【摘要】 高炉渣熔滴在冷却过程中的结晶行为会降低其商业价值，为了研究不同冷却条件下熔滴的凝固行为特征，将熔滴的飞行模型以及高炉渣结晶模型相结合对熔滴的连续凝固过程进行了数值模拟研究。结果表明：熔滴粒径的增加会导致其表面结壳所需距离大幅度增加，冷却后的平均晶相含量也会增加，熔滴粒径通过影响内部导热速率与冷却均匀性，成为主导凝固行为与晶相生长的关键因素。5 mm熔滴在15 m/s初速度下，冷却全程不反熔需水平飞行16 m，当对流换热系数从70 W/（m2·K）提至150 W/（m2·K）时，所需距离缩短至12 m。冷却条件需相互匹配，即表面结壳时延长飞行距离可降低初级流化床内冷却强度要求，增大初级流化床内冷却强度能缩小造粒装置尺寸。更多还原

【Abstract】 The crystallization behavior of granulated blast furnace slag droplets during cooling reduces their commercial value. In order to investigate the solidification characteristics of droplets under varying cooling conditions, a numerical simulation of the continuous solidification process was performed by integrating a droplet flight model with an enthalpy-based slag crystallization model. The results show that an increase in droplet size leads to a significant increase in the distance required for surface crust formation, and also results in an increase in the average crystalline phase content after cooling. Droplet size becomes a key factor governing solidification behavior and crystalline phase growth by influencing internal heat conduction rates and cooling uniformity. A 5-mm molten droplet at 15 m/s initial velocity requires 16 m horizontal flight to avoid remelting during cooling; increasing the primary fluidized bed convective heat transfer coefficient from 70 W·m-~2·K-~1 to 150 W·m-~2·K-~1 shortens this distance to 12 m. Two-stage molten droplet cooling must be matched: extending flight distance during surface crust formation reduces bed cooling intensity requirements, while increasing bed cooling intensity decreases granulation device size.更多还原