초록 ▼

In an industrial glass furnace, which optionally contains recuperators, regenerators, electric boost or other devices for providing heat to glass batch material, at least one staged combustion oxy-fuel burner is mounted in the roof of the furnace to provide heat to melt the glass batch material by p

In an industrial glass furnace, which optionally contains recuperators, regenerators, electric boost or other devices for providing heat to glass batch material, at least one staged combustion oxy-fuel burner is mounted in the roof of the furnace to provide heat to melt the glass batch material by providing a flow of fuel to the oxy-fuel burner; providing a flow of gaseous oxidant in association with said the oxy-fuel burner; injecting the fuel and the oxidant into the furnace; and, combusting the fuel such that at least a portion of combustion is effected in the vicinity of said glass forming material to enhance convective and radiative transfer of heat to said glass forming material without substantially disturbing the glass forming material. In one embodiment, the oxy-fuel burner is adapted for injecting liquid fuels. In another embodiment, the oxy-fuel burner is adapted for fuel staged combustion and contains at least one outer oxidant injector and two inner fuel injectors, the innermost fuel injector being adapted for high velocity fuel injection and the other fuel injector, disposed between the innermost fuel injector and the outer oxidant injector, being adapted for lower velocity fuel injection.

대표청구항 ▼

In an industrial glass furnace, which optionally contains recuperators, regenerators, electric boost or other devices for providing heat to glass batch material, at least one staged combustion oxy-fuel burner is mounted in the roof of the furnace to provide heat to melt the glass batch material by p

In an industrial glass furnace, which optionally contains recuperators, regenerators, electric boost or other devices for providing heat to glass batch material, at least one staged combustion oxy-fuel burner is mounted in the roof of the furnace to provide heat to melt the glass batch material by providing a flow of fuel to the oxy-fuel burner; providing a flow of gaseous oxidant in association with said the oxy-fuel burner; injecting the fuel and the oxidant into the furnace; and, combusting the fuel such that at least a portion of combustion is effected in the vicinity of said glass forming material to enhance convective and radiative transfer of heat to said glass forming material without substantially disturbing the glass forming material. In one embodiment, the oxy-fuel burner is adapted for injecting liquid fuels. In another embodiment, the oxy-fuel burner is adapted for fuel staged combustion and contains at least one outer oxidant injector and two inner fuel injectors, the innermost fuel injector being adapted for high velocity fuel injection and the other fuel injector, disposed between the innermost fuel injector and the outer oxidant injector, being adapted for lower velocity fuel injection. ous metal reinforcement, comprising the steps of: providing a middle electrode with an ignition tip, tapering the ignition tip relative to a body of the middle electrode, welding a flat end of a precious metal wire with a cross section which corresponds to the tapered ignition tip onto the tapered ignition tip, and cutting the precious metal wire off at a desired height with a sharp edge. 2. The process as claimed in claim 1, wherein the ignition tip is tapered to a diameter of 2 mm or less. 3. The process as claimed in claim 1, wherein the ignition tip is tapered to a diameter of 1 mm or less. 4. The process as claimed in claim 1, wherein a continuous precious metal wire is used with a diameter which is 2 mm or less. 5. The process as claimed in claim 1, wherein a continuous precious metal wire is used with a diameter which is 1 mm or less. 6. The process as claimed in claim 1, wherein the precious metal wire is cut off to a residual section of a height from 0.3 to 1.0 mm with a sharp edge. 7. The process as claimed in claim 1, wherein the tapered ignition tip of the middle electrode is joined to the precious metal wire by resistance welding. a second abutting portion arranged to be brought into abutting contact with the first abutting portion in a direction intersecting the axes of the fitting portions, and wherein a pressing device is provided to force the inner and outer circumferential surfaces against each other by abutting contact of the first abutting portion with the second abutting portion. monolithic body, toward the marking station (3) downstream, the positioning of the subassembly comprising the monolithic body (36) in the pre-cut tube (39) being verified by monitoring the movement of the displacement and insertion means (12). 6. Device according to claim 5, characterized in that the means (12) for movement and insertion of the monolithic body (36) is constituted by a hydraulic, pneumatic or electric jack, whose path is controlled by means of end-of-path contacts, whilst the means (12') for holding the tube in abutment consists of a simple abutment against which said tube bears. 7. Device according to claim 3, characterized in that the marking station (4) of the pre-cut tube (39) is constituted by a marking device with tools for cutting or altering the surface, of the laser cutter or percussion type. 8. Device according to claim 3, characterized in that the specific means (4) for holding, gripping and driving in rotation the pre-cut tube (39) with the subassembly comprising the active monolithic body (36), consists of a stanchion (13) forming a support frame for a mandrel (14) with access from both sides, driven in rotation by a motor (15) also mounted on said frame. 9. Device according to claim 8, characterized in that the mandrel (14) is provided with jaws (14') for rapid gripping, remotely controlled. 10. Device according to claim 8, characterized in that the specific means (4) for holding, gripping and driving in rotation the pre-cut tube (39) is moreover completed by automatic positioning abutments (4'), disposed symmetrically on opposite sides of the stanchion (13) forming the support frame for the mandrel (14) with access from both sides, and extending along the axis of said mandrel (14). 11. Device according to claim 10, characterized in that the automatic positioning abutments (4') are constituted by jacks, whose piston rod is provided with a plate or disc bearing against the corresponding ends of the pre-cut tube (39) enclosing the subassembly comprising the active monolithic body (36) and whose path is previously adjusted by means of abutments. 12. Device according to claim 3, characterized in that the stations (5) for the possible distribution and emplacement of insulating cones (38), in the corresponding ends of the pre-cut tube (39), consist essentially in two devices for presentation of said cones in a vertical posture, with an arm (20) for transferring and inserting it in said ends of the pre-cut tube (39), each presentation device being provided with supply means by gravity or by pressure, delivering said cones individually. 13. Device according to claim 12, characterized in that the supply means is either a gravity distributor provided with individual retaining and delivering means for said cones, or in the form of a spring-loaded distributor placing the cones vertically against an abutment for individual holding and delivery. 14. Device according to claim 3, characterized in that the installation (6) for heating and holding at temperature the ends to be deformed of the pre-cut tube (39) mounted in the mandrel (14) of the specific means (4) for holding, gripping and driving in rotation, comprises, on the one hand, at least two rows (21) of gas burners extending each along a generatrix of the ends of the pre-cut tube and, on the other hand, at least one forming burner (22) adapted to precede the device (7) that deforms with rollers, so as to maintain a constant forming temperature. 15. Device according to claim 14, characterized in that the row (21) of burners and the forming burner (22) associated with each end of the pre-cut tube (39), are connected to an independent distribution device (23) specific to said ends. 16. Device according to claim 14, characterized in that the installation (6) for heating and holding at temperature the ends to be deformed of the pre-cut tube (39), is completed by a means (24) for control of the temperature of said ends, consisting in an infrared cell or another