期刊
FUEL
卷 259, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2019.116263
关键词
Acacia nilotica; Torrefaction; Non-isothermal kinetics; Thermodynamic parameter; Reaction mechanism
资金
- Science and Engineering Research Board (SERB), Government of India, New Delhi, India [SR/FTP/ETA-56/2012]
The objective of this work is to examine the suitability of torrefied biomass for bio-energy generation by investigating its physicochemical characteristics, kinetic and thermodynamic parameters as well as reaction mechanism during pyrolysis. Thus, torrefaction of Acacia nilotica was performed in a fixed bed reactor at 220, 250 and 280 degrees C, with constant residence time (40 min) and heating rate (15 degrees C/min). Pyrolysis of torrefied biomass obtained at 220 degrees C (T-220), 250 degrees C (T-250) and 280 degrees C (T-280) was performed using thermogravimetric analyzer at three different heating rate viz. 5, 10 and 15 K/min. Further, isoconversional models namely, KissingerAkahira-Sunose (KAS), Ozawa-Wall-Flynn (OWF), Friedman and Starink were employed to calculate the kinetic parameters (activation energy and pre-exponential factor) of raw and torrefied biomass. Using kinetic parameters obtained from KAS method, thermodynamic parameters (enthalpy, Gibbs free energy, and entropy) were calculated at a heating rate of 10 K/min. The activation energy for raw and T-220, T-250, and T-280 using KAS method were found to be 221.49, 241.58, 185.06, and 121.83 kJ/mol, respectively. The increase in activation energy of T-220 might be due to a higher percentage of cellulose content in it than raw biomass. Reaction mechanism during pyrolysis of raw and torrefied biomass was predicted using Criado method (Z-master plot). For raw biomass and T-220, diffusion models were followed; however, for T-250 and T-280, random nucleation models were dominant. Overall, results provide a deep understanding of kinetics and improved characteristics of torrefied biomass as good quality solid fuel.
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