Modelling of Electric Arcs for Industrial Applications, a Review

H. Haraldsson, Y. A. Tesfahunegn, M. Tangstad, G. Sævarsdóttir
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引用次数: 1

Abstract

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 behaviour enables better control of furnace operation. Modelling 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). There are also simpler approaches to arc modelling, either based on simplified physical principles or empirical behaviour. A number of MHD models for electric arcs have been presented in the literature, but most of them involve simplifications such as axial-symmetry to reduce the simulation time, pertain to currents much lower than for industrial arcs, focus on DC arcs rather than arcs carrying AC current or do not have the plasma properties of the actual gas in the furnace. In a recently started project, the ambition is to create a full-scale 3D MHD model for an industrial AC arc at the conditions to be found in Si-metal furnaces. As much can be learned from previous arc modelling, this paper will review different arc modelling approaches and develop a classification framework to categorize the modelling methods, both the more intricate MHD models as well as the simpler modelling approaches. Among the available simplified models, one will be selected and coupled with a submerged arc furnace electrical circuit model. The complete circuit model parameters such as resistances and inductances are updated using a 3D submerged arc furnace that has been developed in ANSYS Maxwell using an eddy current solver.
工业应用电弧建模研究进展
电弧是在埋弧炉(SAFs)中进行的许多工业过程中必不可少的热源。电弧表现出非线性的电特性和复杂的行为方式。因此,更好地了解它们的行为可以更好地控制炉子的操作。工业电弧的建模是一个多物理场过程,涉及同时解决几个耦合的物理现象,如电磁学、流体动力学和传热,包括等离子体电弧的辐射传热。流体动力学和电磁学的耦合被称为磁流体动力学(MHD)。也有更简单的弧线建模方法,要么基于简化的物理原理,要么基于经验行为。文献中已经提出了许多电弧的MHD模型,但大多数模型都涉及简化,例如轴对称以减少模拟时间,适用于比工业电弧低得多的电流,侧重于直流电弧而不是携带交流电流的电弧,或者不具有炉中实际气体的等离子体特性。在最近开始的一个项目中,目标是在硅金属炉的条件下为工业交流电弧创建一个全尺寸的3D MHD模型。由于可以从以前的电弧建模中学到很多,本文将回顾不同的电弧建模方法,并开发一个分类框架来对建模方法进行分类,包括更复杂的MHD模型和更简单的建模方法。在现有的简化模型中,将选择一个模型并与埋弧炉电路模型耦合。利用ANSYS Maxwell中开发的三维埋弧炉,利用涡流求解器对电阻和电感等完整电路模型参数进行了更新。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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