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Received December 4, 2014
Accepted June 16, 2015
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Hydrodynamic characteristics of bubbles in bubbling fluidized bed with internals
School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan, Suwon, Gyeonggi-do 440-746, Korea 1Hanwha Chemical R&D Center, Korea
dhlee@skku.edu
Korean Journal of Chemical Engineering, September 2015, 32(9), 1938-1944(7), 10.1007/s11814-015-0131-x
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Abstract
The hydrodynamic characteristics of bubbles in bubbling fluidized beds with internals were investigated. The signal range of the optical fiber probe was calibrated from 0.5 V (the bubble phase) to 4.5 V (the emulsion phase). Data sampling involved an optical probe at a rate of 903Hz for 725 s. To obtain improved bubble data, the data were analyzed by three processes: threshold determination, bubble analysis, and erroneous bubble elimination. The data on the bubble rise velocity and bubble frequency were measured and compared to the bed height (0.2-0.7 m), superficial gas velocity (4-7 Umf), radial position r/R (0.22-0.95), number of distributor nozzles (2, 3, and 7), and the use of the internals with different hydraulic diameters of 0.19, 0.17, and 0.15 m. The experimental data were compared with several reported empirical correlations. Both the bubble rise velocity and bubble frequency increased with decreasing number of distributor nozzles. Furthermore, in the presence of internals, the bubble rise velocity decreased, whereas the bubble frequency increased with decreasing hydraulic diameter of the cross-sectional area divided by internals. Moreover, bubble breaking occurred at a specific position of r/R=0.7, not at the edge of the internals.
References
Han JH, News Inf. Chem. Eng., 31, 313 (2013)
Glicksman LR, Lord WK, Sakagami M, Chem. Eng. Sci., 42, 479 (1987)
Jin Y, Wei F, Wang Y, Effect of Internal Tubes and Baffles, Handbook of Fluidization and Fluid-Particle Systems, Ed. by Yang, W. C., Marcel Dekker, Inc., New York (2003).
Jiang P, Bi HT, Jean RH, Fan LS, AIChE J., 37, 1392 (1991)
Zheng CG, Tung YK, Xia YS, Hun B, Kwauk M, Voidage redistribution by ring internals in fast fluidizationm, Fluidization ’91, 168 (1991).
Zheng CG, Tung YK, Li HZ, Kwauk M, Characteristics of fast fluidized beds with internals, Fluidization VII, 275 (1992).
Zhu JX, Salah M, Zhou YM, J. Chem. Eng. Jpn., 30(5), 928 (1997)
Karri SBR, PSRI Research Report No. 60 (1990).
Karri SBR, Grid Design Chapter, PSRI Design Manual (1991).
Lim JH, Lee Y, Shin JH, Bae K, Han JH, Lee DH, Powder Technol., 266, 312 (2014)
Knowlton T, Karri R, Cocco R, PSRI Fluidization Seminar and Workshop, Particulate Solid Research Inc. (2011).
Wen CY, Deole NR, Chen LH, Powder Technol., 31, 175 (1982)
Schweitzer JH, Bayle J, Gauthier T, Chem. Eng. Sci., 56(3), 1103 (2001)
Zhang J, Bubble columns and three-phase fluidized beds: Flow regimes and bubble characteristics, Ph. D. Thesis, The University of British Columbia (1996).
Sobrino C, Almendros-Ibanez JA, Santana D, Vazquez C, de Vega M, Chem. Eng. Sci., 64(10), 2307 (2009)
Karimipour S, Pugsley T, Powder Technol., 205(1-3), 1 (2011)
Davidson JF, Harrison D, Fluidized particles, Cambridge University Press, London (1963).
Darton RC, La Naueza RD, Davidson JF, Harrison D, Trans. Inst. Chem. Eng., 55, 274 (1977)
Mori S, Wen CY, AIChE J., 21, 109 (1975)
Cai P, Schiavetti M, Demichele G, Grazzini GC, Miccio M, Powder Technol., 80(2), 99 (1994)
Glicksman LR, Lord WK, Sakagami M, Chem. Eng. Sci., 42, 479 (1987)
Jin Y, Wei F, Wang Y, Effect of Internal Tubes and Baffles, Handbook of Fluidization and Fluid-Particle Systems, Ed. by Yang, W. C., Marcel Dekker, Inc., New York (2003).
Jiang P, Bi HT, Jean RH, Fan LS, AIChE J., 37, 1392 (1991)
Zheng CG, Tung YK, Xia YS, Hun B, Kwauk M, Voidage redistribution by ring internals in fast fluidizationm, Fluidization ’91, 168 (1991).
Zheng CG, Tung YK, Li HZ, Kwauk M, Characteristics of fast fluidized beds with internals, Fluidization VII, 275 (1992).
Zhu JX, Salah M, Zhou YM, J. Chem. Eng. Jpn., 30(5), 928 (1997)
Karri SBR, PSRI Research Report No. 60 (1990).
Karri SBR, Grid Design Chapter, PSRI Design Manual (1991).
Lim JH, Lee Y, Shin JH, Bae K, Han JH, Lee DH, Powder Technol., 266, 312 (2014)
Knowlton T, Karri R, Cocco R, PSRI Fluidization Seminar and Workshop, Particulate Solid Research Inc. (2011).
Wen CY, Deole NR, Chen LH, Powder Technol., 31, 175 (1982)
Schweitzer JH, Bayle J, Gauthier T, Chem. Eng. Sci., 56(3), 1103 (2001)
Zhang J, Bubble columns and three-phase fluidized beds: Flow regimes and bubble characteristics, Ph. D. Thesis, The University of British Columbia (1996).
Sobrino C, Almendros-Ibanez JA, Santana D, Vazquez C, de Vega M, Chem. Eng. Sci., 64(10), 2307 (2009)
Karimipour S, Pugsley T, Powder Technol., 205(1-3), 1 (2011)
Davidson JF, Harrison D, Fluidized particles, Cambridge University Press, London (1963).
Darton RC, La Naueza RD, Davidson JF, Harrison D, Trans. Inst. Chem. Eng., 55, 274 (1977)
Mori S, Wen CY, AIChE J., 21, 109 (1975)
Cai P, Schiavetti M, Demichele G, Grazzini GC, Miccio M, Powder Technol., 80(2), 99 (1994)
