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The invention has for its object a radiant flat flame burner used particularly in reheating furnaces for siderurgical purposes, which comprises in combination: a combustion air swirling device consisting of fixed flat blades, fitted in the combustion air annular duct, and adapted for imparting to

The invention has for its object a radiant flat flame burner used particularly in reheating furnaces for siderurgical purposes, which comprises in combination: a combustion air swirling device consisting of fixed flat blades, fitted in the combustion air annular duct, and adapted for imparting to the combustion air a swirling motion; a fire port of ceramic material, composed of a substantially cylindrical rear portion and of an adjoined flaring fore portion, delimited by a wall having a profile in form of a sector of a circle and extending over an angle of 90°; a liquid fuel atomizing nozzle, the liquid fuel atomizing nozzle being provided with a swirling device, which is adapted for imparting a swirling motion to the atomized liquid fuel.

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1. A radiant flat flame burner for liquid and/or gas fuels, comprising: (a) at least two centrally-arranged nozzles, one for liquid fuel outflow and another for gas fuel, an atomizing nozzle for receiving the liquid fuel nozzle and forming a part of a lance, the lance comprising one duct for deli

1. A radiant flat flame burner for liquid and/or gas fuels, comprising: (a) at least two centrally-arranged nozzles, one for liquid fuel outflow and another for gas fuel, an atomizing nozzle for receiving the liquid fuel nozzle and forming a part of a lance, the lance comprising one duct for delivery of the liquid fuel to the liquid fuel nozzle, and a second duct for delivery of an atomizing fluid, each duct being connected to the atomizing nozzle which is at the extremity of the lance to atomize liquid fuel, characterized by the fact that the liquid fuel outflow nozzle, opens into a convergent-divergent conduit within said atomizing nozzle, which is connected to the duct for delivery of the atomizing fluid, the atomizing nozzle having incorporated therein a swirling device adapted to impart a whirling motion to the atomized liquid fuel, and (b) a coaxial combustion air annular conduit provided around the said centrally arranged nozzles and connected to a burner fire port delimited by refractory surfaces, characterized by the fact that the burner fire port has a rear cylindrical portion, with its rear end connected and coaxial with the combustion air conduit and with its front end having a flaring fore portion, widening out continuously towards its outlet end. 2. A burner according to claim 1, characterized by the fact that the swirling device consists of at least one fixed small-height cylindrical member with head ends, and the said cylindrial member is provided with a plurality of peripheral helical grooves opening on both head ends of the said cylindrical member. 3. A burner according to claim 2, characterized by the fact that the swirling device consists of two fixed cylindrical members provided with peripheral helical grooves, the members being in a coaxial, spaced apart relation, and being interconnected by means of a stem having a smaller diameter than the cylindrical members that it connects. 4. A burner according to claim 3, characterized by the fact that the opposite head ends of the helically grooved cylindrical members of the swirling device have a pointed conical shape. 5. A burner according to claim 2 wherein that the opposite head ends of the helically grooved cylindrical member of the swirling device have a pointed conical shape. 6. A radiant flat flame burner for liquid and/or gas fuels, comprising at least two centrally arranged nozzles, one for liquid fuel and another for gas fuel, with the nozzle for the liquid fuel being a lance, comprising at least one duct for delivery of an atomizing fluid, and at least one duct for delivery of the liquid fuel and which ducts are connected to an atomizing nozzle, provided at the extremity of the lance to atomize the liquid fuel, characterized by the fact that the liquid fuel outflow nozzle, connected to the liquid fuel delivery duct, opens into a convergent-divergent conduit connected to the duct for delivery of the atomizing fluid, the liquid fuel atomizing nozzle comprising a swirling device which is adapted for imparting to atomized liquid fuel a whirling motion, the swirling device consisting of two fixed cylindrical members provided with peripheral helical grooves, the members being set in a coaxial, spaced-apart relation and being interconnected by means of a stem having a smaller diameter than the cylindrical members that it connects, and also a coaxial combustion air annular conduit provided around said centrally arranged nozzles and connected to a burner fire port delimited by refractory surfaces, characterized by the fact that the burner fire port has a cylindrical portion with its rear end connected and coaxial with the combustion air conduit and with its front end having a flaring fore portion, widening out continuously to its outlet end. 7. A burner according to claim 6 within the two fixed cylindrical members have opposite head surfaces having a pointed conical shape. 