Performance of ironmaking blast furnace systems critically depends on the permeability of the cohesive zone which involves flow of reducing gas through a packed bed of fused ferrous and coke particles at high temperature. This study systematically investigated the effect of operating temperature on bed permeability for two different ferrous burdens - pellets, and pellets-sinter mixture supported on coke particles. To quantify the structural changes in the bed, interrupted tests at various temperatures were conducted and bed porosity was estimated using synchrotron X-ray computed tomography (CT) technique. Bed porosity showed decreasing trends with increasing temperature. A CT image based computational flow dynamics (CFD) model was developed which showed linearly decreasing trends of bed permeability parameter with increasing temperature indicating a significant loss of bed permeability in the high temperature cases. This behaviour was more pronounced for the pure pellet case compared to the mixed burden case.

中文翻译：

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基于黑色金属和焦炭颗粒熔床中的计算机断层扫描流动模型了解高炉的粘性区行为

炼铁高炉系统的性能关键取决于粘性区的渗透性，该粘性区涉及高温下还原气体流过熔融铁和焦炭颗粒的填充床。本研究系统地研究了操作温度对两种不同含铁原料（球团矿和焦炭颗粒负载的球团烧结混合物）床层渗透性的影响。为了量化床的结构变化，在不同温度下进行了间断测试，并使用同步加速器 X 射线计算机断层扫描 (CT) 技术估算了床的孔隙率。床层孔隙度随温度升高呈下降趋势。开发了基于 CT 图像的计算流动动力学 (CFD) 模型，该模型显示床层渗透率参数随温度升高呈线性下降趋势，表明在高温情况下床层渗透率显着损失。与混合负载情况相比，这种行为对于纯颗粒情况更为明显。