120 t钢包底吹氩气物理模拟

为了优化国内某钢厂钢包的底吹位置和气体流量等工艺参数,更好地提高钢水洁净度,对120 t钢包建立1∶3水模型,模拟研究了底吹位置和气体流量对钢液混匀时间和钢渣覆盖情况的影响。结果表明,底吹位置不同时,混匀时间存在明显差异;随着气体流量增大,钢包混匀时间整体呈下降趋势,但减小幅度越来越小,吹气流量有最佳值;底吹位置为0.4R-0.6R,气体流量为500~700 L/min时,混匀时间由大到小的双孔角度为双孔135°＞双孔90°≥双孔120°;相同吹气量条件下单孔透气砖布置比双孔透气砖引起的钢渣卷入深度更大,深度差距基本为20~70 mm,而引起的渣眼面积大小则为双孔大于单孔。综合考虑混匀时间和钢渣覆盖情况,最优的透气砖布置和工况参数为双孔120°-0.4R-0.6R、气体流量500~600 L/min。

Physical simulation of 120 t ladle bottom blown argon gas

In order to optimize the process parameters such as the bottom blowing position and gas flow rate of the ladle of a domestic steel plant, and to better improve the purity of molten steel,a 1∶3 water model is established for a 120 t ladle in a domestic steel plant. Through physical simulation, the influence of bottom blowing positions and gas flow rates on the mixing time and the condition of steel slag coverage is analyzed. The results show that the mixing time is obviously different with different bottom blowing positions. With the increase of gas flow, ladle blending time integral is on the decline, but the decrease rate tends to small, blow air flow has a best value. When the bottom blowing position is 0.4R-0.6R, and the gas flow rate is between 500-700 L/min, the mixing time from large to small is double bricks 135°> double bricks 90°≥ double bricks 120°. Under the same air blowing capacity, the slag involvement depth caused by single brick is greater than that caused by double bricks, the depth difference is basically 20-70 mm, and the slag eye areas caused by double bricks are larger than that caused by single brick. Considering the mixing time and the condition of steel slag coverage, the optimal layout and operating parameters of the permeable brick are 120°-0.4R-0.6R with gas flow rate of 500-600 L/min.