Comparison of slow and fast pyrolysis for converting biomass into fuel

Arni, Saleh Al

doi:10.1016/j.renene.2017.04.060

Cited by 271 publications

(77 citation statements)

References 9 publications

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“…High content of ash favors the production of the solid and gas fractions [24]. The obtained composition has percentages similar to those reported by other authors, that is to say, higher cellulose content, followed by hemicellulose, lignin, and ash [25].…”

Section: Pyrolysis Of Sugarcane Bagassesupporting

confidence: 86%

Synthesis of CuO for Microwave-Assisted Pyrolysis of Biomass

et al. 2019

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In this study, CuO was synthesized as a microwave absorber in the pyrolysis of a biomass model (sugarcane bagasse). CuO was synthesized for 5 min of irradiation using the following techniques: microwave (MW), ultrasound (US), combined mode (MW-US), and conduction heating (CH) as a reference material. The use of these treatments promotes changes in the morphology, as MW and US generate leaves and monolithic faceted morphologies, respectively. Changes were also generated in some textural characteristics such as crystal size, surface area, and volume-pore size. They were produced as a consequence of changes in the conditions during the crystallization stage produced by the different irradiation types. The microwave-assisted pyrolysis was performed aiming for the maximum liquid fraction (bio-oil) in the products. The reaction time, the size of the biomass, and the CuO synthesis method were also analyzed. The following particle size (ps) intervals were studied: ps < 0.5 mm, 0.5 mm < ps < 1.7 mm, 1.7 mm < ps < 3.5 mm. The best conditions at 1160 Watts in the microwave were: 4 min of reaction, particle size lower than 0.5 mm, and CuO synthesized by US. The use of CuO in the pyrolysis almost triples the amount of the obtained liquid fraction, when compared with the pyrolysis without the use of a microwave absorbent. The CuO was reduced to Cu2O and Cu after the pyrolysis. In this work, a reduction in the reaction times from hours to minutes was achieved during the synthesis of CuO and the pyrolysis biomass. The liquid fraction (bio-oil) can be raw material to obtain value-added chemical products or biofuels.

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Section: Pyrolysis Of Sugarcane Bagassesupporting

confidence: 86%

Synthesis of CuO for Microwave-Assisted Pyrolysis of Biomass

et al. 2019

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“…Similar product distributions of biomass wastes through slow pyrolysis were presented by other studies [38][39][40][41][42]. Agar et al [38] converted wastewater sludge and organic fines from municipal wastewater treatment plants (similar volatiles and ash content as our biomass feedstock) in carbon-rich char through pyrolysis in a laboratory fixed-bed reactor at 600 • C and 700 • C. The product distribution of sewage sludge at 600 • C was gas fraction 19%, liquid 33%, and char 48%, while for solid organic fines, the product yields at the same temperature were gas 33%, liquid 14%, and char 53%.…”

Section: Influence Of Biomass Type On Pyrolysis Product Distributionsupporting

confidence: 84%

“…Increasing the heating rate promoted the gas yield, but decreased the oil yield. Al Arni [40] obtained a product distribution of 37.6% char, 26.1% liquid, and 25.1% gas from sugarcane bagasse (84 wt.% volatiles, 5.9 wt.% ash) by conventional pyrolysis at 480 • C, heating rates of 40-50 • C/min, and 1 h residence time.…”

Section: Influence Of Biomass Type On Pyrolysis Product Distributionmentioning

confidence: 99%

Evaluation of Press Mud, Vinasse Powder and Extraction Sludge with Ethanol in a Pyrolysis Process

et al. 2019

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The effluents of the sugar and bio-ethanol industry, mainly vinasse as well as lignocellulosic waste, are produced in high volumes. Therefore, their treatment and valorization would reduce the environmental impact and make this industry more productive and competitive. The purpose of this study was to determine the potential use of press mud (lignocellulosic waste), vinasse powder, and vinasse sludge from an extraction process with ethanol, as raw materials for conventional pyrolysis evaluating the physicochemical characteristics that affect this thermochemical process, such as calorific power, density, ash content, volatile material, moisture and nitrogen, sulfur, carbon and hydrogen content, thermogravimetric profile, and quantification of lignin cellulose and hemicellulose. The batch pyrolysis experiments showed that all three wastes could be converted successfully into more valuable products. The powder vinasse led to the formation of the lowest content of bio-char (42.7%), the highest production of volatiles (61.6 wt.%), and the lowest ash content (20.5 wt.%). Besides, it showed the high heating value of 15.63 MJ/kg. Meanwhile, the extraction sludge presented the highest liquid yield (32%) with the lowest gas formation (18.2 wt.%) and the lowest heating value of 8.57 MJ/kg. Thus, the sludge could be a good feedstock for production of bio-oil and bio-char.

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“…A variety of lignocellulosic biomass can be valorized through thermochemical conversion for this purpose, such as wood, forest residues, wheat straw and other agriculture residues [2]. Among different biomass pyrolysis possibilities, by fast pyrolysis dry biomass is converted at temperatures of typically around 500 °C, short residence time in an inert atmosphere and ambient pressure, to result a brown viscous liquid, fast pyrolysis bio-oil (FPBO), as the main product along with some char and non-condensable gas [3,4].…”

Section: Introductionmentioning

confidence: 99%

Hydrotreatment of Fast Pyrolysis Bio-oil Fractions Over Nickel-Based Catalyst

et al. 2018

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Residual biomass shows potential to be used as a feedstock for fast pyrolysis bio-oil production for energetic and chemical use. Although environmentally advantageous, further catalytic upgrading is required in order to increase the bio-oil stability, by reducing reactive compounds, functional oxygen-containing groups and water content. However, bio-oils may separate in fractions either spontaneously after ageing or by fractionated condensation. Therefore the effects of upgrading on different fast pyrolysis bio-oil (FPBO) fractions obtained from a commercially available FPBO were studied by elemental analysis, GC-MS and 1 H-NMR. Not only the FPBO was upgraded by catalytic hydrotreatment, but also the heavy phase fraction formed after intentional aging and phase separation. The reactions were conducted between 175 and 325 °C and 80-100 bar by using a nickel-chromium catalyst in batch experiments. The influence of the hydrotreatment conditions correlated with the composition of the upgraded products. Higher oxygen removal was obtained at higher temperatures, whereas higher pressures resulted in higher hydrogen consumption with no significant influence on deoxygenation. At 325 °C and 80 bar 42% of the oxygen content was removed from the FPBO. Compounds attributed to pyrolysis oil instability, such as ketones and furfural were completely converted while the number of alcohols detected in the upgraded products increased. Coke formation was observed after all reactions, especially for the reaction with the fraction rich in lignin derivatives, likely formed by polymerization of phenolic compounds mainly concentrated in this phase. Independently of the feedstock used, the upgraded bio-oils were very similar in composition, with reduced oxygen and water content, higher energy density and higher carbon content.

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Comparison of slow and fast pyrolysis for converting biomass into fuel

Cited by 271 publications

References 9 publications

Synthesis of CuO for Microwave-Assisted Pyrolysis of Biomass

Synthesis of CuO for Microwave-Assisted Pyrolysis of Biomass

Evaluation of Press Mud, Vinasse Powder and Extraction Sludge with Ethanol in a Pyrolysis Process

Hydrotreatment of Fast Pyrolysis Bio-oil Fractions Over Nickel-Based Catalyst

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