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Importance of the Penetration Depth and Mixing in the IRONARC Process

机译：IRONARC工艺中渗透深度和混合的重要性

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One of the most important parameters for gas injection into liquid baths is the penetration depth of the gas into the bath. This is due to that it strongly influences the flow structure and hence the stirring and plume behavior in metallurgical processes.The IRONARC process is a new energy efficient process for reduction of iron oxide to produce pig iron. The future goal is to continuously scale up the process to an industrial scale from the current pilot scale. In this process, gas is injected horizontally through a submerged nozzle into a slag bath. Hence, the penetration depth is of great importance since it greatly affect several parameters in this process. Moreover, this information is essential when scaling up the reactor from a pilot scale to an industrial scale.In this work, the penetration depth of gas injection into water in a small scale side blown converter was studied numerically. Two different approaches with different multiphase models were tested, namely the Volume of Fluid (VOF) model and Eulerian multiphase model (EE). The penetration depth could be accurately determined for both numerical models, with a small expected deviation of 13.9% from the physical experiment results. Also, the simulation time was shorter for the Eulerian multiphase model. The penetration depth was then determined for the IRONARC pilot plant process. The results show that the plume is detached from the nozzle wall, which in turn results in a better energy usage of the gas along with a small refractory wear.
机译：将气体注入到液槽中的最重要参数之一是气体向液槽中的渗透深度。这是因为它极大地影响了冶金过程中的流动结构，进而影响了搅拌和烟羽行为。IRONARC工艺是一种用于还原氧化铁生产生铁的新型节能工艺。未来的目标是将流程从当前的中试规模不断扩大到工业规模。在此过程中，气体通过浸没式喷嘴水平注入渣池。因此，渗透深度非常重要，因为它在此过程中会严重影响几个参数。此外，这些信息对于将反应堆从中试规模扩大到工业规模至关重要。在这项工作中，对小型侧吹转炉中注气到水中的渗透深度进行了数值研究。测试了具有不同多相模型的两种不同方法，即流体体积（VOF）模型和欧拉多相模型（EE）。可以精确地确定两个数值模型的穿透深度，与物理实验结果的预期偏差很小，为13.9％。此外，欧拉多相模型的仿真时间更短。然后确定IRONARC中试工厂工艺的渗透深度。结果表明，烟羽从喷嘴壁上脱落，这反过来又导致了气体的能量利用率更高，耐火材料磨损少。

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