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Electrochemical Extraction of Fe–Si Alloy Form SiO2–CaO–CaF2–FeOx Slags by Molten Oxide Electrolysis 用熔融氧化物电解法电化学提取 SiO2-CaO-CaF2-FeOx 熔渣中的铁硅合金
Pub Date : 2024-08-05 DOI: 10.1007/s11663-024-03225-9
Xu Zhang, Liqi Zhang, Bowen Huang, Yusheng Yang, Zengwu Zhao

Materials like metallic iron and its alloys are essential to daily living and industrial production. The benefits of using electrolysis technology to prepare iron and its alloys are great efficiency, controllability, and environmental protection. This study focuses on the feasibility of the electrochemical method for the direct preparation of metallic iron and Si–Fe alloys in iron ores with high fluoride content. The electrochemical behavior of Fe(II) and Fe(III) in molten SiO2–CaO–CaF2 slag on tungsten electrodes was investigated by using cyclic voltammetry and square wave voltammetry methods. It was determined that the reduction of Fe(II) ions follows a one-step two-electron transfer process: Fe(II) + 2e → Fe(0). The reduction of Fe(III) involves a two-step electron transfer process: Fe(III) + e → Fe(II) and Fe(II) + 2e → Fe(0), respectively. The Fe(II)/Fe(0) process is an irreversible reaction controlled by diffusion. The diffusion coefficient of Fe(II) is DFe(II) = 1.5 × 10−6 cm2 s−1. The cathodic deposits of iron were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) combined with energy dispersive X-ray spectroscopy (EDS). The findings indicate that the production of Fe2Si alloy through electrolysis is more favorable when Fe(II) is present in the slag, while the production of metallic iron is more favorable when Fe(III) is present in the slag. This work provides a basis for the electrochemical direct preparation of Fe–Si alloy and metallic iron in high fluorine iron ore.

金属铁及其合金等材料对日常生活和工业生产至关重要。利用电解技术制备铁及其合金具有高效、可控和环保等优点。本研究主要探讨了在含氟量较高的铁矿石中采用电化学方法直接制备金属铁和硅铁合金的可行性。采用循环伏安法和方波伏安法研究了钨电极上熔融的 SiO2-CaO-CaF2 熔渣中 Fe(II) 和 Fe(III) 的电化学行为。结果表明,Fe(II) 离子的还原遵循一步双电子转移过程:Fe(II) + 2e- → Fe(0)。Fe(III)的还原涉及一个两步电子转移过程:分别是 Fe(III) + e- → Fe(II) 和 Fe(II) + 2e- → Fe(0)。Fe(II)/Fe(0)过程是由扩散控制的不可逆反应。Fe(II) 的扩散系数为 DFe(II) = 1.5 × 10-6 cm2 s-1。通过 X 射线衍射(XRD)、扫描电子显微镜(SEM)和能量色散 X 射线光谱(EDS)对铁的阴极沉积物进行了表征。研究结果表明,当熔渣中含有铁(II)时,更有利于通过电解生产 Fe2Si 合金,而当熔渣中含有铁(III)时,更有利于生产金属铁。这项工作为在高氟铁矿中电化学直接制备 Fe-Si 合金和金属铁提供了基础。
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引用次数: 0
Remelting Model and Cracking Criterion for Vacuum Arc Remelting of Superalloys: Taking IN718 as an Example 超合金真空电弧重熔的重熔模型和裂纹标准:以 IN718 为例
Pub Date : 2024-08-02 DOI: 10.1007/s11663-024-03222-y
Hengnian Zhang, Xin Li, Tao Zhang, He Jiang, Zhihao Yao, Jianxin Dong

