ISSN 2594-357X
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The technology of using high reactivity coke in the blast furnace ironmaking process is proved to promote iron ore reduction in lump zone by both theoretical analysis and experimental research. However, the absent of relative process calculation model makes it difficult to determine the coke saving potential quantitatively and supply substantial guidance for practical production. Based on ironmaking process theories, the effect of using high reactivity coke on RIST operation line is firstly analyzed. Taking the heat conservation zone and high temperature zone as investigation targets, a new process calculation model based on material and heat balance is established to study the influences of charging high reactivity coke on iron oxide reduction, shaft efficiency, fuel rate as well as coke saving potential. The results show that: The charging of high reactivity coke on the one hand encourages endothermic boudouard reaction, on the other hand promotes the exothermic indirect reduction. The total heat balance reduces the temperature of the heat conservation zone. Although there is partly direct reduction happened in the heat conservation zone, the increasing iron oxide reduction efficiency would greatly reduce direct reduction in the high temperature zone. The charging of high reactivity coke reduces not only direct reduction, but also heat consumption of high temperature zone by allocating the direct reduction region reasonably, which leads to lower fuel rate.
The technology of using high reactivity coke in the blast furnace ironmaking process is proved to promote iron ore reduction in lump zone by both theoretical analysis and experimental research. However, the absent of relative process calculation model makes it difficult to determine the coke saving potential quantitatively and supply substantial guidance for practical production. Based on ironmaking process theories, the effect of using high reactivity coke on RIST operation line is firstly analyzed. Taking the heat conservation zone and high temperature zone as investigation targets, a new process calculation model based on material and heat balance is established to study the influences of charging high reactivity coke on iron oxide reduction, shaft efficiency, fuel rate as well as coke saving potential. The results show that: The charging of high reactivity coke on the one hand encourages endothermic boudouard reaction, on the other hand promotes the exothermic indirect reduction. The total heat balance reduces the temperature of the heat conservation zone. Although there is partly direct reduction happened in the heat conservation zone, the increasing iron oxide reduction efficiency would greatly reduce direct reduction in the high temperature zone. The charging of high reactivity coke reduces not only direct reduction, but also heat consumption of high temperature zone by allocating the direct reduction region reasonably, which leads to lower fuel rate.
Palavras-chave
Blast furnace; High reactivity coke; Heat conservation zone; Process calculation model.
Blast furnace; High reactivity coke; Heat conservation zone; Process calculation model.
Como citar
Sun, Ying;
Wu, Sheng-li;
Zhang, Li-hua;
Zhou, Yu;
Shen, Wei;
Tuo., Bi-yang.
CALCULATION MODEL OF NEW BLAST FURNACE
IRONMAKING PROCESS BY USING HIGH REACTIVITY
COKE
,
p. 373-381.
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-22103
