APPLICATION OF SELECTED METHODS OF THERMAL ANALYSIS IN DETERMINATION OF THERMAL DECOMPOSITION KINETICS OF BIOMASS

摘要

The paper describes the utilization of thermal analysis methods for determination of the kinetics of biomass pyrolysis using as an example thermal decomposition of xylan from birch,which is considered to be one of the main components of plant biomass.The experiments were carried out non-isothermally in the temperature range from 30 to 1000 deg C in the atmosphere of argon.In the presentlstudy,the decomposition rates were measured using a thermobalance reactor coupled with a mass spectrometer to get information about gaseous products evolved from the sample at various temperatures.The experimental data were used to estimate the parameters (activation energy,pre-exponential factor and reaction order)for groups of reactions occurring during the pyrolysis of xylan.Three,various methods of parameter estimation (isoconversion method,Kissinger method and non-linear regression)were employed.The quality of kinetic parameters obtained by different methods was verified by comparison of the TG and DTG profiles predicted by the rate equation with the experimental ones.