Method for reducing the flame temperature of a burner and burner intended therefor

A burner comprising a central oxygen nozzle, at least one fuel nozzle, radially spaced from the central oxygen nozzle, and at least one peripheral oxygen nozzle at greater radial distance from the central oxygen nozzle than the fuel nozzle, all nozzles being at least substantially parallel, a casing surrounding said nozzles and whose forward end lies in a plane at right angles to the longitudinal axis of the burner, and whose rear region defines an oxygen chamber, said central oxygen nozzle in direct communication with said oxygen chamber, means for supplying oxygen-containing gas and fuel, respectively, to said nozzles, and a portion of said means for supplying said nozzles within the burner being substantially parallel with said nozzles, and characterized in that the peripheral oxygen nozzle is in the form of a converging-diverging nozzle,

• said portion of said means for supplying oxygen-containing gas and fuel, respectively, to said nozzles, and said exit apertures of all nozzles, are substantially surrounded by the casing, which is radially beyond the exit apertures of the nozzles, and is designed as a cooling jacket,
• said central oxygen nozzle and the fuel nozzle being disposed in a center body and the peripheral oxygen nozzle is disposed in a wall radially outside the center body or a fistular extension thereof, and the exit apertures of the nozzles in the center body lie in the second plane at right angles to the longitudinal axis of the burner and parallel to the first plane through the discharge opening of the peripheral oxygen nozzle and that the distance between the first and second planes is at most 2D, D being the outer diameter of the center body, and
• a fistular member concentric with the center body and of greater diameter than the center body, said member being connected to the front wall or being an extension of the casing in a forward direction, and the peripheral oxygen nozzle discharges in the cylindrical space defined by the fistular member or in the compartment defined by he fistular member and the center body, and the fistular member is provided with at least one aperture adjacent the front wall.

A burner comprising a central oxygen nozzle, at least one fuel nozzle, radially spaced from the central oxygen nozzle, and at least one peripheral oxygen nozzle at greater radial distance from the central oxygen nozzle than the fuel nozzle, all nozzles being at least substantially parallel, a casing surrounding said nozzles and whose forward end lies in a plane at right angles to the longitudinal axis of the burner, and whose rear region defines an oxygen chamber, said central oxygen nozzle in direct communication with said oxygen chamber, means for supplying oxygen-containing gas and fuel, respectively, to said nozzles, and a portion of said means for supplying said nozzles within the burner being substantially parallel with said nozzles, and characterized in that the peripheral oxygen nozzle is in the form of an annular nozzle,

• said portion of said means for supplying oxygen-containing gas and fuel, respectively, to said nozzles, and said exit apertures of all nozzles, are substantially surrounded by the casing, which is radially beyond the exit apertures of the nozzles, and is designed as a cooling jacket,
• said central oxygen nozzle and the fuel nozzle being disposed in a center body and the peripheral oxygen nozzle is disposed in a wall radially outside the center body or a fistular extension thereof, and the exit apertures of the nozzles in the center body lie in the second plane at right angles to the longitudinal axis of the burner and parallel to the first plane through the discharge opening of the peripheral oxygen nozzle and that the distance between the first and second planes is at most 2D, D being the outer diameter of the center body, and
• a fistular member concentric with the center body and of greater diameter than the center body, said member being connected to the front wall or being an extension of the casing in a forward direction, and the peripheral oxygen nozzle discharges in the cylindrical space defined by the fistular member or in the compartment defined by the fistular member and the center body, and the fistular member is provided with at least one aperture adjacent the front wall.

A burner comprising

• a chamber for receiving oxygen-containing gas,
• a central oxygen nozzle positioned within said chamber and having a central longitudinal axis and an exit aperture,
• at least one fuel nozzle for carrying only fuel positioned within said chamber radially spaced from said central oxygen nozzle and having a central longitudinal axis and an exit aperture,
• at least one peripheral converging-diverging oxygen nozzle spaced at a greater radial distance from said central oxygen nozzle than said fuel nozzle and having a central longitudinal axis and an exit aperture,
• means for supplying oxygen-containing gas and fuel to said respective nozzles,
• said central longitudinal axes of said nozzles being parallel to each other and to a longitudinal axis of said burner, said exit apertures of said central oxygen nozzle and said fuel nozzle positioned in a first plane perpendicular to said central longitudinal axes, and said exit aperture of said peripheral oxygen nozzle positioned in a second plane perpendicular to said central longitudinal axes, and
• wherein said chamber is defined by a cylindrical casing including a cooling jacket forming a part of said casing for receiving coolant material and said nozzles are substantially surrounded by said cooling jacket, a rear wall, and a front wall containing said second plane, said peripheral oxygen nozzle and an end of said cooling jacket.