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针对AOD(氩氧脱碳)过程提出了一个新的仿真模型,模型考虑了局部的变化,但仍然保证了计算的高效性。一个新的思路就是把AOD转炉作为流股区的活塞流反应器和熔池与表面熔渣的连续搅拌池反应器的组合来模拟。这种方法比之以前的模型有很多优点。首先,它提供了考虑气泡在流股中上升过程局部变化条件的有效方法。因为变量更少,相对于计算流体动力学(CFD)模型,这种构造使其能够非常高效地运算。模型的验证也更容易,因为它具有可被试验确定的特征。将模型与两种不同的试验(高Cr和低Cr钢种)情况进行了对比,结果表明,模型对脱碳和Cr行为的预测很好。利用模型输出结果可以获得主导机制的信息,更为重要的是何种元素主要参与氧的反应。模型给出了不同成分的元素如何在喷嘴附近区域首先发生氧化,之后又在熔渣上浮过程中被部分还原。模型同时包含了对氮行为的模拟,因此可以系统地用于优化脱氮。
A new simulation model is proposed for the AOD (Argon-Oxygen Decarburization) process. The model considers the local changes, but still guarantees the computational efficiency. A new idea is to simulate the AOD converter as a combination of a plug flow reactor and a continuous stirred tank reactor with molten slag and surface slag. This method has many advantages over the previous model. First, it provides an effective way to consider the local variation of bubbles in the ascending process of a stream. Because of the smaller number of variables, this configuration enables it to operate very efficiently compared to computational fluid dynamics (CFD) models. Model verification is also easier because it has features that can be experimentally determined. A comparison of the model with two different tests (high and low Cr steels) shows that the model predicts decarburization and Cr behavior well. The output of the model can be used to obtain the dominant mechanism of information, more importantly what kind of elements are mainly involved in the reaction of oxygen. The model shows how elements of different composition first oxidize in the vicinity of the nozzle and then partially reduce during slag floating. The model also contains simulations of nitrogen behavior and can therefore be systematically used to optimize denitrification.