高炉内渣铁焦界面润湿行为研究现状及展望

 高炉作为目前世界上最大的移动床式冶金反应器,保持高炉内良好的透气透液性是保证高炉稳定顺行的关键。高炉内部被软熔带分割开来,分为上部固体散料区和下部固液共存区,下部的固液共存区是决定高炉透气透液性和煤气流分布的重要区域,因此若想明晰高炉影响透气透液性的关键,必须对高炉下部固液共存区的反应进行全面研究。高炉高温区焦炭床与渣铁的相互作用行为是决定铁-焦-渣交互作用及高炉透气透液性的重要因素,调控好液态渣铁与焦炭床的润湿性变化,可以有效改善高炉内部的透气透液性,最终会影响高炉生产效率和稳定性。因此,明晰高炉内渣铁焦的界面润湿行为显得尤为重要。首先对界面润湿现象进行了概述;然后详细从铁水成分以及焦炭性质对铁-焦界面润湿行为的影响进行了总结;其次详细分析了炉渣温度、炉渣成分以及焦炭自身性质对渣-焦界面润湿行为的影响。结果表明,目前高炉内渣铁焦界面润湿行为的研究已经从实验室试验以及基础模拟方面进行了研究,研究结果可为高炉操作者理解高炉内渣铁焦界面润湿行为提供初步理论指导,但仍需在可反映高炉内实际复杂情况的润湿行为变化方面进行深入研究。

Research situation and prospect of interfacial wetting behavior of iron-coke-slag system in blast furnace

As the blast furnace is currently the world′s largest moving bed metallurgical reactor, maintaining good gas and liquid permeability in the blast furnace is the key to ensuring the stability of the blast furnace. The interior of the blast furnace is divided by the cohesive zone, divided into an upper solid bulk area and a lower solid-liquid coexistence area. The lower solid-liquid coexistence area is an important area that determines the gas permeability and gas flow distribution of the blast furnace. Therefore, a comprehensive study of the reaction of the solid-liquid coexistence zone in the lower part of the blast furnace is the key to clarifying the gas and liquid permeability of the blast furnace. The interaction between the coke bed and liquid iron/slag in the high-temperature zone of the blast furnace is an important factor that determines the iron-coke-slag interaction and gas and liquid permeability of the blast furnace. Adjusting the wettability changes of the liquid iron/slag and coke bed can effectively improve the gas and liquid permeability, which will ultimately affect the production efficiency and stability of the blast furnace. This article first summarizes the interfacial wetting behavior, and then summarizes the effects of liquid iron composition and coke properties on the iron-coke interfacial wetting behavior. Secondly, the effects of temperature, slag composition, and coke′s properties on the wetting behavior of the slag-coke interface are analyzed. The results showed that the current research on the wetting behavior of the slag-iron-coke interface in the blast furnace has been studied from laboratory experiments and basic simulations. It can provide preliminary theoretical guidance for blast furnace operators to understand the wetting behavior of the slag-iron-coke interface in the blast furnace. However, it is still necessary to conduct in-depth research on the changes in wetting behavior that can reflect the actual complex conditions in the blast furnace.