2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 1. Afonso Intl. Symp. / Iron and Steel Making
| Editors: | F. Kongoli, M.-C. Gomez-Marroquin, M. Contrucci, N. Lacerda, F. V. Cancado, M. de Souza, R. Valladares |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 184 pages |
| ISBN: | 978-1-987820-82-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Importance of Coke Quality and Optimization for Higher Pulverized Coal Injection Rates in Blast Furnace
Hemant Upadhyay1; Deepesh Chandra1; Arvind Bhagat1;1JINDAL STEEL AND POWER LTD, Raigarh, India;
Type of Paper: Regular
Id Paper: 172
Topic: 2
Abstract:
Coke is a fuel with few impurities and high carbon content. It is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coal. Coke is the most important factor in blast furnace iron making, which provides heat, reactants, and mechanical support to burden, and accounts for more than 50% of hot metal production cost alone. In modern blast furnace operational practices significant efforts are made to decrease the costly coke consumption mainly by introducing cheaper coals in pulverized form through tuyeres. This alters the in-furnace aerodynamics, reduction conditions, burden distribution and demands on raw material, particularly coke, quality. Therefore coke quality such as its hot and cold strength, reactivity, composition, size fraction and granulometry etc. exerts great influence on the performance of blast furnaces. With increasing productivity & pulverized coal injection, the quality requirement becomes more and more stringent. This is due to the fact that ascending injection rates cause descend in coke unit per charge and the function of coke from being thermal, chemical and mechanical equally shifts to become predominantly mechanical. Hence, in order to maintain stable operation with higher rates of performance, it is important to have lowest possible degradation of coke during its travel from top to bottom of the furnace. This in turn demands proper understanding of the conditions coke has to face in the BF (i.e. effect of alkali, lime, other oxides, char/dust & reactions with surrounding gases) and mechanisms of fines generation & consumption in the blast furnace.
In this work, a study on the role of coke and its functions in traditional as well as modern high PCI furnace operations, has been made. The mechanisms inducing and affecting coke degradation have been investigated and correlated with the actual experience from one of the best blast furnaces operating in the world.