Patent ID: 6355205
Filing Date: 2002-03-12
Classification: C21C,F23D,F23M,Y02P

Abstract:
A method of using a multi-function lance in a vacuum degassing chamber, comprising a water-cooled cylindrical top-blown oxygen lance equipped with an gaseous oxygen path formed with a nozzle provided at a downstream end of said oxygen path used for blowing oxygen onto a molten metal; a water-cooled jacket surrounding the outer periphery of said top-blown oxygen lance; at least a set of paths for a fluid fuel and a gas for burning the fuel, being positioned in a multi-function lance; a combustion burner provided at a downstream end of said paths; and a sensor that detects a flame via an aperture provided in a transparent plate at the axial center of said top-blown oxygen lance; andsupplying a small amount of oxygen to the inside of the top-blown oxygen lance in such a manner to elevate the temperature of the portion of the flame which is being detected by said sensor through said aperture.