Development and optimization of heads design for four-jet oxygen lance made for high-capacity converters working in conditions of overblowing
Described is the method of calculating the parameters of gas jets and nozzles profile of oxygen lances for low-carbon metal melting in 350-ton converter of «Evraz ZSMK». The developed solutions provide work of composite lance nozzles without possible erosive wear of the supercritical part of nozzle with off-design of reasonable degree. Cylindrical nozzle provides stabilization of the supersonic oxygen flow, increase of the initial and transition areas of the jet, which is important in organization of «hard» lancing of converter bath at final stage of operation in order to reduce oxidation of metal and slag. The proposed design of oxygen lance nozzles improves feasibility and quality indicators of melts in low-carbon metal production.