To enhance the quality of vacuum arc remelting (VAR) ingots in enterprises, a remelting model and cracking criterion was developed based on simulation and a series of designed experiments to predict the segregation behavior, shrinkage cavity, thermal stress, and cracking tendency of VAR ingot. The remelting model was established by MeltFlow-VAR and Abaqus software. As MeltFlow-VAR cannot calculate the stress, through the secondary development program, the thermal stress of VAR ingot was calculated by introducing the temperature field of VAR process into Abaqus. This model was verified by longitudinal dissection of a 406 kg IN718 alloy VAR ingot. The simulated evolution of molten pool, shrinkage cavity, freckle formation probability and secondary dendrite arm spacing (SDAS) align consistently with the ingot microstructure and experimental results. Combined with thermal stress, the alloy strength at different temperature during cooling and solidification, and failure criterion, a crack criterion was constructed to predict the cracking tendency. Calculating the complete solidification time and cracking tendency of the VAR ingot after melting allows for the determination of the safe demolding time without cracks. This method can be used to explore the effect of different melting parameters, optimize VAR process and improve the quality of VAR production.

为提高企业真空电弧重熔(VAR)钢锭的质量,在模拟和一系列设计实验的基础上,开发了重熔模型和开裂标准,以预测 VAR 钢锭的偏析行为、收缩腔、热应力和开裂倾向。重熔模型由 MeltFlow-VAR 和 Abaqus 软件建立。由于 MeltFlow-VAR 无法计算应力,因此通过二次开发程序,在 Abaqus 中引入 VAR 过程的温度场来计算 VAR 钢锭的热应力。该模型通过对一块 406 千克的 IN718 合金 VAR 铸锭进行纵向剖分得到了验证。模拟的熔池演变、收缩空腔、雀斑形成概率和二次枝晶臂间距(SDAS)与铸锭微观结构和实验结果一致。结合热应力、冷却和凝固过程中不同温度下的合金强度以及失效准则,构建了裂纹准则来预测裂纹趋势。通过计算 VAR 钢锭熔化后的完全凝固时间和开裂趋势,可以确定无裂纹的安全脱模时间。该方法可用于探索不同熔化参数的影响、优化 VAR 工艺和提高 VAR 生产质量。
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引用次数: 0
In-Situ Observation of the Multi-phase Transition and Microstructure Evolution of 22MnB5 Steel 原位观测 22MnB5 钢的多相转变和显微结构演变
Pub Date : 2024-08-02 DOI: 10.1007/s11663-024-03223-x
Ce Liang, Guangxin Song, Wanlin Wang, Jie Zeng

An experimental investigation was conducted to elucidate the impact of cooling rate on the microstructure evolution of boron-containing steel 22MnB5 by in-situ observation using the confocal laser scanning microscope (CLSM). The observations manifested distinct multi-phase formation of reconstructive grain boundary allotriomorphic ferrite (GBA) and pearlite (P) to sympathetic intergranular acicular ferrite (IAF) and bainite (B), as well as the displacive martensite (M) under different predefined cooling rates (1, 10, and 20 °C/s). Notably, as the cooling rate escalated from 1 to 10 or 20 °C/s, the starting and finishing phase transition temperature decreased significantly. For the 22MnB5 steel cooled at 1 °C/s, the solid phase transition sequence followed γ→GBA→P→IAF, while for the steel cooled at 10 and 20 °C/s, the transition sequence shifted to γ→B→M. Additionally, in the sample cooled at 20 °C/s, the bainite lath spacing reduced and more small size martensite appeared as the mechanical stabilization of austenite. Simultaneously, the dislocation density increased compared to the slow cooled samples, primarily due to the elevated nucleation rate from austenite to ferrite and larger internal stress induced by the enhancing cooling intensity.

