Oxidative torrefaction of briquetted birch shavings in the bentonite

Leontiev, A. I.; Kichatov, Boris; Korshunov, Alexey; Киверин, А. Д.; Medvetskaya, Natalia; Melnikova, Ksenia

doi:10.1016/j.energy.2018.09.103

Cited by 24 publications

(7 citation statements)

References 37 publications

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“…It was found that torrefaction resulted in an increasing hydrophobicity and fixed carbon (FC) content but decreasing H/C and O/C atomic ratios. Leontiev et al investigated the oxidative torrefaction of briquetted birch shavings in a muffle furnace and found that the final properties of torrefied biomass can be changed in the wide range. Therefore, it is necessary to increase the duration and temperature of torrefaction to improve the higher heating value (HHV) of biomass.…”

Section: Introductionmentioning

confidence: 99%

Oxidative Torrefaction of Phragmites australis: Gas-Pressurized Effects and Correlation Analysis Based on Color Value

et al. 2020

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In this study, atmospheric (AP) and gas-pressurized (GP) torrefaction of Phragmites australis (PAS) were carried out in a rotary tube furnace and a gas-pressurized autoclave, respectively, aiming to investigate the effects of torrefaction pressure on the physicochemical properties and combustion characteristics of torrefied PAS. The organic components of liquid products were also analyzed. Compared with AP torrefied PAS, GP torrefied PAS had a higher weight loss, higher heating value (HHV), lignin content, lower ash content, and atomic O/C and H/C ratios. In addition, GP torrefied PAS had better hydrophobicity, representing a stronger storage capability in humid environments. The organic components of liquid products derived from AP torrefaction were mainly aldehydes, ketones, phenols, and furans, while those from GP torrefaction were mainly phenols, acids, ketones, and alcohols. GP torrefied PAS contained a higher combustion stability and better fuel properties than AP torrefied PAS. The color of GP torrefied PAS was significantly darker than that of AP torrefied PAS, and the weight loss, volatile matter (VM) content, and HHV of AP and GP torrefied PAS showed good correlations with the color parameters. This study innovatively carried out torrefaction in a pressurized atmosphere and used color parameters to establish a model to predict the quality of torrefied products; the results could be applied directly to guide the further development of wetland biomass upgrading and products quality controlling.

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Section: Introductionmentioning

confidence: 99%

Oxidative Torrefaction of Phragmites australis: Gas-Pressurized Effects and Correlation Analysis Based on Color Value

et al. 2020

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“…Mild devolatilization and degradation reactions will occur to produce a more hydrophobic, homogeneous, and energy dense solid fuel. Recently, oxygen has been also introduced into the torrefaction process to achieve autothermal operation. − Therefore, as a mild pyrolysis, oxidative torrefaction of biomass is also described here.…”

Section: Concept Of Autothermal Pyrolysis Of Biomassmentioning

confidence: 99%

Fundamental Advances in Biomass Autothermal/Oxidative Pyrolysis: A Review

Huang

Liu

et al. 2020

ACS Sustainable Chem. Eng.

147

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Pyrolysis is an important thermochemical route to decompose lignocellulose biomass into biogas, bio-oil, and biochar, which can be then converted into value-added biofuels, chemicals, and biomaterials. Conventionally, the pyrolysis reaction is carried out under inert atmosphere. The quality of biocrudes and biochars from the conventional pyrolysis could significantly vary, depending on the types of feedstocks and reaction conditions. After intensive studies on the conventional biomass pyrolysis for decades, the external heat supply for the endothermic pyrolytic reactions is still one of the most important roadblocks to inhibit the scale-up and commercialization of biomass pyrolysis technologies. Different from the pyrolysis under inert gas atmosphere, autothermal pyrolysis tends to depolymerize the biomass (polymers) with restricted supply of oxygen/air, also called oxidative pyrolysis. The presence of oxygen in the pyrolyzer will induce the exothermic char-oxygen and/or volatile-oxygen reactions, thus in situ providing the heat for the primary thermal degradation of biomass and the subsequent secondary reactions. Besides the change in product distributions, the key advantage of autothermal pyrolysis is its self-sustainability in terms of heat supply and requirement, facilitating the ease of further scaling up. This review will thus mainly focus on the sum of the recent advances in autothermal pyrolysis and also discuss some innovative pathways for improving/adjusting the product quality.

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“…The oxygen concentration can be controlled by increasing or decreasing its diffusion into the biomass through the layer of mineral matter [34][35][36]. According to this technology, oxygen diffuses from the environment through the mineral layer towards biomass and takes part in torrefaction process.…”

Section: Introductionmentioning

confidence: 99%

Oxidative Torrefaction of Sunflower Husk Pellets in the Kaolin Layer

2021

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In this paper oxidative torrefaction of sunflower husk pellets in the kaolin layer was firstly investigated. Besides, influence of kaolin without use of special additives on limitation of the oxygen flow from environment into the sunflower husk was analyzed. Torrefaction temperature, torrefaction time, and height of kaolin layer over the range of 240-280 °C, 30-60 min, and 3-5 cm, respectively were varied. Analysis showed that increase of temperature led to more significant influence of layer height on mass yield. Energy yield gradually decreased with increasing torrefaction temperature and torrefaction time, and height of kaolin layer had the opposite effect on the energy yield. With the increase of torrefaction intensity, drier fuel with higher hydrophobicity was formed. Torrefaction resulted to biomass destruction, although the fiber structure was retained.

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Oxidative torrefaction of briquetted birch shavings in the bentonite

Cited by 24 publications

References 37 publications

Oxidative Torrefaction of Phragmites australis: Gas-Pressurized Effects and Correlation Analysis Based on Color Value

Oxidative Torrefaction of Phragmites australis: Gas-Pressurized Effects and Correlation Analysis Based on Color Value

Fundamental Advances in Biomass Autothermal/Oxidative Pyrolysis: A Review

Oxidative Torrefaction of Sunflower Husk Pellets in the Kaolin Layer

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