The Rate of Cokes Gasification by Gas Consisting of CO₂, H₂O, CO, H₂and N₂

Abstract

The gasification of coke by carbon dioxide or steam is one of the important reactions which take place in the blast furnace. But the rate equation, which may be applied to such an atmosphere of CO₂-H₂O-O-H₂-N₂-mixture as in the blast furnace, has not been reported yet. In order to determine the rate equation applicable to such gas mixtures, the gasification rates of pulverized metallurgical coke (24-35 mesh) by CO₂-N₂, CO₂-CO, H₂O-N₂and H₂O-H₂systems were measured between 1000 and 1100°C. The experimental results led to the following expression,
(Rate of gasification)=k₁p_CO2+k₄p_H2O/l+k₂p_CO2+k₃p_CO+k₅p_H2O
where P_CO2, P_H2O and Pco were the partial pressures of CO₂, H₂O and CO respectively, and the constants were functions of temperature.
Some workers have reported the retardation of gasification reaction by CO and H₂, but hydrogen did not retard the reaction under our experimental conditions. The above equation may be available for the mathematical simulation of the blast furnace.