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Optimization of Secondary Cooling Water Distribution for Improving the Billet Quality for a Small Caster

机译：优化二次冷却水分配以提高小型铸机的钢坯质量

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In order to eliminate internal cracks and other defects of billet caused by improper secondary cooling water distribution for a small caster, a mathematical heat transfer model for billet continuous casting has been presented and solved by finite volume method. For calibrating model better, the surface temperature of billet has been measured by using high resolution CCD measurement system, which can effective eliminate the influence of randomly generated oxide scales for the surface temperature measurement. Then, the existing problems of the secondary cooling water distribution have been discussed and the secondary cooling water distribution of each zone has been optimized at key casting speeds. A new secondary cooling water distribution has been regressed and analyzed. This secondary cooling water distribution can increase the casting speed, minimize the reheating of billet, and minimize the wide fluctuations of secondary cooling water at higher casting speed region. This can improve the billet quality. Finally, the new secondary cooling water distribution has been applied on an actual small caster, it has shown that the billet defects have been decreased greatly and the quality of billet has been obviously improved.
机译：为了消除小型连铸机二次冷却水分配不当造成的内部裂纹和其他缺陷，提出了一种有限体积法求解连铸坯的传热数学模型。为了更好地校准模型，采用高分辨率的CCD测量系统对钢坯的表面温度进行了测量，可以有效消除随机生成的氧化皮对表面温度的影响。然后，讨论了二次冷却水分配存在的问题，并以关键的铸造速度优化了每个区域的二次冷却水分配。回归分析了新的二次冷却水分布。这种二次冷却水的分布可以提高铸造速度，最小化坯料的再加热，并最小化在较高铸造速度区域的二次冷却水的宽幅波动。这样可以提高坯料质量。最后，在实际的小型连铸机上采用了新的二次冷却水分配，这表明钢坯缺陷已大大减少，钢坯质量得到了明显改善。

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