Numerical investigation of breakup process of molten blast furnace slag through air quenching dry granulation technique
作者机构：College of Metallurgy and EnergyNorth China University of Science and TechnologyTangshan 063210HebeiChina
出 版 物：《Journal of Iron and Steel Research International》 (Journal of Iron and Steel Research, International)
年 卷 期：2021年第28卷第1期
页 面：10-18页
核心收录：
学科分类：080602[工学-钢铁冶金] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学]
主 题：Breakup process Granulation mechanism Molten slag Air quenching Computational fluid dynamics
摘 要：Molten slag is broken up by supersonic air into droplets through the air quenching dry slag granulation *** breakup process of blast furnace slag directly determines the droplet diameter and the waste heat *** order to gain deep insight into the granulation mechanism and visualize the breakup process,three-dimensional unsteady numerical simulation based on the k-x based shear stress transport turbulence model was conducted to simulate the transient breakup process of molten slag(k is the turbulent kinetic energy,and x is the specific dissipation rate).The coupled level-set and volume-of-fluid method was utilized to capture the sharp air–liquid *** results show that a flat film is formed firstly under the effects of air impingement,recirculation zone and pressure ***,the axial wave and the spanwise wave appear simultaneously and the film is broken up into ligaments owing to the generation of vortex and hole structure at the intersection of axial trough and spanwise ***,the ligaments are broken up into droplets owing to Rayleigh–Taylor instability at the air–liquid *** droplets smaller than 3.00 mm account for 80%,with the average diameter of 1.95 mm.
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