Abstract: Using the TA Q600 synchronous thermal analyzer, the 2～3 mg pinecone particles with a particle size of 250～420 μm were linearly heated to about 1 073 K at the heating rate of 10 K/min, 15 K/min, 20 K/min and 25 K/min in an air atmosphere. Model fitting method (Coats-Redfern method, Zsako method, Satava-Sestak method) and no model fitting method (KAS method, Doyle method, FWO method) were used to solve and compare the kinetic parameters of pine pyrolysis, and the value of activation energy E and pre-index factor A were calculated. The results show that the pyrolysis of Pinus sylvestris pine cones includes four stages, and the mass loss ratio of the main mass loss stage is more than 85%. The average activation energies obtained by the modelless fitting method were 74.3 kJ/mol (Doyle method), 71.8 kJ/mol (FWO method) and 68.3 kJ/mol (KAS method), respectively, and the fitting curves of the activation energies of KAS method and the predigital factor were > 0.95. The average activation energies obtained by model fitting were 65.4 kJ/mol (Zsako method), 62.4 kJ/mol (Satava-Sestak method), 56.4 kJ/mol (Coats-Redfern). The average activation energy of Zsako method, and Satava-Sestak method is closer to the activation energy without model, and the pre-exponential factor of Satava-Sestak method can reflect the complexity of the pyrolysis reaction mechanism. This paper suggests that KAS method and Satava-Sestak method should be combined to better evaluate the burning property of Pinus sylvestris pine cones.

Key words: Pinus sylvestris pine cones, thermogravimetric analysis, model-free fitting method, model-fitting method, dynamics