Multi-jet nozzle for a steelmaking oxygen injection lance with divergent optimized Laval tuyeres for improved injection speeds

摘要

A multi-jet gas injection nozzle (10) comprises a generally asymmetric body (12) through which several adjacent tuyeres (14) are provided, extending between open leading (16) and trailing (18) ends defining a sense of circulation in the tuyeres. The tuyeres have their axis (Y-Y) angularly displaced with respect to the axis (X-X) of the body. The axes of the tuyeres diverge from each other from the leading end towards the trailing end of the tuyeres. Each tuyere includes, at its leading end, a convergent cone (30) following the sense of circulation and the cone is delimited by a truncated surface (38). The truncated surfaces of the adjacent convergent cones of the different tuyeres are secant. An independent claim is also included for a multi-jet gas injection lance equipped with this nozzle.