四流小方坯中间包结构优化的物理模拟

随着钢铁工业的发展,人们对钢的质量要求越来越高,连铸中间包结构是和连铸坯最终质量形成相关的一个重要因素。试验以某厂四流小方坯中间包为原型,1∶3的比例制作了有机玻璃水模型,在不同的中间包结构下,KCl做示踪剂,采用"刺激—响应"技术测得流体的平均停留时间;黑墨水做显示剂显示流场。试验结果表明:采用"V"型挡墙开两孔时,钢液的平均停留时间短,滞止时间短,死区体积比例大。"V"型挡墙只开上孔时,能够很好的优化中间包,改善钢液的流动状态,使钢液的平均停留时间延长58.85 s,死区体积比例减小10.06%;同时还保证了各流之间的均匀性,即各流之间的温度、成分差异较小。

PHYSICAL SIMULAITON OF TUNDISH STRUCTURE OPTIMIZATION FOR FOUR-STRAND SMALL BILLET

The structure of continuous casting tundish is one of the important factors concerned with end quality of casting billet. It is done the test： taking the tundish of four - strand small billet casting of some plant as prototype to make a plexiglass water model with 1：3 ratio; under different tundish structures, with KC1 as tracer and adopting stimulus - response technique, the average residence time of fluid is measured; with black ink as display agent to display flow field. It is showed from the test that if opening two holes on V - shape stopping wall the average residence time of steel fluid is short and stagnant time also short, and volume ratio of dead zone large; whereas if just opening one lower hole the tundish can be well optimized, improved flow ability of steel fluid, the average residence time of steel fluid longer by 58.85 seconds, volume ratio of dead zone reduced by 10.06 percent, and it can guarantee uniformity between various strands, that is, there are smaller differences between strands in temperature and composition.