| 摘要 |
PURPOSE:To protect advantageously the tuyere of a blowpipe by recovering exhaust gas from a refining vessel without causing burning, removing N2 from the gas under specified conditions, and feeding the remaining gas to the tuyere as a flow of a covering gas. CONSTITUTION:A flow of gaseous O2 or a gas contg. O2 for refining is blown into an iron bath contained in a refining vessel from the tuyere of a blowpipe for refining molten iron through the wall of the vessel together with a flow of a covering gas which flows around the flow of the refining gas. Exhaust gas from the refining vessel is recovered without causing burning, N2 is removed from the gas in accordance with the equation, and the remaining gas is fed as the flow of the covering gas. In the equation, CN2 is the concn. (%) of N2 in the covering gas, qo is the total flow rate (Nm<3>/min) of gaseous O2 for refining, and qBo is the flow rate (Nm<3>/min) of O2 fed to the tuyere of the blowpipe. |
