Thermal pretreatment of wood (Lauan) block by torrefaction and its influence on the properties of the biomass

Chen, Wei‐Hsin; Hsu, Huan-Chun; Lu, Ke-Miao; Lee, Wen‐Jhy; Lin, Tsair Fuh

doi:10.1016/j.energy.2011.02.045

Cited by 239 publications

(127 citation statements)

References 30 publications

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“…Adicionalmente, o briquete é convertido em um combustível com maior poder calorífico, menor teor de materiais voláteis, maior teor de carbono fixo, uniformidade em forma e tamanho, menor relação O/C e baixa umidade (Shafizadeh, 1985;Felfli et al, 2005;Prins et al, 2006;Yan et al, 2009;Chen et al, 2011).…”

Section: Introductionunclassified

“…Este fato está relacionado à degradação térmica das hemiceluloses, resultando na liberação da maioria dos componentes oxigenados e aromatizados. Chen et al (2011) encontraram, para a madeira torrificada na temperatura de 250 ºC e tempo total de 2 h, os valores de 66,73, 5,84, 27,30 e 0,14% para os teores de carbono, hidrogênio, oxigênio e nitrogênio, respectivamente, diferindo do encontrado neste trabalho para os briquetes dos resíduos do processamento dos grãos de café torrificados.…”

Section: Introductionunclassified

“…Já para o briquete carbonizado este incremento foi de aproximadamente 58%. Segundo Chen et al (2011), a temperatura de 250 ºC e um tempo de torrefação superior a 1 h são recomendados para maximizar o poder calorífico da biomassa com menor perda de massa do combustível.…”

Section: Introductionunclassified

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Torrefação e carbonização de briquetes de resíduos do processamento dos grãos de café

Protásio

Bufalino

Mendes

et al. 2012

Rev. bras. eng. agríc. ambient.

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R ESU M OObjetivou-se, nesse trabalho, avaliar os briquetes dos resíduos do processamento dos grãos de café submetidos aos processos de carbonização e torrefação. Os briquetes foram carbonizados utilizandose taxa de aquecimento de 1,67 ºC min -1 com temperatura inicial de 50 ºC e final de 450 ºC, por 30 min. A torrefação dos briquetes foi realizada em uma mufla em duas taxas de aquecimento: 1,5 e 3,0 ºC min -1 até 250 ºC, temperatura mantida durante 60 min. Foram determinados os rendimentos em briquetes torrificados e carbonizados, em líquido pirolenhoso, em gases não condensáveis e em carbono fixo. Para todos os briquetes foram quantificados os teores de carbono fixo, cinzas, voláteis, dos componentes elementares (C, H, N, S, O), o poder calorífico superior, a densidade aparente e energética e a resistência à compressão diametral. Os briquetes carbonizados apresentaram maior potencial energético devido aos elevados teores de carbono fixo e elementar e poder calorífico, porém baixa resistência mecânica. Os briquetes torrificados nas duas taxas de aquecimento consideradas apresentaram características e propriedades energéticas semelhantes mas densidade energética inferior em relação aos briquetes carbonizados e in natura. Palavras-chave: carbono, pirólise, energia, tratamento térmicoTorrefaction and carbonization of briquettes made with residues from coffee grain A B ST R A C T This research aimed to evaluate the briquettes made with residues from processing of coffee grain submitted to carbonization and torrefaction. The briquettes were carbonized at a heating rate of 1.67 ºC min -1 with initial temperature of 50 ºC and final of 450 ºC, which was kept during 30 min. The torrefaction of the briquettes was made in a muffle furnace at two heating rates: 1.5 and 3.0 ºC min -1 until 250 ºC, temperature kept during 60 min. The yields in torrefied and carbonized briquettes, pyroligneous liquor, non-condensable gases and fixed carbon were determined. For all briquettes the fixed carbon, ash, volatile and elemental components (C, H, N, S, O) contents and higher heating value, apparent and energetic density and resistance to diametric compression were quantified. The carbonized briquette presented high energetic potential due to higher fixed and elemental carbon content and heating value, but had low mechanical resistance. The briquettes torrified at the two considered heating rates presented similar energetic properties and characteristics, but lower energetic density than carbonized and fresh briquettes.