Graphical Abstract

通过使用激光共聚焦扫描显微镜(CLSM)进行原位观察,进行了一项实验研究,以阐明冷却速度对含硼钢 22MnB5 显微结构演变的影响。观察结果表明,在不同的预定冷却速率(1、10 和 20 °C/s)下,从重构晶界异形铁素体(GBA)和波来石(P)到共生晶间针状铁素体(IAF)和贝氏体(B)以及置换马氏体(M)形成了明显的多相。值得注意的是,随着冷却速率从 1 ℃/秒上升到 10 ℃/秒或 20 ℃/秒,起始相变温度和终结相变温度显著降低。对于以 1 °C/s 冷却的 22MnB5 钢,固相转变序列遵循 γ→GBA→P→IAF,而对于以 10 和 20 °C/s 冷却的钢,转变序列转向 γ→B→M。此外,在以 20 °C/s 冷却的试样中,贝氏体板条间距减小,出现了更多的小尺寸马氏体作为奥氏体的机械稳定剂。同时,与慢速冷却的样品相比,位错密度增加了,这主要是由于奥氏体向铁素体的成核率升高,以及冷却强度增加引起的内应力增大。
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引用次数: 0
Numerical Investigation of the Coupled Effect of H/D Ratio and Effective Volume on Optimized Blast Furnace Profile 高/低比和有效容积对优化高炉炉型的耦合效应的数值研究
Pub Date : 2024-08-02 DOI: 10.1007/s11663-024-03218-8
Junjie Li, Lulu Jiao, Shibo Kuang, Ruiping Zou, Wenqi Zhong, Aibing Yu

The design and optimization of blast furnace (BF) profiles generally rely on limited empirical knowledge and experience. Such exercise can now be improved by means of process modeling and optimization. In this work, the effect of furnace profile on BF performance is numerically investigated across a wide range of furnace volumes (500 to 6000 m3), focusing on the ratio of effective height to belly diameter (H/D ratio). This is done based on the recently developed 3D multi-fluid BF process model. The results indicate that the optimized H/D ratio under different furnace volumes can be determined by minimizing the total energy consumption, namely, the summation of chemical and physical energy consumptions. Comparative analysis indicates that the industrial data on the variation of H/D ratio with furnace volume, collected over years, can be reproduced quantitatively by the current model. The increase in BF size or volume results in high thermal energy efficiency and low coke rate, primarily attributed to the reduced heat dissipation from the top gas and furnace wall. But there exists a size threshold between small and large BFs, approximately 2000 m3 under the conditions considered. Beyond this threshold, the BF performance and in-furnace states do not change significantly. Optimum BF profile needs to consider the coupled effect of H/D ratio and effective furnace volume.

高炉(BF)炉型的设计和优化通常依赖于有限的经验知识和经验。现在可以通过工艺建模和优化来改进这种做法。在这项工作中,我们对高炉炉型对高炉性能的影响进行了数值研究,研究范围涵盖高炉容积(500 至 6000 立方米),重点关注有效高度与炉腹直径之比(H/D 比)。这项研究是基于最近开发的三维多流体 BF 工艺模型进行的。结果表明,在不同炉子容积下的优化 H/D 比可以通过最小化总能耗来确定,即化学能耗和物理能耗的总和。对比分析表明,目前的模型可以定量再现多年来收集的有关 H/D 比率随炉容积变化的工业数据。BF 尺寸或体积的增加会导致热能效率高和焦炭率低,这主要归因于炉顶煤气和炉壁的散热量减少。但在小型和大型 BF 之间存在一个尺寸阈值,在考虑的条件下约为 2000 立方米。超过这个临界值后,BF 的性能和炉内状态不会发生显著变化。最佳 BF 曲线需要考虑 H/D 比和有效炉体积的耦合效应。
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引用次数: 0
Numerical Simulation of Multi-physics Characteristics in Tundish with Channel Induction Heating 带通道感应加热装置的外容器中多物理特性的数值模拟
Pub Date : 2024-07-31 DOI: 10.1007/s11663-024-03211-1
Bin Yang, Shifu Chen, Hong Lei, Dazhao Gou

To investigate the qualitative and quantitative effects of flow rate on fluid dynamics within a tundish using channel induction heating, a mathematical model was developed to reflect the macroscopic transport phenomena. The simulation results show that as inlet velocities increased from 0.3 to 0.9, the ratios of plug zone volume to total volume, dead zone volume to total volume, plug zone to dead zone, and plug zone to mixed zone consistently fell within the ranges of 0.257 to 0.263, 0.118 to 0.119, 2.152 to 2.231, and 0.412 to 0.427. Concurrently, the inclusion removal rate in the tundish's dead zone under channel induction heating increased with the inlet velocity. Additionally, analysis of the mean characteristics in the tundish system reveals that the mean residence time linearly decreases with increasing mean flow temperature and linearly increases with the inlet velocity. Furthermore, the inclusion removal rate linearly increases with the inlet velocity. This work enables precise quantitative and qualitative predictions and analyses of physical parameters in the electromagnetic induction heating tundish at various casting speeds, providing an efficient method for evaluating and optimizing the multi-physical fields within the metallurgical container.

