PROSPECTIVE DESIGN OF AN OXYGEN FORM FOR CONVERTERS OF OAO EVRAZ ZSMK CAPACITY OF 350 T

Abstract

Oxygen Converter Shop No. 2 at EVRAZ ZSMK is the only shop in the CIS to utilize four-nozzle oxygen tuyeres for oxygen blowing in large-capacity converters (350 t capacity). The blowing mode is determined by the blowing intensity (flow rate of 1200–700 m³/min) and the tip design, which includes Laval nozzles with a critical diameter of 54 mm, positioned circumferentially at an angle of 15º to the vertical tuyere axis. This tuyere design enables the unit to operate under "overblowing" conditions and significantly reduces metal and slag oxidation during the final stage of converter bath blowing, ensuring a carbon concentration in the metal semi-finished product of less than or equal to 0.05%, which positively impacts deoxidizer savings. At the same time, a characteristic feature when using lime-magnesia fluxes in the main period of blowing is the difficulty in forming foamed slag of the required basicity and fluidity with an increased content of magnesium oxides, which helps to reduce the wear of the periclase-carbon lining of the converter.