Study of reactivity reduction in sugarcane bagasse as consequence of a torrefaction process

Granados, D.A.; Ruiz, Ricardo; Vega, L.Y.; Chejne, Farid

doi:10.1016/j.energy.2017.08.013

Cited by 72 publications

(20 citation statements)

References 63 publications

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“…The percent elemental carbon gain for torrefied bagasse was 16.35% and 28.90% when the torrefaction was performed at 250°C and 275°C respectively, over an extended duration of 90 min. These findings are consistent with the study performed by Granados et al (2017). They reported an increased release of volatile compounds with high oxygen and hydrogen content, which subsequently resulted in a decrease of elemental oxygen and hydrogen and an increase of carbon in the substrate.…”

Section: Resultssupporting

confidence: 93%

“…The decrease in H/C and O/C with the simultaneous increase in HHV is attributed to the dehydration and decarbonization of raw biomass during torrefaction (Anukam et al, 2015). As a result, torrefied biomass (char) with greater charring and aromaticity is formed, which reflects greater energy densification, as observed in this study and some previous works (Granados et al, 2017; Joshi et al, 2015a; Valix et al, 2017). From the values provided in Table 2, it is observed that an increase in torrefaction severity resulted in an overall increase in HHV due to cleavage of C-O bond with simultaneous accumulation of C-C and C-H bond having higher energy values (Bai et al, 2018).…”

Section: Resultssupporting

confidence: 80%

“…From existing literature, it is found that the complete removal of sulfur was hardly reported. For instance, Granados et al (2017) reported an increase in percent sulfur content from 0.12% to 0.16% with an increase in torrefaction severity. In contrast, Anukam et al (2015) observed a 66% (from 0.03 to 0.01 wt%) reduction in sulfur content when torrefaction was performed over a temperature range of 200–300°C.…”

Section: Resultsmentioning

confidence: 99%

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Impacts of non-oxidative torrefaction conditions on the fuel properties of indigenous biomass (bagasse)

et al. 2020

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Biomass is considered as the largest renewable energy source in the world. However, some of its inherent properties such as hygroscopicity, lower energy content, low mass density and bio-degradation on storage hinder its extensive application in energy generation processes. Torrefaction, a thermochemical process carried out at 200–300°C in a non-oxidative environment, can address these inherent problems of the biomass. In this work, torrefaction of bagasse was performed in a bench-scale tubular reactor at 250°C and 275°C with residence times of 30, 60 and 90 mins. The effects of torrefaction conditions on the elemental composition, mass yield, energy yield, oxygen/carbon (O/C) and hydrogen/carbon (H/C) ratios, higher heating values and structural composition were investigated and compared with the commercially available ‘Thar 6’ and ‘Tunnel C’ coal. Based on the targeted mass and energy yields of 80% and 90% respectively, the optimal process conditions turned out to be 250°C and 30 mins. Torrefaction of the bagasse conducted at 275°C and 90 min raised the carbon content in bagasse to 58.14% and resulted in a high heating value of 23.84 MJ/kg. The structural and thermal analysis of the torrefied bagasse indicates that the moisture, non-structural carbohydrates and hemicellulose were reduced, which induced the hydrophobicity in the bagasse and enhanced its energy value. These findings showed that torrefaction can be a sustainable pre-treatment process to improve the fuel and structural properties of biomass as a feedstock for energy generation processes.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

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Impacts of non-oxidative torrefaction conditions on the fuel properties of indigenous biomass (bagasse)

et al. 2020

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“…The FC was increased from 30.23 to 49.12%. Similar proximate analysis was also observed by Poudel et al [8], Martín-Lara et al [9] and Granados et al [25]. The increment of FC was in line with the increase of C content in the ultimate analysis as the temperature and time increased.…”

Section: Proximate Analysissupporting

confidence: 88%

Torrefaction of Food Waste as a Potential Biomass Energy Source

et al. 2019

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Food waste (FW) represents a major component of municipal solid waste (MSW) in Malaysia which causes negative impact due to poor waste management. One of a promising strategy to reduce the FW is to convert the FW to energy sources through thermal pre-treatment process which known as torrefaction. The aim of this study is to investigate the improvement of chemical properties and energy potential of the torrefied FW. The torrefaction of FW was conducted using tubular reactor to evaluate the influence of temperature (220 to 260°C) and residence time (15 to 60 min) on the quality of torrefied FW. The quality of torrefied FW were evaluated using ultimate analysis, proximate analysis, mass yield, energy yield and higher heating value (HHV). From ultimate analysis, the carbon, C was increased, however the hydrogen, H and oxygen, O decreased across the torrefaction temperature and residence time. This lead to the increasing of HHV with the increasing of temperature and time. The HHV of the dried FW was improved from 19.15 to 23.9 MJ/kg after being torrefied at 260°C for 60 min. The HHV indicated that FW has the potential to be utilized as an energy source.

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“…The C-O stretching and O-H alteration of organic components are assigned in the peak ranges of 1000 -1500 cm -1 . Granados et al [23] also found the similar trend which the intensity of these peaks were reduced with increasing torrefaction temperature. Peak of 700 cm -1 indicated the aromatic groups.…”

Section: Functional Groupsupporting

confidence: 54%

Influence of Torrefaction on Gasification of Torrefied Palm Kernel Shell

Ahmad¹,

Ishak²,

Ismail³

et al. 2018

Adv. sci. technol. eng. syst. j.

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In this study, torrefaction pretreatment on palm kernel shell (PKS) was investigated using fixed bed reactor. The PKS was torrefied at the temperatures of 210, 230, 250, 270 and 290 °C. The characteristics between untreated and torrefied PKS were compared. The results showed that, the mass and energy yield lessened, while the calorific value augmented with the increasing torrefaction temperature. Furthermore, with the rise of temperature, the oxygen composition, O/C ratio, oxygenated compounds and volatile matter of torrefied PKS decreased, but, the carbon and fixed carbon content increased. The composition of carbon in torrefied PKS was toward coal where equivalent calorific values was achieved. The gasification of torrefied PKS enhanced the product yield which produced higher gas, lower tar and char yield than the gasification of untreated PKS. Gasification of torrefied PKS increased the gas yield by 16.9 % than the untreated PKS. The tar and char yield of torrefied PKS decreased by 19.4 % and 25.9 %, respectively than the untreated PKS. Therefore, the torrefied PKS, by which their physical and chemical properties have been improved through torrefaction pretreatment is more suitable to be used in gasification and co-gasification as their influences are significant than the untreated PKS.

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Study of reactivity reduction in sugarcane bagasse as consequence of a torrefaction process

Cited by 72 publications

References 63 publications

Impacts of non-oxidative torrefaction conditions on the fuel properties of indigenous biomass (bagasse)

Impacts of non-oxidative torrefaction conditions on the fuel properties of indigenous biomass (bagasse)

Torrefaction of Food Waste as a Potential Biomass Energy Source

Influence of Torrefaction on Gasification of Torrefied Palm Kernel Shell

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