Numerical Evaluation on Lower Temperature Operation of Blast Furnaces by Charging Carbon Composite Agglomerates
Numerical Evaluation on Lower Temperature Operation of Blast Furnaces by Charging Carbon Composite Agglomerates
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DOI：
10.1002/srin.200705853
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发表时间：
2007-01
影响因子：
2.2
通讯作者：
M. Chu;J. Yagi;H. Nogami
中科院分区：
文献类型：
--
作者：
M. Chu;J. Yagi;H. Nogami
本文重点评估低温炼铁操作。在滚道恒定热条件下，使用改进的多流体高炉模型对采用碳复合团聚体 (CCB) 装料和/或较低操作温度的高炉操作进行了数值检查。数值计算表明，CCB 装料操作下实现了较低的炉内温度水平。随着CCB充注，粘性区的位置下移，热储备区的温度降低。溶损、烧结还原和硅转移反应的热量需求的减少补偿了CCB还原和直接还原的热量需求的增加，并且提高了高炉的效率。因此，与不加CCB的常规操作相比，生产率提高，焦炭率显着降低，总还原剂率也趋于下降。因此，装填碳复合团块有助于提高高炉性能。此外，该模型预测，如果能够降低熔化和/或出钢温度，则可以实现更高的操作效率。低温炼铁创新技术在解决工程和经济评价问题后有望在工业高炉中得到应用。
This paper places emphasis on evaluating ironmaking operation at lower temperature. Blast furnace operation with carbon composite agglomerates (CCB) charging and/or lower operation temperature has been numerically examined using a modified multi‐fluid blast furnace model under constant thermal conditions of the raceway. The numerical calculation shows that a lower in‐furnace temperature level is achieved under the operation with the CCB charging. With CCB charging, the location of the cohesive zone shifts downward and the temperature of the thermal reserve zone decreases. The decrease in heat requirements for solution loss, sinter reduction and silicon transfer reactions compensates the increase in heat demands for CCB reduction and direct reduction, and rather improves the efficiency of blast furnaces. Consequently, the productivity improves, the coke rate shows a notable decrease and the total reducing agent rate also tends to decline compared with conventional operation without CCB charging. Therefore, charging carbon composite agglomerates contributes to the enhancement of blast furnace performance. Furthermore, the model predicts that higher operation efficiency is achieved if the melting and/or tapping temperature could be dropped. The innovative technology of lower temperature ironmaking is expected to be applied in industrial blast furnaces after resolving the problems in engineering and economic evaluations.