ISSN 2594-357X
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Adding nut coke or high reactivity coke (HRC) can promote ore/coke coupling reaction in the lumpy zone of blast furnace (BF), thus improving iron ore reduction degree (RD) efficiency. Although lots of works aiming to increase coke strength after reaction (CSR) of HRC are studied, few of them take the reasonable coke proportioning for BF into consideration. Present work firstly compares the RD of iron ore as well as CSR when HRC is mixed in sinter, pellet and lump ore column respectively. Then, the above behaviors are further investigated under different proportions of HRC in sinter column. Finally, two methods, named ‘More HRC of Lower Reactivity’ and ‘Less HRC of Higher Reactivity’, are proposed and the relative results are compared to discuss the reasonable coke proportioning for BF. The results show that sinter performs better considering both CSR and ore/coke coupling reaction when mixed with HRC. The increasing proportion of HRC reduces CSR, but the increase in RD by such drop in unit CSR of coke almost keeps constant. The gasification degree of coke in ‘Less HRC of Higher Reactivity’ method is less to obtain high CSR while the RD of iron ore is almost the same in comparison with ‘More HRC of Lower Reactivity’, so the increase in RD by the drop in unit CSR of coke doubles correspondingly. Therefore, the ‘Less HRC of Higher Reactivity method’ is preferred reasonable coke proportioning in BF.
Adding nut coke or high reactivity coke (HRC) can promote ore/coke coupling reaction in the lumpy zone of blast furnace (BF), thus improving iron ore reduction degree (RD) efficiency. Although lots of works aiming to increase coke strength after reaction (CSR) of HRC are studied, few of them take the reasonable coke proportioning for BF into consideration. Present work firstly compares the RD of iron ore as well as CSR when HRC is mixed in sinter, pellet and lump ore column respectively. Then, the above behaviors are further investigated under different proportions of HRC in sinter column. Finally, two methods, named ‘More HRC of Lower Reactivity’ and ‘Less HRC of Higher Reactivity’, are proposed and the relative results are compared to discuss the reasonable coke proportioning for BF. The results show that sinter performs better considering both CSR and ore/coke coupling reaction when mixed with HRC. The increasing proportion of HRC reduces CSR, but the increase in RD by such drop in unit CSR of coke almost keeps constant. The gasification degree of coke in ‘Less HRC of Higher Reactivity’ method is less to obtain high CSR while the RD of iron ore is almost the same in comparison with ‘More HRC of Lower Reactivity’, so the increase in RD by the drop in unit CSR of coke doubles correspondingly. Therefore, the ‘Less HRC of Higher Reactivity method’ is preferred reasonable coke proportioning in BF.
Palavras-chave
Blast furnace; Ore/coke coupling reaction; CSR; Coke proportioning.
Blast furnace; Ore/coke coupling reaction; CSR; Coke proportioning.
Como citar
Wu, Jian-long;
Wu, Sheng-li;
Zhang, Li-hua;
Tuo, Bi-yang;
Xu, Jian;
Kou, Ming-yin;
Zhou., Yu.
DISCUSSION ON COKE PROPORTIONING IN BLAST
FURNACE LUMPY ZONE CONSIDERING BOTH CSR AND
ORE/COKE COUPLING REACTION
,
p. 450-459.
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-22116
