Effect of torrefaction temperature on Reverse Chemical Looping Pyrolysis Characteristics of Pine Wood Biomass

Abstract

Torrefaction treatments play a crucial role in upgrading the quality of pyrolysis bio-oils. In this study, the impact of torrefaction temperature (200, 230, 260, and 290°C) on the reverse chemical looping pyrolysis characteristics of pine wood biomass was investigated at 550°C. The findings revealed that torrefaction processes markedly decreased both water and oxygen levels in the biomass, ultimately improving the yield characteristics of the pyrolyzed materials. Specifically, when the torrefaction temperature reached 230°C, the phenol content in the pyrolysis liquid peaked at 73.4%, while the proportion of oxygen-containing compounds was minimized to 16.7%. With increasing torrefaction temperature, the content of hydroxyphenyl type (H) phenols increased, whereas the contents of guaiacyl type (G) and syringyl type (S) phenols gradually decreased.