共查询到17条相似文献,搜索用时 250 毫秒
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提出了一种基于带有变异算子的改进粒子群算法对二冷区水量进行优化的新方法。首先应用凝固原理和时空有限体积法建立连铸板坯凝固传热的数学模型,数值模拟结果与现场实测结果相符。再利用改进粒子群优化算法对二冷区各段的水量进行优化,优化之后的二冷制度使铸坯各段表面温度冷却速率和温度回升速率趋于平缓,与冶金准则对改善铸坯冷却过程和提高产品质量的要求相吻合。 相似文献
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建立连铸坯凝固传热数学模型,利用现场实测数据对所建模型进行了验证,并对影响铸坯温度和坯壳厚度的拉坯速度、浇注温度、二冷区水量等因素进行了分析。结果表明:模型的计算精度满足实际生产的需要,影响因素中,拉坯速度和二冷区水量对铸坯温度和坯壳厚度的影响最大。因此调节拉速,改善二冷区制度是铸坯生产工艺中的重要操作。 相似文献
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结合实际情况,利用偏微分方程建立了连铸圆坯凝固传热数学模型。通过测量圆坯表面的实际温度和开展射钉试验对数学模型进行了修正,提高了数学模型的准确性。结果表明,应用修正的数学模型可以近似模拟整个铸机的传热凝固过程;根据射钉和数值模拟结果,将末端电磁搅拌位置从距离弯月面16.2 m前移至15.0 m;末端电磁搅拌位置优化后,准380 mm连铸圆坯的中心碳偏析指数由优化前的0.984降低到优化后的0.966,缩孔级别由优化前的2.5级降低到优化后的0.5级,内部质量得到了明显改善。 相似文献
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《Journal of Materials Processing Technology》2014,214(1):44-49
An integrated approach was proposed for determining the heat transfer coefficient, which combined inverse heat transfer calculation model with temperature measurement and pin-shooting experiment. Based on the roller-layout and spray nozzle distribution, the IHTP (inverse heat transfer problem) model was developed to calculate the secondary cooling heat transfer by means of non-linear estimate method. The method transformed the inverse problem of parameter identification into solution of optimization problem using evolutionary algorithm. With the help of temperature measurement and pin-shooting experiment, the whole procedure of the model solution for identification and application in continuous casting process was given. Simulation and experiment results in plant trial confirmed the efficiency of the method used. 相似文献
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关于连铸凝固传热数值模拟中钢液有效导热系数的探讨 总被引:1,自引:0,他引:1
在建立板坯连铸一维非稳态凝固传热数学模型的基础上,考虑到液相区的流动和传热状态随拉坯方向的变化,研究了有效导热系数与固相导热系数的比值m(λeff/λs)的处理方法对计算结果的影响。结果表明,在相同的二冷条件下,m取不同的常数对模型计算结果影响很大。在相同的二冷条件下,将m取为常数和取为随拉坯方向变化的变量都可以得到相同的液相穴深度,但二者的凝固壳厚度随拉坯方向的变化有一定的差别,并且出结晶器坯壳厚度差别较大。改变二冷条件,上述二者液相穴深度不再相等。因此,将m取为常数的处理方法是不合理的。 相似文献
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J. C. Ma C. S. Lu Y. T. Yan L. Y. Chen 《International Journal of Cast Metals Research》2014,27(3):135-140
The control of secondary cooling is extremely important for the quality of billet in the continuous casting. In order to minimise the variation in surface temperature and excessive reheating of billet, which have a considerable influence on the formation of cracks and other defects, a real time heat transfer model that can be used for simulation of varying casting operations was developed. In order to verify the dynamic performance of this model, a charge coupled device temperature measurement system that can eliminate the impact of the scales was presented. The actual shell thickness profile and billet temperature were calculated in real time by this model online and were taken into account to feedback control the casting process based on the desired target cooling pattern to improve the existing cooling system. The dynamic control system based on this model was developed and implemented on some caster, and the billet quality was obviously improved. 相似文献