为了研究流速对使用通道感应加热的中间包内流体动力学的定性和定量影响,我们建立了一个数学模型来反映宏观传输现象。模拟结果表明,当入口速度从 0.3 增加到 0.9 时,塞区体积与总体积之比、死区体积与总体积之比、塞区与死区之比以及塞区与混合区之比始终保持在 0.257 至 0.263、0.118 至 0.119、2.152 至 2.231 和 0.412 至 0.427 的范围内。同时,在通道感应加热条件下,熔池死区的夹杂物去除率随入口速度的增加而增加。此外,对中间包系统平均特性的分析表明,平均停留时间随平均流动温度的增加而线性减少,随入口速度的增加而线性增加。此外,夹杂物去除率随入口速度的增加而线性增加。这项工作能够在各种铸造速度下对电磁感应加热中间包中的物理参数进行精确的定量和定性预测和分析,为评估和优化冶金容器内的多物理场提供了一种有效方法。
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引用次数: 0
Effect of Mold Oscillation on Multiphase Flow and Slag Entrainment in a Slab Continuous Casting Mold 模具摆动对板坯连铸模中多相流和熔渣夹带的影响
Pub Date : 2024-07-29 DOI: 10.1007/s11663-024-03219-7
Fu Zheng, Wei Chen, Lifeng Zhang

In the current study, a three-dimensional mathematical model that integrated the large eddy simulation (LES) turbulent model, volume of fluid (VOF) multiphase model, and the dynamic mesh model, was developed to investigate the influence of the mold oscillation on the steel, slag, and air multiphase flow and the slag entrainment in a slab continuous casting mold. The results indicated that the mold oscillation led to an increase of about 0.35 m/s in the speed of molten steel at the impact point of the upper and lower circulation on the narrow surface. However, it reduced about 0.047 m/s in the maximum speed of the meniscus at 1/4 width of the mold. The Fast Fourier Transform (FFT) analysis revealed that the characteristic frequency of the speed fluctuation in the gravity direction of the meniscus near the narrow surface was 1.27 Hz without the consideration of the mold oscillation. Upon the application of the mold oscillation, a new characteristic frequency of 3 Hz, matching the mold oscillation frequency, emerged with twice the intensity of the original 1.27 Hz frequency. Moreover, the mold oscillation had little effect on the characteristic frequency of the speed fluctuation on the meniscus far away from the narrow surface. A user-defined function (UDF) was employed to quantify the number, size, and spatial distribution of entrained slag droplets. The net slag entrainment rate was reduced from 0.0152 to 0.0113 kg/s after the consideration of the mold oscillation, and the number of entrained slag droplets was also decreased. The effect of mold oscillation on the size distribution of entrained slag droplets and the occurrence location of the slag entrainment on the meniscus were not significant.

