Abstract
In this paper, isothermal gasification experiments were performed on coal (lignite) or biomass (coffee grounds) in a thermogravimetric analyzer. Different crucibles were used to delineate different control zones. Two main features regarding the intrinsic reaction were deduced and derived. The experimental results for the intrinsic reaction verify the correctness of the features; the experimental results for external diffusion are similar to the features of the intrinsic reaction, but the activation energy is lower than that of the intrinsic reaction, requiring a combination of the two to be discriminated; the experimental results for bed diffusion show that it is extremely easy to determine the type of reaction, both in terms of features and activation energy. This study provides a simple method for judging and identifying intrinsic reactions, which is beneficial for the study of coal and biomass gasification kinetics.
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