2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 3: Takano Intl. Symp. / Metals & Alloys Processing
| Editors: | Kongoli F, Noldin JH, Mourao MB, Tschiptschin AP, D'Abreu JC |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 550 pages |
| ISBN: | 978-1-987820-26-3 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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A New Design for the Iron Ore Sintering Process Based on Mathematical Modeling
Jose Adilson de Castro1; Marcos de Campos1; Elisa Pinto da Rocha2; Jorge Luiz Goncalves Pereira1;1UFF - FEDERAL FLUMINENSE UNIVERSITY, Volta Redonda, Brazil; 2, Volta Redonda, Brazil;
Type of Paper: Regular
Id Paper: 116
Topic: 3
Abstract:
The steel industry is recognized as an intensive energy consumption due to the units operation being carried out at high temperatures. The common energy sources usually come from fossil fuels such as coal, natural gas and oil. Thus, the environmental impact of the steel industry is recognized as one of the most important challenges to reduce the emissions that have been continuously imposed. In the integrated steel industry, the sinter plant is the responsible one to furnish high quality of raw materials for the blast furnace which produce pig iron for the subsequent processes of refining and steels elaboration. The sintering process is an intensive user of coal (approx 45 kg of coal per ton of sinter) and steelmaking by products. Several attempts have been made in order to substitute the coal by alternative energy sources, however further research and developments are demanded to attain the sinter product quality. The difficulties associated with the production of high quality sinter product are mainly attributed to the strict control of combustion phenomena with thermal energy release within the narrow sintering front which plays crucial role on the phase formation and thus, determines the final metallurgical and mechanical properties of the sinter. The biomass and bio-gas (synthetic gas produced from biomasses) are energy resources with low environment impact, however, radical modifications are usually required to produce reasonable sinter with compatible mechanical strength suitable to be used in large blast furnaces. In this paper, a new concept of sintering process is proposed. The new technology concept consist of combining the use of high reactivity of granular biomass produced from elephant grass and the modification of the sinter strand to adapt recirculation of the gas to increase the efficiency of drying and calcination zones. The research is carried out by using a comprehensive mathematical model based on transport equations of momentum, energy and chemical species for a multiphase system. The model is closed with additional equations for the rate of chemical reactions, phase interactions and heat exchange. The model is used to simulate the proposal of new sintering process concepts to determine new feasible technological industrial conditions. Based on the results obtained in this study, a reduction of 30 kg per ton of sinter product of fossil fuel is expected with reduction of 50% of the returned.
Keywords:
Charcoal; Fluids; Iron; Modeling; Process;References:
[1] Guilherme,V.S. and Castro, J.A.. Use of coke oven gas in iron ore sintering, REM-Revista da Escola de Minas, 65(2012), p.357-362.[2] Oyama, N. Iwami, Y., Yamamoto, T., Machida, S., Yguchi, T., Sato, H. Takeda, K., Watanabe, Y. and Shimizu, M. Development of secondary-fuel injection technology for energy reduction in the iron ore sintering process, ISIJ International, 51(2011) 913-921
[3] Kasai, E, Komarov, S., Nushiro, K. and M. Nakano. Design of Bed Structure Aiming the Control of Void Structure Formed in the Sinter Cake. ISIJ International, 45(2005) 538-543
[4] Cumming, M.J. and Thurlby, J. A., Developments in modeling and simulation of iron ore sintering. Ironmaking and Steelmaking. 17(1990) 245-254
[5] Castro, J.A., Sasaki, Y. and Yagi, J., Three dimensional mathematical model of the iron ore sintering process based on multiphase theory, Materials Research, 15(2012) 848-858.
[6] Castro, J.A., Pereira, J.L., Guilherme, V.S., Rocha, E.P. and França, A.B.. Model predictions of PCDD and PCDF emissions on the iron ore sintering process based on alternative gaseous fuels, Journal of Materials Research and Technology, 2(2013) 323-331.
[7] Castro, J.A. Guilherme, V.S. França, A.B. and Sasaki, Y. Iron ore sintering process based on alternative gaseous fuels from steelworks. Advanced Materials Research, 535(2012) 554-560.
[8] Melaen, M.C. Calculation of fluid flows with staggered and nonstaggered curvilinear nonorthogonal grids-the theory, Numerical Heat Transfer B, 21(1992) 1-19.
[9] Karki, K. C. and Patankar, S. V. Calculation procedure for viscous incompressible flows in complex geometries, Numerical Heat Transfer B, 14 (1988), p.295-307
[10] Nogueira, P. F.; Fruehan, R. J. 2006. Blast furnace burden softening and melting phenomena. Part III: melt onset and initial microstructural transformations in pellets. Metallurgical and Materials Transactions B, 37(2006) 551-558