Influence of unburned pulverized coal on gasification reaction of coke in blast furnace

Abstract

Abstract In order to explore the influence of unburned pulverized coal on gasification reaction of coke in blast furnace, kinetic rules of gasification reaction between CO2 and coke powder adding pulverized coals with different volatiles were studied by thermogravimetric analysis. The results showed that weight-loss ratio of samples reacted with CO2 increased after adding pulverized coal, and the weight-loss ratio rose with the increase of coal’s addition. When the content of pulverized coal was up to 50%, the weight-loss ratio of the sample which adding pulverized coal with high volatile was higher under the same temperature. The activation energy about C-CO2 gasification reaction of samples reduced observably after adding pulverized coal. The activation energy of samples had a largest decrease with 83.408 kJ mol−1 at the range of 1223 K~1373 K and it was 28.97 kJ mol−1 at the range of 1373 K~1523 K. The addition of pulverized coal with high volatile can reduce the reaction activation energy of samples more effectively. In the soft melting zone, the gasification reaction model of coke blocks attached the unburned pulverized coal was up to unreacted core model and porous volume-reacted model jointly.