通过建立球形熔渣凝固过程的物理和数学模型,利用现代CFD设计软件FLUENT对不同粒径渣粒的凝固过程进行了数值模拟,得到了凝固过程中渣粒和周围气体的温度场,从而确定了渣粒完全凝固的时间,为熔渣粒化和余热回收设备的设计提供了理论基础.结果表明:渣粒初始温度1 823 K,渣粒直径为1～3 mm,冷却气体温度为373 K,冷却气体流速为1～20 m/s时,液态钢渣相变过程在2 s内释放出80%以上的热量.说明在氮气冷却条件下,只要保证一定的冷却时间,即可保证钢渣余热回收.
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