THE EFFECT OF REACTOR HEIGHT ON COAL GASIFICATION

Main Article Content

Cem DOLU Lütfullah KUDDUSİ

Abstract

A comprehensive two-dimensional numerical model has been developed to simulate the coal gasification and investigate the effect of reactor height on the coal gasification in fluidized bed. Gas-solid flow, homogeneous and heterogeneous chemical reactions were considered. An Eulerian model for fluid phase and discrete particle method (Lagrangian) for particle phase were used in this study. The reaction rates of homogeneous and heterogeneous reactions were determined by Arrhenius-Eddy dissipation reaction rate and Arrhenius-diffusion rate, respectively. Simulations were performed in a fluidized bed coal gasifier with 12 different reactor heights and with a diameter of 0.22 m. The calculated values were compared with the experimental values for the reactor height of 2 meters available in open literature. It shows that the predicted exit gas mole fractions are in a good agreement with the experimental data.

Article Details

How to Cite
DOLU, Cem; KUDDUSİ, Lütfullah. THE EFFECT OF REACTOR HEIGHT ON COAL GASIFICATION. Thermal Science, [S.l.], mar. 2017. ISSN 2334-7163. Available at: <http://thermal-science.tech/journal/index.php/thsci/article/view/2138>. Date accessed: 24 june 2017. doi: https://doi.org/10.2298/TSCI150526112D.
Section
Articles
Received 2017-03-02
Accepted 2017-03-13
Published 2017-03-13

References

[1] Gomez-Barea A., Leckner B., Modeling of Biomass Gasification in Fluidized Bed, Progress in Energy and Combustion Science, 36 (2010), 4, pp. 444-509
[2] Gidaspow D. Multiphase Flow and Fluidization: Continuum and Kinetic Theory Description, Academic Press, San Diego, USA, 1994
[3] Wachem B.V., et al., Eulerian Simulations of Bubling Behavior in Gas-Solid Fluidised Beds, Computer & Chemical Engineering, 22, (1998), pp. 299-306
[4] Benyahia, S., et al., Simulation of Particles and Gas Flow Behavior in the Riser Section of a Circulating Fluidized Bed Using the Kinetic Theory Approach for the Particulate Phase, Powder Technology, 112, (2000), pp. 24-33
[5] Zhong, W., et al., Flow Behaviors of a Large Spout-Fluid Bed at High Pressure and Temperature by 3D Simulation with Kinetic Theory of Granular Flow, Powder Technology, 175, (2007), pp. 90-103
[6] Wang, X., et al., Three-Dimensional Simulation of Fluidized Bed Coal Gasification, Chemical Engineering and Processing, 48, (2009), 2, pp. 695-705
[7] Tsuji, Y., et al., Discrete Particle Simulation of Two Dimensional Fluidized Bed, Powder Technology, 77, (1993), 1, pp. 79-87
[8] Grabner, M., et al., Numerical Simulation of Coal Gasification at Circulating Fluidised Bed Conditions, Fuel Processing Technology, 88, (2007), 10, pp. 948-958
[9] Chejne, F., Hernandez, J.P., Modelling and Simulation of Coal Gasification Process in Fluidised Bed, Fuel, 81, (2002), pp. 1687-1702
[10] Andrews, M., O'Rourke, P., The Multiple Particle-in-Cel (MP-PIC) Method for Dense Particle Flow, Internetional Journal Multiphase Flow, 22, (1996), pp. 379-402
[11] Hassan, P., Warn-Gyu, P., Numerical Investigation on Cooling Performance of Ranque-Hilsch Vortex Tube, Thermal Science, 18, (1972), 4, pp. 1173-1189
[12] Tomeczek, J., Coal Combustion, Krieger Publishing Company, Malabar FL USA, 1994
[13] FLUENT Inc., FLUENT 6.3.26 User Guide, Fluent Inc., Centerra Resource Park, 10 Cavendish Court, Lebanon, NH 03766, 2005
[14] Silaen, A., Wang, T., Effect of Turbulence and Devolatilization Models on Gasification Simulation, International Journal Heat Mass Transfer, 53, (2010), pp. 2074-2091
[15] Kobayashi, H., et al., Coal Devolatilization at High Temperatures, Synposium (International) on Combustion, 16, (1977), 1, pp. 411-425
[16] Magnussen, B., Hjertager, B., On mathematical models of turbulent combustion with special emphasis on soot formation and combustion. 16th Symp. (Int'l) on Combustion, 16, (1977), 1, pp. 719-729
[17] Jones, W., Lindstedt, R., Global Reaction Schemes for Hydrocarbon Combustion, Combustion and Flame, 73, (1998), 3, pp. 233-249
[18] Westbrook, C., Dryer, F., Simplified Reaction Mechanism for the Oxidation of Hydrocarbon in Flames, Combustion Science and Technology, 27, (1981), 1-2, pp. 31-43
[19] Chen, C., et al., Numerical Simulation of Entrained Flow Coal Gasifiers, Chemical Engineering Science, 55, (2000), pp. 3861-3883
[20] Chen, H., Integrated Analyses of Biomass Gasification in Fluidized Beds, Ph. D. thesis, The University of Western Ontario, Ontario, Canada, 2007
[21] Yu, L., et al., Numerical Simulation of the Bubbling Fluidized Bed Coal Gasification by the Kinetic Theory of Granular Flow (KTGF), Fuel, 86, (2007), pp. 722-734