ABSTRACT

In this work, a time-dependent thermodynamic AOD process model, TimeAOD3™, is proposed to be used as a prediction model at practice to reach the desired nitrogen level to lower the cost and carbon footprint. The model is developed from an existing model and integrated with Thermo-Calc®. The modelling results suggest a fairly good prediction when compared with production-scale heats. The relative error of dissolved nitrogen content during and after decarburisation is −0.05 < RE < 1.36 and −0.23 < RE < 0.29, respectively. Besides, most modelled dissolved N% are higher than the measurement during decarburisation. This is probably owing to the formation of high turbulence flow and CO gas bubble which can flush the dissolved nitrogen out of the bath at practice. Moreover, dissolved C%, Cr% in bath and Cr₂O₃%, CaO%, MgO% in slag, as well as bath temperature are also compared and studied.

摘要

在这项工作中，时间相关的热力学 AOD 过程模型 TimeAOD3™ 被提议用作实践中的预测模型，以达到所需的氮水平，从而降低成本和碳足迹。该模型由现有模型开发并与 Thermo-Calc® 集成。与生产规模的加热相比，建模结果表明了相当好的预测。脱碳过程中和脱碳后溶解氮含量的相对误差分别为-0.05 < RE < 1.36和-0.23 < RE < 0.29。此外，大多数模拟的溶解N％高于脱碳期间的测量值。这可能是由于在实践中形成的高湍流和 CO 气泡可以将溶解的氮冲出浴槽。此外，浴中溶解的C%、Cr%和Cr ₂ O_{还对渣中的3} %、CaO%、MgO%以及浴温进行了比较研究。