Effect of Lance Design on Jet Characteristics in 250 t Converter

The supersonic jet characteristics of the oxygen lance nozzle play an important role in converter melting. However, limited studies have investigated the different nozzle arrangements to improve the jet characteristics. This study uses FLUENT to establish a compressible nonisothermal computational fluid model with a 250 t converter as the object, and the model first validates and then discusses the effects of the center hole and postcombustion (PC) oxygen lance secondary hole on the aggregation behavior and impact area of the oxygen jet based on the conventional five-hole oxygen lance. The study shows that, at the same distance, the influence of the peripheral jet offset degree from small to large is secondary hole-center hole-secondary hole with center hole. At the lance height of 1900 mm, compared to the traditional five-hole oxygen lance offset theoretical axial centerline distance is 1.98, 2.31, and 3.20 times. The larger the jet migration degree of the peripheral hole, the smaller is the velocity of the peripheral jet. The presence of center hole, secondary hole, and center hole with secondary hole encloses 1.04, 1.09, and 1.47 times the area enclosed by the conventional five-hole oxygen lance at 150 m s(-1) isovelocity line, respectively.

Automated summary

This study investigates the impact of different nozzle arrangements on the characteristics of oxygen jet using a computational fluid model. The study found that the offset degree of the secondary hole-center hole-secondary hole affects the jet behavior, and the migration degree of the peripheral hole influences the velocity of the peripheral jet.