Pressurized Thermogravimetric Analysis of Pyrolysis of Biomass

The pressurized thermogravimetric analysis of two biomass samples (sawdust and pine needle) in N_2 was per- formed under different pressures and heating rates.The pyrolysis characteristics were obtained using TG and DTG curves. A pyrolysis index,D,was put forward to describe the biomass pyrolysis characteristics.And kinetic parameters of biomass were also calculated by thermal analysis mathematic method.The results show that the pyrolysis process of biomass can be dealt with as the first order reaction model in two stages for both sawdust and pine needle.With pyrolysis pressure increas- ing,the conversion and the peak in DTG decrease,but the initial temperature of biomass pyrolysis rises.This also results in the pyrolysis index,D,decreases.In addition,the activation energy and frequency factor of both biomass samples vary with different pressures.Under the same pressure,the pyrolysis index D can greatly rise with increasing heating rate.