DEVICE FOR SEALING SUB-LANCE AT PRESSURIZING HOOD

PURPOSE:To prevent leakage of furnace gas and unstable furnace condition caused by lowering pressure in the furnace by arranging sealing device having the specific construction at the time of fitting as freely inserting a sub-lance for measuring temp. and sampling of molten metal in a pressurized hood at furnace opening part in pressurizing closed type metal refining furnace. CONSTITUTION:At the time of refining the molten metal in the pressurizing closed type metal refining furnace of converter, etc., having high pressure in the furnace 4 for measuring molten metal or sampling of the molten metal is inserted into the furnace on the way of the operation. In this case, in order to prevent blowing-out by leakage of the furnace gas containing high pressure CO gas from circumference of the sub-lance 4, the opening parts 5, 7 for inserting the sub-lance 4 are arranged on the closing pressurized hood 2 at the furnace opening part in the converter and on this sub-lance, outer cylinder 8 is connected with the opening parts 5, 7 and also the sealing member 9 is fitted as slidable. Further, at the lower end thereof, the sealing device 11 is fitted on the opening part at upper end of the outer cylinder 8, and at the lower end of the outer cylinder 8, sealing gate 13 is arranged and also a supplying pipe 14 for supplying inert gas with high pressure is connected with the upper part thereof. The temp. measurement and the sampling can be executed with the sub-lance without spouting the high pressure gas in the furnace.