Influence of H2 Content in Gas on Burden Reduction of Blast Furnace
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摘要: 研究不同H2含量煤气条件下高炉炉料的还原过程,观察矿石微观结构及元素成分,结果表明:相同温度下,随着氢气含量增加矿石中铁元素聚集明显增加;随着还原气中氢气含量增加,矿石失重率、还原率、金属化率均升高。由于氢气含量的提高,间接还原得到发展,可以有效降低直接还原度。但是氢气含量过高,则会发生非铁金属的还原,这可能导致能耗升高,煤气中的氢气含量应选择合适的值为15%左右。Abstract: The influence of different H2 content on reduction process of burden in blast furnace was investigated.The chemical compositions of the reduced burden were determined.The results show that the Fe aggregates obviously with the increasing of the H2 content in the reducing gas.The weight loss rate,the reduction rate and the metallization rate of the burden increase with the increasing of the H2 content.Because the H2 content was increased the indirect reduction was improved,so the degree of direct reduction was decreased effectively.Although the metallization rate also increases with the H2 content,much higher H2 content will cause the reduction of non-ferrous metal and thus higher energy consumption.So H2 content in the reducing gas should be controlled within a proper range of~15%.
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Key words:
- blast furnace /
- H2 content /
- the burden /
- the weightlessness rate /
- the reduction rate /
- the metallization rate
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