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为解决连铸生产过程中因拉速、过热度等工艺条件频繁波动而导致铸坯凝固末端发生变化,使得末端电磁搅拌(FEMS)难以产生稳定良好的搅拌效果的问题,提出一种FEMS综合控制模型。此模型通过在线凝固传热模型计算得到FEMS安装处的坯壳厚度SF,然后采用基于目标坯壳厚度控制的二冷模型调节二冷水量使SF保持稳定,并根据不同的SF调节FEMS的电流和频率,使FEMS的使用效果达到最优值。采用射钉试验验证了数学模型的计算精度。计算机模拟及现场应用的结果表明,在160mm×160mm小方坯连铸机上,此综合控制模型能够使FEMS安装处的坯壳厚度保持稳定,目标坯壳厚度设定为52mm时,有效提高铸坯的内部质量。
In order to solve the problem that the end of the solidification of slab changes due to the frequent fluctuation of the process conditions such as drawing speed and superheat in the continuous casting process so that the end electromagnetic stirring (FEMS) can not produce a stable and good stirring effect, a FEMS integrated control model. In this model, the SF of the shell at the FEMS installation is calculated through the on-line solidification heat transfer model. Then the secondary cooling water model based on the target shell thickness control is used to adjust the secondary cooling water to make the SF stable. The FEMS adjusts the current of the FEMS and Frequency, the use of FEMS to achieve the best value. The nailing test is used to verify the accuracy of the mathematical model. The results of computer simulation and field application show that in the 160mm × 160mm billet caster, this integrated control model can keep the thickness of the shell at FEMS installation stable. When the target shell thickness is set to 52mm, The internal quality.