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

Abstract

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.

Experimental study and modeling of biomass char gasification kinetics in a novel thermogravimetric flow reactor

“…Char gasification kinetics has been extensively studied by TGA (thermogravimetric analysis), as it allows easily obtaining reliable kinetic results under different operating conditions (pressure, particle size, heating rate, reactive gas concentration, temperature) [30][31][32][33][34][35]. TGA measurements are usually conducted using small and fine particle char samples, and consequently heat transfer and internal mass transfer resistances are negligible.…”