Thermal decomposition of torrefied and carbonized briquettes of residues from coffee grain processing

Protásio, Thiago de Paula; Melo, Isabel Cristina Nogueira Alves de; Guimarães, Mário; Mendes, Rafael Farinassi; Trugilho, Paulo Fernando

doi:10.1590/s1413-70542013000300004

Cited by 14 publications

(21 citation statements)

References 31 publications

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“…It was observed that ARTOK has a lower mass loss rate than AROK due to a higher resistance to thermal degradation. Fuels with higher contents of FC and low volatile matter tend to decompose slowly and offer higher resistance to thermal degradation [65]. This is in agreement with Ren et al [66] who noticed that the raw biomass lost mass faster than torrefied biomass during the pyrolysis of woody biomass.…”

Section: Kinetic Parameterssupporting

confidence: 86%

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

Al-Farraji

Marsh

Steer

et al. 2017

Waste Biomass Valor

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This paper is an experimental study of the kinetics of gasification of olive kernel by using a thermogravimetric fluidized bed reactor technique. Gasification of 'as received' and torrefied olive kernels were investigated in a lab-scale bubbling fluidized bed gasifier, operating at up to 3.2 kg/h. The effect of bed temperature between 550 and 750 °C in 50 °C increments on the gasification product gas at mass-based equivalence ratios of 0.15 and 0.2 was studied. To explore the potential of torrefied biomass, the gasification results were compared to that of the 'as received' biomass. The product gas from torrefied biomass produced higher H 2 , CO and CH 4 concentrations at identical oxidant flow rates in addition to higher cold gas efficiency and higher product gas heating value. The influence of equivalence ratio in gasification was also investigated at reactor temperatures of 750 °C and five equivalence ratios (0.15, 0.2, 0.25, 0.3, and 0.35). The results revealed that the torrefied biomass has the highest HHV at an equivalence ratio of 0.2 with a value of 6.09 MJ/Nm 3 , while 'as received' biomass 4.72 MJ/Nm 3 . Kinetic experiments under isothermal conditions were performed for the gasification of the materials in continuous mode. A mass balance model was successfully used to provide the capability of separately determining the rate constant of the reactions taking place. The kinetic parameters were calculated by a first order reaction model giving activation energies for 'as received' olive kernels of 84 kJ/mol and for torrefied olive kernels of 106 kJ/mol.

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Section: Kinetic Parameterssupporting

confidence: 86%

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

Al-Farraji

Marsh

Steer

et al. 2017

Waste Biomass Valor

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“…The procedure used in the laboratory for carbonization is similar to that found in the literature for wood (ASSIS et al, 2012;PROTÁSIO et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

“…Thus, the solid fraction resulting from combustion of this macromolecule is approximately 9% higher than the other structural components of plant biomass (KAI et al, 2011). Furthermore, the fixed carbon is the fraction of the fuel that burns in the solid state and, thus, provides major thermal stability and less weight loss of the biomass during of the combustion (PROTÁSIO et al, 2013).…”

