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) |
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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
Abstract:
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 1970fs, 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
Keywords:
Energy;References:
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