DEM-CFD Model Considering Softening Behavior of Ore Particles in Cohesive Zone and Gas Flow Analysis at Low Coke Rate in Blast Furnace
DEM-CFD Model Considering Softening Behavior of Ore Particles in Cohesive Zone and Gas Flow Analysis at Low Coke Rate in Blast Furnace
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DOI：
10.2355/isijinternational.52.1010
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发表时间：
2012-06
影响因子：
1.8
通讯作者：
Hiroyuki Kurosawa;Shouhei Matsuhashi;S. Natsui;T. Kon;S. Ueda,;R. Inoue;T. Ariyama
中科院分区：
文献类型：
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作者：
Hiroyuki Kurosawa;Shouhei Matsuhashi;S. Natsui;T. Kon;S. Ueda,;R. Inoue;T. Ariyama
由于软熔带对高炉内气体流动有很大的影响，软熔带的模拟被认为是一个重要的课题。在软熔带内，矿粒的软化熔融行为受上层载荷和温度分布的影响，矿粒的收缩使矿层压降显著增大。在这项研究中，考虑物理性质，如杨氏模量的粘性区模型的基础上开发的离散元方法，它可以跟踪在填充床中的众多颗粒的个别运动。为了确定适当的杨氏模量的矿石颗粒的粘性区，在负载下的软化试验的元素模型计算进行，特别注意的空隙率的变化。在离散元法和计算流体力学（DEM-CFD）模型中引入了杨氏模量的优化值。该模型直观地反映了内聚区附近气体流动的变化。这些结果与冷态模型实验和解剖高炉中观察到的炉料结构相似。利用该模型还分析了焦比对煤气流的影响。可以很好地识别低焦比条件下气体流量的变化。
Since the cohesive zone has a great influence on the gas flow in the blast furnace, modeling of the cohesive zone is considered to be an important subject. In the cohesive zone, the softening and melting behavior of ore particles is affected by the load from the upper layer and the temperature distribution, and the pressure drop of the ore layer increases remarkably due to shrinkage of the ore particles. In this study, a model of the cohesive zone considering physical properties such as Young’s modulus was developed on the basis of the discrete element method, which can track the individual motions of the numerous particles in a packed bed. To determine the appropriate Young’s modulus of ore particles for the cohesive zone, element model calculations for a softening test under load were carried out, with particular attention to change in the void fraction. The optimized value of Young’s modulus value was then introduced in the discrete element method and computational fluid dynamics (DEM-CFD) model. The changes of gas flow in the vicinity of the cohesive zone were visually expressed by this model. These results were similar to those of cold model experiments and the burden structure observed in the dissected blast furnace. The influence of the coke rate on the gas flow was also analyzed using the above model. The change in the gas flow under a low coke rate condition could be well recognized.