Feasibility analysis on adding bag dust of material feeding system to coal injected into blast furnace
WANG Gang1, XU Kun2, WANG Guang-wei2, WU Yao-chun1
1. Feeding Operation Department, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063210, Hebei, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：The rational use of bag dust has always been one of the problems faced by iron and steel plants. Metallurgical companies in China mix coke dry quenching(CDQ) dust into injection coal for blast furnace in recent years, realizing the resourceful use of bag dust. In order to clarify the difference of technological performance for different bag dust in blast furnace injection and improve the absorbing ability of bag dust in blast furnace, the feasibility for blast furnace injection of CDQ dust CC9 and bag dust of material feeding system C8 and CCJ1, which were produced by Shougang Jingtang Company, and their mixed samples with blast furnace pulverized coal were analyzed, and industrial tests in Shougang Jingtang No.3 blast furnace were carried out according to the research results. The results show that the three kinds of bag dust all have high fixed carbon content and low volatile matter, and the combustion performance is worse than that of blast furnace pulverized coal injection. When the mixing ratio does not exceed 5%, the combustion curves of CC9, C8 and CCJ1 bag dust are approaching, the bag dust of material feeding system can be added to the pulverized coal for blast furnace injection production. From the results of industrial tests, the addition of 5% material feeding system bag dust will not have great impact on the blast furnace injection coal particle size, bag dust composition, blast furnace conditions and fuel consumption. It can replace the CDQ dust and make up the blast furnace blown resource gap of bag dust.
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