Assessing the suitability of recovering shrub biowaste involved in wildland fires in the South of Europe through torrefaction mobile units

Dupont, Capucine; Perez, Denilson da Silva; Míguez-Rodríguez, Luis; Grateau, Maguelone; Thiéry, Sébastien; Tamminen, Tarja; Meyer, A.; Gourdon, Christophe

doi:10.1016/j.jenvman.2019.02.019

Cited by 12 publications

(15 citation statements)

References 48 publications

(75 reference statements)

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“…Some of these results conflicts may be due to the different proportion of each component (branches, needles, bark and top) in the analysed samples, whose HHV values are in some cases different. For example Viana et al [27] Relative to the values of higher heating value in shrub species, Pterospartum tridentatum and Ulex europaeus were the lowest species (20.2 MJ•kg −1 and 19.41 MJ•kg −1 , respectively), being very similar values to the study by Martinez-Gonzalez et al [32] in Galicia (Spain).…”

Section: Higher Heating Valuesupporting

confidence: 68%

Thermal Properties of Residual Agroforestry Biomass of Northern Portugal

et al. 2019

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Biomass from forestry and agricultural sector provides an important contribution to encounter the government’s targets for increasing bioenergy production and utilization. Characterization of agricultural and forest wastes are critical for exploiting and utilizing them for energy purpose. In the present work agricultural and forest wastes and shrubs were sampled in two sites in north Portugal (Ave and Sabor basin) and subjected to Higher Heating Value (HHV) and chemical composition quantification. The HHV was evaluated according to the methodology described in Standard DD CEN/TS14918:2005. For the lignin content, the procedure was made by the Klason method and the extractives content was determined with the Soxhlet method. For agricultural and forest wastes the HHV values are identical with a range of 17 to 21 MJ·kg−1. However, shrubs biomass presentx slightly higher and statistically different values from agricultural and forest wastes, varying between 19 and 21 MJ·kg−1. Forest wastes contain higher levels of holocellulose compared to agricultural wastes and, with respect to extractive contents, this trend is the reverse. There is a general tendency for the woody components present thermo-chemical properties more suited for energy purposes, than the residues formed by the branches and leaves.

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Section: Higher Heating Valuesupporting

confidence: 68%

Thermal Properties of Residual Agroforestry Biomass of Northern Portugal

et al. 2019

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“…The production of lignin-base phenolic compounds, namely syringol and guaiacol, tended to be anti-correlated to a decrease in lignin content [49,50]. This might indicate that a decrease in lignin content leaded to a higher production of phenolic compounds, while a decrease in cellulose or hemicelluloses content leaded to furans and ketones release [7,41,51]. These results were in agreement with deciduous wood main composition on cellulose and hemicelluloses, which principally produce furans, ketones and acids [7,24,41].…”

Section: All Biomass Samplessupporting

confidence: 72%

Assessing the impact of woody and agricultural biomass variability on its behaviour in torrefaction through Principal Component Analysis

Floquet

Dupont

Perez³

et al. 2020

Biomass and Bioenergy

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The influence of biomass macromolecular composition on its behaviour in torrefaction was statistically assessed through Principal Component Analysis (PCA), both in terms of solid conversion kinetics and volatile species released, in function of the operating conditions. The experimental data obtained in the torrefaction of 14 woody and agricultural biomass samples at lab-scale was analysed. Main biomass macromolecular composition on cellulose, hemicelluloses and lignin was shown to acceptably represent biomass diversity, which can be complemented by the extractives and ash content. Similitudes were found in deciduous and coniferous wood families, respectively, while agricultural and herbaceous crops were shown as more heterogeneous, both in terms of characterization and behaviour in torrefaction. Cellulose, hemicelluloses and lignin content strongly influenced solid and volatile species yields in torrefaction, while biomass family exhibited a lower impact. Ash content in potassium, phosphorous and silicon did not show any influence on the extent of solid degradation through torrefaction. A lower variability was found in solid degradation profiles from woods, while agricultural crop behaviour was more heterogeneous. Different volatile species were released from biomass samples from the same family. Furthermore, different production profiles were found for volatile species chemically close, except for deciduous wood. These results indicate that, when modelling biomass torrefaction, solid mass loss can be represented by an exemplar of deciduous and coniferous wood, while several species would be required for the agricultural family. The variability of the volatile species release would require the consideration of several volatile species and several biomass samples per family.

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“…The distribution of the torrefaction products depends on the temperature and residence time, as well as on biomass characteristics [10][11][12]. At 300 • C, torrefaction gaseous products typically contain between 10 and 30% of water, from 4 to 20% of CO and CO 2 and minor condensable species [13,14].…”

Section: Introductionmentioning

confidence: 99%

Torrefaction of Woody and Agricultural Biomass: Influence of the Presence of Water Vapor in the Gaseous Atmosphere

et al. 2020

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Biomass preheating in torrefaction at an industrial scale is possible through a direct contact with the hot gases released. However, their high water-content implies introducing moisture (around 20% v/v) in the torrefaction atmosphere, which may impact biomass thermochemical transformation. In this work, this situation was investigated for wheat straw, beech wood and pine forest residue in torrefaction in two complementary experimental devices. Firstly, experiments in chemical regime carried out in a thermogravimetric analyzer (TGA) showed that biomass degradation started from lower temperatures and was faster under a moist atmosphere (20% v/v water content) for all biomass samples. This suggests that moisture might promote biomass components’ degradation reactions from lower temperatures than those observed under a dry atmosphere. Furthermore, biomass inorganic composition might play a role in the extent of biomass degradation in torrefaction in the presence of moisture. Secondly, torrefaction experiments on a lab-scale device made possible to assess the influence of temperature and residence time under dry and 100% moist atmosphere. In this case, the difference in solid mass loss between dry and moist torrefaction was only significant for wheat straw. Globally, an effect of water vapor on biomass transformation through torrefaction was observed (maximum 10%db), which appeared to be dependent on the biomass type and composition.

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Assessing the suitability of recovering shrub biowaste involved in wildland fires in the South of Europe through torrefaction mobile units

Abstract: Assessing the suitability of recovering shrub biowaste involved in wildland fires in the South of Europe through torrefaction mobile units.

Cited by 12 publications

References 48 publications

Thermal Properties of Residual Agroforestry Biomass of Northern Portugal

Thermal Properties of Residual Agroforestry Biomass of Northern Portugal

Assessing the impact of woody and agricultural biomass variability on its behaviour in torrefaction through Principal Component Analysis

Torrefaction of Woody and Agricultural Biomass: Influence of the Presence of Water Vapor in the Gaseous Atmosphere

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