Hydrothermal carbonization of lignocellulosic biomass: Effect of process conditions on hydrochar properties

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/58108
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Title: Hydrothermal carbonization of lignocellulosic biomass: Effect of process conditions on hydrochar properties
Authors: Mäkelä, Mikko | Benavente Domenech, Verónica | Fullana, Andres
Research Group/s: Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos
Keywords: Biosolids | Experimental design | Hydrothermal treatment | Response surface methodology | Sludge
Knowledge Area: Ingeniería Química
Issue Date: 1-Oct-2015
Publisher: Elsevier
Citation: Applied Energy. 2015, 155: 576-584. doi:10.1016/j.apenergy.2015.06.022
Abstract: Although hydrothermal carbonization of biomass components is known to be mainly governed by reaction temperature, consistent reports on the effect and statistical significance of process conditions on hydrochar properties are still lacking. The objective of this research was to determine the importance and significance of reaction temperature, retention time and solid load on the properties of hydrochar produced from an industrial lignocellulosic sludge residue. According to the results, reaction temperature and retention time had a statistically significant effect on hydrochar ash content, solid yield, carbon content, O/C-ratio, energy densification and energy yield as reactor solid load was statistically insignificant for all acquired models within the design range. Although statistically significant, the effect of retention time was 3–7 times lower than that of reaction temperature. Predicted dry ash-free solid yields of attained hydrochar decreased to approximately 40% due to the dissolution of biomass components at higher reaction temperatures, as respective oxygen contents were comparable to subbituminous coal. Significant increases in the carbon contents of hydrochar led to predicted energy densification ratios of 1–1.5 with respective energy yields of 60–100%. Estimated theoretical energy requirements of carbonization were dependent on the literature method used and mainly controlled by reaction temperature and reactor solid load. The attained results enable future prediction of hydrochar properties from this feedstock and help to understand the effect of process conditions on hydrothermal treatment of lignocellulosic biomass.
Sponsor: This work was performed in cooperation with SCA Obbola AB with partial funding from SP Processum AB.
URI: http://hdl.handle.net/10045/58108
ISSN: 0306-2619 (Print) | 1872-9118 (Online)
DOI: 10.1016/j.apenergy.2015.06.022
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 Elsevier Ltd.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.apenergy.2015.06.022
Appears in Collections:INV - REMAN - Artículos de Revistas

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