Torrefaction of biomass in a quiescent mineral layer: Influence of mineral filler type

Leontiev, A. I.; Kichatov, Boris; Korshunov, Alexey; Melnikova, Ksenia; Yakovenko, I. S.; Gubernov, Vladimir

doi:10.1016/j.fuel.2019.115740

Cited by 11 publications

(9 citation statements)

References 45 publications

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“…The inner space of the furnace was connected with an environment via the pipe. A more detailed description of the experimental scheme is presented in the paper . The heating up to the given temperature took 20 min, while the torrefaction duration was varied in the range from 40 to 70 min.…”

Section: Methodsmentioning

confidence: 99%

“…Wood chips, briquettes, or pellets are placed inside the reactor, under a quiescent layer of the mineral filler (Figure ). Microparticles of bentonite, talc, calcite, or their blends can be utilized as mineral fillers . Results of the paper show that the final properties of the biofuel can vary significantly depending on the type of the utilized mineral filler.…”

Section: Introductionmentioning

confidence: 99%

“…Microparticles of bentonite, talc, calcite, or their blends can be utilized as mineral fillers . Results of the paper show that the final properties of the biofuel can vary significantly depending on the type of the utilized mineral filler. The reactor is heated through the outer shell and/or via the system of pipes set up inside the reactor.…”

Section: Introductionmentioning

confidence: 99%

“…From the practical point of view, it is important to answer the question of how the wood species affects the properties of the biofuel. In contrast to, , where the torrefaction of briquettes produced of birch shavings and pine pellets were studied, here the properties of the biofuel prepared via torrefaction of chips of pine, spruce, trembling aspen, maple, willow, white birch, acacia, and apple tree are compared. Results obtained here allow answering the question if it is efficient to carry out simultaneous torrefaction of different wood species?…”

Section: Introductionmentioning

confidence: 99%

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Torrefaction of Wood in a Quiescent Layer of Talc

et al. 2020

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Biomass torrefaction can be carried out in the unsealed reactor filled with a quiescent layer of mineral filler. Mineral filler limits the oxygen access toward the biomass from the environment and favors more uniform temperature distribution inside the reactor. This paper is devoted to the experimental analysis of the torrefaction of softwoods (pine and spruce) and hardwoods (trembling aspen, maple, willow, white birch, acacia, and apple tree) in a quiescent layer of talc. It is established that pine and spruce provide the maximum mass yield independent on the regime of torrefaction. The difference in the mass yield for different wood species can be 20% if other conditions are equal. At low temperatures, torrefaction proceeds in a kinetic regime, in which the rate of chemical reactions limits the macroscopic rate of hemicellulose decomposition. At elevated temperatures of torrefaction, a diffusive regime is realized. In this regime, the mass yield mainly depends on the intensity of oxygen and water vapor diffusion through the mineral layer. We propose a simple phenomenological model to substantiate the dependence of mass yield on the height of the mineral layer. Biomass combustion characteristics are studied on the base of thermogravimetry−differential scanning calorimetry analysis. It is shown that the intensity of the biofuel combustion on the initial stage decreases with the increase in torrefaction temperature. Hydrophobicity of the biofuel is assessed via measuring the contact angle. When all the torrefaction conditions are the same, pine appears to be more hydrophobic compared to birch.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Torrefaction of Wood in a Quiescent Layer of Talc

et al. 2020

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“…According to technology, kaolin layer was used to limit oxygen access to the sunflower husk samples from the environment [35]. The increase of kaolin layer height had the opposite effect due to a decrease in the access of oxygen to the biomass [37]. Untreated sunflower husk contained 77.6% volatiles and 12.5% fixed carbon.…”

Section: Fuel Properties Of Biomassmentioning

confidence: 99%

Oxidative Torrefaction of Sunflower Husk Pellets in the Kaolin Layer

Islamova

Ermolaev

Bulygina

2021

Preprint

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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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