NDLI: Thermochemical and Fluid Dynamic Model of a Bench-Scale Torrefaction Reactor

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Waste and Biomass Valorization : Volume 5, Issue 1, February 2014

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Thermochemical and Fluid Dynamic Model of a Bench-Scale Torrefaction Reactor

Content Provider	Springer Nature Link
Author	Patuzzi, Francesco Gasparella, Andrea Baratieri, Marco
Copyright Year	2013
Abstract	In biomass-to-energy systems, torrefaction represent an interesting pre-treatment, as it increases the feedstock energy content and its suitability for the subsequent thermal conversion process. The aim of this work is to develop and validate a numerical model for the torrefaction of common reed (Phragmites australis). In order to predict the rate of the biomass decomposition (i.e., yield of the reaction products) and characterise the thermofluidynamics of the reactor, a heat, mass and momentum transfer model based on a finite volumes method (f.v.m.) representation has been developed and supplemented with a torrefaction kinetic model, consisting of a two-step scheme previously proposed. The kinetic model has been calibrated utilizing the results of thermogravimetric analysis applied to common reeds. Experimental tests have been also performed on reeds in a bench-scale batch apparatus, varying the main process parameters. The validation of the proposed kinetic scheme has been carried out following two different approaches. Through the first (simplified) approach, the finite elements model has been used to estimate the temperature distribution inside the reactor during the experimental tests. An average (experimental) torrefaction temperature has been then calculated and used as input of the kinetic model. In the second approach, the proposed kinetic scheme has been implemented directly in the f.v.m. model, solving numerically the mass and energy conservation equation. The results obtained by means of the two modelling approaches have been then compared with the experimental data. The proposed thermochemical and fluid dynamic model seems to be a suitable tool for the simulation of a torrefaction reactor and useful for the characterisation and optimization of such kind of systems.
Starting Page	165
Ending Page	173
Page Count	9
File Format	PDF
ISSN	18772641
Journal	Waste and Biomass Valorization
Volume Number	5
Issue Number	2
e-ISSN	1877265X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-04-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermofluidynamic Numerical modelling Torrefaction Common reed Engineering Environment Renewable and Green Energy Industrial Pollution Prevention Waste Management/Waste Technology Environmental Engineering/Biotechnology
Content Type	Text
Resource Type	Article
Subject	Waste Management and Disposal Environmental Engineering Renewable Energy, Sustainability and the Environment

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