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为了进一步研究焦炭在高炉内的劣化行为,探索更加适合高炉的的焦炭评价指标,利用武钢6号高炉中修挖炉缸的机会,从炉内自上而下分层取出焦炭试样,测定分析经高温反应后的焦炭试样的各项理化性能。采用开元5E-MAG6700全自动工分仪测定其水分、灰分和挥发分,采用科翔XQK-2000型显气孔率测定仪测定其显气孔率和灰分。研究结果表明,炉内残留焦炭相对于入炉焦灰分质量分数较高,固定碳质量分数下降明显,焦炭孔隙内滞留大量炉渣。高炉内初渣中SiO_2、Al_2O_3、CaO和MgO质量分数并不高,MnO和P_2O_5质量分数是终渣中几倍甚至10倍,有相当部分的造渣是在炉缸下部进行的。高炉内碱金属在炉腹下部至炉缸上部富集量最大,锌在炉缸上部富集量最大。通过对高炉中修残留焦炭的研究分析,对焦炭在高炉各部位的劣化行为规律认识更加深刻,并对高炉的特性把握更加准确,可用于指导高炉生产。
In order to further study the degradation behavior of coke in the blast furnace and explore the coke evaluation index which is more suitable for the blast furnace, taking advantage of the opportunity of reheating the hearth in WISCO No.6 blast furnace, The physical and chemical properties of coke samples after high temperature reaction. The moisture content, ash content and volatile matter content were measured by using Kaiyuan 5E-MAG6700 automatic analyzer. The apparent porosity and ash content were determined by using Kexiang XQK-2000 Porosity Detector. The results show that the mass fraction of residual coke in the furnace is higher than that in the coke ash, the fixed carbon mass fraction decreases obviously, and a large amount of slag remains in the coke pores. The initial slag in blast furnace SiO_2, Al_2O_3, CaO and MgO mass fraction is not high, MnO and P_2O_5 mass fraction is several times or even 10 times the final slag, a considerable part of the slagging is carried out in the lower part of the hearth. The amount of alkali metal in the blast furnace is the largest in the lower part of the bosh to the upper part of the hearth, and the maximum concentration of zinc in the hearth is the largest. By studying and analyzing the residual coke in the blast furnace, the understanding of the coke deterioration behavior in all parts of the blast furnace is more profound and the characteristics of the blast furnace can be grasped more accurately, which can be used to guide the blast furnace production.