Influence of particle size and density of pelleted samples of forest fuel on thermokinetic characteristics of pyrolysis and oxidation

Thermal Science

Lyrsсhikov Sergei Yu¹  Kropotova Svetlana S.²  Islamova Anastasia G.²  Kuznetsov Geniy V.² 

[1] Federal Research Center of Coal and Coal Chemistry of Siberian Branch of the RAS, Kemerovo, Russia;National Research Tomsk Polytechnic University, Tomsk, Russia;

关键词: forest fuel;    thermogravimetric analysis;    pre-exponential factor;    inert medium;    oxidizing medium;    activation energy;   

DOI  :  10.2298/TSCI200124134K

来源: DOAJ

【 摘 要 】

This paper presents the results of experimental studies of thermokinetic characteristics of pyrolysis and oxidation of pine needles, taking into account the influence of particle size and density of forest fuel in pelleted samples. The sample densities range within 206-955 kg/m3 (i.e. from typical sample densities to average ones for pressed pelleted samples), and the component particle sizes amount to 60-140 μm. The range of studied temperatures is 20-1000°С. The particle size and density of the material are found to be important parameters that significantly affect the kinetics of pyrolysis. According to the results of measurements, the activation energy of needles pyrolysis is within the range of 22.8-113.8 kJ/mol, and that of oxidation corresponds to 134.7-211 kJ/mol. Three intervals with significantly different values of activation energy and pre-exponential factor are distinguished in the studied temperature range. Approximation expressions are formulated for the activation energies of pyrolysis and oxidation as functions of forest fuel particle sizes, sample density and temperature.

【 授权许可】

Unknown