| 摘要 |
<p>1,046,864. Furnace tuyeres. L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE. July 29, 1963 [Aug.7, 1962; April 12, 1963], No. 30034/63. Heading F4B. An injector in a metallurgical furnace comprises a central duct 1 for injecting a first fluid into the melt having a surrounding permeable sheath 2 through which a second fluid is fed to the melt. As shown, the sheath comprises a trapezoidal block which is cemented in the lining 3 of the furnace, the peripheral walls of the block being coated with an impervious layer 4. The block may be of a porous refractory or may be provided with a plurality of discrete narrow bores 12 which communicate an annular header groove 7 with the sheath top face 5. Oxygen may be passed through the central duct and a cooling fluid, such as water, steam, carbon dioxide or mixtures thereof, through the sheath. Alternatively, hydrogen may be injected through the sheath when the injector is used as a burner. In steel-making operations, oxygen may be the secondary fluid and air laden with comminuted material, such as lime, may be the primary fluid. In another embodiment, Fig. 2 (not shown), the porous block is supplied with a coolant fluid via annulus 7 and oxygen is fed through additional convergent ducts 14 from an annular header tube 19 to meet a centrally injected jet of limecarrying gas. Fig. 4 (not shown) illustrates a converter bottom unit having a plurality of the injectors described which is adapted to replace a conventional converter bottom. Fig. 5 (not shown) illustrates an alternative construction of the injector in which the annular cavity 7 is formed by two concentric and spaced washers 35, 35a.</p> |
