Application of Weibull 2-Mixture Model To Describe Biomass Pyrolysis Kinetics

摘要

In the present paper, a new method proposed allows for fitting an overall thermogravimetric analysis (TGA) curve of biomass pyrolysis by means of the modified survival function of a two-mixed Weibull distribution. Four types of biomass (wheat straw, corn stalk, cotton stalk, and sorghum stalk) have been analyzed. It has been found that the Weibull 2-mixture model can reproduce accurately the TGA curve. Accordingly, the TGA curve can be understood as a sum of two parallel reactions, where each single reaction is represented by one Weibull mixture model component. The separation into single functions provides an approach to separate two parallel reactions of two pseudo-fractions involved in the process of biomass pyrolysis. Additionally, making use of the analytical curves of the fitting, the Arrhenius 2-mixture model has been applied to the same raw TGA curves.