Effect of hydrothermal dewatering on the moisture content of brown coal

ABSTRACTBrown coal was dewatered under hydrothermal dewatering (HTD) conditions. The variation in moisture content and distribution of brown coal were studied. The results showed that equilibrium moisture content decreased from 28.2% to 9.6% after hydrothermally treated at 300 oC. Three types of moisture existed in brown coal and its HTD products according to the coal-water binding energy (Eb): Surface adsorption water (Eb 9000 kJ/kg). Drying rates of these types of moisture​ respectively followed logarithmic, linear, and indicial equations.