分段尝试法研究半焦/CO 2 气化反应过程动力学

Abstract

Non-isothermal experiments were carried out at different heating rates to further study the gasification reaction kinetics of semieoke with CO2, and the gasification mechanisms of Fuding semicoke with CO2 were confirmed in different stages. Then, it is reasonable to adopt a attempting method of subsection to study the gasification reaction kinetics and confirm the mechanism functions of the earlier and later periods in the reaction process, which are f(α)=(1-α)[1-φ1n(1-α)]1/2 and f(α)=(3/2)[(1-α)-1/3-1]-1, so the related kinetic parameters and corresponding dynamic models in different stages of the process are established. After data-fitting of the kinetic models in different stages, experimental data fit well with these models and the correlation coefficients are above 0.98. At last, according to the calculated kinetic parameters, it is clearly realized that there is compensatory effect for the activation energy at different heating rates, which is a relational expression between the activation energy and the pre-exponential factor.