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High moisture content greatly restricts the large-scale utilization of low-rank coals (LRCs). Hydrothermal dewatering (HTD) is a promising technique for dewatering and upgrading LRCs. Chinese lignite from XiMeng Mine in Inner Mongolia was upgraded by HTD. The effects of pore structure and oxygen functional group content on moisture distribution were investigated. Thermogravimetric analysis, mercury...
Hydrothermal dewatering (HTD) is a promising method for in-depth upgrading of lignite because of its comprehensive modifications, including dehydration, deoxygenation, carbonization, and surface modification. The oxygen functional groups in XiMeng lignite before and after HTD was quantitatively determined using the 13C direct polarization/magic angle spinning technique. After HTD, the amounts of carboxyl,...
Two brown coals from China were dewatered under hydrothermal dewatering (HTD) conditions at 250–320°C for 1h in a 2L autoclave. The hydrothermally dewatered products were used to prepare coal water slurry (CWS) with a lower viscosity than brown raw coal slurry. Moreover, the coal rank and heat value of the brown coal increased as the inherent moisture and oxygen content decreased during the HTD process...
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