Об эффективности применения совмещенных процессов дуговой плавки и внепечной обработки стали в электросталеплавильных агрегатах ковш-печь с использованием локально распределенной системы дожигания горючих газов

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Steel production in the modern steelmaking shops is accomplished by powerful electric arc furnaces (EAF) followed by ladle treatment. This scheme of production requires considerable capital investments and is widely used at large steel-works. For small steelmaking shops of machine-building plants, mini- and micro-mills an electric steelmaking aggregate ladle-furnace (ESA-LF) was developed, combining electric arc melting and ladle treatment. Description of a design, equipment and steelmaking technology in ESA-LF presented. Melting of steel in it is accomplished out of DRI-based raw materials, which are supplied into high temperature zone of electric arcs action through hollow graphitized electrodes. It enables to increase productivity of the aggregate, to decrease the electric energy consumption and to increase steel yield. The supply of bulk slag-forming materials and deoxydizers is made through axis channels of the electrodes. For homogenization of the melt chemical composition and temperature a blowoff by argon or nitrogen from the bottom is envisaged. The proposed scheme of combustible off gases afterburning during both the bath blow by oxygen and during its supply through additional tuyere, installed in the gas-outlet, enables to get additional heat for smelting running. Calculations of heat balance by various variants of carbon oxide afterburning presented. Simulation of smelting process accomplished, depending on carbon content in the metal and methods of combustible gases afterburning. It was determined, that application of the proposed technologies enables to decrease electric energy consumption and heat duration.