通道式感应加热中间包挡墙优化的物理模拟

特种钢连铸对配备了通道感应加热技术的中间包内钢液均匀性和洁净度有着严格的要求。以国内某钢厂四流双通道感应加热中间包为对象,采用物理模拟方法对无挡墙、V型和八字型挡墙方案下中间包的流场和停留时间(Residence Time Distribution, RTD)曲线进行对比分析,从而获得最佳挡墙和导流孔结构。研究结果表明,使用八字型挡墙的中间包在平均停留时间和死区体积分数方面相比V型挡墙有很大的优势,其中最优方案为采用八字型挡墙两个导流孔的方案A2,其平均停留时间为707.7 s,死区体积分数为11.86%,方案A2相比原型中间包、V型挡墙四个导流孔的方案B1和B2、V型挡墙两个导流孔的方案C1和C2平均停留时间分别延长了223.4 s、122.1 s、117.2 s、85.3 s、68.4 s,死区体积分数分别减小了18.28%、15.24%、14.59%、10.64%、8.52%。

Physical simulation on optimization of baffles in an induction heating tundish

The continuous casting process of special steel has strict requirements for the uniformity and cleanliness of liquid steel in the tundish equipped with channel induction heating technology. In this paper, aiming at the four-strand two-channel induction heating tundish of a steel plant in China, the flow field and Residence Time Distribution(RTD) curves in the tundish under the schemes of prototype (without a baffle), V-type baffle and trumpet-type baffle were investigated and compared by the water model experiments to obtain the optimum designation of baffle and diversion hole for the tundish. The research results showed that the tundish applying the trumpet-type baffle appears great advantages over the V-type baffle in terms of more average residence time and less volume fraction of dead zone. The optimum scheme is case A2, in which two diversion holes are applied on each wall of the trumpet-type baffle. The average residence time is 707.7 s, and the dead zone volume fraction is 11.86%. Compared to the cases of the prototype (without a baffle), the V-type baffle equipped with four diversion holes (Case B1 and Case B2) and two diversion holes (Case C1 and Case C2) on each wall, the average residence time under the Case A2 is prolonged by 223.4 s, 122.1 s, 117.2 s, 85.3 s, 68.4 s, and the dead zone volume fraction is reduced by 18.28%, 15.24%, 14.59%, 10.64%, 8.52%, respectively.