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依据改变水口侧孔射流方向来控制结晶器内钢流流动状态的思想,设计了一种大方坯连铸结晶器新型四分切向水口.对不同类型水口(直通式、四分径向以及四分切向水口)浇注条件下大方坯连铸结晶器内钢水流动形态和温度分布状况进行了流体动力学比较研究.结果表明,新型四分切向水口不仅可以使结晶器内钢水形成上、下两个回流,并能够产生较强的水平旋流.该水平旋流能降低钢水的冲击深度,抑制钢液面波动,促进夹杂物上浮,还具有促进钢水过热耗散的效果.与四分径向水口相比,新型四分切向水口能减弱射流对初生坯壳的冲击,均匀横截面坯壳厚度.此外,该旋流状态使热中心上移,自由液面附近钢水的温度可提高2～6℃,改善化渣条件.
According to the idea of changing the jet flow direction in the side of the nozzle to control the flow state of the steel flow in the mold, a new type of billet nozzle for billet continuous casting mold was designed.According to different types of nozzles (straight, quarter and radial Tangential to the nozzle) under pouring conditions, the flow pattern and temperature distribution of the molten steel in the bloom continuous casting mold were compared.It shows that the new four-point cutting nozzle can not only form the upper and lower molten steel in the mold Two backflow, and can produce strong horizontal swirl.The horizontal swirl can reduce the impact depth of molten steel, inhibit the fluctuation of molten steel surface, promote inclusions floating, but also has the effect of promoting overheating and dissipation of molten steel. Compared to the nozzle, the new four-way nozzle can reduce the jet impact on the primary shell, uniform cross-section shell thickness.In addition, the swirling state makes the thermal center up, the molten steel temperature near the free surface can be increased by 2 ~ 6 ℃, to improve slag conditions.