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Study on economical pulverized coal injection in WISCO
Pages: 14-17
Year: Issue:  2
Journal: Research on Iron and Steel

Keyword:  blast furnaceeconomical pulverized coal injectioncoal ratiocoke ratio;
Abstract: In order to optimize pulverized coal injection for the blast furnaces in WISCO, suitable coal grades used for injection have been determined by a systematic survey on coal resources.By calculating theoretical flame temperature in front of tuyere under the condition of high PCI ratio,main factors that influence pulverized coal injection have been analyzed.By analyzing the residual carbon amount in blast furnace dust and finding out its source,a conclusion can be made that the proportion of unburnt pulverized coal in blast furnace dust was about 10 % under the present operation conditions.The results could be used for acquaintance with the utilization of unburnt pulverized coal in blast furnace and to evaluate the situation of pulverized coal utilization.By means of statistical analysis on blast furnace operation indexes,it was found that fuel rate was lower when coal ratio was 160~170 kg/t.The practical results showed that after using the economical pulverized coal injection technology,coke rate of No.5 BF of WISCO had been reduced by 9.7 kg/t while coal rate slightly increased by 0.8 kg/t.
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