Abstract
Agricultural residues can be an energy resource. However, alkali materials in their ashes are the causes of slagging and agglomeration problems. To reduce alkali materials, hydrothermal carbonization process was selected. Thai rice husk was used as sample to study. It was heated under different temperature ranged from 180°C to 250°C, as operated pressure ranges from 12 bar to 42 bar with holding time 1 hour. The results show that the percentage by mass of fixed carbon are increased, but volatile matter and ash content are decreased as temperature increases. Meanwhile, the X-Ray fluorescence (XRF) analysis results show the decreasing of alkali materials.
