Blends of charcoal fines and wood improve the combustibility and quality of the solid biofuels

Júnior, Ananias Francisco Dias; Suuchi, Mariana Aya; Neto, Analder Sant’Anna; Silva, João Gabriel Missia da; Silva, Álison Moreira da; Souza, Natália Dias de; Protásio, Thiago de Paula; Brito, José Ótávio

doi:10.1007/s12155-020-10179-8

Cited by 16 publications

(8 citation statements)

References 43 publications

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“…Briseño-Uribe et al, 2016 obtained lower ash contents for charcoal (2.0-8.2%) [35]. Júnior et al, 2020 reported lower ash contents (6.6%) for charcoal [34].…”

Section: Physical Propertiesmentioning

confidence: 98%

“…The moisture content results for charcoal produced from all firewood species except for Piliostigma thonningii firewood species conform to European standard EN 1860-20 which states that ash content should not exceed 8% (EN 1860-2) [38] Volatile matter ranged between 45.7 -63.9% and 9.8 -16.9% for firewood and resulting charcoal produced, respectively. Charcoal has less volatile matter than firewood as most of the volatiles are given off during pyrolysis of firewood to form charcoal [34,37]. Dichrostachys cinerea firewood and charcoal had the highest and lowest volatile matter composition, respectively.…”

Section: Surface Morphologymentioning

confidence: 99%

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Thermal and mechanical characteristics of local firewood species and resulting charcoal produced by slow pyrolysis

Lubwama

Yiga

Ssempijja

et al. 2021

Biomass Conv. Bioref.

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The main source of fuel for domestic cooking applications in Sub-Saharan Africa is either locally available firewood species or charcoal produced by slow pyrolysis of these species. However, very few studies exist that characterize and quantify physical properties, burning rates, peak temperatures, and calorific values of typical firewood species and resulting charcoal fuels produced by slow pyrolysis. This study evaluated the mechanical and thermal properties of firewood and charcoal from five tree species namely: Dichrostachys cinerea, Morus Lactea, Piliostigma thonningii, Combretum molle, and Albizia grandibracteata. Characterization was done by scanning electron microscopy, thermogravimetric analysis, bomb calorimetry, Fourier transform infrared spectroscopy, bulk density measurements, and durability, water boiling and absorption tests. SEM images showed the development of macropores on charcoal after slow pyrolysis. Peak temperatures during firewood and charcoal combustion ranged between 515.5–621.8 °C and 741.6–785.9 °C, respectively. Maximum flame temperatures ranged between 786.9–870.8 °C for firewood and 634.4–737.3 °C for charcoal. Bulk densities and calorific values of charcoal species were higher than those for firewood species. Drop strengths for firewood were all 100% while for charcoal were between 93.7 and 100%. Water boiling tests indicated that firewood fuel performed better that charcoal fuel for low amounts of water due to higher maximum flame temperatures obtained during combustion of firewood.

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“…Briseño-Uribe et al, 2016 obtained lower ash contents for charcoal (2.0-8.2%) [35]. Júnior et al, 2020 reported lower ash contents (6.6%) for charcoal [34].…”

Section: Physical Propertiesmentioning

confidence: 98%

Section: Surface Morphologymentioning

confidence: 99%

Thermal and mechanical characteristics of local firewood species and resulting charcoal produced by slow pyrolysis

Lubwama

Yiga

Ssempijja

et al. 2021

Biomass Conv. Bioref.

