Abstract
The effects of supercritical carbon dioxide (SCCO2) extraction on coal composition, coal rank, pore structure and combustion reactivity of three typical Chinese low-rank coals (LRCs) were investigated in this study. The results show that SCCO2 extraction process has significantly reduced the moisture content and increased the fixed carbon content of LRCs. The oxygen/carbon atomic ratio of upgraded LRCs decreases, indicating that the coal rank of upgraded LRCs improves after SCCO2 extraction, which is consistent to the findings from Fourier transform infrared spectroscopy. The specific surface area (SSA) and total pore volume (TPV) of upgraded HLBE and ZT lignite increase significantly with extraction time and temperature. Thermo-gravimetric analysis shows that the combustion process of upgraded LRCs is moving toward high temperature region and its burnout temperature (Tb) increases. The average reactivity rate (kmean), maxium reactivity rate (kmax) and the comprehensive reactivity parameter S increase obv...
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