| 摘要 |
<p>A gas blowing nozzle which is not required to be increased in length, is not required to be exchanged, can be used in existing refining facilities without largely modifying the facilities, does not require the opening of a standby nozzle at the time of the changeover of a gas blowing operation, and has a further extended service life. A gas blowing nozzle comprises: a first nozzle section (10) provided with first metallic narrow pipes (11), a first surge tank (12), and a first fireproof substance (13), the first metallic narrow pipes (11) having furnace-side tips which are exposed to the inside of the furnace and being in a state in which the first metallic narrow pipes (11) can blow gas into molten metal within the furnace; and a second nozzle section (20) provided with second metallic narrow pipes (21), a second surge tank (22), and a second fireproof substance (23), the second metallic narrow pipes (21) being embedded in the fireproof substance and having closed furnace-side tips. When the damage and wear of the fireproof substance (23) progress and reach the furnace-side tip of the second metallic narrow pipes of the second nozzle section, the blowing of gas from the second metallic narrow pipes (21) of the second nozzle section (20) is started and the blowing of gas from the first nozzle section (10) is stopped.</p> |
