| 摘要 |
PROBLEM TO BE SOLVED: To provide a bottom-blow tuyere having improved durability by maintaining a mushroom depositing in the bottom-blow tuyere into a preferable size, and effectively utilizing a protection effect of the mushroom. SOLUTION: The bottom-blow tuyere is arranged in the bottom of a smelting vessel which accommodates a molten metal; is used for blowing a smelting gas into a smelting vessel therethrough; has a cylindrical outer pipe and a cylindrical inner pipe arranged so that the central axis of the outer pipe matches the central axis of the inner pipe to provide an annular space between the outer pipe and the inner pipe; and has two or more narrow tubes arranged in refractories arrayed around the outer pipe so that the centers of the narrow tubes are circularly disposed around the central axis of the outer pipe. COPYRIGHT: (C)2007,JPO&INPIT
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