本研究建立了一个集大涡模拟(LES)湍流模型、流体体积(VOF)多相模型和动态网格模型于一体的三维数学模型,以研究结晶器振荡对板坯连铸结晶器中钢、渣、空气多相流和夹渣的影响。结果表明,结晶器摆动导致狭窄表面上的上下循环冲击点处的钢水速度增加了约 0.35 m/s。但是,在模具 1/4 宽度处,半月板的最大速度降低了约 0.047 m/s。快速傅立叶变换(FFT)分析表明,在不考虑模具振荡的情况下,窄表面附近的半月板重力方向速度波动的特征频率为 1.27 Hz。在加入模具振荡后,出现了与模具振荡频率相匹配的 3 赫兹的新特征频率,其强度是原来 1.27 赫兹频率的两倍。此外,模具振荡对远离狭窄表面的半月板上的速度波动特征频率影响很小。采用用户自定义函数(UDF)来量化夹渣液滴的数量、大小和空间分布。考虑到模具振荡后,净夹渣率从 0.0152 kg/s 降至 0.0113 kg/s,夹渣液滴的数量也有所减少。模具摆动对夹渣液滴的大小分布以及夹渣在半月板上的出现位置的影响并不显著。
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引用次数: 0
Effect of the Al2O3 Content and MgO/Al2O3 Ratio on the Viscosity and Structure of CaO–SiO2–MgO–Al2O3-Based Furnace Slag with CaO/SiO2 = 1.2 Al2O3 含量和 MgO/Al2O3 比对 CaO-SiO2-MgO-Al2O3 基 CaO/SiO2 = 1.2 炉渣粘度和结构的影响
Pub Date : 2024-07-29 DOI: 10.1007/s11663-024-03220-0
Jianwei Song, Lei He, Tu Hu, Tingting Lv, Li Gao

The effects of the Al2O3 content and MgO/Al2O3 ratios on the structure and viscosity of CaO–SiO2–MgO–Al2O3 silicate-based slag were studied by the rotating cylinder method. The evolution of the silicate structure was analyzed by Fourier transform infrared spectroscopy. The results show that when the CaO/SiO2 ratio is 1.20 and the MgO content is 10 mass pct, the Si–O–Al structure and [AlO4]5− tetrahedron structure of the slag increase with increasing Al2O3 content (17 to 22 pct), which increases the viscosity, break-point temperature, and activation energy of the slag. In addition, when the CaO/SiO2 ratio is 1.20 and the Al2O3 content is 18, 20, and 22 mass pct, respectively, with the increase of MgO/Al2O3 ratio in the range of 0.4 to 0.7, the viscosity, break-point temperature, and activation energy of slag decrease. The analysis of the Raman spectra in the 800 to 1200 cm−1 range indicates that complex silicate structures ([Si2O5]2−, [Si2O6]4−) disaggregate into simpler structures ([Si2O7]6− and [SiO4]4−) with the MgO/Al2O3 ratio increase. The proportion of structural units Q3 and Q2 decreases, the proportion of Q1 and Q0 increases, and the proportion of silicate structural units (Q0 + Q1)/(Q2 + Q3) increases, which indicates that the non-bridging oxygen content in the slag increases, resulting in a decrease in slag polymerization.

采用转筒法研究了 Al2O3 含量和 MgO/Al2O3 比率对 CaO-SiO2-MgO-Al2O3 硅酸盐炉渣结构和粘度的影响。傅里叶变换红外光谱分析了硅酸盐结构的演变。结果表明,当 CaO/SiO2 比为 1.20、MgO 含量为 10 质量百分数时,炉渣的 Si-O-Al 结构和 [AlO4]5- 四面体结构随着 Al2O3 含量(17 至 22 质量百分数)的增加而增加,从而增加了炉渣的粘度、断点温度和活化能。此外,当 CaO/SiO2 比为 1.20,Al2O3 含量分别为 18、20 和 22 质量百分点时,随着 MgO/Al2O3 比在 0.4 至 0.7 范围内的增加,炉渣的粘度、断点温度和活化能均降低。对 800 至 1200 cm-1 范围内的拉曼光谱的分析表明,随着 MgO/Al2O3 比率的增加,复杂的硅酸盐结构([Si2O5]2-、[Si2O6]4-)分解为较简单的结构([Si2O7]6- 和 [SiO4]4-)。结构单元 Q3 和 Q2 的比例减少,Q1 和 Q0 的比例增加,硅酸盐结构单元(Q0 + Q1)/(Q2 + Q3)的比例增加,这表明炉渣中的非桥氧含量增加,导致炉渣聚合度降低。
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引用次数: 0
Sticking in Shaft Furnace and Fluidized Bed Ironmaking Processes: A Comprehensive Review Focusing on the Effect of Coating Materials 竖炉和流化床炼铁工艺中的粘结现象:以涂层材料的影响为重点的综合评述
Pub Date : 2024-07-26 DOI: 10.1007/s11663-024-03188-x
Rou Wang, Suneeti Purohit, Khadijeh Paymooni, Tom Honeyands

