Оп degree of converter waste gases afterburning in top-blown converters

The reasons and degree of converter waste gases afterburning in slag and gas cavity of the converter during blowing have been studied. The afterburning is connected with reflection of the circumferential part of an oxygen jet on its length from the nozzles output section to the metal melt surface because of ongoing streams of converter waste gases and slag layer. Thus oxygen assimilation degree because of the above mentioned factors decreases by 5-35 of % depending on regime parameters, the blowing devices design, portable properties of supersonic jets in the high-temperature gas cavity of the converter and melt, on the height of the tuyere arrangement above the melt etc. Afterburning is influenced with the gas jet and the liquid melt interaction at upper blowing which is various at different intensity of blowing and the height of the tuyere arrangement, that is laminar, transient or turbulent. It has been shown, that gas and melt interaction is also influenced with the probability of the disturbances from the surrounding atmosphere transfer into the jet. The proper analytical ratios that are necessary in order to be able to define the degree of the converter waste gases afterburning above the metal melt at interaction of reflected streams of an oxidizing agent, the converter waste gas and the metal melt have been shown. It has also been proved that the degree of afterburning decreases with growing intensity of blowing, the velocity of the oxidizing agent in the effective (isobaric) section, with increase of the nozzles diameter and number of nozzles reduction, descent of the tuyere and the distance from the jet root to the melt surface decrease