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

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 ) were examined. The catalyst and the co-pyrolysis samples were at a 30 °C min −1 heating rate. The catalysts were Na 2 CO 3 , ZnCl 2 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: ZnCl 2 moved the start point of the reaction to the lower temperatures, but did not speed up the reaction; Na 2 CO 3 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.

White Poplar Microwave Pyrolysis: Heating Rate and Optimization of Biochar Yield

“…The pyrolysis time was selected based on the authors' previous research on the pyrolysis of phoenix tree residue (Li et al 2015). When the temperature was at 550 °C the pyrolysis was completed.…”