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“…Increasing the temperature releases volatile materials, which combust in a gaseous form, resulting in rapid ignition and combustion, but they are unable to provide energy for longer periods [27]. It is also desirable to have low ash content, since it does not contribute to combustion and can impede equipment operation, hindering the wood-burning process [37].…”

Section: Wood Chemical Characterizationmentioning

confidence: 99%

“…The combustion index (C) expresses the intensity of wood combustion and is positively related to its performance during burning [37,38]. On the other hand, I i expresses the ease with which the fuel ignites, so lignocellulosic biomass with a higher value ignites more easily [26].…”

Section: Wood Combustibilitymentioning

confidence: 99%

Impact of Chemical Composition on Eucalyptus Wood Clones for Sustainable Energy Production

Vieira,

Trugilho,

Carabineiro

et al. 2023

Forests

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The energy potential of wood biomass is significantly shaped by its chemical composition. Analyzing the chemical composition of wood biomass and understanding the correlations between these parameters and wood combustibility are essential stages in the selection process of Eucalyptus clones tailored for firewood production and energy generation. In this study, we aimed to evaluate the impact of chemical composition on the direct combustibility of Eucalyptus clones. We examined the structural chemical composition and conducted proximate analysis, including fixed carbon, volatile material, and ash, to investigate the relationship between proximate composition and wood combustibility parameters. Our findings revealed significant correlations between wood chemical composition and combustibility parameters. In particular, lignin content, ethanol-soluble extractives, and xylose demonstrated inverse relationships with the parameters of maximum combustion rate, combustion characteristic index, and ignition index. Conversely, holocellulose content, cold-water-soluble extractives, and glucose exhibited direct correlations with the same combustibility parameters. Furthermore, fixed carbon and volatile matter contents demonstrated direct and inverse correlations, respectively, with ignition temperature. These findings have significant implications for enhancing the efficiency and sustainability of biomass energy production.

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“…Durante a produção do carvão vegetal, é gerado uma grande de finos de carvão que são considerados resíduos devido a sua baixa granulometria e elevada friabilidade. Como a geração de finos pode chegar a cerca de 25% do total produzido, podemos estimar que somente no ano de 2018, cerca de 1,4 milhão de toneladas de finos foram geradas (Awan et al, 2020;Dias Júnior et al, 2021). Diante do elevado volume gerado é importante desenvolver formas de aproveitamento ecologicamente responsável destes resíduos.…”

Section: Introductionunclassified

Potencial energético dos resíduos do processamento de café combinados com finos de carvão vegetal

Resende

Araújo

Lorenço

et al. 2021

RSD

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O objetivo do presente trabalho foi avaliar a composição e a qualidade dos resíduos do processamento de café e suas misturas com finos do carvão vegetal para fins energéticos. A biomassa do café, os finos de carvão vegetal e as misturas (10, 20 e 30% de finos de carvão vegetal) foram caracterizados quanto à umidade, composição química imediata e elementar, poder calorífico superior e líquido, e densidade a granel e energética. A inclusão de finos de carvão vegetal promoveu a redução significativa da umidade da biomassa lignocelulósica de café, assim como, o aumento das propriedades energéticas. O tratamento com 30% de finos de carvão vegetal apresentou a melhor qualidade, atingindo um poder calorífico superior de 19,44 MJ.Kg-1 e poder calorífico líquido de 16,75 MJ.Kg-1, ou seja, um aumento energético de 6 e 10 %, respectivamente, em relação ao tratamento com 100% de biomassa residual de café. As características físico-químicas tanto dos resíduos gerados durante o processamento do café quanto dos finos de carvão apresentam boas propriedades energéticas, que as transformam em um excelente material para utilização no desenvolvimento de biocombustíveis. Portanto, recomenda-se a mistura de pelo menos 20% de finos de carvão vegetal para potencializar o desempenho energético de resíduos oriundos da produção de café.

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Blends of charcoal fines and wood improve the combustibility and quality of the solid biofuels

Cited by 16 publications

References 43 publications

Thermal and mechanical characteristics of local firewood species and resulting charcoal produced by slow pyrolysis

Thermal and mechanical characteristics of local firewood species and resulting charcoal produced by slow pyrolysis

Impact of Chemical Composition on Eucalyptus Wood Clones for Sustainable Energy Production

Potencial energético dos resíduos do processamento de café combinados com finos de carvão vegetal

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