对现有连铸二冷区喷嘴布置进行分析，根据布置优化原则提出采用喷嘴水流密度数值叠加的方法，在拉坯方向和铸坯横断面方向上对喷嘴布置方式进行优化。其中，在铸坯横断面方向上，考虑了横向水流密度分布的不均匀性对铸坯凝固过程的影响，建立二维铸坯传热数学模型，仿真得到不同位置的铸坯断面凝固形貌，并比较了优化前后铸坯温度分布、凝固情况和铸坯质量。结果表明喷嘴布置方式优化后，二冷区铸坯在拉坯方向和断面方向上喷淋水区域内均匀冷却，周期性温度回升变小，表面温度能够均匀下降，保证了较好的铸坯内部质量。

Based on the existing research on nozzle arrangement method in secondary cooling zone of continuous casting, the method of superposed water flow density is put forward to optimize the nozzle arrangement at casting direction and transverse section of slab according to the optimization principle. The two-dimension heat transfer model is established. The solidification morphology of cross-section at casting direction is simulated with consideration of the influence of water flow density inhomogeneity on solidification process at transversal section, and the temperature distribution of slab, solidification process, and quality of slab are compared between before and after optimization. The results indicate that the surface temperature of slab is dropped equably after optimization, and the casting blank is cooling uniformly in the water springing zone so as to ensure better quality of the casting blank.

国家自然科学基金资助项目(50674109)