Comparison of HTSM and TGA Experiments of Gasification Characteristics of Different Coal Chars and Petcoke

The thermogravimetric analyzer (TGA) is an ideal experimental method to estimate the gasification kinetics. However, the diffusion resistance was significant in high-temperature gasification process. In this study, comparison of different coal chars and petcoke gasification characteristics between high-temperature stage microscope (HTSM) and TGA experiments at high temperature were carried out. The gasification reactivity of different coal chars and petcoke in HTSM was higher than that in TGA experiments. The gasification reactivity of lignite and bituminous char in HTSM was much higher than that in TGA experiments. Meanwhile, the reactivity index of anthracite and petcoke in HTSM was merely double of that in TGA experiments. Interparticle diffusion process limited the gasification reactivity of different coal chars and petcoke in TGA experiments. The diffusion resistance of lignite and bituminous char was severe in TGA experiments. Moreover, the complete reaction time of bituminous coal char in HTSM experiments at high reaction temperature showed an agreement with industrial operating data.