An investigation of the structure and gasification reactivity of char

作者:Wang Pei*; Zhu Wenjian; Bai Yonghui; Li Fan
来源:International Conference on Sustainable Energy and Environmental Engineering (ICSEEE 2012), 2012-12-29 To 2012-12-30.
DOI:10.4028/www.scientific.net/AMM.295-298.3110

摘要

The Yining char samples were prepared in following conditions that raw coal particle size was in range 5-6mm and pyrolysis final temperature was 900 degrees C, 1000 degrees C and 1100 degrees C, respectively, with a heating rate 20 degrees C/min under atmospheric pressure. The gasification reactivity of chars was performed by thermogravimetric analysis (TGA) at 900 degrees C in steam, CO2 and steam/CO2 mixture, respectively. The results show that the gasification reactivity of chars decreases with the increasing of pyrolysis final temperatures and there is synergistic effect between steam and CO2 during co-gasification that influences the char reactivity. The reason may be explained by char structure change, which FTIR showed that -CH3 and -O-CH3 decreased and even disappeared and XRD analysis suggested that the thickness of microcrystalline L-c, the values of microcrystalline diameter L-a and the aromatic of char f(a) became larger with increasing pyrolysis temperature.

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