Improvement of the smelting efficiency based on the use of composite nozzles in the oxygen lances of high-capacity converters

摘要

The nozzle designs of oxygen lances are proposed, which ensure the improvement of technical and economic parameters of converter smelting and metallurgical quality of steel. The developed solutions make it possible to ensure the operation of composite lance nozzles without possible erosion wear of the supercritical part of the nozzle with an acceptable off-design degree. The cylindrical nozzle allows the supersonic flow of oxygen to be stabilized, the length of the initial and transitional sections of the jet to be increased, which is important for organizing a "tough" blowing of the converter bath at the final stage of the operation in order to reduce the oxidation of metal and slag.