180t Converter Five-hole Lance Numerical Simulation And Research

BOF steelmaking is today the major domestic and foreign steel-making methods.Lance important as the converter equipment, oxygen jet flow state is closely relatedto its impact on the situation and the molten iron bath smelting effect. With the largecapacity of the converter, oxygen lance nozzle from the hole develop into porous.Often exists between the porous oxygen lance nozzle out of the multi-jets withmutual interference, extremely complex flow field characteristics, most studiesremain in the experimental stage cold, but because of the various test conditions andexperimental researchers range, the results vary same. Therefore, the establishmentof a supersonic oxygen lance for porous mathematical model to study the complexissue of porous jet analog means to enrich oxygen lance jet theory, improved porouslance blowing process design and optimization has a very important significance.In this paper, a steel180t BOF lance for the study, combined with the actual siteproduction process, according to the classical theory lance design, by designcalculations to determine the five-hole oxygen lance nozzle structure parameters.Lance in order to design for the study, based on knowledge of aerodynamics andnumerical heat transfer theory, the choice of a suitable mathematical model, usingCFD fluid simulation software for calculation, simulation analysis orifice angle,ambient temperature and other factors on the jet centerline velocity jet offset suctionroll along, the impact of the law affecting the area. The results showed that:(1) Under the same ambient temperature,15°oxygen lance nozzle best,15°for optimal type lance orifice angle, a strong jet penetration, the effective impactarea, can meet the production needs;(2) With the ambient temperature increases, the speed of the jet stream decayslows, jet offset lower; center line of the jet can reach a top speed also increases;(3) At the same temperature, with increasing distance from the injection hole,from the jet impact area is increased. Under different temperature, the same positionof the impact area increases with increasing temperature;(4) As the temperature increases, the density of the surrounding medium isreduced, weakening the jet entrainment jet rigidity becomes large.