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 |
| ISBN: | 978-1-987820-46-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
CD shopping page
A Research Experience on Science and Technology of Ironmaking
JUN-ICHIRO YAGI1; Tomohiro Akiyama2; Eiki Kasai3; Hiroshi Nogami1;1TOHOKU UNIVERSITY, Sendai, Japan; 2HOKKAIDO UNIVERSITY, Sapporo, Japan; 3GRADUATE SCHOOL OF ENVIRONMENTAL STUDIES, TOHOKU UNIVERSITY, Sendai, Japan;
Type of Paper: Invited
Id Paper: 22
Topic: 3
Abstract:
For future progress, this presentation looks back on the research conducted in my laboratory with co-workers at Tohoku University.
As the main research subject, a three-dimensional transient mathematical model of the blast furnace was established considering complex transport processes. The model was being developed from two viewpoints of mathematical description/numerical computation and elucidation of elemental phenomena. The model developed has been used to simulate in-furnace phenomena with operation results for improving practical operations and for developing new technology.
The blast furnace model has been modified to simulate several the other packed bed processes. The modified model has been used effectively during the development of each process.
Some simulation results are explained for a super high-efficiency operation of BF and also for the other moving bed processes. Studies on the elemental phenomena are explained by gas-solid heat transfer coefficient and wet area of the irrigated packed bed.
Precise energy evaluation has the possibility to improve energy efficiency in the packed bed processes. Some results of exergy analysis are explained, which is applied to conventional and developing ironmaking processes.
Relating to BF, we studied on a rotary cup atomizer with packed bed process to produce granular slag and to recover thermal energy from molten slag and on methanol synthesis from BF off gas. These results showed the possibility to improve thermal efficiency and mitigation of CO2 emission.
To summarize above-mentioned items, the mathematical model is a useful tool to improve process efficiency and to develop new technology. However, accurate description of elemental phenomena is prerequisite. From these researches improvement of waste energy recovery and hydrogen application are favorable strategies to decrease CO2 emission from ironmaking industry to protect earth environment from global warming.
Keywords: Blast Furnace, Mathematical Model, Exergy, CO2 Reduction
Keywords:
Blast; CO2; Furnace; Iron; Recovery; Recycling; Scrap; Slag;References:
[1] J. Yagi: My Research on Mathematical Modeling of Blast Furnace Process, Bulletin of IMRAM on the Advanced Materials Processing, Tohoku University, 61(2005), 1-10[2] J. Yagi: Analysis and Evaluation of Ironmaking Processes Based on Transport Phenomena Theory, Bulletin of ISIJ(Ferrum), 11(2006), 452-456
[3] P. R. Austin, H. Nogami and J. Yagi: A Mathematical Model for Blast Furnace Reaction Analysis Based on the Four Fluid Model, ISIJ International, 37 (1997), 748-755
[4] J. A. Castro, H. Nogami and J. Yagi: Transient Mathematical Model of Blast Furnace Based on Multi-fluid Concept, with Application to High PCI Operation, ISIJ International, 40 (2000), 637-646
[5] H. Nogami, M. Chu and J. Yagi: Multi-dimensional Transient Mathematical Simulator of Blast Furnace Process Based on Multi-fluid and Kinetic Theories, Computers and Chemical Engineering, 29 (2005), 2438-2448
[6] S. V Patankar: Numerical heat transfer and fluid flow, 1980, Mc Graw-Hill, New York
[7] J. Yagi: Innovative Operations of Blast Furnace with Super-high Production and Super-low Environmental Load, Current Advances in Materials and Processes, 18(2005), 46-49
[8] J. Yagi, R. Takahashi, T. Akiyama and X. Zhang: Numerical Analysis of a Moving Bed Reactor for Iron Scrap Melting, Proceedings of The Julian Szekely Memorial Symposium on Materials Processing, Boston, 1997. Ed. H. Y. Sohn, J. W. Evans and D. Apelian, The Minerals, Metals & Materials Society, 83-100
[9] X. Zhang, R. Takahashi, H. Nogami and J. Yagi: Numerical Simulation of the Moving Bed Furnace for Reduction and Melting of Oxidized Iron-scrap Briquette Containing Coke Breeze, Tetsu-to-Hagane, 87 (2001), 410-418
[10] T. Akiyama, R. Takahashi and J. Yagi: Measurement of Heat Transfer Rate between Particle and Fluid in Counter-current Moving Beds, Tetsu-to-Hagane, 76(1990), 848-855
[11] M. Niu, T. Akiyama, R. Takahashi and J. Yagi: Development of Measuring Method and a Fixed Quality for Wetted Area between Liquid and Particles in a Packed Bed for Ironmaking, Testu-to-Hagane, 82(1996), 647-652
[12] T. Akiyama and J. Yagi: Exergy Analysis of Conventional Ironmaking, Direct Reduction-Electric Furnace and Smelting Reduction Systems, Tetsu-to-Hagane, 74(1988), 2270-2277
[13] T. Akiyama and J. Yagi: An Analysis on Exergy Consumption and CO2 Discharge in Ironmaking Systems, Tetsu-to-Hagane, 77(1991), 1259-1266
[14] T. Mizuochi, T. Akiyama, T. Shimada, E. Kasai and J. Yagi: Feasibility of Rotary Cup Atomizer for Slag Granulation, ISIJ International, 41(2001), 423-1428
[15] S. Machida, T. Akiyama, A. Muramatsu and J. Yagi: Direct Conversion of Blast Furnace Gas to Dimethyl Ether over Cu-ZnO-Ga2O3/γ-Al2O3 Hybrid Catalyst: Optimum Mass Ratio of the Catalyst, ISIJ International, 37(1997), 531-535
[16] H. Isogai, T. Akiyama and J. Yagi: Combustion Synthesis of Mg2Ni and Mg2NiH4, Journal of Japan Institute of Metals and Materials, 60(1996), 338-344
[17] T. Akiyama, T. Negishi, K. Saito, L. Li, and J. Yagi: Operating Conditions for Hydriding Combustion Synthesis of Pure Mg2NiH4, Materials Transactions, 42(2001), 1748-1752