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Section: Introductionunclassified

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Torrefação e carbonização de briquetes de resíduos do processamento dos grãos de café

Protásio

Bufalino

Mendes

et al. 2012

Rev. bras. eng. agríc. ambient.

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“…The trend shows that a higher mass loss leads to enrichment in fixed carbon. The linear model remained within the confidence interval at 95% but showed a weaker correlation (R 2 = 0.66) than that obtained on wood (Chen et al 2011). Table 1 shows that the highest percentages of fixed carbon corresponded to the highest temperatures, with the FC% equal to 36.55, 27.95, and 19.75% at 280, 250, and 220°C, respectively for 30 min.…”

Section: Overall Resultsmentioning

confidence: 83%

“…It is a mild pyrolysis process carried out at temperatures ranging from 200 to 280°C under atmospheric pressure in the presence of limited or no oxygen (Van der Stelt et al 2011). The advantages of torrefaction include removing water uptake properties, eliminating biomass decomposition, reducing grinding energy requirements (Chen et al 2011), and creating a more uniform fuel for pulverized systems.…”

Section: Introductionmentioning

confidence: 99%

Torrefaction of Babassu: A Potential Utilization Pathway

Rousset¹,

Aguiar²,

Volle³

et al. 2012

BioResources

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Because of its energy and mechanical properties, babassu shell is a promising energy crop for the future. Its production potential in Brazil is estimated at 6.8 million tons of fruits/year. The aim of this study was to evaluate the effects of torrefaction on the main energy and mechanical properties of Orbignya speciosa (Babassu). Three different torrefaction temperatures (220, 250, and 280°C) and two different durations (15 and 30 minutes) were employed. The influence of sample orientation was taken into account. The results showed that the energy properties of babassu are greatly improved during heat treatment. Torrefaction also led to uniform resistance to babassu shell compression. It was found that low temperature treatment was sufficient to envisage grinding and babassu use in pulverulent form.

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Wärmeinduzierte Vorbehandlung lignocellulosehaltiger Biomassen – Prozesse, Verfahren und deren Einordnung

Scherzinger

Kulbeik

Grumbrecht

et al. 2019

Chemie Ingenieur Technik

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Im Folgenden werden verschiedene Verfahren einer wärmeinduzierten Vorbehandlung lignocellulosehaltiger Biomassen zur Erzeugung von Festbrennstoffen beschrieben. Dabei wird auch auf die in der Biomasse auf molekularer Ebene ablaufenden Veränderungen eingegangen. Die beschriebenen Verfahren (Torrefizierung, hydrothermale Carbonisierung, vapothermale Carbonisierung und Autoklavierung) laufen bis zu einem Temperaturniveau von 300°C ab. Abschließend erfolgt eine Einordnung dieser Verfahren zur Einschätzung der spezifischen Vor-und Nachteile.In the following, different techniques for a heat-induced pretreatment of lignocellulosic biomass for the production of solid fuels are described. Thereby, also changes at the molecular level of the biomass are discussed. The discussed techniques (torrefaction, hydrothermal carbonization, vapothermal carbonization, and autoclaving) proceed in a temperature range up to 300°C. Finally, a classification of the different techniques takes place to evaluate the specific advantages and disadvantages.

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Thermal pretreatment of wood (Lauan) block by torrefaction and its influence on the properties of the biomass

Cited by 239 publications

References 30 publications

Torrefação e carbonização de briquetes de resíduos do processamento dos grãos de café

Torrefação e carbonização de briquetes de resíduos do processamento dos grãos de café

Torrefaction of Babassu: A Potential Utilization Pathway

Wärmeinduzierte Vorbehandlung lignocellulosehaltiger Biomassen – Prozesse, Verfahren und deren Einordnung

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