Abstract: Forest fire is a natural disaster that damages forest resources seriously, and once started, it spreads rapidly in the forest and is not easy to be extinguished. Therefore, it is of great practical importance to study and analyze the pyrolysis characteristics of combustible materials in the forest. In this paper, we analyzed the pyrolysis process of humus using TG-DTG curves in an artificial broad-leaved red pine forest in Mao'er Mountain. The experimental data were analyzed using Coats-Redfern(CR) method, Doyle method, Flynn-Wall-Ozawa(F-W-O) method, and four typical equations of distributed activation energy model (DAEM) for kinetic modeling, and the reaction activation energy, reaction level and frequency factor were calculated respectively. The experimental results showed that the pyrolysis of humus was mainly divided into four stages: dehydration stage, transition stage, major weight loss stage and carbonization stage. The kinetic parameters of the major weight loss stages were calculated, and the results showed that the Doyle method and the DAEM model were more suitable for the kinetic analysis of the pyrolysis of humic substances than the other two equations. Among them, the DAEM model is suitable for analyzing the trend of activation energy of samples, and the Doyle method is suitable for finding the activation energy at different weight loss rates.

Key words: broad-leaved red pine forest, humus, pyrolysis characteristics, kinetic of the pyrolysis