Application of New Inflection Point Method for Hydrodynamics Study in Slurry Bubble Column Reactors

Document Type : Research Article

Authors

1 Institute of Environmental Engineering, Advanced Technologies and Sustainable Development, Faculty of Chemical Engineering, Sahand University of Technology, P.O. Box. 51335 1996 Tabriz, I.R. IRAN

2 Department of Chemical Engineering, Faculty of Chemistry, Tabriz University, Tabriz, I.R. IRAN

Abstract

Bubble column reactors are used in a wide variety of applications such as multiphase bioreactors, catalytic slurry reactors, and absorption processes. The superficial gas velocity-gas holdup relationship and transition point are two important parameters for characterizing the hydrodynamics of a bubble column reactor. In this study, systematic investigation of a nitrogen - water - glass beads bubble column was conducted using the Taguchi experimental design method. The L16 (45) orthogonal array was selected for experiments design. Results showed that the order of importance of parameters is as follows: bed porosity, the ratio of height to diameter, and superficial gas velocity. A novel mathematical model was developed using the experimental data and based on 4th order polynomial. This model was successfully used to obtain the transition point with a high accuracy. The results of the mathematical method were in close agreement with those of the drift flux method. For liquid level of H=12D and slurry content of 13 vol%, transition velocity of  2.98 cm/s was calculated using the presented method, while a velocity of 3.14 cm/s  was obtained from the drift flux method.  

