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CFD Analysis on Fluidized Bed Gasification of Rice Husk and Rice Straw

DOI: 10.4236/oalib.1103372, PP. 1-10

Subject Areas: Mechanical Engineering

Keywords: Computational Fluid Dynamics, Fluidized Bed, Eulerian Model, Superficial Velocity, Carbon Conversion

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Abstract

In the work being presented, computational fluid dynamics (CFD) analysis on fluidized bed gasification of rice husk has been carried out. The multiphase Eulerian model was undertaken in the analysis. Due to the lack of computational space, two dimensional models of fluidized bed were created. The objective of the investigation was to study the effect of variation on velocity with varying particle sizes. The quality of synthesis gas was also taken into account. The inlet’s superficial velocity was varied from 0.2 m/s to 1.2 m/s and diameter of rice husk varied from 0.0438 mm to 4.38 mm. Based on obtained results, this may be concluded that minimum fluidization velocity decreases with increase in diameter of rice husk. The carbon conversion was found to be maximum for 0.7 m/s velocity and carbon conversion increased for other velocities up to 96.9%. The analysis was carried out using ANSYS FLUENT 14.0 non-commercial code.

Cite this paper

Pushpendra, S. and Srivastava, A. K. (2017). CFD Analysis on Fluidized Bed Gasification of Rice Husk and Rice Straw. Open Access Library Journal, 4, e3372. doi: http://dx.doi.org/10.4236/oalib.1103372.

References

[1]  Kunii, D. and Levenspiel, O. (1968) Bubbling Bed Model for Kinetic Processes in Fluidized Beds. Industrial & Engineering Chemistry Process Design and Development, 7, 481-492. https://doi.org/10.1021/i260028a001
[2]  Singh, R.I. (2010) Study of Performance of an Atmospheric Bubbling Fluidized Bed Combustor Using Rice Waste. Thapar University, Patiala.
[3]  Mansaray, K.G., Al-Taweel, A.M., Ghaly, A.E., Hamdullahpur, F. and Ugursal, V.I. (2000) Mathematical Modeling of a Fluidized Bed Rice Husk Gasifier: Part I-Model Development. Energy Sources, 22, 83-98. https://doi.org/10.1080/00908310050014243
[4]  Rui, X., Zhang, M., Jin, B., Huang, Y. and Zhou, H. (2006) High-Temperature Air/Steam-Blown Gasification of Coal in a Pressurized Spout-Fluid Bed. Energy & Fuels, 20, 715-720. https://doi.org/10.1021/ef050233h
[5]  Li, Y., Ma, B., Hu, J. and Zhao, K. (2009) Numer-ical Simulation of the Hydrodynamics of Gas/Solid Two-Phase Flow in a Circulating Fluidized Bed with Different Inlet Configurations. Chemical Engineering & Technology, 32, 964-970. https://doi.org/10.1002/ceat.200800455
[6]  Toomey, R. and Johnstone, H.F. (1952) Gas Fluidization of Solid Particles. Chemical Engineering Progress, 48, 220-226.
[7]  Galgano, A., Salatino, P., Crescitelli, S., Scala, F. and Maffettone, P. (2005) A Model of the Dynamics of a Fluidized Bed Combustor Burning Biomass. Combustion and Flame, 140, 371-384. https://doi.org/10.1016/j.combustflame.2004.12.006
[8]  Borodulya, V.A., Didalenko, V.I., Palchonok, G.I. and Stanchitis, L.K. (1995) Fluidized Bed Combustion of Solid Organic Wastes and Low-Grade Coals: Research and Modeling. Proceedings of the 13th International Conference of Fluidized Bed Combustion, Orlando, 7-10 May 1995, 935-942.
[9]  Patankar, S.V. (1980) Numerical Heat Transfer and Fluid Flow. Taylor & Francis Publishers, New York.
[10]  Yu, L., Lu, J., Zhang, X. and Zhang, S. (2007) Numerical Simulation of the Bubbling Fluidized Bed Coal Gasification by the Kinetic Theory of Granular Flow (KTGF). Fuel, 86, 722-734. https://doi.org/10.1016/j.fuel.2006.09.008
[11]  Peng, B., Zhu, J. and Zhang, C. (2011) A New Approach to Specify the Inlet Boundary Conditions for Computational Fluid Dynamics (CFD) Modeling of Hydrodynamic Behavior of a Circulating Fluidized Bed (CFB) Riser. Industrial & Engineering Chemistry Research, 51, 2152-2165. https://doi.org/10.1021/ie200916c
[12]  Gerber, S., Behrendt, F. and Oevermann, M. (2010) An Eulerian Modeling Approach of Wood Gasification in a Bubbling Fluidized Bed Reactor Using Char as Bed Material. Fuel, 89, 2903-2917. https://doi.org/10.1016/j.fuel.2010.03.034
[13]  Zhou, M., Yan, L., Guo, Q. and Zhu, Q. (2006) Non-Premixed Combustion Model of Fluidized Bed Biomass Gasifier for Hydrogen-Rich Gas. Chinese Journal of Chemical Physics, 1, 131-136. https://doi.org/10.1360/cjcp2006.19(2).131.6
[14]  Gidaspow, D. (1994) Multiphase Flow and Fluidization: Continuum and Kinetic Theory Descriptions. Academic Press, New York.
[15]  Ramirez, J.J., Martinez, J.D. and Petro, S.L. (2007) Basic Design of a Fluidized Bed Gasifier for Rice Husk on a Pilot Scale. Latin American Applied Research, 37, 299-306.

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