侧顶复吹条件下AOD转炉熔池内流体流动的数学模拟:模型对纯侧吹过程的应用及结果

Mathematical Modeling of Fluid Flow in an AOD Converter Bath under Conditions of Combined Side and Top Blowing:Application of the Model to Simple Side Blowing Process and Results

应用提出的侧顶复吹AOD熔池内钢液流动三维数学模型的纯侧吹分量,对纯侧吹下120tAOD转炉及线尺寸为其1/4的水模型熔池内流体的流动分别作了模拟和估计,考察了侧枪数和枪位的影响.结果显示,该分量可相当可靠地模拟纯侧吹AOD熔池内液体的流动.在与多股气流的相互作用下,整个熔池液体处于活泼的搅拌和循环运动状态,无明显的死区.侧枪数和枪位的变化未改变熔池内气体搅拌和液体流动的基本特征,也不会改变熔池内液相湍动能和含气率的分布规律,但在给定的侧枪数和侧吹气量或给定的枪位和侧吹气量下,枪位或枪数的变化会使之局部改变.与7枪18o或22.5o及6枪22.5o下的情况相比,采用6枪27o可获得更均匀的液体流场及湍动能和含气率分布.

The fluid flow in the bath of a 120 t AOD converter and its water model with a 1/4 linear scale in the simple side blowing were modeled and predicted using the simple side blowing component of three-dimension mathematical model developed for the flow of molten steel in an AOD bath under the conditions of combined side and top blowing.The influences of side tuyere number and angle between each tuyere were examined.The results present that this component proposed on the basis of the gas？liquid two-fluid model can quite reliably model the fluid flow in an AOD bath with simple side blowing.Due to the interaction with the multiple gas streams,the liquid is in vigorous agitation and circulatory motion,without obvious dead zone in the whole bath.The changes in the angular separation between each tuyere and the tuyere number have not made the essential characteristics of gas stirring and liquid flow in the bath alter,and can not change the general distribution patterns of turbulent kinetic energy and gas holdup of the liquid in the bath,but can make them change locally.Relative to those of using 7 tuyeres at 18° or 22.5° and 6 tuyeres at 22.5°,the more uniform liquid flow field and distributions of turbulent energy and gas holdup can be reached by using 6 tuyeres at 27°.