OXYGEN TUYERE Russian patent published in 1996 - IPC

FIELD: metallurgy. SUBSTANCE: tuyere has ribbed outer pipe 1 with ribs 12 and tip 7 with ribs 13, with ribs being positioned on inner surfaces. Inner tube 2 is in contact by its lower end with ribs 13 of tip 7 through flange 2 and through flange 14 and by its upper end is conjugated with wall of central pipe 3 through flange 15 and sliding seal 16. Through openings defining nozzles 17 are made in the vicinity of lower end of inner tube 2. Openings-nozzles 17 are concentrated on 1/3 of inner pipe length and have total area making 1.8-2.0 of area of annular space 9 between edge of flange 14 and tip 7. Tip 7 made from sheet carbon steel is formed as single-plate half- toroid with radial ribs 13 and replaceable nozzles 8. Central part of tip 7 with nozzles 8 is protected from high temperatures of reaction zone by refractory material 19 and peripheral (half-toroidal) part is protected from metallization by layer 20 of alloy with low adhesion to liquid metal. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 cl, 3 dwg