气淬高炉熔渣冷却凝固相变特性仿真

为了探究实际喷吹参数对渣珠内部凝固换热过程产生的影响,研究了不同喷吹速率和渣珠粒径参数下、高炉渣珠落到冷渣器时、渣珠内部温度场及固液相变规律,获得了不同气淬参数对高炉渣气淬渣珠冷却过程中换热情况的影响。结果表明,气淬高炉熔渣能够加快渣珠表层凝固形成固态渣壳,但是整个凝固过程并不均匀。随着喷吹速率的增大,渣珠凝固速度增快,渣壳形成时间缩短;粒径越小,渣珠换热速度越快,发生完全凝固时间越短。1 723 K出渣温度、350 m/s喷吹速率、粒径3 mm渣珠落入冷渣器时能够获得最快凝固速率,形成完整渣壳,同时节约能耗。

Phase transition simulation of air quenching blast furnace slag during cooling and solidification

To investigate the effect of actual air quenching parameter on the solidification heat exchange process inside the slag beads, the internal temperature distribution and solid-liquid phase transition law of the slag beads were studied under different air velocities and slag drops sizes when slag beads fell intothe slag cooler, and the influence of different air quenching parameters on heat exchange characteristics of air quenching blast furnace slag(BFS) in cooling process was obtained. The results show that air quenching of BFS can accelerate the solidification of slag bead surface to form the solid slag shell, but the whole solidification process is not uniform. With the increase of air velocity, the solidification of slag beads is accelerated, and the slag shell formation time is shortened. The smaller the slag beads diameter is, the faster the heat exchange rate of slag beads is, and the shorter the complete solidification time is. When the slag temperature, the air velocity and the diameter of slag beads are 1 723 K, 350 m/s and 3 mm, respectively, the fastest solidification rate is obtained, forming a complete slag shell, and saving energy consumption.