Abstract
This study aims to evaluate the effects of inorganic species (K) and torrefaction temperature on the physicochemical structure and reactivity of char from pyrolysis of torrefied rice husk in a laboratory-scale fluidized-bed apparatus. Washed rice husk (WRH) and washed rice husk with impregnating of potassium (0.1K-WRH) were torrefied at the different temperatures of 230–270 °C. The physicochemical structure of char samples were determined by elemental composition, pore structure (N2 adsorption-desorption) and carbon microstructure (Raman spectroscopy). Furthermore, the char reactivity in air was analyzed using thermogravimetric analyzer (TGA). The results indicated that the changes in elemental composition, pore structure and carbon microstructure of char samples caused by the combined effects of torrefaction process and the presence of K have the important role on the char reactivity. The dimensionless index (DI) accounted for the physicochemical structure was defined, which exhibited a strongly linear relationship between the oxidation activity index (S) of char samples. In general, both of the torrefaction temperature and the inorganic species (K) contained in rice husk samples have the important effects on the physicochemical structure and reactivity of char samples.
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