Abstract
The aim of this study is to investigate the kinetic compensation effect during the non-isothermal gasification of coffee char and lignite char in a CO2 environment. The non-isothermal gasification experiments were carried out using a thermogravimetric analyzer in the temperature range of 321 K–1273 K. The activation energies (E) and pre-exponential factors (A0) of different diffusion control zones were determined, and the relationship between kinetic compensation effects and diffusion was investigated. This study shows that different kinetic parameter calculation methods have no influence on the kinetic compensation effect; intrinsic reaction or external diffusion has a very weak kinetic compensation effect, and only bed diffusion has a more obvious kinetic compensation effect. The kinetic compensation effect shows a dependence on bed diffusion.
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