Characterization of Liquid Trickle Flow in Poor-Wetting Packed Bed
Characterization of Liquid Trickle Flow in Poor-Wetting Packed Bed
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DOI：
10.2355/isijinternational.55.1259
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发表时间：
2015-06
影响因子：
1.8
通讯作者：
S. Natsui;T. Kikuchi;R. Suzuki;T. Kon;S. Ueda,;H. Nogami
中科院分区：
文献类型：
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作者：
S. Natsui;T. Kikuchi;R. Suzuki;T. Kon;S. Ueda,;H. Nogami
减少钢铁行业的二氧化碳排放是一项重要的全球挑战，特别是在炼铁领域，因为预计减少高炉运营的趋势将强劲。在炼铁过程中，低碳操作与此问题相关，需要降低占碳输入量较大的焦炭比。然而，由于转向低焦比操作也会减少可用于确保气体渗透性的焦炭量，因此高炉的气流行为将会发生显着变化。特别是，由于熔化区的气流渗透率与块状区的气流渗透率相差很大，控制该区域对气流的影响很大。因此，准确了解熔体行为特征对于建设低碳高炉至关重要。 1）高炉既有交叉（气流与液流垂直）又有逆流（气流与液流方向相反）的流动工况，如图1所示。固体形成填充床，上炉存在固-气两相体系，下炉存在三相固-气-液体系。炉底的液相运动表明，炉渣和铁水在粘性区形成，并通过焦炭填充床滴落到达炉底。该过程中液相的流动是不良润湿填充床中液体滴流流的重新表征
Reduction of CO2 emissions in the steel industry is an important global challenge, especially in the field of ironmaking, as strong trends are foreseen towards reducing blast furnace operations. In the ironmaking process, a low carbon operation is linked to this problem, and reducing the coke rate, which accounts for the larger amount of carbon input, is necessary. However, as a shift to a low coke rate operation will also reduce the amount of coke available to secure gas permeability, significant changes in the blast furnace’s gas flow behavior will occur. In particular, as the gas flow permeability in the melting zone differs considerably from that in the lumpy zone, controlling this region has a large influence on the gas flow. Thus, an accurate understanding of the melt behavior characteristics is vital for the construction of a low carbon blast furnace.1) Blast furnaces have both a cross (gas flow is perpendicular to the liquid flow) and counter-current (the gas and liquid flow are in opposing directions) flow conditions, shown in Fig. 1. The solids form a packed bed, while a two-phase solid-gas system exists in the upper furnace, and a threephase solid-gas-liquid system exists in the lower furnace. The liquid phase movement in the bottom furnace showed that the slag and molten iron formed in the cohesive zone and drip through a coke-packed bed to reach the furnace hearth. The flow of the liquid phase in this process is recCharacterization of Liquid Trickle Flow in Poor-Wetting Packed Bed