The conventional electric arc furnace meltingprocess has been optimized in recent years to such an extent thatthe further necessary increase in melting capability can beachieved only with considerable complexity and financial input.The Contiarc scrap-melting technology developed by MDHtakes the form of a completely new technological meltingconcept which can be used to achieve melting rates comparableto those of BOF steel plants.The Contiarc melting furnace is a continuously operated fixedannular-shaft furnace with an electric-arc heating system located at its center.The main idea is to reduce the electrical energy consumption bycuffing energy losses. Additionaly the input of electrical energycan be reduced by introduction of primary energy.The energy-optimised mode of operation of the Contiarc furnacecuts energy losses by nearly 200 kWh/t. The process'sconsumption of electrical energy is now only approx. 250 kWh/twhen approx. 70 kWh/t is supplied by primary energy sources.The Contiarc furnace is completely gas-tight and thus fulfilseven the most stringent environmental protection regulations.Production of waste gas and dust has been significantly reduced.All emissions are captured.Production-cost advantages of approx. 20 DM/t steel areachieved over the modern AC electric arc furnace. A series oftests using a pilot furnace successfully demonstrated theviability of this processing concept. A demonstration plant isnow to be constructed in order to illustrate the suitability of theContiarc furnace for practical use.
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