Experimental Study on Reasonable Gas Velocity of Dense Phase Coal Injection in Blast Furnace
This paper conducts relevant research on the coal injection process in blast furnace through numerical simulation and pilot experiments,including the study of the relationship between airflow velocity and coal flow pattern,pipeline resistance in different pipe diameters,and the influence of pipeline length on this relationship.The research results show that as the airflow velocity decreases from about 10 m/s,the coal flow pattern will gradually develop from uniform flow to pulse flow,partial flow,and eventually blockage.For a pipe diameter of DN=65 mm,coal begins to settle down when the airflow velocity is less than 4m/s;for a pipe diameter of DN=100 mm,coal begins to settle down when the airflow velocity is less than 5 m/s,at which time the unit length pipeline resistance is 0.6～1.1 kPa/m.When the pipeline length increases from 100 m to 1 400 m,the critical airflow velocity for coal settling remains above 5 m/s,indicating that the pipeline length has a relatively small impact on the airflow velocity selection in the coal injection system.The research results of this paper can provide reference for the selection of airflow parameters in the coal transport and injection process in blast furnace.
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