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Received March 11, 2014
Accepted April 19, 2014
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Holdup and Flow Behavior of Fluidized Solid Particles in a Liquid-Solid Circulating Fluidized Bed
Department of Chemical Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, Korea
Korean Chemical Engineering Research, June 2014, 52(3), 371-377(7), 10.9713/kcer.2014.52.3.371 Epub 2 June 2014
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Abstract
Characteristics of holdup and flow behavior of fluidized solid particles were investigated in a liquid-solid circulating fluidized bed (0.102 m × 3.5 m). Effects of liquid velocity (UL), particle size (dP) and solid circulation rate (GS) on the solid holdup, overall particle rising velocity, slip velocity between liquid and particles and hydrodynamic energy dissipation rate in the riser were examined. The particle holdup increased with increasing dP or GS but decreased with increasing UL. The overall particle rising velocity increased with increasing UL or GS but decreased with increasing dP. The slip velocity increased with increasing UL or dP but did not change considerably with GS. The energy dissipation rate, which was found to be closely related to the contacting frequency of micro eddies, increased with increasing dP, GS or UL. The solid particle holdup was well correlated with operating variables such as UL, dP and GS.
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References
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Kim SD, Kang Y, Surf. Sci. Catal., 159, 103 (2006)
Kang Y, Lee IK, Shin IS, Son SM, Kim SD, Jung H, Korean Chem. Eng. Res., 46(3), 451 (2008)
Atta A, Razzak SA, Nigam KDP, Zhu JX, Ind. Eng. Chem. Res., 48(17), 7876 (2009)
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Anspach FB, Petsch D, Deckwer WD, Can. J. Chem. Eng., 77(5), 921 (1999)
Zheng Y, Zhu JX, Powder Technol., 114(1-3), 244 (2001)
Shin KS, Song PS, Lee CG, Kang SH, Kang Y, Kim SD, Kim SJ, AIChE J., 51(2), 671 (2005)
Cho YJ, Song PS, Lee CG, Kang Y, Kim SD, Fan LT, Chem. Eng. Commun., 192(3), 257 (2005)
Patel A, Zhu J, Nakhla G, Chemosphere., 65, 1103 (2006)
Trivedi U, Bassi A, Zhu JX, Powder Technol., 169(2), 61 (2006)
Patel M, Bassi AS, Zhu JJA, Gomaa H, Biotechnol. Prog., 24(4), 821 (2008)
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Lim DH, Park JH, Kang Y, Jun KW, Fuel Processing Technol., 108, 2 (2013)
Jin HR, Lim DH, Lim H, Kang Y, Jung H, Kim SD, Ind. Eng. Chem. Res., 51(4), 2062 (2012)
Jin HR, Song YH, Kang Y, Jung H, Lee HT, Korean Chem. Eng. Res., 49(1), 83 (2011)
Jin HR, Lim H, Lim DH, Kang Y, Jun KW, Chin. J. Chem. Eng., 21(8), 844 (2013)
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Deckwer WD, Chem. Eng. Sci., 35, 1341 (1980)
Hinze JO, Turbulence, McGraw-Hill, New York (1958)
