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.
Highlights
Pulverized coal injection in blast furnace is the effective way to reduce coke consumption and fuel ratio, while a certain extent, reduce the environmental pollution caused by coking
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
Hu’s study has shown that [12], the solution loss reaction of coke began to occur at 1073 K and carbon solution loss reaction was taken place in a certain temperature range
Summary
Pulverized coal injection in blast furnace is the effective way to reduce coke consumption and fuel ratio, while a certain extent, reduce the environmental pollution caused by coking. Coke in the blast furnace is act as a heat source, reducing agent, carburizing agent involved in physical and chemical reactions in furnace. It plays the role of the skeleton supporting the burden. The smelting process was strengthened by pulverized coal injection representatively, and the residence time of coke in blast furnace especially in deadman is prolonged. Under these conditions, coke experienced greater damaging effects, the coke layer became thinner, and "coke window" layer of cohesive zone which is maintained permeability became smaller. This article studied the reaction behavior of coexistence of unburned pulverized coal and coke with CO2 by thermal gravimetric analysis
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