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首页> 外文期刊>ISIJ international >Permeation and Blockage of Fine Particles Transported by Updraft through a Packed Bed (Numerical Approach)
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Permeation and Blockage of Fine Particles Transported by Updraft through a Packed Bed (Numerical Approach)

机译：通过填充床（数值方法）通过上升流运输的细颗粒的渗透和堵塞

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As a method for reducing CO_(2) in blast furnaces, low-reducing agent ratio and large amount of pulverized coal is being carried out to reduce the amount of coke used and reduce the carbon input to the blast furnace and its operation cost. However, these operating methods increase the deposit amount of coke powder and unburned char generated in the blast furnace and decrease process efficiency. A three-dimensional numerical model is built and observed by the coupling system of DEM-CFD, performed to understand the principal factors that affected fine and gas permeability. Simulation is carried out in, where fine particles are injected simultaneously from the bottom of cylindrical packed bed, mimicking the experimental approach. The fine to packed diameter ration is given by 0.133≤Dp/dp≤0.162. At a larger diameter ratio, fine particles tend to concentrate at the bottom of the packed bed. In the case of lower particle diameter ratio, updraft gas will easy to permeate along with fine particles because of the existing of large open flow channels relative to fine diameter. Furthermore, no significant change in fine fraction transported to the upper area due to the change of gas velocities. In this present study, the effect of continuous fine particles injection and its effect on gas flow can be observed, where the gas flow avoiding the heavily concentrated area.
机译：作为在高炉中还原CO_（2）的方法，正在进行低还原剂比和大量粉煤以减少所用的焦炭量，并将碳投入减少到高炉和其运行成本。然而，这些操作方法增加了高炉中产生的焦炭粉和未燃烧的炭，降低了过程效率。通过DEM-CFD的耦合系统构建和观察三维数值模型，以了解影响细能和透气性的主要因素。在圆柱形填充床的底部同时注入微粒，从圆柱形填充床的底部注入模拟，模拟实验方法。填充直径率的精细给出0.133≤DP/dp≤0.162。在较大的直径比下，细颗粒倾向于浓缩在填充床的底部。在粒径较低的情况下，由于具有相对于细直径的大开口流动通道，易于渗透的上升气体易于渗透和细颗粒。此外，由于气体速度的变化，在上部区域输送到上部区域的细部分没有显着变化。在本研究中，可以观察到连续细颗粒注射的效果及其对气流的影响，其中气流避免浓缩区域。

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