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[1] Deckwer W.D., Schumpe A., Improved Tools for Bubble Column Reactor Design and Scale-Up, Chemical Engineering Science, 48(5), p.889 (1993).
[2] Koide K., Design Parameters of Bubble-Column Reactors with and without Solid Suspensions, Journal of Chemical Engineering of Japan, 29(5), p.745 (1996).
[3] Nikakhtari H., Gordon A. Hill, Hydrodynamic and Oxygen Mass Transfer in an External Loop Airlift Bioreactor with a Packed Bed, Biochemical Engineering Journal, 27, p.138 (2005).
[4] Yazdian F., Shojaosadati S.A., Nosrati M., Mehrnia M.R., Comparison of Different Bioreactors  Based on  Hydrodynamic Characteristics, Mass Transfer, Energy Consumption and Biomass Production from Natural Gas, Iranian Journal of Chemistry and Chemical Engineering (IJCCE), 29(4),p.37(2011).
[5] Richardson J.F., Zaki W.N., Sedimentation and Fluidization, Part I, Trans. Instn. Chem. Engrs., 32, p. 35 (1954).
[6] Zuber N., Findlay J.A., Average Volumetric Concentration in Two-Phase Flow Systems. Journal of Heat Transfer, ASME 87, p.453 (1965).
[7] Camarasa E., Vial C., Poncin S., Wild G., Midoux N., Bouillard J., Influence of Coalescence Behavior of the Liquid and of Gas Sparging on Hydrodynamics and Bubble Characteristics in a Bubble Column, Chemical Engineering and Processing, 38, p. 329 (1999).
[8] Wallis G.B., “One-Dimensional Two- Phase Flow”, McGraw-Hill, New York. (1969).
[9] Deckwer W.D., “Bubble Column Reactors, Wiley”, Chichester. (1992).
[10] Shah Y.T., Kelkar B.G., Godbole S.P., Deckwer W.D., Design Parameters Estimations for Bubble Column Reactors, A.I.Ch.E Journal, 28, p.353 (1982).
[11] Moshtari B., Ganji Babakhani E., Moghaddas J. S., Experimental Study of Gas Holdup and Bubble Behavior in Gas -Liquid Bubble Column, Petroleum & Coal, 51 (1), p.27 (2009).
[12] Ivana M. Šijački, Radmilo R. Čolović, Milenko S. Tokić, Predrag S. Kojić., Simple Correlatiuons for Bubble Column and Draft Tube Airlift Reactors with Dilute Alcohol Solutions, APTEFF, 40, p.183 (2009).
[13] Madaeni S.S., Koocheki S., Application of Taguchi Method in the Optimization of Wastewater Treatment Using Spiral-Wound Reverse Osmosis Element, Chemical Engineering Journal, 119, p.37 (2006).
[14] Fengshan L., Haiying S., Tao G., Nianmin Q., Application of Taguchi’s Method in the Optimization of Bridging Efficiency Between Confluent and Fresh Microcarriers in Bead-to-Bead Transfer of Vero Cells, Biotechnol Lett, 30, p.645 (2008).
[15] Rossella S., Luigi A.,Antonio D., Giancarlo B., Application of Taguchi Method for the Multi-Objective Optimization of Aluminium Foam Manufacturing Parameters, Int J Mater Form., 3, p.1 (2010).
[16] Zeinali E., “Design of Experiment With Taguchi Method Using Qualitek Software”, 1st ed., Petrochemiacal Research & Development Company Publishing, Iran. (2008).
[17] Kara S., Balmohan G., Shah Y.T., Carr N.L., Hydrodynamics and Axial Mixing in a Three-Phase Bubble Column, Industrial Engineering Chemistry Process Design and Development, 21, p.584 (1982).
[18] Koide K., Takazawa A., Komura M., Matsunaga H., Gas Holdup and Volumetric Liquid-Phase Mass Transfer Coefficient in Solid-Suspended Bubble Columns, Journal of Chemical Engineering of Japan, 17, p.459 (1984).
[19] Kojima H., Anjyo H., Mochizuki Y., Axial Mixing in Bubble Column with Suspended Solid Particles, Journal of Chemical Engineering of Japan, 19, p. 232 (1986).
[20] de Swart J.W.A., Krishna R., Influence of Particles Concentration on the Hydrodynamic of Bubble Column Slurry Reactors, Chemical Engineering Research and Design, 73, p. 308 (1995).
[21] Schumpe A., Saxena A.K., Fang L.K., Gas/Liquid Mass Transfer in a Slurry Bubble Column, Chemical Engineering Science, 42, p.1787 (1987).
[22] Clark K.N., The Effect of High Pressure and Temperature on Phase Distributions in a Bubble Column, Chemical Engineering Science, 45, p.2301 (1990).
[23] Luo X., Lee D.J., Lau R., Yang G., Fan L.S., Maximum Stable Bubble Size and Gas Holdup in High-Pressure Slurry Bubble Columns, A.I.Ch.E. Journal, 45, p. 665 (1999).
[24] Wilkinson P.M., Spek A.P., van Dierendonck L.L., Design Parameters Estimation for Scale up of High Pressure Bubble Columns, A.I.Ch.E Journal, 38, p. 544 (1992).
[25] Pino L.Z., Solari R.B., Siquier S., Antonio Estevez L., Yepez M.M., Effect of Operating Conditions on Gas Holdup in Slurry Bubble Columns with a Foaming Liquid, Chemical Engineering Communication, 117, p. 367 (1992).
[26] Ruzicka M.C., Drahos J., Fialova M., Thomas N.H., Effect of Bubble Column Ddimensions on Flow Regime Transition, Chemical Engineering Science, 56, p. 6117 (2001).
[27] M.Y.Chisti , M.Moo-Young, Gas Holdup in Pneumatic Reactors, Chemical Engineering Journal, 38, p.149 (1988).
[28] Krishna R., Wilkinson P.M., van Dierendonck L.L., A Model for Gas Holdup in Bubble Columns Incorporating the Influence of Gas Density on Flow Regime Transitions, Chemical Engineering Science, 46(10), p.2491 (1991).
[29] C.O. Vandu,K. Koop, R. Krishna, Volumetric Mass Transfer Coefficient in a Slurry Bubble Column Operating in the Heterogeneous Flow Regime, Chemical Engineering Science, 59, p.5417 (2004).
[30] Letzel H.M., Schouten J.C., Krishna R., van den Bleek C.M., Characterization of Regimes and Regime Transitions in Bubble Columns by Chaos Analysis of Pressure Signals, Chemical Engineering Science, 52 (24), p. 4447 (1997).
[31] Parasu Veera U., Joshi J.B., Measurement of Gas Hold-Up Profiles in Bubble Column by Gamma Ray Tomography: Effect of Liquid Phase Properties, Trans IChemE, 78, Part A, (2000).
[32] Mena P.C., Ruzicka M.C., Rocha F.A., Teixeira J.A., Drahoš J., Effect of Solids on Homogeneous-Heterogeneous Flow Regime Transition in Bubble Columns, Chemical Engineering Science, 60, p.6013 (2005).