Influence of high density particles in reduction of axial dispersion in liquid fluidized bed with residence time distribution curve studies

Jamshid Behin; Tahereh Shojaeimehr

Korean Journal of Chemical Engineering, Vol.28, No.3, 980-986, March, 2011

DOI10.1007/s11814-010-0451-9 Export Citation

Influence of high density particles in reduction of axial dispersion in liquid fluidized bed with residence time distribution curve studies

Jamshid Behin^†, and Tahereh Shojaeimehr

Department of Chemical Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran

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Liquid phase RTD curves were investigated in classical fixed and fluidized bed regimes with high density particles. The effect of liquid velocity was studied on bed hydrodynamics. Using an impulse tracer injection technique in a column of 5 cm inner diameter and 1.2 m height, liquid RTD, mean residence time (MRT), axial dispersion coefficient (ADC) and vessel dispersion number (ND) were determined. ADC increases with liquid superficial velocity. It varied from 4.63 to 20.7 cm2/s for the particle Reynolds number of 43 to 279, respectively. The experimental results show that the hight density particles cause less ADC than the low density particles at an identical Reynolds number.

Keywords:Axial Dispersion Coefficient;Hydrodynamics;Liquid-solid Fluidized Bed;Residence Time Distribution

[References]

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[1] van Wachem BGM, Almstedt AE, Chem. Eng. J., 96(1-3), 81 (2003)

[2] Aghajani M, Muller-Steinhagen H, Jamialahmadi M, Int. J. Heat Mass Transf., 48(2), 317 (2005)

[3] Limtrakul S, Chen JW, Ramachandran PA, Dudukovic MP, Chem. Eng. Sci., 60(7), 1889 (2005)

[4] Lee DH, Korean J. Chem. Eng., 18(3), 347 (2001)

[5] Jin GD, Liu DY, Powder Technol., 154(2-3), 138 (2005)

[6] Renganathan T, Krishnaiah K, Chem. Eng. J., 98(3), 213 (2004)

[7] Asif M, Kalogerakis N, Behie L, Chem. Eng. Sci., 47, 4155 (1992)

[8] Tang WT, Fan LS, Chem. Eng. Sci., 45, 543 (1990)

[9] Chung SF, Wen CY, AIChE J., 14, 847 (1968)

[10] Kikuchi KI, Konno H, Kakutani S, Sugawara T, Ohashi H, J. Chem. Eng. Japan., 19, 362 (1984)

[11] Tang WT, Fan LS, AIChE J., 35, 355 (1989)

[12] Levenspiel O, Chem. React. Eng., 3rd Ed., John Wiley & Sons, New York, 668 (1999)

[13] Levenspiel O, Smith WK, Chem. Eng. Sci., 6, 227 (1957)

[14] Kunii D, Levenspiel O, Fluidization Eng., 2nd Ed., Butterworth-Heinemann, Boston, 491 (1991)

[15] Streeter VL, Wylie EB, Bedford KW, Fluid mechanics., 9th Ed. McGraw-Hill, New York, 740 (1998)

[16] van Zessen E, Hydrodynamics of liquid-liquid-solid fluidized bed bioreactor, Ph.D Thesis, Wageningen University, Netherland, 200 (2003)

[17] Jena HM, Roy GK, Meikap BC, Powder Technol., 196(3), 246 (2009)

[18] Kim SJ, Jeung SY, Moon H, Korean J. Chem. Eng., 15(6), 637 (1998)

[19] Richardson JF, Zaki WN, Trans. Inst. Chem. Eng., 32, 35 (1954)

[20] Cho HI, Chung CH, Han GY, Ahn GR, Kong JS, Korean J. Chem. Eng., 17(3), 292 (2000)

[21] Kim J, Han G, Yi C, Korean J. Chem. Eng., 19(3), 491 (2002)

[22] Krishnaswamy PR, Shemilt LW, Can. J. Chem. Eng., 51, 680 (1973)