Effect of injection of Shendong high-calcium bituminous coal on thermal state of blast furnace raceway
The thermal state of blast furnace tuyere and raceway has an important influence on the primary distribution of gas flow in the furnace,which further affects the economic and technical indexes of the blast furnace.In order to explore the influence of injection of Shendong high-calcium bituminous coal on the thermal state of blast furnace raceway,the blast furnace blast parameters and other operating parameters are collected during the test firing period of a steel enterprise,the Fluent simulation method is used to establish a three-dimensional combustion model of the tuyere raceway,and the variation law of temperature distribution,gas distribution and velocity distribution under different injection conditions is systematically analyzed,so as to determine the influence of injection of Shendong high-calcium bituminous coal on the thermal state of the blast furnace raceway under the complex conditions of the tuyere.The simulation results show that the amount of reducing gas produced by Shendong high-calcium bituminous coal and ES anthracite burning is the largest,which is conducive to the reduction of ore during production,and the burnout rates are 72.25％,70.11％,68.87％and 67.56％respectively when Shendong high-calcium bituminous coal,HX bituminous coal,WN bituminous coal,SG bituminous coal and ES anthracite mixed pulverized coal are injected into the blast furnace,the burnout rate of pulverized coal is the highest when Shendong high-calcium bituminous coal and ES anthracite are mixed and injected,which is due to the higher CaO mass fraction of Shendong high-calcium bituminous coal and ES anthracite,and the best combustion characteristics in the tuyere and raceway;when Shendong high-calcium bituminous coal and ES anthracite are mixed and injected,the gas composition and pulverized coal burnout rate in the tuyere,raceway are stronger than those in the other three situations,which is suitable for blast furnace injection.
万方数据
维普
