ISSN 2594-357X
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Abstract
Blast furnace (BF) ironmaking is the most mature and efficient process at present. With the shortage of resource and industrial pollution increasing, how to furtherly decrease the fuel ratio becomes one of the important factors which restrict BF development. This paper analyzed the methods to decrease the fuel ratio from the viewpoint of increasing indirection reduction (IR) and decreasing heat consumption. Then, the methods to enlarge coke-saving potential by using metalized burden and high-reactivity coke were investigated. The results show that under the background of highly raw material quantity and operation level, comparing large BF with the small one, IR degree of large BF is relatively low, and the heat consumption (per ton of hot metal) is also different because of the difference in heat load and heat radiation. Increasing the coupling effect of reduction and gasification in thermal reserve zone, reduction efficiency increased in shaft, and the direction reduction degree in the lower part decreased, which shows the importance of rational allocation of direction reduction in BF. Using metalized burdens decreases the fuel consumption, as well as improves the permeability, while the problem of high melting temperature should be noted, to resolve which, metalized burdens should have high carbon content. Using high reactivity coke in BF could increase the reduction efficiency, as well as improve the permeability of cohesive dropping zone significantly.
Blast furnace (BF) ironmaking is the most mature and efficient process at present. With the shortage of resource and industrial pollution increasing, how to furtherly decrease the fuel ratio becomes one of the important factors which restrict BF development. This paper analyzed the methods to decrease the fuel ratio from the viewpoint of increasing indirection reduction (IR) and decreasing heat consumption. Then, the methods to enlarge coke-saving potential by using metalized burden and high-reactivity coke were investigated. The results show that under the background of highly raw material quantity and operation level, comparing large BF with the small one, IR degree of large BF is relatively low, and the heat consumption (per ton of hot metal) is also different because of the difference in heat load and heat radiation. Increasing the coupling effect of reduction and gasification in thermal reserve zone, reduction efficiency increased in shaft, and the direction reduction degree in the lower part decreased, which shows the importance of rational allocation of direction reduction in BF. Using metalized burdens decreases the fuel consumption, as well as improves the permeability, while the problem of high melting temperature should be noted, to resolve which, metalized burdens should have high carbon content. Using high reactivity coke in BF could increase the reduction efficiency, as well as improve the permeability of cohesive dropping zone significantly.
Keywords
Blast furnace; Fuel ratio; Metalized burden; High-reactivity coke.
Blast furnace; Fuel ratio; Metalized burden; High-reactivity coke.
How to refer
Wu, Shengli;
Zhang, Lihua;
Tuo, Biyang;
Sun, Ying;
Zhou, Yu;
Wu, Jianlong;
Liu., Xinliang.
INVESTIGATION OF TECHNOLOGY TRENDS IN
DECREASING BLAST FURNACE FUEL RATIO
,
p. 491-501.
In: 42º Seminário de Redução de Minério de Ferro e Matérias-primas / 13º Seminário Brasileiro de Minério de Ferro / 6th International Congress on the Science and Technology of Ironmaking,
Rio de Jabeiro,
2012.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-22121
