2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 6: Yagi Intl. Symp. / Metals & Alloys Processing

Editors:Kongoli F, Akiyama T, Nogami H, Saito K, Fujibayashi A
Publisher:Flogen Star OUTREACH
Publication Year:2016
Pages:480 pages
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Exergy Efficiency of Steelworks

    Tomohiro Akiyama1; JUN-ICHIRO YAGI2; Hiroshi Nogami2;
    1HOKKAIDO UNIVERSITY, Sapporo, Japan; 2TOHOKU UNIVERSITY, Sendai, Japan;
    Type of Paper: Regular
    Id Paper: 69
    Topic: 3


    This paper describes exergy efficiency of steelworks, in which history of exergy efficiency was mainly examined together with validation of constructal law1). Since energy is conserved, true energy evaluation of steelworks should be done by exergy based on the second law of thermodynamics. Until now, several papers published on different steelmaking processes for comparative analysis. The constructal law was proposed in 1996 by Adrian Bejan as a theory of the generation of design in nature, in which evolution is generally explained by the improvement of exergy efficiency. However, no paper has never been published on exergy efficiency of steelworks, in spite of its scientific and engineering attractiveness. Therefore, the purpose of this paper was to study exergy efficiency of steelworks of various ages and to validate the constructal law. First, operating data of typical integrated steelworks was collected or reasonably simulated3). The steelworks with the annual production of 6 million ton was consisted of ten processes; coke oven, sintering machine, blast furnace, LD converter, continuous casting, hot rolling, plate milling, cold rolling, annealing line, continuous galvanizing line (CGL). Next, mass and heat balances for each process were carefully confirmed, and finally, simplified exergy flow diagram was illustrated. In the exergy flow, as time passed, the ratio of waste heat decreased and the ratio of power generation increased. The results were that exergy efficiency were 34.2% in 1970fs, 41.1% in 1997 and 50.1% in 2030, showing evolution degree of steelworks in Japan. It also appealed a possibility that this methodology can apply to other chemical or metallurgical systems. <br />Keywords: Exergy, Steelworks, mass balance, heat balance




    [1] J. E. Ahern: Exergy method of energy systems analysis, 1980, John Wiley and Sons, New York.
    [2] T. J. Kotas: The Exergy Method of Thermal Plant Analysis, 1985, Butterworths, London.
    [3] J. Szargut, D. R. Morris, F. R. Steward: Exergy analysis of thermal, chemical, and metallurgical processes, 1987, Hemisphere Publishing, New York.
    [4] T. Akiyama and J. Yagi: Methodology to Evaluate Reduction Limit of Carbon Dioxide Emission and Minimum Exergy Consumption for Ironmaking, ISIJ International, 38/8(1998), 896-903. 5S. Tonomura: Outline of Course 50, Energy Procedia, 37(2013), 7160–7167
    [5] T. Akiyama, R. Takahashi and J. Yagi: Exergy Evaluation on the Pellets Production and Direct Reduction Processes for the Fired and Nonfired Pellets, ISIJ International, 29(1989), 447-454. 7T. Akiyama, H. Sato, A. Muramatsu, J. Yagi: Feasibility Study on Blast Furnace Ironmaking System Integrated with Methanol Synthesis for Reduction of Carbon Dioxide Emission and Effective Use of Exergy, ISIJ International, 33(1993), 1136-1143.
    [6] T. Hiraki, T. Akiyama: Exergetic life cycle assessment of new waste aluminium treatment system with co-production of pressurized hydrogen and aluminium hydroxide, Int. J. Hydrogen Energy, 34(2009), 153–161.
    [7] Y. Shudo, T. Ohkubo, Y. Hideshima, T. Akiyama: Exergy analysis of the demonstration plant for co-production of hydrogen and benzene from biogas, Int. J. Hydrogen Energy, 34(2009), 4500– 4508.
    [8] T. Akiyama, J. Yagi: Exergy Analysis of Conventional Ironmaking, Direct Reducing Electric Furnace and Smelting Reduction Systems, Tetsu-to-Hagane (J. Iron Steel Inst. Jpn.), 74(1988), 2270-2277.
    [9] N. Maruoka, T. Mizuochi, H. Purwanto, T. Akiyama: Feasibility study for recovering waste heat in the steelmaking industry using a chemical recuperator, ISIJ international, 44(2004), 257-262. 12T. Nomura, N. Okinaka, T. Akiyama: Technology of Latent Heat Storage for High Temperature Application: A Review, ISIJ International, 50 (2010), 1229-1239.
    [10] J. Yagi, T. Akiyama: Storage of thermal energy for effective use of waste heat from industries, J. Mat. Proc. Tech., 48(1995) 793–804.
    [11] A. Kaizawa, H. Kamano, A. Kawai, T. Jozuka, T. Senda, N. Maruoka, N. Okinaka, T. Akiyama: Technical Feasibility Study of Waste Heat Transportation System Using Phase Change Material from Industry to City, ISIJ International, 48 (2008), 540-548.
    [12] T. Nomura, N. Okinaka, T. Akiyama: Waste heat transportation system, using phase change material (PCM) from steelworks to chemical plant, Resources, Conservation and Recycling, 54(2010), 1000–1006.
    [13] H. Purwanto, T. Akiyama: Hydrogen production from biogas using hot slag, Int. J. Hydrogen Energy, 31(2006), 491–495.
    [14] L. Zhang, T. Akiyama: How to recuperate industrial waste heat beyond time and space, Int.J. Exergy, 6(2009), 214–227.
    [15] T. Hiraki, S. Yamauchi, M. Iida, H. Uesugi, and T. Akiyama: Process for Recycling Waste Aluminum with Generation of High-Pressure Hydrogen, Environ. Sci. Technol., 41(2007), 4454–4457.
    [16] I. Saita, T. Akiyama: Exergy Analysis of Hydriding Combustion Synthesis, J. Chem. Eng. Jap., 39 (2006) 525-530
    [17] R.B. Cahyono, N. Yasuda, T. Nomura, and T. Akiyama: Utilization of low grade iron ore (FeOOH) and biomass through integrated pyrolysis-tar decomposition (CVI process) in ironmaking industry: Exergy analysis and its application, ISIJ International 55, No. 2 (2015), 428-435.
    [18] A. Bejan and J. P. Zane: Design in nature, doubleday (2012) ISBN978-0-385-53461-1.

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    Akiyama T, YAGI J, Nogami H. Exergy Efficiency of Steelworks. In: Kongoli F, Akiyama T, Nogami H, Saito K, Fujibayashi A, editors. Sustainable Industrial Processing Summit SIPS 2016 Volume 6: Yagi Intl. Symp. / Metals & Alloys Processing. Volume 6. Montreal(Canada): FLOGEN Star Outreach. 2016. p. 61-68.