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Energies 2015, 8(5), 3903-3923;

Experimental Study on Dry Torrefaction of Beech Wood and Miscanthus

Department Energy Technology, University of Twente, 7500 AE Enschede, The Netherlands
Centre for Coal Technology, University of the Punjab, Lahore 54700, Pakistan
University of Engineering & Technology, Taxila 47080, Pakistan
Author to whom correspondence should be addressed.
Academic Editor: Enrico Sciubba
Received: 4 March 2015 / Revised: 17 April 2015 / Accepted: 20 April 2015 / Published: 6 May 2015
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Torrefaction is a thermochemical pre-treatment process for upgrading the properties of biomass to resemble those of fossil fuels such as coal. Biomass properties of particular interest are chemical composition, physical property and combustion characteristics. In this work, torrefaction of beech wood and miscanthus (sinensis) was carried out to study the influence of torrefaction temperature (240–300 °C) and residence time (15–150 min) on the aforementioned properties of the biomass. Results of the study revealed that torrefaction temperature has a significant influence on mass and energy yields, whereas the influence of the residence time becomes more apparent for the higher torrefaction temperatures (>280 °C). Torrefied miscanthus resulted in higher energy densification compared to beech wood for a residence time of 30 min. A significant improvement in grindability of the torrefied beech wood was obtained even for lightly torrefied beech wood (at 280 °C and 15 min of residence time). Observation from the combustion study showed that the ignition temperature is slightly affected by the torrefaction temperature. As a whole, the torrefaction temperature determines the characteristics of the torrefied fuel compared to other process parameters like residence time. Furthermore, with optimal process conditions, torrefaction produces a solid fuel with combustion reactivity and porosity comparable to raw biomass, whereas grindability and heating value are comparable to low quality coal. View Full-Text
Keywords: torrefaction; beech wood; miscanthus; higher heating value; SEM images; ignition temperature; grindability torrefaction; beech wood; miscanthus; higher heating value; SEM images; ignition temperature; grindability

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Gucho, E.M.; Shahzad, K.; Bramer, E.A.; Akhtar, N.A.; Brem, G. Experimental Study on Dry Torrefaction of Beech Wood and Miscanthus. Energies 2015, 8, 3903-3923.

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