Study on the effect of transition zone-condensation field for the evolution and selective condensation of biomass pyrolysis vapors

Abstract

The effect of regulating the transition zone temperature and the intensity of the condensation field on the characteristic parameters and important components of bio-oil was studied during the pyrolysis of cotton straw. A new approach was provided to improve the possibility for refined condensation of biomass pyrolysis vapors, increase the bio-oil yield and recovery of important components. The Logistic model effectively tracked the evolution of the characteristic components of the bio-oil and comprehensively demonstrated the selective condensation effect of the biomass pyrolysis vapors. It was found that higher transition zone temperatures improved pyrolysis vapors condensation. The temperature gradient affected the content of important components in bio-oil. Adjusting the transition zone temperature promoted the initial separation of unfavorable components such as water in the bio-oil, and the enrichment of critical organic components was achieved in combination with the condensation field. The high transition zone temperature and weak condensation field contributed to an increase in the recovery of total phenolic compounds from 0.69 wt% to 8.20 wt%.