不同液化条件下生物质残渣的燃烧特性研究

Experiments to examine the combustion characteristics of residues from sawdust liquefaction under different operation conditions (solvent, atmosphere, temperature and catalyst) were performed in a thermogravimetric analyzer (TGA92). The effect of liquefaction conditions on the combustion property of the residues was examined through comparing their characteristic parameters such as ignition temperature (ti), peak temperature of maximum weight loss rate (tp) and burnout temperature (tb). Based on the TG/DTG profiles, a residue combustion kinetics model was proposed and the kinetics parameters such as activation energy (E) and frequency factor (A) were obtained by Coats-Redfern method. The results show that liquefaction solvent could affect the combustion characteristics of residue obviously. The residue from biomass liquefaction with tetralin as solvent has the best combustion reactivity than both with toluene as solvent and without solvent, while the higher heating value of residue has the opposite trend. The residues from different liquefaction atmospheres almost have the same combustion characteristics. Other liquefaction conditions such as temperature and catalyst also could affect the combustion characteristics of residues. The kinetics of residue combustion could be described by a two-stage first order kinetic model.