DC –Furnace control philosophy in ferroalloys applications
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In this Master thesis is investigated the development of control system for ferroalloys applications. In the DC EAF technology is about to having a break through due to treason that more of the customers are ending up to invest in DC furnace instead of traditional AC furnaces. Also the continuously increasing environmental emission regulations are favoring the DC furnaces in addition to the fact that at mostly the smelters are located in very remote areas where electrical networks are often unstable. The work is divided into two parts. In the literature survey is firstly considered the history and comparing the difference of EAF furnaces which has been divided to AC and DC furnaces. In the chapter also the most common control practices and the function of DC furnace control philosophy is studied which then has work as the basis for developing the Pori ORC DC-furnace pilot project. Global markets for the electric arc furnaces are very small and few major companies has been developing DC furnaces continuously and therefore also lot of experience has been gained from these applications. In the second part of the thesis functional description and the equipments of Pori ORC are taken under the loop. At the end, final conclusions of the test trial are presented only from logic and control point of view and all the mechanical and metallurgical results are excluded.