顶底侧吹转炉熔池搅拌混匀物理模拟

在实验室建立顶底侧吹转炉吹炼物理模型,实验研究了顶底侧吹工艺参数对顶底侧吹转炉熔池搅拌混匀的影响.结果表明,侧吹气体流量对熔池混匀时间有重要的影响,存在一个临界侧吹气体流量,在低于临界侧吹气体流量范围,随侧吹气体流量增加,熔池的水平搅拌作用逐渐增强,熔池的混匀时间随之下降,侧吹气体达到一定的侧吹气量临界值后,熔池混匀时间显著降低,进一步提高侧吹气量,熔池混匀时间不再有大的变化.应在保证足够的侧吹气体流量的前提下,尽量采用适当小断面的侧吹枪.合适的底吹供气强度有助于顶底侧吹转炉熔池搅拌混匀,顶枪枪位和顶吹气体流量的变化对顶底侧吹转炉熔池混匀影响不大

Physical Modeling of Stirring and Mixing in Bath of Top-Bottom-Side Blown Converter

With a physical model developed for the top-bottom-side (TBS) blown converters, the effects of blowing process parameters on stirring and mixing behavior in the converter bath were investigated experimentally. The results showed that the flowrate of side-blowing gas affects greatly the bath mixing time, and a critical value of side-blowing gas flowrate is found in the TBS blown converters. Horizontal stirring effect in the bath is intensified gradually and the mixing time is shortened when the side-blowing gas flowrate is increased but lower than the critical value. But, when the side gas flowrate reaches the critical value, the mixing time in the bath drops considerably and, with the side-blowing gas flowrate further enhanced, it no longer changes obviously. A side nozzle with small section area as possible is recommended under the precondition that large enough side-blowing gas flowrate can be provided. In addition, an appropriate bottom-blowing gas flowrate is beneficial to the mixing in the TBS blown converter bath, and the change of top lance height or top-blowing gas flowrate affects unobviously the mixing time in the TBS blown converter bath.