Cornelius Agu
Department of Process, Energy and Environmental Technology, Telemark University College, Norway
Rajan Thapa
Department of Process, Energy and Environmental Technology, Telemark University College, Norway
Britt Halvorsen
Department of Process, Energy and Environmental Technology, Telemark University College, Norway
Download article
http://dx.doi.org/10.3384/ecp1511981Published in: Proceedings of the 56th Conference on Simulation and Modelling (SIMS 56), October, 7-9, 2015, Linköping University, Sweden
Linköping Electronic Conference Proceedings 119:8, p. 81-89
Published: 2015-11-25
ISBN: 978-91-7685-900-1
ISSN: 1650-3686 (print), 1650-3740 (online)
Due to complexity in interactions between solid particles and between particles and carrier fluid, modeling of biomass gasification kinetics has been shown to be very challenging. Some commercial packages such as Barracuda VR describe the process using a complicated Eulerian-Lagrangian approach of modeling gas - solid multiphase flow. Since chemical reactions play the major role in the gasification process, this paper focuses on a simplified model that describes the influence of reaction kinetics on the process in a bubbling fluidized bed reactor with circulating bed material. The developed model assumes that the system is ideally mixed with a constant bed temperature. Two different set of reaction rate constants are applied to test the model, and their results are compared with that from Barracuda. The model is used to study the effect of steam-biomass ratio on char conversion, and the results show that the conversion of char increases with steam-to-biomass ratio. Sensitivity analysis shows that the output of the model strongly depends on temperature and slightly depends on the bed material particles size.
A. Farooq, M. Ghauri, M. H. Jaffery, and K. Shahzad (2013): Modeling of Biomass Gasification with CO2 as Gasifying Agent. Journal of Sci. Int. (Lahore), 25(3): 497-500, 2013.
A.A. Amsden, P.J. O’Rourke, and T.D. Butler (1989): A Computer Program for Chemically Reactive Flows with Sprays. Los Alamos National Laboratory, 1989.
D. Fiaschi, and M. Michelini (2001): A Two-Phase One-Dimensional Biomass Gasification Kinetics Model. Journal of Biomass and Bioenergy, 21: 121-132, 2001.
D. Snider, and S. Banerjee (2010): Heterogeneous Gas Chemistry in the CPFD Eulerian–Lagrangian numerical scheme (ozone decomposition). Journal of Powder, 199(1): 100-106, 2010.
D.S. Boyalakuntla (2003): Simulation of Granular and Gas-Solid Flows Using Discrete Element. Department of Mechanical Engineering, Carnegie Mellon University,
pp.74, 2003.
F. Fantozzi, S. Colatoni, P. Bartocci, and U. Desider (2007): Rotary Kiln Slow Pyrolysis for Syngas and Char Production from Biomass and Waste - Part II: Introducing Product Yields in the Energy Balance. Journal of Engineering for Gas Turbines and Power, 129: 908-913, 2007. doi: 10.1115/1.2720539.
F. Herning, and L. Zipperer (1936): Calculation of the Viscosity of Technical Gas Mixtures from Viscosity of the Individual Gases. Gas-Und Wasserfach, 79: 69-73, 1936.
J. Xie, W. Zhong, B. Jin, Y. Shao, and H. Liu (2012). Simulation on Gasification of Forestry Residues in Fluidized Beds by Eulerian-Lagrangian Approach. Journal of Bioresource Technology, 121: 36-46, 2012. doi: 10.1016/j.biotech.2012.06.080.
P. L?, X. Kong, C. Wu, Z. Yuan, L. Ma, and J. Chang (2008): Modeling and Simulation of Biomass Air-Steam Gasification in a Fluidized Bed. Journal of Chem. Eng. China, 2(2): 209-213, 2008. doi: 10.1007/s11705-008-0039-7
Q. Xu, S. Pang, and T. Levi (2011): Reaction Kinetics and Producer Gas Compositions of Steam Gasification of Coal and Biomass Blend Char, Part 2: Mathematical Modelling and Model Validation. Journal of Chemical Engineering Science, 66: 2232-2240, 2011. doi: 10.1016/j.ces.2011.02.054.
R. Radmanesh, J. Chaouki, and C. Guy (2006): Biomass Gasification in a Bubbling Fluidized Bed Reactor:
Experiments and Modeling. Journal of American Institute of Chemical Engineers, 52(12): 4258-4272, 2006. doi: 10.1002/aic.11020.
R.K. Thapa, C. Pfeifer, and B.M. Halvorsen (2014): Modeling of Reaction Kinetics in Bubbling Fluidized Bed Biomass Gasification Reactor. Internal Journal of Energy and Environment, 5(1): 35-44, 2014.
R.L. Braun, R.G. Mallon, and H.Y. Sohn (1981): Analysis of Multiple Gas-Solid Reactions during the Gasification of Char in Oil Shale Blocks. InProc. 14th Oil Shale Symposium, Colorado School of Mines Press, Golden, Colo, pp. 289-300, 1981.
Y.Haseli, J.A.V Oijen, and L.P.H. de Goey (2011): A Detailed One-Dimensional Model of Combustion of a Woody Biomass Particle. Journal of Bioresource Technology, 102, 9772-9782, 2011. doi: 10.1016/j.biotech.2011.07.075.
