Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 221, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2020.113165
Keywords
Pyrolysis; Thermogravimetric analysis (TGA); Heating rate; Kinetics; Independent parallel reaction (IPR); Particle swarm optimization (PSO)
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Funding
- Ministry of Science and Technology, Taiwan, R.O.C. [MOST 108-2221-E-006-127-MY3, MOST 109-2622-E-006-006CC1, MOST 109-3116-F-006-016-CC1, MOST 109-2221-E-006 -040-MY3]
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The kinetics of lignocellulosic biomass pyrolysis is beneficial for reactor design to efficiently produce biofuel and bioenergy. Pyrolysis is a well-developed thermochemical process that converts biomass into valuable gaseous products, bio-oils, and solid products. To understand the complex pyrolysis process of lignocellulosic biomass, three model components of cellulose, hemicelluloses (xylan), and lignin were pyrolyzed using a thermogravimetric analyzer. An independent parallel reaction (IPR) kinetic model was optimized using a particle swarm optimization (PSO) algorithm. The IPR kinetic models of cellulose, hemicelluloses, and lignin could be modeled with 1 pseudo-reaction, 4 pseudo-reactions, and 5 pseudo-reactions, respectively, and good fit qualities higher than 95% can be achieved (except a few cases for lignin). Four different heating rates of 1, 5, 20, and 40 degrees C.min(-1) were applied to examine the effect of heating rate on the pyrolysis process. When increasing the heating rate, the derivative thermogravimetric (DTG) peaks shifted to a higher temperature range, stemming from the thermal lag between the samples and heating environment. Overall, the temperature ranges of the thermal decomposition for cellulose, hemicelluloses, and lignin were within 269-394, 170-776, and 127-791 degrees C, respectively.
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