Radiant flat flame burner

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.

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.

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.

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.