Production of direct reduced iron (DRI), particularly with green hydrogen, is a key pathway to the decarbonization of the iron and steel industry. However, the sticking tendency during the production of DRI creates serious operational issues and limits production outputs. Coating inert materials on the surface of iron ores can act as a barrier to effectively prevent the bonding between newly formed iron surfaces, and can interfere with the formation of iron whiskers. However, the principle of coating has not been systematically studied. This review covers the mechanism of sticking in both shaft furnaces and fluidized bed-based gaseous DRI production. The factors that influence the reduction kinetics and morphology, including physical and chemical ore properties, pellet induration conditions, and reduction conditions are summarized as well. Understanding the relationship between these factors and morphology change is critical to eliminating the sticking issues of DRI. Findings from this study suggest that coating with inert additives (e.g., metal oxides) can successfully prevent sticking in both shaft furnaces and fluidized bed processes. The types of additives and coating methods, the stage of reduction where the coating is applied, and reduction temperature will dramatically affect the coating performance. The outlook is discussed as well given the need for further work to improve the performance of coating (methods, timing, and cheaper alternatives), to further de-risk DRI technologies.

生产直接还原铁(DRI),特别是使用绿色氢气生产直接还原铁(DRI),是钢铁工业实现脱碳的关键途径。然而,直接还原铁生产过程中的粘连倾向造成了严重的操作问题,并限制了产量。在铁矿石表面涂覆惰性材料可以起到屏障的作用,有效防止新形成的铁表面之间的粘结,并能干扰铁须的形成。然而,涂层的原理尚未得到系统研究。本综述涉及竖炉和基于流化床的气态 DRI 生产中的粘附机理。还总结了影响还原动力学和形态的因素,包括矿石的物理和化学性质、球团压制条件和还原条件。了解这些因素与形态变化之间的关系对于消除 DRI 的粘结问题至关重要。本研究的结果表明,使用惰性添加剂(如金属氧化物)涂覆可成功防止竖炉和流化床工艺中的粘结。添加剂和涂层方法的类型、应用涂层的还原阶段以及还原温度都会极大地影响涂层性能。鉴于需要进一步改进涂层性能(方法、时间安排和更便宜的替代品)以进一步降低 DRI 技术的风险,我们还对前景进行了讨论。
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引用次数: 0
Study on Behavior of Slag Rim and Shell Initial Solidification at Meniscus in Continuous Casting Slab Mold 连铸板模中渣边和壳体在半月板处的初始凝固行为研究
Pub Date : 2024-07-25 DOI: 10.1007/s11663-024-03195-y
Zijian Wei, Zhihao Wang, Di Zhang, Yu Liu, Xudong Wang, Man Yao

Understanding the formation of a slag rim on the mold meniscus is crucial for controlling surface defects in the initial shell. However, there is a scarcity of quantitative studies on this matter. This study has developed a comprehensive three-dimensional (3D) numerical model for analyzing the meniscus multi-phase flow, heat transfer, and solidification, considering mold oscillation. The 3D morphology of the solidifying shell and the slag rim in the meniscus region were accurately reproduced. The solidification depth (DIS), solidification length (LIS) and oscillation mark depth (DOM) of the initial shell were used to quantify the morphological characteristics of the initial shell. The results confirmed that the formation position difference of the slag rim along the circumferential direction of the mold significantly affects the initial solidification and uniform growth of the shell. In the corner of the mold, the deeper overflow makes the oscillation mark extend 2.8 to 3.2 mm in the direction of casting. In addition, in order to quantitatively investigate the influence of the slag rim, a two-dimensional (2D) model is established with phenomena and parameters considered the same as those of the 3D model. According to the slag rim morphology obtained by the 3D model, in the 2D model, it is proposed to construct three slag rims with the same maximum thickness of 6 mm at 10, 20 and 35 mm above the meniscus (HRim). The simulation of initial shell morphology revealed that a lower formation position of the slag rim led to more severe overflow of molten steel from the meniscus, resulting in non-uniform continuous growth of the initial shell. This increases the likelihood of potential blockage in the liquid slag flow towards the slag channel between solidified shell and mold.

