Formation of coke during the pyrolysis of bio-oil
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Bio-oil from the pyrolysis of biomass can be upgraded into high quality liquid biofuels or utilised as a feedstock to boilers and gasifiers. The coke formation is a particularly serious problem for the upgrading of bio-oil as well as the direct utilisation of bio-oil. The effects of bio-oil chemical composition on the coke formation are keys to the understanding of the mechanism of coke formation. A bio-oil sample produced from the fast pyrolysis of mallee wood at 500 °C and the lignin-derived oligomers separated from the bio-oil were pyrolysed in a two-stage fluidised-bed/fixed-bed reactor at temperatures between 250 and 800 °C. In addition to the quantification of coke yield, UV-fluorescence spectroscopy was used to trace the formation and evolution of aromatic ring systems during pyrolysis. Our results indicate that both water-soluble and water-insoluble bio-oil fractions can form coke even at very low temperatures. The interactions among the species derived from cellulose/hemicellulose and lignin, especially the interactions involving their oligomers, are important to the observed coke yield, especially at low temperatures.
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Gao, Wenran; Zhang, Mingming; Wu, Hongwei (2018)This study investigates bed agglomeration during fast pyrolysis of bio-oil in a fluidized-bed reactor at temperatures of 500-800 °C. The samples used include bio-oil, bio-oil water-soluble fraction (WSF), bio-oil ...
Wang, Yi (2012)The pyrolysis of biomass is a very effective means of energy densification. With the bio-char returned to the field as a soil conditioner and for carbon bio-sequestration, bio-oil can be used in many ways, including being ...
Kadarwati, S.; Hu, X.; Gunawan, R.; Westerhof, R.; Gholizadeh, M.; Hasan, M.; Li, Chun-Zhu (2016)This study aims to investigate the coke formation during the hydrotreatment of bio-oil at low temperature. The catalytic hydrotreatment of bio-oil produced from the pyrolysis of mallee wood was carried out using pre-sulphided ...