OXYGEN-BLOWING LANCE IN VACUUM REFINING APPARATUS

摘要

Disclosed is an oxygen-blowing lance for feeding oxygen installed an RH vacuum refining apparatus which includes a ladle for storing molten steel, a vacuum chamber arranged over the ladle and submerged conduits providing circulation channels for the flow of molten steel between the ladle and the vacuum chamber. The oxygen-blowing lance is mounted to penetrate the side wall of the vacuum chamber with an inclination angle and comprises: an oxygen feeding pipe for blowing oxygen into the vacuum chamber; a tubular body for surrounding the outer surface of the oxygen feeding pipe and extending from a leading end of the oxygen feeding pipe exposed within the vacuum chamber toward the outside of the vacuum chamber f or a length, the tubular body being closed at both ends; and volatile liquid substance stored in a closed storage space defined between an inner surface of the tubular bo dy and the outer surface of the oxygen feeding pipe, wherein the volatile liquid substance is evaporated due to the internal temperature within the vacuum chamber, and evaporated gas substance is condensed due to the temperature outside the vacuum chamber . Accordingly, the invention can effectively cool the leading end of the oxyge n- blowing lance without worsening the degree of vacuum in the vacuum chamber or having any risk of explosion due to the leakage of cooling water.