Characteristics Of Gas Jets Of Variable Angles Oxygen Lances And Their Impact On The Molten Bath

It has been showed in previous experiments that the oxygen lance with four variable angles isobvious better than that with four non-variable jet angles in the aspects of stirring ability, smeltingeffects and technical indicators. Taking the structure and technical indicators of Tangshan Iron&Steel’s50t converter and its oxygen lance into account, the jet flow from the oxygen lances withvariable and non-variable jet angles, respectively, and the impact of which on the molten steel hasbeen researched with the simulation of Fluent software in the thesis.According to the simulation with single phase, the influence regulation of the inclination angle onthe flow rate, syncretization distance and effective impact field has been confirmed. Thesyncretization distance of oxygen lance with variable inclination angles is commonly larger than thatwith non-variable inclination angles, which has largely lower the splashing amount from the furnacemouth. The syncretization distance of the gas jet H (11°/11.5°) is the largest, while the effectiveimpact field of the gas jet E (11.5°/12.5°) is the largest.According to the simulation with gas and molten steel, the statistical approach of calculating theweak stirring field ratio has been constructed. Comparing with the oxygen lances with the non-variable inclination angles, the stirring ability of those with variable inclination angles is higher andthe distribution of the flow rate of bath is evener. For the variable inclination angle lance, the weakstirring field ratio under the action of gas jet spayed from the lance with opposite jet angles being1°is lower and the the stirring ability of which becomes higher. Within the eight variable inclinationangles, the weak stirring field ratio under the action of the gas jet D (11°/12°) is the lowest.By monitoring the tracers’ density and the tracers’ capture ratio by the interface, the approach ofmixing time simulation on molten bath has been constructed. Compared with the non-variable jetangles lance, the mixing time of bath under the action of variable angles oxygen lances is shorter. Themixing time of bath under the action of oxygen lance with1°between two opposite angles is shorterthan that with0.5°. At the same lance level, the mixing time under the gas jet D is the shortest and itsstirring ability is the highest.