2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 1: D'Abreu Intl. Symp. / Iron and Steel Making
| Editors: | Kongoli F, Noldin JH, Takano C, Lins F, Gomez Marroquin MC, Contrucci M |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 320 pages |
| ISBN: | 978-1-987820-37-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Mathematical Analysis on Charcoal Charging/Injection Operations of Ironmaking Blast Furnace
JUN-ICHIRO YAGI1; Jose Adilson de Castro2; Hiroshi Nogami1; Tomohiro Akiyama3; Eiki Kasai4;1TOHOKU UNIVERSITY, Sendai, Japan; 2UFF - FEDERAL FLUMINENSE UNIVERSITY, Volta Redonda, Brazil; 3HOKKAIDO UNIVERSITY, Sapporo, Japan; 4GRADUATE SCHOOL OF ENVIRONMENTAL STUDIES, TOHOKU UNIVERSITY, Sendai, Japan;
Type of Paper: Plenary
Id Paper: 68
Topic: 2
Abstract:
Charcoal is an attractive material in blast furnace operation due to its high possibility of CO2 emission mitigation.
This paper describes exergy analysis of practical operation data of ironmaking blast furnaces and dynamic simulation of the blast furnaces by using a multi-dimensional CFD model. Exergy analysis provides a comparison of energy consumption and CO2 emission between practical operations of the ironmaking blast furnaces with respective coal and charcoal charging. As a result, charcoal charging can decrease CO2 emission due to global carbon circulation with plantation of eucalyptus. But lump charcoal has not enough strength for the operation of large blast furnaces thus at present lump charcoal is charged only in small size blast furnaces.
Injection of pulverized charcoal through tuyeres is another promising technology which can be applied to large blast furnaces. Dynamic simulation has been conducted by using the CFD model of blast furnace process on the practical operations of a large blast furnace with a respective injection of pulverized coal and charcoal at the rate of 200kg/thm. Simulation results showed good agreement with practical operation data.
Afterwards, mixed injection of pulverized coal ad charcoal was simulated providing slightly higher productivity in the case of the injection rate of 100kg(PC)/thm+100kg(PCH)/thm than the case of 200kg(either PC or PCH)/thm. Higher combustion rate of the pulverized charcoal than the pulverized coal contributed this results. The dynamic simulation clarifies also the changes of in-furnace phenomena which is effective information for controlling the operation.
Keywords: Charcoal, Blast furnace, Exergy, Mathematical model,
Keywords:
Blast; Charcoal; Energy; Furnace; Modeling;References:
[1] 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[2] H. Nogami, J. Yagi and R. S. Sampaio: Exergy Analysis of Charcoal Charging Operation of Blast Furnace, ISIJ International, 44(2004),1646-1652
[3] J. A. Castro, H. Nogami, J. Yagi, C. Takano, M. B. Mourao and A. J. Silva: Investigation of the Simultaneous Injection of Charcoal and Coal into the Blast Furnace Raceway by The 3D Multiphase Model, Proceedings of 4th International Conference on Science and Technology of Ironmaking, Osaka, 2006, The Iron and Steel Institute of Japan, 165-168
[4] J. A. Castro, A. J. Silva, Y. Sasaki and J. Yagi: A Six-phases 3-D Model to Study Simultaneous Injection of High Rates of Pulverized Coal and Charcoal into the Blast Furnace with Oxygen Enrichment, ISIJ International, 51(2011),748-758
[5] J. Yagi, H. Sato and K. Yamada: Afforestation and Application of Charcoal to Ironmaking (in Japanese), Repression of Carbon Dioxide Emission and Future of Ironmaking Processes, Tokyo, 1993, Ed. H. Komiyama and Y. Ohno, The Iron and Steel Institute of Japan, 137-146