8. A radiant flat flame burner for liquid and/or gas fuels comprising at least two centrally arranged nozzles, one for liquid fuel and the other for gas fuel, and also a coaxial combustion air annular conduit provided around said centrally arranged nozzles and connected to a burner fire port delimited by refractory surfaces, in which the burner fire port has a cylindrical portion with its rear end connected and coaxial with the combustion air conduit and with its front end having a flaring fore portion, widening out continuously towards its outlet end, the flaring fore portion of the burner fire port is delimited by a surface of revolution around the axis of the burner, with a profile in form of a sector of a circle, the profile in form of a sector of a circle of the fire port fore portion extends over an angle of 90 degrees, the ratio h:D:R between the axial length h of the rear cylindrical portion of the burner fire port, the diameter D of the said portion, and the radius R of the profile in the form of a sector of circle of the fire port fore portion, corresponds to 1:3 to 5:7 to 9, in the combustion air annular conduit a combustion air swirling device adapted for imparting to the combustion air a vertical motion, is provided arranged around the central nozzles for the gas and/or the liquid fuel, with a centrally arranged lance for delivering and atomizing the liquid fuel, comprising at least one duct for delivery of an atomizing fluid, and at least one duct for delivery of the liquid fuel, which ducts are connected to an atomizing nozzle provided at the extremity of the lance to atomize the liquid fuel, the liquid fuel outflow nozzle, connected to the liquid fuel delivery duct, opening into a convergent-divergent conduit connected to the duct for delivery of the atomizing fluid, the liquid fuel atomizing nozzle comprising a swirling device which is adapted for imparting to the atomized liquid fuel whirling motion, said swirling device consisting of at least one fixed small-height cylindrical member with head ends and the said cylindrical member is provided with a plurality of peripheral grooves opening on both head ends of the said cylindrical member. 9. A radiant flat flame burner for liquid and/or gas fuels, comprising at least two centrally arranged nozzles, one for liquid fuel outflow and one for gas fuel, and also a coaxial combustion air annular conduit provided around said centrally arranged nozzles and connected to a burner fire port delimited by refractory surfaces, characterized by the fact that the burner fire port has a cylindrical portion with its rear end connected and coaxial with the combustion air conduit and with its front end having a flaring fore portion, widening out continuously towards its outlet end, the flaring fore portion of the burner fire port is delimited by a surface of revolution around the axis of the burner, with a profile in the form of a sector of a circle, the profile in the form of a sector of a circle of the fire port fore portion extends over an angle of 90 degrees, the ratio h:D:R between the axial length h of the rear cylindrical portion of the burner fire port, the diameter D of the said portion, and the radius R of the profile in the form of a sector of a circle of the fire port fore portion, corresponds to 1:3 to 5:7 to 9, in the combustion air annular conduit a combustion air swirling device adapted for imparting to the combustion air a vertical motion, is provided arranged around the central nozzles for the gas and/or the liquid fuel, a centrally arranged lance for delivering liquid fuel, particularly heavy fuel oil, to an atomizing nozzle comprising at least one duct for delivery of an atomizing fluid, and at least one duct for delivery of the liquid fuel, which ducts are connected to the atomizing nozzle provided at the extremity of the lance to atomize the liquid fuel, characterized by the fact that the liquid fuel outflow nozzle, connected to the liquid fuel delivery duct, opens into a convergent-divergent conduit within said atomizing nozzle and connected to the duct for delivery of the atomizing fluid, which convergent-divergent conduit in the liquid fuel atomizing nozzle leads to the outside by means of a coaxial central bore with a thin edge located at the end of the liquid fuel atomizing nozzle. 10. A radiant flat flame burner for liquid and/or gas fuels, comprising: (a) at least two centrally-arranged nozzles, one for liquid fuel and another for gas fuel, with the nozzle for the liquid fuel being a lance, comprising at least one duct for delivery of an atomizing fluid and at least one duct for delivery of the liquid fuel, each duct being connected to an atomizing nozzle provided at the extremity of the lance to atomize liquid fuel, characterized by the fact that a liquid fuel outflow nozzle, connected to the liquid fuel delivery duct, opens into a convergent-divergent conduit connected to the duct for delivery of the atomizing fluid, the convergent-divergent conduit in the liquid fuel atomizing nozzle leading to the outside by means of a coaxial central bore with a thin edge located at the end of the liquid fuel atomizing nozzle, and (b) a coaxial combustion air annular conduit provided around the said centrally arranged nozzles and connected to a burner fire port delimited by refractory surfaces, characterized by the fact that the burner fire port has a rear cylindrical portion, with its rear end connected and coaxial with the combustion air conduit and with its front end having a flaring fore portion, widening out continuously towards its outlet end.