Comparative advantages analysis of oxidative torrefaction for solid biofuel production and property upgrading

This study performs the comparative advantage analysis of oxidative torrefaction of corn stalks to investigate the advantages of oxidative torrefaction for biochar fuel property upgrading. The obtained results indicate that oxidative torrefaction is more efficient in realizing mass loss and energy density improvement, as well as elemental carbon accumulation and surface functional groups removal, and thus leads to a better fuel property. The maximum values of relative mass loss, higher heating value, enhancement factor, and energy yield are 3.00, 1.10, 1.03, and 0.87, respectively. The relative elemental carbon, hydrogen, and oxygen content ranges are 1.30-3.10, 1.50-3.30, and 2.00-6.80, respectively. In addition, an excellent linear distribution is obtained between the comprehensive pyrolysis index and torrefaction severity index, with elemental carbon and oxygen component variation stemming from pyrolysis performance correlating to the elemental component and valance.

Automated summary

This study conducts a comparative advantage analysis of oxidative torrefaction of corn stalks to explore the benefits of oxidative torrefaction for upgrading biochar fuel properties. The results show that oxidative torrefaction is more efficient in achieving mass loss, energy density improvement, elemental carbon accumulation, and surface functional groups removal, leading to better fuel properties. The study also establishes a linear correlation between comprehensive pyrolysis index, torrefaction severity index, and elemental carbon and oxygen component variation.