Effects of carbonisation conditions on the yield and chemical composition of Acacia and Eucalyptus wood chars

Kumar, Manish; Gupta, R. C.; Sharma, T.

doi:10.1016/0961-9534(92)90037-q

Cited by 56 publications

(28 citation statements)

References 5 publications

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“…The calorific value of biomass is dependent on its chemical composition i.e., cellulose, hemicellulose, lignin, extractives and ash forming minerals (Shafizadeh 1981). Lignin and extractives have lower degree of oxidation and considerably higher heat of combustion in comparison with cellulose and hemicellulose (Kumar et al 1992). The tree-age variability in calorific value of Eucalyptus hybrid trees was found to be practically marginal.…”

Section: Resultsmentioning

confidence: 98%

“…During the combustion process, when the biomass is heated, the volatiles escape first and burn in gaseous state leaving behind the fixed carbon as char, which burns later in solid state. High fixed carbon content adds to high-energy value of plant material (Kumar et al 1992). The fixed carbon content of mature tree was 20.36%, which in general is higher than that of lower age trees.…”

Section: Resultsmentioning

confidence: 98%

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Effect of tree-age on calorific value and other fuel properties of Eucalyptus hybrid

Kumar

Pandey

Chandrashekar

et al. 2010

Journal of Forestry Research

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For determining the effect of tree-age on the fuel properties of Eucalyptus hybrid, the variability in basic density, calorific value, proximate and ultimate parameters of 2−6 years old trees and mature trees (20-year-old), grown under short rotation forestry regime, were measured and analyzed. Results show that there was no significant variation in the basic density of wood for 2−6 year-old Eucalyptus hybrid, with average value of 0.55−0.58 g·cm -3 ; the calorific value of mature trees was higher than that of lower age trees, but the ash content was much higher in lower age trees compared to mature trees. No particular trend was observed for volatile matter content and the fixed carbon content with tree-age. In conclusion, the fuel properties of mature tree were marginally better than trees of lower age.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

Effect of tree-age on calorific value and other fuel properties of Eucalyptus hybrid

Kumar

Pandey

Chandrashekar

et al. 2010

Journal of Forestry Research

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“…O poder calorífico superior é um dos parâmetros importantes para diferenciar uma biomassa de outra quanto ao potencial para geração de energia e é dependente da composição química (celulose, hemiceluloses, lignina e extrativos) da biomassa avaliada (SHAFIZADEH, 1981). A lignina e os extrativos apresentam baixo grau de oxidação e alto calor de combustão em comparação com a celulose e as hemiceluloses (KUMAR et al, 1992), justificando seu uso no presente trabalho como variáveis dependentes. Na Tabela 2, estão apresentados os valores médios para os teores de extrativos totais, lignina, cinzas e o poder calorífico superior (PCS) das biomassas avaliadas.…”

Section: Protásio T P Et Alunclassified

Correlações canônicas entre as características químicas e energéticas de resíduos lignocelulósicos

Protásio

Tonoli

Júnior

et al. 2012

CERNE

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RESUMO:A análise de correlação canônica é um procedimento estatístico multivariado que permite verificar as correlações lineares existentes entre dois grupos ou conjuntos de variáveis (X e Y). No presente trabalho, objetivou-se realizar a análise de correlação canônica para verificar as associações existentes entre o grupo formado pelos teores de lignina, extrativos totais e o poder calorífico superior (PCS) de resíduos lignocelulósicos com o grupo formado pelos teores de seus componentes elementares (carbono, hidrogênio, nitrogênio e enxofre). Foram utilizados oito resíduos lignocelulósicos: maravalhas de eucalipto, pinus e cedro australiano; bagaço de cana; polpa celulósica residual de bambu; casca e pergaminho de café; resíduos da colheita do milho e casca de arroz. Apenas a primeira função canônica mostrou-se significativa, entretanto apresentou baixo R² canônico. Encontrou-se uma tendência de altos teores de carbono, hidrogênio e enxofre e baixos teores de nitrogênio estarem associados com altos teores de extrativos totais dos resíduos lignocelulósicos avaliados. Esses resultados preliminares mostram que as correlações canônicas não foram eficientes para explicar as correlações existentes entre os componentes químicos elementares e os teores de lignina e o poder calorífico superior.Palavras-chave: Estatística multivariada, função canônica, bioenergia. CANONICAL CORRELATIONS BETWEEN CHEMICAL AND ENERGETIC CHARACTERISTICS OF LIGNOCELLULOSIC WASTES ABSTRACT: Canonical correlation analysis is a statistical multivariate procedure that allows analyzing linear correlation that may exist between two groups or sets of variables (X and Y). This paper aimed to provide canonical correlation analysis between a group comprised of lignin and total extractives contents and higher heating value (HHV) with a group of elemental components

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“…Bamboo charcoal is also used as a decolorizing agent for decolorizing sugar solutions, organic preparations, alcohol and petroleum products. Although charcoal can be made from any lignocellulosic raw material, but not all the species produces good quality charcoal (Kumar et al 1992). Quality of charcoal varies with physical, chemical and anatomical properties of species (Kumar et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Characterization of charcoal from some promising bamboo species

Kumar

Chandrashekar

2014

J Indian Acad Wood Sci

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In this study, carbonisation of four bamboo species viz., Bambusa bambos, Dendrocalamus brandisii, D. stocksii and D. strictus was carried out. The effect of carbonisation temperature i.e., 300, 400, 500, 600, 700 and 800°C on yield and fuel properties (calorific value, ash, volatile content, fixed carbon content etc.,) of bamboo charcoal was investigated. The soaking time (1 h) and heating rate (5°C min -1 ) were kept constant for all experiments. A significant reduction in charcoal yield with increase in the carbonisation temperature was observed in all bamboo species. Fixed carbon content and ash content increased with carbonisation temperature, whereas the volatile content and ultimate hydrogen decreased with increase in carbonisation temperature. Charcoal obtained at 600°C was found to have highest calorific value. At this temperature, bamboo charcoal yield, fixed carbon content, ash content and calorific value ranged from 30-32, 75-81, 5-10 % and 28-31 MJ kg -1 , respectively. The combustion characteristic of bamboo charcoal was studied under oxidizing atmosphere using thermogravimetric analyzer. Bamboo charcoals were found to be different in their combustion behaviour, mainly due to difference in chemical and elemental properties of bamboo biomass and temperature at which the charcoals were made.

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Effects of carbonisation conditions on the yield and chemical composition of Acacia and Eucalyptus wood chars

Cited by 56 publications

References 5 publications

Effect of tree-age on calorific value and other fuel properties of Eucalyptus hybrid

Effect of tree-age on calorific value and other fuel properties of Eucalyptus hybrid

Correlações canônicas entre as características químicas e energéticas de resíduos lignocelulósicos

Characterization of charcoal from some promising bamboo species

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