五流梯形中间包结构优化

Study on Optimization of Flow Controlling Devices in Five-strand Trapeziform Type Tundish

利用数值模拟和水模实验对南京钢厂五流小方坯连铸机梯形连铸中间包进行了结构优化研究.研究结果表明,原型中间包由于冲击区距3,4流距离过短,存在明显的短路流,各流间钢水分配及响应时间等差别较大,死区体积分率高,平均高达44.5%.采用湍流控制器+围墙+导流坝组合控流装置后,3流和4流的响应时间明显增加,分别增加到11和13s,各流流动特性趋于一致,平均死区体积减小至29.1%.研究结果有利于促进连铸生产顺行和铸坯质量的提高.

Fluid flow process in five-strand trapeziform tundish at steelmaking plant, Nanjing Iron & Steel Co., was investigated by numerical simulation and water modeling experiment. The results showed that there was obviously short circuit flow in strands 3 and 4 due to short distance between these two strands and impact zones, and there was appreciate difference in minimal resident time among different strands, with large dead zone volume of 44.5% in average. By installation of the combined flow controlling device of turbulence inhibitor+baffles+dams, the minimal resident time of strands 3 and 4 was obviously increased to 11 and 13 s respectively, and the distribution of molten steel among each of the stands tended to uniform, with average dead volume deceased to 29.1%. It was considered that the research results would obtain stable operation conditions and improve the billet quality.