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北京科技大学与包钢合作开发了国内首家拥有自主知识产权的大方坯连铸动态二冷与动态轻压下控制模型。模型将铸流离散成许多切片,依据传热学理论与合理假设对每个切片建立传热微分方程;通过用有限差分法求解各切片传热微分方程,动态计算各切片的内部温度曲线,从而实现对铸坯实时温度场的动态跟踪;结合目标表面温度控制法与轻压下理论实现了大方坯连铸的动态二冷与动态轻压下控制。该控制模型已在包钢5号大方坯连铸机上线应用,对比试验表明铸坯内质得到了明显提升。
Beijing University of Science and Technology and Baotou Steel have jointly developed the first control model of dynamic bloom and dynamic soft reduction for bloom casting with independent intellectual property rights in China. The model discretes the flow into many slices, and establishes heat transfer differential equation for each slice according to heat transfer theory and reasonable assumption. By using the finite difference method to solve the heat transfer differential equation of each slice and dynamically calculates the internal temperature curve of each slice, The real-time temperature field of the slab is tracked dynamically. Combined with the control of the target surface temperature and the theory of soft reduction, the dynamic secondary cooling and the dynamic control of the slab continuous casting are realized. The control model has been applied to Baosteel No.5 bloom caster, and the comparative tests show that the quality of the billet has been significantly improved.