Accomplishment of Complex of Ablution of Blast Furnaces at Pc Injection and Usage of Charge Materials of Variable Quality

Abstract

Operation of blast furnaces (BF) at injection of pulverized coal (PC) and usage of charge materials of nonstable quality results in increasing of slag melt heterogeneity, disturbance of gas-dynamic and heat mode of melt, accompanied by increase of total and lower gas pressure drop along the BF height, nonuniformity of adjacent melt products tappings by mass, chemical composition and temperature, increased burning of air tuyeres. As experience shows, this results in a necessity to arrange special and complex ablutions of the BF hearth to remove coke destruction products and unburnt particles of PC. Property features of ablution materials and regulation of their application considered. Results of ablution of the hearth, coke packing and BF profile of the steel-works in Kamenskoye, Dnepropetrovsk region (now – PJSC DKKhZ MP, before August of 2021 – PJSC “Dnepr steel-works”) presented. Based on comparative analysis of the results of ablution with application of various materials including high-protoxidic sinter and iron-containing briquettes, it was established that mixture of sinter and pellets with iron-containing briquettes were most effective kinds of ablution compositions. A positive experience of manganese-containing materials in BF charge application on continuing basis was considered. The availability of a method of cold roll briquetting for ablution materials agglomeration was shown. The results presented testify to efficiency of the ablution materials application at BF under conditions of their operation with variable charge, fuel and technological parameters. Observation of regulation of ablution accomplishment enables to provide stable operation of BF and reaching required technical and economic indices