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通过数学物理模拟以及工业应用实践,研究了异型坯结晶器内单、双浸入式水口浇铸时流场特征及实际冶金效果,优化了双浸入式水口的设计参数。模拟研究结果表明,双浸入式水口浇铸有利于异型坯结晶器内流场的均匀性和对称性,避免了单水口浇铸时局部区域流体流动强烈现象,改善结晶器液面的稳定性和波动均匀性;双浸入式水口最优设计参数为底孔直径23 mm、腹向侧孔直径14 mm、翼向侧孔直径10 mm、侧孔倾角6°。工业实践表明,异型坯连铸双浸入式水口浇铸技术使结晶器内流场分布更合理,液渣层分布更均匀,结晶器粘结漏钢发生率下降32.8%,废品率降低20%,平均连浇炉数增加近3倍,提高了连铸生产效率。
Through mathematical and physical simulation and industrial application practice, the flow field characteristics and practical metallurgical effects of single and double submerged entry nozzles in blank mold are studied, and the design parameters of double submerged entry nozzle are optimized. The simulation results show that the double immersed nozzle is beneficial to the uniformity and symmetry of the flow field in the blank mold and avoids the strong fluid flow in the local area when the single nozzle is cast and improves the stability and fluctuation of the mold liquid surface The optimal design parameters of double immersed nozzle are bottom hole diameter 23 mm, ventral hole diameter 14 mm, wing side hole diameter 10 mm and side hole inclination 6 °. The industrial practice shows that the flow field distribution in the mold is more reasonable and the distribution of liquid slag layer is more uniform. The incidence of mold sticking and breakout in the mold decreases by 32.8% and the reject rate decreases by 20% Even the number of pouring furnace increased nearly 3 times, improve the continuous casting production efficiency.