Pyrolysis behavior and economics analysis of the biomass pyrolytic polygeneration of forest farming waste

摘要

The pyrolysis behavior of Chinese chestnut and Jatropha curcas shells (CNS and JCS, respectively) were investigated to determine the optimum operating temperature for biomass pyrolytic polygeneration systems. At low temperatures (250-450 degrees C), CO2 was the main component of the pyrolytic gas, and high acidity oil was obtained. When the temperature increased to 550-650 degrees C, phenol-enriched oil and high LHV biochar (similar to 26 MJ/kg) were obtained; H-2 and CO yields increased. At high temperatures (750-950 degrees C), heavy-oil and high LHV pyrolytic gas (similar to 15 MJ/m(3)) were obtained. Meanwhile, the biochar showed a highly condensed aromatic ring system and low H/C (similar to 0.1) and O/C (similar to 0.05) ratios. CNS and JCS biochars showed different tendencies with regard to their structure evolution. An economic analysis was performed, which suggested that the optimum operating temperatures were 450 degrees C for CNS and 350 degrees C for JCS.