Analysis of Actual Blast Furnace Operations and Evaluation of Static Liquid Holdup Effects by the Four Fluid Model
Analysis of Actual Blast Furnace Operations and Evaluation of Static Liquid Holdup Effects by the Four Fluid Model
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DOI：
10.2355/isijinternational.38.246
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发表时间：
1998-03
影响因子：
1.8
通讯作者：
P. Austin;H. Nogami;J. Yagi
中科院分区：
文献类型：
--
作者：
P. Austin;H. Nogami;J. Yagi
本文的目的是扩展和验证先前提出的高炉竖井模型。该模型使用保守微分方程来分析同时四相运动、传热和化学。首先，本文描述了模型的一些增强功能。此后，根据来自不同高炉的多组运行和下降探针数据验证模型。计算出的温度场与在中速和高速 PC 注入下由下降探针测量的二维场表现出良好的一致性。最后，第三部分考虑了静态持液率对模型预测的影响。检查了静态持液率的三个相关性。对于所有相关性，当计算中包括静态持液量时，由于固体传输静态液体，流向滚道的净液体通量增加。此外，当静态滞留量减少可用于气流的体积时，气体速度增加，导致更大的气-固热传递。这增加了直接还原率和溶液损失，从而提高了预测生产率并降低了铁水和炉顶煤气温度。最后，对于预测滚道区域中大静态滞留的相关性，由于液态金属停留时间增加，硅向铁水的转移增加。
The purpose of this paper is to extend and validate a previously presented model of the blast furnace shaft. This model uses conservative differential equations to analyse simultaneous four phase motion, heat transfer and chemistry. First, the paper describes some enhancements to the model. After this, the model is validated against several sets of operational and descending probe data from various blast furnaces. The calculated temperature fields show good agreement with two dimensional fields measured by descending probes at both medium and high rates of PC injection. Finally, the third section considers the effect of including static liquid holdup on the model predictions. Three correlations for static liquid holdup were examined. For all correlations, when static liquid holdup was included in the calculations the net liquid flux towards the raceway increased due to the transport of static liquid by the solid. Further, as static holdup reduces the volume available for gas flow, the gas velocity increases causing greater gas-solid heat transfer. This increases the rates of direct reduction and solution loss, resulting in increased predicted production rates and decreased hot metal and top gas temperatures. Finally, for correlations that predict large static holdup in the raceway region, silicon transfer to hot metal is increased due to increased liquid metal residence times.