RH熔池内弱搅拌区特性的模拟研究

Research on Characteristics of the Dead Zones in RH Melt Bath with Simulation Methods

以某钢铁厂170 tRH精炼装置为原型,运用数值模拟的方法对其在不同吹气量、浸渍管内径、插入深度和真空度下的流场进行了模拟,并对熔池内弱搅拌区的分布和变化进行了分析。研究表明:大包熔池上部存在3个弱搅拌区。随着吹气量的增大,1区、3区区域迅速减小;2区先增大后减小,在100 m3/h时达到最大。增大浸渍管内径,1区、2区、3区区域减小,2区在两浸渍管中下方出现了一狭长的弱搅拌区。增大浸渍管插入深度,3个弱搅拌区增大,熔池液面处速度降低,趋于平稳。增大真空度,3个弱搅拌区略有减小。在降低弱搅拌区的几个因素中,吹气量影响最大,浸渍管内径次之,真空度最小。

Taking the 170 t RH refining equipment of a steel company as a prototype,a mathematical simulation of flow field in the RH is carried out to study the dead zones in the RH melt bath under different gas flow rates,inner diameter and immersion depth of snorkel and vacuum degree.The results show that there are three dead zones at the top of ladle.With the increase of gas flow rate,the dead zones 1# and 3# get smaller rapidly and the zone 2# gets larger at the beginning until the largest zone appears at 100 m3/h and then becomes smaller;with the increase of the diameter of snorkel,all the 3 dead zones get smaller and a long narrow dead zone forms below the two snorkels in zone 2#;the deeper the snorkel inserts,the larger the dead zones get and the more steady the surface of the ladle becomes.Among these operational parameters contributing to decreasing dead zones,the gas flow rate is the most influential factor,while the vacuum degree is the least.