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首页> 外文期刊>ISIJ international >Flow of Molten Slag through Coke Channels
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Flow of Molten Slag through Coke Channels

机译：熔渣流过焦炭通道

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In the lower zone of the ironmaking blast furnace, liquid iron and slag descend counter-current to reducing gases through a packed bed of coke. The characteristics of the flow of these liquids and their holdup influence product quality and furnace operation. The present study aimed to establish the criteria for the passage of slag through the narrow pore necks that form between coke particles. The flow of slag through coke pore necks has been simulated using an experimental technique that assesses slag flow from a funnel entering a narrow channel of known diameter. Synthetic coke was mainly used to minimise experimental uncertainty associated with the use of variable industrial coke and to allow control of the coke mineralogy. Industrial coke and graphite were also tested. Pellets of slag with compositions in the CaO–SiO_(2)–MgO–Al_(2)O_(3) system were melted in the coke funnels and heated to 1500°C under argon, then held at temperature for a certain time. After cooling, the passage of slag through the channel was determined and the interactions of the slag and coke were characterized. Variables assessed included slag composition, coke mineralogy and channel diameter.For the slags and cokes studied, the minimum channel diameter that allowed slag to flow was between 4.4 and 5.0 mm. For smaller diameters, slag did not flow through the channel. The flow mechanism was discussed in terms of a simple gravity and capillary/interfacial force analysis of the system.
机译：在炼铁高炉的下部区域，液态铁和炉渣与流经填充焦炭床的还原气体逆流下降。这些液体的流动特性及其滞留量会影响产品质量和熔炉操作。本研究旨在建立炉渣通过焦炭颗粒之间形成的狭窄孔颈的通过标准。渣通过焦炭孔颈的流动已经使用一种实验技术进行了模拟，该技术评估了来自漏斗进入已知直径的狭窄通道的炉渣流量。合成焦炭主要用于最大程度减少与使用可变工业焦炭相关的实验不确定性，并可以控制焦炭的矿物学。还测试了工业焦炭和石墨。在CaO–SiO_（2）–MgO–Al_（2）O_（3）系统中组成的矿渣球粒在焦炭漏斗中熔化，并在氩气下加热至1500°C，然后在一定温度下保持一定时间。冷却后，确定炉渣通过通道的通道，并表征炉渣与焦炭的相互作用。评估的变量包括炉渣成分，焦炭矿物学和通道直径。对于所研究的炉渣和焦炭，允许炉渣流动的最小通道直径在4.4至5.0 mm之间。对于较小的直径，炉渣不流经通道。通过简单的重力和系统的毛细管/界面力分析讨论了流动机理。

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