Biomass torrefaction for energy purposes – Definitions and an overview of challenges and opportunities in Brazil

Silva, Carlos Miguel Simões da; Carneiro, Angélica de Cássia Oliveira; Vital, Benedito Rocha; Figueiró, Clarissa Gusmão; Fialho, Lucas de Freitas; Magalhães, Mateus Alves de; Carvalho, Amélia Guimarães; Cândido, Welliton Lelis

doi:10.1016/j.rser.2017.08.095

Cited by 89 publications

(37 citation statements)

References 53 publications

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“…Furthermore, the extractive content is another factor that can contribute to the increase of the charcoal yield. Some chemical constituents present in the extractives, especially those of an aromatic nature, that have greater stability to the thermal degradation, thus increasing the charcoal yield (Silva et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Slow pyrolysis of bamboo: an approach on quality of charcoal and greenhouse gases emission

Fialho

Carneiro

Figueiró

et al. 2019

Agraria

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Bamboo is a grass known worldwide for its versatility, fast growth and short rotation. The combination of these characteristics makes the species a potential source of biomass for energy use, especially when submitted to a thermochemical conversion treatment, such as pyrolysis. However, the environment aspects of the pyrolysis should be observed, like the emission of greenhouse gases. In this context, the aim of this study was to characterize the proprieties the charcoal and the emission of greenhouse gases of Dendrocalamus asper (Schult f.) Backer ex Heyne, in different pyrolysis temperature (400, 550, 700 °C). The charcoal properties are influenced by the pyrolysis temperature. The increase in the final pyrolysis temperature resulted in a reduction of around 24,5% in the values of charcoal yield and caused an increase in the emission of greenhouse gases (CO 2 , CO, CH 4 , and H 2). Despite the advantages of performing pyrolysis as a thermal treatment, ways to mitigate such emissions are one aspect that has to be evaluated.

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Section: Resultsmentioning

confidence: 99%

Slow pyrolysis of bamboo: an approach on quality of charcoal and greenhouse gases emission

Fialho

Carneiro

Figueiró

et al. 2019

Agraria

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“…As was previously mentioned, torrefaction (specifically, dry torrefaction) consists of a thermal treatment of biomass, where biomass is heated in a non-oxidizing atmosphere to improve the biomass' energy density through the increase of its HV and hydrophobicity [16,[30][31][32].…”

Section: Torrefaction Processmentioning

confidence: 99%

Future Perspectives of Biomass Torrefaction: Review of the Current State-Of-The-Art and Research Development

et al. 2018

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Abstract:The growing search for alternative energy sources is not only due to the present shortage of non-renewable energy sources, but also due to their negative environmental impacts. Therefore, a lot of attention is drawn to the use of biomass as a renewable energy source. However, using biomass in its natural state has not proven to be an efficient technique, giving rise to a wide range of processing treatments that enhance the properties of biomass as an energy source. Torrefaction is a thermal process that enhances the properties of biomass through its thermal decomposition at temperatures between 200 and 300 • C. The torrefaction process is defined by several parameters, which also have impacts on the final quality of the torrefied biomass. The final quality is measured by considering parameters, such as humidity, heating value (HV), and grindability. Studies have focused on maximizing the torrefied biomass' quality using the best possible combination for the different parameters. The main objective of this article is to present new information regarding the conventional torrefaction process, as well as study the innovative techniques that have been in development for the improvement of the torrefied biomass qualities. With this study, conclusions were made regarding the importance of torrefaction in the energy field, after considering the economic status of this renewable resource. The importance of the torrefaction parameters on the final properties of torrefied biomass was also highly considered, as well as the importance of the reactor scales for the definition of ideal protocols.

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“…Wood damage was recorded in all treatments, indicating that torrefaction did not fully protect the wood. The attack degree decreased with increasing temperature with lower mass losses in torrefaction [17][18][19][20]. The microorganisms quantity in the termite intestine may become insufficient to digest cellulose, influencing the eating habits of these insects, which could lead to their death [21].…”

Section: Resultsmentioning

confidence: 99%

Resistance of the Eucalyptus Wood in Natura and Torrefied Exposed to the Attack of Cryptotermes brevis

Castro¹,

Pereira²,

Surdi³

et al. 2018

JAST-B

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The reduced natural durability and low energy density of eucalyptus wood hampers its use to generate energy. Torrefaction or pre-carbonization, treatment in low oxygenation with temperatures between 200 °C and 300 °C, accumulates carbon and lignin, decreases hygroscopicity, increases energy efficiency and reduces the wood attractiveness to xylophagous organisms, such as termites. Therefore, this work had as its main aim to study the influence of the roasting temperature on the endurance of the Eucalyptus urophylla wood in natura as well as roasted, both exposed to the attack of dry-wood termites. To the execution of this study, in natura wood chips and torrefied chips (torrefied for 20 min at the following temperatures: 180, 220 and 260 °C) were submitted to the dry-wood termite resistance test. In this experiment, termites of the Cryptotermes brevis species were used. After 45 d of exposure, it was possible to observe that the torrefied treatment presented a greater resistance that consequently increased the endurance when exposed to the termite's attack, observing that the control sample, loss five times more than mass than the chips torrefied at 260 °C. Besides, in the treatment with in natura chips, was observed less mortality of the termites and greater visual damage, confirming the lower durability of such material compared to torrefied chips.

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Biomass torrefaction for energy purposes – Definitions and an overview of challenges and opportunities in Brazil

Cited by 89 publications

References 53 publications

Slow pyrolysis of bamboo: an approach on quality of charcoal and greenhouse gases emission

Slow pyrolysis of bamboo: an approach on quality of charcoal and greenhouse gases emission

Future Perspectives of Biomass Torrefaction: Review of the Current State-Of-The-Art and Research Development

Resistance of the Eucalyptus Wood in Natura and Torrefied Exposed to the Attack of Cryptotermes brevis

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