The high volatile,flammable and explosive characteristics of bituminous coal limit its appli-cation in blast furnace injection.In the paper,four kinds of bituminous coal injected into jianlong blast furnace in Shanxi province are selected,and the combustion characteristic parameters,explosiveness and grindability index of the four kinds of bituminous coal are analyzed,and the influence of bitumi-nous coal particle size and proportion on injection safety is studied.The results show that the propor-tion of bituminous coal in blended coal gradually increases,the ignition point of blended coal gradually decreases and the explosiveness gradually increases.Increasing the particle size of bituminous coal powder can effectively reduce the explosiveness of bituminous coal,which is an effective method to en-sure the safety of bituminous coal injection.When the ratio of guohua energy bituminous coal to inner mongolia jianghua bituminous coal is higher than 80%,the temperature and oxygen content of pulver-ized coal pulverizing,storage,transportation and injection system should be reasonably controlled to ensure production safety.
blast furnace coal injectionhigh volatile bituminous coalparticle sizesafety control parameters
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