Steam–O2 Blown Circulating Fluidized-Bed (CFB) Biomass Gasification: Characterization of Different Residual Chars and Comparison of Their Gasification Behavior to Thermogravimetric (TG)-Derived Pyrolysis Chars

Studies of the pyrolysis of biomass fuels and their residual char gasification are important to optimize and model gasification processes. In this paper, the characterization of circulating fluidized-bed chars (CFB-chars) was primarily performed. They were sampled from Agrol, willow, and dried distiller’s grains with solubles (DDGS) gasification using an atmospheric pressure 100 kWth steam–O2 blown CFB gasifier. The physical and chemical properties of char samples were studied by powder X-ray diffraction (XRD), X-ray fluorescence (XRF), N2 adsorption/desorption at −196 °C, and scanning electron microscopy (SEM) coupled with energy-dispersive scattering (EDS). Sequentially, the pyrolysis behavior of the Agrol, willow, and DDGS chars was investigated using thermogravimetric analysis (TGA) coupled with a Fourier transform infrared (FTIR) spectrometer. Gasification reactivities of CFB-char and char obtained after pyrolysis (PYR-char) were further investigated. The influences of the pyrolysis temperature (750 ...

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