| 摘要 |
The invention relates to the field of metallurgy, in particular - to the structure of lance for melt blowing in the steel melting unit. The lance for melt blowing in the steel melting unit contains concentrically located pipes, which create channels for oxidizer supplying, injection and removal of refrigerant and multi-nozzle head with the cone nozzle of Laval, that have the convergent tube, minimal section and run-out with rectilinear generatrixes, which angle of backing-off is determined from the given ratios. As well as between the convergent tube and the run-out in the Laval nozzles cylindrical canals are carried out, which length is determined from the given ratios. Furthermore the the run-outs of the nozzles have additional cylindrical starting areas, which length is determined from the given ratios. The invention provides for increasing of effectiveness of the bath lancing of steel melt, increasing of durability and decreasing of material capacity of the lance, reduction of steel cost price.
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