Cómo alcanzar el nivel más bajo de emisión de un horno de arco eléctrico en el mundo

• Autores: Henrik Naaby, Ole Abildgaard, Jorgen Dam Pedersen
• Localización: Residuos: Revista técnica, ISSN 1131-9526, Año nº 6, Nº 29, 1996, págs. 96-100
• Idioma: español
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• Resumen

  • With a starting point in the requisite of an improved internal work environment and an expected demand for very low dust emission limits for Danish Steel Works Ltd (DDS), the furnace off-gas from the two 110t EAF' s was led to a new filter system with a continuously registered exhaust through a stack. At the same time a survey was carried out regarding formation and possible removal of dioxin and furanes in scrap-based steelmaking. The results of the improvements have shown that it is possible to reduce the dust emissions to less than 1 mg/m3 STP (the local limit is 5 mg.fm38TP) corresponding to app. 1g./t. produced steel. The dioxin emission in less than 1 g./year, corresponding to 1500 TCDD-eq ng/t. produced steel. It has been proved that the metallurgy-, energy-, and furnace off-gas conditions are of the greatest importance for the lowering of dust and dioxin emissions, as well as for the optimization of the energy consumption. Therefore, investigations of the energy conditions in the furnace are made, and the furnace has been rebuilt to ensure a sealed furnace. These improvements have reduced the quantity of gas to be filtered from the previous 90 .000 m38TP/h to 40.000m38TP/h from each furnace. It has also been shown that a continuous monitoring and control of the consumption with approximately 10%. Danish Steel Works Ltd. has led a project in an ECSC project which is going to find an economically and energy-wisw optimised way for further reduction of the dioxin emission. The results of the latest improvements are reported in this paper.