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针对某钢厂250 t钢包底吹氩气过程进行水模型实验和数值模拟,考察了吹气量和渣层厚度对卷渣行为和吹气量、渣层厚度及透气砖透气性能对钢液裸露面的影响,分析了卷渣形成机理.结果表明,吹气量对卷渣形成具有决定性作用,吹气量控制在0.96 m3/h(对应实际流量69 m3/h)以下可避免卷渣;随着吹气量的增加,钢液裸露面积逐渐增大,当吹气量达到0.70 m3/h时,钢液裸露面积百分比约达14%,继续增大吹气量,其增加幅度变缓;随着渣层厚度的增加,临界卷渣吹气量和钢液裸露面积逐渐减小,以37 mm(对应实际渣厚150 mm)厚渣层覆盖,可有效防止钢液二次氧化;透气砖堵塞对钢液裸露面积影响较大,顶部钢液形成两不同大小的裸露亮圈,并加重对包壁耐材的冲刷与侵蚀,降低钢的洁净度.工艺优化后,钢包水口结瘤率降低至0.1%以下,且可降低生产成本.
A water model experiment and numerical simulation on the process of argon blowing at the bottom of a 250 t steel ladle were carried out. The effects of air blowing volume and slag thickness on the entrainment behavior and air blowing volume, the thickness of slag layer and the permeability of air permeable bricks on the exposed surface of molten steel The results show that the amount of air blown is decisive for the formation of entrainment slag, the amount of air entrainment is controlled at 0.96 m3 / h (corresponding to the actual flow rate of 69 m3 / h) Increase, the exposed area of molten steel gradually increased, when the blow volume reached 0.70 m3 / h, the percentage of molten steel exposed area of about 14%, continue to increase the amount of inflatable, the slow increase; as the thickness of the slag layer increases, the critical Volume of ladle slag and bare steel area gradually decreased to 37 mm (corresponding to the actual slag thickness of 150 mm) thick slag layer can effectively prevent the secondary oxidation of liquid steel; blockage on the permeability of the liquid steel exposed a greater impact, The top of the molten steel to form two different sizes of exposed bright ring, and increase the erosion of cladding wall erosion and erosion, reduce the cleanliness of the steel.Optimization of the process, ladle nozzle nodule rate reduced to below 0.1%, and can reduce production costs .