APPARATUS AND PROCESS FOR REFINING MOLTEN STEEL IN THE PRODUCTION OF ULTRA-LOW CARBON STEEL

摘要

A MOLTEN STEEL REFINING APPARATUS AND A METHOD THEREFOR ARE DISCLOSED, IN WHICH THE CARBON COMPONENT OF MOLTEN STEEL CAN BE EASILY REMOVED, THE TEMPERATURE DROP OF MOLTEN STEEL CAN BE EFFECTIVELY REDUCED, AND A STABLE OPERATION IS REALIZED. THE APPARATUS FOR REFINING MOLTEN STEEL FOR MANUFACTURING ULTRA LOW CARBON STEEL ACCORDING TO THE PRESENT INVENTION INCLUDES AN RH VACUUM DEGASSING DEVICE CONSISTING OF A VESSEL (110) AND A SNORKEL (120) COMPOSED OF AN UP-LEG (121) AND A DOWN-LEG (122). THE APPARATUS FURTHER INCLUDES A PLURALITY OF GAS INJECTION LANCE NOZZLES (10) EACH CONSISTING OF AN INNER TUBE (12) AND AN OUTER TUBE (14), AND INSTALLED ON THE SIDE WALL OF THE VESSEL OF THE RH VACUUM-DEGASSING DEVICE SO AS TO INJECT GAS TOWARD MOLTEN STEEL WITHIN THE VESSEL. THE INNER TUBE (12) INCLUDES A THROAT (17) FOR FORMING A JET STREAM OF SUPERSONIC VELOCITY, AND THE OUTER TUBE (14) INJECTS COOLING GAS FOR COOLING THE INNER TUBE. FIGURE 7