Effect of hydrothermal carbonization on the combustion and gasification behavior of agricultural residues and macroalgae: devolatilization characteristics and char reactivity

Lane, Daniel J., Truong, Ewan, Larizza, Francesca, Chiew, Precilla, de Nys, Rocky, and van Eyk, Philip J. (2018) Effect of hydrothermal carbonization on the combustion and gasification behavior of agricultural residues and macroalgae: devolatilization characteristics and char reactivity. Energy & Fuels, 32 (4). pp. 4149-4159.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: https://doi.org/10.1021/acs.energyfuels....
1


Abstract

Hydrothermal carbonization (HTC) can potentially improve the fuel quality of low-value biomass resources that are otherwise unsuitable for use in industrial heat and power applications. The effect of HTC pretreatment on the combustion and gasification behavior of two agricultural residues (grape marc and sugar cane bagasse) and a freshwater species of macroalgae was investigated, with an emphasis on devolatilization behavior and char reactivity. HTC was carried out in a custom-built, laboratory-scale, batch reactor at three temperatures, 180, 220, and 260 °C, with a slurry density of 15% w/w dry biomass in water. The volatile release behavior of the collected products (hydrochars) and untreated biomass feedstocks were characterized by dynamic thermogravimetric analysis. Char reactivity was characterized by isothermal gasification of samples of the hydrochars and untreated biomass in a thermobalance in carbon dioxide, following fast pyrolysis of the samples in a separate fixed-bed batch reactor. Hydrochars were more energy-dense and contained lower concentrations of catalytic metals, particularly K and Na, than the untreated biomass feedstocks. HTC caused a significant reduction in the total release of volatiles and an increase in the yield of char during devolatilization. The bulk of the volatile matter was released at higher devolatilization temperatures for the hydrochars. These trends became more pronounced with increasing HTC temperature from 180 to 260 °C. The char components of grape marc and macroalgae became substantially less reactive following HTC. The char component of bagasse became more reactive following HTC at 180 °C but became less reactive following HTC at 220 and 260 °C. Activation energies for char gasification of HTC-treated (220 °C) grape marc, bagasse, and macroalgae in CO2, were 177, 247, and 282 kJ mol–1, respectively. These values are 92%, 10%, and 52% greater than the values for the untreated biomass.

Item ID: 53810
Item Type: Article (Refereed Research - C1)
ISSN: 1520-5029
Date Deposited: 27 Aug 2018 22:27
FoR Codes: 10 TECHNOLOGY > 1003 Industrial Biotechnology > 100302 Bioprocessing, Bioproduction and Bioproducts @ 50%
09 ENGINEERING > 0904 Chemical Engineering > 090405 Non-automotive Combustion and Fuel Engineering (incl Alternative/Renewable Fuels) @ 50%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850501 Biofuel (Biomass) Energy @ 100%
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page