Original scientific paper

https://doi.org/10.15255/KUI.2015.028

Pyrolysis Characteristics and Kinetics of Phoenix Tree Residues as a Potential Energy

H. Li ; Nanjing Agricultural University, 210 031 Nanjing, P.R. China
X.-H. Li ; Nanjing Agricultural University, 210 031 Nanjing, P.R. China
L. Liu ; Nanjing Agricultural University, 210 031 Nanjing, P.R. China
K.-Q. Li ; Nanjing Agricultural University, 210 031 Nanjing, P.R. China
X.-H. Wang ; Nanjing Agricultural University, 210 031 Nanjing, P.R. China

Abstract

By using a thermogravimetric analyser under argon atmosphere, the pyrolysis process and the kinetic model of phoenix tree residues (the little stem, middle stem, and leaf) at a 30 °C min−1 heating rate and the phoenix tree mix at three different heating rates (10 °C min−1, 30 °C min−1, and 50 °C min−1) were examined. The catalyst and the co-pyrolysis samples were at a 30 °C min−1 heating rate. The catalysts were Na₂CO₃, ZnCl₂ and CaO in a mass fraction of 5 %. The experimental results revealed that the phoenix tree residues pyrolysis process consisted of three stages: dehydration stage, main pyrolysis stage, and the slow decomposition of residues. As the heating rate increased, the pyrolysis characteristic temperature of the phoenix tree grew, there was a backward-shift of the pyrolysis rate curve, and the mass loss rate gradually increased. The phoenix tree residues’ activation energy changed throughout the whole pyrolysis process, and the pyrolysis temperature ranges of the three main components (cellulose, hemicellulose, and lignin) existed in overlapping phenomenon. As compared to the little stem, middle stem, and leaf, the phoenix tree mix was more likely to be pyrolysed under the same heating rate. Different catalysts had a different impact on the pyrolysis: ZnCl₂ moved the start point of the reaction to the lower temperatures, but did not speed up the reaction; Na₂CO₃ speeded up the reaction without changing the start point of the reaction; CaO speeded up the reaction, moved the start point of the reaction to higher temperatures.

Keywords

Phoenix tree residues; pyrolysis; thermogravimetric analysis; kinetics; catalysts

Hrčak ID:

145122

URI

https://hrcak.srce.hr/145122

Publication date:

17.9.2015.

Article data in other languages: croatian

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