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Power Engineering and Ecology
ArticleName Reducing greenhouse gas emissions with Energiron non-selective carbon-free emissions scheme
ArticleAuthor P. E. Duarte, J. Becerra.

P. E. Duarte, Business Director; J. Becerra, Vice-President of Engineering, HYL Technologies SA de CV (Tenova HYL), Monterrey, Mexico;


In integrated blast furnace (BF) based steel mills, there is always an excess of coke oven gases, converter gases and blast furnace top gases, which are normally used in power stations. An alternate approach is to use this available energy for the production of direct reduced iron, which can be fed as metallic charge to BF providing an increase in production of crude steel or alternatively, a significant reduction of fossil fuels specific consumption. The optimized utilization of primary fossil energy will have the effect of significantly reducing the specific CO2 emissions per ton of crude steel. The specific CO2 emissions via the conventional BF/BOF route is about 1.7 — 1.8 t of CO2/t crude steel, even on an optimized process route basis. Utilizing the DRI being produced with natural gas, coke oven gas and BF top gas as metallic charge to BF or in an electric arc furnace, allows significant reductions in absolute and specific CO2 emissions. The Energiron DR process intrinsically includes a CO2 absorption system for the selective elimination of CO2, leaving only 30 % of total carbon entering the process as non-selective emission through flue gases from the PG heater stack. CO2 stripping is achieved by using the top gas waste sensible heat, avoiding the need of additional energy requirements. With this proposed simple approach, a complete non-selective CO2-free emissions “green”DR plant is now available in the market. Its applicability and efficiency has to be evaluated according to the specific conditions at each single site.

keywords Greenhouse gas emissions, blast furnace practice, basic oxygen converters, carbon dioxide, direct reduced iron, DR plants, fossil fuel

1. Knop, K.; Duarte, P. Zendejas, E.; Gerike, U.: Technical, economic and ecological aspects for optimized use of fossil primary energies in integrated steel plants for crude steel production, METEC Conference, June 2003, Du..sseldorf, Germany.

2. Duarte, P.; Knop, K.; Zendejas, E.: Technical and economic aspects of production and use of DRI in integrated steel works, Millennium Steel (2004), p. 49/53.

3. Kercsmar, D. A.; Yamauchi, Y.; Dibert, W.; Klea ther, J.: Sustained production in excess of 9 t/day/100 ft3 WV at Middletown’s No. 3 blast furnace, ISS 53rd Ironmaking Conf., March 1994, Chicago, USA.

4. Duarte, P. E.; Tavano, A.; Zendejas, E.: Achieving carbon-free emissions via the Energiron DR process, AISTech 2010, May 2010, Pittsburgh, USA.

Language of full-text russian
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