous fuel, said apparatus comprising a gas manifold comprising a blast tube with an axis of rotation; a center bluff body; a plurality of aerodynamic blocks circumferentially distributed in the annular space between said blast tube and said center bluff body, creating passage channels for combustion air between said aerodynamic blocks; two injector nozzles located inside the wake zone of each of said aerodynamic block, said injector nozzles fluidically communicating to the gas manifold; an air control mechanism comprising a center hub and a plurality of air control modules, said air control modules fitting through said passage channels, wherein each air control module comprising an air deflector located at the outer edge of a passage channel, said deflector forming an angle theta equal to or greater than 30 degrees from said axis of rotation.

Burner for an oven for reheating siderurlogical products such as billets, blooms or slabs, or for heat treatment oven, which is equipped with a fuel injection device and with an oxidant feed body feeding feed orifices with oxidant, the burner having an axial direction; the injection device is designed to provide a central injection of fuel via an orifice in, or parallel to, the axial direction of the burner; the oxidant feed body includes two sets of four oxidant feed orifices, each set including two orifices situated above a horizontal plane passing through the axial direction of the burner, and two orifices situated below this plane, the orifices of a second set being further away from the horizontal plane than those of the first set, the geometric axes of the orifices of the two sets making angles of inclination with respect to the axial direction of the burner.