Hydrothermal treatment (HTT) for improving the fuel properties of biomass residues

Abstract Water leaching and hydrothermal carbonization are tools to upgrade biomass residues for combustion. reduces the ash content, which increases heating value, while (HTC) value content decreases organic fraction of fuel. The objective this study is investigate, whether low temperature treatment (HTT) can combine positive aspects both treatments avoid negative aspects: a decrease (leaching) instead an increase strong by deoxygenation reduction (leaching). Sawdust, conifer bark, black locust green cuttings, leaves were treated at 150 °C, 170 °C 185 in batch reactor. impact three on combustion properties, inorganic element reduction, compound formation liquid phase investigated. All residues, except sawdust showed increased values reduced contents. intensity increases, rates selected elements discussed, including comparison literature short review reaction processes pressure conditions.