engleski

Analytical model of radiative heat transfer in electric arc furnace

Nowadays, electric arc furnaces (EAF) are used in steel plants both for melting and overheating of metals to a determined temperature over the melting point temperature (the liquidus), and for the metallurgic processes of refining and alloying. There are alternating current electric arc furnaces (AC EAF) and direct current electric arc furnaces (DC EAF). In conventional AC EAF, the material (scrap) is melted by electric arcs which establish between the tip of electrodes and scrap charged into the furnace. DC EAF is basically characterised by a single, centrally-located graphite electrode acting as a cathode, and by several bottom electrodes acting as anodes. Thus, along with electrodes, the most important part of EAF is the space (the bath)manufactured by refractory bricks, in which the melting process occurs. Over bath, the wall and roof panels are located. Today, in ultra high power EAF, water-cooled wall and roof panels are usually used. The previously used panels, lined with refractory brick, are modified today so that more than 90% of all furnaces are equipped with water-cooled panels. Various types of panels and different conditions during exploitation require serious analyses of heat transfer mechanism inside EAF, especially radiation. The poster presents the developed analytical model of radiative heat transfer in EAF - appropriate tool in designing new water-cooled panels, which can maintain a stable layer of slag on their surface as an insulator in all working conditions, at the same time minimising cooling water consumption, heat losses and increasing reliability and duration.

analytical model; radiative heat transfer; electric arc furnace

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