Numerical Simulating for Phase-change Heat Transfer Process of Slag Granule
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摘要: 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。Abstract: The physical and mathematical models of solidification process of spherical molten steel slag granule have been established in this paper.The temperature fields of slag sphere and its outer gas could be calculated through the FLUENT software.Consequently, the solidification time of the slag sphere with different diameter could be gained.It is believed that the numerical simulated results would provide the theoretical basis for granulating molten slag and heat recovery equipment layout of molten slag.The numerical simulation results showed that liquid slag sphere could release more than 80% of the phase-change heat in 2 s when the initial condition as follows:the temperature of molten slag being 1 823 K, the diameter of granule being 1~3 mm, the temperature of cooling gas being 373 K, the velocity of gas flow being 1~20 m/s.It is concluded that there could not be conglutination between slag spheres after a certain of cooling time if the molten steel slag has been granulated to 1~3 mm spheres.
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