The droplet combustion and thermal characteristics of pinewood bio-oil from slow pyrolysis

S.I. Yang and M.S. Wu

Energy, 2017, vol. 141, issue C, 2377-2386

Abstract: The present study investigated the production procedure and combustion characteristics of a bio-oil produced through the slow pyrolysis of pinewood. The combustion properties of droplets with different butanol/bio-oil proportions were thus determined and compared. The droplets containing bio-oil varied irregularly in size during combustion and left considerable residue that was also combusted. The duration of combustion was revealed to increase when the bio-oil concentration was increased. The TGA indicated a two-stage weight loss during combustion. The first stage occurred at 30-160 °C, corresponding to the endothermic evaporation of the light fraction of the compounds after heating. The second stage occurred at 450-650 °C, indicating pyrolytic exothermic residue combustion fed by the macromolecular residue of the interactions between bio-oil constituents. The activation energy was demonstrated to gradually decrease during the evaporation stage and also during the residue combustion stage. The aromatics in the bio-oil polymerized under the intense heat, leading to the formation of residue and soot. The burning rate of the droplet decreased when the bio-oil concentration was increased, whereas the residue burning rate increased with an increase in bio-oil concentration. The volatiles released during residue combustion enhanced the burning rate of residue.

Keywords: Bio-oil; Droplet; Combustion; Burning rate; Thermogravimetric analysis; Gas chromatography-mass spectrometry (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:141:y:2017:i:c:p:2377-2386

DOI: 10.1016/j.energy.2017.11.119

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