This work deals with the
determination of the temperature profile within a direct heatingmoving bed torrefierin
order to determine its minimum column height. A thermal model based on eulerian-euleriantwo-phase solid-gas theory was performed and solved with the
method of lines. In addition, this study
allows to investigate the effect of the
biomass particle size on the minimum torrefier column height. This investigation was performed by changing, simultaneously, the diameter of particles and
the minimum fluidization velocity of the bed. Then, the calculations were made
for a counter-current torrefaction reactor of 30cm in diameter and for 5kg/h of the feed rate of raw
sugarcane bagasse. Results show that the height
of the reactor column must be at least 30 cm for that are 1 mm in diameter and
108 cm for particles that are 2 mm in diameter.
References
[1]
Tumuluru, J.S., Sokhansanj, S. and Baardman, R.D. (2011) A Review on Biomass Torrefaction Process and Product Properties for Energy Applications. Industrial Biotechnology, 7, 384-491. https://doi.org/10.1089/ind.2011.7.384
[2]
Rousset, P., Davreux, F., Macedo, L. and Perré, P. (2011) Characterization of the Torrefaction of Beech Wood Using NIRS: Combined Effects of Temperature and Duration. Biomass and Bioenergy, 35, 1219-1226. https://doi.org/10.1016/j.biombioe.2010.12.012
[3]
Sadiku, M.N.O. and Obiozor, C.N. (2000) A Simple Introduction to the Method of Lines. International Journal of Electrical Engineering Education, 37, 282-296. https://doi.org/10.7227/IJEEE.37.3.8
[4]
Basu, P. (2013) Biomass Gasification, Pyrolysis, and Torrefaction: Pratical Design and Theory. Elsevier Inc., USA. https://doi.org/10.1016/B978-0-12-396488-5.00007-1
[5]
Samir, H., William, E.S. and Graham, W.G. (2009) Method of Lines. Scholarpedia, 2, 2859. https://doi.org/10.4249/scholarpedia.2859
[6]
Hugo, T.J. (2010) Pyrolysis of Sugarcane Bagasse. Master of Sciences in Engineering.
[7]
Yaws, C.L. (1995) Thermophysical Properties of Chemicals and Hydrocarbons. 830-838.
[8]
Ranz, W.E. (1952) Friction and Transfer Coefficients for Single Particles and Packed Beds. Chemical Engineering Progress, 48, 247-253.
[9]
Esence, T., Bruch, A., Molina, S., Stutz, B. and Fourmigué, J.F. (2017) A Review on Experience Feedback and Numerical Modeling of Packed-Bed Thermal Energy Storage Systems. Solar Energy, 153, 628-654. https://doi.org/10.1016/j.solener.2017.03.032
[10]
Hairer, E. and Wanner, G. (1991) Solving Ordinary Differential Equations II, Stiff and Differential-Algebraic Problems. Springer-Verlag, Berlin, 5-8. https://doi.org/10.1007/978-3-662-09947-6
[11]
Mikhail, M.N. (1987) On the Validity and Stability of the Method of Lines for the Solution of Partial Differential Equations. Applied Mathematics and Computation, 22, 89-98. https://doi.org/10.1016/0096-3003(87)90038-5
[12]
Pamuk, S. and Erdem, A. (2007) The Method of Lines for the Numerical Solution of a Mathematical Model for Capillary Formation: The Role of Endothelial Cells in the Capillary. Applied Mathematics and Computation, 186, 831-835. https://doi.org/10.1016/j.amc.2006.08.024