Section: Fresh Biomassmentioning

confidence: 99%

Combustion of Biomass and Charcoal Made From Babassu Nutshell

Protásio

Guimarães

Mirmehdi

et al. 2017

CERNE

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ABSTRACT:In recent years, studies have examined the use of lignocellulosic wastes for energy generation. However, there is a lack of information on the combustibility of the residual biomass, especially the bark and charcoal of babassu nut. In this study, thermogravimetric analysis (TGA), differential thermal analysis (DTA) and differential scanning calorimetry (DSC) were used to achieve the following objectives: to evaluate the combustion of the residual biomass from the babassu nut; to evaluate the combustion of charcoal produced from this biomass, considering different final carbonization temperatures; and to determine the effect of the final carbonization temperature on the thermal stability of charcoal and on its performance in combustion. Thermal analyses were performed in synthetic air. In order to evaluate the characteristics of charcoal combustion and fresh biomass, the ignition temperature (T i ), the burnout temperature (T f ), characteristic combustion index (S), ignition index (D i ), time corresponding to the maximum combustion rate (t p ), and ignition time (t ig ) were considered. The combustion of the babassu nutshell occurred in three phases and it was observed that this lignocellulosic material is suitable for the direct generation of heat. The increase in the final carbonization temperature caused an increase in the ignition temperature, as well as in the burnout temperature, the ignition time and the time corresponding to the maximum combustion rate. The results indicate that the increase in the carbonization temperature causes a decrease in combustion reactivity and, consequently, the charcoals produced at lower temperatures are easier to ignite and exhibit better performance in ignition.COMBUSTÃO DA BIOMASSA E DO CARVÃO VEGETAL DA CASCA DO COCO BABAÇU RESUMO: Nos últimos anos, pesquisadores têm analisado o uso de resíduos lignocelulósicos para geração de energia. No entanto, há uma falta de informação sobre a combustibilidade da biomassa residual, especialmente a casca e o carvão vegetal do coco babaçu. Neste estudo foram utilizadas as análises termogravimétricas (TGA), térmica diferencial (DTA) e de calorimetria exploratória diferencial (DSC) para: avaliar a combustão da biomassa residual do coco babaçu; avaliar a combustão do carvão vegetal produzido a partir dessa biomassa, considerando diferentes temperaturas finais de carbonização; e verificar o efeito da temperatura final de carbonização na estabilidade térmica do carvão vegetal e no seu desempenho na combustão. As análises térmicas foram realizadas em atmosfera de ar sintético. Para avaliar as características da combustão do carvão vegetal e da biomassa in natura foi considerada a temperatura de ignição (Ti), a temperatura final da combustão (Tf), o índice característico da combustão (S), o índice de ignição (Di), o tempo correspondente à máxima taxa de combustão (tp) e o tempo de ignição (tig). A combustão da casca do coco babaçu ocorreu em três fases distintas e observou-se que esse material lignocelulósico apresenta aptidão para ...

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“…The dried leaves were then carbonized by using a furnace to decompose the chemical content of materials such as cellulose, hemicellulose, and lignin. In general, the carbonization process was done at a temperature of 250 -450°C [7]. In this study, the carbonization process was carried out at a temperature of 260°C.…”

Section: Methodsmentioning

confidence: 99%

Preparation and characterization of leaf-based biobriquette with tapioca as adhesives

Nurhilal

Suryaningsih

Nusi

2018

J. Pow. Tech. Adv. Funct. Mater.

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Abstract:The fall leaves waste are abundantly and freely available from trees which are grown aims for reforestation and environmental sustainability purposes such as Samanea saman, Filicium decipiens, and mahogany trees. However, burning fallen leaves used to be standard practice across some local areas though most municipalities now ban or discourage the incendiary practice due to the air pollution causes bad impact to human health and the environment, and often results in dangerous wildfires. Also, ash particulates irritate the eyes and throat and restrict visibility. On the other hand, the powder of those dried leaves is potential raw materials for briquettes as an alternative source of energy provide proper carbonation process. This paper reports the preparation and characterization of briquettes from the powder of those dry leaves utilized tapioca as an adhesive. The proximate analysis showed that the lowest water content was 6.13% obtained from carbonization of Filicium decipiens briquettes, the lowest ash content was 4.66% for non-carbonization briquettes Samanea saman, the lowest volatile matter was 29.85% for carbonization briquette Samanea saman, the highest fixed carbon was 49.32% for briquette carbonization Samanea saman. The highest calorific value was 5,236 cal/g received from carbonized Filicium decipiens briquettes. It was concluded that the use of tapioca as adhesive could improve the calorific value of as prepared briquettes.

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Thermal decomposition of torrefied and carbonized briquettes of residues from coffee grain processing

Cited by 14 publications

References 31 publications

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

Combustion of Biomass and Charcoal Made From Babassu Nutshell

Preparation and characterization of leaf-based biobriquette with tapioca as adhesives

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