Browse > Article
http://dx.doi.org/10.9713/kcer.2020.58.2.307

Fluidization Characteristics in Fluidized Bed Reactors Operated in Subatmospheric Pressure  

Park, Sounghee (Department of Energy Engineering, Woosuk University)
Publication Information
Korean Chemical Engineering Research / v.58, no.2, 2020 , pp. 307-312 More about this Journal
Abstract
Fluidized bed reactors operated in subatmospheric pressure has been focused because several industrial applications such as vacuum drying and plasma cvd requires reduced pressure fludization. However, the hydrodynamics of fluidized beds in subatmospheric pressure has not been extensively investigated. The pressure drop in the fluidized bed has been measured with variation of downstream pressures from 1.33 to 101.3 kPa in the shallow and deep fluidized beds under the sub-atmospheric pressures. The obtained minimum fluidization velocity of powders is a function of pressure due to the changes of gas density and mean free path. We can experimentally determine the critical Knudsen number and the critical pressure to define the slip regime significantly to influence the hydrodynamics of fluidized beds.
Keywords
Fluidized Bed; Subatmospheric; Vacuum; Minimum Fluidization Velocity; Slip Flow;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Kunii, D. and Levenspiel, O., Fludization Engineering, 2nd ed., Elsevier Inc., New York, NY(1991).
2 Chitester, D. C., Kornosky, R. M., Fan, L. S. and Danko, J. P., "Characteristics of Fluidization at High Pressure," Chemical Engineering Science, 39(2), 253-261(1984).   DOI
3 Kozanoglu, B. U., Vichez, J. A., Casal, J. and Arnaldos, J., "Drying of Solids in Vacuum Fluidized Bed," The Canadian J. of Chem. Eng., 80(3), 376-385(2002).   DOI
4 Weerasiri, L. D., Das, S., Fabijanic, D. and Yang, W., "Numerical Study of Bubbling Fluidized Beds Operating at Sub-atmospheric Conditions," International Scholarly and Science Research & Innovation, 13, 656-660(2019).
5 Rogers, T. and Morin, T. J., "Slip Flow in Fixed and Fludized Bed Plasma Reactors," Plasma Chemistry and Plasma Processing, 11, 203-228(1991).   DOI
6 Park, S. H. and Kim, S. D., "Plasma Surface Treatment of HDPE Powder in a Fluidized Bed Reactor," Polym. Bull., 33, 249-256 (1994).   DOI
7 Park, S. H. and Kim, S. D., "Oxygen Plasma Surface Treatment of Polymer Powder in a Fluidized Bed Reactor," Colloid Surface A., 133, 33-39(1998).   DOI
8 Song, L. H., Park, S. H., Jung, S. H., Kim, S. D. and Park, S. B., "Synthesis of Polyethylene Glycol-polystyrene Core-shell Structure Particles in a Plasma-fluidized Bed Reactor," Korean J. Chem. Eng., 28(2), 627-632(2011).   DOI
9 Kawamura, S. and Suezawa, Y., "Mechanism of Gas Flow in a Fluidized Bed at Low Pressure," Kagaku Kogaku, 25, 524-530(1961).   DOI
10 Germain, B. and Claudel, B., "Fluidization of Mean Pressures Less Than 30 Torr," Powder Technology, 13, 115-121(1975).   DOI
11 Fletcher, J. V., Deo, M. D. and Hanson, F. V., "Fluidization of a Multi-sized Group B Sand At Reduced Pressure," Powder Technology, 76, 141-147(1993).   DOI
12 Roth, A., "Vacuum Technology," North-Holland, Amsterdam (1976).
13 Kusakabe, S., Kuriyama, T. and Morooka, S., "Fluidization of Fine Particles at Reduced Pressure," Powder Technology, 58, 125-130(1989).   DOI
14 Llop, M. F., Madrid, F., Arnaldos, J. and Casal J., "Fluidization at Vacuum Conditions. A Generalized Equation for the Prediction for the Prediction of Minimum Fluidization Velocity," Chemical Engineering Science, 51, 5149-5157(1996).   DOI
15 Zarekar, S., Buck, A., Jacob, M. and Tsotsas, E., "Reconsideration of the Hydrodynamic Behavior of Fluidized Beds Operated Under Reduced Pressure," Powder Technology, 287, 169-176 (2016).   DOI
16 Kozanoglu, B. U., Welti Chanes, J., Garcia Cuautle, D., Sants Jean, J. P., "Hydrodynamics of Large Partilce Fluidization in Reduced Pressure Operations: An Experimental Study," Powder Technology, 125, 55-60(2002).   DOI
17 Wraith, A. E. and Harris, R., "Fluidisation of a Mineral Concentrate at Reduced Pressure," Minerals Engineering, 5, 993-1002 (1992).   DOI