Evaluation of Effect of Predrying on the Porous Structure of Water-Swollen Coal Based on the Freezing Property of Pore Condensed Water

摘要

The effect of the extent of predrying on the porous structure of water-swollen coal was examined. As-received Yallourn (YL), Beulah Zap (BZ), and Ilinois #6 (IL) coals were used as the samples. They were predried at 303 K to different extents. Upon predrying, the coal samples released waterin the fiollowitng order: free water identical to bulk water, bound water that froze at around 226 K, and finally, nonfreezable water that never froze even at 123 K. Predried samples were swollen inwater at 303 K and subjected to ~1H NMR measurements to characterize the freezing property of water retained in proes at a temeprature rante from 170 to 294 K.