了解模具半月板上熔渣边缘的形成对于控制初始型壳的表面缺陷至关重要。然而,这方面的定量研究却很少。本研究建立了一个全面的三维(3D)数值模型,用于分析半月板多相流、传热和凝固,并考虑了模具振荡。该模型精确再现了凝固壳体和半月板区域熔渣边缘的三维形态。利用初始壳体的凝固深度(DIS)、凝固长度(LIS)和振荡标记深度(DOM)来量化初始壳体的形态特征。结果证实,渣缘沿模具圆周方向的形成位置差异显著影响了壳体的初始凝固和均匀生长。在结晶器的拐角处,较深的溢流使得振痕在浇铸方向上延伸了 2.8 至 3.2 毫米。此外,为了定量研究渣边的影响,建立了一个二维(2D)模型,其现象和参数与三维模型相同。根据三维模型得到的渣边形态,在二维模型中,建议在半月板(HRim)上方 10 毫米、20 毫米和 35 毫米处构建三个最大厚度相同(6 毫米)的渣边。对初始炉壳形态的模拟显示,炉渣边缘的形成位置越低,钢水从半月板溢出的情况越严重,导致初始炉壳的连续生长不均匀。这增加了液态熔渣流向凝固型壳和模具之间熔渣通道的潜在阻塞可能性。
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引用次数: 0
Modeling and Comparison Study of Industrial AC-Arcs 工业交流电弧的建模和比较研究
Pub Date : 2024-07-24 DOI: 10.1007/s11663-024-03214-y
Hákon Valur Haraldsson, Halldór Traustason, Yonatan A. Tesfahunegn, Merete Tangstad, Gudrun Saevarsdottir

Electric arcs are a necessary heat source in many industrial processes that take place in Submerged Arc Furnaces (SAFs). Arcs exhibit non-linear electrical characteristics and behave in a complex manner. Therefore, an improved understanding of their behavior enables better control of furnace operation. Modeling of industrial arcs is a multiphysics process that involves simultaneously solving several coupled physical phenomena, such as electromagnetics, fluid dynamics, and heat transfer, including a radiative heat transfer from the plasma arc. Coupling fluid dynamics and electromagnetics is known as Magnetohydrodynamics (MHD). For practical applications, however, there are also simpler approaches to arc modeling, either based on simplified physical principles or empirical behavior. In this paper, a combined Cassie–Mayr model (CMM) and a channel arc model (CAM) are implemented and coupled with a submerged arc furnace electrical circuit model. The complete circuit model parameters such as resistances and inductances are estimated using modeling of a full size furnace, and then, actual measurements from a SAF are used to validate the models by comparing current and voltage waveform. Both models are then used to estimate harmonic distortion in a SAF for different arc current ratios, which should help operators to estimate the arc current in real time thus be able to lower and raise the electrode to keep operating conditions constant.

电弧是在埋弧炉(SAF)中进行的许多工业流程所必需的热源。电弧具有非线性电气特性,行为复杂。因此,加深对其行为的了解有助于更好地控制熔炉的运行。工业电弧建模是一个多物理过程,涉及同时求解多个耦合物理现象,如电磁学、流体动力学和热传递,包括等离子体电弧的辐射热传递。流体动力学和电磁学的耦合被称为磁流体动力学(MHD)。不过,在实际应用中,也有基于简化物理原理或经验行为的更简单的电弧建模方法。本文实施了卡西-迈尔模型(CMM)和槽弧模型(CAM)的组合,并将其与埋弧炉电路模型相结合。利用全尺寸电弧炉建模估算电阻和电感等完整电路模型参数,然后通过比较电流和电压波形,利用电弧炉的实际测量结果验证模型。然后,这两种模型都可用于估算不同电弧电流比下 SAF 中的谐波失真,这将有助于操作人员实时估算电弧电流,从而能够降低或升高电极以保持操作条件不变。
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Metallurgical and Materials Transactions B
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