METHOD AND APPARATUS FOR CONTINUOUSLY MEASURING TEMPERATURE OF MOLTEN METAL

摘要

PURPOSE:To reduce measuring cost by reducing wear of the parts of a temp. measuring probe, by continuously measuring the temp. of a molten metal using a radiation thermometer having a non-consumption type temp. measuring probe. CONSTITUTION:The blow gas for a temp. measuring probe 10 is allowed to flow not only to cool an optical fiber 11 but also to prevent the penetration of molten steel from the leading end of a tuyere during blowing and the blow gas for a porous nozzle is passed to promote the stirring of molten steel. The radiation energy from the surface of molten steel is condensed by the condensing lens 22 of the temp. measuring probe 10 and guided to a radiation thermometer 2 through the optical fiber 11. The radiation energy guided to the radiation thermometer receives photoelectric conversion in said thermometer to be converted to electric energy corresponding to the quantity of light and said electric energy is subsequently converted to a temp. value. By this method, the contact of the temp. measuring probe with the molten metal is prevented and said probe can be cooled so as not to be melted by the radiant heat from the molten metal.