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Abstract

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Electric arc furnaces (EAFs) are unbalanced, nonlinear and time varying loads, which can cause many problems in the power system quality. In steel industries, the two arc furnaces often perform in parallel and stand on a single bus, which surely deteriorate the power quality. In this paper, in order to study and analyze the harmful effects of parallel operation of EAFs, first, a three phase arc furnace model, which can simulate all the operational conditions of EAFs are simulated based on Hyperbolic-Exponential Model. In this process, in order to perform exact analysis of EAFs, effects of arc furnace transformer and the mutual inductance of the flexible cables are also considered. In the next step, in order to improve the power quality indices, the TSC and TCR/FC compensators are designed optimally and then simulated. Finally, the simulation results that are accomplished by PSCAD/EMTDC software show the validity of the proposed method in the entire power systems.

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In the current study fume extraction systems are studied numerically and the effect of various parameters as fresh air inlet gap size, fume temperature and composition as well as the dust size is investigated. To aim this goal a precise 3D model of the entire system and proper grid is generated and system of governing equations for the reactive turbulent two-phase flow is solved using a Finite-Volume based code. The results confirm that although increasing the gap size may lead to a reduction in CO volume fraction, but an increase in products temperature is inevitable. Besides, it is shown that, despite the high efficiency of settling chamber in removing the large size particles (greater than 45 micron), it has a poor efficiency in eliminating the smaller size dust particles.