Combustion details of raw and torrefied biomass fuel particles with individually-observed size, shape and mass

Panahi, Aidin; Vorobiev, Nikita; Schiemann, Martin; Tarakcioglu, Mahmut; Delichatsios, Michael; Levendis, Yiannis A.

doi:10.1016/j.combustflame.2019.06.009

Cited by 49 publications

(27 citation statements)

References 108 publications

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“…Similar results have been reported from the gasification of torrefied tomato peels [28], and oil palm biomass [29]. In addition, torrefaction treatment can change biomass properties to provide a better fuel quality for combustion [30][31][32]. The kinetics of biomass torrefaction is fundamental for the prediction of thermal decomposition kinetic characteristics under different torrefaction conditions and is helpful for the design and scale-up of torrefaction systems and the optimization of torrefaction processes [33,34].…”

Section: Introductionsupporting

confidence: 64%

Poplar wood torrefaction: Kinetics, thermochemistry and implications

Chai

Xie

et al. 2021

Renewable and Sustainable Energy Reviews

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Section: Introductionsupporting

confidence: 64%

Poplar wood torrefaction: Kinetics, thermochemistry and implications

Chai

Xie

et al. 2021

Renewable and Sustainable Energy Reviews

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“…This figure shows the measured blackbody reference data.The observed nutshell particles have a diameter of 200-450 µm. As observed by Panahi et al[14] biomass chars generated under high heating rates are typically cenospheric with a very thin carbon shell. This is why an average diameter of 325 µm is assumed for all measurements of nutshell particles and no significant shrinkage is assumed as the cenospheric shell structure fixes all carbon at a layer…”

mentioning

confidence: 76%

Investigation of Pulverized Biomass and Coal Char Emissivity

Pörtner

Schiemann

2020

Energies

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Current work presents an optical setup, its calibration and reference process and the first results from single particle emissivity measurements of pulverized biomass and coal fuel particles. In contrast to earlier attempts, the setup offers the possibility of emissivity measurements during the whole particle burn-off. A laser ignites a single particle, placed in the center of the setup. Two photomultipliers observe the emitted particle radiation in the visible range (550 nm and 700 nm) for temperature calculation, using two-color pyrometry. An InSb-detector records the emitted particle radiation between 2.4 µm and 5.5 µm, which is later used to calculate particle emissivity in this range. The conclusion of multiple particle measurements lead to decreasing particle emissivity with increasing temperature. For coal particles the emissivity decreases from 0.45 at 2300 K to 0.03 at 3400 K. Biomass char shows a similar trend with a decrease from 0.18 (2100 K) to 0.03 (2900 K).

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“…Torrefaction is usually performed in an inert atmosphere at a temperature between 200 and 300 C, with the torrefaction time ranging from minutes to hours [13,14]. Hemicellulose and extractives are easily degraded during torrefaction process [15].…”

Section: Introductionmentioning

confidence: 99%

Fast torrefaction of large biomass particles by superheated steam: Enhanced solid products for multipurpose production

Niu

Ronsse

et al. 2022

Renewable Energy

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Conventional torrefaction technology upgrade biomass for improved storage or as pretreatment prior to combustion or pyrolysis, and are generally performed on small-scale particles. Superheated steam (SHS) as the carrier gas and sole heat source was proposed to heat biomass rapidly and evenly while generating intensively torrefied biomass. This work revealed the potential of SHS torrefaction to upgrade large wood particles (F ¼ 30 mm, H ¼ 60 mm), to improve the feedstock suitability and expand products diversity in torrefaction technology. The effects of SHS torrefaction at different depths in large particles were investigated. A torrefaction time of 30 min was deemed capable of upgrading even the inner sections of large particle to have appropriate fuel properties. The HHV of the torrefied biomass enhanced by 50% reaching 28.76 MJ kg À1 . Combustion and pyrolysis behaviour of torrefied biomass demonstrated their properties as benign fuel and pyrolysis feedstock, respectively. Moisture absorption (from 13.52 to 3.42 wt%) and grindability results (386.96e10.52 kWh ton À1 ) indicated that large particles from SHS torrefaction were easy for handling, transportation, and storage. The investigation of physicochemical properties at different depths of the torrefied biomass helped to understand SHS torrefaction behaviour in large biomass particles, hence, to control the reaction extent in the desired end product.

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Combustion details of raw and torrefied biomass fuel particles with individually-observed size, shape and mass

Cited by 49 publications

References 108 publications

Poplar wood torrefaction: Kinetics, thermochemistry and implications

Poplar wood torrefaction: Kinetics, thermochemistry and implications

Investigation of Pulverized Biomass and Coal Char Emissivity

Fast torrefaction of large biomass particles by superheated steam: Enhanced solid products for multipurpose production

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