Producing coal, preferably coal slurry from wet biomass, preferably sewage slurry by hydrothermal carbonization, comprises concentrating the biomass by dewatering, adjusting the pH of the biomass and drying the resulting product

摘要

Producing coal, preferably coal slurry from wet biomass, preferably sewage slurry by hydrothermal carbonization, comprises concentrating the biomass by dewatering to a value of above 10% dry substance portion, prior to the hydrothermal carbonization; adjusting the pH of the biomass to less than 4, prior to the hydrothermal carbonization; and subsequently drying the resulting product by process-waste heat originated from the hydrothermal carbonization, where the carbon structures of the biomass are broken preferably at 180-200[deg] C under airtight. An independent claim is included for an apparatus for carrying out the above method.