Abstract：A mathematical model of the gas-solid flow，heat exchange and pulverized coal combustion in blowpipe was developed．Based on the technological parameters of practical blast furnace，by the way of numerical simulation，influences on the burnout of pulverized coal caused by the change of operating parameters such as particle diameter，oxygen enrichment and blast temperature were investigated with the help of business software．The variations of gas composition and temperature in blowpipe were also studied．The results indicate that the decreasing of particle diameter，the increasing of oxygen enrichment and blast temperature all can raise coal burnout．The main transformation of pulverized coal in blowpipe is devolatilization，which is sensitive to temperature，while insensitive to oxygen concentration．This conclusion is contrary to the simulation results of predecessors got in raceway．During the study of the influence of variables on pulverized coal burnout，the simulation region should contain both of blowpipe and raceway.
2014, Vol. 49 
